mirror of https://github.com/jlelse/GoBlog
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
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package main
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import (
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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geojson "github.com/paulmach/go.geojson"
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"github.com/thoas/go-funk"
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)
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func geoTitle(lat, lon float64) string {
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ba, err := photonReverse(lat, lon)
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if err != nil {
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return ""
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}
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fc, err := geojson.UnmarshalFeatureCollection(ba)
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if err != nil || len(fc.Features) < 1 {
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return ""
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}
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f := fc.Features[0]
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name := f.PropertyMustString("name", "")
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city := f.PropertyMustString("city", "")
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state := f.PropertyMustString("state", "")
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country := f.PropertyMustString("country", "")
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return strings.Join(funk.FilterString([]string{name, city, state, country}, func(s string) bool { return s != "" }), ", ")
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}
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func photonReverse(lat, lon float64) ([]byte, error) {
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cacheKey := fmt.Sprintf("photon-%v-%v", lat, lon)
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cache, _ := retrievePersistentCache(cacheKey)
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if cache != nil {
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return cache, nil
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}
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req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("https://photon.komoot.io/reverse?lat=%v&lon=%v", lat, lon), nil)
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if err != nil {
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return nil, err
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}
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req.Header.Set(userAgent, appUserAgent)
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resp, err := appHttpClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer func() {
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_, _ = io.Copy(io.Discard, resp.Body)
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_ = resp.Body.Close()
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}()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("response status code: %v", resp.StatusCode)
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}
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ba, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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_ = cachePersistently(cacheKey, ba)
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return ba, nil
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}
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