photoprism/internal/meta/json.go

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package meta
import (
"fmt"
"io/ioutil"
"path/filepath"
"reflect"
"strings"
"time"
"github.com/photoprism/photoprism/pkg/txt"
"github.com/tidwall/gjson"
"gopkg.in/ugjka/go-tz.v2/tz"
)
// JSON parses a json sidecar file (as used by Exiftool) and returns a Data struct.
func JSON(fileName string) (data Data, err error) {
err = data.JSON(fileName)
return data, err
}
// JSON parses a json sidecar file (as used by Exiftool) and returns a Data struct.
func (data *Data) JSON(fileName string) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("%s (json metadata)", e)
}
}()
if data.All == nil {
data.All = make(map[string]string)
}
jsonString, err := ioutil.ReadFile(fileName)
if err != nil {
log.Warnf("meta: %s", err.Error())
return fmt.Errorf("can't read %s (json)", txt.Quote(filepath.Base(fileName)))
}
j := gjson.GetBytes(jsonString, "@flatten|@join")
if !j.IsObject() {
return fmt.Errorf("data is not an object in %s (json)", txt.Quote(filepath.Base(fileName)))
}
jsonValues := j.Map()
for key, val := range jsonValues {
data.All[key] = val.String()
}
v := reflect.ValueOf(data).Elem()
// Iterate through all config fields
for i := 0; i < v.NumField(); i++ {
fieldValue := v.Field(i)
tagData := v.Type().Field(i).Tag.Get("meta")
// Automatically assign values to fields with "flag" tag
if tagData != "" {
tagValues := strings.Split(tagData, ",")
var jsonValue gjson.Result
var tagValue string
for _, tagValue = range tagValues {
if r, ok := jsonValues[tagValue]; !ok {
continue
} else {
jsonValue = r
break
}
}
if !jsonValue.Exists() {
continue
}
switch t := fieldValue.Interface().(type) {
case time.Time:
if tv, err := time.Parse("2006:01:02 15:04:05", strings.TrimSpace(jsonValue.String())); err == nil {
fieldValue.Set(reflect.ValueOf(tv.Round(time.Second).UTC()))
}
case time.Duration:
fieldValue.Set(reflect.ValueOf(StringToDuration(jsonValue.String())))
case int, int64:
fieldValue.SetInt(jsonValue.Int())
case float32, float64:
fieldValue.SetFloat(jsonValue.Float())
case uint, uint64:
fieldValue.SetUint(jsonValue.Uint())
case string:
fieldValue.SetString(strings.TrimSpace(jsonValue.String()))
case bool:
fieldValue.SetBool(jsonValue.Bool())
default:
log.Warnf("meta: can't assign value of type %s to %s", t, tagValue)
}
}
}
// Calculate latitude and longitude if exists.
if data.GPSPosition != "" {
data.Lat, data.Lng = GpsToLatLng(data.GPSPosition)
} else if data.GPSLatitude != "" && data.GPSLongitude != "" {
data.Lat = GpsToDecimal(data.GPSLatitude)
data.Lng = GpsToDecimal(data.GPSLongitude)
}
// Set time zone and calculate UTC time.
if data.Lat != 0 && data.Lng != 0 {
zones, err := tz.GetZone(tz.Point{
Lat: float64(data.Lat),
Lon: float64(data.Lng),
})
if err == nil && len(zones) > 0 {
data.TimeZone = zones[0]
}
if !data.TakenAtLocal.IsZero() {
if loc, err := time.LoadLocation(data.TimeZone); err != nil {
log.Warnf("meta: unknown time zone %s", data.TimeZone)
} else if tl, err := time.ParseInLocation("2006:01:02 15:04:05", data.TakenAtLocal.Format("2006:01:02 15:04:05"), loc); err == nil {
data.TakenAt = tl.Round(time.Second).UTC()
} else {
log.Errorf("meta: %s", err.Error()) // this should never happen
}
}
}
// Fix rotation.
if data.Rotation == 90 || data.Rotation == 270 || data.Rotation == -90 {
data.Width, data.Height = data.Height, data.Width
data.Rotation = 0
}
// Normalize compression information.
data.Codec = strings.ToLower(data.Codec)
if strings.Contains(data.Codec, CodecJpeg) {
data.Codec = CodecJpeg
}
return nil
}