Being suport for binary builds, AUR, Flatpak

main.go

@@ -0,0 +1,163 @@
+// main.go
+package main
+
+import (
+	"bufio"
+	"embed"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/fs"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"strings"
+	"time"
+
+	webview "github.com/webview/webview_go"
+)
+
+//go:embed index.html ui/* images/*
+var content embed.FS
+
+type saveReq struct {
+	Filename string `json:"filename"`
+	Content  string `json:"content"`
+}
+
+type saveResp struct {
+	Path string `json:"path"`
+}
+
+func main() {
+	// Static files
+	subFS, err := fs.Sub(content, ".")
+	if err != nil {
+		log.Fatalf("fs.Sub error: %v", err)
+	}
+	mux := http.NewServeMux()
+	mux.Handle("/", http.FileServer(http.FS(subFS)))
+
+	// /save endpoint writes to Downloads
+	mux.HandleFunc("/save", func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		defer func() { log.Printf("%s %s %s", r.Method, r.URL.Path, time.Since(start)) }()
+
+		if r.Method != http.MethodPost {
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		var req saveReq
+		if err := json.NewDecoder(io.LimitReader(r.Body, 10<<20)).Decode(&req); err != nil {
+			http.Error(w, "bad json", http.StatusBadRequest)
+			return
+		}
+		if req.Filename == "" {
+			req.Filename = fmt.Sprintf("relibre-%d.html", time.Now().Unix())
+		}
+		req.Filename = sanitizeFilename(req.Filename)
+
+		dir := downloadsDir()
+		if err := os.MkdirAll(dir, 0o755); err != nil {
+			http.Error(w, "mkdir failed", http.StatusInternalServerError)
+			return
+		}
+		path := filepath.Join(dir, req.Filename)
+		if err := os.WriteFile(path, []byte(req.Content), 0o644); err != nil {
+			http.Error(w, "write failed", http.StatusInternalServerError)
+			return
+		}
+		log.Printf("Saved HTML -> %s", path)
+
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(saveResp{Path: path})
+	})
+
+	// Simple request logger
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		mux.ServeHTTP(w, r)
+		log.Printf("%s %s %s", r.Method, r.URL.Path, time.Since(start))
+	})
+
+	// Start server on ephemeral port
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		log.Fatalf("listen: %v", err)
+	}
+	addr := ln.Addr().String()
+	srv := &http.Server{Handler: handler, ReadHeaderTimeout: 5 * time.Second}
+
+	go func() {
+		log.Printf("HTTP listening on http://%s", addr)
+		if err := srv.Serve(ln); err != nil && err != http.ErrServerClosed {
+			log.Fatalf("http serve: %v", err)
+		}
+	}()
+
+	// Native webview window (debug true for dev tools/log signals)
+	debug := true
+	w := webview.New(debug)
+	defer w.Destroy()
+	w.SetTitle("Relibre")
+	w.SetSize(1100, 750, webview.HintNone)
+	w.Navigate(fmt.Sprintf("http://%s", addr))
+	w.Run()
+
+	_ = srv.Close()
+	if runtime.GOOS == "linux" {
+		time.Sleep(100 * time.Millisecond)
+	}
+}
+
+func sanitizeFilename(name string) string {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return "relibre.html"
+	}
+	if !strings.HasSuffix(strings.ToLower(name), ".html") {
+		name += ".html"
+	}
+	re := regexp.MustCompile(`[<>:"/\\|?*\x00-\x1F]`)
+	return re.ReplaceAllString(name, "_")
+}
+
+func downloadsDir() string {
+	if p := readXDGDownloads(); p != "" {
+		return p
+	}
+	home, _ := os.UserHomeDir()
+	if home == "" {
+		return "./"
+	}
+	return filepath.Join(home, "Downloads")
+}
+
+func readXDGDownloads() string {
+	home, _ := os.UserHomeDir()
+	if home == "" {
+		return ""
+	}
+	path := filepath.Join(home, ".config", "user-dirs.dirs")
+	f, err := os.Open(path)
+	if err != nil {
+		return ""
+	}
+	defer f.Close()
+	sc := bufio.NewScanner(f)
+	for sc.Scan() {
+		line := sc.Text()
+		if strings.HasPrefix(line, "XDG_DOWNLOAD_DIR=") {
+			raw := strings.TrimPrefix(line, "XDG_DOWNLOAD_DIR=")
+			raw = strings.Trim(raw, `"`)
+			raw = strings.ReplaceAll(raw, "$HOME", home)
+			return raw
+		}
+	}
+	return ""
+}
+