Initialize AutoLibrary website with Gitea deployment

backend/handlers/themes_handler/download.go

@@ -0,0 +1,71 @@
+package themes_handler
+
+import (
+	"errors"
+	"fmt"
+	"mime"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"autolibrary.top/webserver/backend/models/themes_model"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+func (h *Handler) DownloadTheme(c *gin.Context)      { h.serveTheme(c, true) }
+func (h *Handler) AdminDownloadTheme(c *gin.Context) { h.serveTheme(c, false) }
+
+func (h *Handler) serveTheme(c *gin.Context, public bool) {
+	id, err := parseThemeID(c)
+	if err != nil {
+		fail(c, http.StatusBadRequest, "Invalid theme ID")
+		return
+	}
+	var theme themes_model.Theme
+	query := h.DB
+	if public {
+		query = query.Where("status = ?", themes_model.ThemeApproved)
+	}
+	err = query.First(&theme, id).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		fail(c, 404, "Theme not found")
+		return
+	}
+	if err != nil {
+		fail(c, 500, "Unable to load theme")
+		return
+	}
+	path := h.Themes.ArchivePath(theme.ID)
+	info, err := os.Stat(path)
+	if err != nil || info.IsDir() {
+		fail(c, 404, "Theme file not found")
+		return
+	}
+	if public {
+		h.DB.Model(&theme).UpdateColumn("download_count", gorm.Expr("download_count + 1"))
+	}
+	version := strings.TrimLeft(theme.Version, "vV")
+	name := fmt.Sprintf("%s_v%s.altheme", theme.Name, version)
+	c.Header("Content-Disposition", mime.FormatMediaType("attachment", map[string]string{"filename": name}))
+	c.Header("Content-Type", "application/zip")
+	c.File(path)
+}
+
+func (h *Handler) ServePreview(c *gin.Context) {
+	name := c.Param("filename")
+	if name == "." || name == ".." || strings.ContainsAny(name, `/\`) || filepath.Base(name) != name {
+		fail(c, 400, "Invalid preview filename")
+		return
+	}
+	path := filepath.Join(h.Files.Root(), "previews", name)
+	info, err := os.Stat(path)
+	if err != nil || info.IsDir() {
+		fail(c, 404, "Preview not found")
+		return
+	}
+	c.Header("Cache-Control", "public, max-age=3600")
+	c.File(path)
+}