阿里云OSS前端直接上传(服务端签名直传并设置上传回调)
前端直传文件到OSS的好处是减轻后台服务器的中转压力,但是前往不能使用明文直传的模式,否则可能被盗取appkey和appsecretkey(可参考我之前这篇文章:https://ranjuan.cn/get-aliyun-oss-appkeysecret/)
本文介绍采前端根据从服务器( 后端使用的是php7.1 )获取policy、accessid、signature,直接提交上传到阿里云oss服务器,上传成功后会回调你配置的回调地址,实现后台将oss地址存入数据库的方法。
实现的流程大致如下: 1、index.html中upload.js --> 访问get.php返回授权票据信息 2、upload.js根据返回的信息,直传文件到阿里云oss 3、阿里云oss服务器收到请求后,将前端的传过来的文件进行存储,并将一起传过来的callback参数回调到callback.php 4、callback.php对回调参数进行解密等处理并返回阿里oss处理结果 5、阿里oss将收到的处理结果返回给index.html 6、index.html显示上传成功
下面附部分源码:
index.html(http://ranjuan.cn/AliOSS_test/js-oss-service/index.html)
<!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"/> <title>OSS web直传</title> <link rel="stylesheet" type="text/css" href="style.css"/> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"> </head> <body> <h2>OSS web直传---在服务端php签名, OSS会在文件上传成功,回调用户设置的回调url</h2> <ol> <li>基于plupload封装 </li> <li>支持html5,flash,silverlight,html4 等协议上传</li> <li>可以运行在PC浏览器,手机浏览器,微信</li> <li>签名在服务端(php)完成, 安全可靠, 推荐使用!</li> <li>显示上传进度条</li> <li>可以控制上传文件的大小,允许上传文件的类型,本例子设置了,只能上传jpg,png,gif结尾和zip,rar文件,最大大小是10M</li> <li>最关键的是,让你10分钟之内就能移植到你的系统,实现以上牛逼的功能!</li> <li>注意一点:bucket必须设置了Cors(Post打勾),不然没有办法上传</li> <li>注意一点:此例子默认是上传到user-dir目录下面,这个目录的设置是在php/get.php, $dir变量!</li> <li>注意一点:把php/get.php里面的callbackUrl变量改成你自己的url</li> <li>注意一点:这里返回的success,是OSS已经回调应用服务器,应用服务已经返回200!</li> <li><a href="https://help.aliyun.com/document_detail/oss/practice/pc_web_upload/js_php_callback.html">点击查看详细文档</a></li> </ol> <br> <form name=theform> <input type="radio" name="myradio" value="local_name" checked=true/> 上传文件名字保持本地文件名字 <input type="radio" name="myradio" value="random_name" /> 上传文件名字是随机文件名, 后缀保留 </form> <h4>您所选择的文件列表:</h4> <div id="ossfile">你的浏览器不支持flash,Silverlight或者HTML5!</div> <br/> <div id="container"> <a id="selectfiles" href="javascript:void(0);" class='btn'>选择文件</a> <a id="postfiles" href="javascript:void(0);" class='btn'>开始上传</a> </div> <pre id="console"></pre> <p> </p> </body> <script type="text/javascript" src="lib/plupload-2.1.2/js/plupload.full.min.js"></script> <script type="text/javascript" src="upload.js"></script> <!-- <script type="text/javascript" src="lib/plupload-2.1.2/js/plupload.full.min.js"></script> <script type="text/javascript" src="upload.js"></script>--> </html>
upload.js
// http://ranjuan.cn/AliOSS_test/js-oss-service/upload.js accessid = '' accesskey = '' host = '' policyBase64 = '' signature = '' callbackbody = '' filename = '' key = '' expire = 0 g_object_name = '' g_object_name_type = '' now = timestamp = Date.parse(new Date()) / 1000; function send_request() { var xmlhttp = null; if (window.XMLHttpRequest) { xmlhttp=new XMLHttpRequest(); } else if (window.ActiveXObject) { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } if (xmlhttp!=null) { // serverUrl是 用户获取 '签名和Policy' 等信息的应用服务器的URL,请将下面的IP和Port配置为您自己的真实信息。 // serverUrl = 'http://88.88.88.88:8888/aliyun-oss-appserver-php/php/get.php' //serverUrl = './php/get.php' serverUrl = './php/get.php' xmlhttp.open( "GET", serverUrl, false ); xmlhttp.send( null ); return xmlhttp.responseText } else { alert("Your browser does not support XMLHTTP."); } }; //-------- function check_object_radio() { var tt = document.getElementsByName('myradio'); for (var i = 0; i < tt.length ; i++ ) { if(tt[i].checked) { g_object_name_type = tt[i].value; break; } } } function get_signature() { // 可以判断当前expire是否超过了当前时间, 如果超过了当前时间, 就重新取一下,3s 作为缓冲。 