213 lines
5.2 KiB
Go
213 lines
5.2 KiB
Go
package scanner
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import (
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"fmt"
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"log"
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"math/big"
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"os"
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"github.com/pkg/errors"
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"gorm.io/gorm"
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"github.com/viktorstrate/photoview/api/graphql/models"
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"github.com/xor-gate/goexif2/exif"
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"github.com/xor-gate/goexif2/mknote"
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)
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func ScanEXIF(tx *gorm.DB, media *models.Media) (returnExif *models.MediaEXIF, returnErr error) {
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log.Printf("Scanning for EXIF")
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{
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// Check if EXIF data already exists
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if media.ExifId != nil {
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var exif models.MediaEXIF
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if err := tx.First(&exif, media.ExifId).Error; err != nil {
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return nil, errors.Wrap(err, "get EXIF for media from database")
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}
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return &exif, nil
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}
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}
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photoFile, err := os.Open(media.Path)
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if err != nil {
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return nil, err
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}
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exif.RegisterParsers(mknote.All...)
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// Recover if exif.Decode panics
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defer func() {
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if err := recover(); err != nil {
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log.Printf("Recovered from panic: Exif decoding: %s\n", err)
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returnErr = errors.New(fmt.Sprintf("Exif decoding panicked: %s\n", err))
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}
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}()
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exifTags, err := exif.Decode(photoFile)
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if err != nil {
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return nil, errors.Wrap(err, "Could not decode EXIF")
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}
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newExif := models.MediaEXIF{}
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model, err := readStringTag(exifTags, exif.Model, media)
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if err == nil {
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newExif.Camera = model
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}
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maker, err := readStringTag(exifTags, exif.Make, media)
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if err == nil {
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newExif.Maker = maker
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}
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lens, err := readStringTag(exifTags, exif.LensModel, media)
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if err == nil {
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newExif.Lens = lens
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}
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date, err := exifTags.DateTime()
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if err == nil {
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newExif.DateShot = &date
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}
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exposure, err := readRationalTag(exifTags, exif.ExposureTime, media)
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if err == nil {
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exposureStr := exposure.RatString()
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newExif.Exposure = &exposureStr
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}
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apertureRat, err := readRationalTag(exifTags, exif.FNumber, media)
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if err == nil {
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aperture, _ := apertureRat.Float64()
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newExif.Aperture = &aperture
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}
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isoTag, err := exifTags.Get(exif.ISOSpeedRatings)
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if err != nil {
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log.Printf("WARN: Could not read ISOSpeedRatings from EXIF: %s\n", media.Title)
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} else {
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iso, err := isoTag.Int(0)
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if err != nil {
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log.Printf("WARN: Could not parse EXIF ISOSpeedRatings as integer: %s\n", media.Title)
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} else {
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newExif.Iso = &iso
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}
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}
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focalLengthTag, err := exifTags.Get(exif.FocalLength)
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if err == nil {
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focalLengthRat, err := focalLengthTag.Rat(0)
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if err == nil {
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focalLength, _ := focalLengthRat.Float64()
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newExif.FocalLength = &focalLength
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} else {
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// For some photos, the focal length cannot be read as a rational value,
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// but is instead the second value read as an integer
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if err == nil {
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focalLength, err := focalLengthTag.Int(1)
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if err != nil {
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log.Printf("WARN: Could not parse EXIF FocalLength as rational or integer: %s\n%s\n", media.Title, err)
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} else {
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focalLenFloat := float64(focalLength)
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newExif.FocalLength = &focalLenFloat
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}
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}
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}
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}
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flash, err := exifTags.Flash()
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if err == nil {
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newExif.Flash = &flash
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}
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orientation, err := readIntegerTag(exifTags, exif.Orientation, media)
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if err == nil {
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newExif.Orientation = orientation
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}
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exposureProgram, err := readIntegerTag(exifTags, exif.ExposureProgram, media)
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if err == nil {
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newExif.ExposureProgram = exposureProgram
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}
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lat, long, err := exifTags.LatLong()
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if err == nil {
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newExif.GPSLatitude = &lat
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newExif.GPSLonitude = &long
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}
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// If exif is empty
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if newExif == (models.MediaEXIF{}) {
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return nil, nil
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}
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// Add EXIF to database and link to media
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if err := tx.Model(&media).Association("Exif").Replace(newExif); err != nil {
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return nil, errors.Wrap(err, "save media exif to database")
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}
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return &newExif, nil
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}
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func readStringTag(tags *exif.Exif, name exif.FieldName, media *models.Media) (*string, error) {
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tag, err := tags.Get(name)
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if err != nil {
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return nil, errors.Wrapf(err, "could not read %s from EXIF: %s", name, media.Title)
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}
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if tag != nil {
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value, err := tag.StringVal()
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if err != nil {
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return nil, errors.Wrapf(err, "could not parse %s from EXIF as string: %s", name, media.Title)
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}
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return &value, nil
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}
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log.Printf("WARN: EXIF tag %s returned null: %s\n", name, media.Title)
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return nil, errors.New("exif tag returned null")
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}
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func readRationalTag(tags *exif.Exif, name exif.FieldName, media *models.Media) (*big.Rat, error) {
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tag, err := tags.Get(name)
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if err != nil {
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return nil, errors.Wrapf(err, "could not read %s from EXIF: %s", name, media.Title)
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}
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if tag != nil {
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value, err := tag.Rat(0)
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if err != nil {
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return nil, errors.Wrapf(err, "could not parse %s from EXIF as rational: %s", name, media.Title)
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}
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return value, nil
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}
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log.Printf("WARN: EXIF tag %s returned null: %s\n", name, media.Title)
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return nil, errors.New("exif tag returned null")
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}
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func readIntegerTag(tags *exif.Exif, name exif.FieldName, media *models.Media) (*int, error) {
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tag, err := tags.Get(name)
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if err != nil {
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return nil, errors.Wrapf(err, "could not read %s from EXIF: %s", name, media.Title)
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}
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if tag != nil {
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value, err := tag.Int(0)
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if err != nil {
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return nil, errors.Wrapf(err, "Could not parse %s from EXIF as integer: %s", name, media.Title)
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}
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return &value, nil
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}
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log.Printf("WARN: EXIF tag %s returned null: %s\n", name, media.Title)
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return nil, errors.New("exif tag returned null")
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}
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