How do I pass multipart-form data to AWS Lambda

Question

I am trying to send a file from client side and receive it through AWS API Gateway to my Lambda function which will then put this file in S3 bucket.

I have used the following as default parameter template in API Gateway

{"image" : $input.params('MediaUrl0')}

How will I receive it in python which looks like: def read_upload_toS3(event, context): s3 = boto3.resource('s3')

birnbaum · Accepted Answer · 2016-04-29 13:50:34Z

5

You could use the lately introduced $input.body variable in your mapping template:

{ "body" : "$input.body" }

You maybe should also check out this discussion on this problem. To receive the body in your python function just do

def my_handler(event, context): body = event['body']

But if the sole purpose of the function is to upload the file to S3, you could also do this directly with API Gateway:

Go to the Integration Request settings of your method
Under Integration Type klick show advanced
Select AWS Service Proxy
Select S3 als the AWS Service and fill in the necessary information

edited Apr 29, 2016 at 13:50

answered Apr 29, 2016 at 8:17

birnbaum

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6 Comments

Jayanth Thyagarajan Over a year ago

I would like to know how to receive this in the Python.

Jayanth Thyagarajan Over a year ago

I got this error. Can you please help me with this.. {"message": "Could not parse request body into json: Unexpected character (\'-\' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value\n at [Source: [B@98c32b3; line: 1, column: 3]"}

ALex_hha Over a year ago

I have the same error. It seems api gateway still can't properly handle multipart-form data

Rush Over a year ago

Try { "body" : "$util.base64Encode($input.body)" } if you're getting an error.

christian Over a year ago

"Could not parse request body into json: Unexpected character..." can be solved by adding a "multipart/form-data" body template in the "Integration Request" section of your POST resource. (A spanish/speaking video made by me: youtu.be/79ckseUxvLw)

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