Merge pull request #27 from Schlabonski/unsubscribe

Add unsubscribe system

jdav_web/jdav_web/urls.py

@@ -28,4 +28,5 @@ urlpatterns += i18n_patterns(
 )
 
 # TODO: django serving from MEDIA_URL should be disabled in production stage
-# see http://stackoverflow.com/questions/5871730/need-a-minimal-django-file-upload-example
+# see
+# http://stackoverflow.com/questions/5871730/need-a-minimal-django-file-upload-example

jdav_web/mailer/mailutils.py

@@ -0,0 +1,33 @@
+from django.core.mail import send_mass_mail, send_mail
+
+
+def send(subject, content, sender, recipicient):
+    send_mail(subject, content, sender, [recipicient])
+
+
+def send_mass(subject, content, sender, recipicients):
+    data = [
+        (subject, content, sender, [recipicient])
+        for recipicient in recipicients]
+    print("sending data", data)
+    send_mass_mail(data)
+
+
+def get_content(content):
+    # TODO: generate right url here
+    url = "localhost:8000/newsletter/unsubscribe"
+    text = "{}\n\nDiese Email wurde über die Webseite der JDAV Ludwigsburg"\
+        " verschickt. Wenn du in Zukunft keine Emails mehr erhalten möchtest,"\
+        " kannst du hier den Newsletter deabonnieren.\n\n{}"\
+        .format(content, url)
+    return text
+
+
+def get_unsubscribe_link(member):
+    key = member.generate_key()
+    print("generating key for", member, key)
+    # TODO: generate right url here
+    return "localhost:8000/newsletter/unsubscribe?key={}".format(key)
+
+
+mail_root = "christian@localhost"

jdav_web/mailer/models.py

@@ -1,6 +1,6 @@
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
-from django.core.mail import send_mass_mail
+from .mailutils import send_mass, get_content
 
 
 # Create your models here.
@@ -29,11 +29,8 @@ class Message(models.Model):
                 if not member.gets_newsletter:
                     continue
                 members.add(member)
-        data = [
+        send_mass(self.subject, get_content(self.content),
-            (self.subject, self.content, self.from_addr, [member.email])
+                       self.from_addr, [member.email for member in members])
-            for member in members
-        ]
-        send_mass_mail(data)
         self.sent = True
         self.save()
 

jdav_web/mailer/templates/mailer/confirmation_sent.html

@@ -0,0 +1,3 @@
+{% load i18n %}
+
+<p>{% trans "Sent confirmation mail to" %} <b>{{ email }}</b>. {% trans "Follow the link in your mail to confirm your unsubscription." %}</p>

jdav_web/mailer/templates/mailer/unsubscribe.html

@@ -0,0 +1,21 @@
+{% load i18n %}
+
+<p><b>{% trans "Here you can unsubscribe from the newsletter" %}</b></p>
+
+{% if error_message %}
+	<p><b>{{ error_message }}</b></p>
+{% endif %}
+
+<form action="" method="post">
+	{% csrf_token %}
+
+	<input type="hidden" name="post" value="yes">
+	<p>
+	{% trans "Email address" %}
+	<input type="email" name="email">
+	</p>
+	
+	<p>
+	<input type="submit" value="{% trans "Unsubscribe" %}">
+	</p>
+</form>

jdav_web/mailer/templates/mailer/unsubscribed.html

@@ -0,0 +1,5 @@
+{% load i18n %}
+
+<p>
+{% trans "Successfully unsubscribed from the newsletter for " %}<b>{{ email }}</b>
+</p>

jdav_web/mailer/urls.py

@@ -5,5 +5,6 @@ from . import views
 app_name = "mailer"
 urlpatterns = [
     url(r'^$', views.index, name='index'),
-    url(r'^subscribe$', views.subscribe, name='subscribe'),
+    # url(r'^subscribe', views.subscribe, name='subscribe'),
+    url(r'^unsubscribe', views.unsubscribe, name='unsubscribe'),
 ]

