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salesforce.go
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salesforce.go
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// Package salesforce implements the OAuth2 protocol for authenticating users through salesforce.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package salesforce
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
// These vars define the Authentication and Token URLS for Salesforce. If
// using Salesforce Community, you should change these values before calling New.
//
// Examples:
//
// salesforce.AuthURL = "https://salesforce.acme.com/services/oauth2/authorize
// salesforce.TokenURL = "https://salesforce.acme.com/services/oauth2/token
var (
AuthURL = "https://login.salesforce.com/services/oauth2/authorize"
TokenURL = "https://login.salesforce.com/services/oauth2/token"
// endpointProfile string = "https://api.salesforce.com/2.0/users/me"
)
// Provider is the implementation of `goth.Provider` for accessing Salesforce.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// New creates a new Salesforce provider and sets up important connection details.
// You should always call `salesforce.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: "salesforce",
}
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 salesforce package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Salesforce 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 Salesforce 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,
}
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)
}
url, err := url.Parse(s.ID)
if err != nil {
return user, err
}
// creating dynamic url to retrieve user information
userURL := url.Scheme + "://" + url.Host + "/" + url.Path
req, err := http.NewRequest("GET", userURL, nil)
if err != nil {
return user, err
}
req.Header.Set("Authorization", "Bearer "+s.AccessToken)
resp, err := p.Client().Do(req)
if err != nil {
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 {
var rawData map[string]interface{}
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(r)
if err != nil {
return err
}
err = json.Unmarshal(buf.Bytes(), &rawData)
if err != nil {
return err
}
u := struct {
Name string `json:"display_name"`
NickName string `json:"nick_name"`
Location string `json:"addr_country"`
Email string `json:"email"`
AvatarURL string `json:"photos.picture"`
ID string `json:"user_id"`
}{}
err = json.Unmarshal(buf.Bytes(), &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
user.RawData = rawData
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
}