jcsrb · July 13, 2011 23:05 · Jul 13, 2011
diff --git a/gistfile1.js b/gistfile1.js
@@ -0,0 +1,123 @@
+function get_avatar_from_service(service, userid, size) {
+    // this return the url that redirects to the according user image/avatar/profile picture
+    // implemented services: google profiles, facebook, gravatar, twitter, tumblr, default fallback
+    // for google   use get_avatar_from_service('google', profile-name or user-id , size-in-px )
+    // for facebook use get_avatar_from_service('facebook', vanity url or user-id , size-in-px or size-as-word )
+    // for gravatar use get_avatar_from_service('gravatar', md5 hash email@adress, size-in-px )
+    // for twitter  use get_avatar_from_service('twitter', username, size-in-px or size-as-word )
+    // for tumblr   use get_avatar_from_service('tumblr', blog-url, size-in-px )
+    // everything else will go to the fallback
+    // google and gravatar scale the avatar to any site, others will guided to the next best version
+    var url = '';
+
+    switch (service) {
+
+    case "google":
+        // see http://googlesystem.blogspot.com/2011/03/unedited-google-profile-pictures.html (couldn't find a better link)
+        // available sizes: all, google rescales for you
+        url = "http://profiles.google.com/s2/photos/profile/" + userid + "?sz=" + size;
+        break;
+
+    case "facebook":
+        // see https://developers.facebook.com/docs/reference/api/
+        // available sizes: square (50x50), small (50xH) , normal (100xH), large (200xH)
+        var sizeparam = '';
+        if (isNumber(size)) {
+            if (size >= 200) {
+                sizeparam = 'large'
+            };
+            if (size >= 100 && size < 200) {
+                sizeparam = 'normal'
+            };
+            if (size >= 50 && size < 100) {
+                sizeparam = 'small'
+            };
+            if (size < 50) {
+                sizeparam = 'square'
+            };
+        } else {
+            sizeparam = size;
+        }
+        url = "https://graph.facebook.com/" + userid + "/picture?type=" + sizeparam;
+        break;
+
+    case "gravatar":
+        // see http://en.gravatar.com/site/implement/images/
+        // available sizes: all, gravatar rescales for you
+        url = "http://www.gravatar.com/avatar/" + userid + "?s=" + size
+        break;
+
+    case "twitter":
+        // see https://dev.twitter.com/docs/api/1/get/users/profile_image/%3Ascreen_name
+        // available sizes: bigger (73x73), normal (48x48), mini (24x24), no param will give you full size
+        var sizeparam = '';
+        if (isNumber(size)) {
+            if (size >= 73) {
+                sizeparam = 'bigger'
+            };
+            if (size >= 48 && size < 73) {
+                sizeparam = 'normal'
+            };
+            if (size < 48) {
+                sizeparam = 'mini'
+            };
+        } else {
+            sizeparam = size;
+        }
+
+        url = "http://api.twitter.com/1/users/profile_image?screen_name=" + userid + "&size=" + sizeparam;
+        break;
+
+    case "tumblr":
+        // see http://www.tumblr.com/docs/en/api/v2#blog-avatar
+        //TODO do something smarter with the ranges
+        // available sizes: 16, 24, 30, 40, 48, 64, 96, 128, 512
+        var sizeparam = '';
+        if (size >= 512) {
+            sizeparam = 512
+        };
+        if (size >= 128 && size < 512) {
+            sizeparam = 128
+        };
+        if (size >= 96 && size < 128) {
+            sizeparam = 96
+        };
+        if (size >= 64 && size < 96) {
+            sizeparam = 64
+        };
+        if (size >= 48 && size < 64) {
+            sizeparam = 48
+        };
+        if (size >= 40 && size < 48) {
+            sizeparam = 40
+        };
+        if (size >= 30 && size < 40) {
+            sizeparam = 30
+        };
+        if (size >= 24 && size < 30) {
+            sizeparam = 24
+        };
+        if (size < 24) {
+            sizeparam = 16
+        };
+
+        url = "http://api.tumblr.com/v2/blog/" + userid + "/avatar/" + sizeparam;
+        break;
+
+    default:
+        // http://www.iconfinder.com/icondetails/23741/128/avatar_devil_evil_green_monster_vampire_icon
+        // find your own
+        url = "http://i.imgur.com/RLiDK.png"; // 48x48
+    }
+
+
+    return url;
+}
+
+
+// helper methods
+
+function isNumber(n) {
+    // see http://stackoverflow.com/questions/18082/validate-numbers-in-javascript-isnumeric
+    return !isNaN(parseFloat(n)) && isFinite(n);
+}