Handle sourceMappingURL already prefixed with asset path (#170)

Author: tagCincy

lib/propshaft/compiler/source_mapping_urls.rb

@@ -11,6 +11,8 @@ def compile(logical_path, input)
 
   private
     def asset_path(source_mapping_url, logical_path)
+      source_mapping_url.gsub!(/^(.+\/)?#{url_prefix}\//, "")
+
       if logical_path.dirname.to_s == "."
         source_mapping_url
       else

test/fixtures/assets/mapped/nested/sourceMappingURL-already-prefixed-nested.js

@@ -0,0 +1 @@
+var fun; //# sourceMappingURL=/assets/sourceMappingURL-already-prefixed-nested.js.map

test/fixtures/assets/mapped/nested/sourceMappingURL-already-prefixed-nested.js.map

@@ -0,0 +1 @@
+var fun; //# sourceMappingURL=thisisinvalidassets/sourceMappingURL-already-prefixed-invalid.js.map

test/fixtures/assets/mapped/sourceMappingURL-already-prefixed-invalid.js

@@ -0,0 +1 @@
+var fun; //# sourceMappingURL=/assets/sourceMappingURL-already-prefixed.js.map

test/fixtures/assets/mapped/sourceMappingURL-already-prefixed-invalid.js.map

@@ -53,6 +53,18 @@ class Propshaft::Compiler::SourceMappingUrlsTest < ActiveSupport::TestCase
                  compile_asset(find_asset("sourceMappingURL-outside-comment.css", fixture_path: "mapped"))
   end
 
+  test "sourceMapURL is already prefixed with url_prefix" do
+    assert_match %r{//# sourceMappingURL=/assets/sourceMappingURL-already-prefixed.js-[a-z0-9]{40}\.map},
+                 compile_asset(find_asset("sourceMappingURL-already-prefixed.js", fixture_path: "mapped"))
+    assert_match %r{//# sourceMappingURL=/assets/nested/sourceMappingURL-already-prefixed-nested.js-[a-z0-9]{40}\.map},
+                 compile_asset(find_asset("nested/sourceMappingURL-already-prefixed-nested.js", fixture_path: "mapped"))
+  end
+
+  test "sourceMapURL is already prefixed with an incorrect url_prefix" do
+    refute_match %r{//# sourceMappingURL=thisisinvalidassets/sourceMappingURL-already-prefixed-invalid.js-[a-z0-9]{40}\.map},
+                 compile_asset(find_asset("sourceMappingURL-already-prefixed-invalid.js", fixture_path: "mapped"))
+  end
+
   test "relative url root" do
     @options.relative_url_root = "/url-root"