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// Package heroku implements the OAuth2 protocol for authenticating users through heroku.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package heroku
import (
"encoding/json"
"io"
"net/http"
"github.com/markbates/goth"
"golang.org/x/oauth2"
"fmt"
)
const (
authURL string = "https://id.heroku.com/oauth/authorize"
tokenURL string = "https://id.heroku.com/oauth/token"
endpointProfile string = "https://api.heroku.com/account"
)
// Provider is the implementation of `goth.Provider` for accessing Heroku.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// New creates a new Heroku provider and sets up important connection details.
// You should always call `heroku.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: "heroku",
}
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 heroku package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Heroku 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 Heroku and access basic information about the user.
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)
}
req, err := http.NewRequest("GET", endpointProfile, 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: authURL,
TokenURL: tokenURL,
},
Scopes: []string{},
}
if len(scopes) > 0 {
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
}
return c
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
Name string `json:"name"`
Email string `json:"email"`
ID string `json:"id"`
}{}
err := json.NewDecoder(r).Decode(&u)
if err != nil {
return err
}
user.Email = u.Email
user.Name = u.Name
user.UserID = u.ID
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(goth.ContextForClient(p.Client()), token)
newToken, err := ts.Token()
if err != nil {
return nil, err
}
return newToken, err
}
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