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// Package amazon implements the OAuth2 protocol for authenticating users through amazon.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package amazon
import (
"bytes"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"net/url"
"github.com/markbates/goth"
"golang.org/x/oauth2"
"fmt"
)
const (
authURL string = "https://www.amazon.com/ap/oa"
tokenURL string = "https://api.amazon.com/auth/o2/token"
endpointProfile string = "https://api.amazon.com/user/profile"
)
// Provider is the implementation of `goth.Provider` for accessing Amazon.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// New creates a new Amazon provider and sets up important connection details.
// You should always call `amazon.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: "amazon",
}
p.config = newConfig(p, scopes)
return p
}
func (p *Provider) Client() *http.Client {
return goth.HTTPClientWithFallBack(p.HTTPClient)
}
// 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
}
// Debug is a no-op for the amazon package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Amazon 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 Amazon 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 := goth.HTTPClientWithFallBack(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 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)
}
} else {
c.Scopes = append(c.Scopes, "profile", "postal_code")
}
return c
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
Name string `json:"name"`
Location string `json:"postal_code"`
Email string `json:"email"`
ID string `json:"user_id"`
}{}
err := json.NewDecoder(r).Decode(&u)
if err != nil {
return err
}
user.Email = u.Email
user.Name = u.Name
user.NickName = u.Name
user.UserID = u.ID
user.Location = u.Location
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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