feat: add polar provider

* feat: add polar provider

* up

---------

Co-authored-by: Sébastien Chopin <[email protected]>

README.md

@@ -218,6 +218,7 @@ It can also be set using environment variables:
 - LinkedIn
 - Microsoft
 - PayPal
+- Polar
 - Spotify
 - Steam
 - TikTok

playground/.env.example

@@ -71,3 +71,6 @@ NUXT_OAUTH_TIKTOK_CLIENT_SECRET=
 # Dropbox
 NUXT_OAUTH_DROPBOX_CLIENT_ID=
 NUXT_OAUTH_DROPBOX_CLIENT_SECRET=
+# Polar
+NUXT_OAUTH_POLAR_CLIENT_ID=
+NUXT_OAUTH_POLAR_CLIENT_SECRET=

playground/app.vue

@@ -135,6 +135,12 @@ const providers = computed(() =>
       disabled: Boolean(user.value?.dropbox),
       icon: 'i-simple-icons-dropbox',
     },
+    {
+      label: user.value?.polar || 'Polar',
+      to: '/auth/polar',
+      disabled: Boolean(user.value?.polar),
+      icon: 'i-iconoir-polar-sh',
+    },
   ].map(p => ({
     ...p,
     prefetch: false,

playground/auth.d.ts

@@ -25,6 +25,7 @@ declare module '#auth-utils' {
     yandex?: string
     tiktok?: string
     dropbox?: string
+    polar?: string
   }
 
   interface UserSession {

playground/package.json

@@ -8,12 +8,13 @@
     "generate": "nuxi generate"
   },
   "dependencies": {
+    "@iconify-json/gravity-ui": "^1.2.1",
+    "@iconify-json/iconoir": "^1.2.1",
     "nuxt": "^3.13.2",
     "nuxt-auth-utils": "latest",
     "zod": "^3.23.8"
   },
   "devDependencies": {
-    "@iconify-json/gravity-ui": "^1.2.1",
     "better-sqlite3": "^11.2.1"
   }
 }

playground/server/routes/auth/polar.get.ts

@@ -0,0 +1,15 @@
+export default defineOAuthPolarEventHandler({
+  config: {
+    emailRequired: true,
+  },
+  async onSuccess(event, { user }) {
+    await setUserSession(event, {
+      user: {
+        polar: user.email,
+      },
+      loggedInAt: Date.now(),
+    })
+
+    return sendRedirect(event, '/')
+  },
+})

src/module.ts

@@ -288,5 +288,11 @@ export default defineNuxtModule<ModuleOptions>({
       clientSecret: '',
       redirectURL: '',
     })
+    // Polar OAuth
+    runtimeConfig.oauth.polar = defu(runtimeConfig.oauth.polar, {
+      clientId: '',
+      clientSecret: '',
+      redirectURL: '',
+    })
   },
 })

