From 73c98bc3afd1a975771c1db1895f313e6e3004b3 Mon Sep 17 00:00:00 2001
From: Hailey <me@haileyok.com>
Date: Fri, 12 Apr 2024 00:35:30 -0700
Subject: [PATCH] native factory impl

---
 .../src/rn-oauth-client-factory.native.ts     | 147 ++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 modules/expo-bluesky-oauth-client/src/rn-oauth-client-factory.native.ts

diff --git a/modules/expo-bluesky-oauth-client/src/rn-oauth-client-factory.native.ts b/modules/expo-bluesky-oauth-client/src/rn-oauth-client-factory.native.ts
new file mode 100644
index 0000000000..79da5cd035
--- /dev/null
+++ b/modules/expo-bluesky-oauth-client/src/rn-oauth-client-factory.native.ts
@@ -0,0 +1,147 @@
+import {Fetch} from '@atproto/fetch'
+import {UniversalIdentityResolver} from '@atproto/identity-resolver'
+import {
+  OAuthAuthorizeOptions,
+  OAuthClientFactory,
+  OAuthResponseMode,
+  OAuthResponseType,
+  Session,
+} from '@atproto/oauth-client'
+import {OAuthClientMetadata} from '@atproto/oauth-client-metadata'
+import IsomorphicOAuthServerMetadataResolver from '@atproto/oauth-server-metadata-resolver'
+
+import {CryptoSubtle} from './crypto-subtle'
+import {DatabaseStore, RNOAuthDatabase} from './rn-oauth-database'
+
+export type BrowserOauthClientFactoryOptions = {
+  responseMode?: OAuthResponseMode
+  responseType?: OAuthResponseType
+  clientMetadata: OAuthClientMetadata
+  fetch?: Fetch
+  crypto?: Crypto
+}
+
+const POPUP_KEY_PREFIX = '@@oauth-popup-callback:'
+
+export class RNOAuthClientFactory extends OAuthClientFactory {
+  readonly sessionStore: DatabaseStore<Session>
+
+  constructor({
+    clientMetadata,
+    // "fragment" is safer as it is not sent to the server
+    responseMode = 'fragment',
+    responseType,
+    crypto = {subtle: CryptoSubtle},
+    fetch = globalThis.fetch,
+  }: BrowserOauthClientFactoryOptions) {
+    const database = new RNOAuthDatabase()
+
+    super({
+      clientMetadata,
+      responseMode,
+      responseType,
+      fetch,
+      cryptoImplementation: new CryptoSubtle(crypto),
+      sessionStore: database.getSessionStore(),
+      stateStore: database.getStateStore(),
+      metadataResolver: new IsomorphicOAuthServerMetadataResolver({
+        fetch,
+        cache: database.getMetadataCache(),
+      }),
+      identityResolver: UniversalIdentityResolver.from({
+        fetch,
+        didCache: database.getDidCache(),
+        handleCache: database.getHandleCache(),
+      }),
+      dpopNonceCache: database.getDpopNonceCache(),
+    })
+
+    this.sessionStore = database.getSessionStore()
+  }
+
+  async restoreAll() {
+    const sessionIds = await this.sessionStore.getKeys()
+    return Object.fromEntries(
+      await Promise.all(
+        sessionIds.map(
+          async sessionId =>
+            [sessionId, await this.restore(sessionId, false)] as const,
+        ),
+      ),
+    )
+  }
+
+  async init(sessionId?: string, forceRefresh = false) {
+    const signInResult = await this.signInCallback()
+    if (signInResult) {
+      return signInResult
+    } else if (sessionId) {
+      const client = await this.restore(sessionId, forceRefresh)
+      return {client}
+    } else {
+      // TODO: we could restore any session from the store ?
+    }
+  }
+
+  async signIn(input: string, options?: OAuthAuthorizeOptions) {
+    return await this.authorize(input, options)
+  }
+
+  async signInCallback() {
+    const redirectUri = new URL(this.clientMetadata.redirect_uris[0])
+    if (location.pathname !== redirectUri.pathname) return null
+
+    const params =
+      this.responseMode === 'query'
+        ? new URLSearchParams(location.search)
+        : new URLSearchParams(location.hash.slice(1))
+
+    // Only if the query string contains oauth callback params
+    if (
+      !params.has('iss') ||
+      !params.has('state') ||
+      !(params.has('code') || params.has('error'))
+    ) {
+      return null
+    }
+
+    // Replace the current history entry without the query string (this will
+    // prevent this 'if' branch to run again if the user refreshes the page)
+    history.replaceState(null, '', location.pathname)
+
+    return this.callback(params)
+      .then(async result => {
+        if (result.state?.startsWith(POPUP_KEY_PREFIX)) {
+          const stateKey = result.state.slice(POPUP_KEY_PREFIX.length)
+
+          await this.popupStore.set(stateKey, {
+            status: 'fulfilled',
+            value: result.client.sessionId,
+          })
+
+          window.close() // continued in signInPopup
+          throw new Error('Login complete, please close the popup window.')
+        }
+
+        return result
+      })
+      .catch(async err => {
+        // TODO: Throw a proper error from parent class to actually detect
+        // oauth authorization errors
+        const state = typeof (err as any)?.state
+        if (typeof state === 'string' && state?.startsWith(POPUP_KEY_PREFIX)) {
+          const stateKey = state.slice(POPUP_KEY_PREFIX.length)
+
+          await this.popupStore.set(stateKey, {
+            status: 'rejected',
+            reason: err,
+          })
+
+          window.close() // continued in signInPopup
+          throw new Error('Login complete, please close the popup window.')
+        }
+
+        throw err
+      })
+  }
+}