api-gateway-payload-parse
v0.1.0
Published
Utility function for easier parsing of the AWS API-Gateway built-in mapping template functions, like `input.params()`.
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api-gateway-payload-parse
Utility function for easier parsing of the AWS API-Gateway built-in mapping template functions, like input.params()
.
Overview
By default, a mapping template like:
{
"all-params" : "$input.params()",
"path-params" : "$input.params().path",
"query-params" : "$input.params().querystring",
"header-params" : "$input.params().header",
"header-param-names" : "$input.params().header.keySet()",
"content-type-value" : "$input.params().header.get('Content-Type')"
}
Will actually send it wrapped from Velocity like:
{
"all-params": "{path={path=users}, querystring={fields=id, anotherKey=aParam%2CanotherParam}, header={}}",
"path-params" : "{path=users}",
"query-params" : "{fields=id, anotherKey=aParam%2CanotherParam}",
"header-params" : "{}",
"header-param-names" : "[]",
"content-type-value" : ""
}
Instead of making complex mapping templates, this module remaps:
"{fields=id, anotherKey=aParam%2CanotherParam}"
to a javascript object:
{
fields: "id"
anotherKey: "aParam,anotherParam"
}
Install
$ npm install --save api-gateway-payload-parse
Usage
Create an integration request mapping template utilizing mapping variables provided by API Gateway. Or use the example above in overview
A full list is available here: http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-mapping-template-reference.html
// assuming a mapping template of:
// { "query-params": "$input.params().querystring" }
// which would make a application/json payload of:
// {"query-params": "{fields=id, anotherKey=aParam%2CanotherParam}"}
var payloadParse = require('api-gateway-payload-parse');
exports.handler = function(event, context) {
var query_string = payloadParse(event['query-params']);
context.done(query_string);
};