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 } var commenterHex string // TODO: in case of returning users, update the information we have on record? if err == errorNoSuchCommenter { var link string if val, ok := user["link"]; ok { link = val.(string) } else { link = "undefined" } commenterHex, err = commenterNew(email, user["name"].(string), link, user["picture"].(string), "google", "") if err != nil { fmt.Fprintf(w, "Error: %s", err.Error()) return } } else { commenterHex = c.CommenterHex } if err := commenterSessionUpdate(commenterToken, commenterHex); err != nil { fmt.Fprintf(w, "Error: %s", err.Error()) return } fmt.Fprintf(w, "") }