前言
最近老板提了一个需求是要在我们给客户PDA扫码机上的app添加个拍照上传附件的功能，当时心想：手拿把掐，10分钟搞定。代码写完，本地运行上传正常，真机运行OBS初始化时提示 console is undefinde 嗯？ 什么鬼？我没写console呀，哪来的报错？
我用的是华为云官网下载的SDK: OBS BrowserJS SDK
在页面上进行引入：
import ObsClient from '../../utils/esdk-obs-browserjs-without-polyfill.3.22.3.min.js';
进行的文件上传, 百思不得骑姐，遇事不决，开始百度。看到有帖子说不支持uniapp? 那咋搞？在uniapp社区看到一篇帖子提出了两种方法: ask.dcloud.net.cn/article/387…
- 前端产生签名前端直传华为云OBS：好处是不经过自家服务器周转，减少一个环节，上传速度更快。坏处：前端产生签名的过程中，会将 AK，SK 等核心账号信息暴露，是极其危险的。
- 后端签名前端获取后直传华为云OBS：好处同上，而且由于是后端生成签名，前端获取有时效性的签名后直传云端，因此没有泄露核心账号信息的风险。
文章中介绍了第二种方法，卑微的我不敢麻烦我的后端老板，所以使用了第一种方法。
开始编写
1.创建view.vue文件添加一个拍照按钮
<template>
<view class="btn2" @click="uploadFile">拍照</view>
</template>
2.在methods中创建uploadFile()方法
methods: {
//添加附件文件
uploadFile(){
uni.chooseImage({
count: 1,
sizeType: ['original', 'compressed'],
sourceType: ['camera', 'album'], //这要注意，camera掉拍照，album是打开手机相册
success: (res) => {
this.tempFileArr.push(res); //存储
}
});
}
}
3.添加一个上传按钮
<template>
<view class="btn2" @click="uploadFile">拍照</view>
<view class="btn2" @click="saveBill">上传</view>
</template>
4.创建saveBill()方法
遍历 tempFileArr 数组，提取出每个附件进行批次上传
saveBill(){
for(let i = 0;i < this.tempFileArr.length;i++){
const tempFileItem = this.tempFileArr[i];
const fileSplit = tempFileItem.tempFiles[0].path.split('/'); //文件名称+后缀
const type = fileSplit[fileSplit.length - 1].split(".")[1]; //文件后缀
//设定policy内容
const OBSPolicy = {
"expiration": '2025-12-31T12:00:00.000Z', // uniapp ios Android 端 必须为此格式
"conditions": [
{ "bucket": "Bucket name" }, //桶名称
{ 'key': key } // 格式 'xx/a.jpg' 路径/名称.格式 (路径选填)
]
}
const policyEncoded = getPolicyEncode(OBSPolicy); //计算policy编码值
const signature = getSignature(policyEncoded, config.SecretKey); //计算 signature
//上传 使用upload组件上传即可
const formData = {
"key": key, //地址和文件名
"AccessKeyId": `自己的AccessKeyId`,
"Policy": policyEncoded,
"Signature": signature
}
/**注意我们使用：policy 编译健全内容的时候：conditions 数组里面的值，要与formdata 里面的值保持一致，不然会报错，！！！！注意，不写status的时候， 300 已下都是成功**/
uni.uploadFile({
url: Configuration.EndPoint,
filePath: tempFileItem.tempFiles[0].path,//临时文件地址
name: 'file',
formData: formData,
success: (res)=>{ //成功的回调
console.log("res", res)
},
fail: (error)=>{
console.log("error", error)
}
});
}
}
5.导入计算policy编码值和signature方法文件，感谢大佬~文件来源：pan.baidu.com/s/1s6VRkqFr… 提取码: ia78
创建OBS文件夹，存放计算方法
// Base64.js
const Base64 = {
// private property
_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
// public method for encoding
encode: function(input) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = Base64._utf8_encode(input);
while (i < input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
}
return output;
},
// public method for decoding
decode: function(input) {
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i < input.length) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = Base64._utf8_decode(output);
return output;
},
// private method for UTF-8 encoding
_utf8_encode: function(string) {
string = string.replace(/\r\n/g, "\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
} else if ((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
} else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
},
// private method for UTF-8 decoding
_utf8_decode: function(utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while (i < utftext.length) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
} else if ((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i + 1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
} else {
c2 = utftext.charCodeAt(i + 1);
c3 = utftext.charCodeAt(i + 2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
}
module.exports = Base64;
//Configuration.js
//指定OBS服务相关信息：AK，SK，EndPoint
var Configuration = {
AccessKeyId: '', //AK
bucket: '',
SecretKey: '', //SK
EndPoint: '', //上传文件的路径
};
module.exports = Configuration;
//crypto.js
/*!
