An experimental share extension to send files and too much refactoring

closes #4

NearDrop.xcodeproj/project.pbxproj

@@ -7,26 +7,63 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		698DFAE629E2F91A0064F247 /* NearbyConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 698DFAE529E2F91A0064F247 /* NearbyConnection.swift */; };
+		691F53BB2ABB70840089FD92 /* DeviceListCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 691F53B92ABB70840089FD92 /* DeviceListCell.swift */; };
+		691F53BC2ABB70840089FD92 /* DeviceListCell.xib in Resources */ = {isa = PBXBuildFile; fileRef = 691F53BA2ABB70840089FD92 /* DeviceListCell.xib */; };
+		691F53BE2ABF03820089FD92 /* OutboundNearbyConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 691F53BD2ABF03820089FD92 /* OutboundNearbyConnection.swift */; };
+		691F53C72AC2594E0089FD92 /* Localizable.strings in Resources */ = {isa = PBXBuildFile; fileRef = 691F53C52AC2594E0089FD92 /* Localizable.strings */; };
+		691F53CB2AC2599B0089FD92 /* Localizable.stringsdict in Resources */ = {isa = PBXBuildFile; fileRef = 691F53C92AC2599B0089FD92 /* Localizable.stringsdict */; };
 		698DFB0329E362140064F247 /* NDNotificationCenterHackery.m in Sources */ = {isa = PBXBuildFile; fileRef = 698DFB0229E362140064F247 /* NDNotificationCenterHackery.m */; };
+		699B03452AB5FBA300E0D718 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 699B03442AB5FBA300E0D718 /* Assets.xcassets */; };
+		699DEBA62AB0573200115D22 /* ShareViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 699DEBA52AB0573200115D22 /* ShareViewController.swift */; };
+		699DEBA92AB0573200115D22 /* ShareViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 699DEBA72AB0573200115D22 /* ShareViewController.xib */; };
+		699DEBAE2AB0573200115D22 /* ShareExtension.appex in Embed Foundation Extensions */ = {isa = PBXBuildFile; fileRef = 699DEBA12AB0573200115D22 /* ShareExtension.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
 		69D2C32D29E77F2200EC7E30 /* Localizable.strings in Resources */ = {isa = PBXBuildFile; fileRef = 69D2C32B29E77F2200EC7E30 /* Localizable.strings */; };
 		69D2C32F29E7898C00EC7E30 /* MainMenu.xib in Resources */ = {isa = PBXBuildFile; fileRef = 69D2C32E29E7898C00EC7E30 /* MainMenu.xib */; };
 		69D2C33829E78DF400EC7E30 /* Localizable.stringsdict in Resources */ = {isa = PBXBuildFile; fileRef = 69D2C33629E78DF400EC7E30 /* Localizable.stringsdict */; };
 		69DA9A1229E0BF5100A442DA /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A1129E0BF5100A442DA /* AppDelegate.swift */; };
 		69DA9A1429E0BF5200A442DA /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 69DA9A1329E0BF5200A442DA /* Assets.xcassets */; };
-		69DA9A1F29E0C0B300A442DA /* NearbyConnectionManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A1E29E0C0B300A442DA /* NearbyConnectionManager.swift */; };
+		69DCF48A2AB70E8C00CBE2CC /* wire_format.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2929E18CB500A442DA /* wire_format.pb.swift */; };
-		69DA9A2129E0CC4E00A442DA /* Data+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2029E0CC4E00A442DA /* Data+Extensions.swift */; };
+		69DCF48B2AB70E8C00CBE2CC /* ukey.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2829E18CB500A442DA /* ukey.pb.swift */; };
-		69DA9A2329E17F0400A442DA /* InboundNearbyConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2229E17F0400A442DA /* InboundNearbyConnection.swift */; };
+		69DCF48C2AB70E8C00CBE2CC /* device_to_device_messages.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2A29E18CB500A442DA /* device_to_device_messages.pb.swift */; };
-		69DA9A2629E189EF00A442DA /* SwiftProtobuf in Frameworks */ = {isa = PBXBuildFile; productRef = 69DA9A2529E189EF00A442DA /* SwiftProtobuf */; };
+		69DCF48D2AB70E8C00CBE2CC /* offline_wire_formats.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2B29E18CB500A442DA /* offline_wire_formats.pb.swift */; };
-		69DA9A2E29E18CB500A442DA /* ukey.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2829E18CB500A442DA /* ukey.pb.swift */; };
+		69DCF48E2AB70E8C00CBE2CC /* securegcm.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2C29E18CB500A442DA /* securegcm.pb.swift */; };
-		69DA9A2F29E18CB500A442DA /* wire_format.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2929E18CB500A442DA /* wire_format.pb.swift */; };
+		69DCF48F2AB70E8C00CBE2CC /* securemessage.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2D29E18CB500A442DA /* securemessage.pb.swift */; };
-		69DA9A3029E18CB500A442DA /* device_to_device_messages.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2A29E18CB500A442DA /* device_to_device_messages.pb.swift */; };
+		69DCF4902AB70E9700CBE2CC /* InboundNearbyConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2229E17F0400A442DA /* InboundNearbyConnection.swift */; };
-		69DA9A3129E18CB500A442DA /* offline_wire_formats.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2B29E18CB500A442DA /* offline_wire_formats.pb.swift */; };
+		69DCF4912AB70E9700CBE2CC /* NearbyConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 698DFAE529E2F91A0064F247 /* NearbyConnection.swift */; };
-		69DA9A3229E18CB500A442DA /* securegcm.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2C29E18CB500A442DA /* securegcm.pb.swift */; };
+		69DCF4922AB70E9700CBE2CC /* NearbyConnectionManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A1E29E0C0B300A442DA /* NearbyConnectionManager.swift */; };
-		69DA9A3329E18CB500A442DA /* securemessage.pb.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2D29E18CB500A442DA /* securemessage.pb.swift */; };
+		69DCF4932AB70E9700CBE2CC /* Data+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69DA9A2029E0CC4E00A442DA /* Data+Extensions.swift */; };
-		69DA9A3629E1994C00A442DA /* SwiftECC in Frameworks */ = {isa = PBXBuildFile; productRef = 69DA9A3529E1994C00A442DA /* SwiftECC */; };
+		69DCF4942AB8BF7B00CBE2CC /* libNearbyShare.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = 69DCF4812AB70D0600CBE2CC /* libNearbyShare.dylib */; };
+		69DCF4952AB8BF7B00CBE2CC /* libNearbyShare.dylib in Embed Libraries */ = {isa = PBXBuildFile; fileRef = 69DCF4812AB70D0600CBE2CC /* libNearbyShare.dylib */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
+		69DCF49A2AB8C58500CBE2CC /* SwiftProtobuf in Frameworks */ = {isa = PBXBuildFile; productRef = 69DCF4992AB8C58500CBE2CC /* SwiftProtobuf */; };
+		69DCF49C2AB8C58500CBE2CC /* SwiftECC in Frameworks */ = {isa = PBXBuildFile; productRef = 69DCF49B2AB8C58500CBE2CC /* SwiftECC */; };
+		69DCF49D2AB8C9A500CBE2CC /* libNearbyShare.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = 69DCF4812AB70D0600CBE2CC /* libNearbyShare.dylib */; };
+		69DCF49E2AB8C9A500CBE2CC /* libNearbyShare.dylib in Embed Libraries */ = {isa = PBXBuildFile; fileRef = 69DCF4812AB70D0600CBE2CC /* libNearbyShare.dylib */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
 /* End PBXBuildFile section */
 
+/* Begin PBXContainerItemProxy section */
+		699DEBAC2AB0573200115D22 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 69DA9A0629E0BF5100A442DA /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 699DEBA02AB0573200115D22;
+			remoteInfo = ShareExtension;
+		};
+		69DCF4962AB8BF7B00CBE2CC /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 69DA9A0629E0BF5100A442DA /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 69DCF4802AB70D0600CBE2CC;
+			remoteInfo = NearbyShare;
+		};
+		69DCF49F2AB8C9A500CBE2CC /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 69DA9A0629E0BF5100A442DA /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 69DCF4802AB70D0600CBE2CC;
+			remoteInfo = NearbyShare;
+		};
+/* End PBXContainerItemProxy section */
+
 /* Begin PBXCopyFilesBuildPhase section */
 		698DFAFF29E353220064F247 /* Embed Foundation Extensions */ = {
 			isa = PBXCopyFilesBuildPhase;
@@ -34,10 +71,43 @@
 			dstPath = "";
 			dstSubfolderSpec = 13;
 			files = (
+				699DEBAE2AB0573200115D22 /* ShareExtension.appex in Embed Foundation Extensions */,
 			);
 			name = "Embed Foundation Extensions";
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		699DEBDB2AB2828400115D22 /* Embed XPC Services */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "$(CONTENTS_FOLDER_PATH)/XPCServices";
+			dstSubfolderSpec = 16;
+			files = (
+			);
+			name = "Embed XPC Services";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		69DCF4982AB8BF7B00CBE2CC /* Embed Libraries */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+				69DCF4952AB8BF7B00CBE2CC /* libNearbyShare.dylib in Embed Libraries */,
+			);
+			name = "Embed Libraries";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		69DCF4A12AB8C9A500CBE2CC /* Embed Libraries */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+				69DCF49E2AB8C9A500CBE2CC /* libNearbyShare.dylib in Embed Libraries */,
+			);
+			name = "Embed Libraries";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
@@ -45,12 +115,26 @@
 		3226184E2A51E10600B06FD1 /* de */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = de; path = de.lproj/Localizable.strings; sourceTree = "<group>"; };
 		322618502A51EB8A00B06FD1 /* es */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = es; path = es.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
 		322618512A51EB8A00B06FD1 /* es */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = es; path = es.lproj/Localizable.strings; sourceTree = "<group>"; };
+		691F53B92ABB70840089FD92 /* DeviceListCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceListCell.swift; sourceTree = "<group>"; };
+		691F53BA2ABB70840089FD92 /* DeviceListCell.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = DeviceListCell.xib; sourceTree = "<group>"; };
+		691F53BD2ABF03820089FD92 /* OutboundNearbyConnection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OutboundNearbyConnection.swift; sourceTree = "<group>"; };
+		691F53C42AC257A30089FD92 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = ru; path = ru.lproj/ShareViewController.strings; sourceTree = "<group>"; };
+		691F53C62AC2594E0089FD92 /* Base */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = Base; path = Base.lproj/Localizable.strings; sourceTree = "<group>"; };
+		691F53C82AC259630089FD92 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = ru; path = ru.lproj/Localizable.strings; sourceTree = "<group>"; };
+		691F53CA2AC2599B0089FD92 /* Base */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = Base; path = Base.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
+		691F53CC2AC259A20089FD92 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = ru; path = ru.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
 		698DFAE529E2F91A0064F247 /* NearbyConnection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NearbyConnection.swift; sourceTree = "<group>"; };
 		698DFAED29E353220064F247 /* UserNotifications.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UserNotifications.framework; path = System/Library/Frameworks/UserNotifications.framework; sourceTree = SDKROOT; };
 		698DFAEF29E353220064F247 /* UserNotificationsUI.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UserNotificationsUI.framework; path = System/Library/Frameworks/UserNotificationsUI.framework; sourceTree = SDKROOT; };
 		698DFB0029E362140064F247 /* NearDrop-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "NearDrop-Bridging-Header.h"; sourceTree = "<group>"; };
 		698DFB0129E362140064F247 /* NDNotificationCenterHackery.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = NDNotificationCenterHackery.h; sourceTree = "<group>"; };
 		698DFB0229E362140064F247 /* NDNotificationCenterHackery.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = NDNotificationCenterHackery.m; sourceTree = "<group>"; };
+		699B03442AB5FBA300E0D718 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		699DEBA12AB0573200115D22 /* ShareExtension.appex */ = {isa = PBXFileReference; explicitFileType = "wrapper.app-extension"; includeInIndex = 0; path = ShareExtension.appex; sourceTree = BUILT_PRODUCTS_DIR; };
+		699DEBA52AB0573200115D22 /* ShareViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareViewController.swift; sourceTree = "<group>"; };
+		699DEBA82AB0573200115D22 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.xib; name = Base; path = Base.lproj/ShareViewController.xib; sourceTree = "<group>"; };
+		699DEBAA2AB0573200115D22 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		699DEBAB2AB0573200115D22 /* ShareExtension.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = ShareExtension.entitlements; sourceTree = "<group>"; };
 		69D2C32C29E77F2200EC7E30 /* Base */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = Base; path = Base.lproj/Localizable.strings; sourceTree = "<group>"; };
 		69D2C32E29E7898C00EC7E30 /* MainMenu.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = MainMenu.xib; sourceTree = "<group>"; };
 		69D2C33029E789AF00EC7E30 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = ru; path = ru.lproj/Localizable.strings; sourceTree = "<group>"; };
@@ -69,6 +153,7 @@
 		69DA9A2B29E18CB500A442DA /* offline_wire_formats.pb.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = offline_wire_formats.pb.swift; sourceTree = "<group>"; };
 		69DA9A2C29E18CB500A442DA /* securegcm.pb.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = securegcm.pb.swift; sourceTree = "<group>"; };
 		69DA9A2D29E18CB500A442DA /* securemessage.pb.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = securemessage.pb.swift; sourceTree = "<group>"; };
+		69DCF4812AB70D0600CBE2CC /* libNearbyShare.dylib */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; includeInIndex = 0; path = libNearbyShare.dylib; sourceTree = BUILT_PRODUCTS_DIR; };
 		A3930F0529EAB2D1008F891D /* it */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = it; path = it.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
 		A3930F0629EAB2D1008F891D /* it */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = it; path = it.lproj/Localizable.strings; sourceTree = "<group>"; };
 		B670906E2A6D234D00DB8273 /* th */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = th; path = th.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
@@ -76,12 +161,28 @@
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
+		699DEB9E2AB0573200115D22 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				69DCF49D2AB8C9A500CBE2CC /* libNearbyShare.dylib in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		69DA9A0B29E0BF5100A442DA /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				69DA9A3629E1994C00A442DA /* SwiftECC in Frameworks */,
+				69DCF4942AB8BF7B00CBE2CC /* libNearbyShare.dylib in Frameworks */,
-				69DA9A2629E189EF00A442DA /* SwiftProtobuf in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		69DCF47F2AB70D0600CBE2CC /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				69DCF49C2AB8C58500CBE2CC /* SwiftECC in Frameworks */,
+				69DCF49A2AB8C58500CBE2CC /* SwiftProtobuf in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -97,10 +198,28 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		699DEBA22AB0573200115D22 /* ShareExtension */ = {
+			isa = PBXGroup;
+			children = (
+				699DEBA52AB0573200115D22 /* ShareViewController.swift */,
+				691F53B92ABB70840089FD92 /* DeviceListCell.swift */,
+				691F53BA2ABB70840089FD92 /* DeviceListCell.xib */,
+				699DEBA72AB0573200115D22 /* ShareViewController.xib */,
+				699B03442AB5FBA300E0D718 /* Assets.xcassets */,
+				691F53C92AC2599B0089FD92 /* Localizable.stringsdict */,
+				691F53C52AC2594E0089FD92 /* Localizable.strings */,
+				699DEBAA2AB0573200115D22 /* Info.plist */,
+				699DEBAB2AB0573200115D22 /* ShareExtension.entitlements */,
+			);
+			path = ShareExtension;
+			sourceTree = "<group>";
+		};
 		69DA9A0529E0BF5100A442DA = {
 			isa = PBXGroup;
 			children = (
 				69DA9A1029E0BF5100A442DA /* NearDrop */,
+				699DEBA22AB0573200115D22 /* ShareExtension */,
+				69DCF4822AB70D0600CBE2CC /* NearbyShare */,
 				698DFAEC29E353220064F247 /* Frameworks */,
 				69DA9A0F29E0BF5100A442DA /* Products */,
 			);
@@ -110,6 +229,8 @@
 			isa = PBXGroup;
 			children = (
 				69DA9A0E29E0BF5100A442DA /* NearDrop.app */,
+				699DEBA12AB0573200115D22 /* ShareExtension.appex */,
+				69DCF4812AB70D0600CBE2CC /* libNearbyShare.dylib */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -117,17 +238,12 @@
 		69DA9A1029E0BF5100A442DA /* NearDrop */ = {
 			isa = PBXGroup;
 			children = (
-				69DA9A2729E18CB500A442DA /* Protobuf */,
 				69DA9A1129E0BF5100A442DA /* AppDelegate.swift */,
 				69DA9A1329E0BF5200A442DA /* Assets.xcassets */,
-				69DA9A1E29E0C0B300A442DA /* NearbyConnectionManager.swift */,
 				69D2C33629E78DF400EC7E30 /* Localizable.stringsdict */,
 				69D2C32B29E77F2200EC7E30 /* Localizable.strings */,
-				69DA9A2229E17F0400A442DA /* InboundNearbyConnection.swift */,
 				698DFB0129E362140064F247 /* NDNotificationCenterHackery.h */,
 				698DFB0229E362140064F247 /* NDNotificationCenterHackery.m */,
-				698DFAE529E2F91A0064F247 /* NearbyConnection.swift */,
-				69DA9A2029E0CC4E00A442DA /* Data+Extensions.swift */,
 				69DA9A1829E0BF5200A442DA /* NearDrop.entitlements */,
 				698DFB0029E362140064F247 /* NearDrop-Bridging-Header.h */,
 				69D2C32E29E7898C00EC7E30 /* MainMenu.xib */,
@@ -148,9 +264,51 @@
 			path = Protobuf;
 			sourceTree = "<group>";
 		};
+		69DCF4822AB70D0600CBE2CC /* NearbyShare */ = {
+			isa = PBXGroup;
+			children = (
+				69DA9A2729E18CB500A442DA /* Protobuf */,
+				69DA9A1E29E0C0B300A442DA /* NearbyConnectionManager.swift */,
+				69DA9A2229E17F0400A442DA /* InboundNearbyConnection.swift */,
+				691F53BD2ABF03820089FD92 /* OutboundNearbyConnection.swift */,
+				698DFAE529E2F91A0064F247 /* NearbyConnection.swift */,
+				69DA9A2029E0CC4E00A442DA /* Data+Extensions.swift */,
+			);
+			path = NearbyShare;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
+/* Begin PBXHeadersBuildPhase section */
+		69DCF47D2AB70D0600CBE2CC /* Headers */ = {
+			isa = PBXHeadersBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXHeadersBuildPhase section */
+
 /* Begin PBXNativeTarget section */
+		699DEBA02AB0573200115D22 /* ShareExtension */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 699DEBB12AB0573200115D22 /* Build configuration list for PBXNativeTarget "ShareExtension" */;
+			buildPhases = (
+				699DEB9D2AB0573200115D22 /* Sources */,
+				699DEB9E2AB0573200115D22 /* Frameworks */,
+				699DEB9F2AB0573200115D22 /* Resources */,
+				69DCF4A12AB8C9A500CBE2CC /* Embed Libraries */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				69DCF4A02AB8C9A500CBE2CC /* PBXTargetDependency */,
+			);
+			name = ShareExtension;
+			productName = ShareExtension;
+			productReference = 699DEBA12AB0573200115D22 /* ShareExtension.appex */;
+			productType = "com.apple.product-type.app-extension";
+		};
 		69DA9A0D29E0BF5100A442DA /* NearDrop */ = {
 			isa = PBXNativeTarget;
 			buildConfigurationList = 69DA9A1B29E0BF5200A442DA /* Build configuration list for PBXNativeTarget "NearDrop" */;
@@ -159,19 +317,42 @@
 				69DA9A0B29E0BF5100A442DA /* Frameworks */,
 				69DA9A0C29E0BF5100A442DA /* Resources */,
 				698DFAFF29E353220064F247 /* Embed Foundation Extensions */,
+				699DEBDB2AB2828400115D22 /* Embed XPC Services */,
+				69DCF4982AB8BF7B00CBE2CC /* Embed Libraries */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				699DEBAD2AB0573200115D22 /* PBXTargetDependency */,
+				69DCF4972AB8BF7B00CBE2CC /* PBXTargetDependency */,
+			);
+			name = NearDrop;
+			packageProductDependencies = (
+			);
+			productName = NearDrop;
+			productReference = 69DA9A0E29E0BF5100A442DA /* NearDrop.app */;
+			productType = "com.apple.product-type.application";
+		};
+		69DCF4802AB70D0600CBE2CC /* NearbyShare */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 69DCF4892AB70D0600CBE2CC /* Build configuration list for PBXNativeTarget "NearbyShare" */;
+			buildPhases = (
+				69DCF47D2AB70D0600CBE2CC /* Headers */,
+				69DCF47E2AB70D0600CBE2CC /* Sources */,
+				69DCF47F2AB70D0600CBE2CC /* Frameworks */,
 			);
 			buildRules = (
 			);
 			dependencies = (
 			);
-			name = NearDrop;
+			name = NearbyShare;
 			packageProductDependencies = (
-				69DA9A2529E189EF00A442DA /* SwiftProtobuf */,
+				69DCF4992AB8C58500CBE2CC /* SwiftProtobuf */,
-				69DA9A3529E1994C00A442DA /* SwiftECC */,
+				69DCF49B2AB8C58500CBE2CC /* SwiftECC */,
 			);
-			productName = NearDrop;
+			productName = NearbyShare;
-			productReference = 69DA9A0E29E0BF5100A442DA /* NearDrop.app */;
+			productReference = 69DCF4812AB70D0600CBE2CC /* libNearbyShare.dylib */;
-			productType = "com.apple.product-type.application";
+			productType = "com.apple.product-type.library.dynamic";
 		};
 /* End PBXNativeTarget section */
 
