github.com/fabiofalci/spotify

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/zmb3/spotify

Authentication

Most of the Web API functionality is available without authenticating. However, authenticated users benefit from increased rate limits.

Features that access a user's private data require authorization. All functions requiring authorization are explicitly marked as such in the godoc.

Spotify uses OAuth2 for authentication, which typically requires the user to login via a web browser. This package includes an Authenticator type to handle the details for you.

Start by getting 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 := spotify.NewAuthenticator(redirectURL, spotify.ScopeUserReadPrivate)

// if you didn't store your ID and secret key in the specified environment variables,
// you can set them manually here
auth.SetAuthInfo(clientID, secretKey)

// 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(state, r)
      if err != nil {
            http.Error(w, "Couldn't get token", http.StatusNotFound)
            return
      }
      // create a client using the specified token
      client := auth.NewClient(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

Default Client

For API calls that require authorization, you should create your own spotify.Client using an Authenticator. For calls that don't require authorization, package level wrapper functions are provided (see spotify.Search for example)

These functions just proxy through spotify.DefaultClient, similar to the way the net/http package works.

Optional Parameters

Many of the functions in this package come in two forms - a simple version that omits optional parameters and uses reasonable defaults, and a more sophisticated version that accepts additional parameters. The latter is suffixed with Opt to indicate that it accepts some optional parameters.

API Examples

Search

The search functionality returns a set of results, grouped by type (album, artist, playlist, and track). You can search for more than one type of item with a single search. For example, to search for holiday playlists and albums:

results, err := spotify.Search("holiday", SearchTypePlaylist|SearchTypeAlbum)
// error handling omitted

// handle album results
if results.Albums != nil {
    for _, item := range results.Albums.Albums {
        fmt.Println("Album: ", item.Name)
    }
}
// handle playlist results
if results.Playlists != nil {
    for _, item := range results.Playlists.Playlists {
        fmt.Println("Playlist: ", item.Name)
    }
}

The search query supports a variety of queries. Refer to the godoc for more information.

Users

To get information about another Spotify user:

user, err := spotify.GetUsersPublicProfile("user-id")
// err handling omitted
fmt.Println(user.DisplayName)
fmt.Println(user.Followers.Count, "followers")

To get information about the current user, you must authenticate first:

c := spotify.Client{}
c.HTTP = getHTTPClient()
me, err := c.CurrentUser()
// error handling omitted

fmt.Println(me.ID, me.Email, me.DisplayName)

To check if a user follows another user:

// authentication omitted
follows, err := c.CurrentUserFollows("user", "<spotify_id_here")
// error handling omitted
if follows[0] {
    fmt.Println("Yes, the current user follows this user.")
} else {
    fmt.Println("No, the current user does not follow this user")
}

You can check multiple items in the same call (and this works for artists too):

// authentication omitted
follows, err := c.CurrentUserFollows("artist", "artist_0_id", "artist_1_id", "artist_2_id")
// error handling omitted
if follows[0] {
    fmt.Println("The user follows artist 0")
}
if follows[1] {
    fmt.Println("The user follows artist 1")
}
if follows[2] {
    fmt.Println("The user follows artist 2")
}

Tracks

To get catalog information for a track:

track, err := spotify.GetTrack("track_id_here")
// error handling omitted
fmt.Printf("%s is %d milliseconds long and has a popularity of %d\n",
    track.Name, track.Duration, track.Popularity)

Playlists

To get a list of Spotify's featured playlists, authenticate first, and then:

msg, page, err := c.FeaturedPlaylists()
// error handling omitted

for _, playlist := range page.Playlists {
    fmt.Println(playlist.Name, playlist.Owner)
}