Update multipart_downloader.py

src/core/workers.py

@@ -410,6 +410,39 @@ class PostProcessorWorker:
         unique_id_for_part_file = uuid.uuid4().hex[:8]
         unique_part_file_stem_on_disk = f"{temp_file_base_for_unique_part}_{unique_id_for_part_file}"
         max_retries = 3
+        if not self.keep_in_post_duplicates:
+            final_save_path_check = os.path.join(target_folder_path, filename_to_save_in_main_path)
+            if os.path.exists(final_save_path_check):
+                try:
+                    # Use a HEAD request to get the expected size without downloading the body
+                    with requests.head(file_url, headers=headers, timeout=15, cookies=cookies_to_use_for_file, allow_redirects=True) as head_response:
+                        head_response.raise_for_status()
+                        expected_size = int(head_response.headers.get('Content-Length', -1))
+                    
+                    actual_size = os.path.getsize(final_save_path_check)
+
+                    if expected_size != -1 and actual_size == expected_size:
+                        self.logger(f"   -> Skip (File Exists & Complete): '{filename_to_save_in_main_path}' is already on disk with the correct size.")
+                        
+                        # We still need to add its hash to the session to prevent duplicates in other modes
+                        # This is a quick hash calculation for the already existing file
+                        try:
+                            md5_hasher = hashlib.md5()
+                            with open(final_save_path_check, 'rb') as f_verify:
+                                for chunk in iter(lambda: f_verify.read(8192), b""):
+                                    md5_hasher.update(chunk)
+                            
+                            with self.downloaded_hash_counts_lock:
+                                self.downloaded_hash_counts[md5_hasher.hexdigest()] += 1
+                        except Exception as hash_exc:
+                             self.logger(f"   ⚠️ Could not hash existing file '{filename_to_save_in_main_path}' for session: {hash_exc}")
+
+                        return 0, 1, filename_to_save_in_main_path, was_original_name_kept_flag, FILE_DOWNLOAD_STATUS_SKIPPED, None
+                    else:
+                        self.logger(f"   ⚠️ File '{filename_to_save_in_main_path}' exists but is incomplete (Expected: {expected_size}, Actual: {actual_size}). Re-downloading.")
+
+                except requests.RequestException as e:
+                    self.logger(f"   ⚠️ Could not verify size of existing file '{filename_to_save_in_main_path}': {e}. Proceeding with download.")
         retry_delay = 5
         downloaded_size_bytes = 0
         calculated_file_hash = None
@@ -741,8 +774,11 @@ class PostProcessorWorker:
             history_data_for_this_post = None
 