@@ -183,10 +364,16 @@
 				LastSwiftUpdateCheck = 1430;
 				LastUpgradeCheck = 1430;
 				TargetAttributes = {
+					699DEBA02AB0573200115D22 = {
+						CreatedOnToolsVersion = 14.3.1;
+					};
 					69DA9A0D29E0BF5100A442DA = {
 						CreatedOnToolsVersion = 14.3;
 						LastSwiftMigration = 1430;
 					};
+					69DCF4802AB70D0600CBE2CC = {
+						CreatedOnToolsVersion = 14.3.1;
+					};
 				};
 			};
 			buildConfigurationList = 69DA9A0929E0BF5100A442DA /* Build configuration list for PBXProject "NearDrop" */;
@@ -212,11 +399,25 @@
 			projectRoot = "";
 			targets = (
 				69DA9A0D29E0BF5100A442DA /* NearDrop */,
+				699DEBA02AB0573200115D22 /* ShareExtension */,
+				69DCF4802AB70D0600CBE2CC /* NearbyShare */,
 			);
 		};
 /* End PBXProject section */
 
 /* Begin PBXResourcesBuildPhase section */
+		699DEB9F2AB0573200115D22 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				699B03452AB5FBA300E0D718 /* Assets.xcassets in Resources */,
+				691F53C72AC2594E0089FD92 /* Localizable.strings in Resources */,
+				691F53BC2ABB70840089FD92 /* DeviceListCell.xib in Resources */,
+				691F53CB2AC2599B0089FD92 /* Localizable.stringsdict in Resources */,
+				699DEBA92AB0573200115D22 /* ShareViewController.xib in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		69DA9A0C29E0BF5100A442DA /* Resources */ = {
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -231,28 +432,90 @@
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
+		699DEB9D2AB0573200115D22 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				699DEBA62AB0573200115D22 /* ShareViewController.swift in Sources */,
+				691F53BB2ABB70840089FD92 /* DeviceListCell.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		69DA9A0A29E0BF5100A442DA /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				69DA9A2E29E18CB500A442DA /* ukey.pb.swift in Sources */,
 				698DFB0329E362140064F247 /* NDNotificationCenterHackery.m in Sources */,
-				69DA9A2329E17F0400A442DA /* InboundNearbyConnection.swift in Sources */,
-				69DA9A1F29E0C0B300A442DA /* NearbyConnectionManager.swift in Sources */,
-				69DA9A3029E18CB500A442DA /* device_to_device_messages.pb.swift in Sources */,
-				69DA9A3129E18CB500A442DA /* offline_wire_formats.pb.swift in Sources */,
 				69DA9A1229E0BF5100A442DA /* AppDelegate.swift in Sources */,
-				69DA9A2F29E18CB500A442DA /* wire_format.pb.swift in Sources */,
+			);
-				69DA9A3329E18CB500A442DA /* securemessage.pb.swift in Sources */,
+			runOnlyForDeploymentPostprocessing = 0;
-				69DA9A2129E0CC4E00A442DA /* Data+Extensions.swift in Sources */,
+		};
-				69DA9A3229E18CB500A442DA /* securegcm.pb.swift in Sources */,
+		69DCF47E2AB70D0600CBE2CC /* Sources */ = {
-				698DFAE629E2F91A0064F247 /* NearbyConnection.swift in Sources */,
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				69DCF48D2AB70E8C00CBE2CC /* offline_wire_formats.pb.swift in Sources */,
+				69DCF48F2AB70E8C00CBE2CC /* securemessage.pb.swift in Sources */,
+				69DCF4912AB70E9700CBE2CC /* NearbyConnection.swift in Sources */,
+				69DCF4922AB70E9700CBE2CC /* NearbyConnectionManager.swift in Sources */,
+				69DCF48E2AB70E8C00CBE2CC /* securegcm.pb.swift in Sources */,
+				691F53BE2ABF03820089FD92 /* OutboundNearbyConnection.swift in Sources */,
+				69DCF48C2AB70E8C00CBE2CC /* device_to_device_messages.pb.swift in Sources */,
+				69DCF4902AB70E9700CBE2CC /* InboundNearbyConnection.swift in Sources */,
+				69DCF48B2AB70E8C00CBE2CC /* ukey.pb.swift in Sources */,
+				69DCF48A2AB70E8C00CBE2CC /* wire_format.pb.swift in Sources */,
+				69DCF4932AB70E9700CBE2CC /* Data+Extensions.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXSourcesBuildPhase section */
 
+/* Begin PBXTargetDependency section */
+		699DEBAD2AB0573200115D22 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 699DEBA02AB0573200115D22 /* ShareExtension */;
+			targetProxy = 699DEBAC2AB0573200115D22 /* PBXContainerItemProxy */;
+		};
+		69DCF4972AB8BF7B00CBE2CC /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 69DCF4802AB70D0600CBE2CC /* NearbyShare */;
+			targetProxy = 69DCF4962AB8BF7B00CBE2CC /* PBXContainerItemProxy */;
+		};
+		69DCF4A02AB8C9A500CBE2CC /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 69DCF4802AB70D0600CBE2CC /* NearbyShare */;
+			targetProxy = 69DCF49F2AB8C9A500CBE2CC /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
 /* Begin PBXVariantGroup section */
+		691F53C52AC2594E0089FD92 /* Localizable.strings */ = {
+			isa = PBXVariantGroup;
+			children = (
+				691F53C62AC2594E0089FD92 /* Base */,
+				691F53C82AC259630089FD92 /* ru */,
+			);
+			name = Localizable.strings;
+			sourceTree = "<group>";
+		};
+		691F53C92AC2599B0089FD92 /* Localizable.stringsdict */ = {
+			isa = PBXVariantGroup;
+			children = (
+				691F53CA2AC2599B0089FD92 /* Base */,
+				691F53CC2AC259A20089FD92 /* ru */,
+			);
+			name = Localizable.stringsdict;
+			sourceTree = "<group>";
+		};
+		699DEBA72AB0573200115D22 /* ShareViewController.xib */ = {
+			isa = PBXVariantGroup;
+			children = (
+				699DEBA82AB0573200115D22 /* Base */,
+				691F53C42AC257A30089FD92 /* ru */,
+			);
+			name = ShareViewController.xib;
+			sourceTree = "<group>";
+		};
 		69D2C32B29E77F2200EC7E30 /* Localizable.strings */ = {
 			isa = PBXVariantGroup;
 			children = (
@@ -282,6 +545,58 @@
 /* End PBXVariantGroup section */
 
 /* Begin XCBuildConfiguration section */
+		699DEBAF2AB0573200115D22 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_ENTITLEMENTS = ShareExtension/ShareExtension.entitlements;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = ShareExtension/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = NearDrop;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+					"@executable_path/../../../../Frameworks",
+				);
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = me.grishka.NearDrop.ShareExtension;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		699DEBB02AB0573200115D22 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_ENTITLEMENTS = ShareExtension/ShareExtension.entitlements;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = ShareExtension/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = NearDrop;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+					"@executable_path/../../../../Frameworks",
+				);
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = me.grishka.NearDrop.ShareExtension;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
 		69DA9A1929E0BF5200A442DA /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
@@ -333,7 +648,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 13.3;
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
@@ -388,7 +703,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 13.3;
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = macosx;
@@ -400,6 +715,7 @@
 		69DA9A1C29E0BF5200A442DA /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ENABLE_MODULES = YES;
@@ -431,6 +747,7 @@
 		69DA9A1D29E0BF5200A442DA /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ENABLE_MODULES = YES;
@@ -458,9 +775,46 @@
 			};
 			name = Release;
 		};
+		69DCF4872AB70D0600CBE2CC /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				DYLIB_COMPATIBILITY_VERSION = 1;
+				DYLIB_CURRENT_VERSION = 1;
+				EXECUTABLE_PREFIX = lib;
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		69DCF4882AB70D0600CBE2CC /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				DYLIB_COMPATIBILITY_VERSION = 1;
+				DYLIB_CURRENT_VERSION = 1;
+				EXECUTABLE_PREFIX = lib;
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
+		699DEBB12AB0573200115D22 /* Build configuration list for PBXNativeTarget "ShareExtension" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				699DEBAF2AB0573200115D22 /* Debug */,
+				699DEBB02AB0573200115D22 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		69DA9A0929E0BF5100A442DA /* Build configuration list for PBXProject "NearDrop" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
@@ -479,6 +833,15 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		69DCF4892AB70D0600CBE2CC /* Build configuration list for PBXNativeTarget "NearbyShare" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				69DCF4872AB70D0600CBE2CC /* Debug */,
+				69DCF4882AB70D0600CBE2CC /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 
 /* Begin XCRemoteSwiftPackageReference section */
@@ -501,12 +864,12 @@
 /* End XCRemoteSwiftPackageReference section */
 
