Basic support for URL prefixes in google.protobuf.Any types.

Not all languages accept just the fully qualified name as type_url. In
the official C++/C# protobuf library the type_url must at least start
with a '/', otherwise the name is not resolved.

Additionally we should be able to unpack types even if they have an
URL prefix like type.googleapis.com/full.type.name. This commit just
removes the URL prefix (similar as in other implementations I saw,
e.g. python).

src/wrappers.js

@@ -48,8 +48,9 @@ wrappers[".google.protobuf.Any"] = {
                 // type_url does not accept leading "."
                 var type_url = object["@type"].charAt(0) === "." ?
                     object["@type"].substr(1) : object["@type"];
+                // type_url prefix is optional, but path seperator is required
                 return this.create({
-                    type_url: type_url,
+                    type_url: "/" + type_url,
                     value: type.encode(type.fromObject(object)).finish()
                 });
             }
@@ -62,7 +63,9 @@ wrappers[".google.protobuf.Any"] = {
 
         // decode value if requested and unmapped
         if (options && options.json && message.type_url && message.value) {
-            var type = this.lookup(message.type_url);
+            // Only use fully qualified type name after the last '/'
+            var name = message.type_url.substring(message.type_url.lastIndexOf("/") + 1);
+            var type = this.lookup(name);
             /* istanbul ignore else */
             if (type)
                 message = type.decode(message.value);

tests/comp_google_protobuf_any.js

@@ -51,7 +51,16 @@ tape.test("google.protobuf.Any", function(test) {
         }
     });
     test.ok(foo.foo instanceof Any.ctor, "should convert to Any in fromObject");
-    test.same(foo.foo, { type_url: "Bar", value: protobuf.util.newBuffer([10, 1, 97]) }, "should have correct Any object when converted with fromObject");
+    test.same(foo.foo, { type_url: "/Bar", value: protobuf.util.newBuffer([10, 1, 97]) }, "should have correct Any object when converted with fromObject");
+
+    var baz = Foo.fromObject({
+        foo: {
+            type_url: "type.someurl.com/Bar",
+            value: [1 << 3 | 2, 1, 97] // value = "a"
+        }
+    });
+    obj = Foo.toObject(baz, { json: true });
+    test.same(obj.foo, { "@type": ".Bar", bar: "a" }, "should not care about prefix in type url");
 
     test.end();
 });