             parsed_api_url = urlparse(self.api_url_input)
-            referer_url = f"https://{parsed_api_url.netloc}/"
-            headers = {'User-Agent': 'Mozilla/5.0', 'Referer': referer_url, 'Accept': '*/*'}
+            post_data = self.post
+            post_id = post_data.get('id', 'unknown_id')
+
+            post_page_url = f"https://{parsed_api_url.netloc}/{self.service}/user/{self.user_id}/post/{post_id}"
+            headers = {'User-Agent': 'Mozilla/5.0', 'Referer': post_page_url, 'Accept': '*/*'}
             link_pattern = re.compile(r"""<a\s+.*?href=["'](https?://[^"']+)["'][^>]*>(.*?)</a>""", re.IGNORECASE | re.DOTALL)
             post_data = self.post
             post_title = post_data.get('title', '') or 'untitled_post'
@@ -802,7 +838,7 @@ class PostProcessorWorker:
             all_files_from_post_api_for_char_check = []
             api_file_domain_for_char_check = urlparse(self.api_url_input).netloc
             if not api_file_domain_for_char_check or not any(d in api_file_domain_for_char_check.lower() for d in ['kemono.su', 'kemono.party', 'kemono.cr', 'coomer.su', 'coomer.party', 'coomer.st']):
-                api_file_domain_for_char_check = "kemono.su" if "kemono" in self.service.lower() else "coomer.st"
+                api_file_domain_for_char_check = "kemono.cr" if "kemono" in self.service.lower() else "coomer.st"
             if post_main_file_info and isinstance(post_main_file_info, dict) and post_main_file_info.get('path'):
                 original_api_name = post_main_file_info.get('name') or os.path.basename(post_main_file_info['path'].lstrip('/'))
                 if original_api_name:
@@ -845,9 +881,9 @@ class PostProcessorWorker:
                     try:
                         parsed_input_url_for_comments = urlparse(self.api_url_input)
                         api_domain_for_comments = parsed_input_url_for_comments.netloc
-                        if not any(d in api_domain_for_comments.lower() for d in ['kemono.su', 'kemono.party', 'coomer.su', 'coomer.party']):
+                        if not any(d in api_domain_for_comments.lower() for d in ['kemono.su', 'kemono.party', 'kemono.cr', 'coomer.su', 'coomer.party', 'coomer.st']):
                             self.logger(f"⚠️ Unrecognized domain '{api_domain_for_comments}' for comment API. Defaulting based on service.")
-                            api_domain_for_comments = "kemono.su" if "kemono" in self.service.lower() else "coomer.party"
+                            api_domain_for_comments = "kemono.cr" if "kemono" in self.service.lower() else "coomer.st"
                         comments_data = fetch_post_comments(
                             api_domain_for_comments, self.service, self.user_id, post_id,
                             headers, self.logger, self.cancellation_event, self.pause_event,
@@ -1332,7 +1368,7 @@ class PostProcessorWorker:
             all_files_from_post_api = []
             api_file_domain = urlparse(self.api_url_input).netloc
             if not api_file_domain or not any(d in api_file_domain.lower() for d in ['kemono.su', 'kemono.party', 'kemono.cr', 'coomer.su', 'coomer.party', 'coomer.st']):
-                api_file_domain = "kemono.su" if "kemono" in self.service.lower() else "coomer.st"
+                api_file_domain = "kemono.cr" if "kemono" in self.service.lower() else "coomer.st"
             if post_main_file_info and isinstance(post_main_file_info, dict) and post_main_file_info.get('path'):
                 file_path = post_main_file_info['path'].lstrip('/')
                 original_api_name = post_main_file_info.get('name') or os.path.basename(file_path)

src/services/multipart_downloader.py

@@ -1,4 +1,5 @@
 # --- Standard Library Imports ---
+# --- Standard Library Imports ---
 import os
 import time
 import hashlib
@@ -10,27 +11,49 @@ from concurrent.futures import ThreadPoolExecutor, as_completed
 
 # --- Third-Party Library Imports ---
 import requests
+MULTIPART_DOWNLOADER_AVAILABLE = True
 
 # --- Module Constants ---
 CHUNK_DOWNLOAD_RETRY_DELAY = 2
 MAX_CHUNK_DOWNLOAD_RETRIES = 1
 DOWNLOAD_CHUNK_SIZE_ITER = 1024 * 256  # 256 KB per iteration chunk
 
-# Flag to indicate if this module and its dependencies are available.
-MULTIPART_DOWNLOADER_AVAILABLE = True
-
 
 def _download_individual_chunk(
-    chunk_url, temp_file_path, start_byte, end_byte, headers,
+    chunk_url, chunk_temp_file_path, start_byte, end_byte, headers,
     part_num, total_parts, progress_data, cancellation_event,
     skip_event, pause_event, global_emit_time_ref, cookies_for_chunk,
     logger_func, emitter=None, api_original_filename=None
 ):
     """
-    Downloads a single segment (chunk) of a larger file. This function is
-    intended to be run in a separate thread by a ThreadPoolExecutor.
+    Downloads a single segment (chunk) of a larger file to its own unique part file.
+    This function is intended to be run in a separate thread by a ThreadPoolExecutor.
 
