Add support for an app:// (macOS)

CHANGELOG.md

@@ -3,7 +3,7 @@
 
 #### Version 0.8.7 (not yet released)
 - Add support for an app:// URL #158 (Android)
-- Add support for an app:// (iOS)
+- Add support for an app:// (iOS, macOS)
 
 #### Version 0.8.6 (12.06.2017)
 - Fixed issue with Android 4.x

src/osx/APPEmailComposerImpl.m

@@ -220,6 +220,10 @@ - (NSArray*) getAttachments:(NSArray*)attatchments
     {
         return [self urlForAsset:path];
     }
+    else if ([path hasPrefix:@"app://"])
+    {
+        return [self urlForAppInternalPath:path];
+    }
     else if ([path hasPrefix:@"base64:"])
     {
         return [self urlFromBase64:path];
@@ -316,6 +320,27 @@ - (NSArray*) getAttachments:(NSArray*)attatchments
     return [NSURL fileURLWithPath:absPath];
 }
 
+/**
+ * Retrieves the file URL for an internal app path.
+ *
+ * @param path A relative file path from main bundle dir.
+ *
+ * @return The URL for the internal path.
+ */
+- (NSURL<NSPasteboardWriting>*) urlForAppInternalPath:(NSString*)path
+{
+    NSFileManager* fm = [NSFileManager defaultManager];
+
+    NSBundle* mainBundle = [NSBundle mainBundle];
+    NSString* absPath    = [mainBundle bundlePath];
+
+    if (![fm fileExistsAtPath:absPath]) {
+        NSLog(@"File not found: %@", absPath);
+    }
+
+    return [NSURL fileURLWithPath:absPath];
+}
+
 /**
  * Retrieves the data for a base64 encoded string.
  *