Fix "lose messages received while in background"

A moved legacy DB has the NSFileProtectionClassComplete, meaning it's
never accessible while the device is locked.

// FREEBIE

SignalServiceKit/src/Util/OWSFileSystem.h

@@ -9,6 +9,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (instancetype)init NS_UNAVAILABLE;
 
 + (BOOL)protectFileOrFolderAtPath:(NSString *)path;
++ (BOOL)protectRecursiveContentsAtPath:(NSString *)path;
 
 + (NSString *)appDocumentDirectoryPath;
 
@@ -36,6 +37,7 @@ NS_ASSUME_NONNULL_BEGIN
 + (nullable NSString *)writeDataToTemporaryFile:(NSData *)data fileExtension:(NSString *_Nullable)fileExtension;
 
 + (nullable NSNumber *)fileSizeOfPath:(NSString *)filePath;
++ (void)logAttributesOfItemAtPathRecursively:(NSString *)path;
 
 @end
 

SignalServiceKit/src/Util/OWSFileSystem.m

@@ -9,8 +9,34 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSFileSystem
 
++ (BOOL)protectRecursiveContentsAtPath:(NSString *)path
+{
+    BOOL isDirectory;
+    if (![NSFileManager.defaultManager fileExistsAtPath:path isDirectory:&isDirectory]) {
+        return NO;
+    }
+
+    if (!isDirectory) {
+        [self protectFileOrFolderAtPath:path];
+    }
+    NSString *dirPath = path;
+
+    BOOL success = YES;
+    NSDirectoryEnumerator *directoryEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:dirPath];
+
+    for (NSString *relativePath in directoryEnumerator) {
+        NSString *filePath = [dirPath stringByAppendingPathComponent:relativePath];
+        DDLogDebug(@"%@ path: %@ had attributes: %@", self.logTag, filePath, directoryEnumerator.fileAttributes);
+
+        success = success && [self protectFileOrFolderAtPath:filePath];
+    }
+
+    return success;
+}
+
 + (BOOL)protectFileOrFolderAtPath:(NSString *)path
 {
+    DDLogVerbose(@"%@ protecting file at path: %@", self.logTag, path);
     if (![NSFileManager.defaultManager fileExistsAtPath:path]) {
         return NO;
     }
@@ -32,6 +58,33 @@ NS_ASSUME_NONNULL_BEGIN
     return YES;
 }
 
++ (void)logAttributesOfItemAtPath:(NSString *)path
+{
+    NSDictionary<NSFileAttributeKey, id> *_Nullable attributes = [self attributesOfItemAtPath:path];
+    DDLogDebug(@"%@ path: %@ has attributes: %@", self.logTag, path, attributes);
+}
+
++ (nullable NSDictionary<NSFileAttributeKey, id> *)attributesOfItemAtPath:(NSString *)path
+{
+    return [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
+}
+
++ (void)logAttributesOfItemAtPathRecursively:(NSString *)path
+{
+    BOOL isDirectory;
+    BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath:path isDirectory:&isDirectory];
+    OWSAssert(exists);
+
+    if (isDirectory) {
+        NSDirectoryEnumerator *directoryEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:(NSString *)path];
+        for (NSString *path in directoryEnumerator) {
+            DDLogDebug(@"%@ path: %@ has attributes: %@", self.logTag, path, directoryEnumerator.fileAttributes);
+        }
+    } else {
+        [self logAttributesOfItemAtPath:path];
+    }
+}
+
 + (NSString *)appDocumentDirectoryPath
 {
     NSFileManager *fileManager = [NSFileManager defaultManager];
@@ -93,6 +146,9 @@ NS_ASSUME_NONNULL_BEGIN
         oldFilePath,
         newFilePath,
         fabs([startDate timeIntervalSinceNow]));
+
+    // Ensure all files moved have the proper data protection class.
+    [self protectRecursiveContentsAtPath:newFilePath];
 }
 
 + (BOOL)ensureDirectoryExists:(NSString *)dirPath