handlers/passthrough.go


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package handlers

import (
	"github.com/valyala/fasthttp"
	"portgate"
)

// 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 portgate.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(h.config.MakeUrl(p))
	ctx.Request.Header.SetHost(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 {
		h.handleError(ctx)
	}
}