-    It handles retries, pauses, and cancellations for its specific chunk.
+    It handles retries, pauses, and cancellations for its specific chunk. If a
+    download fails, the partial chunk file is removed, allowing a clean retry later.
+
+    Args:
+        chunk_url (str): The URL to download the file from.
+        chunk_temp_file_path (str): The unique path to save this specific chunk
+                                    (e.g., 'my_video.mp4.part0').
+        start_byte (int): The starting byte for the Range header.
+        end_byte (int): The ending byte for the Range header.
+        headers (dict): The HTTP headers to use for the request.
+        part_num (int): The index of this chunk (e.g., 0 for the first part).
+        total_parts (int): The total number of chunks for the entire file.
+        progress_data (dict): A thread-safe dictionary for sharing progress.
+        cancellation_event (threading.Event): Event to signal cancellation.
+        skip_event (threading.Event): Event to signal skipping the file.
+        pause_event (threading.Event): Event to signal pausing the download.
+        global_emit_time_ref (list): A mutable list with one element (a timestamp)
+                                     to rate-limit UI updates.
+        cookies_for_chunk (dict): Cookies to use for the request.
+        logger_func (function): A function to log messages.
+        emitter (queue.Queue or QObject): Emitter for sending progress to the UI.
+        api_original_filename (str): The original filename for UI display.
+
+    Returns:
+        tuple: A tuple containing (bytes_downloaded, success_flag).
     """
     # --- Pre-download checks for control events ---
     if cancellation_event and cancellation_event.is_set():
@@ -48,18 +71,16 @@ def _download_individual_chunk(
             time.sleep(0.2)
         logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Download resumed.")
 
-    # --- START: FIX ---
     # Set this chunk's status to 'active' before starting the download.
     with progress_data['lock']:
         progress_data['chunks_status'][part_num]['active'] = True
-    # --- END: FIX ---
 
     try:
         # Prepare headers for the specific byte range of this chunk
         chunk_headers = headers.copy()
         if end_byte != -1:
             chunk_headers['Range'] = f"bytes={start_byte}-{end_byte}"
-        
+
         bytes_this_chunk = 0
         last_speed_calc_time = time.time()
         bytes_at_last_speed_calc = 0
@@ -77,13 +98,14 @@ def _download_individual_chunk(
                     bytes_at_last_speed_calc = bytes_this_chunk
 
                 logger_func(f"   🚀 [Chunk {part_num + 1}/{total_parts}] Starting download: bytes {start_byte}-{end_byte if end_byte != -1 else 'EOF'}")
-                
+
                 response = requests.get(chunk_url, headers=chunk_headers, timeout=(10, 120), stream=True, cookies=cookies_for_chunk)
                 response.raise_for_status()
 
                 # --- Data Writing Loop ---
-                with open(temp_file_path, 'r+b') as f:
-                    f.seek(start_byte)
+                # We open the unique chunk file in write-binary ('wb') mode.
+                # No more seeking is required.
+                with open(chunk_temp_file_path, 'wb') as f:
                     for data_segment in response.iter_content(chunk_size=DOWNLOAD_CHUNK_SIZE_ITER):
                         if cancellation_event and cancellation_event.is_set():
                             return bytes_this_chunk, False
@@ -98,12 +120,12 @@ def _download_individual_chunk(
                         if data_segment:
                             f.write(data_segment)
                             bytes_this_chunk += len(data_segment)
-                            
+
                             # Update shared progress data structure
                             with progress_data['lock']:
                                 progress_data['total_downloaded_so_far'] += len(data_segment)
                                 progress_data['chunks_status'][part_num]['downloaded'] = bytes_this_chunk
-                                
+
                                 # Calculate and update speed for this chunk
                                 current_time = time.time()
                                 time_delta = current_time - last_speed_calc_time
@@ -113,7 +135,7 @@ def _download_individual_chunk(
                                     progress_data['chunks_status'][part_num]['speed_bps'] = current_speed_bps
                                     last_speed_calc_time = current_time
                                     bytes_at_last_speed_calc = bytes_this_chunk
-                                
+
                                 # Emit progress signal to the UI via the queue
                                 if emitter and (current_time - global_emit_time_ref[0] > 0.25):
                                     global_emit_time_ref[0] = current_time
@@ -122,7 +144,8 @@ def _download_individual_chunk(
                                         emitter.put({'type': 'file_progress', 'payload': (api_original_filename, status_list_copy)})
                                     elif hasattr(emitter, 'file_progress_signal'):
                                         emitter.file_progress_signal.emit(api_original_filename, status_list_copy)
-                
+
+                # If we get here, the download for this chunk is successful
                 return bytes_this_chunk, True
 
             except (requests.exceptions.ConnectionError, requests.exceptions.Timeout, http.client.IncompleteRead) as e:
@@ -134,8 +157,10 @@ def _download_individual_chunk(
                 logger_func(f"   ❌ [Chunk {part_num + 1}/{total_parts}] Unexpected error: {e}\n{traceback.format_exc(limit=1)}")
                 return bytes_this_chunk, False
 
