ci(backend): 调整 embed server

backend/internal/web/embed_on.go

@@ -0,0 +1,75 @@
+//go:build embed
+
+package web
+
+import (
+	"embed"
+	"io"
+	"io/fs"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+//go:embed all:dist
+var frontendFS embed.FS
+
+func ServeEmbeddedFrontend() gin.HandlerFunc {
+	distFS, err := fs.Sub(frontendFS, "dist")
+	if err != nil {
+		panic("failed to get dist subdirectory: " + err.Error())
+	}
+	fileServer := http.FileServer(http.FS(distFS))
+
+	return func(c *gin.Context) {
+		path := c.Request.URL.Path
+
+		if strings.HasPrefix(path, "/api/") ||
+			strings.HasPrefix(path, "/v1/") ||
+			strings.HasPrefix(path, "/setup/") ||
+			path == "/health" {
+			c.Next()
+			return
+		}
+
+		cleanPath := strings.TrimPrefix(path, "/")
+		if cleanPath == "" {
+			cleanPath = "index.html"
+		}
+
+		if file, err := distFS.Open(cleanPath); err == nil {
+			_ = file.Close()
+			fileServer.ServeHTTP(c.Writer, c.Request)
+			c.Abort()
+			return
+		}
+
+		serveIndexHTML(c, distFS)
+	}
+}
+
+func serveIndexHTML(c *gin.Context, fsys fs.FS) {
+	file, err := fsys.Open("index.html")
+	if err != nil {
+		c.String(http.StatusNotFound, "Frontend not found")
+		c.Abort()
+		return
+	}
+	defer func() { _ = file.Close() }()
+
+	content, err := io.ReadAll(file)
+	if err != nil {
+		c.String(http.StatusInternalServerError, "Failed to read index.html")
+		c.Abort()
+		return
+	}
+
+	c.Data(http.StatusOK, "text/html; charset=utf-8", content)
+	c.Abort()
+}
+
+func HasEmbeddedFrontend() bool {
+	_, err := frontendFS.ReadFile("dist/index.html")
+	return err == nil
+}