<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Form 表单简单上传</title>
<style>h1, h2 {font-weight: normal;}#msg {margin-top:10px;}</style>
</head>
<body>
<h1>PostObject 上传（Policy 保护，Form 表单上传）</h1>
<div>最低兼容到 IE6 上传，使用 policy 签名保护，不支持 onprogress</div>
<form id="form" target="submitTarget" action="" method="post" enctype="multipart/form-data" accept="*/*">
<!-- file 字段放在表单最后，避免文件内容过长影响签名判断和鉴权 -->
<input id="fileSelector" name="file" type="file">
<input id="submitBtn" type="button" value="提交">
</form>
<iframe id="submitTarget" name="submitTarget" style="display:none;" frameborder="0"></iframe>
<div id="msg"></div>
<script src="common/cos-auth.min.js"></script>
<script>
(function () {
// 请求用到的参数
var Bucket = 'test-1250000000';
var Region = 'ap-guangzhou';
var protocol = location.protocol === 'https:' ? 'https:' : 'http:';
var prefix = protocol + '//' + Bucket + '.cos.' + Region + '.myqcloud.com/';
var fileSelector = document.getElementById('fileSelector');
var form = document.getElementById('form');
form.action = prefix;
// 对更多字符编码的 url encode 格式
var camSafeUrlEncode = function (str) {
return encodeURIComponent(str)
.replace(/!/g, '%21')
.replace(/'/g, '%27')
.replace(/\(/g, '%28')
.replace(/\)/g, '%29')
.replace(/\*/g, '%2A');
};
// 获取权限策略
var getPostPolicyCredentials = function (opt, callback) {
var url = 'http://127.0.0.1:3000/post-policy?key=' + encodeURIComponent(opt.Key);
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.onreadystatechange = function (e) {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
var credentials;
try {
credentials = (new Function('return ' + xhr.responseText))();
} catch (e) {}
if (credentials) {
callback(null, credentials);
} else {
console.error(xhr.responseText);
callback('获取签名出错');
}
} else {
callback('获取签名出错');
}
}
};
xhr.send();
};
// 监听上传完成
var Key;
var submitTarget = document.getElementById('submitTarget');
var showMessage = function (err, data) {
console.log(err || data);
document.getElementById('msg').innerText = err ? err : ('上传成功，ETag=' + data.ETag);
};
submitTarget.onload = function () {
var search;
try {
search = submitTarget.contentWindow.location.search.substr(1);
} catch (e) {
showMessage('文件 ' + Key + ' 上传失败');
}
if (search) {
var items = search.split('&');
var i, arr, data = {};
for (i = 0; i < items.length; i++) {
arr = items[i].split('=');
data[arr[0]] = decodeURIComponent(arr[1] || '');
}
showMessage(null, {url: prefix + camSafeUrlEncode(Key).replace(/%2F/g, '/'), ETag: data.etag});
} else {
}
};
var setFormField = function (key, value) {
var el = document.getElementById(key);
if (!el) {
el = document.createElement('input');
el.hidden = true;
el.id = key;
el.name = key;
form.insertBefore(el, fileSelector);
}
el.setAttribute('value', value); // 需要保证 file 在表单最后
el.value = value;
};
// 发起上传
document.getElementById('submitBtn').onclick = function (e) {
var filePath = document.getElementById('fileSelector').value;
if (!filePath) {
document.getElementById('msg').innerText = '未选择上传文件';
return;
}
Key = 'dir/' + filePath.match(/[\\\/]?([^\\\/]+)$/)[1]; // 这里指定上传目录和文件名
// 获取签名保护字段
getPostPolicyCredentials({
Key: Key,
}, function (err, credentials) {
// 在当前目录下放一个空的 empty.html 以便让接口上传完成跳转回来
setFormField('success_action_redirect', location.href.substr(0, location.href.lastIndexOf('/') + 1) + 'empty.html');
setFormField('key', Key);
// 使用 policy 签名保护格式
credentials.securityToken && setFormField('x-cos-security-token', credentials.securityToken);
setFormField('q-sign-algorithm', credentials.qSignAlgorithm);
setFormField('q-ak', credentials.qAk);
setFormField('q-key-time', credentials.qKeyTime);
setFormField('q-signature', credentials.qSignature);
setFormField('policy', credentials.policy);
// 提交表单
form.submit();
});
};
})();
</script>
</body>
</html>