* Crypto-JS v1.1.0
* http://code.google.com/p/crypto-js/
* Copyright (c) 2009, Jeff Mott. All rights reserved.
* http://code.google.com/p/crypto-js/wiki/License
*/
const Crypto = {};
(function() {
var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
// Crypto utilities
var util = Crypto.util = {
// Bit-wise rotate left
rotl: function(n, b) {
return (n << b) | (n >>> (32 - b));
},
// Bit-wise rotate right
rotr: function(n, b) {
return (n << (32 - b)) | (n >>> b);
},
// Swap big-endian to little-endian and vice versa
endian: function(n) {
// If number given, swap endian
if (n.constructor == Number) {
return util.rotl(n, 8) & 0x00FF00FF |
util.rotl(n, 24) & 0xFF00FF00;
}
// Else, assume array and swap all items
for (var i = 0; i < n.length; i++)
n[i] = util.endian(n[i]);
return n;
},
// Generate an array of any length of random bytes
randomBytes: function(n) {
for (var bytes = []; n > 0; n--)
bytes.push(Math.floor(Math.random() * 256));
return bytes;
},
// Convert a string to a byte array
stringToBytes: function(str) {
var bytes = [];
for (var i = 0; i < str.length; i++)
bytes.push(str.charCodeAt(i));
return bytes;
},
// Convert a byte array to a string
bytesToString: function(bytes) {
var str = [];
for (var i = 0; i < bytes.length; i++)
str.push(String.fromCharCode(bytes[i]));
return str.join("");
},
// Convert a string to big-endian 32-bit words
stringToWords: function(str) {
var words = [];
for (var c = 0, b = 0; c < str.length; c++, b += 8)
words[b >>> 5] |= str.charCodeAt(c) << (24 - b % 32);
return words;
},
// Convert a byte array to big-endian 32-bits words
bytesToWords: function(bytes) {
var words = [];
for (var i = 0, b = 0; i < bytes.length; i++, b += 8)
words[b >>> 5] |= bytes[i] << (24 - b % 32);
return words;
},
// Convert big-endian 32-bit words to a byte array
wordsToBytes: function(words) {
var bytes = [];
for (var b = 0; b < words.length * 32; b += 8)
bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
return bytes;
},
// Convert a byte array to a hex string
bytesToHex: function(bytes) {
var hex = [];
for (var i = 0; i < bytes.length; i++) {
hex.push((bytes[i] >>> 4).toString(16));
hex.push((bytes[i] & 0xF).toString(16));
}
return hex.join("");
},
// Convert a hex string to a byte array
hexToBytes: function(hex) {
var bytes = [];
for (var c = 0; c < hex.length; c += 2)
bytes.push(parseInt(hex.substr(c, 2), 16));
return bytes;
},
// Convert a byte array to a base-64 string
bytesToBase64: function(bytes) {
// Use browser-native function if it exists
// if (typeof btoa == "function")
return btoa(util.bytesToString(bytes));
var base64 = [], overflow;
for (var i = 0; i < bytes.length; i++) {
switch (i % 3) {
case 0:
base64.push(base64map.charAt(bytes[i] >>> 2));
overflow = (bytes[i] & 0x3) << 4;
break;
case 1:
base64.push(base64map.charAt(overflow | (bytes[i] >>> 4)));
overflow = (bytes[i] & 0xF) << 2;
break;
case 2:
base64.push(base64map.charAt(overflow | (bytes[i] >>> 6)));
base64.push(base64map.charAt(bytes[i] & 0x3F));
overflow = -1;
}
}
// Encode overflow bits, if there are any
if (overflow != undefined && overflow != -1)
base64.push(base64map.charAt(overflow));
// Add padding
while (base64.length % 4 != 0) base64.push("=");
return base64.join("");
},
// Convert a base-64 string to a byte array
base64ToBytes: function(base64) {
// Use browser-native function if it exists
if (typeof atob == "function") return util.stringToBytes(atob(base64));
// Remove non-base-64 characters
base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");
var bytes = [];
for (var i = 0; i < base64.length; i++) {
switch (i % 4) {
case 1:
bytes.push((base64map.indexOf(base64.charAt(i - 1)) << 2) |
(base64map.indexOf(base64.charAt(i)) >>> 4));
break;
case 2:
bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) << 4) |
(base64map.indexOf(base64.charAt(i)) >>> 2));
break;
case 3:
bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) << 6) |
(base64map.indexOf(base64.charAt(i))));
break;
}
}
return bytes;
}
};
// Crypto mode namespace
Crypto.mode = {};
})();
module.exports = Crypto;
//getPolicy.js
const Base64 = require('./Base64.js');
function getPolicyEncode(policy) {
const encodedPolicy = Base64.encode(JSON.stringify(policy));
return encodedPolicy;
}
module.exports = getPolicyEncode;
//GetSignature.js
require('./hmac.js');
require('./sha1.js');
const Crypto = require('./crypto.js');
const Base64 = require('./Base64.js');
//利用SK计算Signature信息
function getSignature(policyEncoded, SecretKey) {
const bytes = Crypto.HMAC(Crypto.SHA1, policyEncoded, SecretKey, {
asBytes: true
});
const signature = Crypto.util.bytesToBase64(bytes);
return signature;
}
module.exports = getSignature;
//hmac.js
/*!
