react-native-omplayer/scripts/postinstall.js

video player for react-native

// 下载https://resource.ibrainbaby.cn/FFmpeg.zip，解压到ios/FFmpeg下
const crypto = require('crypto');
const fs = require('fs');
const http = require('https');  
const path = require('path');
var ProgressBar = require('progress');

var adm_zip = require('adm-zip');
const tZipUrl = 'https://resource.ibrainbaby.cn/FFmpeg.zip';  

const downloadPath = path.resolve(__dirname, '../ios/FFmpeg.zip')
// const zipMD5 = '653ad60530b0ff2853408a9cea5ee5e1';
const zipMD5 = 'c53541150b603fdab683117d7b7faba4';

let retry = 0;
const MAX_RETRY = 2;

const md5File = function (path, callback) {
    fs.readFile(path, function(err, data) {
        if (err) {
            console.log(err);
            return;
        }
        var md5Value= crypto.createHash('md5').update(data, 'utf8').digest('hex');
        callback(md5Value);
    });
}



const unzipFile = function() {
    console.log('文件开始解压')
    const zipPath = path.resolve(__dirname, '../ios')
    var unzip = new adm_zip(downloadPath);
    unzip.extractAllTo(zipPath);
    deleteFolderRecursive(path.resolve(zipPath, './__MACOSX'))
    console.log('压缩成功');
    fs.exists(downloadPath, (exists) => {
        if (exists) {
            fs.unlinkSync(downloadPath);
        }
    })  
}

const deleteFolderRecursive = function(path) {
    if( fs.existsSync(path) ) {
        fs.readdirSync(path).forEach(function(file) {
            var curPath = path + "/" + file;
            if(fs.statSync(curPath).isDirectory()) { // recurse
                deleteFolderRecursive(curPath);
            } else { // delete file
                fs.unlinkSync(curPath);
            }
        });
        fs.rmdirSync(path);
    }
};

const downLoadTask = function () {
    let receivedBytes = 0;
    let totalBytes = 0;
    let bar = null;

    fs.exists(downloadPath, (exists) => {
        if (exists) {
            md5File(downloadPath, (md5Hash) => {
                if (md5Hash === zipMD5) {
                    unzipFile();
                } else {
                    retryFn();
                }
            });
        } else {
            const req = http.get(tZipUrl, (res) => {
                console.log('下载中。。。');
                let chunks = [];  
                res.on('data', (chunk) => {
                    chunks.push(chunk);  
                    receivedBytes += chunk.length;
                    bar.tick(chunk.length)
                });
                res.on('end', (data) => {
                    var data = null;  
                    switch(chunks.length) {  
                        case 0: data = new Buffer.alloc(0);
                        break;  
                        case 1: data = chunks[0];  
                        break;  
                        default:  
                        data = new Buffer.alloc(receivedBytes);  
                        for (var i = 0, pos = 0, l = chunks.length; i < l; i++) {  
                            var chunk = chunks[i];  
                            chunk.copy(data, pos);  
                            pos += chunk.length;  
                        }  
                        break;  
                    }
                    fs.writeFile(downloadPath, data, function(err) {
                        if (err) {
                            console.log('保存失败');
                            retryFn();
                        } else {
                            console.log('保存成功');
                            md5File(downloadPath, (md5Hash) => {
                                if (md5Hash === zipMD5) {
                                    unzipFile();
                                } else {
                                    retryFn();
                                }
                            });
                        }
                    } )
                });
                res.on('error', function(err) {
                    retryFn();
                });


            })
            req.on('response', (data) => {
                totalBytes = parseInt(data.headers['content-length'], 10);
                bar = new ProgressBar('  downloading [:bar] :rate/bps :percent :etas', {
                    complete: '=',
                    incomplete: ' ',
                    width: 20,
                    total: totalBytes
                });
            });
        }
    });
}


const retryFn = function() {
    fs.exists(downloadPath, (exists) => {
        if (exists) {
            fs.unlinkSync(downloadPath);  
        }
        retry += 1;
        if (retry < MAX_RETRY) {
            console.log(`请求失败..正在第${retry}次尝试`);
            downLoadTask();
        } else {
            console.log('请求失败');
        }   
    })

}
downLoadTask();