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// Package linkedin implements the OAuth2 protocol for authenticating users through Linkedin.
package linkedin
import (
"encoding/json"
"errors"
"io"
"net/http"
"net/url"
"github.com/markbates/goth"
"golang.org/x/oauth2"
"fmt"
)
//more details about linkedin fields: https://developer.linkedin.com/documents/profile-fields
const (
authURL string = "https://www.linkedin.com/oauth/v2/authorization"
tokenURL string = "https://www.linkedin.com/oauth/v2/accessToken"
//userEndpoint requires scopes "r_basicprofile", "r_emailaddress"
userEndpoint string = "//api.linkedin.com/v1/people/~:(id,first-name,last-name,headline,location:(name),picture-url,email-address)"
)
// New creates a new linkedin provider, and sets up important connection details.
// You should always call `linkedin.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: "linkedin",
}
p.config = newConfig(p, scopes)
return p
}
// Provider is the implementation of `goth.Provider` for accessing Linkedin.
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 linkedin package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Linkedin 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 go to Linkedin 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(),
ExpiresAt: s.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)
}
req, err := http.NewRequest("GET", "", nil)
if err != nil {
return user, err
}
//add url as opaque to avoid escaping of "("
req.URL = &url.URL{
Scheme: "https",
Host: "api.linkedin.com",
Opaque: userEndpoint,
}
req.Header.Set("Authorization", "Bearer "+s.AccessToken)
req.Header.Add("x-li-format", "json") //request json response
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(io.TeeReader(resp.Body, os.Stdout), &user)
err = userFromReader(resp.Body, &user)
return user, err
}
func userFromReader(reader io.Reader, user *goth.User) error {
u := struct {
ID string `json:"id"`
Email string `json:"emailAddress"`
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
Headline string `json:"headline"`
PictureURL string `json:"pictureUrl"`
Location struct {
Name string `json:"name"`
} `json:"location"`
}{}
err := json.NewDecoder(reader).Decode(&u)
if err != nil {
return err
}
user.Name = u.FirstName + " " + u.LastName
user.NickName = u.FirstName
user.Email = u.Email
user.Description = u.Headline
user.AvatarURL = u.PictureURL
user.UserID = u.ID
user.Location = u.Location.Name
return 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{},
}
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
return c
}
//RefreshToken refresh token is not provided by linkedin
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
return nil, errors.New("Refresh token is not provided by linkedin")
}
//RefreshTokenAvailable refresh token is not provided by linkedin
func (p *Provider) RefreshTokenAvailable() bool {
return false
}
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