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// Package instagram implements the OAuth2 protocol for authenticating users through Instagram.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package instagram
import (
"bytes"
"encoding/json"
"errors"
"io"
"io/ioutil"
"net/http"
"net/url"
"github.com/markbates/goth"
"golang.org/x/oauth2"
"fmt"
)
var (
authURL = "https://api.instagram.com/oauth/authorize/"
tokenURL = "https://api.instagram.com/oauth/access_token"
endPointProfile = "https://api.instagram.com/v1/users/self/"
)
// New creates a new Instagram provider, and sets up important connection details.
// You should always call `instagram.New` to get a new Provider. Never try to craete
// one manually.
func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "instagram",
}
p.config = newConfig(p, scopes)
return p
}
// Provider is the implementation of `goth.Provider` for accessing Instagram
type Provider struct {
ClientKey string
Secret string
CallbackURL string
UserAgent string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// Name is the name used to retrive 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 TODO
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Instagram 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 Instagram 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(),
}
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)
}
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 userFromReader(reader io.Reader, user *goth.User) error {
u := struct {
Data struct {
ID string `json:"id"`
UserName string `json:"username"`
FullName string `json:"full_name"`
ProfilePicture string `json:"profile_picture"`
Bio string `json:"bio"`
Website string `json:"website"`
Counts struct {
Media int `json:"media"`
Follows int `json:"follows"`
FollowedBy int `json:"followed_by"`
} `json:"counts"`
} `json:"data"`
}{}
err := json.NewDecoder(reader).Decode(&u)
if err != nil {
return err
}
user.UserID = u.Data.ID
user.Name = u.Data.UserName
user.NickName = u.Data.UserName
user.AvatarURL = u.Data.ProfilePicture
user.Description = u.Data.Bio
return err
}
func newConfig(p *Provider, scopes []string) *oauth2.Config {
c := &oauth2.Config{
ClientID: p.ClientKey,
ClientSecret: p.Secret,
RedirectURL: p.CallbackURL,
Endpoint: oauth2.Endpoint{
AuthURL: authURL,
TokenURL: tokenURL,
},
Scopes: []string{
"basic",
},
}
defaultScopes := map[string]struct{}{
"basic": {},
}
for _, scope := range scopes {
if _, exists := defaultScopes[scope]; !exists {
c.Scopes = append(c.Scopes, scope)
}
}
return c
}
//RefreshToken refresh token is not provided by instagram
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
return nil, errors.New("Refresh token is not provided by instagram")
}
//RefreshTokenAvailable refresh token is not provided by instagram
func (p *Provider) RefreshTokenAvailable() bool {
return false
}
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