forked from markbates/goth
/
gitlab.go
155 lines (136 loc) · 3.9 KB
/
gitlab.go
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// Package gitlab implements the OAuth2 protocol for authenticating users through gitlab.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package gitlab
import (
"bytes"
"encoding/json"
"github.com/jtolds/goth"
"golang.org/x/oauth2"
"io"
"io/ioutil"
"net/http"
"net/url"
"strconv"
)
// These vars define the Authentication, Token, and Profile URLS for Gitlab. If
// using Gitlab CE or EE, you should change these values before calling New.
//
// Examples:
// gitlab.AuthURL = "https://gitlab.acme.com/oauth/authorize
// gitlab.TokenURL = "https://gitlab.acme.com/oauth/token
// gitlab.ProfileURL = "https://gitlab.acme.com/api/v3/user
var (
AuthURL = "https://gitlab.com/oauth/authorize"
TokenURL = "https://gitlab.com/oauth/token"
ProfileURL = "https://gitlab.com/api/v3/user"
)
// Provider is the implementation of `goth.Provider` for accessing Gitlab.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
config *oauth2.Config
}
// New creates a new Gitlab provider and sets up important connection details.
// You should always call `gitlab.New` to get a new provider. Never try to
// create one manually.
func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
}
p.config = newConfig(p, scopes)
return p
}
// Name is the name used to retrieve this provider later.
func (p *Provider) Name() string {
return "gitlab"
}
// Debug is a no-op for the gitlab package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Gitlab 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 Gitlab 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,
}
response, err := http.Get(ProfileURL + "?access_token=" + url.QueryEscape(sess.AccessToken))
if err != nil {
if response != nil {
response.Body.Close()
}
return user, err
}
defer response.Body.Close()
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, 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:"name"`
Email string `json:"email"`
NickName string `json:"username"`
ID int `json:"id"`
AvatarURL string `json:"avatar_url"`
}{}
err := json.NewDecoder(r).Decode(&u)
if err != nil {
return err
}
user.Email = u.Email
user.Name = u.Name
user.NickName = u.NickName
user.UserID = strconv.Itoa(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(oauth2.NoContext, token)
newToken, err := ts.Token()
if err != nil {
return nil, err
}
return newToken, err
}