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build_dev.go
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build_dev.go
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//go:build !production
package assetserver
import (
_ "embed"
"io/fs"
"net/http"
"net/http/httputil"
"net/url"
"os"
)
//go:embed defaultindex.html
var defaultHTML []byte
func defaultIndexHTML() []byte {
return defaultHTML
}
func NewAssetFileServer(vfs fs.FS) http.Handler {
devServerURL := GetDevServerURL()
if devServerURL == "" {
return newAssetFileServerFS(vfs)
}
parsedURL, err := url.Parse(devServerURL)
if err != nil {
return http.HandlerFunc(
func(rw http.ResponseWriter, req *http.Request) {
logError(req.Context(), "[ExternalAssetHandler] Invalid FRONTEND_DEVSERVER_URL. Should be valid URL", "error", err.Error())
http.Error(rw, err.Error(), http.StatusInternalServerError)
})
}
proxy := httputil.NewSingleHostReverseProxy(parsedURL)
proxy.ErrorHandler = func(rw http.ResponseWriter, r *http.Request, err error) {
logError(r.Context(), "[ExternalAssetHandler] Proxy error", "error", err.Error())
rw.WriteHeader(http.StatusBadGateway)
}
return proxy
}
func GetDevServerURL() string {
return os.Getenv("FRONTEND_DEVSERVER_URL")
}