Add support for generating the QR code in the page.

endpoint.go

@@ -4,7 +4,11 @@ import (
 	"errors"
 	"log/slog"
 	"net/http"
+	"strconv"
 	"strings"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/skip2/go-qrcode"
 )
 func getFavicon(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-type", "image/x-icon")
@@ -12,6 +16,65 @@ func getFavicon(w http.ResponseWriter, r *http.Request) {
 	http.ServeFile(w, r, "static/favicon.ico")
 }
 
+func getQRCodeReport(w http.ResponseWriter, r *http.Request) {
+	code := chi.URLParam(r, "code")
+	if code == "" {
+		respondError(w, "There should always be a code", nil, http.StatusBadRequest)
+	}
+	content := BaseURL + "/report/" + code
+	// Get optional size parameter (default to 256)
+	size := 256
+	if sizeStr := r.URL.Query().Get("size"); sizeStr != "" {
+		var err error
+		size, err = strconv.Atoi(sizeStr)
+		if err != nil {
+			http.Error(w, "Invalid 'size' parameter, must be an integer", http.StatusBadRequest)
+			return
+		}
+	}
+
+	// Get optional error correction level (default to Medium)
+	level := qrcode.Medium
+	if levelStr := r.URL.Query().Get("level"); levelStr != "" {
+		switch levelStr {
+		case "L", "l":
+			level = qrcode.Low
+		case "M", "m":
+			level = qrcode.Medium
+		case "Q", "q":
+			level = qrcode.High
+		case "H", "h":
+			level = qrcode.Highest
+		default:
+			respondError(w, "Invalid 'level' parameter, must be L, M, Q, or H", nil, http.StatusBadRequest)
+			return
+		}
+	}
+
+	// Generate the QR code
+	var qr *qrcode.QRCode
+	var err error
+	qr, err = qrcode.New(content, level)
+	if err != nil {
+		respondError(w, "Error generating QR code", err, http.StatusInternalServerError)
+		return
+	}
+
+	// Set the appropriate content type
+	w.Header().Set("Content-Type", "image/png")
+	
+	// Generate PNG and write directly to the response writer
+	png, err := qr.PNG(size)
+	if err != nil {
+		respondError(w, "Error encoding QR code to PNG", err, http.StatusInternalServerError)
+		return
+	}
+
+	_, err = w.Write(png)
+	if err != nil {
+		respondError(w, "Error writing response", err, http.StatusInternalServerError)
+	}
+}
 func getReport(w http.ResponseWriter, r *http.Request) {
 	//org := r.URL.Query().Get("org")
 	err := htmlReport(w)