Refactor refreshAvatar()

object/user_avatar_gravatar.go

@@ -0,0 +1,76 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package object
+
+import (
+	"bytes"
+	"crypto/md5"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+)
+
+func hasGravatar(client *http.Client, email string) (bool, error) {
+	// Clean and lowercase the email
+	email = strings.TrimSpace(strings.ToLower(email))
+
+	// Generate MD5 hash of the email
+	hash := md5.New()
+	io.WriteString(hash, email)
+	hashedEmail := fmt.Sprintf("%x", hash.Sum(nil))
+
+	// Create Gravatar URL with d=404 parameter
+	gravatarURL := fmt.Sprintf("https://www.gravatar.com/avatar/%s?d=404", hashedEmail)
+
+	// Send a request to Gravatar
+	req, err := http.NewRequest("GET", gravatarURL, nil)
+	if err != nil {
+		return false, err
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	// Check if the user has a custom Gravatar image
+	if resp.StatusCode == http.StatusOK {
+		return true, nil
+	} else if resp.StatusCode == http.StatusNotFound {
+		return false, nil
+	} else {
+		return false, fmt.Errorf("failed to fetch gravatar image: %s", resp.Status)
+	}
+}
+
+func getGravatarFileBuffer(client *http.Client, email string) (*bytes.Buffer, string, error) {
+	// Clean and lowercase the email
+	email = strings.TrimSpace(strings.ToLower(email))
+
+	// Generate MD5 hash of the email
+	hash := md5.New()
+	_, err := io.WriteString(hash, email)
+	if err != nil {
+		return nil, "", err
+	}
+	hashedEmail := fmt.Sprintf("%x", hash.Sum(nil))
+
+	// Create Gravatar URL
+	gravatarUrl := fmt.Sprintf("https://www.gravatar.com/avatar/%s", hashedEmail)
+
+	return downloadImage(client, gravatarUrl)
+}