mirror of
https://github.com/go-gitea/gitea.git
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* add discord auth * add vendor for discord * fix syntax error * make fmt * update version of goth in use * update markbates/goth
217 lines
5.5 KiB
Go
217 lines
5.5 KiB
Go
// Package facebook implements the OAuth2 protocol for authenticating users through Facebook.
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// This package can be used as a reference implementation of an OAuth2 provider for Goth.
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package facebook
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import (
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"bytes"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"strings"
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"github.com/markbates/goth"
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"golang.org/x/oauth2"
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)
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const (
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authURL string = "https://www.facebook.com/dialog/oauth"
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tokenURL string = "https://graph.facebook.com/oauth/access_token"
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endpointProfile string = "https://graph.facebook.com/me?fields="
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)
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// New creates a new Facebook provider, and sets up important connection details.
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// You should always call `facebook.New` to get a new Provider. Never try to create
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// one manually.
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func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
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p := &Provider{
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ClientKey: clientKey,
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Secret: secret,
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CallbackURL: callbackURL,
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providerName: "facebook",
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}
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p.config = newConfig(p, scopes)
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p.Fields = "email,first_name,last_name,link,about,id,name,picture,location"
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return p
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}
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// Provider is the implementation of `goth.Provider` for accessing Facebook.
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type Provider struct {
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ClientKey string
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Secret string
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CallbackURL string
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HTTPClient *http.Client
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Fields string
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config *oauth2.Config
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providerName string
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}
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// Name is the name used to retrieve this provider later.
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func (p *Provider) Name() string {
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return p.providerName
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}
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// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
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func (p *Provider) SetName(name string) {
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p.providerName = name
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}
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// SetCustomFields sets the fields used to return information
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// for a user.
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//
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// A list of available field values can be found at
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// https://developers.facebook.com/docs/graph-api/reference/user
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func (p *Provider) SetCustomFields(fields []string) *Provider {
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p.Fields = strings.Join(fields, ",")
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return p
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}
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func (p *Provider) Client() *http.Client {
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return goth.HTTPClientWithFallBack(p.HTTPClient)
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}
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// Debug is a no-op for the facebook package.
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func (p *Provider) Debug(debug bool) {}
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// BeginAuth asks Facebook for an authentication end-point.
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func (p *Provider) BeginAuth(state string) (goth.Session, error) {
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authUrl := p.config.AuthCodeURL(state)
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session := &Session{
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AuthURL: authUrl,
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}
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return session, nil
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}
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// FetchUser will go to Facebook and access basic information about the user.
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func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
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sess := session.(*Session)
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user := goth.User{
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AccessToken: sess.AccessToken,
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Provider: p.Name(),
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ExpiresAt: sess.ExpiresAt,
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}
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if user.AccessToken == "" {
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// data is not yet retrieved since accessToken is still empty
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return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
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}
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// always add appsecretProof to make calls more protected
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// https://github.com/markbates/goth/issues/96
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// https://developers.facebook.com/docs/graph-api/securing-requests
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hash := hmac.New(sha256.New, []byte(p.Secret))
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hash.Write([]byte(sess.AccessToken))
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appsecretProof := hex.EncodeToString(hash.Sum(nil))
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reqUrl := fmt.Sprint(
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endpointProfile,
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p.Fields,
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"&access_token=",
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url.QueryEscape(sess.AccessToken),
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"&appsecret_proof=",
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appsecretProof,
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)
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response, err := p.Client().Get(reqUrl)
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if err != nil {
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return user, err
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}
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defer response.Body.Close()
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if response.StatusCode != http.StatusOK {
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return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, response.StatusCode)
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}
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bits, err := ioutil.ReadAll(response.Body)
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if err != nil {
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return user, err
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}
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err = json.NewDecoder(bytes.NewReader(bits)).Decode(&user.RawData)
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if err != nil {
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return user, err
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}
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err = userFromReader(bytes.NewReader(bits), &user)
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return user, err
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}
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func userFromReader(reader io.Reader, user *goth.User) error {
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u := struct {
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ID string `json:"id"`
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Email string `json:"email"`
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About string `json:"about"`
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Name string `json:"name"`
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FirstName string `json:"first_name"`
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LastName string `json:"last_name"`
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Link string `json:"link"`
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Picture struct {
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Data struct {
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URL string `json:"url"`
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} `json:"data"`
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} `json:"picture"`
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Location struct {
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Name string `json:"name"`
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} `json:"location"`
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}{}
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err := json.NewDecoder(reader).Decode(&u)
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if err != nil {
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return err
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}
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user.Name = u.Name
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user.FirstName = u.FirstName
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user.LastName = u.LastName
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user.NickName = u.Name
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user.Email = u.Email
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user.Description = u.About
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user.AvatarURL = u.Picture.Data.URL
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user.UserID = u.ID
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user.Location = u.Location.Name
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return err
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}
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func newConfig(provider *Provider, scopes []string) *oauth2.Config {
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c := &oauth2.Config{
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ClientID: provider.ClientKey,
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ClientSecret: provider.Secret,
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RedirectURL: provider.CallbackURL,
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Endpoint: oauth2.Endpoint{
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AuthURL: authURL,
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TokenURL: tokenURL,
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},
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Scopes: []string{
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"email",
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},
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}
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defaultScopes := map[string]struct{}{
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"email": {},
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}
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for _, scope := range scopes {
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if _, exists := defaultScopes[scope]; !exists {
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c.Scopes = append(c.Scopes, scope)
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}
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}
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return c
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}
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//RefreshToken refresh token is not provided by facebook
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func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
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return nil, errors.New("Refresh token is not provided by facebook")
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}
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//RefreshTokenAvailable refresh token is not provided by facebook
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func (p *Provider) RefreshTokenAvailable() bool {
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return false
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}
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