gravatars in posts

public/templates/topic.tpl

@@ -10,7 +10,7 @@
 <li class="row">
 	<div class="span1 profile-image-block">
 		<!--<i class="icon-spinner icon-spin icon-2x pull-left"></i>-->
-		<img src="https://en.gravatar.com/userimage/18452752/f59e713c717466d2f5ad2a6970769f32.png" align="left" />
+		<img src="{posts.gravatar}" align="left" />
 		<i class="icon-star"></i>2432
 	</div>
 	<div class="span11">

src/posts.js

@@ -43,6 +43,7 @@ var	RDB = require('./redis.js'),
 							timestamp = replies[2];
 
 							user.get_usernames_by_uids(uid, function(userNames) {
+								user.get_gravatars_by_uids(uid, 80, function(gravatars) {
 									var posts = [];
 									for (var i=0, ii=content.length; i<ii; i++) {
 										posts.push({
@@ -50,6 +51,7 @@ var	RDB = require('./redis.js'),
 											'content' : marked(content[i]),
 											'uid' : uid[i],
 											'userName' : userNames[i] || 'anonymous',
+											'gravatar' : gravatars[i],
 											'timestamp' : timestamp[i],
 											'relativeTime': utils.relativeTime(timestamp[i])
 										});
@@ -58,6 +60,7 @@ var	RDB = require('./redis.js'),
 									callback({'topic_name':topic_name, 'topic_id': tid, 'posts': posts});
 								});
 							});
+						});
 				} else {
 					callback({});
 				}

src/user.js

@@ -48,6 +48,33 @@ var	config = require('../config.js'),
 		}
 	}
 
+
+	User.get_gravatars_by_uids = function(uids, size, callback) {
+		var keys = [];
+		for (var i = 0, ii= uids.length; i<ii; i++) {
+			keys.push('uid:' + uids[i] + ':email');
+		}
+
+		var gravatars = [];
+		
+
+		RDB.mget(keys, function(data) {
+			for (var i=0, ii=data.length; i<ii; i++) {
+				if (!data[i]) {
+					gravatars.push("http://www.gravatar.com/avatar/d41d8cd98f00b204e9800998ecf8427e?s=" + size);
+				} else {
+					var	md5sum = crypto.createHash('md5');
+					md5sum.update((data[i]).toLowerCase());
+					gravatars.push('http://www.gravatar.com/avatar/' + md5sum.digest('hex') + '?s=' + size);	
+				}
+				
+			}
+
+			callback(gravatars);
+		});
+		
+	};
+
 	User.login = function(socket, user) {
 		if (user.username == null || user.password == null) {
 			return socket.emit('user.login', {'status': 0, 'message': 'Missing fields'});