Refactor split long functions (#135)

we have big functions that handle all stuff ... we should split this into smaler chuncks so we could test them seperate and make clear cuts in what happens where

Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/135

server/handler/handler_test.go

@@ -0,0 +1,48 @@
+package handler
+
+import (
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"codeberg.org/codeberg/pages/server/cache"
+	"codeberg.org/codeberg/pages/server/gitea"
+	"github.com/rs/zerolog/log"
+)
+
+func TestHandlerPerformance(t *testing.T) {
+	giteaClient, _ := gitea.NewClient("https://codeberg.org", "", cache.NewKeyValueCache(), false, false)
+	testHandler := Handler(
+		"codeberg.page", "raw.codeberg.org",
+		giteaClient,
+		"https://docs.codeberg.org/pages/raw-content/",
+		[]string{"/.well-known/acme-challenge/"},
+		[]string{"raw.codeberg.org", "fonts.codeberg.org", "design.codeberg.org"},
+		cache.NewKeyValueCache(),
+		cache.NewKeyValueCache(),
+	)
+
+	testCase := func(uri string, status int) {
+		req := httptest.NewRequest("GET", uri, nil)
+		w := httptest.NewRecorder()
+
+		log.Printf("Start: %v\n", time.Now())
+		start := time.Now()
+		testHandler(w, req)
+		end := time.Now()
+		log.Printf("Done: %v\n", time.Now())
+
+		resp := w.Result()
+
+		if resp.StatusCode != status {
+			t.Errorf("request failed with status code %d", resp.StatusCode)
+		} else {
+			t.Logf("request took %d milliseconds", end.Sub(start).Milliseconds())
+		}
+	}
+
+	testCase("https://mondstern.codeberg.page/", 424) // TODO: expect 200
+	testCase("https://mondstern.codeberg.page/", 424) // TODO: expect 200
+	testCase("https://example.momar.xyz/", 424)       // TODO: expect 200
+	testCase("https://codeberg.page/", 424)           // TODO: expect 200
+}