package main import ( "encoding/json" "fmt" "golang.org/x/oauth2" "io/ioutil" "net/http" ) func googleCallbackHandler(w http.ResponseWriter, r *http.Request) { commenterToken := r.FormValue("state") code := r.FormValue("code") _, err := commenterGetByCommenterToken(commenterToken) if err != nil && err != errorNoSuchToken { fmt.Fprintf(w, "Error: %s\n", err.Error()) return } token, err := googleConfig.Exchange(oauth2.NoContext, code) if err != nil { fmt.Fprintf(w, "Error: %s", err.Error()) return } resp, err := http.Get("https://www.googleapis.com/oauth2/v2/userinfo?access_token=" + token.AccessToken) defer resp.Body.Close() contents, err := ioutil.ReadAll(resp.Body) if err != nil { fmt.Fprintf(w, "Error: %s", errorCannotReadResponse.Error()) return } user := make(map[string]interface{}) if err := json.Unmarshal(contents, &user); err != nil { fmt.Fprintf(w, "Error: %s", errorInternal.Error()) return } if user["email"] == nil { fmt.Fprintf(w, "Error: no email address returned by Github") return } email := user["email"].(string) c, err := commenterGetByEmail("google", email) if err != nil && err != errorNoSuchCommenter { fmt.Fprintf(w, "Error: %s", err.Error()) return } name := user["name"].(string) link := "undefined" if user["link"] != nil { link = user["link"].(string) } photo := "undefined" if user["picture"] != nil { photo = user["picture"].(string) } var commenterHex string if err == errorNoSuchCommenter { commenterHex, err = commenterNew(email, name, link, photo, "google", "") if err != nil { fmt.Fprintf(w, "Error: %s", err.Error()) return } } else { if err = commenterUpdate(c.CommenterHex, email, name, link, photo, "google"); err != nil { logger.Warningf("cannot update commenter: %s", err) // not a serious enough to exit with an error } commenterHex = c.CommenterHex } if err := commenterSessionUpdate(commenterToken, commenterHex); err != nil { fmt.Fprintf(w, "Error: %s", err.Error()) return } fmt.Fprintf(w, "") }