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package main
import (
"fmt"
"github.com/valyala/fasthttp"
"net/http"
)
// RequestHandler keeps data relevant to the request handlers.
type RequestHandler struct {
// Pointer to the global Portgate config, the values of which can change at runtime.
config *Config
// HTTP Client for requesting resources from the destination host.
client fasthttp.Client
}
// handleRequest handles all types of requests and delegates to more specific handlers.
func (h *RequestHandler) handleRequest(ctx *fasthttp.RequestCtx) {
path := ParsePath(string(ctx.Path()))
if path.DestinationIdentifier == -1 {
// We were not given a port.
if path.ResourcePath == "/_portgate" {
h.handlePortgateRequest(ctx)
} else {
// Try to grab actual destination from Referer header.
refererPath, err := ParsePathFromReferer(path, string(ctx.Request.Header.Referer()))
if err != nil || refererPath.DestinationIdentifier == -1 {
// The referer path also has no destination
h.handleUnknownRequest(ctx)
} else {
// We found the destination from the referer path, so we
// redirect the user to the Portgate URL they should've requested.
portgateUrl := fmt.Sprintf("/%d%s", refererPath.DestinationIdentifier, refererPath.ResourcePath)
ctx.Redirect(portgateUrl, http.StatusTemporaryRedirect)
}
}
} else {
// We were given a port, so we have to pass the request through to the destination host.
h.handlePassthroughRequest(ctx, path)
}
}
// handlePassthroughRequest handles requests which are supposed to be proxied to the destination host.
// If the user is authorized they are allowed to pass, otherwise they should be redirected to
// the authentication page. (/_portgate)
func (h *RequestHandler) handlePassthroughRequest(ctx *fasthttp.RequestCtx, p Path) {
// TODO: Check authorization.
// TODO: Check whether port is allowed to be accessed.
// We reuse the request given to us by the user with minor changes to route it to the
// destination host.
ctx.Request.SetRequestURI(p.MakeUrl(h.config.targetHost))
ctx.Request.Header.Set("Host", h.config.TargetAddress(p.DestinationIdentifier))
// We pipe the response given to us by the destination host back to the user.
// Since it's possible that we get a redirect, we take this into account,
// but only allow upto 10 redirects.
err := h.client.DoRedirects(&ctx.Request, &ctx.Response, 10)
if err != nil {
ctx.SetStatusCode(http.StatusInternalServerError)
_, _ = ctx.WriteString("An error occurred.")
}
}
// handlePortgateRequest handles all Portgate specific request for either showing Portgate
// specific pages or handling creation of authorization tokens.
func (h *RequestHandler) handlePortgateRequest(ctx *fasthttp.RequestCtx) {
// TODO: Implement authentication, authorization
_, _ = ctx.WriteString("Portgate request.")
}
// handleUnknownRequest handles any request which could not be processed due to missing
// information.
func (h *RequestHandler) handleUnknownRequest(ctx *fasthttp.RequestCtx) {
// TODO: Show error page
ctx.SetStatusCode(http.StatusNotFound)
_, _ = ctx.WriteString("Unknown request.")
}
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