+        # If the retry loop finishes without a successful download
         return bytes_this_chunk, False
     finally:
+        # This block runs whether the download succeeded or failed
         with progress_data['lock']:
             progress_data['chunks_status'][part_num]['active'] = False
             progress_data['chunks_status'][part_num]['speed_bps'] = 0.0
@@ -144,17 +169,37 @@ def _download_individual_chunk(
 def download_file_in_parts(file_url, save_path, total_size, num_parts, headers, api_original_filename,
                            emitter_for_multipart, cookies_for_chunk_session,
                            cancellation_event, skip_event, logger_func, pause_event):
-    logger_func(f"⬇️ Initializing Multi-part Download ({num_parts} parts) for: '{api_original_filename}' (Size: {total_size / (1024*1024):.2f} MB)")
-    temp_file_path = save_path + ".part"
+    """
+    Manages a resilient, multipart file download by saving each chunk to a separate file.
 
-    try:
-        with open(temp_file_path, 'wb') as f_temp:
-            if total_size > 0:
-                f_temp.truncate(total_size)
-    except IOError as e:
-        logger_func(f"   ❌ Error creating/truncating temp file '{temp_file_path}': {e}")
-        return False, 0, None, None
+    This function orchestrates the download process by:
+    1. Checking for already completed chunk files to resume a previous download.
+    2. Submitting only the missing chunks to a thread pool for parallel download.
+    3. Assembling the final file from the individual chunks upon successful completion.
+    4. Cleaning up temporary chunk files after assembly.
+    5. Leaving completed chunks on disk if the download fails, allowing for a future resume.
 
+    Args:
+        file_url (str): The URL of the file to download.
+        save_path (str): The final desired path for the downloaded file (e.g., 'my_video.mp4').
+        total_size (int): The total size of the file in bytes.
+        num_parts (int): The number of parts to split the download into.
+        headers (dict): HTTP headers for the download requests.
+        api_original_filename (str): The original filename for UI progress display.
+        emitter_for_multipart (queue.Queue or QObject): Emitter for UI signals.
+        cookies_for_chunk_session (dict): Cookies for the download requests.
+        cancellation_event (threading.Event): Event to signal cancellation.
+        skip_event (threading.Event): Event to signal skipping the file.
+        logger_func (function): A function for logging messages.
+        pause_event (threading.Event): Event to signal pausing the download.
+
+    Returns:
+        tuple: A tuple containing (success_flag, total_bytes_downloaded, md5_hash, file_handle).
+               The file_handle will be for the final assembled file if successful, otherwise None.
+    """
+    logger_func(f"⬇️ Initializing Resumable Multi-part Download ({num_parts} parts) for: '{api_original_filename}' (Size: {total_size / (1024*1024):.2f} MB)")
+
+    # Calculate the byte range for each chunk
     chunk_size_calc = total_size // num_parts
     chunks_ranges = []
     for i in range(num_parts):
@@ -162,76 +207,119 @@ def download_file_in_parts(file_url, save_path, total_size, num_parts, headers,
         end = start + chunk_size_calc - 1 if i < num_parts - 1 else total_size - 1
         if start <= end:
             chunks_ranges.append((start, end))
-        elif total_size == 0 and i == 0:
+        elif total_size == 0 and i == 0: # Handle zero-byte files
             chunks_ranges.append((0, -1))
 
+    # Calculate the expected size of each chunk
     chunk_actual_sizes = []
     for start, end in chunks_ranges:
-        if end == -1 and start == 0:
-            chunk_actual_sizes.append(0)
-        else:
-            chunk_actual_sizes.append(end - start + 1)
+        chunk_actual_sizes.append(end - start + 1 if end != -1 else 0)
 
     if not chunks_ranges and total_size > 0:
-        logger_func(f"   ⚠️ No valid chunk ranges for multipart download of '{api_original_filename}'. Aborting multipart.")
-        if os.path.exists(temp_file_path): os.remove(temp_file_path)
+        logger_func(f"   ⚠️ No valid chunk ranges for multipart download of '{api_original_filename}'. Aborting.")
         return False, 0, None, None
 
