Function Compute:API Gateway triggers

Node.js

module.exports.handler = function(event, context, callback) {
   var event = JSON.parse(event);
   var content = {
     path: event.path,
     method: event.method,
     headers: event.headers,
     queryParameters: event.queryParameters,
     pathParameters: event.pathParameters,
     body: event.body
   // You can write your own logic here.
   }
   var response = {
        isBase64Encoded: false,
        statusCode: '200',
        headers: {
          'x-custom-header': 'header value'
        },
        body: content
      };
   callback(null, response)
};

Python

# -*- coding: utf-8 -*-
import json

def handler(event, context):
    event = json.loads(event)
    content = {
        'path': event['path'],
        'method': event['httpMethod'],
        'headers': event['headers'],
        'queryParameters': event['queryParameters'],
        'pathParameters': event['pathParameters'],
        'body': event['body']
    }
    # You can write your own logic here.
    rep = {
        "isBase64Encoded": "false",
        "statusCode": "200",
        "headers": {
            "x-custom-header": "no"
        },
        "body": content
    }
    return json.dumps(rep)

PHP

<?php
function handler($event, $context) {
    $event   = json_decode($event, $assoc = true);
    $content = [
        'path'            => $event['path'],
        'method'          => $event['httpMethod'],
        'headers'         => $event['headers'],
        'queryParameters' => $event['queryParameters'],
        'pathParameters'  => $event['pathParameters'],
        'body'            => $event['body'],
    ];

    $rep = [
        "isBase64Encoded" => "false",
        "statusCode"      => "200",
        "headers"         => [
            "x-custom-header" => "no",
        ],
        "body"            => $content,
    ];

    return json_encode($rep);
}

Java

Function Compute provides two handler interfaces for Java. For more information about the Java runtime, see Compile and deploy a code package.

Option 1 (recommended): PojoRequestHandler

PojoRequestHandler<I, O> lets you work with typed request and response objects instead of raw streams.

import com.aliyun.fc.runtime.Context;
import com.aliyun.fc.runtime.PojoRequestHandler;
import java.util.HashMap;
import java.util.Map;

public class ApiTriggerDemo implements PojoRequestHandler<ApiRequest, ApiResponse> {

    public ApiResponse handleRequest(ApiRequest request, Context context) {
        // Obtain API request information.
        context.getLogger().info(request.toString());
        String path = request.getPath();
        String httpMethod = request.getHttpMethod();
        String body = request.getBody();
        context.getLogger().info("path: " + path);
        context.getLogger().info("httpMethod: " + httpMethod);
        context.getLogger().info("body: " + body);

        // You can write your own logic here.

        // Sample API response.
        Map headers = new HashMap();
        boolean isBase64Encoded = false;
        int statusCode = 200;
        String returnBody = "";
        return new ApiResponse(headers, isBase64Encoded, statusCode, returnBody);
    }
}

Define the ApiRequest and ApiResponse Plain Old Java Object (POJO) classes as follows. The set() and get() methods must be complete.

import java.util.Map;

public class ApiRequest {
    private String path;
    private String httpMethod;
    private Map headers;
    private Map queryParameters;
    private Map pathParameters;
    private String body;
    private boolean isBase64Encoded;

    @Override
    public String toString() {
        return "Request{" +
                "path='" + path + '\'' +
                ", httpMethod='" + httpMethod + '\'' +
                ", headers=" + headers +
                ", queryParameters=" + queryParameters +
                ", pathParameters=" + pathParameters +
                ", body='" + body + '\'' +
                ", isBase64Encoded=" + isBase64Encoded +
                '}';
    }

    public String getPath() { return path; }
    public void setPath(String path) { this.path = path; }
    public String getHttpMethod() { return httpMethod; }
    public void setHttpMethod(String httpMethod) { this.httpMethod = httpMethod; }
    public Map getHeaders() { return headers; }
    public void setHeaders(Map headers) { this.headers = headers; }
    public Map getQueryParameters() { return queryParameters; }
    public void setQueryParameters(Map queryParameters) { this.queryParameters = queryParameters; }
    public Map getPathParameters() { return pathParameters; }
    public void setPathParameters(Map pathParameters) { this.pathParameters = pathParameters; }
    public String getBody() { return body; }
    public void setBody(String body) { this.body = body; }
    public boolean getIsBase64Encoded() { return this.isBase64Encoded; }
    public void setIsBase64Encoded(boolean base64Encoded) { this.isBase64Encoded = base64Encoded; }
}

