feat(lib): Moved deletePhotos to use new PHAsset API and added an implementation for Android (#69)

* deletePhotos works in iOS

* Deletion works on Android.

* Removing unnecessary commented out code.

* Updated typescript typings.

* Made readme more accurate based on being able to retrieve failure from the iOS API.

* Let formatter run, also now rejecting the promise when there's any error on deletion on Android.

README.md

@@ -73,6 +73,7 @@ On Android permission is required to read the external storage. Add below line t
 * [`saveToCameraRoll`](#savetocameraroll)
 * [`save`](#save)
 * [`getPhotos`](#getphotos)
+* [`deletePhotos`](#deletephotos)
 
 ---
 
@@ -208,3 +209,23 @@ render() {
  );
 }
 ```  
+---
+### `deletePhotos()`
+
+```javascript
+CameraRoll.deletePhotos([uri]);
+```
+
+Requests deletion of photos in the camera roll.
+
+On Android, the uri must be a local image or video URI, such as `"file:///sdcard/img.png"`.
+
+On iOS, the uri can be any image URI (including local, remote asset-library and base64 data URIs) or a local video file URI. The user is presented with a dialog box that shows them the asset(s) and asks them to confirm deletion. This is not able to be bypassed as per Apple Developer guidelines. 
+
+Returns a Promise which will resolve when the deletion request is completed, or reject if there is a problem during the deletion. On iOS the user is able to cancel the deletion request, which causes a rejection, while on Android the rejection will be due to a system error.
+
+**Parameters:**
+
+| Name | Type                   | Required | Description                                                |
+| ---- | ---------------------- | -------- | ---------------------------------------------------------- |
+| uri  | string                 | Yes      | See above.                                                 |

android/src/main/java/com/reactnativecommunity/cameraroll/CameraRollModule.java

@@ -8,6 +8,7 @@
 package com.reactnativecommunity.cameraroll;
 
 import android.content.ContentResolver;
+import android.content.ContentUris;
 import android.content.Context;
 import android.content.res.AssetFileDescriptor;
 import android.database.Cursor;
@@ -61,6 +62,7 @@ public class CameraRollModule extends ReactContextBaseJavaModule {
   private static final String ERROR_UNABLE_TO_LOAD = "E_UNABLE_TO_LOAD";
   private static final String ERROR_UNABLE_TO_LOAD_PERMISSION = "E_UNABLE_TO_LOAD_PERMISSION";
   private static final String ERROR_UNABLE_TO_SAVE = "E_UNABLE_TO_SAVE";
+  private static final String ERROR_UNABLE_TO_DELETE = "E_UNABLE_TO_DELETE";
   private static final String ERROR_UNABLE_TO_FILTER = "E_UNABLE_TO_FILTER";
 
   private static final String ASSET_TYPE_PHOTOS = "Photos";
@@ -504,4 +506,79 @@ public class CameraRollModule extends ReactContextBaseJavaModule {
       node.putMap("location", location);
     }
   }
+
+  /**
+   * Delete a set of images.
+   *
+   * @param uris array of file:// URIs of the images to delete
+   * @param promise to be resolved
+   */
+  @ReactMethod
+  public void deletePhotos(ReadableArray uris, Promise promise) {
+    if (uris.size() == 0) {
+      promise.reject(ERROR_UNABLE_TO_DELETE, "Need at least one URI to delete");
+    } else {
+      new DeletePhotos(getReactApplicationContext(), uris, promise)
+          .executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+    }
+  }
+
+  private static class DeletePhotos extends GuardedAsyncTask<Void, Void> {
+
+    private final Context mContext;
+    private final ReadableArray mUris;
+    private final Promise mPromise;
+
+    public DeletePhotos(ReactContext context, ReadableArray uris, Promise promise) {
+      super(context);
+      mContext = context;
+      mUris = uris;
