Authentication
Google
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Configuration

In order to be able to use the google authentication provider, you have to add the configuration to your newly added plugins. To do so here are the steps

1

Configure your google developer console

2

Go to your medusa-config.js

3

Check that the variables are set with the appropriate values

const BACKEND_URL = process.env.BACKEND_URL || "localhost:9000"
const ADMIN_URL = process.env.ADMIN_URL || "localhost:7000"
const STORE_URL = process.env.STORE_URL || "localhost:8000"
 
const GoogleClientId = process.env.GOOGLE_CLIENT_ID || ""
const GoogleClientSecret = process.env.GOOGLE_CLIENT_SECRET || ""

Then in your plugins collections, if you did not already inserted the plugin, add the following otherwise, you can just add the google options to your auth plugin options

{
    resolve: "medusa-plugin-auth",
    /** @type {import('medusa-plugin-auth').AuthOptions} */
    options: {
        // strict: "all", // or "none" or "store" or "admin"
        google: {
            clientID: GoogleClientId,
            clientSecret: GoogleClientSecret,
 
            admin: {
                callbackUrl:`${BACKEND_URL}/admin/auth/google/cb`,
                failureRedirect: `${ADMIN_URL}/login`,
 
				// The success redirect can be overriden from the client by adding a query param `?redirectTo=your_url` to the auth url
				// This query param will have the priority over this configuration
                successRedirect: `${ADMIN_URL}/`,
 
                // authPath: '/admin/auth/google',
                // authCallbackPath: '/admin/auth/google/cb',
                // expiresIn: 24 * 60 * 60 * 1000,
                // verifyCallback: (container, req, accessToken, refreshToken, profile, strict) => {
                //    // implement your custom verify callback here if you need it
                // }
            },
 
            store: {
                callbackUrl:`${BACKEND_URL}/store/auth/google/cb`,
                failureRedirect: `${STORE_URL}/login`,
 
				// The success redirect can be overriden from the client by adding a query param `?redirectTo=your_url` to the auth url
				// This query param will have the priority over this configuration
                successRedirect: `${STORE_URL}/`,
 
                // authPath: '/store/auth/google',
                // authCallbackPath: '/store/auth/google/cb',
                // expiresIn: 24 * 60 * 60 * 1000,
                // verifyCallback: (container, req, accessToken, refreshToken, profile, strict) => {
                //    // implement your custom verify callback here if you need it
                // }
            }
        }
    }
}

The options that are commented are optional and the value that you see are the default values

4

Update your client to add the authentication action

<a type="button" href=${medusa_url}/${authPath} className="text-white bg-[#4285F4] hover:bg-[#4285F4]/90 focus:ring-4 focus:outline-none focus:ring-[#4285F4]/50 font-medium rounded-lg text-sm px-5 py-2.5 text-center inline-flex items-center dark:focus:ring-[#4285F4]/55 mr-2 mb-2">
  <svg className="mr-2 -ml-1 w-4 h-4" aria-hidden="true" focusable="false" data-prefix="fab" data-icon="google" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 488 512"><path fill="currentColor" d="M488 261.8C488 403.3 391.1 504 248 504 110.8 504 0 393.2 0 256S110.8 8 248 8c66.8 0 123 24.5 166.3 64.9l-67.5 64.9C258.5 52.6 94.3 116.6 94.3 256c0 86.5 69.1 156.6 153.7 156.6 98.2 0 135-70.4 140.8-106.9H248v-85.3h236.1c2.3 12.7 3.9 24.9 3.9 41.4z"></path></svg>
  Sign in with Google
</a>
  • medusa_url correspond to your backend server url (e.g http://localhost:9000)
  • authPath correspond to authPath configuration in your plugin (e.g admin/auth/google)

After authentication is successfull, the user will be redirected to the successRedirect url with a ?access_token=your_token query param and a session cookie will be set. Session will automatically be authenticated. The access token is a JWT that can be used with Authorization: Bearer <token> header to authenticate requests to the backend instead of using a session cookie.

Default behaviour

The default verifyCallback flow looks as follow (unless the strict option is changed to none or store or admin depending on the targeted domain)

  • for the admin
    • if the user trying to authenticate exists
      • then we are looking in the metadata to find if the strategy identifier is present in authProvider.
        • If it is not, the user authentication gets rejected.
        • In the case it is present, then the user authentication gets authorized.
    • if the user trying to authenticate does not exist, an unauthorized error will be returned
  • for the store
    • if the customer trying to authenticate exists
      • then we are looking in the metadata to find if the strategy identifier is present in authProvider.
        • If none are found, then the customer gets authenticated and can proceed and the metadata gets updated.
        • In the case another external authentication method have been used in the past, then an unauthorized will be returned.
    • if the customer trying to authenticate does not exist, a new customer will be created with a randomly generated password and the authentication flow follow the previous point

Request only access token in a JSON response

If you are using your Medusa application with a SPA or mobile frontend, you can request opt to receive the access token in a JSON response instead of a redirect.

To do this, you have to add ?returnAccessToken=true query parameter to your authentication call. Your authentication URL will then look like this: ${medusa_url}/${authPath}?returnAccessToken=true

The response will look like this:

{
    access_token: "<your-jwt-token>"
}
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