Fabric: Fixed image URLs parsing

Summary:
@public
It's a basically reimplementation of `+[RCTConvert NSURL:]`.

Reviewed By: mdvacca

Differential Revision: D9146850

fbshipit-source-id: 57ecac1eb35b57b0d417b599371bd0c4a3988116

ReactCommon/fabric/imagemanager/platform/ios/RCTImagePrimitivesConversions.h

@@ -32,8 +32,9 @@ inline std::string toString(const ImageResizeMode &value) {
   }
 }
 
-inline static NSURLRequest *NSURLRequestFromImageSource(const ImageSource &imageSource) {
-
+inline static NSURL *NSURLFromImageSource(const ImageSource &imageSource) {
+  // `NSURL` has a history of crashing with bad input, so let's be safe.
+  @try {
     NSString *urlString = [NSString stringWithCString:imageSource.uri.c_str()
                                              encoding:NSASCIIStringEncoding];
 
@@ -45,6 +46,48 @@ inline static NSURLRequest *NSURLRequestFromImageSource(const ImageSource &image
 
     NSURL *url = [[NSURL alloc] initWithString:urlString];
 
+    if (url.scheme) {
+      // Well-formed absolute URL.
+      return url;
+    }
+
+    if ([urlString rangeOfString:@":"].location != NSNotFound) {
+      // The URL has a scheme.
+      urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+      url = [NSURL URLWithString:urlString];
+      return url;
+    }
+
+    // Assume that it's a local path.
+    urlString = [urlString stringByRemovingPercentEncoding];
+
+    if ([urlString hasPrefix:@"~"]) {
+      // Path is inside user directory.
+      urlString = [urlString stringByExpandingTildeInPath];
+    } else {
+      if (![urlString isAbsolutePath]) {
+        // Assume it's a resource path.
+        urlString = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:urlString];
+      }
+    }
+
+    url = [NSURL fileURLWithPath:urlString];
+
+    return url;
+  }
+  @catch (__unused NSException *exception) {
+    return nil;
+  }
+}
+
+inline static NSURLRequest *NSURLRequestFromImageSource(const ImageSource &imageSource) {
+  NSURL *url = NSURLFromImageSource(imageSource);
+
+  if (!url) {
+    RCTLogError(@"URI parsing error.");
+    return nil;
+  }
+
   NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
 
   /*