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// Package yammer implements the OAuth2 protocol for authenticating users through yammer.
// This package can be used as a reference implementation of an OAuth2 provider for Goth.
package yammer
import (
"errors"
"net/http"
"strconv"
"github.com/markbates/goth"
"golang.org/x/oauth2"
"fmt"
"io/ioutil"
"encoding/json"
"bytes"
)
const (
authURL string = "https://www.yammer.com/oauth2/authorize"
tokenURL string = "https://www.yammer.com/oauth2/access_token"
endpointProfile string = "https://www.yammer.com/api/v1/users/current.json"
)
// Provider is the implementation of `goth.Provider` for accessing Yammer.
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// New creates a new Yammer provider and sets up important connection details.
// You should always call `yammer.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: "yammer",
}
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 yammer package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Yammer 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 Yammer 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(),
}
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 "+sess.AccessToken)
response, err := p.Client().Do(req)
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 = populateUser(user.RawData, &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 populateUser(userMap map[string]interface{}, user *goth.User) error {
user.Email = stringValue(userMap["email"])
user.Name = stringValue(userMap["full_name"])
user.NickName = stringValue(userMap["full_name"])
user.UserID = strconv.FormatFloat(userMap["id"].(float64), 'f', -1, 64)
user.Location = stringValue(userMap["location"])
return nil
}
func stringValue(v interface{}) string {
if v == nil {
return ""
}
return v.(string)
}
//RefreshToken refresh token is not provided by yammer
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
return nil, errors.New("Refresh token is not provided by yammer")
}
//RefreshTokenAvailable refresh token is not provided by yammer
func (p *Provider) RefreshTokenAvailable() bool {
return false
}
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