mobile: check if file exists based on file size

apps/mobile/app/common/filesystem/download.js

@@ -24,7 +24,7 @@ import { ToastEvent } from "../../services/event-manager";
 import { useAttachmentStore } from "../../stores/use-attachment-store";
 import { db } from "../database";
 import { cacheDir, fileCheck } from "./utils";
-import { createCacheDir } from "./io";
+import { createCacheDir, exists } from "./io";
 
 export async function downloadFile(filename, data, cancelToken) {
   if (!data) return false;
@@ -32,12 +32,10 @@ export async function downloadFile(filename, data, cancelToken) {
   await createCacheDir();
 
   let { url, headers } = data;
-
   let path = `${cacheDir}/${filename}`;
+
   try {
-    let exists = await RNFetchBlob.fs.exists(path);
-    if (exists) {
-      console.log("exists", filename);
+    if (await exists(filename)) {
       return true;
     }
 

apps/mobile/app/common/filesystem/io.js

@@ -31,18 +31,7 @@ export async function readEncrypted(filename, key, cipherData) {
   let path = `${cacheDir}/${filename}`;
 
   try {
-    const iosAppGroup =
-      Platform.OS === "ios"
-        ? await RNFetchBlob.fs.pathForAppGroup(IOS_APPGROUPID)
-        : null;
-
-    const appGroupPath = `${iosAppGroup}/${filename}`;
-    let exists =
-      (await RNFetchBlob.fs.exists(path)) ||
-      (Platform.OS === "ios" && (await RNFetchBlob.fs.exists(appGroupPath)));
-
-    if (!exists) {
-      console.log("Will download file...", filename);
+    if (!(await exists(filename))) {
       return false;
     } else {
       RNFetchBlob.fs.stat(path).then((r) => {
@@ -183,7 +172,42 @@ export async function migrateFilesFromCache() {
   }
 }
 
+const ABYTES = 17;
 export async function exists(filename) {
-  let exists = await RNFetchBlob.fs.exists(`${cacheDir}/${filename}`);
+  let path = `${cacheDir}/${filename}`;
+
+  const iosAppGroup =
+    Platform.OS === "ios"
+      ? await RNFetchBlob.fs.pathForAppGroup(IOS_APPGROUPID)
+      : null;
+  const appGroupPath = `${iosAppGroup}/${filename}`;
+
+  let exists = await RNFetchBlob.fs.exists(path);
+
+  // Check if file is present in app group path.
+  let existsInAppGroup = false;
+  if (!exists && Platform.OS === "ios") {
+    existsInAppGroup = await RNFetchBlob.fs.exists(appGroupPath);
+  }
+
+  if (exists || existsInAppGroup) {
+    const attachment = db.attachments.attachment(filename);
+    const totalChunks = Math.ceil(attachment.length / attachment.chunkSize);
+    const totalAbytes = totalChunks * ABYTES;
+    const expectedFileSize = attachment.length + totalAbytes;
+
+    const stat = await RNFetchBlob.fs.stat(
+      existsInAppGroup ? appGroupPath : path
+    );
+
+    if (stat.size !== expectedFileSize) {
+      RNFetchBlob.fs
+        .unlink(existsInAppGroup ? appGroupPath : path)
+        .catch(console.log);
+      return false;
+    }
+
+    exists = true;
+  }
   return exists;
 }

apps/mobile/app/screens/editor/progress.tsx

@@ -54,12 +54,13 @@ export const ProgressBar = () => {
     ? attachmentProgress?.[loading?.filename]
     : undefined;
 
-  console.log(loading);
-
   useEffect(() => {
     if (loading) {
-      if (loading.current === loading.total && loading.success) {
-        console.log("download completed");
+      console.log(loading);
+      if (
+        loading.current === loading.total &&
+        typeof loading.success === "boolean"
+      ) {
         clear();
         return;
       }

apps/mobile/app/stores/use-attachment-store.ts

@@ -27,6 +27,7 @@ export type AttachmentGroupProgress = {
   filename: string;
   canceled?: boolean;
   success?: boolean;
+  error?: any;
 };
 
 interface AttachmentStore {