mirror of https://github.com/jlelse/GoBlog
82 lines
1.8 KiB
Go
82 lines
1.8 KiB
Go
package main
|
|
|
|
import (
|
|
"io"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/go-chi/chi/v5"
|
|
)
|
|
|
|
func (a *goBlog) proxyTiles() http.HandlerFunc {
|
|
tileSource := "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
|
|
if c := a.cfg.MapTiles; c != nil && c.Source != "" {
|
|
tileSource = c.Source
|
|
}
|
|
return func(w http.ResponseWriter, r *http.Request) {
|
|
// Create a new request to proxy to the tile server
|
|
targetUrl := strings.NewReplacer(
|
|
"{s}", chi.URLParam(r, "s"),
|
|
"{z}", chi.URLParam(r, "z"),
|
|
"{x}", chi.URLParam(r, "x"),
|
|
"{y}", chi.URLParam(r, "y"),
|
|
).Replace(tileSource)
|
|
proxyRequest, _ := http.NewRequestWithContext(r.Context(), http.MethodGet, targetUrl, nil)
|
|
// Copy request headers
|
|
for _, k := range []string{
|
|
"Accept-Encoding",
|
|
"Accept-Language",
|
|
"Accept",
|
|
cacheControl,
|
|
"If-Modified-Since",
|
|
"If-None-Match",
|
|
} {
|
|
proxyRequest.Header.Set(k, r.Header.Get(k))
|
|
}
|
|
// Do the request
|
|
res, err := a.httpClient.Do(proxyRequest)
|
|
if err != nil {
|
|
a.serveError(w, r, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
// Copy result headers
|
|
for _, k := range []string{
|
|
"Accept-Ranges",
|
|
"Access-Control-Allow-Origin",
|
|
"Age",
|
|
cacheControl,
|
|
"Content-Length",
|
|
"Content-Type",
|
|
"Etag",
|
|
"Expires",
|
|
} {
|
|
w.Header().Set(k, res.Header.Get(k))
|
|
}
|
|
// Copy result
|
|
w.WriteHeader(res.StatusCode)
|
|
_, _ = io.Copy(w, res.Body)
|
|
_ = res.Body.Close()
|
|
}
|
|
}
|
|
|
|
func (a *goBlog) getMinZoom() int {
|
|
if c := a.cfg.MapTiles; c != nil {
|
|
return c.MinZoom
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (a *goBlog) getMaxZoom() int {
|
|
if c := a.cfg.MapTiles; c != nil && c.MaxZoom > 0 {
|
|
return c.MaxZoom
|
|
}
|
|
return 20
|
|
}
|
|
|
|
func (a *goBlog) getMapAttribution() string {
|
|
if c := a.cfg.MapTiles; c != nil {
|
|
return c.Attribution
|
|
}
|
|
return `© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors`
|
|
}
|