Servis: QR kod na štampanom nalogu

QR kod se generiše server-strano (skip2/go-qrcode) i ugrađuje kao
base64 PNG u zaglavlje štampe — skeniranjem se otvara nalog u programu

go.mod

@@ -17,6 +17,7 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e // indirect
 	github.com/stretchr/testify v1.11.1 // indirect
 	golang.org/x/sys v0.45.0 // indirect
 	golang.org/x/tools v0.44.0 // indirect

go.sum

@@ -26,6 +26,8 @@ github.com/pquerna/otp v1.5.0 h1:NMMR+WrmaqXU4EzdGJEE1aUUI0AMRzsp96fFFWNPwxs=
 github.com/pquerna/otp v1.5.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e h1:MRM5ITcdelLK2j1vwZ3Je0FKVCfqOLp5zO6trqMLYs0=
+github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e/go.mod h1:XV66xRDqSt+GTGFMVlhk3ULuV0y9ZmzeVGR4mloJI3M=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=

internal/handler/servis.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"encoding/base64"
 	"log/slog"
 	"net/http"
 	"strconv"
@@ -13,6 +14,7 @@ import (
 	"ntech/internal/model"
 
 	"github.com/go-chi/chi/v5"
+	qrcode "github.com/skip2/go-qrcode"
 )
 
 // PodaciServisa su podaci za stranicu sa listom servisnih naloga
@@ -591,6 +593,7 @@ type PodaciStampeServisa struct {
 	Adresa         string
 	Telefon        string
 	PIB            string
+	QRKod          string // base64 PNG QR koda sa URL-om naloga
 }
 
 // StampaServisa renderuje print-friendly stranicu za servisni nalog
@@ -644,6 +647,17 @@ func (h *Handler) StampaServisa(w http.ResponseWriter, r *http.Request) {
 		ukupnoDelovi += d.Ukupno()
 	}
 
+	// QR kod sadrži URL naloga — isti host kao što korisnik koristi
+	scheme := "http"
+	if r.TLS != nil {
+		scheme = "https"
+	}
+	nalogURL := scheme + "://" + r.Host + "/servis/" + strconv.FormatInt(id, 10)
+	var qrKod string
+	if png, err := qrcode.Encode(nalogURL, qrcode.Medium, 160); err == nil {
+		qrKod = base64.StdEncoding.EncodeToString(png)
+	}
+
 	h.renderujStandalone(w, "servis_stampa", PodaciStampeServisa{
 		Nalog:          *nalog,
 		ServisniDelovi: delovi,
@@ -655,6 +669,7 @@ func (h *Handler) StampaServisa(w http.ResponseWriter, r *http.Request) {
 		Adresa:         podesavanja["adresa"],
 		Telefon:        podesavanja["telefon"],
 		PIB:            podesavanja["pib"],
+		QRKod:          qrKod,
 	})
 }
 

web/templates/stranice/servis_stampa.html

@@ -81,10 +81,19 @@
             </div>
         </div>
         <div class="nalog-broj">
+            <div style="display:flex;align-items:flex-start;gap:14px;justify-content:flex-end;">
+                <div>
                     <div class="nalog-naslov">Servisni nalog</div>
                     <div class="nalog-broj-vrednost">{{.Nalog.BrojNaloga}}</div>
                     <div style="margin-top:6px;"><span class="status">{{.Nalog.Status}}</span></div>
                 </div>
+                {{if .QRKod}}
+                <img src="data:image/png;base64,{{.QRKod}}" width="80" height="80"
+                     alt="QR {{.Nalog.BrojNaloga}}"
+                     style="image-rendering:pixelated;border:1px solid #ddd;border-radius:4px;">
+                {{end}}
+            </div>
+        </div>
     </div>
 
     <!-- datumi i klijent -->