Added code generator for bulk coupons

src/pretix/control/forms/vouchers.py

@@ -87,7 +87,7 @@ class VoucherBulkForm(VoucherForm):
         widget=forms.Textarea,
         label=_("Codes"),
         help_text=_(
-            "Add one voucher code per line"
+            "Add one voucher code per line. We suggest that you copy this list and save it into a file."
         )
     )
 

src/pretix/control/templates/pretixcontrol/vouchers/bulk.html

@@ -9,6 +9,20 @@
         {% bootstrap_form_errors form %}
         <fieldset>
             <legend>{% trans "Voucher codes" %}</legend>
+            <div class="form-group">
+                <div class="col-md-6 col-md-offset-3">
+                    <div class="input-group">
+                        <input type="text" class="form-control input-xs"
+                               id="voucher-bulk-codes-num"
+                               placeholder="{% trans "Number" %}">
+                        <div class="input-group-btn">
+                            <button class="btn btn-default" type="button" id="voucher-bulk-codes-generate">
+                                {% trans "Generate random codes" %}
+                            </button>
+                        </div>
+                    </div>
+                </div>
+            </div>
             {% bootstrap_field form.codes layout="horizontal" %}
         </fieldset>
         <fieldset>

src/static/pretixcontrol/js/ui/main.js

@@ -53,4 +53,29 @@ $(function () {
         $("#id_required").change(question_page_toggle_view);
         question_page_toggle_view();
     }
+
+    // Vouchers
+    $("#voucher-bulk-codes-generate").click(function () {
+        var charset = "ABCDEFGHKLMNPQRSTUVWXYZ23456789",
+            i = 0, j = 0, len = 16,
+            num = parseInt($("#voucher-bulk-codes-num").val()), text = "";
+        for (j = 0; j < num; j++) {
+            var key = [];
+            if (window.crypto && window.crypto.getRandomValues && Uint8Array) {
+                key = new Uint8Array(len);
+                window.crypto.getRandomValues(key);
+            } else {
+                for (i = 0; i < len; i++) {
+                    key.push(Math.floor(Math.random() * charset.length));
+                }
+            }
+            if (i > 0) {
+                text += "\n";
+            }
+            for (i = 0; i < len; i++) {
+                text += charset.charAt(key[i] % charset.length);
+            }
+        }
+        $("#id_codes").html(text);
+    });
 });