forked from markbates/goth
/
github.go
207 lines (180 loc) · 5.21 KB
/
github.go
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// Package github implements the OAuth2 protocol for authenticating users through Github.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package github
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
// These vars define the Authentication, Token, and API URLS for GitHub. If
// using GitHub enterprise you should change these values before calling New.
//
// Examples:
// github.AuthURL = "https://github.acme.com/login/oauth/authorize
// github.TokenURL = "https://github.acme.com/login/oauth/access_token
// github.ProfileURL = "https://github.acme.com/api/v3/user
// github.EmailURL = "https://github.acme.com/api/v3/user/emails
var (
AuthURL = "https://github.com/login/oauth/authorize"
TokenURL = "https://github.com/login/oauth/access_token"
ProfileURL = "https://api.github.com/user"
EmailURL = "https://api.github.com/user/emails"
)
// New creates a new Github provider, and sets up important connection details.
// You should always call `github.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
}
// Provider is the implementation of `goth.Provider` for accessing Github.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
config *oauth2.Config
}
// Name is the name used to retrieve this provider later.
func (p *Provider) Name() string {
return "github"
}
// Debug is a no-op for the github package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Github for an authentication end-point.
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
url := p.config.AuthCodeURL(state)
session := &Session{
AuthURL: url,
}
return session, nil
}
// FetchUser will go to Github 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(),
}
response, err := http.Get(ProfileURL + "?access_token=" + url.QueryEscape(sess.AccessToken))
if err != nil {
return user, err
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return user, fmt.Errorf("GitHub API responded with a %d trying to fetch user information", 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)
if err != nil {
return user, err
}
if user.Email == "" {
for _, scope := range p.config.Scopes {
if strings.TrimSpace(scope) == "user" || strings.TrimSpace(scope) == "user:email" {
user.Email, err = getPrivateMail(p, sess)
if err != nil {
return user, err
}
break
}
}
}
return user, err
}
func userFromReader(reader io.Reader, user *goth.User) error {
u := struct {
ID int `json:"id"`
Email string `json:"email"`
Bio string `json:"bio"`
Name string `json:"name"`
Login string `json:"login"`
Picture string `json:"avatar_url"`
Location string `json:"location"`
}{}
err := json.NewDecoder(reader).Decode(&u)
if err != nil {
return err
}
user.Name = u.Name
user.NickName = u.Login
user.Email = u.Email
user.Description = u.Bio
user.AvatarURL = u.Picture
user.UserID = strconv.Itoa(u.ID)
user.Location = u.Location
return err
}
func getPrivateMail(p *Provider, sess *Session) (email string, err error) {
response, err := http.Get(EmailURL + "?access_token=" + url.QueryEscape(sess.AccessToken))
if err != nil {
if response != nil {
response.Body.Close()
}
return email, err
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return email, fmt.Errorf("GitHub API responded with a %d trying to fetch user email", response.StatusCode)
}
var mailList = []struct {
Email string `json:"email"`
Primary bool `json:"primary"`
Verified bool `json:"verified"`
}{}
err = json.NewDecoder(response.Body).Decode(&mailList)
if err != nil {
return email, err
}
for _, v := range mailList {
if v.Primary && v.Verified {
return v.Email, nil
}
}
// can't get primary email - shouldn't be possible
return
}
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{},
}
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
return c
}
//RefreshToken refresh token is not provided by github
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
return nil, errors.New("Refresh token is not provided by github")
}
//RefreshTokenAvailable refresh token is not provided by github
func (p *Provider) RefreshTokenAvailable() bool {
return false
}