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paypal.go
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paypal.go
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// Package paypal implements the OAuth2 protocol for authenticating users through paypal.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package paypal
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
const (
sandbox string = "sandbox"
envKey string = "PAYPAL_ENV"
//Endpoints for paypal sandbox env
authURLSandbox string = "https://www.sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize"
tokenURLSandbox string = "https://www.sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/tokenservice"
endpointProfileSandbox string = "https://www.sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/userinfo"
//Endpoints for paypal production env
authURLProduction string = "https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize"
tokenURLProduction string = "https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/tokenservice"
endpointProfileProduction string = "https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/userinfo"
)
// Provider is the implementation of `goth.Provider` for accessing Paypal.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
profileURL string
}
// New creates a new Paypal provider and sets up important connection details.
// You should always call `paypal.New` to get a new provider. Never try to
// create one manually.
func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
paypalEnv := os.Getenv(envKey)
authURL := authURLProduction
tokenURL := tokenURLProduction
profileEndPoint := endpointProfileProduction
if paypalEnv == sandbox {
authURL = authURLSandbox
tokenURL = tokenURLSandbox
profileEndPoint = endpointProfileSandbox
}
return NewCustomisedURL(clientKey, secret, callbackURL, authURL, tokenURL, profileEndPoint, scopes...)
}
// NewCustomisedURL is similar to New(...) but can be used to set custom URLs to connect to
func NewCustomisedURL(clientKey, secret, callbackURL, authURL, tokenURL, profileURL string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "paypal",
profileURL: profileURL,
}
p.config = newConfig(p, authURL, tokenURL, 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 paypal package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Paypal 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 Paypal 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 := p.Client().Get(p.profileURL + "?schema=openid&access_token=" + url.QueryEscape(sess.AccessToken))
if err != nil {
if response != nil {
response.Body.Close()
}
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, authURL, tokenURL string, 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", "email")
}
return c
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
Name string `json:"name"`
Address struct {
Locality string `json:"locality"`
} `json:"address"`
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.UserID = u.ID
user.Location = u.Address.Locality
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
}