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analyser.go
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/
analyser.go
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package analyser
import (
"crypto/sha256"
"github.com/thomasduchatelle/dphoto/delegate/backup/backupmodel"
"github.com/thomasduchatelle/dphoto/delegate/backup/interactors"
"encoding/hex"
"fmt"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"hash"
"io"
"io/ioutil"
"path"
"reflect"
"regexp"
"strings"
"time"
)
var SupportedExtensions = map[string]backupmodel.MediaType{
"jpg": backupmodel.MediaTypeImage,
"jpeg": backupmodel.MediaTypeImage,
"png": backupmodel.MediaTypeImage,
"gif": backupmodel.MediaTypeImage,
"webp": backupmodel.MediaTypeImage,
"raw": backupmodel.MediaTypeImage,
//"bmp": backupmodel.MediaTypeImage,
"svg": backupmodel.MediaTypeImage,
"eps": backupmodel.MediaTypeImage,
"mkv": backupmodel.MediaTypeVideo,
"mts": backupmodel.MediaTypeVideo,
"avi": backupmodel.MediaTypeVideo,
"mp4": backupmodel.MediaTypeVideo,
"mpeg": backupmodel.MediaTypeVideo,
"mov": backupmodel.MediaTypeVideo,
"wmv": backupmodel.MediaTypeVideo,
"webm": backupmodel.MediaTypeVideo,
}
var DefaultMediaTimestamp = true // DefaultMediaTimestamp set to TRUE will use file last modification date as its timestamp when it can't be found within the file.
func AnalyseMedia(found backupmodel.FoundMedia) (*backupmodel.AnalysedMedia, error) {
reader, hasher, err := readerSpyingForHash(found)
defer reader.Close()
mediaType, details, err := extractDetails(found, backupmodel.DetailsReaderOptions{}, func() (io.ReadCloser, error) {
return reader, nil
})
if err != nil {
return nil, err
}
fileHash, err := hasher.computeHash()
return &backupmodel.AnalysedMedia{
FoundMedia: found,
Type: mediaType,
Signature: &backupmodel.FullMediaSignature{
Sha256: fileHash,
Size: found.SimpleSignature().Size,
},
Details: details,
}, errors.Wrapf(err, "failed to compute HASH of media %s", found)
}
func ExtractTypeAndDetails(found backupmodel.FoundMedia) (backupmodel.MediaType, *backupmodel.MediaDetails, error) {
media, err := found.ReadMedia()
if err != nil {
return "", nil, err
}
defer media.Close()
return extractDetails(found, backupmodel.DetailsReaderOptions{Fast: true}, func() (io.ReadCloser, error) {
return media, err
})
}
func extractDetails(found backupmodel.FoundMedia, options backupmodel.DetailsReaderOptions, readMedia func() (io.ReadCloser, error)) (backupmodel.MediaType, *backupmodel.MediaDetails, error) {
mediaType := getMediaType(found)
details := &backupmodel.MediaDetails{}
var matchingReaders []string
for _, detailsReader := range interactors.DetailsReaders {
if detailsReader.Supports(found, mediaType) {
matchingReaders = append(matchingReaders, getType(detailsReader))
reader, err := readMedia()
if err != nil {
return mediaType, nil, errors.Wrapf(err, "failed to open media %s for analyse", found)
}
details, err = detailsReader.ReadDetails(reader, options)
if err != nil {
return mediaType, nil, errors.Wrapf(err, "failed to analyse %s", found)
}
}
}
if details.DateTime.IsZero() {
log.WithField("Media", found).Warnf("Modification date not found with readers: %s", strings.Join(matchingReaders, ", "))
if DefaultMediaTimestamp {
details.DateTime = extractFromFileName(found.MediaPath().Filename, found.LastModificationDate())
}
}
return mediaType, details, nil
}
func extractFromFileName(filename string, defaultDate time.Time) time.Time {
formats := []struct {
Regex string
Layout string
RemoveNonNumeric bool
}{
{"(199[0-9]|20[012][0-9])[^0-9A-Za-z]?[01][^0-9A-Za-z]?[0-9][^0-9A-Za-z]?[0-3][0-9][^0-9]?[0-2][0-9][^0-9A-Za-z]?[0-6][0-9][^0-9A-Za-z]?[0-6][0-9]", "20060102150405", true},
{"(199[0-9]|20[012][0-9])[^0-9A-Za-z]?[01][^0-9A-Za-z]?[0-9][^0-9A-Za-z]?[0-3][0-9]", "20060102", true},
}
for _, f := range formats {
date := regexp.MustCompile(f.Regex).FindString(filename)
if f.RemoveNonNumeric {
date = regexp.MustCompile("[^0-9]").ReplaceAllLiteralString(date, "")
}
if date != "" {
parsedDate, err := time.Parse(f.Layout, date)
if err == nil && !parsedDate.IsZero() && parsedDate.Before(time.Now()) && parsedDate.After(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)){
return parsedDate
}
}
}
return defaultDate
}
type hashSpy struct {
reader io.Reader
shaWriter hash.Hash
cachedHash string
}
type teeCloser struct {
io.Reader
io.Closer
}
func readerSpyingForHash(found backupmodel.FoundMedia) (io.ReadCloser, *hashSpy, error) {
reader, err := found.ReadMedia()
if mediaWithHash, ok := found.(backupmodel.FoundMediaWithHash); ok {
return reader, &hashSpy{cachedHash: mediaWithHash.Sha256Hash()}, err
}
shaWriter := sha256.New()
teeReader := io.TeeReader(reader, shaWriter)
return teeCloser{Reader: teeReader, Closer: reader}, &hashSpy{
reader: teeReader,
shaWriter: shaWriter,
}, err
}
func (r *hashSpy) computeHash() (string, error) {
if r.cachedHash != "" {
return r.cachedHash, nil
}
_, err := io.Copy(ioutil.Discard, r.reader)
return hex.EncodeToString(r.shaWriter.Sum(nil)), err
}
func getMediaType(media backupmodel.FoundMedia) backupmodel.MediaType {
extension := strings.TrimPrefix(strings.ToLower(path.Ext(media.MediaPath().Filename)), ".")
if t, ok := SupportedExtensions[extension]; ok {
return t
}
return backupmodel.MediaTypeOther
}
func getType(myvar interface{}) (res string) {
t := reflect.TypeOf(myvar)
for t.Kind() == reflect.Ptr {
t = t.Elem()
res += "*"
}
return fmt.Sprintf("%s%s/%s", res, t.PkgPath(), t.Name())
}