 /* Begin XCSwiftPackageProductDependency section */
-		69DA9A2529E189EF00A442DA /* SwiftProtobuf */ = {
+		69DCF4992AB8C58500CBE2CC /* SwiftProtobuf */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = 69DA9A2429E189EF00A442DA /* XCRemoteSwiftPackageReference "swift-protobuf" */;
 			productName = SwiftProtobuf;
 		};
-		69DA9A3529E1994C00A442DA /* SwiftECC */ = {
+		69DCF49B2AB8C58500CBE2CC /* SwiftECC */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = 69DA9A3429E1994C00A442DA /* XCRemoteSwiftPackageReference "SwiftECC" */;
 			productName = SwiftECC;

NearDrop.xcodeproj/xcshareddata/xcschemes/ShareExtension.xcscheme

@@ -0,0 +1,95 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1430"
+   wasCreatedForAppExtension = "YES"
+   version = "2.0">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "699DEBA02AB0573200115D22"
+               BuildableName = "ShareExtension.appex"
+               BlueprintName = "ShareExtension"
+               ReferencedContainer = "container:NearDrop.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "69DA9A0D29E0BF5100A442DA"
+               BuildableName = "NearDrop.app"
+               BlueprintName = "NearDrop"
+               ReferencedContainer = "container:NearDrop.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = ""
+      selectedLauncherIdentifier = "Xcode.IDEFoundation.Launcher.PosixSpawn"
+      launchStyle = "0"
+      askForAppToLaunch = "Yes"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES"
+      launchAutomaticallySubstyle = "2">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "69DA9A0D29E0BF5100A442DA"
+            BuildableName = "NearDrop.app"
+            BlueprintName = "NearDrop"
+            ReferencedContainer = "container:NearDrop.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES"
+      askForAppToLaunch = "Yes"
+      launchAutomaticallySubstyle = "2">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "69DA9A0D29E0BF5100A442DA"
+            BuildableName = "NearDrop.app"
+            BlueprintName = "NearDrop"
+            ReferencedContainer = "container:NearDrop.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

NearDrop/AppDelegate.swift

@@ -7,12 +7,12 @@
 
 import Cocoa
 import UserNotifications
+import NearbyShare
 
 @main
-class AppDelegate: NSObject, NSApplicationDelegate{
+class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCenterDelegate, MainAppDelegate{
-
-    private var connectionManager:NearbyConnectionManager?
 	private var statusItem:NSStatusItem?
+	private var activeIncomingTransfers:[String:TransferInfo]=[:]
 
     func applicationDidFinishLaunching(_ aNotification: Notification) {
 		let menu=NSMenu()
@@ -32,10 +32,12 @@ class AppDelegate: NSObject, NSApplicationDelegate{
 				}
 			}
 		}
+		nc.delegate=self
 		let incomingTransfersCategory=NDNotificationCenterHackery.hackedNotificationCategory()
 		let errorsCategory=UNNotificationCategory(identifier: "ERRORS", actions: [], intentIdentifiers: [])
 		nc.setNotificationCategories([incomingTransfersCategory, errorsCategory])
-        connectionManager=NearbyConnectionManager()
+		NearbyConnectionManager.shared.mainAppDelegate=self
+		NearbyConnectionManager.shared.becomeVisible()
 	}
 
     func applicationWillTerminate(_ aNotification: Notification) {
@@ -60,5 +62,66 @@ class AppDelegate: NSObject, NSApplicationDelegate{
 			NSApplication.shared.terminate(nil)
 		}
 	}
+	
+	func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
+		let transferID=response.notification.request.content.userInfo["transferID"]! as! String
+		NearbyConnectionManager.shared.submitUserConsent(transferID: transferID, accept: response.actionIdentifier=="ACCEPT")
+		if response.actionIdentifier != "ACCEPT"{
+			activeIncomingTransfers.removeValue(forKey: transferID)
+		}
+		completionHandler()
 	}
 	
+	func obtainUserConsent(for transfer: TransferMetadata, from device: RemoteDeviceInfo) {
+		let notificationContent=UNMutableNotificationContent()
+		notificationContent.title="NearDrop"
+		notificationContent.subtitle=String(format:NSLocalizedString("PinCode", value: "PIN: %@", comment: ""), arguments: [transfer.pinCode!])
+		let fileStr:String
+		if transfer.files.count==1{
+			fileStr=transfer.files[0].name
+		}else{
+			fileStr=String.localizedStringWithFormat(NSLocalizedString("NFiles", value: "%d files", comment: ""), transfer.files.count)
+		}
+		notificationContent.body=String(format: NSLocalizedString("DeviceSendingFiles", value: "%1$@ is sending you %2$@", comment: ""), arguments: [device.name, fileStr])
+		notificationContent.sound = .default
+		notificationContent.categoryIdentifier="INCOMING_TRANSFERS"
+		notificationContent.userInfo=["transferID": transfer.id]
+		NDNotificationCenterHackery.removeDefaultAction(notificationContent)
+		let notificationReq=UNNotificationRequest(identifier: "transfer_"+transfer.id, content: notificationContent, trigger: nil)
+		self.activeIncomingTransfers[transfer.id]=TransferInfo(device: device, transfer: transfer)
+		UNUserNotificationCenter.current().add(notificationReq)
+	}
+	
+	func incomingTransfer(id: String, didFinishWith error: Error?) {
+		guard let transfer=self.activeIncomingTransfers[id] else {return}
+		if let error=error{
+			let notificationContent=UNMutableNotificationContent()
+			notificationContent.title=String(format: NSLocalizedString("TransferError", value: "Failed to receive files from %@", comment: ""), arguments: [transfer.device.name])
+			if let ne=(error as? NearbyError){
+				switch ne{
+				case .inputOutput(let er):
+					notificationContent.body=er.localizedDescription
+				case .protocolError(_):
+					notificationContent.body=NSLocalizedString("Error.Protocol", value: "Communication error", comment: "")
+				case .requiredFieldMissing:
+					notificationContent.body=NSLocalizedString("Error.Protocol", value: "Communication error", comment: "")
+				case .ukey2:
+					notificationContent.body=NSLocalizedString("Error.Crypto", value: "Encryption error", comment: "")
+				case .canceled(reason: _):
+					break; // can't happen for incoming transfers
+				}
+			}else{
+				notificationContent.body=error.localizedDescription
+			}
+			notificationContent.categoryIdentifier="ERRORS"
+			UNUserNotificationCenter.current().add(UNNotificationRequest(identifier: "transferError_"+id, content: notificationContent, trigger: nil))
+		}
+		UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: ["transfer_"+id])
+		self.activeIncomingTransfers.removeValue(forKey: id)
+	}
+}
+
+struct TransferInfo{
+	let device:RemoteDeviceInfo
+	let transfer:TransferMetadata
+}

NearDrop/NearbyConnectionManager.swift

@@ -1,134 +0,0 @@
-//
-//  NearbyConnectionManager.swift
-//  NearDrop
-//
-//  Created by Grishka on 08.04.2023.
-//
-
-import Foundation
-import Network
-import UserNotifications
-
-class NearbyConnectionManager : NSObject, NetServiceDelegate, InboundNearbyConnectionDelegate, UNUserNotificationCenterDelegate{
-	
-    private var tcpListener:NWListener;
-	private let endpointID:[UInt8]=generateEndpointID()
-	private var mdnsService:NetService?
-	private var activeConnections:[String:InboundNearbyConnection]=[:]
-    
-	override init() {
-        tcpListener=try! NWListener(using: NWParameters(tls: .none))
-		super.init()
-		UNUserNotificationCenter.current().delegate=self
-		startTCPListener()
-    }
-	
-	private func startTCPListener(){
-        tcpListener.stateUpdateHandler={(state:NWListener.State) in
-			if case .ready = state {
-				self.initMDNS()
-			}
-        }
-        tcpListener.newConnectionHandler={(connection:NWConnection) in
-			let id=UUID().uuidString
-			let conn=InboundNearbyConnection(connection: connection, id: id)
-			self.activeConnections[id]=conn
-			conn.delegate=self
-			conn.start()
-        }
-        tcpListener.start(queue: .global(qos: .utility))
-	}
-	
-	private static func generateEndpointID()->[UInt8]{
-		var id:[UInt8]=[]
-		let alphabet="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".compactMap {UInt8($0.asciiValue!)}
-		for _ in 0...3{
-			id.append(alphabet[Int.random(in: 0..<alphabet.count)])
-		}
-		return id
-	}
-	
-	private func initMDNS(){
-		let nameBytes:[UInt8]=[
-			0x23, // PCP
-			endpointID[0], endpointID[1], endpointID[2], endpointID[3],
-			0xFC, 0x9F, 0x5E, // Service ID hash
-			0, 0
-		]
-		let name=Data(nameBytes).urlSafeBase64EncodedString()
-		// 1 byte: Version(3 bits)|Visibility(1 bit)|Device Type(3 bits)|Reserved(1 bits)
-		// Device types: unknown=0, phone=1, tablet=2, laptop=3
-		var endpointInfo:[UInt8]=[3 << 1]
-		// 16 bytes: unknown random bytes
-		for _ in 0...15{
-			endpointInfo.append(UInt8.random(in: 0...255))
-		}
-		// Device name in UTF-8 prefixed with 1-byte length
-		let hostName=Host.current().localizedName!
-		let hostNameChars=hostName.utf8
-		endpointInfo.append(UInt8(hostNameChars.count))
-		for (i, ch) in hostNameChars.enumerated(){
-			guard i<256 else {break}
-			endpointInfo.append(UInt8(ch))
-		}
-		
-		let port:Int32=Int32(tcpListener.port!.rawValue)
-		mdnsService=NetService(domain: "", type: "_FC9F5ED42C8A._tcp.", name: name, port: port)
-		mdnsService?.delegate=self
-		mdnsService?.includesPeerToPeer=true
-		mdnsService?.setTXTRecord(NetService.data(fromTXTRecord: [
-			"n": Data(endpointInfo).urlSafeBase64EncodedString().data(using: .utf8)!
-		]))
-		mdnsService?.publish()
-	}
-	
-	func obtainUserConsent(for transfer: TransferMetadata, from device: RemoteDeviceInfo, connection: InboundNearbyConnection) {
-		let notificationContent=UNMutableNotificationContent()
-		notificationContent.title="NearDrop"
-		notificationContent.subtitle=String(format:NSLocalizedString("PinCode", value: "PIN: %@", comment: ""), arguments: [connection.pinCode!])
-		let fileStr:String
-		if transfer.files.count==1{
-			fileStr=transfer.files[0].name
-		}else{
-			fileStr=String.localizedStringWithFormat(NSLocalizedString("NFiles", value: "%d files", comment: ""), transfer.files.count)
-		}
-		notificationContent.body=String(format: NSLocalizedString("DeviceSendingFiles", value: "%1$@ is sending you %2$@", comment: ""), arguments: [device.name, fileStr])
-		notificationContent.sound = .default
-		notificationContent.categoryIdentifier="INCOMING_TRANSFERS"
-		notificationContent.userInfo=["transferID": connection.id]
-		NDNotificationCenterHackery.removeDefaultAction(notificationContent)
-		let notificationReq=UNNotificationRequest(identifier: "transfer_"+connection.id, content: notificationContent, trigger: nil)
-		UNUserNotificationCenter.current().add(notificationReq)
-	}
-	
-	func connectionWasTerminated(connection:InboundNearbyConnection, error:Error?){
-		activeConnections.removeValue(forKey: connection.id)
-		if let error=error{
-			let notificationContent=UNMutableNotificationContent()
-			notificationContent.title=String(format: NSLocalizedString("TransferError", value: "Failed to receive files from %@", comment: ""), arguments: [connection.remoteDeviceInfo!.name])
-			if let ne=(error as? NearbyError){
-				switch ne{
-				case .inputOutput(let er):
-					notificationContent.body=er.localizedDescription
-				case .protocolError(_):
-					notificationContent.body=NSLocalizedString("Error.Protocol", value: "Communication error", comment: "")
-				case .requiredFieldMissing:
-					notificationContent.body=NSLocalizedString("Error.Protocol", value: "Communication error", comment: "")
-				case .ukey2:
-					notificationContent.body=NSLocalizedString("Error.Crypto", value: "Encryption error", comment: "")
-				}
-			}else{
-				notificationContent.body=error.localizedDescription
-			}
-			notificationContent.categoryIdentifier="ERRORS"
-			UNUserNotificationCenter.current().add(UNNotificationRequest(identifier: "transferError_"+connection.id, content: notificationContent, trigger: nil))
-		}
-		UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: ["transfer_"+connection.id])
-	}
-	
-	func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
-		activeConnections[response.notification.request.content.userInfo["transferID"]! as! String]?.submitUserConsent(accepted: response.actionIdentifier=="ACCEPT")
-		completionHandler()
-	}
-}
-

NearbyShare/Data+Extensions.swift

@@ -28,4 +28,20 @@ extension Data{
 		}
 		return data
 	}
+	
+	static func dataFromUrlSafeBase64(_ str:String)->Data?{
+		var regularB64=String(str.map{
+			if $0=="_"{
+				return "/"
+			}else if $0=="-"{
+				return "+"
+			}else{
+				return $0
+			}
+		})
+		while (regularB64.count%4) != 0{
+			regularB64=regularB64+"="
+		}
+		return Data(base64Encoded: regularB64, options: .ignoreUnknownCharacters)
+	}
 }

NearbyShare/InboundNearbyConnection.swift

@@ -63,8 +63,10 @@ class InboundNearbyConnection: NearbyConnection{
 			}
 		}catch{
 			lastError=error
-			print("Deserialization error: \(error)")
+			print("Deserialization error: \(error) in state \(currentState)")
+#if !DEBUG
 			protocolError()
+#endif
 		}
 	}
 	
@@ -279,7 +281,7 @@ class InboundNearbyConnection: NearbyConnection{
 									  destinationURL: dest)
 			transferredFiles[file.payloadID]=info
 		}
-		let metadata=TransferMetadata(files: transferredFiles.map({$0.value.meta}))
+		let metadata=TransferMetadata(files: transferredFiles.map({$0.value.meta}), id: id, pinCode: pinCode)
 		DispatchQueue.main.async {
 			self.delegate?.obtainUserConsent(for: metadata, from: self.remoteDeviceInfo!, connection: self)
 		}

