I programmed a script to export my received emails from Gmail to PDF. Everything works fine except I cannot extract the inline images which have been sent to me using a Gmail account. The problem is, that there is no link between the inline image attachement (they all get the same name if inserted per copy and paste e.g. graphic.png) and the cid (e.g. ii_l5vcyjv50) in the html code.
There seem to be hundreds of workaround solutions on the internet to extract the image's base64 code from message.getRawContent() and replace the corresponding cid in the html with it. But all do not work anymore because either the structure of getRawContent() has changed and the used RegEx do not work or Google changed how inline images are linked (format of cid).
Is it really that difficult to get access to the inline images? How could I extract the X-Attachment-Ids and the belonging base64 codes into an array? Unfortunately there are no tags used in front of the base64 code and the RegEx abolutely overwhelms me.
Thank you very much!
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Dies ist ein Screenshot:
[image: grafik.png]
Dies ist eine per Drag und Drop eingef=C3=BCgte Bilddatei:
[image: amsel.jpg]
Dies ist ein Bild aus Word:
[image: grafik.png]
Dies ist ein Bild direkt aus dem Browser =C3=BCber "Grafik kopieren"
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--0000000000008333b505e48ad3d1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">---------- Forwarded message ---------<br>Von: <b class=3D"=
gmail_sendername" dir=3D"auto">Summer Moon</b> <span dir=3D"auto"><<a hr=
ef=3D"mailto:[email protected]">[email protected]</a>></span=
><br>Date: Do., 21. Juli 2022 um 20:24=C2=A0Uhr<br>Subject: Gmail Inline Im=
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[email protected]</a>><br></div><br><br><div dir=3D"ltr"><div>Dies ist =
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width=3D"468" height=3D"263"><br><br></div><div>Dies ist eine per Drag und =
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gmail_signature"><div dir=3D"ltr">Viele Gr=C3=BC=C3=9Fe=C2=A0<div>Benni</di=
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--0000000000008333b505e48ad3d1--
--0000000000008333b605e48ad3d2
Content-Type: image/png; name="grafik.png"
Content-Disposition: inline; filename="grafik.png"
Content-Transfer-Encoding: base64
Content-ID: <ii_l5vcyjv50>
X-Attachment-Id: ii_l5vcyjv50
iVBORw0KGgoAAAANSUhEUgAAB4AAAAOPCAYAAAAqu9wAAAAABHNCSVQICAgIfAhkiAAAIABJREFU
eF7svdmXJOd53vnmXllbV29oNIAGAZAUaZImJYqmRGksjzSWfSEf6VbnzPHV3M7dXMyl WdoLnx0
xvacIx/bc6GjsWXNcEYSTJEUKYIUuADEjsbS6LX23DPmeSMruqOiMjIyKzMrt182ClUZ8S3v9/u
iKzKJ5/3ywVBJwiCnPlXNzB9t9ijq5/z8QP8DAEIQAACEIBAjEAul4bj1AtqWqGpHc nBza1Pgc1
fDac2fIZFCvnIJBFQL82j/nw37HTH7lgvN /AxscoH7zT 88PDO4vv5iGFg/yI07vjH7T0zQ2fvP
wPAzT57 e lJ8WH78b 5Bj3yGcNPqx7FdSqO3NnSfQ6Fcx7Vj YvlxhQtG6y1ld8bP37elLiXNdS
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CodePudding user response：
With the Gmail API you can retrieve the cid and base64 as follows:
gmail.users.messages.get({
userId: "me",
id: <MessageID>,
fields: "payload.parts"
}).then(function({data}) {
for (var part of data.payload.parts) {
var cid = part.headers.find(_ => _.name.toLowerCase === "content-id").value;
var base64 = part.body.data;
}
});
CodePudding user response：
I believe your goal is as follows.
- You want to retrieve the image data of the inline image file from a Gmail message.
- You want to achieve this using Google Apps Script.
In this case, how about the following sample script?
Sample script:
This script uses Gmail API. So, please enable Gmail API at Advanced Google services. And, please set the message ID of the email including the inline images.
function myFunction() {
var messageId = "###"; // Please set the message ID of mail you want to retrieve.
var obj = Gmail.Users.Messages.get("me", messageId);
var files = obj.payload.parts.reduce((ar, { body, headers, mimeType }) => {
var ob = headers.find(({ name }) => name == "X-Attachment-Id");
if (ob) {
var { data } = Gmail.Users.Messages.Attachments.get("me", messageId, body.attachmentId);
var blob = Utilities.newBlob(data, mimeType, ob.value);
ar.push({ cid: ob.value, blob });
}
return ar;
}, []);
// If you want to create the files as each file, you can use the following script.
files.forEach(({ blob }) => DriveApp.createFile(blob)); // By this, the files with the filename of "cid" are created to the root folder.
}
- When This script is run, first, the attachment IDs are retrieved from the email including the inline images using
Gmail.Users.Messages.get. And, using the attachment IDs, the image data is retrieved usingGmail.Users.Messages.Attachments.get. In the case of Gmail API of Advanced Google services, the data is returned as the byte array. And, the value offileshas an array including the cid value and the image blob.