1 files changed, 61 insertions, 0 deletions
diff --git a/handlers/handler.go b/handlers/handler.go
new file mode 100644
index 0000000..6484c61
--- /dev/null
+++ b/handlers/handler.go
@@ -0,0 +1,61 @@
+package handlers
+
+import (
+	"fmt"
+	"github.com/valyala/fasthttp"
+	"net/http"
+	"portgate"
+)
+
+// 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
+}
+
+func NewRequestHandler(config *portgate.Config) RequestHandler {
+	return RequestHandler{
+		config: config,
+		client: fasthttp.Client{},
+	}
+}
+
+// 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.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 := 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.")
+}