Implement catalog conversion natively and add fallback

Libraries/Image/AssetSourceResolver.js

@@ -71,15 +71,6 @@ class AssetSourceResolver {
     return !!(this.jsbundleUrl && this.jsbundleUrl.startsWith('file://'));
   }
 
-  isCatalogAsset(): boolean {
-    return (
-      this.asset.__packager_asset &&
-      (this.asset.type === 'png' ||
-        this.asset.type === 'jpg' ||
-        this.asset.type === 'jpeg')
-    );
-  }
-
   defaultAsset(): ResolvedAssetSource {
     if (this.isLoadedFromServer()) {
       return this.assetServerURL();
@@ -90,9 +81,7 @@ class AssetSourceResolver {
         ? this.drawableFolderInBundle()
         : this.resourceIdentifierWithoutScale();
     } else {
-      return this.isCatalogAsset()
-        ? this.assetFromCatalog()
-        : this.scaledAssetURLNearBundle();
+      return this.scaledAssetURLNearBundle();
     }
   }
 
@@ -134,10 +123,6 @@ class AssetSourceResolver {
     );
   }
 
-  assetFromCatalog(): ResolvedAssetSource {
-    return this.fromSource(getAndroidResourceIdentifier(this.asset));
-  }
-
   /**
    * The default location of assets bundled with the app, located by
    * resource identifier

Libraries/Image/__tests__/resolveAssetSource-test.js

@@ -136,7 +136,7 @@ describe('resolveAssetSource', () => {
           __packager_asset: true,
           width: 100,
           height: 200,
-          uri: 'module_a_logo',
+          uri: 'file:///Path/To/Sample.app/assets/module/a/logo.png',
           scale: 1,
         },
       );
@@ -159,7 +159,7 @@ describe('resolveAssetSource', () => {
           __packager_asset: true,
           width: 100,
           height: 200,
-          uri: '__module_a_logo',
+          uri: 'file:///Path/To/Sample.app/assets/__module/a/logo.png',
           scale: 1,
         },
       );

React/Base/RCTUtils.h

@@ -135,6 +135,9 @@ RCT_EXTERN NSString *__nullable RCTLibraryPath(void);
 // (or nil, if the URL does not specify a path within the Library directory)
 RCT_EXTERN NSString *__nullable RCTLibraryPathForURL(NSURL *__nullable URL);
 
+// Return the name of the asset in the catalog for a packager URL.
+RCT_EXTERN NSString *__nullable RCTAssetCatalogNameForURL(NSURL *__nullable URL);
+
 // Determines if a given image URL refers to a image in bundle
 RCT_EXTERN BOOL RCTIsBundleAssetURL(NSURL *__nullable imageURL);
 

React/Base/RCTUtils.m

@@ -728,13 +728,66 @@ BOOL RCTIsGzippedData(NSData *__nullable data)
   return RCTRelativePathForURL(RCTHomePath(), URL);
 }
 
