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