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package exif
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"os/exec"
"regexp"
"gitlab.com/gitlab-org/labkit/log"
)
var ErrRemovingExif = errors.New("error while removing EXIF")
type cleaner struct {
ctx context.Context
cmd *exec.Cmd
stdout io.Reader
stderr bytes.Buffer
eof bool
}
type FileType int
const (
TypeUnknown FileType = iota
TypeJPEG
TypeTIFF
)
func NewCleaner(ctx context.Context, stdin io.Reader) (io.ReadCloser, error) {
c := &cleaner{ctx: ctx}
if err := c.startProcessing(stdin); err != nil {
return nil, err
}
return c, nil
}
func (c *cleaner) Close() error {
if c.cmd == nil {
return nil
}
return c.cmd.Wait()
}
func (c *cleaner) Read(p []byte) (int, error) {
if c.eof {
return 0, io.EOF
}
n, err := c.stdout.Read(p)
if err == io.EOF {
if waitErr := c.cmd.Wait(); waitErr != nil {
log.WithContextFields(c.ctx, log.Fields{
"command": c.cmd.Args,
"stderr": c.stderr.String(),
"error": waitErr.Error(),
}).Print("exiftool command failed")
return n, ErrRemovingExif
}
c.eof = true
}
return n, err
}
func (c *cleaner) startProcessing(stdin io.Reader) error {
var err error
whitelisted_tags := []string{
"-ResolutionUnit",
"-XResolution",
"-YResolution",
"-YCbCrSubSampling",
"-YCbCrPositioning",
"-BitsPerSample",
"-ImageHeight",
"-ImageWidth",
"-ImageSize",
"-Copyright",
"-CopyrightNotice",
"-Orientation",
}
args := append([]string{"-all=", "--IPTC:all", "--XMP-iptcExt:all", "-tagsFromFile", "@"}, whitelisted_tags...)
args = append(args, "-")
c.cmd = exec.CommandContext(c.ctx, "exiftool", args...)
c.cmd.Stderr = &c.stderr
c.cmd.Stdin = stdin
c.stdout, err = c.cmd.StdoutPipe()
if err != nil {
return fmt.Errorf("failed to create stdout pipe: %v", err)
}
if err = c.cmd.Start(); err != nil {
return fmt.Errorf("start %v: %v", c.cmd.Args, err)
}
return nil
}
func FileTypeFromSuffix(filename string) FileType {
jpegMatch := regexp.MustCompile(`(?i)^[^\n]*\.(jpg|jpeg)$`)
if jpegMatch.MatchString(filename) {
return TypeJPEG
}
tiffMatch := regexp.MustCompile(`(?i)^[^\n]*\.tiff$`)
if tiffMatch.MatchString(filename) {
return TypeTIFF
}
return TypeUnknown
}
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