Go言語でs3からファイルダウンロード+プロキシ使う版

s3downloadwithproxy.go

package main

import (
	"net/http"
	"net/url"
	"os"
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/credentials"
	"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"
)

func main() {
	//===== create proxy client
	proxyUrl := "http://hoge.proxy.net:8080"
	httpclient := &http.Client{
		Transport: &http.Transport{
			Proxy: func(*http.Request) (*url.URL, error) {
				return url.Parse(proxyUrl)
			},
		},
	}
	//===== create session on aws
	crds := credentials.NewStaticCredentials("AWS_ACCESS_KEY_ID","AWS_SECRET_ACCESS_KEY","")
	sess := session.Must(session.NewSession(&aws.Config{
				Region: aws.String("ap-northeast-1"),
				HTTPClient: httpclient,
				Credentials: crds,
			}))


	//===== create output file
	outputFile := "./hogefile.gz"
	file, err := os.Create(outputFile)
	if err != nil {
		os.Exit(1)
	}
	defer file.Close()

	//===== download from s3
	downloader := s3manager.NewDownloader(sess)
	_, err = downloader.Download(file, &s3.GetObjectInput{
		Bucket: aws.String("bucket.hoge.fuga.com"),
		Key:    aws.String("hogelog.gz"),
	})
	if err != nil {
		os.Remove(outputFile)
		os.Exit(1)
	}
}
// ref.
// https://gist.github.com/jakexks/2f876697dfca1fe15b92f7bb6032780d
// https://github.com/aws/aws-sdk-go/issues/1226