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package handlers
import (
"fmt"
"github.com/valyala/fasthttp"
"net/http"
"portgate"
"strings"
)
// 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 *portgate.Config
// HTTP Client for requesting resources from the destination host.
client fasthttp.Client
// Handler for static Portgate assets.
staticHandler fasthttp.RequestHandler
// Templates for Portgate pages.
templates portgate.Templates
}
// NewRequestHandler creates a new RequestHandler instance.
func NewRequestHandler(config *portgate.Config, templates portgate.Templates) RequestHandler {
// Serves static Portgate files when called.
fs := fasthttp.FS{
Root: "./assets/static/",
PathRewrite: func(ctx *fasthttp.RequestCtx) []byte {
return []byte(strings.TrimPrefix(string(ctx.Path()), "/_portgate/static"))
},
PathNotFound: nil,
}
staticHandler := fs.NewRequestHandler()
return RequestHandler{
config: config,
client: fasthttp.Client{},
staticHandler: staticHandler,
templates: templates,
}
}
// HandleRequest handles all types of requests and delegates to more specific handlers.
func (h *RequestHandler) HandleRequest(ctx *fasthttp.RequestCtx) {
path := portgate.ParsePath(string(ctx.Path()))
if path.IsPortgatePath() {
h.handlePortgateRequest(ctx, path)
return
}
if path.DestinationIdentifier == -1 {
// We were not given a destination.
// Try to grab actual destination from Referer header.
// This can help us if the user followed an absolute link on a proxied page.
refererPath, err := portgate.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)
}
}
// 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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