NearbyShare/NearbyConnection.swift

@@ -16,6 +16,7 @@ import BigInt
 
 class NearbyConnection{
 	internal static let SANE_FRAME_LENGTH=5*1024*1024
+	private static let dispatchQueue=DispatchQueue(label: "me.grishka.NearDrop.queue", qos: .utility) // FIFO (non-concurrent) queue to avoid those exciting concurrency bugs
 	
 	internal let connection:NWConnection
 	internal var remoteDeviceInfo:RemoteDeviceInfo?
@@ -52,6 +53,7 @@ class NearbyConnection{
 	func start(){
 		connection.stateUpdateHandler={state in
 			if case .ready = state {
+				self.connectionReady()
 				self.receiveFrameAsync()
 			} else if case .failed(let err) = state {
 				self.lastError=err
@@ -59,9 +61,12 @@ class NearbyConnection{
 				self.handleConnectionClosure()
 			}
 		}
-		connection.start(queue: .global(qos: .utility))
+		//connection.start(queue: .global(qos: .utility))
+		connection.start(queue: NearbyConnection.dispatchQueue)
 	}
 	
+	func connectionReady(){}
+	
 	internal func handleConnectionClosure(){
 		print("Connection closed")
 	}
@@ -132,22 +137,27 @@ class NearbyConnection{
 		}
 	}
 	
-	internal func sendFrameAsync(_ frame:Data){
+	internal func sendFrameAsync(_ frame:Data, completion:(()->Void)?=nil){
+		if connectionClosed{
+			return
+		}
 		var lengthPrefixedData=Data(capacity: frame.count+4)
 		let length:Int=frame.count
 		lengthPrefixedData.append(contentsOf: [
-			UInt8(length >> 24),
+			UInt8(truncatingIfNeeded: length >> 24),
-			UInt8(length >> 16),
+			UInt8(truncatingIfNeeded: length >> 16),
-			UInt8(length >> 8),
+			UInt8(truncatingIfNeeded: length >> 8),
-			UInt8(length)
+			UInt8(truncatingIfNeeded: length)
 		])
 		lengthPrefixedData.append(frame)
 		connection.send(content: lengthPrefixedData, completion: .contentProcessed({ error in
-			
+			if let completion=completion{
+				completion()
+			}
 		}))
 	}
 	
-	internal func encryptAndSendOfflineFrame(_ frame:Location_Nearby_Connections_OfflineFrame) throws{
+	internal func encryptAndSendOfflineFrame(_ frame:Location_Nearby_Connections_OfflineFrame, completion:(()->Void)?=nil) throws{
 		var d2dMsg=Securegcm_DeviceToDeviceMessage()
 		serverSeq+=1
 		d2dMsg.sequenceNumber=serverSeq
@@ -185,7 +195,7 @@ class NearbyConnection{
 		var smsg=Securemessage_SecureMessage()
 		smsg.headerAndBody=try hb.serializedData()
 		smsg.signature=Data(HMAC<SHA256>.authenticationCode(for: smsg.headerAndBody, using: sendHmacKey!))
-		sendFrameAsync(try smsg.serializedData())
+		sendFrameAsync(try smsg.serializedData(), completion: completion)
 	}
 	
 	internal func sendTransferSetupFrame(_ frame:Sharing_Nearby_Frame) throws{
@@ -275,6 +285,9 @@ class NearbyConnection{
 				try processFileChunk(frame: payloadTransfer)
 			}
 		}else if case .keepAlive = offlineFrame.v1.type{
+			#if DEBUG
+			print("Sent keep-alive")
+			#endif
 			sendKeepAlive(ack: true)
 		}else{
 			print("Unhandled offline frame encrypted: \(offlineFrame)")
@@ -402,51 +415,6 @@ class NearbyConnection{
 	}
 }
 
-enum NearbyError:Error{
-	case protocolError(_ message:String)
-	case requiredFieldMissing
-	case ukey2
-	case inputOutput(cause:Errno)
-}
-
-
-struct RemoteDeviceInfo{
-	let name:String
-	let type:DeviceType
-	
-	enum DeviceType{
-		case unknown
-		case phone
-		case tablet
-		case computer
-		
-		static func fromRawValue(value:Int) -> DeviceType{
-			switch value {
-			case 0:
-				return .unknown
-			case 1:
-				return .phone
-			case 2:
-				return .tablet
-			case 3:
-				return .computer
-			default:
-				return .unknown
-			}
-		}
-	}
-}
-
-struct TransferMetadata{
-	let files:[FileMetadata]
-}
-
-struct FileMetadata{
-	let name:String
-	let size:Int64
-	let mimeType:String
-}
-
 struct InternalFileInfo{
 	let meta:FileMetadata
 	let payloadID:Int64

NearbyShare/NearbyConnectionManager.swift

@@ -0,0 +1,374 @@
+//
+//  NearbyConnectionManager.swift
+//  NearDrop
+//
+//  Created by Grishka on 08.04.2023.
+//
+
+import Foundation
+import Network
+import System
+
+public struct RemoteDeviceInfo{
+	public let name:String
+	public let type:DeviceType
+	public var id:String?
+	
+	init(name: String, type: DeviceType, id: String? = nil) {
+		self.name = name
+		self.type = type
+		self.id = id
+	}
+	
+	init(info:EndpointInfo){
+		self.name=info.name
+		self.type=info.deviceType
+	}
+	
+	public enum DeviceType:Int32{
+		case unknown=0
+		case phone
+		case tablet
+		case computer
+		
+		public static func fromRawValue(value:Int) -> DeviceType{
+			switch value {
+			case 0:
+				return .unknown
+			case 1:
+				return .phone
+			case 2:
+				return .tablet
+			case 3:
+				return .computer
+			default:
+				return .unknown
+			}
+		}
+	}
+}
+
+
+public enum NearbyError:Error{
+	case protocolError(_ message:String)
+	case requiredFieldMissing
+	case ukey2
+	case inputOutput(cause:Errno)
+	case canceled(reason:CancellationReason)
+	
+	public enum CancellationReason{
+		case userRejected, userCanceled, notEnoughSpace, unsupportedType, timedOut
+	}
+}
+
+public struct TransferMetadata{
+	public let files:[FileMetadata]
+	public let id:String
+	public let pinCode:String?
+}
+
+public struct FileMetadata{
+	public let name:String
+	public let size:Int64
+	public let mimeType:String
+}
+
+struct FoundServiceInfo{
+	let service:NWBrowser.Result
+	var device:RemoteDeviceInfo?
+}
+
+struct OutgoingTransferInfo{
+	let service:NWBrowser.Result
+	let device:RemoteDeviceInfo
+	let connection:OutboundNearbyConnection
+	let delegate:ShareExtensionDelegate
+}
+
+struct EndpointInfo{
+	let name:String
+	let deviceType:RemoteDeviceInfo.DeviceType
+	
+	init(name: String, deviceType: RemoteDeviceInfo.DeviceType){
+		self.name = name
+		self.deviceType = deviceType
+	}
+	
+	init?(data:Data){
+		guard data.count>17 else {return nil}
+		let deviceNameLength=Int(data[17])
+		guard data.count>=deviceNameLength+18 else {return nil}
+		guard let deviceName=String(data: data[18..<(18+deviceNameLength)], encoding: .utf8) else {return nil}
+		let rawDeviceType:Int=Int(data[0] & 7) >> 1
+		self.name=deviceName
+		self.deviceType=RemoteDeviceInfo.DeviceType.fromRawValue(value: rawDeviceType)
+	}
+	
+	func serialize()->Data{
+		// 1 byte: Version(3 bits)|Visibility(1 bit)|Device Type(3 bits)|Reserved(1 bits)
+		// Device types: unknown=0, phone=1, tablet=2, laptop=3
+		var endpointInfo:[UInt8]=[UInt8(deviceType.rawValue << 1)]
+		// 16 bytes: unknown random bytes
+		for _ in 0...15{
+			endpointInfo.append(UInt8.random(in: 0...255))
+		}
+		// Device name in UTF-8 prefixed with 1-byte length
+		var nameChars=[UInt8](name.utf8)
+		if nameChars.count>255{
+			nameChars=[UInt8](nameChars[0..<255])
+		}
+		endpointInfo.append(UInt8(nameChars.count))
+		for ch in nameChars{
+			endpointInfo.append(UInt8(ch))
+		}
+		return Data(endpointInfo)
+	}
+}
+
+public protocol MainAppDelegate{
+	func obtainUserConsent(for transfer:TransferMetadata, from device:RemoteDeviceInfo)
+	func incomingTransfer(id:String, didFinishWith error:Error?)
+}
+
+public protocol ShareExtensionDelegate:AnyObject{
+	func addDevice(device:RemoteDeviceInfo)
+	func removeDevice(id:String)
+	func connectionWasEstablished(pinCode:String)
+	func connectionFailed(with error:Error)
+	func transferAccepted()
+	func transferProgress(progress:Double)
+	func transferFinished()
+}
+
+public class NearbyConnectionManager : NSObject, NetServiceDelegate, InboundNearbyConnectionDelegate, OutboundNearbyConnectionDelegate{
+	
+	private var tcpListener:NWListener;
+	public let endpointID:[UInt8]=generateEndpointID()
+	private var mdnsService:NetService?
+	private var activeConnections:[String:InboundNearbyConnection]=[:]
+	private var foundServices:[String:FoundServiceInfo]=[:]
+	private var shareExtensionDelegates:[ShareExtensionDelegate]=[]
+	private var outgoingTransfers:[String:OutgoingTransferInfo]=[:]
+	public var mainAppDelegate:(any MainAppDelegate)?
+	private var discoveryRefCount=0
+	
+	private var browser:NWBrowser?
+	
+	public static let shared=NearbyConnectionManager()
+	
+	override init() {
+		tcpListener=try! NWListener(using: NWParameters(tls: .none))
+		super.init()
+	}
+	
+	public func becomeVisible(){
+		startTCPListener()
+	}
+	
+	private func startTCPListener(){
+		tcpListener.stateUpdateHandler={(state:NWListener.State) in
+			if case .ready = state {
+				self.initMDNS()
+			}
+		}
+		tcpListener.newConnectionHandler={(connection:NWConnection) in
+			let id=UUID().uuidString
+			let conn=InboundNearbyConnection(connection: connection, id: id)
+			self.activeConnections[id]=conn
+			conn.delegate=self
+			conn.start()
+		}
+		tcpListener.start(queue: .global(qos: .utility))
+	}
+	
+	private static func generateEndpointID()->[UInt8]{
+		var id:[UInt8]=[]
+		let alphabet="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".compactMap {UInt8($0.asciiValue!)}
+		for _ in 0...3{
+			id.append(alphabet[Int.random(in: 0..<alphabet.count)])
+		}
+		return id
+	}
+	
+	private func initMDNS(){
+		let nameBytes:[UInt8]=[
+			0x23, // PCP
+			endpointID[0], endpointID[1], endpointID[2], endpointID[3],
+			0xFC, 0x9F, 0x5E, // Service ID hash
+			0, 0
+		]
+		let name=Data(nameBytes).urlSafeBase64EncodedString()
+		let endpointInfo=EndpointInfo(name: Host.current().localizedName!, deviceType: .computer)
+		
+		let port:Int32=Int32(tcpListener.port!.rawValue)
+		mdnsService=NetService(domain: "", type: "_FC9F5ED42C8A._tcp.", name: name, port: port)
+		mdnsService?.delegate=self
+		mdnsService?.includesPeerToPeer=true
+		mdnsService?.setTXTRecord(NetService.data(fromTXTRecord: [
+			"n": endpointInfo.serialize().urlSafeBase64EncodedString().data(using: .utf8)!
+		]))
+		mdnsService?.publish()
+	}
+	
+	func obtainUserConsent(for transfer: TransferMetadata, from device: RemoteDeviceInfo, connection: InboundNearbyConnection) {
+		guard let delegate=mainAppDelegate else {return}
+		delegate.obtainUserConsent(for: transfer, from: device)
+	}
+	
+	func connectionWasTerminated(connection:InboundNearbyConnection, error:Error?){
+		guard let delegate=mainAppDelegate else {return}
+		delegate.incomingTransfer(id: connection.id, didFinishWith: error)
+		activeConnections.removeValue(forKey: connection.id)
+	}
+	
+	public func submitUserConsent(transferID:String, accept:Bool){
+		guard let conn=activeConnections[transferID] else {return}
+		conn.submitUserConsent(accepted: accept)
+	}
+	
+	public func startDeviceDiscovery(){
+		if discoveryRefCount==0{
+			foundServices.removeAll()
+			if browser==nil{
+				browser=NWBrowser(for: .bonjourWithTXTRecord(type: "_FC9F5ED42C8A._tcp.", domain: nil), using: .tcp)
+				browser?.browseResultsChangedHandler={newResults, changes in
+					for change in changes{
+						switch change{
+						case let .added(res):
+							self.maybeAddFoundDevice(service: res)
+						case let .removed(res):
+							self.maybeRemoveFoundDevice(service: res)
+						default:
+							break
+						}
+					}
+				}
+			}
+			browser?.start(queue: .main)
+		}
+		discoveryRefCount+=1
+	}
+	
+	public func stopDeviceDiscovery(){
+		discoveryRefCount-=1
+		assert(discoveryRefCount>=0)
+		if discoveryRefCount==0{
+			browser?.cancel()
+			browser=nil
+		}
+	}
+	
+	public func addShareExtensionDelegate(_ delegate:ShareExtensionDelegate){
+		shareExtensionDelegates.append(delegate)
+		for service in foundServices.values{
+			guard let device=service.device else {continue}
+			delegate.addDevice(device: device)
+		}
+	}
+	
+	public func removeShareExtensionDelegate(_ delegate:ShareExtensionDelegate){
+		shareExtensionDelegates.removeAll(where: {$0===delegate})
+	}
+	
+	public func cancelOutgoingTransfer(id:String){
+		guard let transfer=outgoingTransfers[id] else {return}
+		transfer.connection.cancel()
+	}
+	
+	private func endpointID(for service:NWBrowser.Result)->String?{
+		guard case let NWEndpoint.service(name: serviceName, type: _, domain: _, interface: _)=service.endpoint else {return nil}
+		guard let nameData=Data.dataFromUrlSafeBase64(serviceName) else {return nil}
+		guard nameData.count>=10 else {return nil}
+		let pcp=nameData[0]
+		guard pcp==0x23 else {return nil}
+		let endpointID=String(data: nameData.subdata(in: 1..<5), encoding: .ascii)!
+		let serviceIDHash=nameData.subdata(in: 5..<8)
+		guard serviceIDHash==Data([0xFC, 0x9F, 0x5E]) else {return nil}
+		return endpointID
+	}
+	
+	private func maybeAddFoundDevice(service:NWBrowser.Result){
+		#if DEBUG
+		print("found service \(service)")
+		#endif
+		guard let endpointID=endpointID(for: service) else {return}
+		#if DEBUG
+		print("service name is valid, endpoint ID \(endpointID)")
+		#endif
+		var foundService=FoundServiceInfo(service: service)
+		
+		guard case let NWBrowser.Result.Metadata.bonjour(txtRecord)=service.metadata else {return}
+		guard let endpointInfoEncoded=txtRecord.dictionary["n"] else {return}
+		guard let endpointInfo=Data.dataFromUrlSafeBase64(endpointInfoEncoded) else {return}
+		guard endpointInfo.count>=19 else {return}
+		let deviceType=RemoteDeviceInfo.DeviceType.fromRawValue(value: (Int(endpointInfo[0]) >> 1) & 7)
+		let deviceNameLength=Int(endpointInfo[17])
+		guard endpointInfo.count>=deviceNameLength+17 else {return}
+		guard let deviceName=String(data: endpointInfo.subdata(in: 18..<(18+deviceNameLength)), encoding: .utf8) else {return}
+		
+		let deviceInfo=RemoteDeviceInfo(name: deviceName, type: deviceType, id: endpointID)
+		foundService.device=deviceInfo
+		foundServices[endpointID]=foundService
+		for delegate in shareExtensionDelegates{
+			delegate.addDevice(device: deviceInfo)
+		}
+	}
+	
+	private func maybeRemoveFoundDevice(service:NWBrowser.Result){
+		guard let endpointID=endpointID(for: service) else {return}
+		guard let _=foundServices.removeValue(forKey: endpointID) else {return}
+		for delegate in shareExtensionDelegates {
+			delegate.removeDevice(id: endpointID)
+		}
+	}
+	
+	public func startOutgoingTransfer(deviceID:String, delegate:ShareExtensionDelegate, urls:[URL]){
+		guard let info=foundServices[deviceID] else {return}
+		let tcp=NWProtocolTCP.Options.init()
+		tcp.noDelay=true
+		let nwconn=NWConnection(to: info.service.endpoint, using: NWParameters(tls: .none, tcp: tcp))
+		let conn=OutboundNearbyConnection(connection: nwconn, id: deviceID, urlsToSend: urls)
+		conn.delegate=self
+		let transfer=OutgoingTransferInfo(service: info.service, device: info.device!, connection: conn, delegate: delegate)
+		outgoingTransfers[deviceID]=transfer
+		conn.start()
+	}
+	
+	func outboundConnectionWasEstablished(connection: OutboundNearbyConnection) {
+		guard let transfer=outgoingTransfers[connection.id] else {return}
+		DispatchQueue.main.async {
+			transfer.delegate.connectionWasEstablished(pinCode: connection.pinCode!)
+		}
+	}
+	
+	func outboundConnectionTransferAccepted(connection: OutboundNearbyConnection) {
+		guard let transfer=outgoingTransfers[connection.id] else {return}
+		DispatchQueue.main.async {
+			transfer.delegate.transferAccepted()
+		}
+	}
+	
+	func outboundConnection(connection: OutboundNearbyConnection, transferProgress: Double) {
+		guard let transfer=outgoingTransfers[connection.id] else {return}
+		DispatchQueue.main.async {
+			transfer.delegate.transferProgress(progress: transferProgress)
+		}
+	}
+	
+	func outboundConnection(connection: OutboundNearbyConnection, failedWithError: Error) {
+		guard let transfer=outgoingTransfers[connection.id] else {return}
+		DispatchQueue.main.async {
+			transfer.delegate.connectionFailed(with: failedWithError)
+		}
+		outgoingTransfers.removeValue(forKey: connection.id)
+	}
+	
+	func outboundConnectionTransferFinished(connection: OutboundNearbyConnection) {
+		guard let transfer=outgoingTransfers[connection.id] else {return}
+		DispatchQueue.main.async {
+			transfer.delegate.transferFinished()
+		}
+		outgoingTransfers.removeValue(forKey: connection.id)
+	}
+}
+

