MaysWind
41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package api
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import (
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"fmt"
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"net/http"
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"net/http/httputil"
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"net/url"
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"github.com/mayswind/ezbookkeeping/pkg/core"
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"github.com/mayswind/ezbookkeeping/pkg/errs"
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)
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const openStreetMapTileImageUrlFormat = "https://tile.openstreetmap.org/%s/%s/%s" // https://tile.openstreetmap.org/{z}/{x}/{y}.png
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// MapImageProxy represents map image proxy
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type MapImageProxy struct {
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}
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// Initialize a map image proxy singleton instance
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var (
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MapImages = &MapImageProxy{}
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)
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// OpenStreetMapTileImageProxyHandler returns open street map tile image
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func (p *MapImageProxy) OpenStreetMapTileImageProxyHandler(c *core.Context) (*httputil.ReverseProxy, *errs.Error) {
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director := func(req *http.Request) {
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zoomLevel := c.Param("zoomLevel")
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coordinateX := c.Param("coordinateX")
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fileName := c.Param("fileName")
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imageRawUrl := fmt.Sprintf(openStreetMapTileImageUrlFormat, zoomLevel, coordinateX, fileName)
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imageUrl, _ := url.Parse(imageRawUrl)
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req.URL = imageUrl
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req.RequestURI = req.URL.RequestURI()
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req.Host = imageUrl.Host
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}
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return &httputil.ReverseProxy{Director: director}, nil
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}
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