fix: ensure Images are produced for discord (#734)

Author: daggy1234

src/providers/discord.js

@@ -7,14 +7,20 @@ export default (options) => {
     scope: 'identify email',
     params: { grant_type: 'authorization_code' },
     accessTokenUrl: 'https://discord.com/api/oauth2/token',
-    authorizationUrl:
-      'https://discord.com/api/oauth2/authorize?response_type=code&prompt=none',
+    authorizationUrl: 'https://discord.com/api/oauth2/authorize?response_type=code&prompt=none',
     profileUrl: 'https://discord.com/api/users/@me',
     profile: (profile) => {
+      if (profile.avatar === null) {
+        const defaultAvatarNumber = parseInt(profile.discriminator) % 5
+        profile.image_url = `https://cdn.discordapp.com/embed/avatars/${defaultAvatarNumber}.png`
+      } else {
+        const format = profile.premium_type === 1 || profile.premium_type === 2 ? 'gif' : 'png'
+        profile.image_url = `https://cdn.discordapp.com/avatars/${profile.id}/${profile.avatar}.${format}`
+      }
       return {
         id: profile.id,
         name: profile.username,
-        image: `https://cdn.discordapp.com/avatars/${profile.id}/${profile.avatar}.png`,
+        image: profile.image_url,
         email: profile.email
       }
     },