NearbyShare/OutboundNearbyConnection.swift

@@ -0,0 +1,424 @@
+//
+//  OutboundNearbyConnection.swift
+//  NearbyShare
+//
+//  Created by Grishka on 23.09.2023.
+//
+
+import Foundation
+import Network
+import CryptoKit
+import CommonCrypto
+import System
+import UniformTypeIdentifiers
+
+import SwiftECC
+import BigInt
+
+class OutboundNearbyConnection:NearbyConnection{
+	private var currentState:State = .initial
+	private let urlsToSend:[URL]
+	private var ukeyClientFinishMsgData:Data?
+	private var queue:[OutgoingFileTransfer]=[]
+	private var currentTransfer:OutgoingFileTransfer?
+	public var delegate:OutboundNearbyConnectionDelegate?
+	private var totalBytesToSend:Int64=0
+	private var totalBytesSent:Int64=0
+	private var cancelled:Bool=false
+	
+	enum State{
+		case initial, sentUkeyClientInit, sentUkeyClientFinish, sentPairedKeyEncryption, sentPairedKeyResult, sentIntroduction, sendingFiles
+	}
+	
+	init(connection: NWConnection, id: String, urlsToSend:[URL]){
+		self.urlsToSend=urlsToSend
+		super.init(connection: connection, id: id)
+	}
+	
+	deinit {
+		if let transfer=currentTransfer, let handle=transfer.handle{
+			try? handle.close()
+		}
+		for transfer in queue{
+			if let handle=transfer.handle{
+				try? handle.close()
+			}
+		}
+	}
+	
+	public func cancel(){
+		cancelled=true
+		if encryptionDone{
+			var cancel=Sharing_Nearby_Frame()
+			cancel.version = .v1
+			cancel.v1=Sharing_Nearby_V1Frame()
+			cancel.v1.type = .cancel
+			try? sendTransferSetupFrame(cancel)
+		}
+		try? sendDisconnectionAndDisconnect()
+	}
+	
+	override func connectionReady() {
+		super.connectionReady()
+		do{
+			try sendConnectionRequest()
+			try sendUkey2ClientInit()
+		}catch{
+			lastError=error
+			protocolError()
+		}
+	}
+	
+	override func isServer() -> Bool {
+		return false
+	}
+	
+	override func processReceivedFrame(frameData: Data) {
+		do{
+			#if DEBUG
+			print("received \(frameData), state is \(currentState)")
+			#endif
+			switch currentState {
+			case .initial:
+				protocolError()
+			case .sentUkeyClientInit:
+				try processUkey2ServerInit(frame: try Securegcm_Ukey2Message(serializedData: frameData), raw: frameData)
+			case .sentUkeyClientFinish:
+				try processConnectionResponse(frame: try Location_Nearby_Connections_OfflineFrame(serializedData: frameData))
+			default:
+				let smsg=try Securemessage_SecureMessage(serializedData: frameData)
+				try decryptAndProcessReceivedSecureMessage(smsg)
+			}
+		}catch{
+			if case NearbyError.ukey2=error{
+			}else if currentState == .sentUkeyClientInit{
+				sendUkey2Alert(type: .badMessage)
+			}
+			lastError=error
+			protocolError()
+		}
+	}
+	
+	override func processTransferSetupFrame(_ frame: Sharing_Nearby_Frame) throws {
+		if frame.hasV1 && frame.v1.hasType, case .cancel = frame.v1.type {
+			print("Transfer canceled")
+			try sendDisconnectionAndDisconnect()
+			delegate?.outboundConnection(connection: self, failedWithError: NearbyError.canceled(reason: .userCanceled))
+			return
+		}
+		print(frame)
+		switch currentState{
+		case .sentPairedKeyEncryption:
+			try processPairedKeyEncryption(frame: frame)
+		case .sentPairedKeyResult:
+			try processPairedKeyResult(frame: frame)
+		case .sentIntroduction:
+			try processConsent(frame: frame)
+		case .sendingFiles:
+			break
+		default:
+			assertionFailure("Unexpected state \(currentState)")
+		}
+	}
+	
+	override func protocolError() {
+		super.protocolError()
+		delegate?.outboundConnection(connection: self, failedWithError: lastError!)
+	}
+	
+	private func sendConnectionRequest() throws {
+		var frame=Location_Nearby_Connections_OfflineFrame()
+		frame.version = .v1
+		frame.v1=Location_Nearby_Connections_V1Frame()
+		frame.v1.type = .connectionRequest
+		frame.v1.connectionRequest=Location_Nearby_Connections_ConnectionRequestFrame()
+		frame.v1.connectionRequest.endpointID=String(bytes: NearbyConnectionManager.shared.endpointID, encoding: .ascii)!
+		frame.v1.connectionRequest.endpointName=Host.current().localizedName!
+		let endpointInfo=EndpointInfo(name: Host.current().localizedName!, deviceType: .computer)
+		frame.v1.connectionRequest.endpointInfo=endpointInfo.serialize()
+		frame.v1.connectionRequest.mediums=[.wifiLan]
+		sendFrameAsync(try frame.serializedData())
+	}
+	
+	private func sendUkey2ClientInit() throws {
+		let domain=Domain.instance(curve: .EC256r1)
+		let (pubKey, privKey)=domain.makeKeyPair()
+		publicKey=pubKey
+		privateKey=privKey
+		
+		var finishFrame=Securegcm_Ukey2Message()
+		finishFrame.messageType = .clientFinish
+		var finish=Securegcm_Ukey2ClientFinished()
+		var pkey=Securemessage_GenericPublicKey()
+		pkey.type = .ecP256
+		pkey.ecP256PublicKey=Securemessage_EcP256PublicKey()
+		pkey.ecP256PublicKey.x=Data(pubKey.w.x.asSignedBytes())
+		pkey.ecP256PublicKey.y=Data(pubKey.w.y.asSignedBytes())
+		finish.publicKey=try pkey.serializedData()
+		finishFrame.messageData=try finish.serializedData()
+		ukeyClientFinishMsgData=try finishFrame.serializedData()
+		
+		var frame=Securegcm_Ukey2Message()
+		frame.messageType = .clientInit
+		
+		var clientInit=Securegcm_Ukey2ClientInit()
+		clientInit.version=1
+		clientInit.random=Data.randomData(length: 32)
+		clientInit.nextProtocol="AES_256_CBC-HMAC_SHA256"
+		var sha=SHA512()
+		sha.update(data: ukeyClientFinishMsgData!)
+		var commitment=Securegcm_Ukey2ClientInit.CipherCommitment()
+		commitment.commitment=Data(sha.finalize())
+		commitment.handshakeCipher = .p256Sha512
+		clientInit.cipherCommitments.append(commitment)
+		frame.messageData=try clientInit.serializedData()
+		
+		ukeyClientInitMsgData=try frame.serializedData()
+		sendFrameAsync(ukeyClientInitMsgData!)
+		currentState = .sentUkeyClientInit
+	}
+	
+	private func processUkey2ServerInit(frame:Securegcm_Ukey2Message, raw:Data) throws{
+		ukeyServerInitMsgData=raw
+		guard frame.messageType == .serverInit else{
+			sendUkey2Alert(type: .badMessageType)
+			throw NearbyError.ukey2
+		}
+		let serverInit=try Securegcm_Ukey2ServerInit(serializedData: frame.messageData)
+		guard serverInit.version==1 else{
+			sendUkey2Alert(type: .badVersion)
+			throw NearbyError.ukey2
+		}
+		guard serverInit.random.count==32 else{
+			sendUkey2Alert(type: .badRandom)
+			throw NearbyError.ukey2
+		}
+		guard serverInit.handshakeCipher == .p256Sha512 else{
+			sendUkey2Alert(type: .badHandshakeCipher)
+			throw NearbyError.ukey2
+		}
+		
+		let serverKey=try Securemessage_GenericPublicKey(serializedData: serverInit.publicKey)
+		try finalizeKeyExchange(peerKey: serverKey)
+		sendFrameAsync(ukeyClientFinishMsgData!)
+		currentState = .sentUkeyClientFinish
+		
+		var resp=Location_Nearby_Connections_OfflineFrame()
+		resp.version = .v1
+		resp.v1=Location_Nearby_Connections_V1Frame()
+		resp.v1.type = .connectionResponse
+		resp.v1.connectionResponse=Location_Nearby_Connections_ConnectionResponseFrame()
+		resp.v1.connectionResponse.response = .accept
+		resp.v1.connectionResponse.status=0
+		resp.v1.connectionResponse.osInfo=Location_Nearby_Connections_OsInfo()
+		resp.v1.connectionResponse.osInfo.type = .apple
+		sendFrameAsync(try resp.serializedData())
+		
+		encryptionDone=true
+		delegate?.outboundConnectionWasEstablished(connection: self)
+	}
+	
+	private func processConnectionResponse(frame:Location_Nearby_Connections_OfflineFrame) throws{
+		#if DEBUG
+		print("connection response: \(frame)")
+		#endif
+		guard frame.version == .v1 else {throw NearbyError.protocolError("Unexpected offline frame version \(frame.version)")}
+		guard frame.v1.type == .connectionResponse else {throw NearbyError.protocolError("Unexpected frame type \(frame.v1.type)")}
+		guard frame.v1.connectionResponse.response == .accept else {throw NearbyError.protocolError("Connection was rejected by recipient")}
+		
+		var pairedEncryption=Sharing_Nearby_Frame()
+		pairedEncryption.version = .v1
+		pairedEncryption.v1=Sharing_Nearby_V1Frame()
+		pairedEncryption.v1.type = .pairedKeyEncryption
+		pairedEncryption.v1.pairedKeyEncryption=Sharing_Nearby_PairedKeyEncryptionFrame()
+		pairedEncryption.v1.pairedKeyEncryption.secretIDHash=Data.randomData(length: 6)
+		pairedEncryption.v1.pairedKeyEncryption.signedData=Data.randomData(length: 72)
+		try sendTransferSetupFrame(pairedEncryption)
+		
+		currentState = .sentPairedKeyEncryption
+	}
+	
+	private func processPairedKeyEncryption(frame:Sharing_Nearby_Frame) throws{
+		guard frame.hasV1, frame.v1.hasPairedKeyEncryption else { throw NearbyError.requiredFieldMissing }
+		var pairedResult=Sharing_Nearby_Frame()
+		pairedResult.version = .v1
+		pairedResult.v1=Sharing_Nearby_V1Frame()
+		pairedResult.v1.type = .pairedKeyResult
+		pairedResult.v1.pairedKeyResult=Sharing_Nearby_PairedKeyResultFrame()
+		pairedResult.v1.pairedKeyResult.status = .unable
+		try sendTransferSetupFrame(pairedResult)
+		currentState = .sentPairedKeyResult
+	}
+	
+	private func processPairedKeyResult(frame:Sharing_Nearby_Frame) throws{
+		guard frame.hasV1, frame.v1.hasPairedKeyResult else { throw NearbyError.requiredFieldMissing }
+		
+		var introduction=Sharing_Nearby_Frame()
+		introduction.version = .v1
+		introduction.v1.type = .introduction
+		if urlsToSend.count==1 && urlsToSend[0].scheme != "file"{
+			var meta=Sharing_Nearby_TextMetadata()
+			meta.type = .url
+			meta.textTitle=urlsToSend[0].host ?? "URL"
+			meta.size=Int64(urlsToSend[0].absoluteString.utf8.count)
+			meta.payloadID=Int64.random(in: Int64.min...Int64.max)
+			introduction.v1.introduction.textMetadata.append(meta)
+		}else{
+			for url in urlsToSend{
+				guard url.scheme=="file" else {continue}
+				var meta=Sharing_Nearby_FileMetadata()
+				meta.name=OutboundNearbyConnection.sanitizeFileName(name: url.lastPathComponent)
+				let attrs=try FileManager.default.attributesOfItem(atPath: url.path)
+				meta.size=(attrs[FileAttributeKey.size] as! NSNumber).int64Value
+				let typeID=try? url.resourceValues(forKeys: [.typeIdentifierKey]).typeIdentifier
+				meta.mimeType="application/octet-stream"
+				if let typeID=typeID{
+					let type=UTType(typeID)
+					if let type=type, let mimeType=type.preferredMIMEType{
+						meta.mimeType=mimeType
+					}
+				}
+				if meta.mimeType.starts(with: "image/"){
+					meta.type = .image
+				}else if meta.mimeType.starts(with: "video/"){
+					meta.type = .video
+				}else if(meta.mimeType.starts(with: "audio/")){
+					meta.type = .audio
+				}else if(url.pathExtension.lowercased()=="apk"){
+					meta.type = .app
+				}else{
+					meta.type = .unknown
+				}
+				meta.payloadID=Int64.random(in: Int64.min...Int64.max)
+				queue.append(OutgoingFileTransfer(url: url, payloadID: meta.payloadID, handle: try FileHandle(forReadingFrom: url), totalBytes: meta.size, currentOffset: 0))
+				introduction.v1.introduction.fileMetadata.append(meta)
+				totalBytesToSend+=meta.size
+			}
+		}
+		#if DEBUG
+		print("sent introduction: \(introduction)")
+		#endif
+		try sendTransferSetupFrame(introduction)
+		
+		currentState = .sentIntroduction
+	}
+	
+	private func processConsent(frame:Sharing_Nearby_Frame) throws{
+		guard frame.version == .v1, frame.v1.type == .response else {throw NearbyError.requiredFieldMissing}
+		switch frame.v1.connectionResponse.status{
+		case .accept:
+			currentState = .sendingFiles
+			delegate?.outboundConnectionTransferAccepted(connection: self)
+			try sendNextFileChunk()
+		case .reject, .unknown:
+			delegate?.outboundConnection(connection: self, failedWithError: NearbyError.canceled(reason: .userRejected))
+			try sendDisconnectionAndDisconnect()
+		case .notEnoughSpace:
+			delegate?.outboundConnection(connection: self, failedWithError: NearbyError.canceled(reason: .notEnoughSpace))
+			try sendDisconnectionAndDisconnect()
+		case .timedOut:
+			delegate?.outboundConnection(connection: self, failedWithError: NearbyError.canceled(reason: .timedOut))
+			try sendDisconnectionAndDisconnect()
+		case .unsupportedAttachmentType:
+			delegate?.outboundConnection(connection: self, failedWithError: NearbyError.canceled(reason: .unsupportedType))
+			try sendDisconnectionAndDisconnect()
+		}
+	}
+	
+	private func sendNextFileChunk() throws{
+		print("SEND NEXT: \(Thread.current)")
+		if cancelled{
+			return
+		}
+		if currentTransfer==nil || currentTransfer?.currentOffset==currentTransfer?.totalBytes{
+			if currentTransfer != nil && currentTransfer?.handle != nil{
+				try currentTransfer?.handle?.close()
+			}
+			if queue.isEmpty{
+				#if DEBUG
+				print("Disconnecting because all files have been transferred")
+				#endif
+				try sendDisconnectionAndDisconnect()
+				delegate?.outboundConnectionTransferFinished(connection: self)
+				return
+			}
+			currentTransfer=queue.removeFirst()
+		}
+		
+		guard let fileBuffer=try currentTransfer!.handle!.read(upToCount: 512*1024) else{
+			throw NearbyError.inputOutput(cause: Errno.ioError)
+		}
+		
+		var transfer=Location_Nearby_Connections_PayloadTransferFrame()
+		transfer.packetType = .data
+		transfer.payloadChunk.offset=currentTransfer!.currentOffset
+		transfer.payloadChunk.flags=0
+		transfer.payloadChunk.body=fileBuffer
+		transfer.payloadHeader.id=currentTransfer!.payloadID
+		transfer.payloadHeader.type = .file
+		transfer.payloadHeader.totalSize=Int64(currentTransfer!.totalBytes)
+		transfer.payloadHeader.isSensitive=false
+		currentTransfer!.currentOffset+=Int64(fileBuffer.count)
+		
+		var wrapper=Location_Nearby_Connections_OfflineFrame()
+		wrapper.version = .v1
+		wrapper.v1=Location_Nearby_Connections_V1Frame()
+		wrapper.v1.type = .payloadTransfer
+		wrapper.v1.payloadTransfer=transfer
+		try encryptAndSendOfflineFrame(wrapper, completion: {
+			do{
+				try self.sendNextFileChunk()
+			}catch{
+				self.lastError=error
+				self.protocolError()
+			}
+		})
+		#if DEBUG
+		print("sent file chunk, current transfer: \(String(describing: currentTransfer))")
+		#endif
+		totalBytesSent+=Int64(fileBuffer.count)
+		delegate?.outboundConnection(connection: self, transferProgress: Double(totalBytesSent)/Double(totalBytesToSend))
+		
+		if currentTransfer!.currentOffset==currentTransfer!.totalBytes{
+			// Signal end of file (yes, all this for one bit)
+			var transfer=Location_Nearby_Connections_PayloadTransferFrame()
+			transfer.packetType = .data
+			transfer.payloadChunk.offset=currentTransfer!.currentOffset
+			transfer.payloadChunk.flags=1 // <- this one here
+			transfer.payloadHeader.id=currentTransfer!.payloadID
+			transfer.payloadHeader.type = .file
+			transfer.payloadHeader.totalSize=Int64(currentTransfer!.totalBytes)
+			transfer.payloadHeader.isSensitive=false
+			
+			var wrapper=Location_Nearby_Connections_OfflineFrame()
+			wrapper.version = .v1
+			wrapper.v1=Location_Nearby_Connections_V1Frame()
+			wrapper.v1.type = .payloadTransfer
+			wrapper.v1.payloadTransfer=transfer
+			try encryptAndSendOfflineFrame(wrapper)
+			#if DEBUG
+			print("sent EOF, current transfer: \(String(describing: currentTransfer))")
+			#endif
+		}
+	}
+	
+	private static func sanitizeFileName(name:String)->String{
+		return name.replacingOccurrences(of: "[\\/\\\\?%\\*:\\|\"<>=]", with: "_", options: .regularExpression)
+	}
+}
+
+fileprivate struct OutgoingFileTransfer{
+	let url:URL
+	let payloadID:Int64
+	let handle:FileHandle?
+	let totalBytes:Int64
+	var currentOffset:Int64
+}
+
+protocol OutboundNearbyConnectionDelegate{
+	func outboundConnectionWasEstablished(connection:OutboundNearbyConnection)
+	func outboundConnection(connection:OutboundNearbyConnection, transferProgress:Double)
+	func outboundConnectionTransferAccepted(connection:OutboundNearbyConnection)
+	func outboundConnection(connection:OutboundNearbyConnection, failedWithError:Error)
+	func outboundConnectionTransferFinished(connection:OutboundNearbyConnection)
+}

