Remove legacy code related to orma.in where files could be unencrypted

lib/models/file.dart

@@ -12,7 +12,6 @@ class File {
   String localID;
   String title;
   String deviceFolder;
-  bool isEncrypted;
   int creationTime;
   int modificationTime;
   int updationTime;
@@ -44,7 +43,6 @@ class File {
         file.fileType = FileType.other;
         break;
     }
-    file.isEncrypted = false;
     file.creationTime = asset.createDateTime.microsecondsSinceEpoch;
     if (file.creationTime == 0) {
       try {

lib/ui/video_widget.dart

@@ -55,32 +55,19 @@ class _VideoWidgetState extends State<VideoWidget> {
   }
 
   void _loadNetworkVideo() {
-    if (!widget.file.isEncrypted) {
-      _setVideoPlayerController(url: widget.file.getStreamUrl());
-      _videoPlayerController.addListener(() {
-        if (_videoPlayerController.value.hasError) {
-          _logger.warning(_videoPlayerController.value.errorDescription);
-          showToast(
-              "the video has not been processed yet. downloading the original one...",
-              toastLength: Toast.LENGTH_SHORT);
-          _setVideoPlayerController(url: widget.file.getDownloadUrl());
-        }
-      });
-    } else {
-      getFileFromServer(
-        widget.file,
-        progressCallback: (count, total) {
-          setState(() {
-            _progress = count / total;
-            if (_progress == 1) {
-              showToast("decrypting video...", toastLength: Toast.LENGTH_SHORT);
-            }
-          });
-        },
-      ).then((file) {
-        _setVideoPlayerController(file: file);
-      });
-    }
+    getFileFromServer(
+      widget.file,
+      progressCallback: (count, total) {
+        setState(() {
+          _progress = count / total;
+          if (_progress == 1) {
+            showToast("decrypting video...", toastLength: Toast.LENGTH_SHORT);
+          }
+        });
+      },
+    ).then((file) {
+      _setVideoPlayerController(file: file);
+    });
   }
 
   @override

lib/utils/file_downloader.dart

@@ -57,7 +57,6 @@ class DiffFetcher {
                 continue;
               }
               file.ownerID = item["ownerID"];
-              file.isEncrypted = true;
               file.encryptedKey = item["encryptedKey"];
               file.keyDecryptionNonce = item["keyDecryptionNonce"];
               file.fileDecryptionHeader = item["file"]["decryptionHeader"];

lib/utils/file_util.dart

@@ -169,53 +169,40 @@ Future<io.File> getFileFromServer(File file,
   final cacheManager = file.fileType == FileType.video
       ? VideoCacheManager()
       : DefaultCacheManager();
-  if (!file.isEncrypted) {
-    return cacheManager.getSingleFile(file.getDownloadUrl());
-  } else {
-    return cacheManager.getFileFromCache(file.getDownloadUrl()).then((info) {
-      if (info == null) {
-        if (!fileDownloadsInProgress.containsKey(file.uploadedFileID)) {
-          fileDownloadsInProgress[file.uploadedFileID] = _downloadAndDecrypt(
-            file,
-            cacheManager,
-            progressCallback: progressCallback,
-          );
-        }
-        return fileDownloadsInProgress[file.uploadedFileID];
-      } else {
-        return info.file;
+  return cacheManager.getFileFromCache(file.getDownloadUrl()).then((info) {
+    if (info == null) {
+      if (!fileDownloadsInProgress.containsKey(file.uploadedFileID)) {
+        fileDownloadsInProgress[file.uploadedFileID] = _downloadAndDecrypt(
+          file,
+          cacheManager,
+          progressCallback: progressCallback,
+        );
       }
-    });
-  }
+      return fileDownloadsInProgress[file.uploadedFileID];
+    } else {
+      return info.file;
+    }
+  });
 }
 
 Future<io.File> getThumbnailFromServer(File file) async {
-  if (!file.isEncrypted) {
-    return ThumbnailCacheManager()
-        .getSingleFile(file.getThumbnailUrl())
-        .then((data) {
-      ThumbnailFileLruCache.put(file, data);
-      return data;
-    });
-  } else {
-    return ThumbnailCacheManager()
-        .getFileFromCache(file.getThumbnailUrl())
-        .then((info) {
-      if (info == null) {
-        if (!thumbnailDownloadsInProgress.containsKey(file.uploadedFileID)) {
-          thumbnailDownloadsInProgress[file.uploadedFileID] =
-              _downloadAndDecryptThumbnail(file).then((data) {
-            ThumbnailFileLruCache.put(file, data);
-            return data;
-          });
-        }
-        return thumbnailDownloadsInProgress[file.uploadedFileID];
-      } else {
-        ThumbnailFileLruCache.put(file, info.file);
-        return info.file;
+  return ThumbnailCacheManager()
+      .getFileFromCache(file.getThumbnailUrl())
+      .then((info) {
+    if (info == null) {
+      if (!thumbnailDownloadsInProgress.containsKey(file.uploadedFileID)) {
+        thumbnailDownloadsInProgress[file.uploadedFileID] =
+            _downloadAndDecryptThumbnail(file).then((data) {
+          ThumbnailFileLruCache.put(file, data);
+          return data;
+        });
       }
-    });
-  }
+      return thumbnailDownloadsInProgress[file.uploadedFileID];
+    } else {
+      ThumbnailFileLruCache.put(file, info.file);
+      return info.file;
+    }
+  });
 }
 
 Future<io.File> _downloadAndDecrypt(File file, BaseCacheManager cacheManager,