微信公众平台消息接口开发（3）中英翻译

要做一个翻译账号，有以下几步：

一. 有翻译接口：

目前有道词典提供了翻译接口，申请地址 http://fanyi.youdao.com/openapi?path=data-mode

下面是申请介绍：

申请完成后，会收到邮件，邮件中有api key：

数据接口

http://fanyi.youdao.com/openapi.do?keyfrom=<keyfrom>&key=<key>&type=data&doctype=<doctype>&version=1.1&q=要翻译的文本

版本：1.1，请求方式：get，编码方式：utf-8

主要功能：中英互译，同时获得有道翻译结果和有道词典结果（可能没有）

参数说明：

　type - 返回结果的类型，固定为data
　doctype - 返回结果的数据格式，xml或json或jsonp
　version - 版本，当前最新版本为1.1
　q - 要翻译的文本，必须是UTF-8编码，字符长度不能超过200个字符，需要进行urlencode编码
errorCode：
　0 - 正常
　20 - 要翻译的文本过长
　30 - 无法进行有效的翻译
　40 - 不支持的语言类型
　50 - 无效的key

json数据格式举例

http://fanyi.youdao.com/openapi.do?keyfrom=<keyfrom>&key=<key>&type=data&doctype=json&version=1.1&q=good

{
    "errorCode":0
    "query":"good",
    "translation":["好"], // 有道翻译
    "basic":{ // 有道词典-基本词典
        "phonetic":"gʊd"
        "uk-phonetic":"gʊd" //英式发音
        "us-phonetic":"ɡʊd" //美式发音
        "explains":[
            "好处",
            "好的"
            "好"
        ]
    },
    "web":[ // 有道词典-网络释义
        {
            "key":"good",
            "value":["良好","善","美好"]
        },
        {...}
    ]
}

二程序实现：

有道翻译的源码：需要自己申请key，然后填入

微信调用

define("TOKEN", "qq612312312312");

            
$wechatObj = new wechatCallbackapiTest();
$wechatObj->responseMsg();

class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];
        //valid signature , option
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    public function responseMsg()
    {
        //get post data, May be due to the different environments
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        logger("R ".$postStr);
        //extract post data
        if (!empty($postStr)){
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);

            switch ($RX_TYPE)
            {
                case "text":
                    $resultStr = $this->receiveText($postObj);
                    break;
                case "event":
                    $resultStr = $this->receiveEvent($postObj);
                    break;
                default:
                    $resultStr = "unknow msg type: ".$RX_TYPE;
                    break;
            }
            logger("T ".$resultStr);
            echo $resultStr;
        }else {
            echo "";
            exit;
        }
    }

    private function checkSignature()
    {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];

        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );

        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }

    private function receiveText($object)
    {
        $funcFlag = 0;
        $keyword = trim($object->Content);
        $resultStr = "";
        $cityArray = array();
        $contentStr = "";
        $needArray = false;
        $illegal = false;
        $saytome = false;
        
        if (1 == 1){
            $contentStr = translate($keyword);
            $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
            return $resultStr;
        }
        //Content 消息内容，大小限制在2048字节，字段为空为不合法请求
        return $resultStr;
    }
    
    private function receiveEvent($object)
    {
        $contentStr = "";
        switch ($object->Event)
        {
            case "subscribe":
                $contentStr = "请直说，我将为你自动翻译";
                break;
            case "unsubscribe":
                $contentStr = "";
                break;
            case "CLICK":
                switch ($object->EventKey)
                {
                    default:
                        $contentStr = "receive a eventkey: ".$object->EventKey;
                        break;
                }
                break;
            default:
                $contentStr = "receive a new event: ".$object->Event;
                break;
        }
        $resultStr = $this->transmitText($object, $contentStr);
        return $resultStr;
    }
    
    private function transmitText($object, $content, $flag = 0)
    {
        $textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
<FuncFlag>%d</FuncFlag>
</xml>";
        $resultStr = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $content, $flag);
        return $resultStr;
    }
}