Elia el Lazkani
95c29b1f4b
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continuous-integration/drone/push Build is passing
94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
package main
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import (
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"fmt"
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"io"
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"net"
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"log"
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"net/http"
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"net/url"
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"time"
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)
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type ReverseProxy struct {
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URL *url.URL
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jwtKey string
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}
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func (rp *ReverseProxy) reverseProxyHandlerFunc() http.Handler {
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return http.HandlerFunc(rp.reverseProxyHandler)
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}
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func (rp *ReverseProxy) reverseProxyHandler(rw http.ResponseWriter, req *http.Request) {
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fmt.Printf("[sidoxy] Reverse proxy received request at: %s\n", time.Now())
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// set req Host, URL and Request URI to forward a request to the origin server
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req.Host = rp.URL.Host
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req.URL.Host = rp.URL.Host
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req.URL.Scheme = rp.URL.Scheme
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req.RequestURI = ""
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// set X-FORWARDED-FOR
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xForwardedFor := req.Header.Get("X-Forwarded-For")
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var remoteAddr string
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if xForwardedFor != "" {
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remoteAddr = xForwardedFor
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} else {
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remoteAddr, _, _ = net.SplitHostPort(req.RemoteAddr)
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}
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req.Header.Set("X-Forwarded-For", remoteAddr)
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fmt.Printf("[sidoxy] Reverse proxy setting X-Forwarded-For to %s\n", remoteAddr)
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// TODO: To be implemented
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// decode JWT if key present
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if rp.jwtKey != "" {
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jwtDecode(rp.jwtKey, req.Header.Get("JWT_TOKEN"), req)
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}
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// save the response from the origin server
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originServerResponse, err := http.DefaultClient.Do(req)
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if err != nil {
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rw.WriteHeader(http.StatusInternalServerError)
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_, _ = fmt.Fprint(rw, err)
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return
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}
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fmt.Printf("[sidoxy] Reverse proxy setting the following return headers\n")
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// return Header response
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for key, values := range originServerResponse.Header {
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for _, value := range values {
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fmt.Printf("[sidoxy] \t%v: %v\n", key, value)
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rw.Header().Set(key, value)
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}
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}
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// support stream
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done := make(chan bool)
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defer close(done)
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go func() {
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for {
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select {
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case <-time.Tick(10 * time.Millisecond):
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rw.(http.Flusher).Flush()
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case <-done:
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return
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}
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}
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}()
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// return response to the client
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rw.WriteHeader(http.StatusOK)
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io.Copy(rw, originServerResponse.Body)
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}
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func parse_url(host_url string) *url.URL {
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h_url, err := url.Parse(host_url)
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if err != nil {
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log.Fatal("[sidoxy] Invalid server URL: " + host_url)
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}
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return h_url
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}
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func listen_and_serve(address string, handler http.Handler) error {
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return http.ListenAndServe(address, handler)
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}
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