Function handleUsernameCheck

unregisteredusers.go:74–117

{ "username": "asdf" } result: { code: 204 }

(app *App, w http.ResponseWriter, r *http.Request)

// { "username": "asdf" }
// result: { code: 204 }
func handleUsernameCheck(app *App, w http.ResponseWriter, r *http.Request) error {
	reqJSON := IsJSON(r)

	// Get params
	var d struct {
		Username string `json:"username"`
	}
	if reqJSON {
		decoder := json.NewDecoder(r.Body)
		err := decoder.Decode(&d)
		if err != nil {
			log.Error("Couldn't decode username check: %v\n", err)
			return ErrBadFormData
		}
	} else {
		return impart.HTTPError{http.StatusNotAcceptable, "Must be JSON request"}
	}

	// Check if username is okay
	finalUsername := getSlug(d.Username, "")
	if finalUsername == "" {
		errMsg := "Invalid username"
		if d.Username != "" {
			// Username was provided, but didn't convert into valid latin characters
			errMsg += " - must have at least 2 letters or numbers"
		}
		return impart.HTTPError{http.StatusBadRequest, errMsg + "."}
	}
	if app.db.PostIDExists(finalUsername) {
		return impart.HTTPError{http.StatusConflict, "Username is already taken."}
	}
	var un string
	err := app.db.QueryRow("SELECT username FROM users WHERE username = ?", finalUsername).Scan(&un)
	switch {
	case err == sql.ErrNoRows:
		return impart.WriteSuccess(w, finalUsername, http.StatusOK)
	case err != nil:
		log.Error("Couldn't SELECT username: %v", err)
		return impart.HTTPError{http.StatusInternalServerError, "We messed up."}
	}

	// Username was found, so it's taken
	return impart.HTTPError{http.StatusConflict, "Username is already taken."}
}

func getValidUsername(app *App, reqName, prevName string) (string, *impart.HTTPError) {
	// Check if username is okay