I am sending some form-data in request body from postman. In aws API Gateway I have set Content-type as "multipart/form-data" and mapping template is following:
#set($allParams = $input.params())
{
"body-json" : $input.json('$'),
"params" : {
#foreach($type in $allParams.keySet())
#set($params = $allParams.get($type))
"$type" : {
#foreach($paramName in $params.keySet())
"$paramName" : "$util.escapeJavaScript($params.get($paramName))"
#if($foreach.hasNext),#end
#end
}
#if($foreach.hasNext),#end
#end
},
"stage-variables" : {
#foreach($key in $stageVariables.keySet())
"$key" : "$util.escapeJavaScript($stageVariables.get($key))"
#if($foreach.hasNext),#end
#end
},
"context" : {
"account-id" : "$context.identity.accountId",
"api-id" : "$context.apiId",
"api-key" : "$context.identity.apiKey",
"authorizer-principal-id" : "$context.authorizer.principalId",
"caller" : "$context.identity.caller",
"cognito-authentication-provider" : "$context.identity.cognitoAuthenticationProvider",
"cognito-authentication-type" : "$context.identity.cognitoAuthenticationType",
"cognito-identity-id" : "$context.identity.cognitoIdentityId",
"cognito-identity-pool-id" : "$context.identity.cognitoIdentityPoolId",
"http-method" : "$context.httpMethod",
"stage" : "$context.stage",
"source-ip" : "$context.identity.sourceIp",
"user" : "$context.identity.user",
"user-agent" : "$context.identity.userAgent",
"user-arn" : "$context.identity.userArn",
"request-id" : "$context.requestId",
"resource-id" : "$context.resourceId",
"resource-path" : "$context.resourcePath"
}
}
However when I am getting the request on my lambda function everything is properly mapped into JSON, except my request body. Request body is coming as String. Following is the complete request:
{
"context": {
"authorizer-principal-id": "",
"cognito-authentication-type": "",
"cognito-identity-id": "",
"resource-path": "/env/Response",
"account-id": "",
"cognito-identity-pool-id": "",
"request-id": "cd2052-11e7-92b6-e3c7d7dgh01",
"api-id": "39dhjsr8",
"resource-id": "skdsk5",
"user-arn": "",
"caller": "",
"http-method": "POST",
"cognito-authentication-provider": "",
"api-key": "",
"user": "",
},
"body-json": "------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"sig\"\r\n\r\nmcHeelgDQcYnjh5L2L92H8KLLE=\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"resultdescription\"\r\n\r\ncancelled.\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"result\"\r\n\r\nF\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"errorcode\"\r\n\r\n101\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"id\"\r\n\r\n420LU2UEG\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"key\"\r\n\r\ntdx\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"refid\"\r\n\r\n10480\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"name\"\r\n\r\nTest\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"date\"\r\n\r\n2016-02-28T20:05:05.6330000Z\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx\r\nContent-Disposition: form-data; name=\"timestamp\"\r\n\r\n2016-02-29T04:15:47.4797Z\r\n------WebKitFormBoundaryLAn6jCAA10bF7ZMx--",
"params": {
"path": {},
"querystring": {},
"header": {
},
"stage-variables": {}
}
I have 2 queries regarding this:
Any help will be highly appreciated, as I am new to AWS.
It would be best if you send your payload as application/json
. That way, you can have it parsed in the mapping template using $util.parseJson()
and the request body will come out as an object.
If you want to stick with form-data, you'll have to convert it inside your handler.
In Node.js, I use querystring
module for this. Not sure what you can use in Java.
You can use $util.parseJson() in body mapping template. It takes "stringified" JSON and returns an object representation of the result. You can use the result from this function to access and manipulate elements of the payload
Please read the documentation here
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