🚩 add provision flow in oauth

Create a flow where if the user logs in with a registered Google account, they are immediately authenticated, but if no
account is found, create a new one.

src/modules/auth/auth.types.ts

@@ -1,6 +1,9 @@
-export interface LoginIfExistAndCreateIfNot {
-  email: string;
-  username?: string;
+export interface GoogleCallbackUserData {
+  sub: string;
   name: string;
-  provider: "Google" | "GitHub";
+  given_name: string;
+  family_name: string;
+  picture: string;
+  email: string;
+  email_verified: boolean;
 }

src/modules/auth/controllers/googleCallback.controller.ts

@@ -2,12 +2,15 @@ import { Context } from "elysia";
 import { returnWriteResponse } from "../../../helpers/callback/httpResponse";
 import { mainErrorHandler } from "../../../helpers/error/handler";
 import { googleCallbackService } from "../services/http/googleCallback.service";
+import { getUserHeaderInformation } from "../../../helpers/http/userHeader/getUserHeaderInformation";
 
 export const googleCallbackController = async (
   ctx: Context & { query: { code: string; state: string } }
 ) => {
   try {
-    const userData = await googleCallbackService(ctx.query);
+    const userHeaderInfo = getUserHeaderInformation(ctx);
+
+    const userData = await googleCallbackService(ctx.query, userHeaderInfo);
     return returnWriteResponse(
       ctx.set,
       200,

src/modules/auth/services/http/googleCallback.service.ts

@@ -2,11 +2,17 @@ import { AppError } from "../../../../helpers/error/instances/app";
 import { googleProvider } from "../../providers/google.provider";
 import { redis } from "../../../../utils/databases/redis/connection";
 import { ErrorForwarder } from "../../../../helpers/error/instances/forwarder";
+import { UserHeaderInformation } from "../../../../helpers/http/userHeader/getUserHeaderInformation/types";
+import { OAuthUserProvisionService } from "../internal/OAuthUserProvision.service";
+import { GoogleCallbackUserData } from "../../auth.types";
 
-export const googleCallbackService = async (query: {
-  state: string;
-  code: string;
-}) => {
+export const googleCallbackService = async (
+  query: {
+    state: string;
+    code: string;
+  },
+  userHeaderInfo: UserHeaderInformation
+) => {
   try {
     // get code and state for validation from params and search for state in redis cache
     const state = query.state;
@@ -36,7 +42,19 @@ export const googleCallbackService = async (query: {
       }
     );
 
-    return await response.json();
+    const userData = (await response.json()) as GoogleCallbackUserData;
+
+    return await OAuthUserProvisionService(
+      {
+        providerName: "google",
+        openId: userData.sub,
+        email: userData.email,
+        name: userData.name,
+        avatar: userData.picture,
+      },
+      userData,
+      userHeaderInfo
+    );
   } catch (error) {
     ErrorForwarder(error, 500, "Authentication service error");
   }

src/modules/auth/services/internal/OAuthUserProvision.service.ts

@@ -0,0 +1,35 @@
+import { UserHeaderInformation } from "../../../../helpers/http/userHeader/getUserHeaderInformation/types";
+import { findUserService } from "../../../user/services/internal/findUser.service";
+
+export const OAuthUserProvisionService = async (
+  payload: {
+    providerName: string;
+    openId: string;
+    email: string;
+    username?: string;
+    name: string;
+    avatar?: string;
+    bio?: string;
+  },
+  providerRawCallback: unknown,
+  userHeaderInfo: UserHeaderInformation
+) => {
+  /**
+   * Create auth session if user already exist,
+   * create user account and give them auth session if not
+   *
+   * This is just example!!
+   */
+  const providerId = `${payload.providerName}_${payload.openId}`;
+  const findUserResult = await findUserService({
+    identifier: providerId,
+    queryTarget: "providerId",
+    options: { verbosity: "exists" },
+  });
+
+  if (findUserResult) {
+    return "Already Created";
+  } else {
+    return "Not Found";
+  }
+};

src/modules/auth/services/internal/loginIfExistAndCreateIfNot.service.ts

@@ -1,6 +0,0 @@
-export const loginIfExistAndCreateIfNotService = () => {
-  /**
-   * Create auth session if user already exist,
-   * create user account and give them auth session if not
-   */
-};