FEAT(Asset): Add ability to generate whole page of labels

RIGS/templatetags/filters.py

@@ -114,10 +114,8 @@ def orderby(request, field, attr):
 
     return dict_.urlencode()
 
-# Used for accessing outside of a form, i.e. in detail views of RiskAssessment and EventChecklist
 
-
-@register.filter(needs_autoescape=True)
+@register.filter(needs_autoescape=True)  # Used for accessing outside of a form, i.e. in detail views of RiskAssessment and EventChecklist
 def get_field(obj, field, autoescape=True):
     value = getattr(obj, field)
     if(isinstance(value, bool)):
@@ -221,7 +219,7 @@ def button(type, url=None, pk=None, clazz="", icon=None, text="", id=None, style
     return {'target': url, 'pk': pk, 'class': clazz, 'icon': icon, 'text': text, 'id': id, 'style': style}
 
 
-@register.simple_tag
+@register.simple_tag  # TODO Can these be done with annotation/aggregation?
 def invoices_waiting():
     return len(models.Event.objects.waiting_invoices())
 

assets/converters.py

@@ -1,3 +1,6 @@
+import urllib.parse
+
+
 class AssetIDConverter:  # Forces lowercase to uppercase
     regex = '[^/]+'
 
@@ -6,3 +9,16 @@ class AssetIDConverter:  # Forces lowercase to uppercase
 
     def to_url(self, value):
         return str(value).upper()
+
+
+class ListConverter:
+    regex = '[^/]+'
+
+    def to_python(self, value):
+        return value.split(',')
+
+    def to_url(self, value):
+        string = ""
+        for i in value:
+            string += "," + str(i)
+        return string[1:]

assets/templates/asset_list.html

@@ -1,6 +1,7 @@
 {% extends 'base_assets.html' %}
 {% load paginator from filters %}
 {% load button from filters %}
+{% load ids_from_objects from asset_tags %}
 {% load widget_tweaks %}
 {% load static %}
 
@@ -85,6 +86,9 @@
 <div class="row my-2">
     <div class="col text-right px-0">
     {% button 'new' 'asset_create' style="width: 6em" %}
+    {% if object_list %}
+    <a class="btn btn-primary" href="{% url 'generate_labels' object_list|ids_from_objects %}"><span class="fas fa-barcode"></span> Generate Labels</a>
+    {% endif %}
     </div>
 </div>
 <div class="row my-2">

assets/templates/labels_print.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE document SYSTEM "rml.dtd">
+{% load multiply from filters %}
+{% load index from asset_tags %}
+<document filename="{{filename}}">
+    <template>
+        <pageTemplate id="main">
+            <pageGraphics>
+            </pageGraphics>
+            <frame id="first" x1="5" y1="-10" width="581" height="842"/>
+        </pageTemplate>
+    </template>
+    <stylesheet>
+        <blockTableStyle id="table">
+        <!-- show a grid: this also comes in handy for debugging your tables.-->
+        <lineStyle kind="GRID" colorName="black" thickness="1" start="0,0" stop="-1,-1" />
+        </blockTableStyle>
+    </stylesheet>
+    <story>
+        <blockTable style="table">
+            {% for i in images0 %}
+            <tr>
+                <td>{% with images0|index:forloop.counter0 as image %}{% if image %}<illustration width="120" height="35"><image file="data:image/png;base64,{{image}}" x="0" y="0"
+width="120" height="35"/></illustration>{% endif %}{% endwith %}</td>
+                <td>{% with images1|index:forloop.counter0 as image %}{% if image %}<illustration width="120" height="35"><image file="data:image/png;base64,{{image}}" x="0" y="0"
+width="120" height="35"/></illustration>{% endif %}{% endwith %}</td>
+                <td>{% with images2|index:forloop.counter0 as image %}{% if image %}<illustration width="120" height="35"><image file="data:image/png;base64,{{image}}" x="0" y="0"
+width="120" height="35"/></illustration>{% endif %}{% endwith %}</td>
+                <td>{% with images3|index:forloop.counter0 as image %}{% if image %}<illustration width="120" height="35"><image file="data:image/png;base64,{{image}}" x="0" y="0"
+width="120" height="35"/></illustration>{% endif %}{% endwith %}</td>
+            </tr>
+            {% endfor %}
+        </blockTable>
+    </story>
+</document>

assets/templates/partials/asset_buttons.html

@@ -12,9 +12,7 @@
         {% button 'edit' url='asset_update' pk=object.asset_id %}
         {% button 'duplicate' url='asset_duplicate' pk=object.asset_id %}
         <a type="button" class="btn btn-info" href="{% url 'asset_audit' object.asset_id %}"><span class="fas fa-certificate"></span> Audit</a>
-        {% if object.is_cable %}
         <a type="button" class="btn btn-primary" href="{% url 'generate_label' object.asset_id %}"><span class="fas fa-barcode"></span> Generate Label</a>
-        {% endif %}
     </div>
     {% endif %}
     {% if create or edit or duplicate %}

assets/templatetags/asset_tags.py

@@ -0,0 +1,17 @@
+from django import template
+from assets import models
+
+register = template.Library()
+
+
+@register.filter
+def ids_from_objects(object_list):
+    id_list = []
+    for obj in object_list:
+        id_list.append(obj.asset_id)
+    return id_list
+
+
+@register.filter
+def index(indexable, i):
+    return indexable[i] if i < len(indexable) else None

