mirror of https://github.com/jlelse/GoBlog
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73 lines
2.2 KiB
73 lines
2.2 KiB
package main
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import (
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"context"
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"embed"
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"encoding/json"
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"fmt"
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"strings"
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gogeouri "git.jlel.se/jlelse/go-geouri"
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"github.com/carlmjohnson/requests"
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geojson "github.com/paulmach/go.geojson"
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"github.com/samber/lo"
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"go.goblog.app/app/pkgs/bufferpool"
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)
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func (a *goBlog) geoTitle(g *gogeouri.Geo, lang string) string {
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if name, ok := g.Parameters["name"]; ok && len(name) > 0 && name[0] != "" {
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return name[0]
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}
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fc, err := a.photonReverse(g.Latitude, g.Longitude, lang)
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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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return strings.Join(lo.Filter([]string{
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f.PropertyMustString("name", ""), f.PropertyMustString("city", ""), f.PropertyMustString("state", ""), f.PropertyMustString("country", ""),
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}, func(s string, _ int) bool { return s != "" }), ", ")
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}
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func (a *goBlog) photonReverse(lat, lon float64, lang string) (*geojson.FeatureCollection, error) {
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// Only allow one concurrent request
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a.photonMutex.Lock()
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defer a.photonMutex.Unlock()
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// Create feature collection
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fc := geojson.NewFeatureCollection()
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// Check cache
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cacheKey := fmt.Sprintf("photon-%v-%v-%v", lat, lon, lang)
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if cache, _ := a.db.retrievePersistentCache(cacheKey); cache != nil {
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// Cache hit, unmarshal and return
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if err := json.Unmarshal(cache, fc); err != nil {
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return nil, err
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}
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return fc, nil
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}
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// No cache, fetch from Photon
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buf := bufferpool.Get()
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defer bufferpool.Put(buf)
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// Create request
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rb := requests.URL("https://photon.komoot.io/reverse").Client(a.httpClient).ToBytesBuffer(buf)
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// Set parameters
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rb.Param("lat", fmt.Sprintf("%v", lat)).Param("lon", fmt.Sprintf("%v", lon))
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rb.Param("lang", lo.If(lang == "de" || lang == "fr" || lang == "it", lang).Else("en")) // Photon only supports en, de, fr, it
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// Do request
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if err := rb.Fetch(context.Background()); err != nil {
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return nil, err
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}
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// Cache response
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_ = a.db.cachePersistently(cacheKey, buf.Bytes())
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// Unmarshal response
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if err := json.NewDecoder(buf).Decode(fc); err != nil {
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return nil, err
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}
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return fc, nil
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}
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func geoOSMLink(g *gogeouri.Geo) string {
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return fmt.Sprintf("https://www.openstreetmap.org/?mlat=%v&mlon=%v", g.Latitude, g.Longitude)
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}
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//go:embed leaflet/*
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var leafletFiles embed.FS
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