Sumner Evans
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
package msgconv
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import (
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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)
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type GeoURI struct {
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Lat float64
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Long float64
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}
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var _ json.Unmarshaler = (*GeoURI)(nil)
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var _ json.Marshaler = (*GeoURI)(nil)
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func GeoURIFromLatLong(lat, long float64) GeoURI {
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return GeoURI{lat, long}
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}
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func ParseGeoURI(uri string) (g GeoURI, err error) {
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if !strings.HasPrefix(uri, "geo:") {
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return g, fmt.Errorf("invalid geo URI: %s", uri)
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}
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coordinates := strings.Split(strings.TrimPrefix(uri, "geo:"), ";")[0]
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parts := strings.Split(coordinates, ",")
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if len(parts) != 2 {
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return g, fmt.Errorf("geo coordinates not formatted properly")
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}
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g.Lat, err = strconv.ParseFloat(parts[0], 64)
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if err != nil {
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return g, fmt.Errorf("failed to parse latitude: %w", err)
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}
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g.Long, err = strconv.ParseFloat(parts[1], 64)
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if err != nil {
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return g, fmt.Errorf("failed to parse longitude: %w", err)
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}
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return
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}
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func (g GeoURI) URI() string {
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return fmt.Sprintf("geo:%f,%f", g.Lat, g.Long)
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}
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func (g *GeoURI) UnmarshalJSON(data []byte) (err error) {
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var uri string
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err = json.Unmarshal(data, &uri)
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if err != nil {
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return err
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}
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geo, err := ParseGeoURI(uri)
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g.Lat = geo.Lat
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g.Long = geo.Long
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return
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}
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func (g *GeoURI) MarshalJSON() ([]byte, error) {
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return json.Marshal(g.URI())
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}
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