服务端签名后上传图片-阿里云开发者社区

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

服务端签名后上传图片

controller

singleUpload.vue

multiUpload.vue

policy.js

阿里云开启跨域

测试

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