308 lines
6.7 KiB
Go
308 lines
6.7 KiB
Go
package meta
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import (
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"fmt"
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"math"
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"path"
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"strconv"
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"strings"
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"time"
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"github.com/dsoprea/go-exif/v2"
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"github.com/dsoprea/go-exif/v2/common"
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"github.com/dsoprea/go-jpeg-image-structure"
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"github.com/dsoprea/go-png-image-structure"
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"gopkg.in/ugjka/go-tz.v2/tz"
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)
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// SanitizeString removes unwanted character from an exif value string.
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func SanitizeString(value string) string {
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return strings.Replace(value, "\"", "", -1)
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}
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// Exif parses an image file for Exif meta data and returns as Data struct.
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func Exif(filename string) (data Data, err error) {
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defer func() {
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if e := recover(); e != nil {
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data = Data{}
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err = fmt.Errorf("meta: %s", e)
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}
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}()
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// Extract raw EXIF block.
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var rawExif []byte
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fileExtension := path.Ext(filename)
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fileExtension = strings.ToLower(fileExtension)
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if fileExtension == ".jpg" || fileExtension == ".jpeg" {
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jmp := jpegstructure.NewJpegMediaParser()
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sl, err := jmp.ParseFile(filename)
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if err != nil {
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return data, err
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}
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_, rawExif, err = sl.Exif()
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if err != nil {
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return data, err
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}
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} else if fileExtension == ".png" {
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pmp := pngstructure.NewPngMediaParser()
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cs, err := pmp.ParseFile(filename)
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if err != nil {
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return data, err
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}
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_, rawExif, err = cs.Exif()
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if err != nil {
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return data, err
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}
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} else {
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// Fallback to an optimistic, brute-force search.
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var err error
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rawExif, err = exif.SearchFileAndExtractExif(filename)
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if err != nil {
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return data, err
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}
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}
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// Enumerate tags in EXIF block.
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ti := exif.NewTagIndex()
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if err := exif.LoadStandardTags(ti); err != nil {
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return data, err
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}
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tags := make(map[string]string)
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visitor := func(fqIfdPath string, ifdIndex int, ite *exif.IfdTagEntry) (err error) {
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tagId := ite.TagId()
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tagType := ite.TagType()
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ifdPath, err := im.StripPathPhraseIndices(fqIfdPath)
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if err != nil {
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return nil
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}
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it, err := ti.Get(ifdPath, tagId)
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if err != nil {
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return nil
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}
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valueString := ""
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if tagType != exifcommon.TypeUndefined {
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valueString, err = ite.FormatFirst()
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if err != nil {
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log.Errorf("exif: %s", err.Error())
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return nil
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}
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if it.Name != "" && valueString != "" {
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tags[it.Name] = strings.Split(valueString, "\x00")[0]
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}
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}
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return nil
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}
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_, err = exif.Visit(exifcommon.IfdStandard, im, ti, rawExif, visitor)
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if err != nil {
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return data, err
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}
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// Cherry-pick the values that we care about.
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if value, ok := tags["Artist"]; ok {
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data.Artist = SanitizeString(value)
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}
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if value, ok := tags["Copyright"]; ok {
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data.Copyright = SanitizeString(value)
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}
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if value, ok := tags["Model"]; ok {
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data.CameraModel = SanitizeString(value)
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}
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if value, ok := tags["Make"]; ok {
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data.CameraMake = SanitizeString(value)
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}
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if value, ok := tags["CameraOwnerName"]; ok {
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data.CameraOwner = SanitizeString(value)
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}
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if value, ok := tags["BodySerialNumber"]; ok {
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data.CameraSerial = SanitizeString(value)
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}
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if value, ok := tags["LensMake"]; ok {
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data.LensMake = SanitizeString(value)
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}
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if value, ok := tags["LensModel"]; ok {
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data.LensModel = SanitizeString(value)
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}
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if value, ok := tags["ExposureTime"]; ok {
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if n := strings.Split(value, "/"); len(n) == 2 {
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if n[0] != "1" && len(n[0]) < len(n[1]) {
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n0, _ := strconv.ParseUint(n[0], 10, 64)
