目前cos现网支持V4签名，所以之前由于V4签名被卡掉的awssdk现在都可以兼容cos了。
在这里提供一份aws-go-sdk兼容cos的使用指南
如何通过aws的 gosdk调用cos的服务

1、安装go并配置环境

2、下载并安装aws-go-sdk

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

3、通过sdk使用cos具体示例

• 注意!!!：请将<seceretid>、<secretkey>、<bucketname>和<appip>、<region>分别替换为真实的信息

可能涉及到的库

package main

import (
    "bufio"
    "fmt"
    "os"
    "strings"
    "bytes"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/aws/endpoints"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/s3"
    "github.com/aws/aws-sdk-go/service/s3/s3manager"
)

创建client

myCustomResolver := func(service, region string, optFns ...func(*endpoints.Options)) (endpoints.ResolvedEndpoint, error) {
    if service == endpoints.S3ServiceID {
        return endpoints.ResolvedEndpoint{
            URL:           "http://cos.<region>.myqcloud.com",
            SigningRegion: "<region>",
        }, nil
    }
    return endpoints.DefaultResolver().EndpointFor(service, region, optFns...)
}
creds := credentials.NewStaticCredentials("<seceretid>", "<secretkey>", "")

sess := session.Must(session.NewSession(&aws.Config{
    Credentials:      creds,
    Region:           aws.String("<region>"),
    EndpointResolver: endpoints.ResolverFunc(myCustomResolver),
}))
bucket := aws.String("<bucketname>-<appid>”)
svc := s3.New(sess)

创建bucket

//create bucket
input0 := &s3.CreateBucketInput{
    Bucket: bucket,
}
result0, err0 := svc.CreateBucket(input0)
fmt.Println(result0)
fmt.Println(err0)

上传文件(文件大于分块时，使用分块上传)

f, err := os.Open(local_path)
if err != nil {
    fmt.Println("failed to open file")os
    return
}
upParams := &s3manager.UploadInput{
    Bucket: bucket,
    Key:    aws.String("exampleobject"),
    Body:   f,
}
uploader := s3manager.NewUploaderWithClient(svc)
result1, err1 := uploader.Upload(upParams, func(u *s3manager.Uploader) {
    u.PartSize = 1024 * 1024 * 5 // 5MB part size
    u.LeavePartsOnError = true   // Don't delete the parts if the upload fails.
})
fmt.Println(result1)
fmt.Println(err1)

上传文件

//put object
input2 := &s3.PutObjectInput{
    Body:   aws.ReadSeekCloser(strings.NewReader("helloworld.go.exe")),
    Bucket: bucket,
    Key:    aws.String("exampleobject"),
}
result2, err2 := svc.PutObject(input2)
fmt.Println(result2)
fmt.Println(err2)

下载文件

//get object
input3 := &s3.GetObjectInput{
    Bucket: bucket,
    Key:    aws.String("exampleobject"),
}
result3, err3 := svc.GetObject(input3)
fmt.Println(result3)
fmt.Println(err3)

删除文件

//delete object
input4 := &s3.DeleteObjectInput{
    Bucket: bucket,
    Key:    aws.String("exampleobject"),
}
result4, err4 := svc.DeleteObject(input4)
fmt.Println(result4)
fmt.Println(err4)

删除bucket

//delete bucket
input5 := &s3.DeleteBucketInput{
    Bucket: bucket,
}
result5, err5 := svc.DeleteBucket(input5)
fmt.Println(result5)
fmt.Println(err5)

查看bucket

//head bucket
input6 := &s3.HeadBucketInput{
    Bucket: bucket,
}
result6, err6 := svc.HeadBucket(input6)
fmt.Println(result6)
fmt.Println(err6)

查看文件

//head object
input7 := &s3.HeadObjectInput{
    Bucket: bucket,
    Key:    aws.String("exampleobject"),
}
result7, err7 := svc.HeadObject(input7)
fmt.Println(result7)
fmt.Println(err7)

查看文件列表

//list objects
input8 := &s3.ListObjectsInput{
    Bucket: bucket,
}
result8, err8 := svc.ListObjects(input8)
fmt.Println(result8)
fmt.Println(err8)

更多详细使用请参照awsgosdk s3文档

• https://docs.aws.amazon.com/sdk-for-go/api/service/s3/