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