+    # --- Resumption Logic: Check for existing complete chunks ---
+    chunks_to_download = []
+    total_bytes_resumed = 0
+    for i, (start, end) in enumerate(chunks_ranges):
+        chunk_part_path = f"{save_path}.part{i}"
+        expected_chunk_size = chunk_actual_sizes[i]
+
+        if os.path.exists(chunk_part_path) and os.path.getsize(chunk_part_path) == expected_chunk_size:
+            logger_func(f"   [Chunk {i + 1}/{num_parts}] Resuming with existing complete chunk file.")
+            total_bytes_resumed += expected_chunk_size
+        else:
+            chunks_to_download.append({'index': i, 'start': start, 'end': end})
+
+    # Setup the shared progress data structure
     progress_data = {
         'total_file_size': total_size,
-        'total_downloaded_so_far': 0,
-        'chunks_status': [
-            {'id': i, 'downloaded': 0, 'total': chunk_actual_sizes[i] if i < len(chunk_actual_sizes) else 0, 'active': False, 'speed_bps': 0.0}
-            for i in range(num_parts)
-        ],
+        'total_downloaded_so_far': total_bytes_resumed,
+        'chunks_status': [],
         'lock': threading.Lock(),
         'last_global_emit_time': [time.time()]
     }
+    for i in range(num_parts):
+        is_resumed = not any(c['index'] == i for c in chunks_to_download)
+        progress_data['chunks_status'].append({
+            'id': i,
+            'downloaded': chunk_actual_sizes[i] if is_resumed else 0,
+            'total': chunk_actual_sizes[i],
+            'active': False,
+            'speed_bps': 0.0
+        })
 
+    # --- Download Phase ---
     chunk_futures = []
     all_chunks_successful = True
-    total_bytes_from_chunks = 0
+    total_bytes_from_threads = 0
 
     with ThreadPoolExecutor(max_workers=num_parts, thread_name_prefix=f"MPChunk_{api_original_filename[:10]}_") as chunk_pool:
-        for i, (start, end) in enumerate(chunks_ranges):
-            if cancellation_event and cancellation_event.is_set(): all_chunks_successful = False; break
-            chunk_futures.append(chunk_pool.submit(
-                _download_individual_chunk, chunk_url=file_url, temp_file_path=temp_file_path,
+        for chunk_info in chunks_to_download:
+            if cancellation_event and cancellation_event.is_set():
+                all_chunks_successful = False
+                break
+            
+            i, start, end = chunk_info['index'], chunk_info['start'], chunk_info['end']
+            chunk_part_path = f"{save_path}.part{i}"
+            
+            future = chunk_pool.submit(
+                _download_individual_chunk,
+                chunk_url=file_url,
+                chunk_temp_file_path=chunk_part_path,
                 start_byte=start, end_byte=end, headers=headers, part_num=i, total_parts=num_parts,
-                progress_data=progress_data, cancellation_event=cancellation_event, skip_event=skip_event, global_emit_time_ref=progress_data['last_global_emit_time'],
-                pause_event=pause_event, cookies_for_chunk=cookies_for_chunk_session, logger_func=logger_func, emitter=emitter_for_multipart,
+                progress_data=progress_data, cancellation_event=cancellation_event,
+                skip_event=skip_event, global_emit_time_ref=progress_data['last_global_emit_time'],
+                pause_event=pause_event, cookies_for_chunk=cookies_for_chunk_session,
+                logger_func=logger_func, emitter=emitter_for_multipart,
                 api_original_filename=api_original_filename
-            ))
+            )
+            chunk_futures.append(future)
 
         for future in as_completed(chunk_futures):
-            if cancellation_event and cancellation_event.is_set(): all_chunks_successful = False; break
-            bytes_downloaded_this_chunk, success_this_chunk = future.result()
-            total_bytes_from_chunks += bytes_downloaded_this_chunk
-            if not success_this_chunk:
+            if cancellation_event and cancellation_event.is_set():
                 all_chunks_successful = False
+            bytes_downloaded, success = future.result()
+            total_bytes_from_threads += bytes_downloaded
+            if not success:
+                all_chunks_successful = False
+
+    total_bytes_final = total_bytes_resumed + total_bytes_from_threads
 
