ios: clear storage (#1069)

* wip

* display current storage state

* alert

* fix

* simplify

* remove unused function

* fix log

* replace prints with logger

* Apply suggestions from code review

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

* low res will remain text

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

apps/ios/Shared/Views/Database/DatabaseView.swift

@@ -17,6 +17,7 @@ enum DatabaseAlert: Identifiable {
     case deleteChat
     case chatDeleted
     case deleteLegacyDatabase
+    case deleteFilesAndMedia
     case error(title: LocalizedStringKey, error: String = "")
 
     var id: String {
@@ -28,6 +29,7 @@ enum DatabaseAlert: Identifiable {
         case .deleteChat: return "deleteChat"
         case .chatDeleted: return "chatDeleted"
         case .deleteLegacyDatabase: return "deleteLegacyDatabase"
+        case .deleteFilesAndMedia: return "deleteFilesAndMedia"
         case let .error(title, _): return "error \(title)"
         }
     }
@@ -46,6 +48,7 @@ struct DatabaseView: View {
     @State private var dbContainer = dbContainerGroupDefault.get()
     @State private var legacyDatabase = hasLegacyDatabase()
     @State private var useKeychain = storeDBPassphraseGroupDefault.get()
+    @State private var appFilesCountAndSize: (Int, Int)?
 
     var body: some View {
         ZStack {
@@ -147,8 +150,27 @@ struct DatabaseView: View {
                     }
                 }
             }
+
+            Section {
+                Button("Delete files & media", role: .destructive) {
+                    alert = .deleteFilesAndMedia
+                }
+            } header: {
+                Text("Files")
+            } footer: {
+                if let (fileCount, size) = appFilesCountAndSize {
+                    if fileCount == 0 {
+                        Text("No received or sent files")
+                    } else {
+                        Text("\(fileCount) file(s) with total size of \(ByteCountFormatter().string(fromByteCount: Int64(size)))")
+                    }
+                }
+            }
+        }
+        .onAppear {
+            runChat = m.chatRunning ?? true
+            appFilesCountAndSize = directoryFileCountAndSize(getAppFilesDirectory())
         }
-        .onAppear { runChat = m.chatRunning ?? true }
         .alert(item: $alert) { item in databaseAlert(item) }
         .fileImporter(
             isPresented: $showFileImporter,
@@ -222,6 +244,15 @@ struct DatabaseView: View {
                 },
                 secondaryButton: .cancel()
             )
+        case .deleteFilesAndMedia:
+            return Alert(
+                title: Text("Delete files and media?"),
+                message: Text("This action cannot be undone - all received and sent files and media will be deleted. Low resolution pictures will remain."),
+                primaryButton: .destructive(Text("Delete")) {
+                    deleteFiles()
+                },
+                secondaryButton: .cancel()
+            )
         case let .error(title, error):
             return Alert(title: Text(title), message: Text("\(error)"))
         }
@@ -354,6 +385,11 @@ struct DatabaseView: View {
             }
         }
     }
+
+    private func deleteFiles() {
+        deleteAppFiles()
+        appFilesCountAndSize = directoryFileCountAndSize(getAppFilesDirectory())
+    }
 }
 
 struct DatabaseView_Previews: PreviewProvider {

apps/ios/SimpleXChat/FileUtils.swift

@@ -61,6 +61,46 @@ func fileModificationDate(_ path: String) -> Date? {
     }
 }
 
+public func deleteAppFiles() {
+    let fm = FileManager.default
+    do {
+        let fileNames = try fm.contentsOfDirectory(atPath: getAppFilesDirectory().path)
+        for fileName in fileNames {
+            removeFile(fileName)
+        }
+    } catch {
+        logger.error("FileUtils deleteAppFiles error: \(error.localizedDescription)")
+    }
+}
+
+func fileSize(_ url: URL) -> Int? { // in bytes
+    do {
+        let val = try url.resourceValues(forKeys: [.totalFileAllocatedSizeKey, .fileAllocatedSizeKey])
+        return val.totalFileAllocatedSize ?? val.fileAllocatedSize
+    } catch {
+        logger.error("FileUtils fileSize error: \(error.localizedDescription)")
+        return nil
+    }
+}
+
+public func directoryFileCountAndSize(_ dir: URL) -> (Int, Int)? { // size in bytes
+    let fm = FileManager.default
+    if let enumerator = fm.enumerator(at: dir, includingPropertiesForKeys: [.totalFileAllocatedSizeKey, .fileAllocatedSizeKey], options: [], errorHandler: { (_, error) -> Bool in
+        logger.error("FileUtils directoryFileCountAndSize error: \(error.localizedDescription)")
+        return false
+    }) {
+        var fileCount = 0
+        var bytes = 0
+        for case let url as URL in enumerator {
+            fileCount += 1
+            bytes += fileSize(url) ?? 0
+        }
+        return (fileCount, bytes)
+    } else {
+        return nil
+    }
+}
+
 public func hasBackup(newerThan date: Date) -> Bool {
     let dbPath = getAppDatabasePath().path
     return hasBackupFile(dbPath + AGENT_DB_BAK, newerThan: date)