PROTOCOL.md

@@ -59,6 +59,7 @@ sequenceDiagram
     Server->>Client: UKEY2 ServerInit
     Client->>Server: UKEY2 ClientFinish
     Server->>Client: Connection response
+    Client->>Server: Connection response
     Note over Server, Client: All following packets are encrypted
     Server->>Client: Paired key encryption
     Client->>Server: Paired key encryption
@@ -134,7 +135,7 @@ The **authentication string** is used for out-of-band key verification. Nearby S
 
 #### Connection response
 
-After the key exchange is complete, the server sends one last plaintext message to the client: a connection response. It's a subtype of offline frame saying that the server has accepted the connection. All the following communication is encrypted and wrapped in the payload layer.
+After the key exchange is complete, the server and client send each other one last plaintext message: a connection response. It's a subtype of offline frame saying that the other party has accepted the connection. All the following communication is encrypted and wrapped in the payload layer.
 
 ### The encryption layer
 

ShareExtension/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ShareExtension/Assets.xcassets/NearDropIcon.imageset/Contents.json

@@ -0,0 +1,22 @@
+{
+  "images" : [
+    {
+      "filename" : "16.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "32.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ShareExtension/Base.lproj/Localizable.stringsdict

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NFiles</key>
+	<dict>
+		<key>NSStringLocalizedFormatKey</key>
+		<string>%#@files@</string>
+		<key>files</key>
+		<dict>
+			<key>NSStringFormatSpecTypeKey</key>
+			<string>NSStringPluralRuleType</string>
+			<key>NSStringFormatValueTypeKey</key>
+			<string>d</string>
+			<key>one</key>
+			<string>%d file</string>
+			<key>other</key>
+			<string>%d files</string>
+		</dict>
+	</dict>
+</dict>
+</plist>

