Adding the Terms of Service model

I added two models for ToS system. A first model called `Tos` that
stores the data itself of the policy using a version number and a link
to a PDF version if necessary. The content of the policy should be
written in markdown.
Another model just stores the user and its related ToS version in order
for the user to be able to sign several versions.

I updated the admin to display the information related to the ToS
models.
Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/allgo/main/admin.py

@@ -13,6 +13,8 @@ from .models import (
         Webapp,
         WebappParameter,
         WebappVersion,
+        Tos,
+        UserAgreement,
 )
 
 
@@ -69,3 +71,5 @@ admin.site.register(WebappVersion, WebappVersionAdmin)
 admin.site.register(Job, JobAdmin)
 admin.site.register(AllgoUser)
 admin.site.register(JobQueue)
+admin.site.register(Tos)
+admin.site.register(UserAgreement)

django/allgo/main/models.py

@@ -10,6 +10,7 @@ from django.core.validators import MinLengthValidator, MinValueValidator, \
 from django.db import models
 from django.db.models.signals import post_save
 from django.dispatch import receiver
+from django.shortcuts import redirect
 from taggit.managers import TaggableManager
 from allauth.account.models import EmailAddress
 from allauth.socialaccount.models import SocialAccount
@@ -612,8 +613,38 @@ class Job(TimeStampModel):
         return os.path.join(settings.DATASTORE, str(self.id))
 
 
-    #  def __str__(self):
-    #      return self.webapp
+class Tos(BaseModel):
+    """ The Terms of Service model
+
+    It can contains several version of a same ToS. The current view will always
+    look for the latest version in the model. Check the view if you have any
+    doubt.
+
+    """
+    content = models.TextField(blank=True)
+    url =  models.URLField(blank=True)
+    version = models.DecimalField(default=1.0, decimal_places=2, max_digits=6)
+
+    def __str__(self):
+        return str(self.version)
+
+    class Meta:
+        db_table = "dj_tos"
+
+
+class UserAgreement(BaseModel):
+    """ User agreement model
+
+    Link a user to one or several ToS.
+    """
+    tos = models.ForeignKey('Tos', on_delete=models.CASCADE, related_name='tos')
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user_agreement')
+
+    def __str__(self):
+        return "{0} - {1}".format(self.user, self.tos)
+
+    class Meta:
+        db_table = 'dj_user_agreement'
 
 
 @receiver(post_save, sender=User)