cos-js-sdk-v5
Version:
JavaScript SDK for [腾讯云对象存储](https://cloud.tencent.com/product/cos)
192 lines (183 loc) • 6.57 kB
HTML
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Form 表单简单上传（兼容 IE8）（服务端计算签名）</title>
<style>
h1,
h2 {
font-weight: normal;
}
#msg {
margin-top: 10px;
}
</style>
</head>
<body>
<h1>Form 表单简单上传（兼容 IE8）（服务端计算签名）</h1>
<div>最低兼容到 IE6 上传，不支持 onprogress</div>
<form
id="form"
target="submitTarget"
action=""
method="post"
enctype="multipart/form-data"
accept="*/*"
>
<input id="name" name="name" type="hidden" value="" />
<input name="success_action_status" type="hidden" value="200" />
<input
id="success_action_redirect"
name="success_action_redirect"
type="hidden"
value=""
/>
<input id="key" name="key" type="hidden" value="" />
<input id="policy" name="policy" type="hidden" value="" />
<input
id="q-sign-algorithm"
name="q-sign-algorithm"
type="hidden"
value=""
/>
<input id="q-ak" name="q-ak" type="hidden" value="" />
<input id="q-key-time" name="q-key-time" type="hidden" value="" />
<input id="q-signature" name="q-signature" type="hidden" value="" />
<input name="Content-Type" type="hidden" value="" />
<input
id="x-cos-security-token"
name="x-cos-security-token"
type="hidden"
value=""
/>
<!-- 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>
(function () {
const form = document.getElementById('form');
let prefix = '';
// 对更多字符编码的 url encode 格式
const camSafeUrlEncode = function (str) {
return encodeURIComponent(str)
.replace(/!/g, '%21')
.replace(/'/g, '%27')
.replace(/\(/g, '%28')
.replace(/\)/g, '%29')
.replace(/\*/g, '%2A');
};
// 计算签名
const getAuthorization = function (opt, callback) {
// 替换为自己服务端地址 获取post上传签名
const url = `http://127.0.0.1:3000/post-policy?ext=${opt.ext || ''}`;
const xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.onload = function (e) {
let credentials;
try {
const result = JSON.parse(e.target.responseText);
credentials = result;
} catch (e) {
callback('获取签名出错');
}
if (credentials) {
callback(null, {
securityToken: credentials.securityToken,
cosKey: credentials.cosKey,
cosHost: credentials.cosHost,
policy: credentials.policy,
qAk: credentials.qAk,
qKeyTime: credentials.qKeyTime,
qSignAlgorithm: credentials.qSignAlgorithm,
qSignature: credentials.qSignature,
});
} else {
console.error(xhr.responseText);
callback('获取签名出错');
}
};
xhr.send();
};
// 监听上传完成
let Key;
const submitTarget = document.getElementById('submitTarget');
const showMessage = function (err, data) {
console.log(err || data);
document.getElementById('msg').innerText = err
? err
: '上传成功，ETag=' + data.ETag;
};
submitTarget.onload = function () {
let search;
try {
search = submitTarget.contentWindow.location.search.substr(1);
} catch (e) {
showMessage('文件 ' + Key + ' 上传失败');
}
if (search) {
const items = search.split('&');
let i = 0;
let arr = [];
const 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 {
}
};
// 发起上传
document.getElementById('submitBtn').onclick = function (e) {
const filePath = document.getElementById('fileSelector').value;
if (!filePath) {
document.getElementById('msg').innerText = '未选择上传文件';
return;
}
let ext = '';
const lastDotIndex = filePath.lastIndexOf('.');
if (lastDotIndex > -1) {
// 这里获取文件后缀 由服务端生成最终上传的路径
ext = filePath.substring(lastDotIndex + 1);
}
getAuthorization({ ext }, function (err, AuthData) {
if (err) {
alert(err);
return;
}
const protocol =
location.protocol === 'https:' ? 'https:' : 'http:';
prefix = protocol + '//' + AuthData.cosHost;
form.action = prefix;
Key = AuthData.cosKey;
// 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
document.getElementById('success_action_redirect').value =
location.href.substr(0, location.href.lastIndexOf('/') + 1) +
'empty.html';
document.getElementById('key').value = AuthData.cosKey;
document.getElementById('policy').value = AuthData.policy;
document.getElementById('q-sign-algorithm').value =
AuthData.qSignAlgorithm;
document.getElementById('q-ak').value = AuthData.qAk;
document.getElementById('q-key-time').value = AuthData.qKeyTime;
document.getElementById('q-signature').value = AuthData.qSignature;
document.getElementById('x-cos-security-token').value =
AuthData.securityToken || '';
form.submit();
});
};
})();
</script>
</body>
</html>