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exif.go
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exif.go
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// Copyright © 2018 Christoph Petrausch
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package extraction
import (
"fmt"
"time"
"os"
"github.com/pkg/errors"
"github.com/xor-gate/goexif2/exif"
"github.com/xor-gate/goexif2/mknote"
)
const (
// dateAndTime = "Date and Time"
// dateAndTimeDigitized = "Date and Time (Digitized)"
// dateAndTimeOriginial = "Date and Time (Original)"
// timeFormat = "2006:01:02 15:04:05"
noInfoFoundError = "could neither read exif meta data nor file modification time"
)
func init() {
exif.RegisterParsers(mknote.All...)
}
// CaptureDate returns the point in time the capturing device created the media file
func CaptureDate(fname string) (retTime time.Time, retErr error) {
defer func() {
r := recover()
if r != nil {
retTime = time.Time{}
retErr = fmt.Errorf("catched panic while processing file (%s): %v", fname, r)
}
}()
fInfo, fInfoErr := os.Stat(fname)
f, err := os.Open(fname)
if err != nil {
if fInfoErr == nil {
return fInfo.ModTime(), nil
}
return time.Time{}, errors.Wrap(err, "failed to open or fstat file.")
}
x, err := exif.Decode(f)
//data, err := exif.Read(fname)
if err != nil {
if fInfoErr == nil {
return fInfo.ModTime(), nil
}
return time.Time{}, errors.Wrap(err, noInfoFoundError)
}
tm, err := x.DateTime()
if err != nil {
if fInfoErr == nil {
return fInfo.ModTime(), nil
}
return time.Time{}, errors.Wrap(err, noInfoFoundError)
}
return tm, nil
}