How to upload a png file to S3 Bucket? - amazon-s3

Question

Trying to upload a png file using S3-for-Google-Apps-Script library to S3 bucket:
// get the image blob
const imgBlob = UrlFetchApp.fetch('imageUrl').getBlob();
// init S3 instance
const s3 = S3.getInstance(awsAccessKeyId, awsSecretKey);
// upload the image to S3 bucket
s3.putObject(bucketName, 'test.png', imgBlob, { logRequests:true });
The file is uploading to S3 but not in a perfect way! It looks like this:
If I download the image and open getting the error:
"It may be damaged or use a file format that Preview doesn’t recognize."
So, how can I upload a .png file to amazon S3 bucket?
I can correctly upload the image when 'base64' is used to s3.putObject():
const base64 = Utilities.base64Encode(imgBlob.getBytes());
s3.putObject(bucketName, 'test.png', base64, { logRequests:true });
// go to S3 and clicking on the link I can see the base64 string
But this is uploading as String e.g. when I go S3 & click on test.png I see something like this: "iVBORw0KGgoAAAANSUhEUgAAAgAAAAI ... II=", but I want to see the actual image, not a String.

Answer 1

I believe your situation and goal as follows.
In your situation, the base64 data of the image can be uploaded. But, the uploaded data is not the image. It's the string data.
In your goal, you want to upload the image file of the publicly shared image using the image URL.
For this, how about this answer?
Issue and workaround:
When I saw the script of "S3-for-Google-Apps-Script", it seems that the URL cannot be directly used for s3.putObject(). And, the inputted blob is converted to the string type using getDataAsString(). I think that this is the reason of your issue.
In this answer, I would like to propose to modify the GAS library of "S3-for-Google-Apps-Script" for using the byte array to payload.
Usage:
At first, please copy the GAS project of S3-for-Google-Apps-Script, and please modify this as follows.
Modified script:
About S3.prototype.putObject in the file of S3.gs, please modify as follows.
From:
request.setContent(object.getDataAsString());
To:
request.setContent(object.getBytes());
And, about S3Request.prototype.setContent in the file of S3Request.gs, please modify as follows.
From:
if (typeof content != 'string') throw 'content must be passed as a string'
To:
// if (typeof content != 'string') throw 'content must be passed as a string'
And, about S3Request.prototype.getContentMd5_ in the file of S3Request.gs, please modify as follows.
From:
return Utilities.base64Encode(Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, this.content, Utilities.Charset.UTF_8));
To:
return Utilities.base64Encode(Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, this.content));
Sample script:
And, for above modified script, please test the following script.
const imageUrl = "###"; // Please set the image URL.
const s3 = S3.getInstance(awsAccessKeyId, awsSecretKey); // Please set them.
const imageBlob = UrlFetchApp.fetch(imageUrl).getBlob();
s3.putObject(bucketName, 'test.png', imageBlob, { logRequests:true });
By this, your token can be created by the modified library and use it.
When I checked this official document, I thought that the byte array might be able to be used.
References:
PutObject
S3-for-Google-Apps-Script