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if n1, err := strconv.ParseUint(n[1], 10, 64); err == nil && n0 > 0 && n1 > 0 {
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value = fmt.Sprintf("1/%d", n1/n0)
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}
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}
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}
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data.Exposure = value
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}
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if value, ok := tags["FNumber"]; ok {
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values := strings.Split(value, "/")
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if len(values) == 2 && values[1] != "0" && values[1] != "" {
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number, _ := strconv.ParseFloat(values[0], 64)
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denom, _ := strconv.ParseFloat(values[1], 64)
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data.FNumber = float32(math.Round((number/denom)*1000) / 1000)
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}
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}
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if value, ok := tags["ApertureValue"]; ok {
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values := strings.Split(value, "/")
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if len(values) == 2 && values[1] != "0" && values[1] != "" {
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number, _ := strconv.ParseFloat(values[0], 64)
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denom, _ := strconv.ParseFloat(values[1], 64)
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data.Aperture = float32(math.Round((number/denom)*1000) / 1000)
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}
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}
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if value, ok := tags["FocalLengthIn35mmFilm"]; ok {
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if i, err := strconv.Atoi(value); err == nil {
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data.FocalLength = i
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}
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} else if value, ok := tags["FocalLength"]; ok {
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values := strings.Split(value, "/")
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if len(values) == 2 && values[1] != "0" && values[1] != "" {
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number, _ := strconv.ParseFloat(values[0], 64)
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denom, _ := strconv.ParseFloat(values[1], 64)
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data.FocalLength = int(math.Round((number/denom)*1000) / 1000)
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}
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}
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if value, ok := tags["ISOSpeedRatings"]; ok {
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if i, err := strconv.Atoi(value); err == nil {
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data.Iso = i
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}
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}
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if value, ok := tags["ImageUniqueID"]; ok {
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data.UniqueID = value
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}
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if value, ok := tags["ImageWidth"]; ok {
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if i, err := strconv.Atoi(value); err == nil {
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data.Width = i
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}
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} else if value, ok := tags["PixelXDimension"]; ok {
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if i, err := strconv.Atoi(value); err == nil {
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data.Width = i
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}
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}
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if value, ok := tags["ImageLength"]; ok {
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if i, err := strconv.Atoi(value); err == nil {
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data.Height = i
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}
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} else if value, ok := tags["PixelYDimension"]; ok {
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if i, err := strconv.Atoi(value); err == nil {
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data.Height = i
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}
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}
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if value, ok := tags["Orientation"]; ok {
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if i, err := strconv.Atoi(value); err == nil {
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data.Orientation = i
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}
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} else {
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data.Orientation = 1
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}
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_, index, err := exif.Collect(im, ti, rawExif)
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if err != nil {
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return data, err
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}
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if ifd, err := index.RootIfd.ChildWithIfdPath(exifcommon.IfdPathStandardGps); err == nil {
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if gi, err := ifd.GpsInfo(); err == nil {
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data.Lat = float32(gi.Latitude.Decimal())
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data.Lng = float32(gi.Longitude.Decimal())
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data.Altitude = gi.Altitude
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}
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}
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if data.Lat != 0 && data.Lng != 0 {
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zones, err := tz.GetZone(tz.Point{
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Lat: float64(data.Lat),
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Lon: float64(data.Lng),
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})
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if err == nil && len(zones) > 0 {
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data.TimeZone = zones[0]
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}
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}
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if value, ok := tags["DateTimeOriginal"]; ok && value != "0000:00:00 00:00:00" {
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if taken, err := time.Parse("2006:01:02 15:04:05", value); err == nil {
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data.TakenAtLocal = taken.Round(time.Second)
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data.TakenAt = data.TakenAtLocal
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if loc, err := time.LoadLocation(data.TimeZone); err != nil {
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log.Warnf("exif: unknown time zone %s", data.TimeZone)
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} else if tl, err := time.ParseInLocation("2006:01:02 15:04:05", value, loc); err == nil {
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data.TakenAt = tl.Round(time.Second).UTC()
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} else {
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log.Errorf("exif: %s", err.Error()) // this should never happen
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}
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} else {
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log.Warnf("exif: invalid time %s", value)
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}
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}
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if value, ok := tags["Flash"]; ok {
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if i, err := strconv.Atoi(value); err == nil && i&1 == 1 {
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data.Flash = true
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}
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}
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if value, ok := tags["ImageDescription"]; ok {
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data.Description = SanitizeString(value)
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}
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data.All = tags
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return data, nil
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}
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