feat(providers): add Trakt provider (#3771)

* added trakt provider

* fixed incorrect auth url

* Update src/providers/trakt.ts

Co-authored-by: Balázs Orbán <info@balazsorban.com>

* Update src/providers/trakt.ts

Co-authored-by: Balázs Orbán <info@balazsorban.com>

* Update trakt.ts

Co-authored-by: caidenwilson <caidenwilson@protonmail.com>
Co-authored-by: Balázs Orbán <info@balazsorban.com>

app/.env.local.example

@@ -33,6 +33,9 @@ TWITTER_SECRET=
 LINE_ID=
 LINE_SECRET=
 
+TRAKT_ID=
+TRAKT_SECRET=
+
 # Example configuration for a Gmail account (will need SMTP enabled)
 EMAIL_SERVER=smtps://user@gmail.com:password@smtp.gmail.com:465
 EMAIL_FROM=user@gmail.com

app/pages/api/auth/[...nextauth].ts

@@ -28,6 +28,7 @@ import AzureB2C from "next-auth/providers/azure-ad-b2c"
 import OsuProvider from "next-auth/providers/osu"
 import AppleProvider from "next-auth/providers/apple"
 import PatreonProvider from "next-auth/providers/patreon"
+import TraktProvider from "next-auth/providers/trakt"
 
 // import { PrismaAdapter } from "@next-auth/prisma-adapter"
 // import { PrismaClient } from "@prisma/client"
@@ -190,6 +191,10 @@ export const authOptions: NextAuthOptions = {
       clientId: process.env.PATREON_ID,
       clientSecret: process.env.PATREON_SECRET,
     }),
+    TraktProvider({
+      clientId: process.env.TRAKT_ID,
+      clientSecret: process.env.TRAKT_SECRET,
+    }),
   ],
   debug: true,
   theme: {

src/providers/trakt.ts

@@ -0,0 +1,56 @@
+import type { OAuthConfig, OAuthUserConfig } from "."
+
+export interface TraktUser {
+  username: string
+  private: boolean
+  name: string
+  vip: boolean
+  vip_ep: boolean
+  ids: { slug: string }
+  joined_at: string
+  location: string | null
+  about: string | null
+  gender: string | null
+  age: number | null
+  images: { avatar: { full: string } }
+}
+
+export default function Trakt<
+  P extends Record<string, any> = TraktUser
+>(options: OAuthUserConfig<P>): OAuthConfig<P> {
+  return {
+    id: "trakt",
+    name: "Trakt",
+    type: "oauth",
+    authorization: {
+      url: "https://trakt.tv/oauth/authorize",
+      params: { scope: "" }, // when default, trakt returns auth error
+    },
+    token: "https://api.trakt.tv/oauth/token",
+
+    userinfo: {
+      async request(context) {
+        const res = await fetch("https://api.trakt.tv/users/me?extended=full", {
+          headers: {
+            Authorization: `Bearer ${context.tokens.access_token}`,
+            "trakt-api-version": "2",
+            "trakt-api-key": context.provider.clientId as string,
+          },
+        })
+
+        if (res.ok) return await res.json()
+
+        throw new Error("Expected 200 OK from the userinfo endpoint")
+      },
+    },
+    profile(profile) {
+      return {
+        id: profile.ids.slug,
+        name: profile.name,
+        email: null, // trakt does not provide user emails
+        image: profile.images.avatar.full, // trakt does not allow hotlinking
+      }
+    },
+    options,
+  }
+}