now = timestamp = Date.parse(new Date()) / 1000; if (expire < now + 3) { body = send_request() var obj = eval ("(" + body + ")"); host = obj['host'] policyBase64 = obj['policy'] accessid = obj['accessid'] signature = obj['signature'] expire = parseInt(obj['expire']) callbackbody = obj['callback'] key = obj['dir'] return true; } return false; }; function random_string(len) { len = len || 32; var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; var maxPos = chars.length; var pwd = ''; for (i = 0; i < len; i++) { pwd += chars.charAt(Math.floor(Math.random() * maxPos)); } return pwd; } function get_suffix(filename) { pos = filename.lastIndexOf('.') suffix = '' if (pos != -1) { suffix = filename.substring(pos) } return suffix; } function calculate_object_name(filename) { if (g_object_name_type == 'local_name') { g_object_name += "${filename}" } else if (g_object_name_type == 'random_name') { suffix = get_suffix(filename) g_object_name = key + random_string(10) + suffix } return '' } function get_uploaded_object_name(filename) { if (g_object_name_type == 'local_name') { tmp_name = g_object_name tmp_name = tmp_name.replace("${filename}", filename); return tmp_name } else if(g_object_name_type == 'random_name') { return g_object_name } } function set_upload_param(up, filename, ret) { if (ret == false) { ret = get_signature() } g_object_name = key; if (filename != '') { suffix = get_suffix(filename) calculate_object_name(filename) } new_multipart_params = { 'key' : g_object_name, 'policy': policyBase64, 'OSSAccessKeyId': accessid, 'success_action_status' : '200', //让服务端返回200,不然,默认会返回204 'callback' : callbackbody, 'signature': signature, }; up.setOption({ 'url': host, 'multipart_params': new_multipart_params }); up.start(); } //------------- var uploader = new plupload.Uploader({ // runtimes : 'html5,flash,silverlight,html4', browse_button : 'selectfiles', //multi_selection: false, container: document.getElementById('container'), flash_swf_url : 'lib/plupload-2.1.2/js/Moxie.swf', silverlight_xap_url : 'lib/plupload-2.1.2/js/Moxie.xap', url : 'http://oss.aliyuncs.com', filters: { mime_types : [ //只允许上传图片和zip文件 { title : "Image files", extensions : "jpg,gif,png,bmp" }, { title : "Zip files", extensions : "zip,rar" } ], max_file_size : '10mb', //最大只能上传10mb的文件 prevent_duplicates : true //不允许选取重复文件 } }); uploader.init(); //初始 uploader.bind('PostInit',function(){ // PostInit: function() { document.getElementById('ossfile').innerHTML = ''; document.getElementById('postfiles').onclick = function() { // alert('xx'); set_upload_param(uploader, '', false); return false; }; }); uploader.bind('FilesAdded',function(up,files){ plupload.each(files, function(file) { document.getElementById('ossfile').innerHTML += '<div id="' + file.id + '">' + file.name + ' (' + plupload.formatSize(file.size) + ')<b></b>' +'<div class="progress"><div class="progress-bar" style="width: 0%"></div></div>' +'</div>'; }); }); uploader.bind('BeforeUpload',function(up,file){ check_object_radio(); set_upload_param(up, file.name, true); }); //绑定文件上传进度事件 uploader.bind('UploadProgress',function(up,file){ var d = document.getElementById(file.id); d.getElementsByTagName('b')[0].innerHTML = '<span>' + file.percent + "%</span>"; var prog = d.getElementsByTagName('div')[0]; var progBar = prog.getElementsByTagName('div')[0] progBar.style.width= 2*file.percent+'px'; progBar.setAttribute('aria-valuenow', file.percent); }); uploader.bind('FileUploaded',function(up,file,info){ if (info.status == 200) { document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = 'upload to oss success, object name:' + get_uploaded_object_name(file.name) + ' 回调服务器返回的内容是:' + info.response; } else if (info.status == 203) { document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = '上传到OSS成功,但是oss访问用户设置的上传回调服务器失败,失败原因是:' + info.response; } else { document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = info.response; } }); uploader.bind('Error',function(up,err){ // Error: function(up, err) { if (err.code == -600) { document.getElementById('console').appendChild(document.createTextNode("\n选择的文件太大了,可以根据应用情况,在upload.js 设置一下上传的最大大小")); } else if (err.code == -601) { document.getElementById('console').appendChild(document.createTextNode("\n选择的文件后缀不对,可以根据应用情况,在upload.js进行设置可允许的上传文件类型")); } else if (err.code == -602) { document.getElementById('console').appendChild(document.createTextNode("\n这个文件已经上传过一遍了")); } else { document.getElementById('console').appendChild(document.createTextNode("\nError xml:" + err.response)); } }); /* }//init shanhuc }); */ //uploader.init();
