携手创作,共同成长!这是我参与「掘金日新计划 · 8 月更文挑战」的第12天,点击查看活动详情
四、改善上传
背景: 采用JS客户端直接签名时,accesskey和密码会暴露在前端页面!这样会存在严重的安全隐患的,所以OSS它也提供了服务端签名直传的方案!
如下图:
服务端签名后直传的原理如下:
- 用户发送policy请求到服务器
- 服务器返回policy和签名给用户
- 用户直接上传数据到OSS
controller
这里定义返回类为R是为了统一返回结果,到后面也会用到
这里的代码源自官网,稍加改动即可
package com.caq.mall.thirdservice.controller;
@RestController
@RequestMapping("oss")
public class OssController {
@Resource
private OSS ossClient;
@Value("${spring.cloud.alicloud.oss.endpoint}")
public String endpoint;
@Value("${spring.cloud.alicloud.oss.bucket}")
public String bucket;
@Value("${spring.cloud.alicloud.access-key}")
public String accessId;
private final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
@GetMapping("/policy")
public R getPolicy(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String host = "https://" + bucket + "." + endpoint; // host的格式为 bucketname.endpoint
// 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信息。
// String callbackUrl = "http://88.88.88.88:8888";
String dir = format.format(new Date())+"/"; // 用户上传文件时指定的前缀。以日期格式存储
// 创建OSSClient实例。
Map<String, String> respMap= null;
try {
long expireTime = 30;
long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
Date expiration = new Date(expireEndTime);
// PostObject请求最大可支持的文件大小为5 GB,即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
PolicyConditions policyConds = new PolicyConditions();
policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);
String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);//生成协议秘钥
byte[] binaryData = postPolicy.getBytes("utf-8");
String encodedPolicy = BinaryUtil.toBase64String(binaryData);
String postSignature = ossClient.calculatePostSignature(postPolicy);
respMap = new LinkedHashMap<String, String>();
respMap.put("accessid", accessId);
respMap.put("policy", encodedPolicy);//生成的协议秘钥
respMap.put("signature", postSignature);
respMap.put("dir", dir);
respMap.put("host", host);
respMap.put("expire", String.valueOf(expireEndTime / 1000));
// respMap.put("expire", formatISO8601Date(expiration));
} catch (Exception e) {
// Assert.fail(e.getMessage());
System.out.println(e.getMessage());
} finally {
ossClient.shutdown();
}
return R.ok().put("data",respMap);
}
}
测试这个请求,http://localhost:9988/oss/policy,成功获取
这里显示的结果为json格式,是因为浏览器装了JSONView插件
插件可以直接从商店下载,直接搜索即可!!!
五、设置网关代理
后面的服务都要加上网关代理,一是为了做跨域处理,二是能做限流、熔断降级等安全措施!
- id: mall-third-service
uri: lb://mall-third-service
predicates:
- Path=/api/thirdservice/**
filters:
- RewritePath= /api/thirdservice/(?<segment>.*),/${segment}
测试这个请求,http://localhost:88/api/thirdservice/oss/policy
至此,我们的功能都没问题了,那么现在就来前端的代码 前端这一部分代码,复制即可我们主要做后端内容!
singleUpload.vue
单文件上传组件
这里我们主要做后断的技术,前端相关的组件直接复制即可
<template>
<div>
<el-upload
action="http://gulimall-hello.oss-cn-beijing.aliyuncs.com"
:data="dataObj"
list-type="picture"
:multiple="false" :show-file-list="showFileList"
:file-list="fileList"
:before-upload="beforeUpload"
:on-remove="handleRemove"
:on-success="handleUploadSuccess"
:on-preview="handlePreview">
<el-button size="small" type="primary">点击上传</el-button>
<div slot="tip" class="el-upload__tip">只能上传jpg/png文件,且不超过10MB</div>
</el-upload>
<el-dialog :visible.sync="dialogVisible">
<img width="100%" :src="fileList[0].url" alt="">
</el-dialog>
</div>
</template>
<script>
import {policy} from './policy'
import { getUUID } from '@/utils'
export default {
name: 'singleUpload',
props: {
value: String
},
computed: {
imageUrl() {
return this.value;
},
imageName() {
if (this.value != null && this.value !== '') {
return this.value.substr(this.value.lastIndexOf("/") + 1);
} else {
return null;
}
},
fileList() {
return [{
name: this.imageName,
url: this.imageUrl
}]
},
showFileList: {
get: function () {
return this.value !== null && this.value !== ''&& this.value!==undefined;
},
set: function (newValue) {
}
}
},
data() {
return {
dataObj: {
policy: '',
signature: '',
key: '',
ossaccessKeyId: '',
dir: '',
host: '',
// callback:'',
},
dialogVisible: false
};
},
methods: {
emitInput(val) {
this.$emit('input', val)
},
handleRemove(file, fileList) {
this.emitInput('');
},
handlePreview(file) {
this.dialogVisible = true;
},
beforeUpload(file) {
let _self = this;
return new Promise((resolve, reject) => {
policy().then(response => {
console.log("响应的数据",response);
_self.dataObj.policy = response.data.policy;
_self.dataObj.signature = response.data.signature;
_self.dataObj.ossaccessKeyId = response.data.accessid;
_self.dataObj.key = response.data.dir +getUUID()+'_${filename}';
_self.dataObj.dir = response.data.dir;
_self.dataObj.host = response.data.host;
console.log("响应的数据222。。。",_self.dataObj);
resolve(true)
}).catch(err => {
reject(false)
})
})
},
handleUploadSuccess(res, file) {
console.log("上传成功...")