src/runtime/server/lib/oauth/polar.ts

@@ -0,0 +1,136 @@
+import type { H3Event } from 'h3'
+import { eventHandler, getQuery, sendRedirect } from 'h3'
+import { withQuery } from 'ufo'
+import { defu } from 'defu'
+import { handleAccessTokenErrorResponse, handleMissingConfiguration, getOAuthRedirectURL, requestAccessToken } from '../utils'
+import { useRuntimeConfig, createError } from '#imports'
+import type { OAuthConfig } from '#auth-utils'
+
+export interface OAuthPolarConfig {
+  /**
+   * Polar Client ID
+   * @default process.env.NUXT_OAUTH_POLAR_CLIENT_ID
+   */
+  clientId?: string
+
+  /**
+   * Polar OAuth Client Secret
+   * @default process.env.NUXT_OAUTH_POLAR_CLIENT_SECRET
+   */
+  clientSecret?: string
+
+  /**
+   * Polar OAuth Scope
+   * @default []
+   * @see https://api.polar.sh/.well-known/openid-configuration
+   * @example ['openid']
+   */
+  scope?: string[]
+
+  /**
+   * Require email from user, adds the ['email'] scope if not present
+   * @default false
+   */
+  emailRequired?: boolean
+
+  /**
+   * Polar OAuth Authorization URL
+   * @see https://docs.polar.sh/api/authentication#start-the-authorization-flow
+   * @default 'https://polar.sh/oauth2/authorize'
+   */
+  authorizationURL?: string
+
+  /**
+   * Polar OAuth Token URL
+   * @see https://docs.polar.sh/api/authentication#exchange-the-authorization-code
+   * @default 'https://api.polar.sh/v1/oauth2/token'
+   */
+  tokenURL?: string
+
+  /**
+   * Extra authorization parameters to provide to the authorization URL
+   * @see https://docs.polar.sh/api/authentication#user-vs-organization-access-tokens
+   * @example { sub_type: 'organization' }
+   */
+  authorizationParams?: Record<string, string>
+
+  /**
+   * Redirect URL to to allow overriding for situations like prod failing to determine public hostname
+   * @default process.env.NUXT_OAUTH_POLAR_REDIRECT_URL or current URL
+   */
+  redirectURL?: string
+}
+
+export function defineOAuthPolarEventHandler({ config, onSuccess, onError }: OAuthConfig<OAuthPolarConfig>) {
+  return eventHandler(async (event: H3Event) => {
+    config = defu(config, useRuntimeConfig(event).oauth?.polar, {
+      authorizationURL: 'https://polar.sh/oauth2/authorize',
+      tokenURL: 'https://api.polar.sh/v1/oauth2/token',
+    }) as OAuthPolarConfig
+    const query = getQuery<{ code?: string }>(event)
+    if (!config.clientId || !config.clientSecret) {
+      return handleMissingConfiguration(event, 'polar', ['clientId', 'clientSecret'], onError)
+    }
+
+    const redirectURL = config.redirectURL || getOAuthRedirectURL(event)
+
+    if (!query.code) {
+      config.scope = config.scope || []
+      if (!config.scope.includes('openid'))
+        config.scope.push('openid')
+      if (config.emailRequired && !config.scope.includes('email'))
+        config.scope.push('email')
+
+      // Redirect to Polar Oauth page
+      return sendRedirect(
+        event,
+        withQuery(config.authorizationURL as string, {
+          response_type: 'code',
+          client_id: config.clientId,
+          redirect_uri: redirectURL,
+          scope: config.scope.join(' '),
+          ...config.authorizationParams,
+        }),
+      )
+    }
+
+    const tokens = await requestAccessToken(config.tokenURL as string, {
+      body: {
+        grant_type: 'authorization_code',
+        redirect_uri: redirectURL,
+        client_id: config.clientId,
+        client_secret: config.clientSecret,
+        code: query.code,
+      },
+    })
+
+    if (tokens.error) {
+      return handleAccessTokenErrorResponse(event, 'polar', tokens, onError)
+    }
+    const accessToken = tokens.access_token
+
+    // TODO: improve typing
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const user: any = await $fetch('https://api.polar.sh/v1/oauth2/userinfo', {
+      headers: {
+        Authorization: `Bearer ${accessToken}`,
+        Accept: 'application/json',
+      },
+    })
+
+    if (!user) {
+      const error = createError({
+        statusCode: 500,
+        message: 'Could not get Polar user',
+        data: tokens,
+      })
+      if (!onError) throw error
+      return onError(event, error)
+    }
+
+    return onSuccess(event, {
+      tokens,
+      user,
+    })
+  })
+}

src/runtime/types/oauth-config.ts

@@ -1,6 +1,6 @@
 import type { H3Event, H3Error } from 'h3'
 
-export type OAuthProvider = 'auth0' | 'battledotnet' | 'cognito' | 'discord' | 'dropbox' | 'facebook' | 'github' | 'gitlab' | 'google' | 'instagram' | 'keycloak' | 'linkedin' | 'microsoft' | 'paypal' | 'spotify' | 'steam' | 'tiktok' | 'twitch' | 'vk' | 'x' | 'xsuaa' | 'yandex' | (string & {})
+export type OAuthProvider = 'auth0' | 'battledotnet' | 'cognito' | 'discord' | 'dropbox' | 'facebook' | 'github' | 'gitlab' | 'google' | 'instagram' | 'keycloak' | 'linkedin' | 'microsoft' | 'paypal' | 'polar' | 'spotify' | 'steam' | 'tiktok' | 'twitch' | 'vk' | 'x' | 'xsuaa' | 'yandex' | (string & {})
 
 export type OnError = (event: H3Event, error: H3Error) => Promise<void> | void