Send SVG image content to email as HTML using boto3

2022-05-06 19:19 kor imported from Stackoverflow

I want to send SVG content (without saved file) as HTML to Outlook email address. This SVG content works fine in browser showing a circle image, however sending it via boto3.client to Outlook email results in empty mail. Why? Any suggestions appreciated.

import io
import json
import boto3
from botocore.exceptions import ClientError

SENDER = "Name1 LastName1 <Name1.LastName1@mail.com>"
RECIPIENT = "Name2 LastName2 <Name2.LastName2@mail.com>"
AWS_REGION = "us-east-1"
SUBJECT = "something"

svg = """
<svg width="100" height="100">
<circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" />
</svg> 
"""

BODY_HTML = f"""<html>
<body>
{svg}
</body>
</html>
            """ 

CHARSET = "UTF-8"

client = boto3.client('ses',region_name=AWS_REGION)

try:
    response = client.send_email(
        Destination={
            'ToAddresses': [
                RECIPIENT
            ],
        },
        Message={
            'Body': {
                'Html': {
                    'Charset': CHARSET,
                    'Data': BODY_HTML
                }
            },
            'Subject': {
                'Charset': CHARSET,
                'Data': SUBJECT
            },
        },
        Source=SENDER
    )   
except ClientError as e:
    print(e.response['Error']['Message'])
else:
    print("Email sent! Message ID:"),
    print(response['MessageId'])

1 answer

answered 2022-05-07 19:32 Eugene Astafiev
SVG graphics are widely supported in web browsers but not all email programs know what to do with these new images. In case of Outlook you need to export the file to any image file format like PNG or JPEG and then attach it to the mail item. Then in the message body you can refer to use using a special syntax with a cid: prefix. Also you need to set the PR_ATTACH_CONTENT_ID MAPI property (DASL name "http://schemas.microsoft.com/mapi/proptag/0x3712001F") using the Attachment.PropertyAccessor.SetProperty method and refer that attachment through the src attribute that matches the value of PR_ATTACH_CONTENT_ID set on the attachment. PR_ATTACH_CONTENT_ID corresponds to the Content-ID MIME header when the message is sent.
```
attachment = MailItem.Attachments.Add("c:\temp\MyPicture.jpg")
attachment.PropertyAccessor.SetProperty("http://schemas.microsoft.com/mapi/proptag/0x3712001F", "YourImageId")
MailItem.HTMLBody = "<html><body>Test image <img src=""cid:YourImageId""></body></html>"
```

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To retrieve the picture I use presigned_urls:

s3client = boto3.client('s3', config=Config(signature_version='s3v4', region_name='eu-west-2'))
s3client.generate_presigned_url('get_object',Params={'Bucket': BUCKET,'Key': file_name_retrieved_from_db_for_user},ExpiresIn=120)

In Flutter I have a Future which calls the API and gets the image's generated presigned url (i.e. https://xx.s3.amazonaws.com/FILENAME.jpg?signature).

And then using a FutureBuilder I do the following:

FutureBuilder(
                                    future: get_picture_url(user_id),
                                    builder: (context, snapshot) {
                                      if (snapshot.connectionState == ConnectionState.done) {
                                        if (snapshot.data==0) {
                                          return Icon(Icons.account_circle, size: 110.0);
                                        }
                                        print(user_id);
                                        print('this is the data fetched');
                                        print(snapshot.data);
                                        return CachedNetworkImage(
                                          imageUrl: snapshot.data,
                                          imageBuilder: (context, imageProvider) => Container(
                                            width: 180.0,
                                            height: 180.0,
                                            decoration: BoxDecoration(
                                              shape: BoxShape.circle,
                                              image: DecorationImage(
                                                image: imageProvider, fit: BoxFit.cover),
                                              ),
                                          ),
                                          placeholder: (context, url) => ProfPicPlaceHolder(),
                                          errorWidget: (context, url, error) => Icon(Icons.error),
                                      );
                                      } else {
                                        return ProfPicPlaceHolder();
                                      }
                                    }
                                    ),

The problem is that each time the FutureBuilder calls the API to get the image's url, the URL is different due to different signature following the filename in the url, so the same image is loaded and cached again and again.

How can I access an image that is stored in S3 in flask using boto3 and then pass that url to cached network image in flutter? Is there any other way to cache an image in flutter from aws S3?

How to download files from S3 to a custom folder or a network path using boto3

Below is the function to download the files from a S3 Bucket. But the problem is I can't find how to direct those files into a network path instead of downloading into the project folder without having any control over where the files must be downloaded.

import boto3
import config
import os
import win32api

def download_all_objects_in_folder():
 #= boto3.resource('s3')
s3_resource = boto3.resource('s3', aws_access_key_id=config.AWS_BUCKET_KEY, aws_secret_access_key=config.AWS_BUCKET_SECRET_KEY) 
my_bucket = s3_resource.Bucket(config.BUCKET)
# Create the folder logic here
objects = my_bucket.objects.filter(Prefix='Export_20181104/')
for obj in objects:
    path, filename = os.path.split(obj.key)
    my_bucket.download_file(obj.key, filename,"C:\Other")
    #win32api.MessageBox(0, obj.key, 'title')

print("imports completed")

Update: This is the error I am getting when I pass the custom path.

ValueError: Invalid extra_args key 'C', must be one of: ChecksumMode, 
VersionId, SSECustomerAlgorithm, SSECustomerKey, SSECustomerKeyMD5, 
RequestPayer, ExpectedBucketOwner

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