feat(providers): add SimpleLogin oidc (#10491)

Co-authored-by: Kawahara Shotaro <121674121+k-taro56@users.noreply.github.com>
Co-authored-by: Nico Domino <yo@ndo.dev>

.github/ISSUE_TEMPLATE/2_bug_provider.yml

@@ -73,6 +73,7 @@ body:
         - "Pipedrive"
         - "Reddit"
         - "Salesforce"
+        - "SimpleLogin"
         - "Slack"
         - "Spotify"
         - "Strava"

docs/pages/getting-started/providers/simplelogin.mdx

@@ -0,0 +1,95 @@
+import { Callout } from "nextra/components"
+import { Code } from "@/components/Code"
+
+<img
+  align="right"
+  src="/img/providers/simplelogin.svg"
+  height="64"
+  width="64"
+/>
+
+# SimpleLogin Provider
+
+## Resources
+
+- [Sign in with SimpleLogin](https://simplelogin.io/developer/)
+- [SimpleLogin OAuth documentation](https://simplelogin.io/docs/siwsl/intro/)
+- [SimpleLogin OAuth Configuration](https://app.simplelogin.io/developer)
+
+## Setup
+
+### Callback URL
+
+<Code>
+  <Code.Next>
+
+```bash
+https://example.com/api/auth/callback/simplelogin
+```
+
+  </Code.Next>
+  <Code.Svelte>
+
+```bash
+https://example.com/auth/callback/simplelogin
+```
+
+  </Code.Svelte>
+</Code>
+
+### Environment Variables
+
+```
+AUTH_SIMPLELOGIN_ID
+AUTH_SIMPLELOGIN_SECRET
+```
+
+### Configuration
+
+<Code>
+  <Code.Next>
+
+```ts filename="@/auth.ts"
+import NextAuth from "next-auth"
+import SimpleLogin from "next-auth/providers/simplelogin"
+
+export const { handlers, auth, signIn, signOut } = NextAuth({
+  providers: [SimpleLogin],
+})
+```
+
+  </Code.Next>
+  <Code.Svelte>
+
+```ts filename="/src/auth.ts"
+import { SvelteKitAuth } from "@auth/sveltekit"
+import SimpleLogin from "@auth/sveltekit/providers/simplelogin"
+
+export const { handle, signIn, signOut } = SvelteKitAuth({
+  providers: [SimpleLogin],
+})
+```
+
+  </Code.Svelte>
+  <Code.Express>
+
+```ts filename="/src/app.ts"
+import { ExpressAuth } from "@auth/express"
+import SimpleLogin from "@auth/express/providers/simplelogin"
+
+app.use("/auth/*", ExpressAuth({ providers: [SimpleLogin] }))
+```
+
+  </Code.Express>
+</Code>
+
+## Notes
+
+### Authorized Redirect URIs
+
+The "Authorized redirect URIs" used must include your full domain and end in the callback path. By default, SimpleLogin whitelists all `http[s]://localhost:*` address to facilitate local development. For example;
+
+- For production: `https://{YOUR_DOMAIN}/api/auth/callback/simplelogin`
+- For development: By default **localhost** is whitelisted.
+
+**Authorized Redirect URIs** must be **HTTPS** for security reason (except for `localhost`).

packages/core/src/providers/simplelogin.ts

@@ -0,0 +1,107 @@
+/**
+ * <div style={{backgroundColor: "#000", display: "flex", justifyContent: "space-between", color: "#fff", padding: 16}}>
+ * <span>Built-in <b>SimpleLogin</b> integration.</span>
+ * <a href="https://simplelogin.io">
+ *   <img style={{display: "block"}} src="https://authjs.dev/img/providers/simplelogin.svg" height="48" width="48"/>
+ * </a>
+ * </div>
+ *
+ * @module providers/simplelogin
+ */
+import type { OAuthConfig, OAuthUserConfig } from "./index.js"
+
+export interface SimpleLoginProfile {
+  id: number
+  sub: string
+  email: string
+  email_verified: boolean
+  name: string
+  avatar_url: string | undefined
+  client: string
+}
+
+/**
+ * Add SimpleLogin login to your page.
+ *
+ * ### Setup
+ *
+ * #### Callback URL
+ * ```
+ * https://example.com/api/auth/callback/simplelogin
+ * ```
+ *
+ * #### Configuration
+ *```ts
+ * import Auth from "@auth/core"
+ * import SimpleLogin from "@auth/core/providers/simplelogin"
+ *
+ * const request = new Request(origin)
+ * const response = await Auth(request, {
+ *   providers: [
+ *     SimpleLogin({
+ *       clientId: SIMPLELOGIN_CLIENT_ID,
+ *       clientSecret: SIMPLELOGIN_CLIENT_SECRET,
+ *     }),
+ *   ],
+ * })
+ * ```
+ *
+ * ### Resources
+ *
+ *  - [Sign in with SimpleLogin](https://simplelogin.io/developer/)
+ *  - [SimpleLogin OAuth documentation](https://simplelogin.io/docs/siwsl/intro/)
+ *  - [SimpleLogin OAuth Configuration](https://app.simplelogin.io/developer)
+ *
+ * ### Notes
+ *
+ * By default, Auth.js assumes that the SimpleLogin provider is
+ * based on the [Open ID Connect](https://openid.net/specs/openid-connect-core-1_0.html) specification.
+ *
+ * The "Authorized redirect URIs" used must include your full domain and end in the callback path. By default, SimpleLogin whitelists all `http[s]://localhost:*` address to facilitate local development. For example;
+ *
+ * - For production: `https://{YOUR_DOMAIN}/api/auth/callback/simplelogin`
+ * - For development: By default **localhost** is whitelisted.
+ *
+ * :::warning
+ *
+ * **Authorized Redirect URIs** must be **HTTPS** for security reason (except for `localhost`).
+ *
+ * :::
+ *
+ * :::tip
+ *
+ * The SimpleLogin provider comes with a [default configuration](https://github.com/nextauthjs/next-auth/blob/main/packages/core/src/providers/simplelogin.ts).
+ * To override the defaults for your use case, check out [customizing a built-in OAuth provider](https://authjs.dev/guides/configuring-oauth-providers).
+ *
+ * :::
+ *
+ * :::info **Disclaimer**
+ *
+ * If you think you found a bug in the default configuration, you can [open an issue](https://authjs.dev/new/provider-issue).
+ *
+ * Auth.js strictly adheres to the specification and it cannot take responsibility for any deviation from
+ * the spec by the provider. You can open an issue, but if the problem is non-compliance with the spec,
+ * we might not pursue a resolution. You can ask for more help in [Discussions](https://authjs.dev/new/github-discussions).
+ *
+ * :::
+ */
+export default function SimpleLogin<P extends SimpleLoginProfile>(
+  options: OAuthUserConfig<P>
+): OAuthConfig<P> {
+  return {
+    id: "simplelogin",
+    name: "SimpleLogin",
+    type: "oidc",
+    issuer: "https://app.simplelogin.io",
+    profile(profile) {
+      return {
+        id: profile.sub,
+        name: profile.name,
+        email: profile.email,
+        image: profile.avatar_url,
+      }
+    },
+    style: { brandColor: "#e3156a" },
+    options,
+  }
+}