Gestion des permissions dans K-Psul

- Ajout d'une méthode sur Account pour connaître les permissions
  nécessaires pour enregistrer des opérations en fonction du futur solde
  du compte
- Ajout d'une permission pour effectuer une charge sur un compte
- Ajoute que l'utilisateur connecté doit avoir toutes les permissions
  nécessaires pour enregistrer un groupe d'opérations. Si ce n'est pas
le cas, aucune opération n'est enregistrée et les permissions manquantes
sont envoyées en réponse.
- Dans le cas d'une charge ou d'un retrait, "article" et "article_nb" de
  Operation sont définis à NULL

kfet/forms.py

@@ -163,9 +163,11 @@ class KPsulOperationForm(forms.ModelForm):
                 raise ValidationError("Charge non positive")
             if type_ope == Operation.WITHDRAW and amount >= 0:
                 raise ValidationError("Retrait non négatif")
+            self.cleaned_data['article']    = None
+            self.cleaned_data['article_nb'] = None
 
 KPsulOperationFormSet = modelformset_factory(
-        Operation,
-        form    = KPsulOperationForm,
-        extra   = 1,
-        min_num = 1, validate_min = True)
+    Operation,
+    form    = KPsulOperationForm,
+    extra   = 1,
+    min_num = 1, validate_min = True)

kfet/migrations/0014_auto_20160807_2314.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kfet', '0013_auto_20160807_1840'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='globalpermissions',
+            options={'permissions': (('is_team', 'Is part of the team'), ('can_perform_deposit', 'Peut effectuer une charge')), 'managed': False},
+        ),
+    ]

kfet/migrations/0015_auto_20160807_2324.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kfet', '0014_auto_20160807_2314'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='globalpermissions',
+            options={'permissions': (('is_team', 'Is part of the team'), ('can_perform_deposit', 'Peut effectuer une charge'), ('can_perform_negative_operations', 'Peut enregistrer des commandes en négatif')), 'managed': False},
+        ),
+    ]

kfet/models.py

@@ -93,6 +93,13 @@ class Account(models.Model):
             data['is_free'] = True
         return data
 
+    def perms_to_perform_operation(self, amount):
+        new_balance = self.balance + amount
+        perms = []
+        if new_balance < 0:
+            perms.append('kfet.can_perform_negative_operations')
+        return perms
+
     # Surcharge Méthode save() avec gestions de User et CofProfile
     # Args:
     # - data : datas pour User et CofProfile
@@ -415,6 +422,9 @@ class GlobalPermissions(models.Model):
         managed = False
         permissions = (
             ('is_team', 'Is part of the team'),
+            ('can_perform_deposit', 'Peut effectuer une charge'),
+            ('can_perform_negative_operations',
+                'Peut enregistrer des commandes en négatif')
         )
 
 class Settings(models.Model):
@@ -437,4 +447,5 @@ class Settings(models.Model):
             return 0
 
     class SettingsError(Exception):
-        pass
+        def __init__(self, msg):
+            self.msg = msg

kfet/views.py

@@ -6,7 +6,7 @@ from django.core.urlresolvers import reverse_lazy
 from django.contrib import messages
 from django.contrib.messages.views import SuccessMessageMixin
 from django.contrib.auth.decorators import login_required, permission_required
-from django.contrib.auth.models import User
+from django.contrib.auth.models import User, Permission
 from django.http import HttpResponse, JsonResponse, Http404
 from django.forms import modelformset_factory
 from gestioncof.models import CofProfile, Clipper
@@ -398,7 +398,7 @@ def kpsul_perform_operations(request):
     if not operation_formset.is_valid():
         data['errors'].append({'operations': list(operation_formset.errors) })
 
-    # Returning bad request if errors
+    # Returning BAD REQUEST if errors
     if 'errors' in data:
         return JsonResponse(data, status=400)
 
@@ -410,14 +410,43 @@ def kpsul_perform_operations(request):
     cof_grant = Settings.SUBVENTION_COF()
     cof_grant_divisor = 1 + cof_grant / 100
 
-    # Calculating amount of each PURCHASE operations
-    # and total amount for operation group
+    # Initializing required perms
+    required_perms = []
+
+    # 1. Calculating amount of each PURCHASE operations
+    # 2. and total amount for operation group
+    # 3. Adding required permissions to perform each operation
     for operation in operations:
+        # 1
         if operation.type == Operation.PURCHASE:
             operation.amount = - operation.article.price * operation.article_nb
             if operationgroup.on_acc.is_cof:
                 operation.amount = operation.amount / cof_grant_divisor
+        # 2
         operationgroup.amount += operation.amount
+        # 3
+        if operation.type == Operation.DEPOSIT:
+            required_perms.append('kfet.can_perform_deposit')
+
+
+    # Adding required permissions to perform operation group
+    opegroup_perms = operationgroup.on_acc.perms_to_perform_operation(
+        amount = operationgroup.amount)
+    required_perms += opegroup_perms
+
+    # Checking authenticated user has all perms
+    if not request.user.has_perms(required_perms):
+        # Sending BAD_REQUEST with missing perms
+        missing_perms = \
+            [ Permission.objects.get(codename=codename).name for codename in (
+                (perm.split('.'))[1] for perm in
+                required_perms if not request.user.has_perm(perm)
+            )]
+        data['errors'].append({'missing_perms': missing_perms })
+        return JsonResponse(data, status=400)
+
+    # If 1 perm is required, saving who perform the operations
+    operationgroup.valid_by = request.user.profile.account_kfet
 
     # Filling cof status for statistics
     operationgroup.is_cof = operationgroup.on_acc.is_cof