php調用phantomjs給微信小程序分享

背景

• 以前已經使用golang寫過調用phantomjs的文章
• CTO不讓我使用golang因此只好使用php調用phantomjs
• packagist上的composer包功能很冗餘,我只須要用到phantomjs的截圖功能

知識儲備

• *unix系統安裝phantomjs,權限相關知識
• 基本JavaScript語法知識
• php exec函數調用REPL phantomjs
• phantomjs js截圖文檔 http://javascript.ruanyifeng....

代碼(php 代碼環境爲yii2框架)

<?php

namespace weapp\library\phantomjs;

use weapp\library\BizException;

class ScreenShot
{
    /** @var string 獲取phantomjs 參數中 js文件的決定路徑 */
    private $js_path;
    /** @var bool|string 獲取php 有777權限的臨時文件目錄 */
    private $temp_dir;

    function __construct()
    {
        $dir = __DIR__;
        $this->js_path = "{$dir}/script.js";
        /** @var bool|string 獲取php 有777權限的臨時文件目錄 */
        $this->temp_dir = \Yii::getAlias('@runtime');
    }

    /**
     * 截圖並上傳
     * @param string $url
     * @param string $filename
     * @return string
     * @throws BizException
     */
    public function screenShotThenSaveToOss(string $url, string $filename = 'temp.jpg')
    {
        //輸出圖片的路徑
        $outputFilePath = "{$this->temp_dir}/$filename";
        //執行的phantomjs命令
        //phantomjs 可執行文件必須是 絕對路徑 不然致使 exec 函數返回值127錯誤
        $cmd = "\usr\local\bin\phantomjs {$this->js_path} '$url' '$outputFilePath'";
        //捕捉不到phantomjs命令輸出結果
        exec($cmd, $output);
        //檢查截圖文件是否存在
        $isShotImgaeExist = file_exists($outputFilePath);
        if (!$isShotImgaeExist) {
            throw new BizException(0, 'phantomjs截圖失敗', BizException::SELF_DEFINE);
        }
        //保存截圖到oss
        $result = $this->postScreenShotImageToOss($outputFilePath);
        //刪除臨時文件夾的截圖圖片
        unlink($outputFilePath);
        return $result;
    }


    /**
     * 上傳截圖到阿里雲直傳oss
     * @param string $screenshot_path
     * @return string
     */
    public function postScreenShotImageToOss(string $screenshot_path): string
    {
        $ossKey = 'raw_file_name';

        $file = new \CURLFile($screenshot_path, 'image/jpeg', 'file');
        $tokenArray = $this->getOssPolicyToken('fetch');
        $url = $tokenArray->host;
        $postData = [
            'key' => "{$tokenArray->dir}/$ossKey",
            'policy' => $tokenArray->policy,
            'OSSAccessKeyId' => $tokenArray->accessid,
            'success_action_status' => '200',
            'signature' => $tokenArray->signature,
            'callback' => $tokenArray->callback,
            'file' => $file
        ];
        $ch = curl_init();
        //$data = array('name' => 'Foo', 'file' => '@/home/user/test.png');
        curl_setopt($ch, CURLOPT_URL, $url);
        // Disable SSL verification
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_SAFE_UPLOAD, true); // required as of PHP 5.6.0
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 20);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        //curl_setopt($ch, CURLOPT_HTTPHEADER, ["Content-Type: $mime_type"]);

        $res = curl_exec($ch);
        $res = json_decode($res);
        curl_close($ch);
        if (empty($res) || $res->code != 0) {
            return '';
        } else {
            return $res->data->url;
        }
    }

    /**
     * 調用管理後臺阿里雲oss token接口
     * @param null $url
     * @return array
     */
    public function getOssPolicyToken($url = null)
    {
        $url = \Yii::$app->params['oss_screen_shot_token_api'];
        $ch = curl_init();
        // Disable SSL verification
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        // Will return the response, if false it print the response
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        // Set the url
        curl_setopt($ch, CURLOPT_URL, $url);
        // Execute
        $result = curl_exec($ch);
        // Closing
        curl_close($ch);
        $res = json_decode($result);
        if (empty($res) || $res->code != 0) {
            return [];
        } else {
            return $res->data;
        }
    }
}

phantomjs javascript腳本內容

"use strict";
var system = require('system');
var webPage = require('webpage');
var page = webPage.create();
//設置phantomjs的瀏覽器user-agent
page.settings.userAgent = 'Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1';

//獲取php exec 函數的命令行參數
if (system.args.length !== 3) {
    console.log(system.args);
    console.log('參數錯誤');
    console.log('第2個參數爲url地址 第3個參數爲截圖文件名稱');
    phantom.exit(1);
}

//命令行 截圖網址參數
var url = system.args[1];
//圖片輸出路徑
var filePath = system.args[2];
console.log('-------');
console.log(url);
console.log('-------');
console.log(filePath);
console.log('-------');

//設置瀏覽器視口
page.viewportSize = {width: 480, height: 960};
//打開網址
page.open(url, function start(status) {
    //1000ms以後開始截圖
    setTimeout(function () {
        //截圖格式爲jpg 80%的圖片質量
        page.render(filePath, {format: 'jpg', quality: '80'});
        console.log('success');
        //退出phantomjs 避免phantomjs致使內存泄露
        phantom.exit();
    }, 1000);
});

php調用phantomjs目錄結構