get.php
<?php //get.php //http://ranjuan.cn/AliOSS_test/js-oss-service/php/get.php function gmt_iso8601($time) { $dtStr = date("c", $time); $mydatetime = new DateTime($dtStr); $expiration = $mydatetime->format(DateTime::ISO8601); $pos = strpos($expiration, '+'); $expiration = substr($expiration, 0, $pos); return $expiration."Z"; } $id= 'LTAI4Fx46XE'; // 请填写您的AccessKeyId。 $key= 'zLyQFH8JBtiNfGPdv9T3'; // 请填写您的AccessKeySecret。 // $host的格式为 bucketname.endpoint,请替换为您的真实信息。 $host = 'https://wodeoss.oss-cn-hangzhou.aliyuncs.com'; //echo 'xxxx'; 输出格式不符合预期 // $callbackUrl为上传回调服务器的URL,请将下面的IP和Port配置为您自己的真实URL信息。 $callbackUrl = 'http://ranjuan.cn/AliOSS_test/js-oss-service/php/callback.php'; $dir = 'user-dir-prefix/'; // 用户上传文件时指定的前缀。 $callback_param = array('callbackUrl'=>$callbackUrl, 'callbackBody'=>'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}', 'callbackBodyType'=>"application/x-www-form-urlencoded");//这里的callbackBody是阿里云回调 传递参数到回调地址-->$callbackUrl //回调信息可根据前端进行一些自定义配置,这样就可以实现后端将上传文件关联id存入数据库! $callback_string = json_encode($callback_param); $base64_callback_body = base64_encode($callback_string); $now = time(); $expire = 30; //设置该policy超时时间是10s. 即这个policy过了这个有效时间,将不能访问。 $end = $now + $expire; $expiration = gmt_iso8601($end); //最大文件大小.用户可以自己设置 $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000); $conditions[] = $condition; // 表示用户上传的数据,必须是以$dir开始,不然上传会失败,这一步不是必须项,只是为了安全起见,防止用户通过policy上传到别人的目录。 $start = array(0=>'starts-with', 1=>'$key', 2=>$dir); $conditions[] = $start; $arr = array('expiration'=>$expiration,'conditions'=>$conditions); $policy = json_encode($arr); $base64_policy = base64_encode($policy); $string_to_sign = $base64_policy; $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true)); $response = array(); $response['accessid'] = $id; $response['host'] = $host; $response['policy'] = $base64_policy; $response['signature'] = $signature; $response['expire'] = $end; $response['callback'] = $base64_callback_body; $response['dir'] = $dir; // 这个参数是设置用户上传文件时指定的前缀。 echo json_encode($response); ?>
callback.php
<?php //callback.php // http://ranjuan.cn/AliOSS_test/js-oss-service/php/callback.php // 1.获取OSS的签名header和公钥url header $authorizationBase64 = ""; $pubKeyUrlBase64 = ""; /* * 注意:如果要使用HTTP_AUTHORIZATION头,你需要先在apache或者nginx中设置rewrite,以apache为例,修改 * 配置文件/etc/httpd/conf/httpd.conf(以你的apache安装路径为准),在DirectoryIndex index.php这行下面增加以下两行 RewriteEngine On RewriteRule .* - [env=HTTP_AUTHORIZATION:%{HTTP:Authorization},last] * */ if (isset($_SERVER['HTTP_AUTHORIZATION'])) { $authorizationBase64 = $_SERVER['HTTP_AUTHORIZATION']; } if (isset($_SERVER['HTTP_X_OSS_PUB_KEY_URL'])) { $pubKeyUrlBase64 = $_SERVER['HTTP_X_OSS_PUB_KEY_URL']; } if ($authorizationBase64 == '' || $pubKeyUrlBase64 == '') { header("http/1.1 403 Forbidden"); exit(); } // 2.获取OSS的签名 $authorization = base64_decode($authorizationBase64); // 3.获取公钥 $pubKeyUrl = base64_decode($pubKeyUrlBase64); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $pubKeyUrl); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10); $pubKey = curl_exec($ch); if ($pubKey == "") { //header("http/1.1 403 Forbidden"); exit(); } // 4.获取回调body $body = file_get_contents('php://input'); // 5.拼接待签名字符串 $authStr = ''; $path = $_SERVER['REQUEST_URI']; $pos = strpos($path, '?'); if ($pos === false) { $authStr = urldecode($path)."\n".$body; } else { $authStr = urldecode(substr($path, 0, $pos)).substr($path, $pos, strlen($path) - $pos)."\n".$body; } // 6.验证签名 $ok = openssl_verify($authStr, $authorization, $pubKey, OPENSSL_ALGO_MD5); if ($ok == 1) { header("Content-Type: application/json"); $data = array("Status"=>"Ok","detail"=>$body); echo json_encode($data); } else { //header("http/1.1 403 Forbidden"); exit(); } ?>
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