Support show last change user with profile and support YAML config inside the note with robots, lang, dir, breaks options

lib/user.js

@@ -1,6 +1,7 @@
 //user
 //external modules
 var mongoose = require('mongoose');
+var md5 = require("blueimp-md5").md5;
 
 //core
 var config = require("../config.js");
@@ -20,9 +21,30 @@ var user = {
     findUser: findUser,
     newUser: newUser,
     findOrNewUser: findOrNewUser,
-    getUserCount: getUserCount
+    getUserCount: getUserCount,
+    parsePhotoByProfile: parsePhotoByProfile
 };
 
+function parsePhotoByProfile(profile) {
+    var photo = null;
+    switch (profile.provider) {
+        case "facebook":
+            photo = 'https://graph.facebook.com/' + profile.id + '/picture';
+            break;
+        case "twitter":
+            photo = profile.photos[0].value;
+            break;
+        case "github":
+            photo = 'https://avatars.githubusercontent.com/u/' + profile.id + '?s=48';
+            break;
+        case "dropbox":
+            //no image api provided, use gravatar
+            photo = 'https://www.gravatar.com/avatar/' + md5(profile.emails[0].value);
+            break;
+    }
+    return photo;
+}
+
 function getUserCount(callback) {
     model.count(function(err, count){
         if(err) callback(err, null);
@@ -31,9 +53,13 @@ function getUserCount(callback) {
 }
 
 function findUser(id, callback) {
-    model.findOne({
-        id: id
-    }, function (err, user) {
+    var rule = {};
+    var checkForHexRegExp = new RegExp("^[0-9a-fA-F]{24}$");
+    if (checkForHexRegExp.test(id))
+        rule._id = id;
+    else
+        rule.id = id;
+    model.findOne(rule, function (err, user) {
         if (err) {
             logger.error('find user failed: ' + err);
             callback(err, null);