利用谷歌的 GAS 转发 gmail 邮件到 tg

gsp，google apps script，类似于云函数
优点是：gsp 集成 gmail 不经第三方，可以按分类过滤垃圾、推广邮件
免费版一天最多 20000 次请求，大概 4-5s 拉一次邮件刚好够用

/*
Author: 風信子 t.me/TeleDele, umzr: github.com/umzr
/*
set Webhook
https://api.telegram.org/bot/setWebhook?url=<>
*/
var clientID = "-100215133123"
var TelegramBotToken = "4234421:..";
var TelegramBotAPI = "https://api.telegram.org/bot" + TelegramBotToken + "/";

function continuousCheck() {
    var runDuration = 60000;  
    var startTime = new Date().getTime();
    var i = 0;

    while (new Date().getTime() - startTime < runDuration) {searchUnreadEmail();
        i++;
        Utilities.sleep(5000);
        Logger.log("--->" + i);
    }
}

function searchUnreadEmail() {var threads = GmailApp.search('is:unread category:primary -category:social -category:promotions newer_than:7d');// 过滤条件
        for (var i = threads.length - 1; i>= 0; i--) {var messages = threads[i].getMessages(); 
            for (var j = 0; j < messages.length; j++) {var message = messages[j];
                if (message.isUnread()) {var sender = message.getFrom().replace(/<|>/g, '');
                    var recipient = message.getTo().replace(/.*<(.+)>/, '$1').trim();
                    var subject = message.getSubject();
                    var date = message.getDate();
                    var plainBody = message.getPlainBody();
                    var formattedDate = Utilities.formatDate(date, Session.getScriptTimeZone(), 'yyyy-MM-dd HH:mm:ss');

                    // 移除软连字符和其他特殊字符
                    plainBody = plainBody.replace(/[u200B-u200DuFEFFu00ADs]+/g, ' ').trim();
                    // 删除多余的空白
                    plainBody = plainBody.replace(/(s{22,})/g, '');
                    // plainBody = plainBody.replace(/<([^>]+)>/g, ' 链接 ');
                    console.log("plainBody:" + plainBody);
                    plainBody = plainBody.replace(/?/g, function(match, p1) {var url = p1.replace(/[<>]/g, ''); // 去掉尖括号
                      var domain = url.split('/')[2]; // 提取域名部分
                      return '' + domain + '...';
                  });

                    console.log("plainBody:" + plainBody);
                    // 截取纯文本的前 800 个字符
                    if (plainBody.length> 800) {plainBody = plainBody.substring(0, 800);

                        // 判断是否在 a 标签内
                        var lastOpeningTag = plainBody.lastIndexOf('');

                        // 如果最后一个 ' lastClosingTag) {
                            // 查找完整的闭合标签
                            var closingTagEnd = plainBody.indexOf('>', lastOpeningTag);

                            // 如果闭合标签存在，截取到标签结束的位置
                            if (closingTagEnd !== -1) {plainBody = plainBody.substring(0, closingTagEnd + 1);
                            } else {
                                // 否则直接删除未完整的标签部分
                                plainBody = plainBody.substring(0, lastOpeningTag);
                            }
                        }
                    }
                    var telegramMessage = "" + subject + "n"  + formattedDate + "nFrom：" + sender +
                                         "nn" + plainBody + "nn" + recipient + 
                                         'Link';
                    console.log("TG:" + telegramMessage);
                    // 发送到 Telegram
                    pushTelegramBotMessage(telegramMessage, message.getId());
                    // 标记消息为已读
                    message.markRead();}
            }
        }
}

// Function to push message to Telegram Bot
function pushTelegramBotMessage(message, messageId) {
    var payload = {
        "method": "sendMessage",
        "chat_id": clientID,
        "text": message,
        "parse_mode": "HTML"
    };
    var options = {
        "method": "post",
        "contentType": "application/json",
        "payload": JSON.stringify(payload)
    };
    UrlFetchApp.fetch(TelegramBotAPI + "sendMessage", options);
}```
以上做了些修改，复制过去设置自己的参数 chatid，token，设置个触发器就能用