jdav_web/mailer/views.py

@@ -3,12 +3,54 @@ from django import forms
 from django.utils.translation import ugettext_lazy as _
 from django.urls import reverse
 from django.http import HttpResponseRedirect
+from .mailutils import send as send_mail, mail_root, get_unsubscribe_link
 
 from members.models import Member
 
 
 def index(request):
-    return HttpResponseRedirect(reverse('mailer:subscribe'))
+    return HttpResponseRedirect(reverse('mailer:unsubscribe'))
+
+
+def render_unsubscribe(request, error_message=""):
+    context = {}
+    if error_message:
+        context['error_message'] = error_message
+    return render(request, 'mailer/unsubscribe.html', context)
+
+
+def render_unsubscribed(request, email):
+    return render(request, 'mailer/unsubscribed.html', {'email': email})
+
+
+def unsubscribe(request):
+    if request.method == 'GET' and 'key' in request.GET:
+        try:
+            key = request.GET['key']
+            member = Member.objects.get(unsubscribe_key=key)
+            if not member.unsubscribe(key):
+                raise KeyError
+        except (KeyError, Member.DoesNotExist):
+            return render_unsubscribe(request,
+                                      _("Can't verify this link. Try again!"))
+        else:
+            return render_unsubscribed(request, member.email)
+    elif not request.POST.get('post', False):
+        # just calling up unsubscribe page
+        return render_unsubscribe(request)
+    try:
+        email = request.POST['email']
+        member = Member.objects.filter(email=email).first()
+        if not member:  # member not found
+            raise KeyError
+    except (KeyError, Member.DoesNotExist):
+        return render_unsubscribe(request, _("Please fill in every field"))
+    else:
+        send_mail(_("Confirmation of unsubscription"),
+                  _("Click the link to unsubscribe to the newsletter of"
+                    " the JDAV\n{}".format(get_unsubscribe_link(member))),
+                  mail_root, email)
+        return render_confirmation_sent(request, email)
 
 
 def render_subscribe(request, error_message=""):
@@ -22,6 +64,10 @@ def render_subscribe(request, error_message=""):
     return render(request, 'mailer/subscribe.html', context)
 
 
+def render_confirmation_sent(request, email):
+    return render(request, 'mailer/confirmation_sent.html', {'email': email})
+
+
 def subscribe(request):
     try:
         request.POST['post']
@@ -41,7 +87,8 @@ def subscribe(request):
                                            lastname=lastname)
             if len(exists) > 0:
                 return render_subscribe(request,
-                                        error_message=_("Member already exists"))
+                                        error_message=_("Member "
+                                                        "already exists"))
             member = Member(prename=prename,
                             lastname=lastname,
                             email=email,

jdav_web/members/models.py

@@ -1,6 +1,8 @@
 from datetime import datetime
+import uuid
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
+from django.utils import timezone
 
 
 class Group(models.Model):
@@ -37,12 +39,31 @@ class Member(models.Model):
     group = models.ManyToManyField(Group)
     gets_newsletter = models.BooleanField(_('receives newsletter'),
                                           default=True)
+    unsubscribe_key = models.CharField(max_length=32, default="")
+    unsubscribe_expire = models.DateTimeField(default=timezone.now)
     comments = models.TextField(_('comments'), default='', blank=True)
 
     def __str__(self):
         """String representation"""
         return self.name
 
+    def generate_key(self):
+        self.unsubscribe_key = uuid.uuid4().hex
+        self.unsubscribe_expire = timezone.now() + timezone.timedelta(days=1)
+        self.save()
+        return self.unsubscribe_key
+
+    def unsubscribe(self, key):
+        if self.unsubscribe_key == key and timezone.now() <\
+                self.unsubscribe_expire:
+            for member in Member.objects.filter(email=self.email):
+                member.gets_newsletter = False
+                member.save()
+            self.unsubscribe_key, self.unsubscribe_expire = "", timezone.now()
+            return True
+        else:
+            return False
+
     @property
     def name(self):
         """Returning whole name (prename + lastname)"""