-static BOOL RCTIsImageAssetsPath(NSString *path)
+static NSRegularExpression *RCTAssetURLScaleRegex()
+{
+  static dispatch_once_t onceToken;
+  static NSRegularExpression *regex;
+  dispatch_once(&onceToken, ^{
+    regex = [NSRegularExpression regularExpressionWithPattern:@"@\\dx$" options:0 error:nil];
+  });
+  return regex;
+}
+
+static NSRegularExpression *RCTAssetURLCharactersRegex()
+{
+  static dispatch_once_t onceToken;
+  static NSRegularExpression *regex;
+  dispatch_once(&onceToken, ^{
+    regex = [NSRegularExpression regularExpressionWithPattern:@"[^a-z0-9_]" options:0 error:nil];
+  });
+  return regex;
+}
+
+NSString *__nullable RCTAssetCatalogNameForURL(NSURL *__nullable URL)
 {
-  if (path == nil) {
-    return NO;
+  NSString *path = RCTBundlePathForURL(URL);
+  // Packager assets always start with assets/
+  if (path == nil || ![path hasPrefix:@"assets/"]) {
+    return nil;
   }
+
+  // Remove extension
+  path = [path stringByDeletingPathExtension];
+
+  // Remove scale suffix
+  path = [RCTAssetURLScaleRegex() stringByReplacingMatchesInString:path
+                                                           options:0
+                                                             range:NSMakeRange(0, [path length])
+                                                      withTemplate:@""];
+
+  path = [path lowercaseString];
+
+  // Encode folder structure in file name
+  path = [path stringByReplacingOccurrencesOfString:@"/" withString:@"_"];
+
+  // Remove illegal chars
+  path = [RCTAssetURLCharactersRegex() stringByReplacingMatchesInString:path
+                                                                options:0
+                                                                  range:NSMakeRange(0, [path length])
+                                                           withTemplate:@""];
+
+  // Remove "assets_" prefix
+  if ([path hasPrefix:@"assets_"]) {
+    path = [path substringFromIndex:@"assets_".length];
+  }
+
+  return path;
+}
+
+static BOOL RCTIsImageAssetsPath(NSString *path)
+{
   NSString *extension = [path pathExtension];
-  return extension.length == 0 || [extension isEqualToString:@"png"] || [extension isEqualToString:@"jpg"];
+  return [extension isEqualToString:@"png"] || [extension isEqualToString:@"jpg"];
 }
 
 BOOL RCTIsBundleAssetURL(NSURL *__nullable imageURL)
@@ -803,6 +856,17 @@ BOOL RCTIsLocalAssetURL(NSURL *__nullable imageURL)
 
 UIImage *__nullable RCTImageFromLocalAssetURL(NSURL *imageURL)
 {
+  NSString *catalogName = RCTAssetCatalogNameForURL(imageURL);
+  if (catalogName) {
+    UIImage *image = [UIImage imageNamed:catalogName];
+    if (image) {
+      return image;
+    } else {
+      RCTLogWarn(
+          @"Image %@ not found in the asset catalog. Make sure your app template is updated correctly.", catalogName);
+    }
+  }
+
   NSString *imageName = RCTBundlePathForURL(imageURL);
 
   NSBundle *bundle = nil;

packages/rn-tester/RNTester/RNAssets.xcassets/Contents.json

@@ -1,6 +1,6 @@
 {
   "info" : {
-    "version" : 1,
-    "author" : "xcode"
+    "author" : "xcode",
+    "version" : 1
   }
 }

packages/rn-tester/RNTesterUnitTests/RCTURLUtilsTests.m

@@ -100,4 +100,25 @@ - (void)testIsLocalAssetsURLParam
   XCTAssertFalse(RCTIsLocalAssetURL(otherAssetsURL));
 }
 
+- (void)testAssetCatalogNameForURL
+{
+  NSString *validAssetPath =
+      [NSString stringWithFormat:@"file://%@/assets/AwesomeModule/icon@2x.png", [[NSBundle mainBundle] resourcePath]];
+  NSString *result = RCTAssetCatalogNameForURL([NSURL URLWithString:validAssetPath]);
+  XCTAssertEqualObjects(result, @"awesomemodule_icon");
+
+  NSString *validAssetNoScalePath =
+      [NSString stringWithFormat:@"file://%@/assets/AwesomeModule/icon.png", [[NSBundle mainBundle] resourcePath]];
+  result = RCTAssetCatalogNameForURL([NSURL URLWithString:validAssetNoScalePath]);
+  XCTAssertEqualObjects(result, @"awesomemodule_icon");
+
+  NSString *notPackagerAssetPath =
+      [NSString stringWithFormat:@"file://%@/icon.png", [[NSBundle mainBundle] resourcePath]];
+  result = RCTAssetCatalogNameForURL([NSURL URLWithString:notPackagerAssetPath]);
+  XCTAssertNil(result);
+
+  result = RCTAssetCatalogNameForURL(nil);
+  XCTAssertNil(result);
+}
+
 @end

template/ios/HelloWorld/RNAssets.xcassets/Contents.json

@@ -1,6 +1,6 @@
 {
   "info" : {
-    "version" : 1,
-    "author" : "xcode"
+    "author" : "xcode",
+    "version" : 1
   }
 }