Work with inline images
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When you retrieve a draft in Gmail, the inline images files can be found among the attachments but there's no link between those attachments and the email body.
If you want to create a new email based on an old one (like in a mail merge), this add some difficulties.
The issue
For example, here's an email body retrieved with .getBody()
<div dir="ltr"><div><img src="?view=att&th=1401f70d4881e07f&attid=0.3&disp=emb&realattid=ii_1401f6fc7824ebe1&zw&atsh=1" alt="Inline image 4" width="200" height="180"><br></div><div><br></div><img src="?view=att&th=1401f70d4881e07f&attid=0.2&disp=emb&realattid=ii_1401f6e6c1d46c4b&zw&atsh=1" alt="Inline image 2" width="200" height="65"><div><br></div><div>
jtykuykyu</div><div><br></div><div><img src="?view=att&th=1401f70d4881e07f&attid=0.1&disp=emb&realattid=ii_1401f6e9df3a4b1c&zw&atsh=1" alt="Inline image 3" width="200" height="82"><br><div><br></div><div><br></div></div></div>
And here is the list of attachments for the email (among which are our inline images):
[13-07-30 08:28:08:378 CEST] Screen Shot 2013-07-12 at 1.54.31 PM.png
[13-07-30 08:28:08:379 CEST] Screen Shot 2013-07-23 at 5.38.51 PM.png
[13-07-30 08:28:08:380 CEST] Screen Shot 2013-07-25 at 9.05.15 AM.png
[13-07-30 08:28:08:381 CEST] test2.png
As you can see, there's no link between the name of those images and the information available in the img tags, so there's no safe way to rebuild a correct email with only those information.
The solution
How to solve that ? We can use the method .getRawContent() to get the actual email and parse it to get the information we need. Specifically, this method give us a relationship between the name of an attachment and the 'realattid' available in the email body:
Content-Type: image/png; name="Screen Shot 2013-07-25 at 9.05.15 AM.png"
Content-Transfer-Encoding: base64
Content-ID: <ii_1401f6e9df3a4b1c>
X-Attachment-Id: ii_1401f6e9df3a4b1c
Code snippet
Here's a code snippet to:
Retrieve the body & attachments of an email
Get all the img tags inside the body and see which ones are linked to attachments in the email
Get the 'realattid' of each image and use .getRawContent() to link this 'realattid' to the right attachment
Replace the img tag to correctly link it to the right attachment
Indicate that this attachment is no longer a simple attachment but an inline image
Once all that is done you have all the data you need to send a copy of this email with the correct inline images displayed.
//////////////////////////////////////////////////////////////////////////////
// Get inline images and make sure they stay as inline images
//////////////////////////////////////////////////////////////////////////////
var emailTemplate = selectedTemplate.getBody();
var rawContent = selectedTemplate.getRawContent();
var attachments = selectedTemplate.getAttachments();
var regMessageId = new RegExp(selectedTemplate.getId(), "g");
if (emailTemplate.match(regMessageId) != null) {
var inlineImages = {};
var nbrOfImg = emailTemplate.match(regMessageId).length;
var imgVars = emailTemplate.match(/<img[^>]+>/g);
var imgToReplace = [];
if(imgVars != null){
for (var i = 0; i < imgVars.length; i++) {
if (imgVars[i].search(regMessageId) != -1) {
var id = imgVars[i].match(/realattid=([^&]+)&/);
if (id != null) {
var temp = rawContent.split(id[1])[1];
temp = temp.substr(temp.lastIndexOf('Content-Type'));
var imgTitle = temp.match(/name="([^"]+)"/);
if (imgTitle != null) imgToReplace.push([imgTitle[1], imgVars[i], id[1]]);
}
}
}
}
for (var i = 0; i < imgToReplace.length; i++) {
for (var j = 0; j < attachments.length; j++) {
if(attachments[j].getName() == imgToReplace[i][0]) {
inlineImages[imgToReplace[i][2]] = attachments[j].copyBlob();
attachments.splice(j, 1);
var newImg = imgToReplace[i][1].replace(/src="[^\"]+\"/, "src=\"cid:" + imgToReplace[i][2] + "\"");
emailTemplate = emailTemplate.replace(imgToReplace[i][1], newImg);
}
}
}
}
//////////////////////////////////////////////////////////////////////////////
var message = {
htmlBody: emailTemplate,
subject: selectedTemplate.getSubject(),
attachments: attachments,
inlineImages: inlineImages
}