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    对象存储(KS3)

    金山云 > 文档中心 > 对象存储(KS3) > SDK

    GO

    最近更新时间：2020-06-22 11:13:21

    KS3 Go SDK使用指南

    目录

    1 概述

    此SDK是基于aws-sdk-go改造，适用于golang 1.8 开发环境。

    2 环境准备

    配置Go 开发环境

    3 初始化

    3.1 下载安装SDK

    go get github.com/ks3sdklib/aws-sdk-go

    3.2 获取密钥

    1、开通KS3服务，http://www.ksyun.com/user/register 注册账号

    2、进入控制台, https://iam.console.ksyun.com/#!/account 获取AccessKeyID 、AccessKeySecret

    3.3 初始化

    1、引用相关包

     import(

 "github.com/ks3sdklib/aws-sdk-go/aws"

 "github.com/ks3sdklib/aws-sdk-go/aws/credentials"

 "github.com/ks3sdklib/aws-sdk-go/service/s3"

 )

    2、初始化客户端

     credentials := credentials.NewStaticCredentials("<AccessKeyID>","<AccessKeySecret>","")

 client := s3.New(&aws.Config{

 Region: "BEIJING",

 Credentials: credentials,

 Endpoint:"ks3-cn-beijing.ksyun.com",//ks3地址

 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

 S3ForcePathStyle:true,//是否强制使用path style方式访问

 LogHTTPBody:true,//是否把HTTP请求body打入日志

 Logger:os.Stdout,//打日志的位置

 })

    注意：

    4 使用示例

    输入参数params和返回结果resp详细结构请参考https://github.com/ks3sdklib/aws-sdk-go/blob/master/service/s3/api.go

    4.1 上传文件

     params := &s3.PutObjectInput{

 Bucket: aws.String("BucketName"), // bucket名称

 Key: aws.String("ObjectKey"), // object key

 ACL: aws.String("ObjectCannedACL"),//权限，支持private(私有)，public-read(公开读)

 Body: bytes.NewReader([]byte("PAYLOAD")),//要上传的内容

 ContentType: aws.String("application/ocet-stream"),//设置content-type

 Metadata: map[string]*string{

 //"Key": aws.String("MetadataValue"), // 设置用户元数据

 // More values...

 },

 }

 resp, err :=svc.PutObjectPresignedUrl(params,time.Second * time.Duration(time.Now().Add(time.Second * 120).Unix()))//第二个参数未外链过期时间，第二个参数为time.Duration类型

 if err!= nil{

 panic(err)

 }

 fmt.Println(resp)

    4.2 下载文件

     params := &s3.GetObjectInput{

 Bucket: aws.String("BucketName"), // bucket名称

 Key: aws.String("ObjectKey"), // object key

 }

 resp, err := client.GetObject(params)

 if err != nil{

 panic(err)

 }

 //读取返回结果中body的前20个字节

 b := make([]byte, 20)

 n, err := resp.Body.Read(b)

 fmt.Printf("%-20s %-2v %v\n", b[:n], n, err)

    4.3 生成文件下载外链

     params := &s3.GetObjectInput{

 Bucket: aws.String("BucketName"), // bucket名称

 Key: aws.String("ObjectKey"), // object key

 ResponseCacheControl: aws.String("ResponseCacheControl"),

//控制返回的Cache-Control header

 ResponseContentDisposition: aws.String("ResponseContentDisposition"),

//控制返回的Content-Disposition header

 ResponseContentEncoding: aws.String("ResponseContentEncoding"),

//控制返回的Content-Encoding header

 ResponseContentLanguage: aws.String("ResponseContentLanguage"),

//控制返回的Content-Language header

 ResponseContentType: aws.String("ResponseContentType"),

//控制返回的Content-Type header

 }

 resp, err := client.GetObjectPresignedUrl(params,1444370289000000000)

//第二个参数为外链过期时间，第二个参数为纳秒级的时间戳

 if err!=nil {

 panic(err)

 }

 fmt.Println(resp)//resp即生成的外链地址,类型为url.URL

    4.4 生成文件上传外链

     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/ocet-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，第二个参数为纳秒级的时间戳

 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/ocet-stream")

 fmt.Println(httpReq)

 httpRep,err := http.DefaultClient.Do(httpReq)

 fmt.Println(httpRep)

 if err != nil{

 panic(err)

 }

    4.5 生成设置文件ACL的外链

     params := &s3.PutObjectACLInput{

 Bucket: aws.String(bucket), // bucket名称

 Key: aws.String(key), // object key

 ACL: aws.String("private"),//设置ACL

 ContentType: aws.String("text/plain"),

 }

 resp, err := client.PutObjectACLPresignedUrl(params,1444370289000000000)

