From 1f0ecd696dac812d692d2f9afe157403dd29fdc5 Mon Sep 17 00:00:00 2001
From: Sanidhya Kumar Verma <sanidhya.verma12345@gmail.com>
Date: Wed, 4 Sep 2024 11:38:47 +0000
Subject: [PATCH] OAuth implemented

---
 components/oauth.tsx | 27 ++++++++++++++++---
 lib/auth.ts          | 64 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 3 deletions(-)

diff --git a/components/oauth.tsx b/components/oauth.tsx
index c07b184..a6bc887 100644
--- a/components/oauth.tsx
+++ b/components/oauth.tsx
@@ -1,15 +1,36 @@
-import { Image, Text, View } from "react-native";
+import { useOAuth } from "@clerk/clerk-expo";
+import { useCallback } from "react";
+import { Alert, Image, Text, View } from "react-native";
 
 import { icons } from "@/constants";
 
 import { CustomButton } from "./custom-button";
+import { googleOAuth } from "@/lib/auth";
+import { router } from "expo-router";
 
 type OAuthProps = {
   title: string;
 };
 
 export const OAuth = ({ title }: OAuthProps) => {
-  const handleGoogleSignIn = () => {};
+  const { startOAuthFlow } = useOAuth({ strategy: "oauth_google" });
+
+  const handleGoogleOAuth = useCallback(async () => {
+    try {
+      const result = await googleOAuth(startOAuthFlow);
+
+      if (result?.code === "session_exists") {
+        router.replace("/(root)/(tabs)/home");
+      }
+
+      Alert.alert(
+        result?.success ? "Success" : "Error",
+        result?.message || "You are Logged In!",
+      );
+    } catch (err) {
+      console.error("OAuth error", err);
+    }
+  }, [startOAuthFlow]);
 
   return (
     <View>
@@ -34,7 +55,7 @@ export const OAuth = ({ title }: OAuthProps) => {
         )}
         bgVariant="outline"
         textVariant="primary"
-        onPress={handleGoogleSignIn}
+        onPress={handleGoogleOAuth}
       />
     </View>
   );
diff --git a/lib/auth.ts b/lib/auth.ts
index cb1ba6b..8f45769 100644
--- a/lib/auth.ts
+++ b/lib/auth.ts
@@ -1,5 +1,12 @@
+import type {
+  StartOAuthFlowParams,
+  StartOAuthFlowReturnType,
+} from "@clerk/clerk-expo";
+import * as Linking from "expo-linking";
 import * as SecureStore from "expo-secure-store";
 
+import { fetchAPI } from "./fetch";
+
 export interface TokenCache {
   getToken: (key: string) => Promise<string | undefined | null>;
   saveToken: (key: string, token: string) => Promise<void>;
@@ -32,3 +39,60 @@ export const tokenCache = {
     }
   },
 };
+
+type StartOAuthFlowType = (
+  startOAuthFlowParams?: StartOAuthFlowParams,
+) => Promise<StartOAuthFlowReturnType>;
+
+export const googleOAuth = async (startOAuthFlow: StartOAuthFlowType) => {
+  try {
+    const { createdSessionId, signUp, setActive } = await startOAuthFlow({
+      redirectUrl: Linking.createURL("/(root)/(tabs)/home", {
+        scheme: "ryde", // match with scheme in app.json
+      }),
+    });
+
+    if (createdSessionId) {
+      if (setActive) {
+        await setActive!({ session: createdSessionId });
+
+        if (signUp && signUp.createdUserId) {
+          await fetchAPI("/(api)/user", {
+            method: "POST",
+            body: JSON.stringify({
+              name: `${signUp.firstName} ${signUp.lastName}`,
+              email: signUp.emailAddress,
+              clerkId: signUp.createdUserId,
+            }),
+          });
+        }
+
+        return {
+          success: true,
+          code: "success",
+          message: "You are logged in.",
+        };
+      }
+
+      return {
+        success: false,
+        code: "failed",
+        message: "An error occured.",
+      };
+    } else {
+      // Use signIn or signUp for next steps such as MFA
+    }
+  } catch (err) {
+    console.log("[OAUTH]: ", err);
+
+    return {
+      success: false,
+      code: (
+        err as {
+          code?: string;
+        }
+      )?.code,
+      message: "Internal Server Error.",
+    };
+  }
+};