assets/urls.py

@@ -7,6 +7,7 @@ from PyRIGS.views import OEmbedView
 from . import views, converters
 
 register_converter(converters.AssetIDConverter, 'asset')
+register_converter(converters.ListConverter, 'list')
 
 urlpatterns = [
     path('', login_required(views.AssetList.as_view()), name='asset_index'),
@@ -19,6 +20,7 @@ urlpatterns = [
     path('asset/id/<asset:pk>/duplicate/', permission_required_with_403('assets.add_asset')
          (views.AssetDuplicate.as_view()), name='asset_duplicate'),
     path('asset/id/<asset:pk>/label', login_required(views.GenerateLabel.as_view()), name='generate_label'),
+    path('asset/<list:ids>/list/label',  views.GenerateLabels.as_view(), name='generate_labels'),
 
     path('cabletype/list/', login_required(views.CableTypeList.as_view()), name='cable_type_list'),
     path('cabletype/create/', permission_required_with_403('assets.add_cable_type')(views.CableTypeCreate.as_view()), name='cable_type_create'),

assets/views.py

@@ -1,5 +1,8 @@
 import simplejson
 import random
+import base64
+from io import BytesIO
+
 from django.contrib import messages
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.core import serializers
@@ -11,10 +14,13 @@ from django.utils.decorators import method_decorator
 from django.views import generic
 from django.views.decorators.csrf import csrf_exempt
 from django.shortcuts import get_object_or_404
+from django.template.loader import get_template
 
+from PyPDF2 import PdfFileMerger, PdfFileReader
 from PIL import Image, ImageDraw, ImageFont
 from barcode import Code39
 from barcode.writer import ImageWriter
+from z3c.rml import rml2pdf
 
 from PyRIGS.views import GenericListView, GenericDetailView, GenericUpdateView, GenericCreateView, ModalURLMixin, \
     is_ajax, OEmbedView
@@ -349,8 +355,7 @@ class CableTypeUpdate(generic.UpdateView):
         return reverse("cable_type_detail", kwargs={"pk": self.object.pk})
 
 
-class GenerateLabel(generic.View):
-    def get(self, request, pk):
+def generate_label(pk):
     black = (0, 0, 0)
     white = (255, 255, 255)
     size = (700, 200)
@@ -358,6 +363,7 @@ class GenerateLabel(generic.View):
     obj = get_object_or_404(models.Asset, asset_id=pk)
 
     asset_id = "Asset: {}".format(obj.asset_id)
+    if obj.is_cable:
         length = "Length: {}m".format(obj.length)
         csa = "CSA: {}mm²".format(obj.csa)
 
@@ -366,8 +372,9 @@ class GenerateLabel(generic.View):
     draw = ImageDraw.Draw(image)
 
     draw.text((210, 140), asset_id, fill=black, font=font)
+    if obj.is_cable:
         draw.text((210, 170), length, fill=black, font=font)
-        draw.text((350, 170), csa, fill=black, font=font)
+        draw.text((360, 170), csa, fill=black, font=font)
     draw.multiline_text((500, 140), "TEC PA & Lighting\n(0115) 84 68720", fill=black, font=font)
 
     barcode = Code39(str(obj.asset_id), writer=ImageWriter())
@@ -378,6 +385,52 @@ class GenerateLabel(generic.View):
     width, height = barcode_image.size
     image.paste(barcode_image.crop((0, 0, width, 135)), (int(((size[0] + logo_size[0]) - width) / 2), 0))
 
+    return image
+
+
+class GenerateLabel(generic.View):  # TODO Caching
+    def get(self, request, pk):
         response = HttpResponse(content_type="image/png")
-        image.save(response, "PNG")
+        generate_label(pk).save(response, "PNG")
+        return response
+
+
+class GenerateLabels(generic.View):
+    def get(self, request, ids):
+        response = HttpResponse(content_type='application/pdf')
+        template = get_template('labels_print.xml')
+
+        images = []
+
+        for asset_id in ids:
+            image = generate_label(asset_id)
+            in_mem_file = BytesIO()
+            image.save(in_mem_file, format="PNG")
+            # reset file pointer to start
+            in_mem_file.seek(0)
+            img_bytes = in_mem_file.read()
+
+            base64_encoded_result_bytes = base64.b64encode(img_bytes)
+            base64_encoded_result_str = base64_encoded_result_bytes.decode('ascii')
+            images.append(base64_encoded_result_str)
+
+        context = {
+            'images0': images[::4],
+            'images1': images[1::4],
+            'images2': images[2::4],
+            'images3': images[3::4],
+            'filename': "Asset Label Sheet generated at {}".format(timezone.now())
+        }
+        merger = PdfFileMerger()
+
+        rml = template.render(context)
+        buffer = rml2pdf.parseString(rml)
+        merger.append(PdfFileReader(buffer))
+        buffer.close()
+
+        merged = BytesIO()
+        merger.write(merged)
+
+        response['Content-Disposition'] = 'filename="{}"'.format(context['filename'])
+        response.write(merged.getvalue())
         return response