+      mPromise = promise;
+    }
+
+    @Override
+    protected void doInBackgroundGuarded(Void... params) {
+      ContentResolver resolver = mContext.getContentResolver();
+
+      // Set up the projection (we only need the ID)
+      String[] projection = { MediaStore.Images.Media._ID };
+
+      // Match on the file path
+      String innerWhere = "?";
+      for (int i = 1; i < mUris.size(); i++) {
+        innerWhere += ", ?";
+      }
+
+      String selection = MediaStore.Images.Media.DATA + " IN (" + innerWhere + ")";
+      // Query for the ID of the media matching the file path
+      Uri queryUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
+
+      String[] selectionArgs = new String[mUris.size()];
+      for (int i = 0; i < mUris.size(); i++) {
+        Uri uri = Uri.parse(mUris.getString(i));
+        selectionArgs[i] = uri.getPath();
+      }
+
+      Cursor cursor = resolver.query(queryUri, projection, selection, selectionArgs, null);
+      int deletedCount = 0;
+
+      while (cursor.moveToNext()) {
+        long id = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID));
+        Uri deleteUri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
+
+        if (resolver.delete(deleteUri, null, null) == 1) {
+          deletedCount++;
+        }
+      }
+
+      cursor.close();
+
+      if (deletedCount == mUris.size()) {
+        mPromise.resolve(null);
+      } else {
+        mPromise.reject(ERROR_UNABLE_TO_DELETE,
+            "Could not delete all media, only deleted " + deletedCount + " photos.");
+      }
+    }
+  }
 }

ios/RNCCameraRollManager.m

@@ -367,12 +367,17 @@ RCT_EXPORT_METHOD(deletePhotos:(NSArray<NSString *>*)assets
                   resolve:(RCTPromiseResolveBlock)resolve
                   reject:(RCTPromiseRejectBlock)reject)
 {
-  NSArray<NSURL *> *assets_ = [RCTConvert NSURLArray:assets];
-  [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
-    PHFetchResult<PHAsset *> *fetched =
-    [PHAsset fetchAssetsWithALAssetURLs:assets_ options:nil];
-    [PHAssetChangeRequest deleteAssets:fetched];
+  NSMutableArray *convertedAssets = [NSMutableArray array];
+  
+  for (NSString *asset in assets) {
+    [convertedAssets addObject: [asset stringByReplacingOccurrencesOfString:@"ph://" withString:@""]];
   }
+
+  [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
+      PHFetchResult<PHAsset *> *fetched =
+        [PHAsset fetchAssetsWithLocalIdentifiers:convertedAssets options:nil];
+      [PHAssetChangeRequest deleteAssets:fetched];
+    }
   completionHandler:^(BOOL success, NSError *error) {
     if (success == YES) {
       resolve(@(success));

js/CameraRoll.js

@@ -123,8 +123,13 @@ class CameraRoll {
     return this.saveToCameraRoll(tag, 'photo');
   }
 
-  static deletePhotos(photos: Array<string>) {
-    return RNCCameraRoll.deletePhotos(photos);
+  /**
+   * On iOS: requests deletion of a set of photos from the camera roll.
+   * On Android: Deletes a set of photos from the camera roll.
+   *
+   */
+  static deletePhotos(photoUris: Array<string>) {
+    return RNCCameraRoll.deletePhotos(photoUris);
   }
 
   /**

typings/CameraRoll.d.ts

@@ -71,11 +71,10 @@ declare namespace CameraRoll {
     function saveImageWithTag(tag: string): Promise<string>;
 
     /**
-     * Delete a photo from the camera roll or media library. photos is an array of photo uri's.
+     * Delete a photo from the camera roll or media library. photoUris is an array of photo uri's.
      */
-    function deletePhotos(photos: Array<string>): void;
-    // deletePhotos: (photos: Array<string>) => void;
-
+    function deletePhotos(photoUris: Array<string>): void;
+    
     /**
      * Saves the photo or video to the camera roll or photo library.
      */