this.showFileList = true;
this.fileList.pop();
this.fileList.push({name: file.name, url: this.dataObj.host + '/' + this.dataObj.key.replace("${filename}",file.name) });
this.emitInput(this.fileList[0].url);
}
}
}
</script>
<style>
</style>
multiUpload.vue
多文件上传组件
同上复制即可!!!
<template>
<div>
<el-upload
action="http://gulimall-hello.oss-cn-beijing.aliyuncs.com"
:data="dataObj"
:list-type="listType"
:file-list="fileList"
:before-upload="beforeUpload"
:on-remove="handleRemove"
:on-success="handleUploadSuccess"
:on-preview="handlePreview"
:limit="maxCount"
:on-exceed="handleExceed"
:show-file-list="showFile"
>
<i class="el-icon-plus"></i>
</el-upload>
<el-dialog :visible.sync="dialogVisible">
<img width="100%" :src="dialogImageUrl" alt />
</el-dialog>
</div>
</template>
<script>
import { policy } from "./policy";
import { getUUID } from '@/utils'
export default {
name: "multiUpload",
props: {
//图片属性数组
value: Array,
//最大上传图片数量
maxCount: {
type: Number,
default: 30
},
listType:{
type: String,
default: "picture-card"
},
showFile:{
type: Boolean,
default: true
}
},
data() {
return {
dataObj: {
policy: "",
signature: "",
key: "",
ossaccessKeyId: "",
dir: "",
host: "",
uuid: ""
},
dialogVisible: false,
dialogImageUrl: null
};
},
computed: {
fileList() {
let fileList = [];
for (let i = 0; i < this.value.length; i++) {
fileList.push({ url: this.value[i] });
}
return fileList;
}
},
mounted() {},
methods: {
emitInput(fileList) {
let value = [];
for (let i = 0; i < fileList.length; i++) {
value.push(fileList[i].url);
}
this.$emit("input", value);
},
handleRemove(file, fileList) {
this.emitInput(fileList);
},
handlePreview(file) {
this.dialogVisible = true;
this.dialogImageUrl = file.url;
},
beforeUpload(file) {
let _self = this;
return new Promise((resolve, reject) => {
policy()
.then(response => {
console.log("这是什么${filename}");
_self.dataObj.policy = response.data.policy;
_self.dataObj.signature = response.data.signature;
_self.dataObj.ossaccessKeyId = response.data.accessid;
_self.dataObj.key = response.data.dir +getUUID()+"_${filename}";
_self.dataObj.dir = response.data.dir;
_self.dataObj.host = response.data.host;
resolve(true);
})
.catch(err => {
console.log("出错了...",err)
reject(false);
});
});
},
handleUploadSuccess(res, file) {
this.fileList.push({
name: file.name,
// url: this.dataObj.host + "/" + this.dataObj.dir + "/" + file.name; 替换${filename}为真正的文件名
url: this.dataObj.host + "/" + this.dataObj.key.replace("${filename}",file.name)
});
this.emitInput(this.fileList);
},
handleExceed(files, fileList) {
this.$message({
message: "最多只能上传" + this.maxCount + "张图片",
type: "warning",
duration: 1000
});
}
}
};
</script>
<style>
</style>
policy.js
服务端签名
import http from '@/utils/httpRequest.js'
export function policy() {
return new Promise((resolve,reject)=>{
http({
url: http.adornUrl("/third-party/oss/policy"),
method: "get",
params: http.adornParams({})
}).then(({ data }) => {
resolve(data);
})
});
}
阿里云开启跨域
测试
图片可以正常上传和显示