ShareExtension/Base.lproj/ShareViewController.xib

@@ -0,0 +1,264 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="21701" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="21701"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <customObject id="-2" userLabel="File's Owner" customClass="ShareViewController" customModule="ShareExtension" customModuleProvider="target">
+            <connections>
+                <outlet property="contentWrap" destination="ACO-U2-AZj" id="PAE-Pw-Vyx"/>
+                <outlet property="filesIcon" destination="afM-Om-nLQ" id="I58-a3-SBZ"/>
+                <outlet property="filesLabel" destination="OEz-QK-nem" id="his-3f-6kx"/>
+                <outlet property="largeProgress" destination="fCj-wF-rEj" id="jEg-Uc-Ur7"/>
+                <outlet property="listView" destination="gZI-Zb-Blx" id="VOC-3j-Pwy"/>
+                <outlet property="listViewWrapper" destination="A4d-Qt-PsT" id="8g5-VW-MIb"/>
+                <outlet property="loadingOverlay" destination="fLZ-IA-bPS" id="84g-Ef-GzW"/>
+                <outlet property="progressDeviceIcon" destination="84U-lB-SRB" id="LEL-BY-2FY"/>
+                <outlet property="progressDeviceIconWrap" destination="jBg-Ih-Gac" id="69x-6y-z0c"/>
+                <outlet property="progressDeviceName" destination="dJc-gw-4ux" id="ZE4-Kx-5hv"/>
+                <outlet property="progressDeviceSecondaryIcon" destination="BEO-kU-a2Q" id="iks-QR-2Od"/>
+                <outlet property="progressProgressBar" destination="J5x-hu-Kn5" id="vYH-DN-03b"/>
+                <outlet property="progressState" destination="y8I-D3-scQ" id="Tj3-xa-8VG"/>
+                <outlet property="progressView" destination="Q9K-dc-THx" id="LlE-4d-mI5"/>
+                <outlet property="view" destination="1" id="2"/>
+            </connections>
+        </customObject>
+        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
+        <customView translatesAutoresizingMaskIntoConstraints="NO" id="1">
+            <rect key="frame" x="0.0" y="0.0" width="404" height="248"/>
+            <subviews>
+                <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="NVE-vN-dkz">
+                    <rect key="frame" x="325" y="3" width="76" height="32"/>
+                    <constraints>
+                        <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="60" id="cP1-hK-9ZX"/>
+                    </constraints>
+                    <buttonCell key="cell" type="push" title="Cancel" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="6Up-t3-mwm">
+                        <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                        <font key="font" metaFont="system"/>
+                        <string key="keyEquivalent" base64-UTF8="YES">
+Gw
+</string>
+                    </buttonCell>
+                    <connections>
+                        <action selector="cancel:" target="-2" id="Qav-AK-DGt"/>
+                    </connections>
+                </button>
+                <stackView distribution="fill" orientation="horizontal" alignment="top" spacing="5" horizontalStackHuggingPriority="249.99998474121094" verticalStackHuggingPriority="249.99998474121094" detachesHiddenViews="YES" translatesAutoresizingMaskIntoConstraints="NO" id="1xF-vr-5sH">
+                    <rect key="frame" x="160" y="222" width="84" height="16"/>
+                    <subviews>
+                        <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="4M6-D5-WIf">
+                            <rect key="frame" x="0.0" y="0.0" width="16" height="16"/>
+                            <constraints>
+                                <constraint firstAttribute="width" constant="16" id="BOe-aZ-Njc"/>
+                                <constraint firstAttribute="height" constant="16" id="zLg-1a-wlZ"/>
+                            </constraints>
+                            <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" image="NearDropIcon" id="q3u-Am-ZIA"/>
+                        </imageView>
+                        <textField verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="aNc-0i-CWK">
+                            <rect key="frame" x="19" y="0.0" width="67" height="16"/>
+                            <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" alignment="left" title="NearDrop" allowsEditingTextAttributes="YES" id="0xp-rC-2gr">
+                                <font key="font" metaFont="systemBold"/>
+                                <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                                <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                            </textFieldCell>
+                        </textField>
+                    </subviews>
+                    <visibilityPriorities>
+                        <integer value="1000"/>
+                        <integer value="1000"/>
+                    </visibilityPriorities>
+                    <customSpacing>
+                        <real value="3.4028234663852886e+38"/>
+                        <real value="3.4028234663852886e+38"/>
+                    </customSpacing>
+                </stackView>
+                <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="afM-Om-nLQ">
+                    <rect key="frame" x="10" y="196" width="16" height="16"/>
+                    <constraints>
+                        <constraint firstAttribute="width" constant="16" id="3NE-mW-Jk0"/>
+                        <constraint firstAttribute="height" constant="16" id="koV-ob-gSn"/>
+                    </constraints>
+                    <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" id="jOq-9r-V1W"/>
+                </imageView>
+                <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" setsMaxLayoutWidthAtFirstLayout="YES" translatesAutoresizingMaskIntoConstraints="NO" id="OEz-QK-nem">
+                    <rect key="frame" x="29" y="196" width="367" height="16"/>
+                    <textFieldCell key="cell" lineBreakMode="truncatingMiddle" truncatesLastVisibleLine="YES" id="opy-Bj-x6u">
+                        <font key="font" metaFont="system"/>
+                        <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                        <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                    </textFieldCell>
+                </textField>
+                <customView translatesAutoresizingMaskIntoConstraints="NO" id="ACO-U2-AZj">
+                    <rect key="frame" x="0.0" y="40" width="404" height="146"/>
+                </customView>
+            </subviews>
+            <constraints>
+                <constraint firstItem="OEz-QK-nem" firstAttribute="top" secondItem="1xF-vr-5sH" secondAttribute="bottom" constant="10" id="852-oh-vM0"/>
+                <constraint firstItem="OEz-QK-nem" firstAttribute="leading" secondItem="afM-Om-nLQ" secondAttribute="trailing" constant="5" id="CIj-Dk-Md0"/>
+                <constraint firstAttribute="trailing" secondItem="ACO-U2-AZj" secondAttribute="trailing" id="HIg-sX-IK0"/>
+                <constraint firstItem="ACO-U2-AZj" firstAttribute="leading" secondItem="1" secondAttribute="leading" id="IGL-2g-wpe"/>
+                <constraint firstItem="afM-Om-nLQ" firstAttribute="leading" secondItem="1" secondAttribute="leading" constant="10" id="LK2-cg-qcY"/>
+                <constraint firstItem="NVE-vN-dkz" firstAttribute="top" secondItem="ACO-U2-AZj" secondAttribute="bottom" constant="10" id="RSD-PX-W0H"/>
+                <constraint firstAttribute="bottom" secondItem="NVE-vN-dkz" secondAttribute="bottom" constant="10" id="USG-Gg-of3"/>
+                <constraint firstAttribute="trailing" secondItem="NVE-vN-dkz" secondAttribute="trailing" constant="10" id="Z6U-4n-4tO"/>
+                <constraint firstItem="afM-Om-nLQ" firstAttribute="top" secondItem="1" secondAttribute="top" constant="36" id="fUG-kT-wb0"/>
+                <constraint firstItem="1xF-vr-5sH" firstAttribute="centerX" secondItem="1" secondAttribute="centerX" id="sCA-yf-S9L"/>
+                <constraint firstItem="1xF-vr-5sH" firstAttribute="top" secondItem="1" secondAttribute="top" constant="10" id="tFn-vk-9Cq"/>
+                <constraint firstAttribute="trailing" secondItem="OEz-QK-nem" secondAttribute="trailing" constant="10" id="vyd-BI-oDH"/>
+                <constraint firstItem="ACO-U2-AZj" firstAttribute="top" secondItem="OEz-QK-nem" secondAttribute="bottom" constant="10" id="x5r-wc-s4x"/>
+            </constraints>
+            <point key="canvasLocation" x="140" y="-36"/>
+        </customView>
+        <stackView wantsLayer="YES" distribution="equalSpacing" orientation="vertical" alignment="centerX" spacing="0.0" horizontalStackHuggingPriority="249.99998474121094" verticalStackHuggingPriority="249.99998474121094" detachesHiddenViews="YES" id="fLZ-IA-bPS">
+            <rect key="frame" x="0.0" y="0.0" width="521" height="100"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+            <subviews>
+                <progressIndicator maxValue="100" indeterminate="YES" style="spinning" translatesAutoresizingMaskIntoConstraints="NO" id="fCj-wF-rEj">
+                    <rect key="frame" x="245" y="68" width="32" height="32"/>
+                </progressIndicator>
+                <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="27P-yf-gUd">
+                    <rect key="frame" x="189" y="42" width="144" height="16"/>
+                    <textFieldCell key="cell" lineBreakMode="clipping" title="Looking for devices..." id="NaJ-Wx-Pim">
+                        <font key="font" textStyle="headline" name=".SFNS-Bold"/>
+                        <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                        <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                    </textFieldCell>
+                </textField>
+                <textField verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" translatesAutoresizingMaskIntoConstraints="NO" id="V5W-Rm-YVM">
+                    <rect key="frame" x="-2" y="0.0" width="525" height="32"/>
+                    <textFieldCell key="cell" alignment="center" title="If you don't see your device, open &quot;Files by Google&quot; app and tap &quot;Receive&quot; on the Nearby Share tab." id="vla-gF-eJo">
+                        <font key="font" metaFont="system"/>
+                        <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                        <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                    </textFieldCell>
+                </textField>
+            </subviews>
+            <constraints>
+                <constraint firstItem="27P-yf-gUd" firstAttribute="top" secondItem="fCj-wF-rEj" secondAttribute="bottom" constant="10" id="87W-ec-fMh"/>
+                <constraint firstItem="V5W-Rm-YVM" firstAttribute="top" secondItem="27P-yf-gUd" secondAttribute="bottom" constant="10" id="OSI-wI-LcY"/>
+            </constraints>
+            <visibilityPriorities>
+                <integer value="1000"/>
+                <integer value="1000"/>
+                <integer value="1000"/>
+            </visibilityPriorities>
+            <customSpacing>
+                <real value="3.4028234663852886e+38"/>
+                <real value="3.4028234663852886e+38"/>
+                <real value="3.4028234663852886e+38"/>
+            </customSpacing>
+            <point key="canvasLocation" x="660.5" y="-1.5"/>
+        </stackView>
+        <stackView wantsLayer="YES" distribution="equalSpacing" orientation="vertical" alignment="centerX" spacing="1" horizontalStackHuggingPriority="249.99998474121094" verticalStackHuggingPriority="249.99998474121094" detachesHiddenViews="YES" id="Q9K-dc-THx">
+            <rect key="frame" x="0.0" y="0.0" width="384" height="130"/>
+            <autoresizingMask key="autoresizingMask"/>
+            <subviews>
+                <customView translatesAutoresizingMaskIntoConstraints="NO" id="jBg-Ih-Gac">
+                    <rect key="frame" x="168" y="82" width="48" height="48"/>
+                    <subviews>
+                        <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="84U-lB-SRB">
+                            <rect key="frame" x="0.0" y="0.0" width="48" height="48"/>
+                            <constraints>
+                                <constraint firstAttribute="width" constant="48" id="9ld-k4-EkL"/>
+                                <constraint firstAttribute="height" constant="48" id="XA4-2k-hqR"/>
+                            </constraints>
+                            <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" id="rb3-78-PXe"/>
+                        </imageView>
+                        <imageView hidden="YES" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="BEO-kU-a2Q">
+                            <rect key="frame" x="24" y="-8" width="32" height="32"/>
+                            <constraints>
+                                <constraint firstAttribute="height" constant="32" id="05I-Ef-84Z"/>
+                                <constraint firstAttribute="width" constant="32" id="V0g-Fz-HWH"/>
+                            </constraints>
+                            <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" image="NSCaution" id="k1c-Xl-fTQ"/>
+                        </imageView>
+                    </subviews>
+                    <constraints>
+                        <constraint firstAttribute="trailing" secondItem="BEO-kU-a2Q" secondAttribute="trailing" constant="-8" id="59U-Zi-ESa"/>
+                        <constraint firstAttribute="bottom" secondItem="BEO-kU-a2Q" secondAttribute="bottom" constant="-8" id="8ty-pq-miR"/>
+                        <constraint firstItem="84U-lB-SRB" firstAttribute="top" secondItem="jBg-Ih-Gac" secondAttribute="top" id="MB9-UI-2mb"/>
+                        <constraint firstItem="84U-lB-SRB" firstAttribute="leading" secondItem="jBg-Ih-Gac" secondAttribute="leading" id="b23-hJ-aWT"/>
+                        <constraint firstAttribute="trailing" secondItem="84U-lB-SRB" secondAttribute="trailing" id="eKl-3V-K49"/>
+                        <constraint firstAttribute="bottom" secondItem="84U-lB-SRB" secondAttribute="bottom" id="uh8-T1-Vd8"/>
+                    </constraints>
+                </customView>
+                <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" setsMaxLayoutWidthAtFirstLayout="YES" translatesAutoresizingMaskIntoConstraints="NO" id="dJc-gw-4ux">
+                    <rect key="frame" x="-2" y="56" width="388" height="16"/>
+                    <textFieldCell key="cell" lineBreakMode="truncatingTail" alignment="center" id="QzI-qQ-OBb">
+                        <font key="font" metaFont="system"/>
+                        <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                        <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                    </textFieldCell>
+                </textField>
+                <progressIndicator maxValue="100" doubleValue="50" indeterminate="YES" style="bar" translatesAutoresizingMaskIntoConstraints="NO" id="J5x-hu-Kn5">
+                    <rect key="frame" x="92" y="25" width="200" height="22"/>
+                    <constraints>
+                        <constraint firstAttribute="width" constant="200" id="bM2-Ih-2UC"/>
+                    </constraints>
+                </progressIndicator>
+                <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="y8I-D3-scQ">
+                    <rect key="frame" x="165" y="0.0" width="54" height="16"/>
+                    <textFieldCell key="cell" lineBreakMode="clipping" id="Iin-UY-IE5">
+                        <font key="font" metaFont="system"/>
+                        <color key="textColor" name="secondaryLabelColor" catalog="System" colorSpace="catalog"/>
+                        <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                    </textFieldCell>
+                </textField>
+            </subviews>
+            <constraints>
+                <constraint firstItem="y8I-D3-scQ" firstAttribute="top" secondItem="J5x-hu-Kn5" secondAttribute="bottom" constant="10" id="4EB-xc-Qni"/>
+                <constraint firstItem="dJc-gw-4ux" firstAttribute="leading" secondItem="Q9K-dc-THx" secondAttribute="leading" id="IXP-am-A8h"/>
+                <constraint firstItem="J5x-hu-Kn5" firstAttribute="top" secondItem="dJc-gw-4ux" secondAttribute="bottom" constant="10" id="Zav-Ho-QEJ"/>
+                <constraint firstItem="dJc-gw-4ux" firstAttribute="top" secondItem="jBg-Ih-Gac" secondAttribute="bottom" constant="10" id="bIE-Es-ZbK"/>
+                <constraint firstAttribute="trailing" secondItem="dJc-gw-4ux" secondAttribute="trailing" id="bKd-Vz-YA1"/>
+            </constraints>
+            <visibilityPriorities>
+                <integer value="1000"/>
+                <integer value="1000"/>
+                <integer value="1000"/>
+                <integer value="1000"/>
+            </visibilityPriorities>
+            <customSpacing>
+                <real value="3.4028234663852886e+38"/>
+                <real value="3.4028234663852886e+38"/>
+                <real value="3.4028234663852886e+38"/>
+                <real value="3.4028234663852886e+38"/>
+            </customSpacing>
+            <point key="canvasLocation" x="4" y="-288"/>
+        </stackView>
+        <scrollView wantsLayer="YES" autohidesScrollers="YES" horizontalLineScroll="10" horizontalPageScroll="10" verticalLineScroll="10" verticalPageScroll="10" hasHorizontalScroller="NO" usesPredominantAxisScrolling="NO" id="A4d-Qt-PsT">
+            <rect key="frame" x="0.0" y="0.0" width="271" height="172"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+            <clipView key="contentView" id="cCr-8P-Lya">
+                <rect key="frame" x="1" y="1" width="269" height="170"/>
+                <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                <subviews>
+                    <collectionView id="gZI-Zb-Blx">
+                        <rect key="frame" x="0.0" y="0.0" width="269" height="170"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES"/>
+                        <collectionViewFlowLayout key="collectionViewLayout" minimumInteritemSpacing="10" minimumLineSpacing="10" id="ATS-Jd-odC">
+                            <size key="itemSize" width="50" height="50"/>
+                        </collectionViewFlowLayout>
+                        <color key="primaryBackgroundColor" name="controlBackgroundColor" catalog="System" colorSpace="catalog"/>
+                    </collectionView>
+                </subviews>
+            </clipView>
+            <scroller key="horizontalScroller" hidden="YES" wantsLayer="YES" verticalHuggingPriority="750" horizontal="YES" id="3j2-z3-G1e">
+                <rect key="frame" x="-100" y="-100" width="402" height="16"/>
+                <autoresizingMask key="autoresizingMask"/>
+            </scroller>
+            <scroller key="verticalScroller" hidden="YES" wantsLayer="YES" verticalHuggingPriority="750" horizontal="NO" id="wty-KV-JAg">
+                <rect key="frame" x="380" y="1" width="16" height="142"/>
+                <autoresizingMask key="autoresizingMask"/>
+            </scroller>
+            <point key="canvasLocation" x="-397.5" y="30"/>
+        </scrollView>
+    </objects>
+    <resources>
+        <image name="NSCaution" width="32" height="32"/>
+        <image name="NearDropIcon" width="16" height="16"/>
+    </resources>
+</document>

ShareExtension/DeviceListCell.swift

@@ -0,0 +1,26 @@
+//
+//  DeviceListCell.swift
+//  ShareExtension
+//
+//  Created by Grishka on 20.09.2023.
+//
+
+import Cocoa
+
+class DeviceListCell:NSCollectionViewItem {
+	public var clickHandler:(()->Void)?
+	
+    override func viewDidLoad() {
+        super.viewDidLoad()
+		let btn:NSButton=view as! NSButton
+		btn.isEnabled=true
+		btn.setButtonType(.momentaryPushIn)
+		btn.action=#selector(onClick)
+		btn.target=self
+    }
+	
+	@IBAction func onClick(_ sender:Any?){
+		guard let handler=clickHandler else {return}
+		handler()
+	}
+}

ShareExtension/DeviceListCell.xib

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="21701" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="21701"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <customObject id="-2" userLabel="File's Owner" customClass="DeviceListCell" customModule="ShareExtension" customModuleProvider="target">
+            <connections>
+                <outlet property="view" destination="Hz6-mo-xeY" id="gtq-ca-SBh"/>
+            </connections>
+        </customObject>
+        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
+        <customView misplaced="YES" id="Hz6-mo-xeY" customClass="NSButton">
+            <rect key="frame" x="0.0" y="0.0" width="206" height="82"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+            <subviews>
+                <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" setsMaxLayoutWidthAtFirstLayout="YES" translatesAutoresizingMaskIntoConstraints="NO" id="QPM-sE-maP">
+                    <rect key="frame" x="-2" y="0.0" width="210" height="32"/>
+                    <constraints>
+                        <constraint firstAttribute="height" constant="32" id="TBS-IE-2DT"/>
+                    </constraints>
+                    <textFieldCell key="cell" truncatesLastVisibleLine="YES" alignment="center" title="Label" id="cXi-mf-qP0">
+                        <font key="font" usesAppearanceFont="YES"/>
+                        <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                        <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                    </textFieldCell>
+                </textField>
+                <imageView horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="O1J-am-CoK">
+                    <rect key="frame" x="79" y="42" width="48" height="48"/>
+                    <constraints>
+                        <constraint firstAttribute="width" constant="48" id="KYr-2E-wCO"/>
+                        <constraint firstAttribute="height" constant="48" id="nik-I6-YgB"/>
+                    </constraints>
+                    <imageCell key="cell" refusesFirstResponder="YES" alignment="left" imageScaling="proportionallyDown" id="QGU-rR-rJQ"/>
+                </imageView>
+            </subviews>
+            <constraints>
+                <constraint firstItem="O1J-am-CoK" firstAttribute="centerX" secondItem="Hz6-mo-xeY" secondAttribute="centerX" id="R76-2L-pXb"/>
+                <constraint firstAttribute="bottom" secondItem="QPM-sE-maP" secondAttribute="bottom" id="Ryn-nY-yZp"/>
+                <constraint firstItem="O1J-am-CoK" firstAttribute="top" secondItem="Hz6-mo-xeY" secondAttribute="top" id="ZFA-S9-fpT"/>
+                <constraint firstAttribute="trailing" secondItem="QPM-sE-maP" secondAttribute="trailing" id="eOl-Va-HXq"/>
+                <constraint firstItem="QPM-sE-maP" firstAttribute="top" secondItem="O1J-am-CoK" secondAttribute="bottom" constant="10" id="leg-nD-mHB"/>
+                <constraint firstItem="QPM-sE-maP" firstAttribute="leading" secondItem="Hz6-mo-xeY" secondAttribute="leading" id="vvH-Hq-iUk"/>
+            </constraints>
+            <connections>
+                <action selector="onClick:" target="-2" id="mve-gp-q4i"/>
+            </connections>
+            <point key="canvasLocation" x="-60" y="150"/>
+        </customView>
+        <collectionViewItem id="1Lb-iJ-Nar" customClass="DeviceListCell" customModule="ShareExtension" customModuleProvider="target">
+            <connections>
+                <outlet property="imageView" destination="O1J-am-CoK" id="zQn-mV-bRy"/>
+                <outlet property="textField" destination="QPM-sE-maP" id="s0j-Qq-7iA"/>
+                <outlet property="view" destination="Hz6-mo-xeY" id="gZn-20-o77"/>
+            </connections>
+        </collectionViewItem>
+    </objects>
+</document>

