Spotify

This is a Go wrapper for working with Spotify's Web API.

It aims to support every task listed in the Web API Endpoint Reference, located here.

By using this library you agree to Spotify's Developer Terms of Use.

Installation

To install the library, simply

go get github.com/cappfm/spotify-go/v2

Authentication

Spotify uses OAuth2 for authentication and authorization.
As of May 29, 2017 all Web API endpoints require an access token.

You can authenticate using a client credentials flow, but this does not provide any authorization to access a user's private data. For most use cases, you'll want to use the authorization code flow. This package includes an Authenticator type to handle the details for you.

Start by registering your application at the following page:

https://developer.spotify.com/my-applications/.

You'll get a client ID and secret key for your application. An easy way to provide this data to your application is to set the SPOTIFY_ID and SPOTIFY_SECRET environment variables. If you choose not to use environment variables, you can provide this data manually.

// the redirect URL must be an exact match of a URL you've registered for your application
// scopes determine which permissions the user is prompted to authorize
auth := spotifyauth.New(spotifyauth.WithRedirectURL(redirectURL), spotifyauth.WithScopes(spotifyauth.ScopeUserReadPrivate))

// get the user to this URL - how you do that is up to you
// you should specify a unique state string to identify the session
url := auth.AuthURL(state)

// the user will eventually be redirected back to your redirect URL
// typically you'll have a handler set up like the following:
func redirectHandler(w http.ResponseWriter, r *http.Request) {
      // use the same state string here that you used to generate the URL
      token, err := auth.Token(r.Context(), state, r)
      if err != nil {
            http.Error(w, "Couldn't get token", http.StatusNotFound)
            return
      }
      // create a client using the specified token
      client := spotify.New(auth.Client(r.Context(), token))

      // the client can now be used to make authenticated requests
}

You may find the following resources useful:

1. Spotify's Web API Authorization Guide: https://developer.spotify.com/web-api/authorization-guide/

2. Go's OAuth2 package: https://godoc.org/golang.org/x/oauth2/google

Helpful Hints

Automatic Retries

The API will throttle your requests if you are sending them too rapidly. The client can be configured to wait and re-attempt the request. To enable this, set the AutoRetry field on the Client struct to true.

For more information, see Spotify rate-limits.

API Examples

Examples of the API can be found in the examples directory.

You may find tools such as Spotify's Web API Console or Rapid API valuable for experimenting with the API.

Missing data in responses

It's extremely common that when there is no market information available in your request, that the Spotify API will simply return null for details about a track or episode.

This typically occurs when you are just using an application's auth token, and aren't impersonating a user via oauth. As when you are using a token associated with a user, the user's market seems to be extracted from their profile and used when producing the response.