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// Package google implements the OAuth2 protocol for authenticating users
// through Google.
package google
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
const endpointProfile string = "https://www.googleapis.com/oauth2/v2/userinfo"
// New creates a new Google provider, and sets up important connection details.
// You should always call `google.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,
providerName: "google",
}
p.config = newConfig(p, scopes)
return p
}
// Provider is the implementation of `goth.Provider` for accessing Google.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
authCodeOptions []oauth2.AuthCodeOption
providerName string
}
// 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
}
// Client returns an HTTP client to be used in all fetch operations.
func (p *Provider) Client() *http.Client {
return goth.HTTPClientWithFallBack(p.HTTPClient)
}
// Debug is a no-op for the google package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Google for an authentication endpoint.
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
url := p.config.AuthCodeURL(state, p.authCodeOptions...)
session := &Session{
AuthURL: url,
}
return session, nil
}
type googleUser struct {
ID string `json:"id"`
Email string `json:"email"`
Name string `json:"name"`
FirstName string `json:"given_name"`
LastName string `json:"family_name"`
Link string `json:"link"`
Picture string `json:"picture"`
}
// FetchUser will go to Google 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)
}
response, err := p.Client().Get(endpointProfile + "?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("%s responded with a %d trying to fetch user information", p.providerName, response.StatusCode)
}
responseBytes, err := ioutil.ReadAll(response.Body)
if err != nil {
return user, err
}
var u googleUser
if err := json.Unmarshal(responseBytes, &u); err != nil {
return user, err
}
// Extract the user data we got from Google into our goth.User.
user.Name = u.Name
user.FirstName = u.FirstName
user.LastName = u.LastName
user.NickName = u.Name
user.Email = u.Email
user.AvatarURL = u.Picture
user.UserID = u.ID
// Google provides other useful fields such as 'hd'; get them from RawData
if err := json.Unmarshal(responseBytes, &user.RawData); err != nil {
return user, err
}
return user, nil
}
func newConfig(provider *Provider, scopes []string) *oauth2.Config {
c := &oauth2.Config{
ClientID: provider.ClientKey,
ClientSecret: provider.Secret,
RedirectURL: provider.CallbackURL,
Endpoint: Endpoint,
Scopes: []string{},
}
if len(scopes) > 0 {
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
} else {
c.Scopes = []string{"email"}
}
return c
}
// 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
}
// SetPrompt sets the prompt values for the google OAuth call. Use this to
// force users to choose and account every time by passing "select_account",
// for example.
// See https://developers.google.com/identity/protocols/OpenIDConnect#authenticationuriparameters
func (p *Provider) SetPrompt(prompt ...string) {
if len(prompt) == 0 {
return
}
p.authCodeOptions = append(p.authCodeOptions, oauth2.SetAuthURLParam("prompt", strings.Join(prompt, " ")))
}
// SetHostedDomain sets the hd parameter for google OAuth call.
// Use this to force user to pick user from specific hosted domain.
// See https://developers.google.com/identity/protocols/oauth2/openid-connect#hd-param
func (p *Provider) SetHostedDomain(hd string) {
if hd == "" {
return
}
p.authCodeOptions = append(p.authCodeOptions, oauth2.SetAuthURLParam("hd", hd))
}
// SetLoginHint sets the login_hint parameter for the google OAuth call.
// Use this to prompt the user to login with a specific account.
// See https://developers.google.com/identity/protocols/oauth2/openid-connect#login-hint
func (p *Provider) SetLoginHint(loginHint string) {
if loginHint == "" {
return
}
p.authCodeOptions = append(p.authCodeOptions, oauth2.SetAuthURLParam("login_hint", loginHint))
}
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