130 lines
2.7 KiB
Go
130 lines
2.7 KiB
Go
package osm
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"strings"
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"time"
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"github.com/melihmucuk/geocache"
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"github.com/photoprism/photoprism/pkg/s2"
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)
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type Location struct {
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ID string `json:"-"`
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PlaceID int `json:"place_id"`
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LocName string `json:"name"`
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LocCategory string `json:"category"`
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LocType string `json:"type"`
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LocDisplayName string `json:"display_name"`
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Address Address `json:"address"`
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Cached bool
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}
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var ReverseLookupURL = "https://nominatim.openstreetmap.org/reverse?lat=%f&lon=%f&format=jsonv2&accept-language=en&zoom=18"
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// API docs see https://wiki.openstreetmap.org/wiki/Nominatim#Reverse_Geocoding
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func FindLocation(id string) (result Location, err error) {
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if len(id) > 16 || len(id) == 0 {
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return result, errors.New("osm: invalid location id")
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}
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lat, lng := s2.LatLng(id)
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if lat == 0.0 || lng == 0.0 {
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return result, fmt.Errorf("osm: skipping lat %f, lng %f", lat, lng)
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}
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point := geocache.GeoPoint{Latitude: lat, Longitude: lng}
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if hit, ok := geoCache.Get(point); ok {
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log.Debugf("osm: cache hit for lat %f, lng %f", lat, lng)
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result = hit.(Location)
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result.Cached = true
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return result, nil
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}
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url := fmt.Sprintf(ReverseLookupURL, lat, lng)
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log.Debugf("osm: query %s", url)
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r, err := http.Get(url)
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if err != nil {
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log.Errorf("osm: %s", err.Error())
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return result, err
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}
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err = json.NewDecoder(r.Body).Decode(&result)
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if err != nil {
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log.Errorf("osm: %s", err.Error())
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return result, err
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}
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if result.PlaceID == 0 {
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result.ID = ""
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return result, fmt.Errorf("osm: no result for %s", id)
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}
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result.ID = id
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geoCache.Set(point, result, time.Hour)
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result.Cached = false
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return result, nil
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}
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func (l Location) CellID() (result string) {
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return l.ID
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}
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func (l Location) State() (result string) {
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result = l.Address.State
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return strings.TrimSpace(result)
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}
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func (l Location) City() (result string) {
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if l.Address.City != "" {
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result = l.Address.City
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} else if l.Address.Town != "" {
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result = l.Address.Town
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} else if l.Address.Village != "" {
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result = l.Address.Village
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} else if l.Address.County != "" {
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result = l.Address.County
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} else if l.Address.State != "" {
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result = l.Address.State
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}
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if len([]rune(result)) > 19 {
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result = ""
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}
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return strings.TrimSpace(result)
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}
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func (l Location) Suburb() (result string) {
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result = l.Address.Suburb
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return strings.TrimSpace(result)
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}
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func (l Location) CountryCode() (result string) {
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result = l.Address.CountryCode
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return strings.ToLower(strings.TrimSpace(result))
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}
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func (l Location) Keywords() (result []string) {
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return result
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}
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func (l Location) Source() string {
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return "osm"
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}
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