上传外链（Go）

以下代码用于生成上传外链：

package ks3test

import (
	"bufio"
	"bytes"
	"github.com/ks3sdklib/aws-sdk-go/aws/awserr"
	"github.com/ks3sdklib/aws-sdk-go/aws/awsutil"
	"net/url"
	"strconv"
	"strings"
	"testing"
	"time"
	//	"io"
	"fmt"
	"github.com/ks3sdklib/aws-sdk-go/aws"
	"github.com/ks3sdklib/aws-sdk-go/aws/credentials"
	"github.com/ks3sdklib/aws-sdk-go/service/s3"
	"net/http"
	"os"
)

var bucket = string("yourbucket")
var key = string("yourkey")
var key_encode = string("yourkey")
var key_copy = string("yourkey")
var content = string("content")
var prefix = "test/" //目录名称

// 金山云主账号 AccessKey 拥有所有API的访问权限，风险很高。
// 强烈建议您创建并使用子账号账号进行 API 访问或日常运维，请登录 https://uc.console.ksyun.com/pro/iam/#/user/list 创建子账号。
// 通过指定 host(Endpoint)，您可以在指定的地域创建新的存储空间。
var cre = credentials.NewStaticCredentials("ak", "sk", "") //online
var svc = s3.New(&aws.Config{
	//Region 可参考 [https://docs.ksyun.com/documents/6761](https://docs.ksyun.com/documents/6761)
	Region:      "BEIJING",
	Credentials: cre,
	//Endpoint 可参考 [https://docs.ksyun.com/documents/6761](https://docs.ksyun.com/documents/6761)
	Endpoint:         "ks3-cn-beijing.ksyuncs.com",
	DisableSSL:       true, //是否禁用https
	LogLevel:         1,    //是否开启日志,0为关闭日志，1为开启日志
	LogHTTPBody:      true, //是否把HTTP请求body打入日志
	Logger:           nil, //打日志的位置
})

//生成上传外链
func TestPutObjectPresignedUrl(t *testing.T) {
         params := &s3.PutObjectInput{
             Bucket: aws.String(bucket), // bucket名称
             Key: aws.String(key), // object key
             ACL: aws.String("public-read"),//设置ACL
             ContentType: aws.String("application/octet-stream"),//设置文件的content-type
             ContentMaxLength: aws.Long(20),//设置允许的最大长度，对应的header：x-amz-content-maxlength
         }
        
         resp, err := client.PutObjectPresignedUrl(params,1444370289000000000)
        //第二个参数为外链过期时间，为纳秒级的时间戳
         if err!=nil {
             panic(err)
         }
        
         httpReq, _ := http.NewRequest("PUT", "", strings.NewReader("123"))
         httpReq.URL = resp
         httpReq.Header["x-amz-acl"] = []string{"public-read"}
         httpReq.Header["x-amz-content-maxlength"] = []string{"20"}
         httpReq.Header.Add("Content-Type","application/octet-stream")
         fmt.Println(httpReq)
         httpRep,err := http.DefaultClient.Do(httpReq)
         fmt.Println(httpRep)
        
         if err != nil{
             panic(err)
         }
}