Inserting Users into Supabase when they sign up

In our example app a user can sign up via Social Login based authentication. We will need to override this API such that when a user signs up, their email mapped to their userId is stored in Supabase.

Step 2: Overriding the Social Provider login function:#

// config/backendConfig.ts
import ThirdParty from "supertokens-node/recipe/thirdparty";import SessionNode from "supertokens-node/recipe/session";import { TypeInput, AppInfo } from "supertokens-node/types";
let appInfo: AppInfo = {    appName: "TODO: add your app name",    apiDomain: "TODO: add your website domain",    websiteDomain: "TODO: add your website domain"}
// take a look at the Creating Supabase Client section to see how to define getSupabaselet getSupabase: any;
let backendConfig = (): TypeInput => {    return {        framework: "express",        supertokens: {            connectionURI: "https://try.supertokens.com",        },        appInfo,        recipeList: [            ThirdParty.init({                signInAndUpFeature:{                    providers: [/*...*/]                },                override: {                    apis: (originalImplementation) => {                        return {                            ...originalImplementation,
                            // the signInUpPOST function handles sign up/in via Social login                            signInUpPOST: async function (input) {                                if (originalImplementation.signInUpPOST === undefined) {                                    throw Error("Should never come here");                                }
                                // call the sign up/in api for social login                                let response = await originalImplementation.signInUpPOST(input);
                                // check that there is no issue with sign up and that a new user is created                                if (response.status === "OK" && response.createdNewUser) {
                                    // retrieve the accessTokenPayload from the user's session                                    const accessTokenPayload = response.session.getAccessTokenPayload();
                                    // create a supabase client with the supabase_token from the accessTokenPayload                                    const supabase = getSupabase(accessTokenPayload.supabase_token);
                                    // store the user's email mapped to their userId in Supabase                                    const { error } = await supabase                                        .from("users")                                        .insert({ email: response.user.email, user_id: response.user.id });
                                    if (error !== null) {
                                        throw error;                                    }                                }
                                return response;                            }                        };                    },                },            }),            SessionNode.init({/*...*/}),        ],        isInServerlessEnv: true,    };};

We will be changing the Social Login flow by overriding the signInUpPOST api. We will first check that the user logging in is a new user. If they are a new user we will retrieve the supabase_token from their accessTokenPayload and use it to map their email to userId in Supabase.