MaysWind
91 lines
3.9 KiB
Go
91 lines
3.9 KiB
Go
package api
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import (
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"net/http"
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"net/http/httputil"
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"net/url"
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"strings"
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"github.com/mayswind/ezbookkeeping/pkg/core"
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"github.com/mayswind/ezbookkeeping/pkg/errs"
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"github.com/mayswind/ezbookkeeping/pkg/settings"
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)
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const openStreetMapTileImageUrlFormat = "https://tile.openstreetmap.org/{z}/{x}/{y}.png" // https://tile.openstreetmap.org/{z}/{x}/{y}.png
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const openStreetMapHumanitarianStyleTileImageUrlFormat = "https://a.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png" // https://{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png
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const openTopoMapTileImageUrlFormat = "https://tile.opentopomap.org/{z}/{x}/{y}.png" // https://tile.opentopomap.org/{z}/{x}/{y}.png
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const opnvKarteMapTileImageUrlFormat = "https://tileserver.memomaps.de/tilegen/{z}/{x}/{y}.png" // https://tileserver.memomaps.de/tilegen/{z}/{x}/{y}.png
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const cyclOSMMapTileImageUrlFormat = "https://a.tile-cyclosm.openstreetmap.fr/cyclosm/{z}/{x}/{y}.png" // https://{s}.tile-cyclosm.openstreetmap.fr/cyclosm/{z}/{x}/{y}.png
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const cartoDBMapTileImageUrlFormat = "https://a.basemaps.cartocdn.com/rastertiles/voyager/{z}/{x}/{y}{scale}.png" // https://{s}.basemaps.cartocdn.com/{style}/{z}/{x}/{y}{scale}.png
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const tomtomMapTileImageUrlFormat = "https://api.tomtom.com/map/1/tile/basic/main/{z}/{x}/{y}.png" // https://api.tomtom.com/map/{versionNumber}/tile/{layer}/{style}/{z}/{x}/{y}.png?key={key}&language={language}
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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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// MapTileImageProxyHandler returns map tile image
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func (p *MapImageProxy) MapTileImageProxyHandler(c *core.Context) (*httputil.ReverseProxy, *errs.Error) {
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mapProvider := strings.Replace(c.Query("provider"), "-", "_", -1)
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targetUrl := ""
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if mapProvider != settings.Container.Current.MapProvider {
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return nil, errs.ErrMapProviderNotCurrent
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}
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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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fileNameParts := strings.Split(fileName, ".")
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coordinateY := fileNameParts[0]
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scale := c.Query("scale")
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if len(fileNameParts) != 2 || fileNameParts[len(fileNameParts)-1] != "png" {
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return nil, errs.ErrImageExtensionNotSupported
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}
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if mapProvider == settings.OpenStreetMapProvider {
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targetUrl = openStreetMapTileImageUrlFormat
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} else if mapProvider == settings.OpenStreetMapHumanitarianStyleProvider {
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targetUrl = openStreetMapHumanitarianStyleTileImageUrlFormat
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} else if mapProvider == settings.OpenTopoMapProvider {
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targetUrl = openTopoMapTileImageUrlFormat
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} else if mapProvider == settings.OPNVKarteMapProvider {
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targetUrl = opnvKarteMapTileImageUrlFormat
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} else if mapProvider == settings.CyclOSMMapProvider {
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targetUrl = cyclOSMMapTileImageUrlFormat
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} else if mapProvider == settings.CartoDBMapProvider {
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targetUrl = cartoDBMapTileImageUrlFormat
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} else if mapProvider == settings.TomTomMapProvider {
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targetUrl = tomtomMapTileImageUrlFormat + "?key=" + settings.Container.Current.TomTomMapAPIKey
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language := c.Query("language")
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if language != "" {
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targetUrl = targetUrl + "&language=" + language
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}
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} else if mapProvider == settings.CustomProvider {
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targetUrl = settings.Container.Current.CustomMapTileServerUrl
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} else {
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return nil, errs.ErrParameterInvalid
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}
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director := func(req *http.Request) {
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imageRawUrl := targetUrl
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imageRawUrl = strings.Replace(imageRawUrl, "{z}", zoomLevel, -1)
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imageRawUrl = strings.Replace(imageRawUrl, "{x}", coordinateX, -1)
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imageRawUrl = strings.Replace(imageRawUrl, "{y}", coordinateY, -1)
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imageRawUrl = strings.Replace(imageRawUrl, "{scale}", scale, -1)
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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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