Added GTIN product storage and remote service integration

asset/admin.py

@@ -1,5 +1,6 @@
 from django.contrib import admin
 
-from .models import Asset
+from .models import Asset, GtinProduct
 
 admin.site.register(Asset)
+admin.site.register(GtinProduct)

asset/forms.py

@@ -0,0 +1,7 @@
+from django import forms
+
+class AssetForm(forms.Form):
+    named_id = forms.CharField(label='Asset named ID', max_length=30)
+    description = forms.CharField(label='Description', max_length=250)
+    color = forms.CharField(label='Color', max_length=20)
+    container_type = forms.ChoiceField(label='Container Type', )

asset/gtin_service.py

@@ -0,0 +1,41 @@
+from .models import GtinProduct
+from django.db.models import ObjectDoesNotExist
+import requests
+import logging
+
+LOGGER = logging.getLogger(__name__)
+
+
+def ask_upcitemdb_service(gtin):
+    request = f'https://api.upcitemdb.com/prod/trial/lookup?upc={gtin}'
+    response = requests.get(request)
+    if response.status_code == 200:
+        productJson = response.json()
+        print(f"Got {productJson['total']} result records")
+        if productJson['total'] > 0:
+            product = GtinProduct.objects.create(gtin=gtin, api_request=request, api_response=productJson)
+            if 'title' in productJson['items'][0]:
+                product.name = productJson['items'][0]['title']
+            if 'brand' in productJson['items'][0]:
+                product.brand = productJson['items'][0]['brand']
+            LOGGER.debug(
+                f"Creating new product entry for gtin={gtin}:\nrequest={request}\nresponse={response.status_code}:{productJson}")
+            product.save()
+            return product
+    return None
+
+
+def ask_remote_services(gtin):
+    product = ask_upcitemdb_service(gtin)
+    if product is not None:
+        return product
+    return None
+
+
+def get_by_gtin(gtin):
+    try:
+        product = GtinProduct.objects.get(gtin=gtin)
+    except ObjectDoesNotExist:
+        # ask remote services
+        product = ask_remote_services(gtin)
+    return product

asset/migrations/0003_gtinproduct.py

@@ -0,0 +1,26 @@
+# Generated by Django 4.0.3 on 2022-04-13 12:08
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('asset', '0002_auto_20220310_1620'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='GtinProduct',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('gtin', models.CharField(max_length=40, unique=True)),
+                ('api_request', models.CharField(max_length=250)),
+                ('api_response', models.CharField(max_length=4096)),
+                ('name', models.CharField(blank=True, max_length=200)),
+                ('brand', models.CharField(blank=True, max_length=40)),
+                ('created_ts', models.DateTimeField(auto_now_add=True, verbose_name='datetime created')),
+                ('changed_ts', models.DateTimeField(auto_now=True, verbose_name='datetime updated')),
+            ],
+        ),
+    ]

asset/models.py

@@ -23,3 +23,13 @@ class Asset(models.Model):
 
     def get_absolute_url(self):
         return reverse('asset:detail', kwargs={'pk': self.pk})
+
+
+class GtinProduct(models.Model):
+    gtin = models.CharField(max_length=40, unique=True)
+    api_request = models.CharField(max_length=250)
+    api_response = models.CharField(max_length=4096)
+    name = models.CharField(max_length=200, blank=True)
+    brand = models.CharField(max_length=40, blank=True)
+    created_ts = models.DateTimeField('datetime created', auto_now_add=True)
+    changed_ts = models.DateTimeField('datetime updated', auto_now=True)

asset/templates/asset/asset_list.html

@@ -49,10 +49,23 @@
   <!-- Action buttons -->
   <div class="row">
   
+    <form method="post" action="{% url 'asset:add-by-gtin' %}">
+        {% csrf_token %}
         <div class="col-sm-12">
+            <div class="col-4">
               <a class="btn btn-primary" href="{% url 'asset:add' %}" role="button">+ Asset</a>
               <a class="btn btn-primary" href="{% url 'container:add' %}" role="button">+ Container</a>
             </div>
+            <div class="col-4">
+                <div class="input-group">
+                    <input type="text" class="form-control" name="gtin" placeholder="EAN, UPC or GTIN" maxlength="20">
+                    <div class="input-group-append">
+                        <button class="btn btn-primary" type="submit" id="assetFromGtin">+Asset from GTIN</button>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </form>
 
   </div>
   <!-- End Action buttons -->

asset/urls.py

@@ -1,11 +1,12 @@
 from django.urls import path
 from . import views
-from asset.views import AssetCreateView, AssetDeleteView, AssetUpdateView, AssetListView
+from asset.views import AssetCreateView, AssetDeleteView, AssetUpdateView, AssetListView, asset_from_gtin
 
 app_name = 'asset'
 urlpatterns = [
     path('', AssetListView.as_view(), name='list'),
     path('add/', AssetCreateView.as_view(), name='add'),
+    path('addbygtin/', asset_from_gtin, name='add-by-gtin'),
     path('<int:pk>/', AssetUpdateView.as_view(), name='update'),
     path('<int:pk>/', AssetUpdateView.as_view(), name='detail'),
     path('<int:pk>/delete/', AssetDeleteView.as_view(), name='delete'),

asset/views.py

@@ -54,3 +54,15 @@ def asset_save(request, asset_id):
     asset.quantity = request.POST['quantity']
     asset.save();
     return HttpResponseRedirect(reverse('asset:list'))
+
+
+def asset_from_gtin(request):
+    from .gtin_service import get_by_gtin
+    gtin = request.POST['gtin']
+    print(f'Try gtin={gtin}')
+    product = get_by_gtin(gtin)
+    if product is None:
+        print(f'ERROR: Could not create asset for gtin={gtin}')
+    else:
+        print(f'Create new product: {product.name}, brand={product.brand}, gtin={product.gtin}')
+    return HttpResponseRedirect(reverse('asset:list'))