import java.util.Map;

public class ApiResponse {
    private Map headers;
    private boolean isBase64Encoded;
    private int statusCode;
    private String body;

    public ApiResponse(Map headers, boolean isBase64Encoded, int statusCode, String body) {
        this.headers = headers;
        this.isBase64Encoded = isBase64Encoded;
        this.statusCode = statusCode;
        this.body = body;
    }

    public Map getHeaders() { return headers; }
    public void setHeaders(Map headers) { this.headers = headers; }
    public boolean getIsBase64Encoded() { return isBase64Encoded; }
    public void setIsBase64Encoded(boolean base64Encoded) { this.isBase64Encoded = base64Encoded; }
    public int getStatusCode() { return statusCode; }
    public void setStatusCode(int statusCode) { this.statusCode = statusCode; }
    public String getBody() { return body; }
    public void setBody(String body) { this.body = body; }
}

Add the following Maven dependency in your pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>apiTrigger</groupId>
    <artifactId>apiTrigger</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>com.aliyun.fc.runtime</groupId>
            <artifactId>fc-java-core</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>
</project>

Option 2: StreamRequestHandler

StreamRequestHandler gives you direct access to raw input and output streams. Convert the InputStream to the corresponding POJO class manually. The pom.xml configuration is the same as for PojoRequestHandler.

import com.aliyun.fc.runtime.Context;
import com.aliyun.fc.runtime.StreamRequestHandler;
import com.google.gson.Gson;
import java.io.*;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

public class ApiTriggerDemo2 implements StreamRequestHandler {

    public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) {
        try {
            // Convert the InputStream to a string.
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuffer stringBuffer = new StringBuffer();
            String string = "";
            while ((string = bufferedReader.readLine()) != null) {
                stringBuffer.append(string);
            }
            String input = stringBuffer.toString();
            context.getLogger().info("inputStream: " + input);
            Request req = new Gson().fromJson(input, Request.class);
            context.getLogger().info("input req: ");
            context.getLogger().info(req.toString());
            String bodyReq = req.getBody();
            Base64.Decoder decoder = Base64.getDecoder();
            context.getLogger().info("body: " + new String(decoder.decode(bodyReq)));

            // You can process your own logic here.

            // Return structure.
            Map headers = new HashMap();
            headers.put("x-custom-header", " ");
            boolean isBase64Encoded = false;
            int statusCode = 200;
            Map body = new HashMap();
            Response resp = new Response(headers, isBase64Encoded, statusCode, body);
            String respJson = new Gson().toJson(resp);
            context.getLogger().info("outputStream: " + respJson);
            outputStream.write(respJson.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                outputStream.close();
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    class Request {
        private String path;
        private String httpMethod;
        private Map headers;
        private Map queryParameters;
        private Map pathParameters;
        private String body;
        private boolean isBase64Encoded;

        @Override
        public String toString() {
            return "Request{" +
                    "path='" + path + '\'' +
                    ", httpMethod='" + httpMethod + '\'' +
                    ", headers=" + headers +
                    ", queryParameters=" + queryParameters +
                    ", pathParameters=" + pathParameters +
                    ", body='" + body + '\'' +
                    ", isBase64Encoded=" + isBase64Encoded +
                    '}';
        }

        public String getBody() {
            return body;
        }
    }

    // Function Compute must return the response to API Gateway in the following JSON format.
    class Response {
        private Map headers;
        private boolean isBase64Encoded;
        private int statusCode;
        private Map body;

        public Response(Map headers, boolean isBase64Encoded, int statusCode, Map body) {
            this.headers = headers;
            this.isBase64Encoded = isBase64Encoded;
            this.statusCode = statusCode;
            this.body = body;
        }
    }
}