chore: add ssr placeholder in index.html

server/frontend/frontend.go

@@ -0,0 +1,68 @@
+package frontend
+
+import (
+	"embed"
+	"io/fs"
+	"net/http"
+	"strings"
+
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+
+	"github.com/usememos/memos/internal/util"
+)
+
+//go:embed dist
+var embeddedFiles embed.FS
+
+//go:embed dist/index.html
+var rawIndexHTML string
+
+func Serve(e *echo.Echo) {
+	// Use echo static middleware to serve the built dist folder
+	// refer: https://github.com/labstack/echo/blob/master/middleware/static.go
+	e.Use(middleware.StaticWithConfig(middleware.StaticConfig{
+		Skipper:    defaultAPIRequestSkipper,
+		HTML5:      true,
+		Filesystem: getFileSystem("dist"),
+	}))
+
+	assetsGroup := e.Group("assets")
+	assetsGroup.Use(middleware.GzipWithConfig(middleware.GzipConfig{
+		Skipper: defaultAPIRequestSkipper,
+		Level:   5,
+	}))
+	assetsGroup.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			c.Response().Header().Set(echo.HeaderCacheControl, "max-age=31536000, immutable")
+			return next(c)
+		}
+	})
+	assetsGroup.Use(middleware.StaticWithConfig(middleware.StaticConfig{
+		Skipper:    defaultAPIRequestSkipper,
+		HTML5:      true,
+		Filesystem: getFileSystem("dist/assets"),
+	}))
+
+	registerRoutes(e)
+}
+
+func registerRoutes(e *echo.Echo) {
+	e.GET("/m/:memoID", func(c echo.Context) error {
+		indexHTML := strings.ReplaceAll(rawIndexHTML, "<!-- memos.metadata -->", "<meta name=\"memos-memo-id\" content=\""+c.Param("memoID")+"\">"+"\n")
+		return c.HTML(http.StatusOK, indexHTML)
+	})
+}
+
+func getFileSystem(path string) http.FileSystem {
+	fs, err := fs.Sub(embeddedFiles, path)
+	if err != nil {
+		panic(err)
+	}
+	return http.FS(fs)
+}
+
+func defaultAPIRequestSkipper(c echo.Context) bool {
+	path := c.Request().URL.Path
+	return util.HasPrefixes(path, "/api", "/memos.api.v2")
+}