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// Package mastodon implements the OAuth2 protocol for authenticating users through Mastodon.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package mastodon
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"strings"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
// Mastodon.social is the flagship instance of mastodon
var (
InstanceURL = "https://mastodon.social/"
)
// Provider is the implementation of `goth.Provider` for accessing Mastodon.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
authURL string
tokenURL string
profileURL string
}
// New creates a new Mastodon provider and sets up important connection details.
// You should always call `mastodon.New` to get a new provider. Never try to
// create one manually.
func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
return NewCustomisedURL(clientKey, secret, callbackURL, InstanceURL, scopes...)
}
// NewCustomisedURL is similar to New(...) but can be used to set custom URLs to connect to
func NewCustomisedURL(clientKey, secret, callbackURL, instanceURL string, scopes ...string) *Provider {
instanceURL = fmt.Sprintf("%s/", strings.TrimSuffix(instanceURL, "/"))
profileURL := fmt.Sprintf("%sapi/v1/accounts/verify_credentials", instanceURL)
authURL := fmt.Sprintf("%soauth/authorize", instanceURL)
tokenURL := fmt.Sprintf("%soauth/token", instanceURL)
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "mastodon",
profileURL: profileURL,
}
p.config = newConfig(p, authURL, tokenURL, scopes)
return p
}
// Name is the name used to retrieve this provider later.
func (p *Provider) Name() string {
return p.providerName
}
// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
func (p *Provider) SetName(name string) {
p.providerName = name
}
func (p *Provider) Client() *http.Client {
return goth.HTTPClientWithFallBack(p.HTTPClient)
}
// Debug is a no-op for the Mastodon package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Mastodon for an authentication end-point.
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
return &Session{
AuthURL: p.config.AuthCodeURL(state),
}, nil
}
// FetchUser will go to Mastodon and access basic information about the user.
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
sess := session.(*Session)
user := goth.User{
AccessToken: sess.AccessToken,
Provider: p.Name(),
RefreshToken: sess.RefreshToken,
ExpiresAt: sess.ExpiresAt,
}
if user.AccessToken == "" {
// data is not yet retrieved since accessToken is still empty
return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
}
req, err := http.NewRequest("GET", p.profileURL, nil)
if err != nil {
return user, err
}
req.Header.Add("Authorization", "Bearer "+sess.AccessToken)
response, err := p.Client().Do(req)
if err != nil {
return user, err
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, response.StatusCode)
}
bits, err := ioutil.ReadAll(response.Body)
if err != nil {
return user, err
}
err = json.NewDecoder(bytes.NewReader(bits)).Decode(&user.RawData)
if err != nil {
return user, err
}
err = userFromReader(bytes.NewReader(bits), &user)
return user, err
}
func newConfig(provider *Provider, authURL, tokenURL string, scopes []string) *oauth2.Config {
c := &oauth2.Config{
ClientID: provider.ClientKey,
ClientSecret: provider.Secret,
RedirectURL: provider.CallbackURL,
Endpoint: oauth2.Endpoint{
AuthURL: authURL,
TokenURL: tokenURL,
},
Scopes: []string{},
}
if len(scopes) > 0 {
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
}
return c
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
Name string `json:"display_name"`
NickName string `json:"username"`
ID string `json:"id"`
AvatarURL string `json:"avatar"`
}{}
err := json.NewDecoder(r).Decode(&u)
if err != nil {
return err
}
user.Name = u.Name
if len(user.Name) == 0 {
user.Name = u.NickName
}
user.NickName = u.NickName
user.UserID = u.ID
user.AvatarURL = u.AvatarURL
return nil
}
//RefreshTokenAvailable refresh token is provided by auth provider or not
func (p *Provider) RefreshTokenAvailable() bool {
return true
}
//RefreshToken get new access token based on the refresh token
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
token := &oauth2.Token{RefreshToken: refreshToken}
ts := p.config.TokenSource(goth.ContextForClient(p.Client()), token)
newToken, err := ts.Token()
if err != nil {
return nil, err
}
return newToken, err
}
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