sendmail中inlineImages的Google Script CacheService缓存图像 [英] Google Script CacheService cache image for inlineImages in sendMail

问题描述

我想将图像存储在Google Script的Cacheservice中，然后再将该图像作为内嵌图像插入HTML邮件中.

I would like to store an image in Google Script's Cacheservice and then get this image later inserted as an inline image in a HTML mail.

我已经尝试使它起作用，但是到目前为止没有成功. Logger中以下代码的错误是无效参数:附件".如果我检查它在sendMail()中显示的var图标是一个斑点:

I have tried to make it work, but no success so far. Error of code below in Logger is 'Invalid argument: attachments'. If I check it shows var icon in sendMail() is a blob:

function onOpen(e){
  var icon = DriveApp.getFileById('ID').getBlob().setName('icon');
  var cache = CacheService.getDocumentCache().put('icon', icon);
  }

function sendMail() {

  var icon = CacheService.getDocumentCache().get('icon');

  var email = '[e-mail]';
  var subject = 'test';
  var txt = 'test';
  var html = '<img src="cid:icon"/>';

   MailApp.sendEmail(email, subject, txt, {htmlBody: html, name : 'test', inlineImages:{icon:icon}});

}

令人惊讶的是，我这样做了

Surprisingly if I do this:

 function sendMail() {

      var icon = DriveApp.getFileById('ID').getBlob().setName('icon');

      var email = '[e-mail]';
      var subject = 'test';
      var txt = 'test';
      var html = '<img src="cid:icon"/>';

       MailApp.sendEmail(email, subject, txt, {htmlBody: html, name : 'test', inlineImages:{icon:icon}});

    }

它工作正常.我的代码有什么问题?

it works fine. What is the issue with my code?

推荐答案

Google 缓存服务仅接受 string 值，而您试图将blob推入显然是不同类型的值.一旦将其转换为正确的字符串，就可以了.

Google Cache Service accepts only string values, while you are trying to push a blob into it which is apparently different type. Once you turn it to a proper string - it will be fine.

为了确保我们正确保存它，我们应该使用base64encode.

To ensure that we save it correctly we should use base64encode.

尝试替换

var cache = CacheService.getDocumentCache().put('icon', icon);

与

var cache = CacheService.getDocumentCache()
cache.put('icon', Utilities.base64Encode(icon.getBytes()));

分别，当您获取缓存值时，您将需要从我们的字符串中创建一个新的blob对象.

And respectively, when you are getting cached value back you will need to create a new blob object from our string.

首先，我们创建一个空的blob并读取缓存的值:

First we create empty blob and read cached value:

var iconBlob = Utilities.newBlob("")
var cachedValue = cache.get('icon');

然后您可以像这样使用它:

And then you can use it like:

iconBlob.setBytes(Utilities.base64Decode(cachedValue ))
iconBlob.setName('yourname')
iconBlob.setContentType('image/png')

您可以在参考中检查这两种方法. 如果将对象字符串化，也可以用相同的方法将对象保存在缓存服务中.

You can check both methods in reference. You can also save Objects in Cache Service the same way if you Stringify them.

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