* Crypto-JS v1.1.0
* http://code.google.com/p/crypto-js/
* Copyright (c) 2009, Jeff Mott. All rights reserved.
* http://code.google.com/p/crypto-js/wiki/License
*/
const Crypto = require('./crypto.js');
(function() {
// Shortcut
var util = Crypto.util;
Crypto.HMAC = function(hasher, message, key, options) {
// Allow arbitrary length keys
key = key.length > hasher._blocksize * 4 ?
hasher(key, {
asBytes: true
}) :
util.stringToBytes(key);
// XOR keys with pad constants
var okey = key,
ikey = key.slice(0);
for (var i = 0; i < hasher._blocksize * 4; i++) {
okey[i] ^= 0x5C;
ikey[i] ^= 0x36;
}
var hmacbytes = hasher(util.bytesToString(okey) +
hasher(util.bytesToString(ikey) + message, {
asString: true
}), {
asBytes: true
});
return options && options.asBytes ? hmacbytes :
options && options.asString ? util.bytesToString(hmacbytes) :
util.bytesToHex(hmacbytes);
};
})();
module.exports = Crypto;
//sha1.js
/*!
* Crypto-JS v1.1.0
* http://code.google.com/p/crypto-js/
* Copyright (c) 2009, Jeff Mott. All rights reserved.
* http://code.google.com/p/crypto-js/wiki/License
*/
const Crypto = require('./crypto.js');
(function() {
// Shortcut
var util = Crypto.util;
// Public API
var SHA1 = Crypto.SHA1 = function(message, options) {
var digestbytes = util.wordsToBytes(SHA1._sha1(message));
return options && options.asBytes ? digestbytes :
options && options.asString ? util.bytesToString(digestbytes) :
util.bytesToHex(digestbytes);
};
// The core
SHA1._sha1 = function(message) {
var m = util.stringToWords(message),
l = message.length * 8,
w = [],
H0 = 1732584193,
H1 = -271733879,
H2 = -1732584194,
H3 = 271733878,
H4 = -1009589776;
// Padding
m[l >> 5] |= 0x80 << (24 - l % 32);
m[((l + 64 >>> 9) << 4) + 15] = l;
for (var i = 0; i < m.length; i += 16) {
var a = H0,
b = H1,
c = H2,
d = H3,
e = H4;
for (var j = 0; j < 80; j++) {
if (j < 16) w[j] = m[i + j];
else {
var n = w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16];
w[j] = (n << 1) | (n >>> 31);
}
var t = ((H0 << 5) | (H0 >>> 27)) + H4 + (w[j] >>> 0) + (
j < 20 ? (H1 & H2 | ~H1 & H3) + 1518500249 :
j < 40 ? (H1 ^ H2 ^ H3) + 1859775393 :
j < 60 ? (H1 & H2 | H1 & H3 | H2 & H3) - 1894007588 :
(H1 ^ H2 ^ H3) - 899497514);
H4 = H3;
H3 = H2;
H2 = (H1 << 30) | (H1 >>> 2);
H1 = H0;
H0 = t;
}
H0 += a;
H1 += b;
H2 += c;
H3 += d;
H4 += e;
}
return [H0, H1, H2, H3, H4];
};
// Package private blocksize
SHA1._blocksize = 16;
})();
module.exports = Crypto;
6.在view.vue页面导入计算方法
const getPolicyEncode = require('./OBS/getPolicy.js');
const getSignature = require('./OBS/GetSignature.js');
const Configuration = require('./OBS/Configuration.js');
注意：uniapp ios Android 端如果上传报 403 Crypto.js文件中的 113行文件注释即可
总结
好了，真机运行后成功上传。希望uniapp能过快点支持一下 OBS BrowserJS SDK，否则太麻烦了。 华为云参考链接：support.huaweicloud.com/api-obs/obs… 、support.huaweicloud.com/api-obs/obs… 、 support.huaweicloud.com/intl/zh-cn/…
