Added gravatar support in case of no avatar

.env.example

@@ -0,0 +1,19 @@
+# General
+NEXT_PUBLIC_BASE_URL=http://localhost:3000
+
+# Database
+PG_USER=dev
+PG_PASSWORD=dev
+PG_HOST=localhost
+PG_PORT=5433
+PG_DATABASE=dev
+
+# Auth
+BETTER_AUTH_SECRET=
+BETTER_AUTH_URL=http://localhost:3000
+AUTHENTIK_CLIENT_ID=
+AUTHENTIK_CLIENT_SECRET=
+AUTHENTIK_DISCOVERY_URL=
+
+# other
+GRAVATAR_API_KEY=

src/lib/auth/auth.ts

@@ -4,11 +4,30 @@ import { nextCookies } from "better-auth/next-js"
 import { genericOAuth } from "better-auth/plugins"
 import { db } from "../drizzle/db"
 import { env } from "../env/server"
+import { getGravatar } from "../gravatar"
 
 export const auth = betterAuth({
     database: drizzleAdapter(db, {
         provider: "pg"
     }),
+    databaseHooks: {
+        user: {
+            create: {
+                before: async (user) => {
+                    if (user.image) return
+
+                    const newImage = await getGravatar(user.email)
+
+                    return {
+                        data: {
+                            ...user,
+                            image: newImage
+                        }
+                    }
+                }
+            }
+        }
+    },
     plugins: [
         nextCookies(),
         genericOAuth({

src/lib/env/server.ts

@@ -12,7 +12,8 @@ export const env = createEnv({
         BETTER_AUTH_URL: z.string().min(1),
         AUTHENTIK_CLIENT_ID: z.string().min(1),
         AUTHENTIK_CLIENT_SECRET: z.string().min(1),
-        AUTHENTIK_DISCOVERY_URL: z.string().min(1)
+        AUTHENTIK_DISCOVERY_URL: z.string().min(1),
+        GRAVATAR_API_KEY: z.string().min(1)
     },
     createFinalSchema: (schema) => {
         return z.object(schema).transform(s => {

src/lib/gravatar.ts

@@ -0,0 +1,28 @@
+import crypto from "node:crypto"
+import { env } from "./env/server"
+import { z } from "zod"
+
+const gravatarSchema = z.object({
+    avatar_url: z.string().url(),
+})
+
+export async function getGravatar(email: string) {
+    const baseUrl = "https://api.gravatar.com/v3/profiles"
+    const formattedEmail = email.trim().toLowerCase()
+    const hash = crypto.createHash('sha256').update(formattedEmail).digest('hex')
+
+    const res = await fetch(`${baseUrl}/${hash}`, {
+        headers: {
+            Authorization: `Bearer ${env.GRAVATAR_API_KEY}`
+        }
+    })
+
+    if (!res.ok) return null
+
+    const json = await res.json()
+    const { success, data } = gravatarSchema.safeParse(json)
+
+    if (!success) return null
+
+    return data.avatar_url
+}