Allow to disable gravatar

Since Gravatar is an external image source and not perfect from a
privacy perspective, forbidding it allows to improve privacy.

This commit also simplifies and optimizes the avatar code.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/lib/letter-avatars.js b/lib/letter-avatars.js
index b5b1d9e7..53fa011a 100644
--- a/lib/letter-avatars.js
+++ b/lib/letter-avatars.js
@@ -1,5 +1,6 @@
 'use strict'
 // external modules
+const md5 = require('blueimp-md5')
 const randomcolor = require('randomcolor')
 const config = require('./config')
 
@@ -24,6 +25,17 @@ exports.generateAvatar = function (name) {
   return svg
 }
 
-exports.generateAvatarURL = function (name) {
-  return config.serverURL + '/user/' + name + '/avatar.svg'
+exports.generateAvatarURL = function (name, email = '', big = true) {
+  let photo
+  if (email !== '' && config.allowGravatar) {
+    photo = 'https://www.gravatar.com/avatar/' + md5(email.toLowerCase())
+    if (big) {
+      photo += '?s=400'
+    } else {
+      photo += '?s=96'
+    }
+  } else {
+    photo = config.serverURL + '/user/' + (name || email.substring(0, email.lastIndexOf('@')) || md5(email.toLowerCase())) + '/avatar.svg'
+  }
+  return photo
 }