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cli.go
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cli.go
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package cli
import (
"fmt"
"io"
"os"
"github.com/pkg/errors"
flag "github.com/spf13/pflag"
"github.com/dtan4/s3url/aws"
"github.com/dtan4/s3url/config"
)
const (
exitCodeOK int = iota
exitCodeError
)
const usage = `Usage of %s:
%s https://s3-region.amazonaws.com/BUCKET/KEY [-d DURATION]
%s s3://BUCKET/KEY [-d DURATION]
%s -b BUCKET -k KEY [-d DURATION]
Options:
`
// CLI represent CLI implementation
type CLI struct {
stdout io.Writer
stderr io.Writer
version string
commit string
buildAt string
}
// New returns new CLI object
func New(stdout, stderr io.Writer, version, commit, buildAt string) *CLI {
return &CLI{
stdout: stdout,
stderr: stderr,
version: version,
commit: commit,
buildAt: buildAt,
}
}
// Run executes s3url command process
func (cli *CLI) Run(args []string) int {
f := flag.NewFlagSet("s3url", flag.ExitOnError)
f.Usage = func() {
fmt.Fprintf(cli.stderr, usage, args[0], args[0], args[0], args[0])
f.PrintDefaults()
}
c := config.Config{}
f.StringVarP(&c.Bucket, "bucket", "b", "", "Bucket name")
f.BoolVar(&c.Debug, "debug", false, "Enable debug output")
f.Int64VarP(&c.Duration, "duration", "d", config.DefaultDuration, "Valid duration in minutes")
f.StringVarP(&c.Key, "key", "k", "", "Object key")
f.StringVar(&c.Profile, "profile", "", "AWS profile name")
f.StringVar(&c.Upload, "upload", "", "File to upload")
f.BoolVarP(&c.Version, "version", "v", false, "Print version")
f.Parse(args[1:])
if c.Version {
cli.printVersion()
return exitCodeOK
}
var s3URL string
for 0 < f.NArg() {
s3URL = f.Args()[0]
f.Parse(f.Args()[1:])
}
if s3URL == "" && (c.Bucket == "" || c.Key == "") {
f.Usage()
return exitCodeError
}
if s3URL != "" {
if err := c.ParseS3URL(s3URL); err != nil {
cli.printError(err, c.Debug)
return exitCodeError
}
}
if err := c.Validate(); err != nil {
cli.printError(err, c.Debug)
return exitCodeError
}
if err := aws.Initialize(c.Profile); err != nil {
cli.printError(err, c.Debug)
return exitCodeError
}
if c.Upload != "" {
if err := cli.uploadFile(c.Bucket, c.Key, c.Upload); err != nil {
cli.printError(err, c.Debug)
return exitCodeError
}
fmt.Fprintln(cli.stderr, "uploaded: "+c.Upload)
}
signedURL, err := aws.S3.GetPresignedURL(c.Bucket, c.Key, c.Duration)
if err != nil {
cli.printError(err, c.Debug)
return exitCodeError
}
fmt.Fprintln(cli.stdout, signedURL)
return exitCodeOK
}
func (cli *CLI) uploadFile(bucket, key, filename string) error {
f, err := os.Open(filename)
if err != nil {
return errors.Wrapf(err, "cannot open %q", filename)
}
defer f.Close()
if err := aws.S3.UploadToS3(bucket, key, f); err != nil {
return errors.Wrapf(err, "cannot uplaod %q to S3", filename)
}
return nil
}
func (cli *CLI) printError(err error, debug bool) {
if debug {
fmt.Fprintf(cli.stderr, "%+v\n", err)
} else {
fmt.Fprintln(cli.stderr, err)
}
}
func (cli *CLI) printVersion() {
fmt.Fprintf(cli.stdout, "s3url version: %s, commit: %s, build at: %s\n", cli.version, cli.commit, cli.buildAt)
}