Added blacklist to avoid web spamming against contact form

core/admin.py

@@ -1,5 +1,5 @@
 from django.contrib import admin
-from .models import ContactMessage, Technology
+from .models import ContactMessage, Technology, BlacklistedWord
 
 # Register your models here.
 class ContactMessageAdmin(admin.ModelAdmin):
@@ -14,5 +14,17 @@ def get_readonly_fields(self, request, obj=None):
             defaults = ['name'] + defaults
         return defaults
 
+class BlacklistedWordAdmin(admin.ModelAdmin):
+    readonly_fields = ['created']
+
+    def get_readonly_fields(self, request, obj=None):
+        defaults = super().get_readonly_fields(request, obj=obj)
+        if obj:  # if we are updating an object
+            defaults = ['word'] + defaults
+        return defaults
+
+
+
 admin.site.register(ContactMessage, ContactMessageAdmin)
 admin.site.register(Technology, TechnologyAdmin)
+admin.site.register(BlacklistedWord, BlacklistedWordAdmin)

core/migrations/0004_blacklistedword.py

@@ -0,0 +1,25 @@
+# Generated by Django 4.0.4 on 2022-06-27 13:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0003_remove_technology_updated'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='BlacklistedWord',
+            fields=[
+                ('word', models.CharField(max_length=30, primary_key=True, serialize=False, verbose_name='Word')),
+                ('created', models.DateTimeField(auto_now=True, verbose_name='Created date')),
+            ],
+            options={
+                'verbose_name': 'blacklisted word',
+                'verbose_name_plural': 'blacklisted words',
+                'ordering': ['word'],
+            },
+        ),
+    ]

core/models.py

@@ -25,3 +25,15 @@ class Meta:
 
     def __str__(self):
         return self.name
+
+class BlacklistedWord(models.Model):
+    word = models.CharField(max_length=30, verbose_name="Word", primary_key=True)
+    created = models.DateTimeField(auto_now=True, verbose_name="Created date")
+
+    class Meta:
+        verbose_name = "blacklisted word"
+        verbose_name_plural ="blacklisted words"
+        ordering = ["word"]
+
+    def __str__(self):
+        return self.word

core/views.py

@@ -1,9 +1,13 @@
+import logging
 from django.shortcuts import render, HttpResponse
 from .forms import ContactMessageForm
 from .services.emailService import EmailService
 from .services.telegramService import TelegramService
+from .models import BlacklistedWord
 from django.conf import settings
 
+logger = logging.getLogger(__name__)
+
 # Create your views here.
 def home(request):
     return render(request, "core/home.html")
@@ -18,19 +22,53 @@ def createContactMessage(request):
     if request.method == 'POST':
         form = ContactMessageForm(request.POST)
         if form.is_valid():
-            new_message = form.save()
-            fromEmail = settings.DEFAULT_FROM_EMAIL
-            subject = new_message.name + ', with email (' + new_message.email + ') needs your attention'
-            email_service = EmailService(fromEmail, [fromEmail], subject, new_message.message)
-            email_service.send()
-
-            if email_service.sended:
-                print('Email sended correctly')
-
-            if settings.TG_ACTIVE:
-                tg_service = TelegramService()
-                sent_ok = tg_service.sendContactNotification(new_message.name, new_message.email, new_message.message)
-                if sent_ok:
-                    print('Telegram notification sended correctly')
+
+            # Before send check if message has to be banned
+            blacklist = BlacklistedWord.objects.all()
+            words = request.POST['name'].split() + request.POST['email'].split() + request.POST['message'].split()
+            banned, word, blackWord = _blacklistedWordFound(words, blacklist)
+
+            if not banned:
+                new_message = form.save()
+                fromEmail = settings.DEFAULT_FROM_EMAIL
+                subject = new_message.name + ', with email (' + new_message.email + ') needs your attention'
+
+                email_service = EmailService(fromEmail, [fromEmail], subject, new_message.message)
+                email_service.send()
+
+                if email_service.sended:
+                    print('Email sended correctly')
+
+                if settings.TG_ACTIVE:
+                    tg_service = TelegramService()
+                    sent_ok = tg_service.sendContactNotification(new_message.name, new_message.email, new_message.message)
+                    if sent_ok:
+                        print('Telegram notification sended correctly')
+            else:
+               logger.warning(f'A contact message has been banned, reason: detected a black listed word (w={word},bw={blackWord})') 
 
     return render(request, "core/contact.html")
+
+def _blacklistedWordFound(words: list, blacklistedWords: list):
+    found = False
+    word = ''
+    blackWord = ''
+    i = 0
+
+    while not found and i < len(words):
+
+        word = words[i]
+        j = 0
+
+        while not found and j < len(blacklistedWords):
+
+            blackWord = blacklistedWords[j].word
+            found = _findMatch(word, blackWord)
+            j += 1
+
+        i += 1
+
+    return (found, word, blackWord)
+
+def _findMatch(word: str, blackWord: str):
+    return word.lower().strip() == blackWord.lower().strip()