     if cancellation_event and cancellation_event.is_set():
         logger_func(f"   Multi-part download for '{api_original_filename}' cancelled by main event.")
         all_chunks_successful = False
-    if emitter_for_multipart:
-        with progress_data['lock']:
-            status_list_copy = [dict(s) for s in progress_data['chunks_status']]
-            if isinstance(emitter_for_multipart, queue.Queue):
-                emitter_for_multipart.put({'type': 'file_progress', 'payload': (api_original_filename, status_list_copy)})
-            elif hasattr(emitter_for_multipart, 'file_progress_signal'):
-                emitter_for_multipart.file_progress_signal.emit(api_original_filename, status_list_copy)
 
-    if all_chunks_successful and (total_bytes_from_chunks == total_size or total_size == 0):
-        logger_func(f"   ✅ Multi-part download successful for '{api_original_filename}'. Total bytes: {total_bytes_from_chunks}")
+    # --- Assembly and Cleanup Phase ---
+    if all_chunks_successful and (total_bytes_final == total_size or total_size == 0):
+        logger_func(f"   ✅ All {num_parts} chunks complete. Assembling final file...")
         md5_hasher = hashlib.md5()
-        with open(temp_file_path, 'rb') as f_hash:
-            for buf in iter(lambda: f_hash.read(4096*10), b''):
-                md5_hasher.update(buf)
-        calculated_hash = md5_hasher.hexdigest()
-        return True, total_bytes_from_chunks, calculated_hash, open(temp_file_path, 'rb')
+        try:
+            with open(save_path, 'wb') as final_file:
+                for i in range(num_parts):
+                    chunk_part_path = f"{save_path}.part{i}"
+                    with open(chunk_part_path, 'rb') as chunk_file:
+                        content = chunk_file.read()
+                        final_file.write(content)
+                        md5_hasher.update(content)
+            
+            calculated_hash = md5_hasher.hexdigest()
+            logger_func(f"   ✅ Assembly successful for '{api_original_filename}'. Total bytes: {total_bytes_final}")
+            return True, total_bytes_final, calculated_hash, open(save_path, 'rb')
+        except Exception as e:
+            logger_func(f"   ❌ Critical error during file assembly: {e}. Cleaning up.")
+            return False, total_bytes_final, None, None
+        finally:
+            # Cleanup all individual chunk files after successful assembly
+            for i in range(num_parts):
+                chunk_part_path = f"{save_path}.part{i}"
+                if os.path.exists(chunk_part_path):
+                    try:
+                        os.remove(chunk_part_path)
+                    except OSError as e:
+                        logger_func(f"    ⚠️ Failed to remove temp part file '{chunk_part_path}': {e}")
     else:
-        logger_func(f"   ❌ Multi-part download failed for '{api_original_filename}'. Success: {all_chunks_successful}, Bytes: {total_bytes_from_chunks}/{total_size}. Cleaning up.")
-        if os.path.exists(temp_file_path):
-            try: os.remove(temp_file_path)
-            except OSError as e: logger_func(f"    Failed to remove temp part file '{temp_file_path}': {e}")
-        return False, total_bytes_from_chunks, None, None
+        # If download failed, we do NOT clean up, allowing for resumption later
+        logger_func(f"   ❌ Multi-part download failed for '{api_original_filename}'. Success: {all_chunks_successful}, Bytes: {total_bytes_final}/{total_size}. Partial chunks saved for future resumption.")
+        return False, total_bytes_final, None, None

src/ui/dialogs/FavoriteArtistsDialog.py

@@ -37,13 +37,13 @@ class FavoriteArtistsDialog (QDialog ):
         self ._init_ui ()
         self ._fetch_favorite_artists ()
 
