epee-service/main.go

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2023-03-19 15:07:40 +01:00
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"}`))
}