//第二个参数为外链过期时间，第二个参数为纳秒级的时间戳

 if err!=nil {

 panic(err)

 }

 fmt.Println(resp)//resp即生成的外链地址,类型为url.URL

 httpReq, _ := http.NewRequest("PUT", "", nil)

 httpReq.URL = resp

 httpReq.Header["x-amz-acl"] = []string{"private"}

 httpReq.Header.Add("Content-Type","text/plain")

 fmt.Println(httpReq)

 httpRep,err := http.DefaultClient.Do(httpReq)

 if err != nil{

 panic(err)

 }

 fmt.Println(httpRep)

    4.6 初始化分块上传

     params := &s3.CreateMultipartUploadInput{

 Bucket: aws.String("BucketName"), // bucket名称

 Key: aws.String("ObjectKey"), // object key

 ACL: aws.String("ObjectCannedACL"),//权限，支持private(私有)，public-read(公开读)

 ContentType: aws.String("application/ocet-stream"),//设置content-type

 Metadata: map[string]*string{

 //"Key": aws.String("MetadataValue"), // 设置用户元数据

 // More values...

 },

 }

 resp, err := client.CreateMultipartUpload(params)

 if err != nil{

 panic(err)

 }

 //获取这次初始化的uploadid

 fmt.Println(*resp.UploadID)

    4.7 分块上传-上传块

     params := &s3.UploadPartInput{

 Bucket:aws.String(bucket),//bucket名称

 Key:aws.String(key),//文件名

 PartNumber:aws.Long(1),//当前块的序号

 UploadID:aws.String(uploadId),//由初始化获取到得uploadid

 Body:strings.NewReader(content),//当前块的内容

 ContentLength:aws.Long(int64(len(content))),//内容长度

 }

 resp,err := client.UploadPart(params)

 if err != nil{

 panic(err)

 }

 fmt.Println(resp)

    4.8 完成分块上传并合并块

     params := &s3.CompleteMultipartUploadInput{

 Bucket:aws.String(bucket),//bucket名称

 Key:aws.String(key),//文件名

 UploadID:aws.String(uploadId),//由初始化获取到得uploadid

 MultipartUpload:&s3.CompletedMultipartUpload{

 Parts:<已经完成的块列表>,//类型为*s3.CompletedPart数组

 },

 }

 resp,err := client.CompleteMultipartUpload(params)

 if err != nil{

 panic(err)

 }

 fmt.Println(resp)

    4.9 取消分块上传

     params := &s3.AbortMultipartUploadInput{

 Bucket:aws.String(bucket),//bucket名称

 Key:aws.String(key),//文件名

 UploadID:aws.String(uploadId),//由初始化获取到得uploadid

 }

 resp,err := client.AbortMultipartUpload(params)

 if err != nil{

 panic(err)

 }

 fmt.Println(resp)

    4.10 罗列分块上传已经上传的块

     params := &s3.ListPartsInput{

 Bucket:aws.String(bucket),//bucket名称

 Key:aws.String(key),//文件名

 UploadID:aws.String(uploadId),//由初始化获取到得uploadid

 }

 resp,err := client.ListParts(params)

 if err != nil{

 panic(err)

 }

 fmt.Println(resp)

    4.11 计算token（移动端相关）

     package main

 import(

 "crypto/hmac"

 "crypto/sha1"

 "encoding/base64"

 "fmt"

 )

 func main(){

 AccessKeyId := "AccessKeyId"

 AccessKeySecret:= "AccessKeySecret"

 stringToSign := "stringToSign"

 signature := string(base64Encode(makeHmac([]byte(AccessKeySecret), []byte(stringToSign))))

 token := "KSS "+AccessKeyId+":"+signature

 fmt.Println(token)

 }

 func makeHmac(key []byte, data []byte) []byte {

 hash := hmac.New(sha1.New, key)

 hash.Write(data)

 return hash.Sum(nil)

 }

 func base64Encode(src []byte) []byte {

 return []byte(base64.StdEncoding.EncodeToString(src))

 }

    4.12 修改元数据

    func TestModifyObjectMeta(t *testing.T) {
    key_modify_meta := string("yourkey")

    metadata := make(map[string]*string)
    metadata["yourmetakey1"] = aws.String("yourmetavalue1")
    metadata["yourmetakey2"] = aws.String("yourmetavalue2")

    _,err := svc.CopyObject(&s3.CopyObjectInput{
        Bucket:aws.String(bucket),
        Key:aws.String(key_modify_meta),
        CopySource:aws.String("/" + bucket+"/" + key_modify_meta),
        MetadataDirective:aws.String("REPLACE"),
        Metadata:metadata,
    })
    assert.NoError(t,err)
    assert.True(t,objectExists(bucket,key))
}

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