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>

4 files changed, 21 insertions, 27 deletions

diff --git a/lib/config/default.js b/lib/config/default.js
index f88c17b3..ec44ae78 100644
--- a/lib/config/default.js
+++ b/lib/config/default.js
@@ -146,5 +146,6 @@ module.exports = {
   },
   email: true,
   allowEmailRegister: true,
+  allowGravatar: true,
   allowPDFExport: true
 }
diff --git a/lib/config/environment.js b/lib/config/environment.js
index e1c11569..0ca3d920 100644
--- a/lib/config/environment.js
+++ b/lib/config/environment.js
@@ -120,5 +120,6 @@ module.exports = {
   },
   email: toBooleanConfig(process.env.HMD_EMAIL),
   allowEmailRegister: toBooleanConfig(process.env.HMD_ALLOW_EMAIL_REGISTER),
+  allowGravatar: toBooleanConfig(process.env.HMD_ALLOW_GRAVATAR),
   allowPDFExport: toBooleanConfig(process.env.HMD_ALLOW_PDF_EXPORT)
 }
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
 }
diff --git a/lib/models/user.js b/lib/models/user.js
index 5dd13869..1bd8c745 100644
--- a/lib/models/user.js
+++ b/lib/models/user.js
@@ -1,6 +1,5 @@
 'use strict'
 // external modules
-var md5 = require('blueimp-md5')
 var Sequelize = require('sequelize')
 var scrypt = require('scrypt')
 
@@ -128,10 +127,7 @@ module.exports = function (sequelize, DataTypes) {
             }
             break
           case 'dropbox':
-            // no image api provided, use gravatar
-            photo = 'https://www.gravatar.com/avatar/' + md5(profile.emails[0].value)
-            if (bigger) photo += '?s=400'
-            else photo += '?s=96'
+            photo = generateAvatarURL('', profile.emails[0].value, bigger)
             break
           case 'google':
             photo = profile.photos[0].value
@@ -139,35 +135,19 @@ module.exports = function (sequelize, DataTypes) {
             else photo = photo.replace(/(\?sz=)\d*$/i, '$196')
             break
           case 'ldap':
-            // no image api provided,
-            // use gravatar if email exists,
-            // otherwise generate a letter avatar
-            if (profile.emails[0]) {
-              photo = 'https://www.gravatar.com/avatar/' + md5(profile.emails[0])
-              if (bigger) photo += '?s=400'
-              else photo += '?s=96'
-            } else {
-              photo = generateAvatarURL(profile.username)
-            }
+            photo = generateAvatarURL(profile.username, profile.emails[0], bigger)
             break
           case 'saml':
-            if (profile.emails[0]) {
-              photo = 'https://www.gravatar.com/avatar/' + md5(profile.emails[0])
-              if (bigger) photo += '?s=400'
-              else photo += '?s=96'
-            } else {
-              photo = generateAvatarURL(profile.username)
-            }
+            photo = generateAvatarURL(profile.username, profile.emails[0], bigger)
             break
         }
         return photo
       },
       parseProfileByEmail: function (email) {
-        var photoUrl = 'https://www.gravatar.com/avatar/' + md5(email)
         return {
           name: email.substring(0, email.lastIndexOf('@')),
-          photo: photoUrl + '?s=96',
-          biggerphoto: photoUrl + '?s=400'
+          photo: generateAvatarURL('', email, false),
+          biggerphoto: generateAvatarURL('', email, true)
         }
       }
     }