/
main.go
84 lines (72 loc) · 1.92 KB
/
main.go
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package main
import (
"encoding/base64"
"errors"
"flag"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ecr"
"os"
"strings"
)
func main() {
var region string
var helpShort, helpLong bool
flags := flag.NewFlagSet("ecr-get-login", flag.ContinueOnError)
flags.StringVar(®ion, "region", "", "Connect to this AWS region.")
flags.BoolVar(&helpShort, "h", false, "Display usage.")
flags.BoolVar(&helpLong, "help", false, "Display usage.")
err := flags.Parse(os.Args[1:])
if helpShort || helpLong {
usage()
os.Exit(0)
} else if err != nil || flags.NArg() == 0 {
usage()
os.Exit(1)
}
if region == "" {
region = os.Getenv("AWS_REGION")
}
if err := login(region, flags.Args()); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(1)
}
}
func usage() {
fmt.Fprintln(os.Stderr, "Retrieve ECR Docker login credentials.")
fmt.Fprintln(os.Stderr, "usage: ecr-get-login [-region=REGION] ACCOUNT...")
}
// Log Docker into the ECR accounts in the given region.
func login(region string, accounts []string) error {
svc := ecr.New(session.New(), &aws.Config{
Region: aws.String(region),
})
res, err := svc.GetAuthorizationToken(&ecr.GetAuthorizationTokenInput{
RegistryIds: aws.StringSlice(accounts),
})
if err != nil {
return err
}
format := "docker login -u AWS -p %s %s\n"
for _, data := range res.AuthorizationData {
password, err := decodeAuth(aws.StringValue(data.AuthorizationToken))
if err != nil {
return nil
}
fmt.Printf(format, password, aws.StringValue(data.ProxyEndpoint))
}
return nil
}
// Decode the base64 auth string.
func decodeAuth(auth string) (string, error) {
decoded, err := base64.StdEncoding.DecodeString(auth)
if err != nil {
return "", err
}
parts := strings.SplitN(string(decoded), ":", 2)
if len(parts) != 2 {
return "", errors.New("auth data contains invalid payload")
}
return parts[1], nil
}