Init

main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"embed"
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+)
+
+//go:embed static
+var staticFS embed.FS
+
+//go:embed templates
+var templatesFS embed.FS
+
+// Error model
+type Error struct {
+	Title   string `json:"title"`
+	Message string `json:"message"`
+}
+
+func main() {
+	port := "5900"
+
+	http.Handle("/static/", http.FileServer(http.FS(staticFS)))
+	http.HandleFunc("/", errorHandler)
+
+	log.Printf("Listening on :%s...", port)
+	err := http.ListenAndServe(fmt.Sprintf(":%s", port), nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func errorHandler(w http.ResponseWriter, r *http.Request) {
+	errorCode := r.URL.Query().Get("error")
+
+	// Load error messages from JSON file
+	jsonData, err := templatesFS.ReadFile("templates/errors.json")
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	errors := make(map[string]Error)
+	err = json.Unmarshal(jsonData, &errors)
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	errorData := errors[errorCode]
+	if errorData.Title == "" {
+		errorData.Title = "Error"
+		errorData.Message = "An error occurred."
+	}
+
+	// Render error page
+	tmpl, err := templatesFS.ReadFile("templates/error.html")
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	t, err := template.New("error").Parse(string(tmpl))
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	t.Execute(w, errorData)
+}
+
+func generateInternalServerError(w http.ResponseWriter, err error) {
+	log.Println(err)
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(http.StatusInternalServerError)
+	w.Write([]byte(`{"error": "Internal Server Error"}`))
+}