WSO2 inline prototyping: How to get variables different that "path type"?

Question

I'm using the WSO2 2.1.0 inline prototyping feature, as shown in Create a Prototyped API with an Inline Script

This sample use the Synapse ScriptMessageContext to get the variables. But I'm only able to get the variable value if this is a "path" variable.

How can I get the other types (query, body) variables?

NOTE: My code is the same that example, but I have defined the variable in the API as query

swagger: '2.0'
paths:
  '/inlineTest/{pathParameter}':
    get:
      responses:
        '200':
          description: ''
      parameters:
        - name: pathParameter
          in: path
          required: true
          type: string
          description: Parameter in path
        - name: queryArrayParameter
          in: query
          required: false
          type: array
          items:
            type: string
          uniqueItems: true
          description: >-
            Parameter to test comma separated arrays in URL/Query. Items has to
            be unique
        - name: queryParameter
          in: query
          required: true
          type: string
          description: Parameter in the query
        - name: headerParameter
          in: header
          required: false
          type: string
          description: Parameter in header
        - name: responseCode
          in: query
          required: false
          type: integer
          format: int32
          minimum: 100
          maximum: 599
          default: 200
          description: Expected response code (see inline js)
      produces:
        - application/json
      summary: Test of synapse mediator script
      description: >-
        This is a test for checking inline prototype capabilities (using
        javascript)
      x-mediation-script: "var log = mc.getServiceLog();\nvar properties = [];\nvar propertyKeySet = mc.getPropertyKeySet();\nif (propertyKeySet !== null) {\n    log.info('propertyKeySet is not null');\n\tfor(var item = propertyKeySet.iterator(); item.hasNext();) {\n      var key=item.next();\n      log.info('Item Key='+key);\n      var property={\n        key : key,\n        value : mc.getProperty(key)\n      };\n      log.info('Item Value='+property.value);\n      properties.push(property);\n    }\n}\nvar pathParameter = mc.getProperty('uri.var.pathParameter');\nvar queryParameter = mc.getProperty('query.param.queryParameter');\nvar queryArrayParameter = mc.getProperty('query.param.queryArrayParameter');\n// IMPORTANT: To use header parameters, you have to enable CORS configuration and declare the header there\nvar headerParameter = mc.getProperty('uri.var.headerParameter');\nvar formParameter = mc.getProperty('uri.var.formParameter');\nvar responseCode = mc.getProperty('query.param.responseCode');\nvar response  = {\n\tpathParameter : pathParameter,\n\tqueryParameter : queryParameter,\n        queryArrayParameter : queryArrayParameter,\n\theaderParameter : headerParameter,\n  formParameter : 'PENDING: Not implemented yet',\n\tproperties : properties\n};\n// Set the response type\nmc.setProperty('CONTENT_TYPE', 'application/json');\n// Set the response code\nmc.setProperty('HTTP_SC', responseCode);\nmc.setPayloadJSON(response);"
      x-auth-type: Application & Application User
      x-throttling-tier: Unlimited
info:
  title: Test
  version: v1
  description: Test API - In ITDEV

Answer 1

You can use mc.getPayloadJSON() to get the JSON payload, and mc.get-property('query.param.arg1') to read query params.

You can read headers like this.

Refs:

https://docs.wso2.com/display/ESB500/Script+Mediator

https://asitha.github.io/cs/programming/wso2/esb/mediators/2017/08/14/get-query-params-with-wso2-esb/