ShareExtension/Info.plist

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionAttributes</key>
+		<dict>
+			<key>NSExtensionActivationRule</key>
+			<string>SUBQUERY (
+    extensionItems,
+    $extensionItem,
+    SUBQUERY (
+        $extensionItem.attachments,
+        $attachment,
+        ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.file-url"
+        AND NOT (ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.folder")
+    ).@count == $extensionItem.attachments.@count
+).@count &gt; 0</string>
+		</dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.share-services</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).ShareViewController</string>
+	</dict>
+</dict>
+</plist>

ShareExtension/ShareExtension.entitlements

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+	<key>com.apple.security.network.server</key>
+	<true/>
+</dict>
+</plist>

ShareExtension/ShareViewController.swift

@@ -0,0 +1,271 @@
+//
+//  ShareViewController.swift
+//  ShareExtension
+//
+//  Created by Grishka on 12.09.2023.
+//
+
+import Foundation
+import Cocoa
+import NearbyShare
+
+class ShareViewController: NSViewController, ShareExtensionDelegate{
+	
+	private var urls:[URL]=[]
+	private var foundDevices:[RemoteDeviceInfo]=[]
+	private var chosenDevice:RemoteDeviceInfo?
+	private var lastError:Error?
+	
+	@IBOutlet var filesIcon:NSImageView?
+	@IBOutlet var filesLabel:NSTextField?
+	@IBOutlet var loadingOverlay:NSStackView?
+	@IBOutlet var largeProgress:NSProgressIndicator?
+	@IBOutlet var listView:NSCollectionView?
+	@IBOutlet var listViewWrapper:NSView?
+	@IBOutlet var contentWrap:NSView?
+	@IBOutlet var progressView:NSView?
+	@IBOutlet var progressDeviceIcon:NSImageView?
+	@IBOutlet var progressDeviceName:NSTextField?
+	@IBOutlet var progressProgressBar:NSProgressIndicator?
+	@IBOutlet var progressState:NSTextField?
+	@IBOutlet var progressDeviceIconWrap:NSView?
+	@IBOutlet var progressDeviceSecondaryIcon:NSImageView?
+	
+	override var nibName: NSNib.Name? {
+		return NSNib.Name("ShareViewController")
+	}
+
+	override func loadView() {
+		super.loadView()
+	
+		// Insert code here to customize the view
+		let item = self.extensionContext!.inputItems[0] as! NSExtensionItem
+			if let attachments = item.attachments {
+			for attachment in attachments as NSArray{
+				let provider=attachment as! NSItemProvider
+				provider.loadItem(forTypeIdentifier: kUTTypeURL as String) { data, err in
+					if let url=URL(dataRepresentation: data as! Data, relativeTo: nil, isAbsolute: false){
+						self.urls.append(url)
+						if self.urls.count==attachments.count{
+							DispatchQueue.main.async {
+								self.urlsReady()
+							}
+						}
+					}
+				}
+			}
+		} else {
+			let cancelError = NSError(domain: NSCocoaErrorDomain, code: NSUserCancelledError, userInfo: nil)
+			self.extensionContext!.cancelRequest(withError: cancelError)
+			return
+		}
+		
+		contentWrap!.addSubview(listViewWrapper!)
+		contentWrap!.addSubview(loadingOverlay!)
+		contentWrap!.addSubview(progressView!)
+		progressView!.isHidden=true
+		
+		listViewWrapper!.translatesAutoresizingMaskIntoConstraints=false
+		loadingOverlay!.translatesAutoresizingMaskIntoConstraints=false
+		progressView!.translatesAutoresizingMaskIntoConstraints=false
+		NSLayoutConstraint.activate([
+			NSLayoutConstraint(item: listViewWrapper!, attribute: .width, relatedBy: .equal, toItem: contentWrap, attribute: .width, multiplier: 1, constant: 0),
+			NSLayoutConstraint(item: listViewWrapper!, attribute: .height, relatedBy: .equal, toItem: contentWrap, attribute: .height, multiplier: 1, constant: 0),
+			
+			NSLayoutConstraint(item: loadingOverlay!, attribute: .width, relatedBy: .equal, toItem: contentWrap, attribute: .width, multiplier: 1, constant: 0),
+			NSLayoutConstraint(item: loadingOverlay!, attribute: .centerY, relatedBy: .equal, toItem: contentWrap, attribute: .centerY, multiplier: 1, constant: 0),
+			
+			NSLayoutConstraint(item: progressView!, attribute: .width, relatedBy: .equal, toItem: contentWrap, attribute: .width, multiplier: 1, constant: 0),
+			NSLayoutConstraint(item: progressView!, attribute: .centerY, relatedBy: .equal, toItem: contentWrap, attribute: .centerY, multiplier: 1, constant: 0)
+		])
+		
+		largeProgress!.startAnimation(nil)
+		let flowLayout=NSCollectionViewFlowLayout()
+		flowLayout.itemSize=NSSize(width: 75, height: 90)
+		flowLayout.sectionInset=NSEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
+		flowLayout.minimumInteritemSpacing=10
+		flowLayout.minimumLineSpacing=10
+		listView!.collectionViewLayout=flowLayout
+		listView!.dataSource=self
+		
+		progressDeviceIconWrap!.wantsLayer=true
+		progressDeviceIconWrap!.layer!.masksToBounds=false
+	}
+	
+	override func viewDidLoad(){
+		super.viewDidLoad()
+		NearbyConnectionManager.shared.startDeviceDiscovery()
+		NearbyConnectionManager.shared.addShareExtensionDelegate(self)
+	}
+	
+	override func viewWillDisappear() {
+		if chosenDevice==nil{
+			NearbyConnectionManager.shared.stopDeviceDiscovery()
+		}
+		NearbyConnectionManager.shared.removeShareExtensionDelegate(self)
+	}
+
+	@IBAction func cancel(_ sender: AnyObject?) {
+		if let device=chosenDevice{
+			NearbyConnectionManager.shared.cancelOutgoingTransfer(id: device.id!)
+		}
+		let cancelError = NSError(domain: NSCocoaErrorDomain, code: NSUserCancelledError, userInfo: nil)
+		self.extensionContext!.cancelRequest(withError: cancelError)
+	}
+	
+	private func urlsReady(){
+		for url in urls{
+			if url.isFileURL{
+				var isDirectory=UnsafeMutablePointer<ObjCBool>.allocate(capacity: 1)
+				if FileManager.default.fileExists(atPath: url.path, isDirectory: isDirectory) && isDirectory.pointee.boolValue{
+					print("Canceling share request because URL \(url) is a directory")
+					let cancelError = NSError(domain: NSCocoaErrorDomain, code: NSUserCancelledError, userInfo: nil)
+					self.extensionContext!.cancelRequest(withError: cancelError)
+					return
+				}
+			}
+		}
+		if urls.count==1{
+			if urls[0].isFileURL{
+				filesLabel!.stringValue=urls[0].lastPathComponent
+				filesIcon!.image=NSWorkspace.shared.icon(forFile: urls[0].path)
+			}else if urls[0].scheme=="http" || urls[0].scheme=="https"{
+				filesLabel!.stringValue=urls[0].absoluteString
+				filesIcon!.image=NSImage(named: NSImage.networkName)
+			}
+		}else{
+			filesLabel!.stringValue=String.localizedStringWithFormat(NSLocalizedString("NFiles", value: "%d files", comment: ""), urls.count)
+			filesIcon!.image=NSImage(named: NSImage.multipleDocumentsName)
+		}
+	}
+	
+	func addDevice(device: RemoteDeviceInfo) {
+		if foundDevices.isEmpty{
+			loadingOverlay?.animator().isHidden=true
+		}
+		foundDevices.append(device)
+		listView?.animator().insertItems(at: [[0, foundDevices.count-1]])
+	}
+	
+	func removeDevice(id: String){
+		if chosenDevice != nil{
+			return
+		}
+		for i in foundDevices.indices{
+			if foundDevices[i].id==id{
+				foundDevices.remove(at: i)
+				listView?.animator().deleteItems(at: [[0, i]])
+				break
+			}
+		}
+		if foundDevices.isEmpty{
+			loadingOverlay?.animator().isHidden=false
+		}
+	}
+	
+	func connectionWasEstablished(pinCode: String) {
+		progressState?.stringValue=String(format:NSLocalizedString("PinCode", value: "PIN: %@", comment: ""), arguments: [pinCode])
+		progressProgressBar?.isIndeterminate=false
+		progressProgressBar?.maxValue=1000
+		progressProgressBar?.doubleValue=0
+	}
+	
+	func connectionFailed(with error: Error) {
+		progressProgressBar?.isIndeterminate=false
+		progressProgressBar?.maxValue=1000
+		progressProgressBar?.doubleValue=0
+		lastError=error
+		if let ne=(error as? NearbyError), case let .canceled(reason)=ne{
+			switch reason{
+			case .userRejected:
+				progressState?.stringValue=NSLocalizedString("TransferDeclined", value: "Declined", comment: "")
+			case .userCanceled:
+				progressState?.stringValue=NSLocalizedString("TransferCanceled", value: "Canceled", comment: "")
+			case .notEnoughSpace:
+				progressState?.stringValue=NSLocalizedString("NotEnoughSpace", value: "Not enough disk space", comment: "")
+			case .unsupportedType:
+				progressState?.stringValue=NSLocalizedString("UnsupportedType", value: "Attachment type not supported", comment: "")
+			case .timedOut:
+				progressState?.stringValue=NSLocalizedString("TransferTimedOut", value: "Timed out", comment: "")
+			}
+			progressDeviceSecondaryIcon?.isHidden=false
+			dismissDelayed()
+		}else{
+			let alert=NSAlert(error: error)
+			alert.beginSheetModal(for: view.window!) { resp in
+				self.extensionContext!.cancelRequest(withError: error)
+			}
+		}
+	}
+	
+	func transferAccepted() {
+		progressState?.stringValue=NSLocalizedString("Sending", value: "Sending...", comment: "")
+	}
+	
+	func transferProgress(progress: Double) {
+		progressProgressBar!.doubleValue=progress*progressProgressBar!.maxValue
+	}
+	
+	func transferFinished() {
+		progressState?.stringValue=NSLocalizedString("TransferFinished", value: "Transfer finished", comment: "")
+		dismissDelayed()
+	}
+	
+	func selectDevice(device:RemoteDeviceInfo){
+		NearbyConnectionManager.shared.stopDeviceDiscovery()
+		listViewWrapper?.animator().isHidden=true
+		progressView?.animator().isHidden=false
+		progressDeviceName?.stringValue=device.name
+		progressDeviceIcon?.image=imageForDeviceType(type: device.type)
+		progressProgressBar?.startAnimation(nil)
+		progressState?.stringValue=NSLocalizedString("Connecting", value: "Connecting...", comment: "")
+		chosenDevice=device
+		NearbyConnectionManager.shared.startOutgoingTransfer(deviceID: device.id!, delegate: self, urls: urls)
+	}
+	
+	private func dismissDelayed(){
+		DispatchQueue.main.asyncAfter(deadline: .now()+2.0){
+			if let error=self.lastError{
+				self.extensionContext!.cancelRequest(withError: error)
+			}else{
+				self.extensionContext!.completeRequest(returningItems: nil, completionHandler: nil)
+			}
+		}
+	}
+}
+
+fileprivate func imageForDeviceType(type:RemoteDeviceInfo.DeviceType)->NSImage{
+	let imageName:String
+	switch type{
+	case .tablet:
+		imageName="com.apple.ipad"
+	case .computer:
+		imageName="com.apple.macbookpro-13-unibody"
+	default: // also .phone
+		imageName="com.apple.iphone"
+	}
+	return NSImage(contentsOfFile: "/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/\(imageName).icns")!
+}
+
+extension ShareViewController:NSCollectionViewDataSource{
+	func numberOfSections(in collectionView: NSCollectionView) -> Int {
+		return 1
+	}
+	
+	func collectionView(_ collectionView: NSCollectionView, numberOfItemsInSection section: Int) -> Int {
+		return foundDevices.count
+	}
+	
+	func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
+		let item=collectionView.makeItem(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "DeviceListCell"), for: indexPath)
+		guard let collectionViewItem = item as? DeviceListCell else {return item}
+		let device=foundDevices[indexPath[1]]
+		collectionViewItem.textField?.stringValue=device.name
+		collectionViewItem.imageView?.image=imageForDeviceType(type: device.type)
+		// TODO maybe there's a better way to handle clicks on collection view items? I'm still new to Apple's way of doing UIs so I may do dumb shit occasionally
+		collectionViewItem.clickHandler={
+			self.selectDevice(device: device)
+		}
+		return collectionViewItem
+	}
+}

ShareExtension/ru.lproj/Localizable.stringsdict

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NFiles</key>
+	<dict>
+		<key>NSStringLocalizedFormatKey</key>
+		<string>%#@files@</string>
+		<key>files</key>
+		<dict>
+			<key>NSStringFormatSpecTypeKey</key>
+			<string>NSStringPluralRuleType</string>
+			<key>NSStringFormatValueTypeKey</key>
+			<string>d</string>
+			<key>one</key>
+			<string>%d файл</string>
+			<key>few</key>
+			<string>%d файла</string>
+			<key>many</key>
+			<string>%d файлов</string>
+			<key>other</key>
+			<string>%d файлов</string>
+		</dict>
+	</dict>
+</dict>
+</plist>

ShareExtension/ru.lproj/ShareViewController.strings

@@ -0,0 +1,12 @@
+
+/* Class = "NSTextFieldCell"; title = "NearDrop"; ObjectID = "0xp-rC-2gr"; */
+"0xp-rC-2gr.title" = "NearDrop";
+
+/* Class = "NSButtonCell"; title = "Cancel"; ObjectID = "6Up-t3-mwm"; */
+"6Up-t3-mwm.title" = "Отменить";
+
+/* Class = "NSTextFieldCell"; title = "Looking for devices..."; ObjectID = "NaJ-Wx-Pim"; */
+"NaJ-Wx-Pim.title" = "Ищу устройства...";
+
+/* Class = "NSTextFieldCell"; title = "If you don't see your device, open \"Files by Google\" app and tap \"Receive\" on the Nearby Share tab."; ObjectID = "vla-gF-eJo"; */
+"vla-gF-eJo.title" = "Если Вы не видите своё устройство, откройте приложение \"Google Files\" и нажмите \"Получить\" на вкладке Обмен.";