avoid incorrect default directory on iOS/macOS

- to be extra safe

(see <storesafe#907>)

- ensure that default "nosync" directory *always* has resource value
  set for `NSURLIsExcludedFromBackupKey`
- add more checks for missing database directory

Author: Christopher J. Brody

CHANGES.md

@@ -2,7 +2,9 @@
 
 #### cordova-sqlite-storage 5.0.0-dev
 
-TBD
+- avoid incorrect default directory on iOS/macOS - to be extra safe (see <https://github.com/xpbrew/cordova-sqlite-storage/issues/907>)
+  - ensure that default "nosync" directory *always* has resource value set for `NSURLIsExcludedFromBackupKey`
+  - add more checks for missing database directory
 
 #### cordova-sqlite-storage 4.0.0
 

src/ios/SQLitePlugin.m

@@ -51,29 +51,48 @@ -(void)pluginInitialize
 
         NSString *nosync = [libs stringByAppendingPathComponent:@"LocalDatabase"];
         NSError *err;
+
+        // GENERAL NOTE: no `nosync` directory path entry to be added
+        // to appDBPaths map in case of any isses creating the
+        // required directory or setting the resource value for
+        // NSURLIsExcludedFromBackupKey
+        //
+        // This is to avoid potential for issue raised here:
+        // https://github.com/xpbrew/cordova-sqlite-storage/issues/907
+
         if ([[NSFileManager defaultManager] fileExistsAtPath: nosync])
         {
-            DLog(@"no cloud sync at path: %@", nosync);
-            [appDBPaths setObject: nosync forKey:@"nosync"];
+            DLog(@"no cloud sync directory already exists at path: %@", nosync);
         }
         else
         {
             if ([[NSFileManager defaultManager] createDirectoryAtPath: nosync withIntermediateDirectories:NO attributes: nil error:&err])
             {
+                DLog(@"no cloud sync directory created with path: %@", nosync);
+            }
+            else
+            {
+                // STOP HERE & LOG WITH INTERNAL PLUGIN ERROR:
+                NSLog(@"INTERNAL PLUGIN ERROR: could not create no cloud sync directory at path: %@", nosync);
+                return;
+            }
+        }
+
+        {
+            {
+                // Set the resource value for NSURLIsExcludedFromBackupKey
                 NSURL *nosyncURL = [ NSURL fileURLWithPath: nosync];
                 if (![nosyncURL setResourceValue: [NSNumber numberWithBool: YES] forKey: NSURLIsExcludedFromBackupKey error: &err])
                 {
-                    DLog(@"IGNORED: error setting nobackup flag in LocalDatabase directory: %@", err);
+                    // STOP HERE & LOG WITH INTERNAL PLUGIN ERROR:
+                    NSLog(@"INTERNAL PLUGIN ERROR: error setting nobackup flag in LocalDatabase directory: %@", err);
+                    return;
                 }
+
+                // now ready to add `nosync` entry to appDBPaths:
                 DLog(@"no cloud sync at path: %@", nosync);
                 [appDBPaths setObject: nosync forKey:@"nosync"];
             }
-            else
-            {
-                // fallback:
-                DLog(@"WARNING: error adding LocalDatabase directory: %@", err);
-                [appDBPaths setObject: libs forKey:@"nosync"];
-            }
         }
     }
 }
@@ -84,6 +103,11 @@ -(id) getDBPath:(NSString *)dbFile at:(NSString *)atkey {
     }
 
     NSString *dbdir = [appDBPaths objectForKey:atkey];
+    if (dbdir == NULL) {
+        // INTERNAL PLUGIN ERROR:
+        return NULL;
+    }
+
     NSString *dbPath = [dbdir stringByAppendingPathComponent: dbFile];
     return dbPath;
 }
@@ -244,6 +268,14 @@ -(void)deleteNow: (CDVInvokedUrlCommand*)command
     } else {
         NSString *dbPath = [self getDBPath:dbFileName at:dblocation];
 
+        if (dbPath == NULL) {
+            // INTERNAL PLUGIN ERROR - NOT EXPECTED:
+            NSLog(@"INTERNAL PLUGIN ERROR (NOT EXPECTED): delete with no valid database path found");
+            pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR messageAsString: @"INTERNAL PLUGIN ERROR: delete with no valid database path found"];
+            [self.commandDelegate sendPluginResult:pluginResult callbackId: command.callbackId];
+            return;
+        }
+
         if ([[NSFileManager defaultManager]fileExistsAtPath:dbPath]) {
             DLog(@"delete full db path: %@", dbPath);
             [[NSFileManager defaultManager]removeItemAtPath:dbPath error:nil];