Подготовить HY2XS к production-сборке

apps/frontend/embed.go

@@ -0,0 +1,75 @@
+package frontend
+
+import (
+	"embed"
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"io/fs"
+	"net/http"
+	"path"
+	"strings"
+)
+
+//go:embed dist/*
+var staticFiles embed.FS
+
+func InitFrontend(router *gin.Engine, relativePath string) {
+	router.GET(relativePath, func(c *gin.Context) {
+		indexHTML, err := staticFiles.ReadFile("dist/index.html")
+		if err != nil {
+			c.String(http.StatusInternalServerError, "Internal Server Error")
+			return
+		}
+		c.Data(http.StatusOK, "text/html", []byte(replaceRelativePaths(string(indexHTML), relativePath)))
+	})
+
+	router.GET(path.Join(relativePath, "favicon.ico"), func(c *gin.Context) {
+		indexHTML, err := staticFiles.ReadFile("dist/favicon.ico")
+		if err != nil {
+			c.String(http.StatusInternalServerError, "Internal Server Error")
+			return
+		}
+		c.Data(http.StatusOK, "image/x-icon", indexHTML)
+	})
+
+	router.StaticFS(path.Join(relativePath, "assets"), http.FS(getStaticFS()))
+
+	router.NoRoute(func(c *gin.Context) {
+		filePath := c.Request.URL.Path
+		if relativePath != "/" && !strings.HasPrefix(filePath, relativePath) {
+			c.String(http.StatusNotFound, "404")
+			return
+		}
+		fileContent, err := getFileContent(filePath)
+		if err != nil {
+			c.String(http.StatusNotFound, "404")
+			return
+		}
+		c.Data(http.StatusOK, http.DetectContentType(fileContent), fileContent)
+	})
+}
+
+func getStaticFS() fs.FS {
+	staticFs, _ := fs.Sub(staticFiles, "dist/assets")
+	return staticFs
+}
+
+func getFileContent(filePath string) ([]byte, error) {
+	fileContent, err := staticFiles.ReadFile(fmt.Sprintf("dist%s", filePath))
+	if err != nil {
+		return nil, err
+	}
+	return fileContent, nil
+}
+
+func replaceRelativePaths(htmlContent string, basePath string) string {
+	if basePath == "/" {
+		basePath = ""
+	}
+	htmlContent = strings.ReplaceAll(htmlContent, "/__dynamic_base__/", basePath+"/")
+	injection := fmt.Sprintf(`
+	<script>
+		window.__dynamic_base__ = "%s";
+	</script>`, basePath)
+	return strings.Replace(htmlContent, "</head>", injection+"</head>", 1)
+}