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// Package twitter implements the OAuth protocol for authenticating users through Twitter.
// This package can be used as a reference implementation of an OAuth provider for Goth.
package twitter
import (
"bytes"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"fmt"
"github.com/markbates/goth"
"github.com/mrjones/oauth"
"golang.org/x/oauth2"
)
var (
requestURL = "https://api.twitter.com/oauth/request_token"
authorizeURL = "https://api.twitter.com/oauth/authorize"
authenticateURL = "https://api.twitter.com/oauth/authenticate"
tokenURL = "https://api.twitter.com/oauth/access_token"
endpointProfile = "https://api.twitter.com/1.1/account/verify_credentials.json"
)
// New creates a new Twitter provider, and sets up important connection details.
// You should always call `twitter.New` to get a new Provider. Never try to create
// one manually.
//
// If you'd like to use authenticate instead of authorize, use NewAuthenticate instead.
func New(clientKey, secret, callbackURL string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "twitter",
}
p.consumer = newConsumer(p, authorizeURL)
return p
}
// NewAuthenticate is the almost same as New.
// NewAuthenticate uses the authenticate URL instead of the authorize URL.
func NewAuthenticate(clientKey, secret, callbackURL string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "twitter",
}
p.consumer = newConsumer(p, authenticateURL)
return p
}
// Provider is the implementation of `goth.Provider` for accessing Twitter.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
debug bool
consumer *oauth.Consumer
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
}
func (p *Provider) Client() *http.Client {
return goth.HTTPClientWithFallBack(p.HTTPClient)
}
// Debug sets the logging of the OAuth client to verbose.
func (p *Provider) Debug(debug bool) {
p.debug = debug
}
// BeginAuth asks Twitter for an authentication end-point and a request token for a session.
// Twitter does not support the "state" variable.
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
requestToken, url, err := p.consumer.GetRequestTokenAndUrl(p.CallbackURL)
session := &Session{
AuthURL: url,
RequestToken: requestToken,
}
return session, err
}
// FetchUser will go to Twitter and access basic information about the user.
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
sess := session.(*Session)
user := goth.User{
Provider: p.Name(),
}
if sess.AccessToken == nil {
// 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.consumer.Get(
endpointProfile,
map[string]string{"include_entities": "false", "skip_status": "true", "include_email": "true"},
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)
}
bits, err := ioutil.ReadAll(response.Body)
err = json.NewDecoder(bytes.NewReader(bits)).Decode(&user.RawData)
if err != nil {
return user, err
}
user.Name = user.RawData["name"].(string)
user.NickName = user.RawData["screen_name"].(string)
if user.RawData["email"] != nil {
user.Email = user.RawData["email"].(string)
}
user.Description = user.RawData["description"].(string)
user.AvatarURL = user.RawData["profile_image_url"].(string)
user.UserID = user.RawData["id_str"].(string)
user.Location = user.RawData["location"].(string)
user.AccessToken = sess.AccessToken.Token
user.AccessTokenSecret = sess.AccessToken.Secret
return user, err
}
func newConsumer(provider *Provider, authURL string) *oauth.Consumer {
c := oauth.NewConsumer(
provider.ClientKey,
provider.Secret,
oauth.ServiceProvider{
RequestTokenUrl: requestURL,
AuthorizeTokenUrl: authURL,
AccessTokenUrl: tokenURL,
})
c.Debug(provider.debug)
return c
}
//RefreshToken refresh token is not provided by twitter
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
return nil, errors.New("Refresh token is not provided by twitter")
}
//RefreshTokenAvailable refresh token is not provided by twitter
func (p *Provider) RefreshTokenAvailable() bool {
return false
}
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