oauth2_proxy/providers/facebook.go

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package providers
import (
"errors"
"fmt"
"net/http"
"net/url"
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"github.com/pusher/oauth2_proxy/api"
)
type FacebookProvider struct {
*ProviderData
}
func NewFacebookProvider(p *ProviderData) *FacebookProvider {
p.ProviderName = "Facebook"
if p.LoginURL.String() == "" {
p.LoginURL = &url.URL{Scheme: "https",
Host: "www.facebook.com",
Path: "/v2.5/dialog/oauth",
// ?granted_scopes=true
}
}
if p.RedeemURL.String() == "" {
p.RedeemURL = &url.URL{Scheme: "https",
Host: "graph.facebook.com",
Path: "/v2.5/oauth/access_token",
}
}
if p.ProfileURL.String() == "" {
p.ProfileURL = &url.URL{Scheme: "https",
Host: "graph.facebook.com",
Path: "/v2.5/me",
}
}
if p.ValidateURL.String() == "" {
p.ValidateURL = p.ProfileURL
}
if p.Scope == "" {
p.Scope = "public_profile email"
}
return &FacebookProvider{ProviderData: p}
}
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func getFacebookHeader(accessToken string) http.Header {
header := make(http.Header)
header.Set("Accept", "application/json")
header.Set("x-li-format", "json")
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header.Set("Authorization", fmt.Sprintf("Bearer %s", accessToken))
return header
}
func (p *FacebookProvider) GetEmailAddress(s *SessionState) (string, error) {
if s.AccessToken == "" {
return "", errors.New("missing access token")
}
req, err := http.NewRequest("GET", p.ProfileURL.String()+"?fields=name,email", nil)
if err != nil {
return "", err
}
req.Header = getFacebookHeader(s.AccessToken)
type result struct {
Email string
}
var r result
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err = api.RequestJSON(req, &r)
if err != nil {
return "", err
}
if r.Email == "" {
return "", errors.New("no email")
}
return r.Email, nil
}
func (p *FacebookProvider) ValidateSessionState(s *SessionState) bool {
return validateToken(p, s.AccessToken, getFacebookHeader(s.AccessToken))
}