如何调试撰写草稿消息

Question

我正在尝试创建一个适用于 Gmail 的 Google Workspace 插件，用于读取电子邮件并撰写草稿。

我正在关注文档https://developers.google.com/workspace/add-ons/gmail/compose，我只是复制/粘贴示例中的代码，这里是我的代码：

appsscript.json

{
  "timeZone": "Etc/GMT",
  "oauthScopes": [
    "https://www.googleapis.com/auth/gmail.addons.execute",
    "https://www.googleapis.com/auth/gmail.addons.current.action.compose",
    "https://www.googleapis.com/auth/gmail.addons.current.message.metadata",
    "https://www.googleapis.com/auth/gmail.metadata",
    "https://www.googleapis.com/auth/gmail.modify"
  ],
  "gmail": {
    "name": "Test!",
    "logoUrl": "https://www.gstatic.com/images/icons/material/system/1x/receipt_black_24dp.png",
    "contextualTriggers": [
      {
        "unconditional": {},
        "onTriggerFunction": "getContextualAddOn"
      }
    ],
    "composeTrigger": {
      "selectActions": [
        {
          "text": "Generate answer",
          "runFunction": "createReplyDraft"
        }
      ],
      "draftAccess": "METADATA"
    },
    "primaryColor": "#41f470",
    "secondaryColor": "#94f441"
  },
  "dependencies": {
    "enabledAdvancedServices": [
      {
        "userSymbol": "Gmail",
        "version": "v1",
        "serviceId": "gmail"
      }
    ]
  }
}

代码：

/**
   *  Creates a draft email (with an attachment and inline image)
   *  as a reply to an existing message.
   *  @param {Object} e An event object passed by the action.
   *  @return {ComposeActionResponse}
   */
  function createReplyDraft(e) {
    // Activate temporary Gmail scopes, in this case to allow
    // a reply to be drafted.
    var accessToken = e.gmail.accessToken;
    GmailApp.setCurrentMessageAccessToken(accessToken);

    // Creates a draft reply.
    var messageId = e.gmail.messageId;
    var message = GmailApp.getMessageById(messageId);
    var draft = message.createDraftReply('ciao');

    // Return a built draft response. This causes Gmail to present a
    // compose window to the user, pre-filled with the content specified
    // above.
    return CardService.newComposeActionResponseBuilder()
        .setGmailDraft(draft).build();
  }

问题是我收到此错误：参数无效

这发生在这一行：

var message = GmailApp.getMessageById(messageId);

我感觉messageId为null，但不知道如何调试。无论如何，由于我只是从文档中复制了示例，所以我不知道如何解决这个问题，你知道我做错了什么吗？

Answer 1

要了解调试 Google Apps 脚本代码，请阅读 https://developers.google.com/apps-script/guides/support/troubleshooting。在那里，您将学习调试、日志记录、执行日志和调试器的基础知识。

有问题的代码不仅仅是代码的“副本”https://developers.google.com/workspace/add-ons/gmail/compose，因为它遗漏了一些部分并更改了其他部分。更具体地说，它与书面说明不一致。更具体地说，清单包含用于调用

createReplyDraft

的 composeTrigger，但此函数应由 Google Apps 脚本操作调用。当编辑现有草稿以按预期创建新草稿时，可能会使用它。参考文章中的代码包含以下内容，但不包含在问题正文中：

var composeAction = CardService.newAction()
    .setFunctionName('createReplyDraft');
var composeButton = CardService.newTextButton()
    .setText('Compose Reply')
    .setComposeAction(
        composeAction,
        CardService.ComposedEmailType.REPLY_AS_DRAFT);