如何使用各语言SDK提供的接口执行HTTP函数

背景信息

函数计算服务会根据请求头部的Authorization字段来校验每一个请求是否合法。

说明设置了HTTP触发器的允许匿名访问的函数不可以校验。

您须使用与函数计算服务端一致的签名算法才能通过验证。未包含签名字段或者签名错误的请求，函数计算将会返回HTTP 403错误。具体信息，请参见签名认证。

函数计算提供的SDK中已经提供了接口执行HTTP触发器函数，无需您手动计算。具体信息，请参见SDK列表。

Java

执行以下代码，将Maven依赖项添加到pom.xml中。

    <dependency>
      <groupId>com.aliyun</groupId>
      <artifactId>aliyun-java-sdk-fc</artifactId>
      <version>1.8.32</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>2.0.20</version>
    </dependency>

代码示例。更多接口信息，请参见SDK源码。

import com.alibaba.fastjson.JSONObject;
import com.aliyuncs.fc.client.FunctionComputeClient;
import com.aliyuncs.fc.model.HttpAuthType;
import com.aliyuncs.fc.model.HttpMethod;
import com.aliyuncs.fc.request.*;
import com.aliyuncs.fc.response.*;
import java.io.IOException;
import java.security.InvalidKeyException;

public class testJavaSDK {
    private static final String REGION = "cn-hangzhou";
    private static final String SERVICE_NAME = "<Your serviceName>";
    private static final String FUNCTION_NAME = "<Your functionName>";
    public static void main(final String[] args) throws IOException, InvalidKeyException, IllegalStateException {
        String accountId = "XXX";
        String accessKey = "XXX";
        String accessSecretKey = "XXX";
        FunctionComputeClient fcClient = new FunctionComputeClient(REGION, accountId, accessKey, accessSecretKey);
        HttpInvokeFunctionRequest request = new HttpInvokeFunctionRequest(SERVICE_NAME,FUNCTION_NAME, HttpAuthType.FUNCTION, HttpMethod.POST, null);
        JSONObject object = new JSONObject();
        object.put("string","string");
        object.put("int","123");
        String payload = object.toJSONString();
        request.setPayload(payload.getBytes());
        request.setHeader("Content-Type", "application/json");
        InvokeFunctionResponse invkResp = fcClient.invokeFunction(request);
        System.out.println(new String(invkResp.getContent()));
    }
}

Python

执行以下代码安装依赖。
```
pip install aliyun-fc2
```

代码示例。更多接口信息，请参见SDK源码。

# -*- coding: utf-8 -*-

import fc2
client = fc2.Client(
    endpoint='<Your Endpoint>',
    accessKeyID='<Your AccessKeyID>',
    accessKeySecret='<Your AccessKeySecret>')
req = client.do_http_request( "method", "serviceName", "functionName", "path", headers={}, params=None, body=bytes('hello_world'.encode('utf-8')))
print (req.status_code)

PHP

您可以通过以下两种方式安装依赖。
- 执行Composer命令安装依赖。
```
composer require aliyunfc/fc-php-sdk
```
- 在composer.json文件中声明对Alibaba Cloud FC SDK for PHP的依赖关系。
```
"require":{
    "aliyunfc/fc-php-sdk": "~1.2"
}
```
运行composer install——no dev安装依赖项。安装Composer依赖关系管理器后，在PHP代码中导入依赖关系。
```
require_once __DIR__ . '/vendor/autoload.php';
```

代码示例。更多接口信息，请参见SDK源码。

<?php
require_once __DIR__ . '/vendor/autoload.php';
use AliyunFC\Client;
$fcClient = new Client([
  "endpoint" => '<Your Endpoint>',
  "accessKeyID" =>'<Your AccessKeyID>',
  "accessKeySecret" =>'<Your AccessKeySecret>'
]);
$res = $fcClient->doHttpRequest("method", "serviceName", "functionName", "path", $headers = [], $unescapedQueries = [], $data = null);
$s = $res->getStatusCode();
$data = $res->getBody()->getContents();
var_dump($s);
var_dump($data);

Node.js

执行以下代码安装依赖。
```
npm install @alicloud/fc2 --save
```

代码示例。GET请求调用示例如下，更多接口信息，请参见SDK源码。

'use strict';
var FCClient = require('@alicloud/fc2');
var client = new FCClient('<Your AccountID>', {
  accessKeyID: '<Your AccessKeyID>',
  accessKeySecret: '<Your AccessKeySecret>',
  region: '<Your Region>',
});
async function test () {
  try {
      var headers ={}
      var resp = await client.get('/proxy/${serviceName}/${functionName}/${path}',null,headers )
      console.log('invoke function: %j', resp);
  } catch (err) {
      console.error(err);
    }
}
test().then();

.NET Core

执行以下代码，在.csproj文件中添加如下package安装依赖。

<ItemGroup>
    <PackageReference Include="Aliyun.FC.SDK.NetCore" Version="1.0.0" />
</ItemGroup>

代码示例。更多接口信息，请参见SDK源码。

using System;
using System.Collections.Generic;
using Aliyun.FunctionCompute.SDK.Client;
using Aliyun.FunctionCompute.SDK.Request;

namespace mynetcore{
    class Program
    {
        static void Main(string[] args)
        {
            var fcClient = new FCClient("<Your Region>", "<Your AccountID>", "<Your AccessKeyID>", "<Your AccessKeySecret>");
            var customHeaders = new Dictionary<string, string> {

            };
            Dictionary<string, string[]> unescapedQueries = new Dictionary<string, string[]> {

            };
            byte[] payload = new byte[]{

            };

           var resposnse = fcClient.InvokeHttpFunction(new HttpInvokeFunctionRequest("serviceName", "functionName", "method", "path", "qualifier", payload, unescapedQueries ,customHeaders));
            Console.WriteLine(resposnse.StatusCode);
        }
    }
}

Go

执行以下代码安装依赖。
```
go get -u github.com/aliyun/fc-go-sdk
```

代码示例。更多接口信息，请参见SDK源码。

import (
       "fmt"
       "io"
       "net/http"
       "time"

       fc "github.com/aliyun/fc-go-sdk"
)

func doPost(serviceName, functionName, qualifier, path string,
       headers http.Header, queries map[string][]string, bodyReader io.Reader) (*http.Response, error) {


       fcClient, _ := fc.NewClient("<Your Endpoint>", "2016-08-15", "<Your AccessKeyID>",  "<Your AccessKeySecret>")
       method := http.MethodPost
       expires := time.Now().Add(5 * time.Minute)
       input := fc.NewSignURLInput(method, serviceName, functionName, expires)
       input.WithQualifier(qualifier).WithHeader(headers).WithQueries(queries).WithEscapedPath(path)
       url, err := fcClient.SignURL(input)
       if err != nil {
               return nil, err
       }
       req, err := http.NewRequest(method, url, bodyReader)
       for k, values := range headers {
             for _, v := range values {
                   req.Header.Add(k,v)
             }
       }
       c := &http.Client{}
       return c.Do(req)
}