Treat Accept extensions differently from media type parameters

This parses Accept extensions into a separate object from the other
parameters, which then isn’t used at all for negotiation (since no
extensions have been defined, that I know of) and isn’t returned with
the other parameters when the user asks for detailed media types.

Author: ethanresnick

lib/mediaType.js

@@ -34,32 +34,36 @@ function parseMediaType(s, i) {
       subtype = match[2],
       full = "" + type + "/" + subtype,
       params = {},
-      q = 1;
+      ext = {},
+      q = 1,
+      foundQ = false;
 
   if (match[3]) {
-    params = match[3].split(';').map(function(s) {
-      return s.trim().split('=');
-    }).reduce(function (set, p) {
-      var name = p[0].toLowerCase();
-      var value = p[1];
-
-      set[name] = value && value[0] === '"' && value[value.length - 1] === '"'
-        ? value.substr(1, value.length - 2)
-        : value;
-
-      return set;
-    }, params);
-
-    if (params.q != null) {
-      q = parseFloat(params.q);
-      delete params.q;
-    }
+    match[3].split(';').forEach(function(s) {
+      var nameVal = s.trim().split('=');
+      var name = nameVal[0].toLowerCase();
+      var value = nameVal[1];
+
+      value = value && value[0] === '"' && value[value.length - 1] === '"'
+          ? value.substr(1, value.length - 2)
+          : value;
+
+      if(name === "q") {
+        q = parseFloat(value);
+        foundQ = true;
+      }
+
+      else {
+        (foundQ ? ext : params)[name] = value;
+      }
+    });
   }
 
   return {
     type: type,
     subtype: subtype,
     params: params,
+    ext: ext,
     q: q,
     i: i,
     full: full
@@ -139,7 +143,8 @@ function preferredMediaTypes(accept, provided, options) {
     return {
       type: "" + spec.type + '/' + spec.subtype,
       parameters: spec.params,
-      q: spec.q
+      q: spec.q,
+      extensions: spec.ext
     };
   };
 

test/mediaType.js

@@ -195,13 +195,13 @@ describe('negotiator.mediaTypes()', function () {
 })
 
 describe('negotiator.mediaTypes(_, {detailed: true})', function() {
-  whenAccept('text/html;LEVEL=1, application/json;q=0.5', function () {
+  whenAccept('text/html;LEVEL=1, application/json;q=0.5;fizz=buzz', function () {
     it('should return more-detailed spec objects', function () {
       assert.deepEqual(
         this.negotiator.mediaTypes(undefined, {detailed: true}),
         [
-          {"type": "text/html", "parameters": {"level": "1"}, "q": 1},
-          {"type": "application/json", "parameters": {}, "q": 0.5},
+          {"type": "text/html", "parameters": {"level": "1"}, "q": 1, "extensions": {}},
+          {"type": "application/json", "parameters": {}, "q": 0.5, "extensions": {"fizz": "buzz"}}
         ]
       );
     });
@@ -214,7 +214,7 @@ describe('negotiator.mediaTypes(_, {detailed: true})', function() {
 
       assert.deepEqual(
         this.negotiator.mediaTypes(["text/html; level=1"], {detailed: true}),
-        [{"type": "text/html", "parameters": {"level": "1"}, "q": 1}]
+        [{"type": "text/html", "parameters": {"level": "1"}, "q": 1, "extensions": {}}]
       );
     });
   });