adding features for social network

backend/requirements.txt

@@ -88,6 +88,8 @@ django-silk[formatting]
 
 yt-dlp
 
+python-magic
+
 weasyprint #tvoření PDFek z html dokumentu + css styly
 
 ## -- MISCELLANEOUS --

backend/social/chat/models.py

@@ -2,6 +2,7 @@ from django.db import models
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.utils import timezone
+from vontor_cz.custom_fields import WebPImageField
 
 class Chat(models.Model):
     owner = models.ForeignKey(
@@ -11,6 +12,11 @@ class Chat(models.Model):
         related_name='owned_chats'
     )
 
+    name = models.CharField(max_length=255, blank=True)
+
+    icon = WebPImageField(upload_to='chat_icons/', null=True, blank=True)
+    banner = WebPImageField(upload_to='chat_banners/', null=True, blank=True)
+    
     members = models.ManyToManyField(
         settings.AUTH_USER_MODEL,
         related_name='chats',
@@ -23,6 +29,15 @@ class Chat(models.Model):
         blank=True
     )
 
+    hub = models.ForeignKey(
+        'pages.Hub',
+        on_delete=models.CASCADE,
+        null=True,
+        blank=True
+    )
+
+    
+
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
 
@@ -44,7 +59,8 @@ class Message(models.Model):
     
     sender = models.ForeignKey(
         settings.AUTH_USER_MODEL,
-        on_delete=models.CASCADE,
+        on_delete=models.SET_NULL,
+        null=True,
         related_name='sent_messages'
     )
 
@@ -68,18 +84,10 @@ class Message(models.Model):
     updated_at = models.DateTimeField(auto_now=True)
 
     def clean(self):
-        # VALIDATION: Ensure sender is actually in the chat
-        # Note: We check self.id to avoid running this on creation if logic depends on M2M
-        # But generally, a sender must be a member.
-        if self.chat and self.sender:
-            if not self.chat.members.filter(id=self.sender.id).exists():
+        if self.chat_id and self.sender_id:
+            if not self.chat.members.filter(id=self.sender_id).exists():
                 raise ValidationError("Sender is not a member of this chat.")
 
-    def save(self, *args, **kwargs):
-        # Optional: Run validation before saving
-        # self.full_clean() 
-        super().save(*args, **kwargs)
-
     # --- HELPER METHODS FOR WEBSOCKETS / VIEWS ---
 
     def edit_content(self, new_text):

backend/social/nápady_nebo_chybějicí.md

@@ -0,0 +1,17 @@
+# Social Feature Ideas
+
+## Hub
+- Hub visibility flag (`is_public`) — private/public hubs
+- Hub owner transfer (current owner passes ownership to another member)
+
+## Chat
+- Chat type field (DM vs group) — enforce 2-member limit on DMs
+- Message soft-delete (`is_deleted` flag) — preserve reply context when a message is removed
+
+## Posts
+- Post reactions/likes — equivalent of MessageReaction but for posts
+- Post comments — a `Comment` model FK-ing to `Post`
+- Upvote/downvote system for posts — reddit style voting with score and sorting by "hotness"
+
+## Users
+- User blocking — affects message/post visibility across all social features

backend/social/pages/models.py

@@ -1,3 +1,50 @@
 from django.db import models
+from django.conf import settings
+from vontor_cz.custom_fields import WebPImageField
 
 # Create your models here.
+
+
+class Hub(models.Model):
+    name = models.CharField(max_length=255, unique=True)
+    description = models.TextField(blank=True, null=True)
+
+    owner = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.SET_NULL,
+        null=True,
+        related_name='owned_hubs'
+    )
+
+    icon = WebPImageField(upload_to='hub_icons/', null=True, blank=True)
+    banner = WebPImageField(upload_to='hub_banners/', null=True, blank=True)
+
+    members = models.ManyToManyField(
+        settings.AUTH_USER_MODEL,
+        related_name='hubs',
+        blank=True
+    )
+
+    #TODO: 
+
+    def __str__(self):
+        return self.name
+    
+class HubPermission(models.Model):
+    hub = models.ForeignKey(Hub, on_delete=models.CASCADE, related_name='moderators')
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
+
+    changing_name = models.BooleanField(default=False)
+    changing_description = models.BooleanField(default=False)
+    changing_icon = models.BooleanField(default=False)
+    changing_banner = models.BooleanField(default=False)
+
+    managing_members = models.BooleanField(default=False)
+    managing_posts = models.BooleanField(default=False)
+    managing_chats = models.BooleanField(default=False)
+
+    class Meta:
+        unique_together = ('hub', 'user')
+
+    def __str__(self):
+        return f"{self.user} moderates {self.hub}"

backend/social/posts/models.py

@@ -1,3 +1,42 @@
 from django.db import models
 
-# Create your models here.
+from django.conf import settings
+import magic
+
+mime = magic.Magic(mime=True)
+
+
+class Post(models.Model):
+    content = models.TextField(blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    author = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name='posts'
+    )
+    
+    hub = models.ForeignKey(
+        'pages.Hub',
+        on_delete=models.CASCADE,
+        null=True,
+        blank=True
+    )
+    
+    def __str__(self):
+        return f"Post {self.id}"
+    
+class PostContent(models.Model):
+    post = models.ForeignKey(Post, related_name='contents', on_delete=models.CASCADE)
+    mime_type = models.CharField(max_length=100)
+    file = models.FileField(upload_to='post_contents/', null=True, blank=True)  # For images/videos
+    alt_text = models.TextField(blank=True, null=True)  # For text content
+
+    def __str__(self):
+        return f"Content for Post {self.post.id} - Type: {self.mime_type}"
+    
+    def save(self, *args, **kwargs):
+        if self.file and not self.file._committed:
+            self.mime_type = mime.from_buffer(self.file.read(1024))
+        return super().save(*args, **kwargs)

backend/vontor_cz/custom_fields.py

@@ -0,0 +1,51 @@
+import os
+from io import BytesIO
+from PIL import Image
+from django.db import models
+from django.core.files.base import ContentFile
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class WebPImageField(models.ImageField):
+    """
+    A custom ImageField that converts uploaded images to WebP automatically.
+
+    Inherits from models.ImageField (description: "Image").
+    Accepts the same arguments:
+        verbose_name, name, upload_to, storage,
+        width_field, height_field, **kwargs
+    """
+
+    def pre_save(self, model_instance, add):
+        file_obj = getattr(model_instance, self.attname)
+
+        if file_obj and not file_obj._committed:
+            self._convert_to_webp(file_obj)
+
+        return super().pre_save(model_instance, add)
+
+    def _convert_to_webp(self, file_obj):
+        try:
+            file_obj.open()
+            image = Image.open(file_obj)
+
+            if image.format == 'WEBP':
+                image.close()
+                return
+
+            if image.mode == 'P':
+                image = image.convert('RGBA')
+            elif image.mode not in ('RGBA', 'LA'):
+                image = image.convert('RGB')
+
+            image_io = BytesIO()
+            image.save(image_io, format='WEBP', quality=85, optimize=True)
+            image.close()
+
+            new_filename = os.path.splitext(file_obj.name)[0] + '.webp'
+            file_obj.save(new_filename, ContentFile(image_io.getvalue()), save=False)
+
+        except Exception as e:
+            logger.error(f"WebP conversion failed: {e}")