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// Package intercom implements the OAuth protocol for authenticating users through Intercom.
package intercom
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"strings"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
var (
authURL string = "https://app.intercom.io/oauth"
tokenURL string = "https://api.intercom.io/auth/eagle/token?client_secret=%s"
UserURL string = "https://api.intercom.io/me"
)
// New creates the new Intercom provider
func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "intercom",
}
p.config = newConfig(p, scopes)
return p
}
// Provider is the implementation of `goth.Provider` for accessing Intercom
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// 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 intercom package
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Intercom for an authentication end-point
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
url := p.config.AuthCodeURL(state)
session := &Session{
AuthURL: url,
}
return session, nil
}
// FetchUser will fetch basic information about Intercom admin
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
sess := session.(*Session)
user := goth.User{
AccessToken: sess.AccessToken,
Provider: p.Name(),
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)
}
request, err := http.NewRequest("GET", UserURL, nil)
if err != nil {
return user, err
}
request.Header.Add("Accept", "application/json")
request.Header.Add("User-Agent", "goth-intercom")
request.SetBasicAuth(sess.AccessToken, "")
response, err := p.Client().Do(request)
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 userFromReader(reader io.Reader, user *goth.User) error {
u := struct {
ID string `json:"id"`
Email string `json:"email"`
Name string `json:"name"`
Link string `json:"link"`
EmailVerified bool `json:"email_verified"`
Avatar struct {
URL string `json:"image_url"`
} `json:"avatar"`
}{}
err := json.NewDecoder(reader).Decode(&u)
if err != nil {
return err
}
user.Name = u.Name
user.FirstName, user.LastName = splitName(u.Name)
user.Email = u.Email
user.AvatarURL = u.Avatar.URL
user.UserID = u.ID
return err
}
func splitName(name string) (string, string) {
nameSplit := strings.SplitN(name, " ", 2)
firstName := nameSplit[0]
var lastName string
if len(nameSplit) == 2 {
lastName = nameSplit[1]
}
return firstName, lastName
}
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: fmt.Sprintf(tokenURL, provider.Secret),
},
}
return c
}
// RefreshToken refresh token is not provided by Intercom
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
return nil, errors.New("Refresh token is not provided by Intercom")
}
// RefreshTokenAvailable refresh token is not provided by Intercom
func (p *Provider) RefreshTokenAvailable() bool {
return false
}
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