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// Package auth0 implements the OAuth2 protocol for authenticating users through uber.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package auth0
import (
"bytes"
"encoding/json"
"io"
"net/http"
"github.com/markbates/goth"
"golang.org/x/oauth2"
"fmt"
)
const (
authEndpoint string = "/oauth/authorize"
tokenEndpoint string = "/oauth/token"
endpointProfile string = "/userinfo"
protocol string = "https://"
)
// Provider is the implementation of `goth.Provider` for accessing Auth0.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
Domain string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
type auth0UserResp struct {
Name string `json:"name"`
NickName string `json:"nickname"`
Email string `json:"email"`
UserID string `json:"user_id"`
AvatarURL string `json:"picture"`
}
// New creates a new Auth0 provider and sets up important connection details.
// You should always call `auth0.New` to get a new provider. Never try to
// create one manually.
func New(clientKey, secret, callbackURL string, auth0Domain string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
Domain: auth0Domain,
providerName: "auth0",
}
p.config = newConfig(p, 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 auth0 package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Auth0 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 Auth0 and access basic information about the user.
// the full response will be included in RawData
// https://auth0.com/docs/api/authentication#get-user-info
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
s := session.(*Session)
user := goth.User{
AccessToken: s.AccessToken,
Provider: p.Name(),
RefreshToken: s.RefreshToken,
ExpiresAt: s.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)
}
userProfileURL := protocol + p.Domain + endpointProfile
req, err := http.NewRequest("GET", userProfileURL, nil)
if err != nil {
return user, err
}
req.Header.Set("Authorization", "Bearer "+s.AccessToken)
resp, err := p.Client().Do(req)
if err != nil {
if resp != nil {
resp.Body.Close()
}
return user, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, resp.StatusCode)
}
err = userFromReader(resp.Body, &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: protocol + provider.Domain + authEndpoint,
TokenURL: protocol + provider.Domain + tokenEndpoint,
},
Scopes: []string{},
}
if len(scopes) > 0 {
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
} else {
c.Scopes = append(c.Scopes, "profile", "openid")
}
return c
}
func userFromReader(r io.Reader, user *goth.User) error {
var rawData map[string]interface{}
buf := new(bytes.Buffer)
buf.ReadFrom(r)
err := json.Unmarshal(buf.Bytes(), &rawData)
if err != nil {
return err
}
u := auth0UserResp{}
err = json.Unmarshal(buf.Bytes(), &u)
if err != nil {
return err
}
user.Email = u.Email
user.Name = u.Name
user.NickName = u.NickName
user.UserID = u.UserID
user.AvatarURL = u.AvatarURL
user.RawData = rawData
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
}
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