-    def _get_domain_for_service (self ,service_name ):
-        service_lower =service_name .lower ()
-        coomer_primary_services ={'onlyfans','fansly','manyvids','candfans'}
-        if service_lower in coomer_primary_services :
-            return "coomer.su"
-        else :
-            return "kemono.su"
+    def _get_domain_for_service(self, service_name):
+        service_lower = service_name.lower()
+        coomer_primary_services = {'onlyfans', 'fansly', 'manyvids', 'candfans'}
+        if service_lower in coomer_primary_services:
+            return "coomer.st"  # Use the new domain
+        else:
+            return "kemono.cr"   # Use the new domain
 
     def _tr (self ,key ,default_text =""):
         """Helper to get translation based on current app language."""
@@ -128,9 +128,29 @@ class FavoriteArtistsDialog (QDialog ):
     def _fetch_favorite_artists (self ):
 
         if self.cookies_config['use_cookie']:
-            # Check if we can load cookies for at least one of the services.
-            kemono_cookies = prepare_cookies_for_request(True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'], self.cookies_config['app_base_dir'], self._logger, target_domain="kemono.su")
-            coomer_cookies = prepare_cookies_for_request(True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'], self.cookies_config['app_base_dir'], self._logger, target_domain="coomer.su")
+            # --- Kemono Check with Fallback ---
+            kemono_cookies = prepare_cookies_for_request(
+                True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                self.cookies_config['app_base_dir'], self._logger, target_domain="kemono.cr"
+            )
+            if not kemono_cookies:
+                self._logger("No cookies for kemono.cr, trying fallback kemono.su...")
+                kemono_cookies = prepare_cookies_for_request(
+                    True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'], self._logger, target_domain="kemono.su"
+                )
+
+            # --- Coomer Check with Fallback ---
+            coomer_cookies = prepare_cookies_for_request(
+                True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                self.cookies_config['app_base_dir'], self._logger, target_domain="coomer.st"
+            )
+            if not coomer_cookies:
+                self._logger("No cookies for coomer.st, trying fallback coomer.su...")
+                coomer_cookies = prepare_cookies_for_request(
+                    True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'], self._logger, target_domain="coomer.su"
+                )
 
             if not kemono_cookies and not coomer_cookies:
                 # If cookies are enabled but none could be loaded, show help and stop.
@@ -139,7 +159,7 @@ class FavoriteArtistsDialog (QDialog ):
                 cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
                 cookie_help_dialog.exec_()
                 self.download_button.setEnabled(False)
-                return # Stop further execution
+                return  # Stop further execution
 
         kemono_fav_url ="https://kemono.su/api/v1/account/favorites?type=artist"
         coomer_fav_url ="https://coomer.su/api/v1/account/favorites?type=artist"
@@ -149,9 +169,12 @@ class FavoriteArtistsDialog (QDialog ):
         errors_occurred =[]
         any_cookies_loaded_successfully_for_any_source =False 
 
-        api_sources =[
-        {"name":"Kemono.su","url":kemono_fav_url ,"domain":"kemono.su"},
-        {"name":"Coomer.su","url":coomer_fav_url ,"domain":"coomer.su"}
+        kemono_cr_fav_url = "https://kemono.cr/api/v1/account/favorites?type=artist"
+        coomer_st_fav_url = "https://coomer.st/api/v1/account/favorites?type=artist"
+
+        api_sources = [
+            {"name": "Kemono.cr", "url": kemono_cr_fav_url, "domain": "kemono.cr"},
+            {"name": "Coomer.st", "url": coomer_st_fav_url, "domain": "coomer.st"}
         ]
 
         for source in api_sources :
@@ -159,20 +182,41 @@ class FavoriteArtistsDialog (QDialog ):
             self .status_label .setText (self ._tr ("fav_artists_loading_from_source_status","⏳ Loading favorites from {source_name}...").format (source_name =source ['name']))
             QCoreApplication .processEvents ()
 
-            cookies_dict_for_source =None 
-            if self .cookies_config ['use_cookie']:
-                cookies_dict_for_source =prepare_cookies_for_request (
-                True ,
-                self .cookies_config ['cookie_text'],
-                self .cookies_config ['selected_cookie_file'],
-                self .cookies_config ['app_base_dir'],
-                self ._logger ,
-                target_domain =source ['domain']
+            cookies_dict_for_source = None
+            if self.cookies_config['use_cookie']:
+                primary_domain = source['domain']
+                fallback_domain = None
+                if primary_domain == "kemono.cr":
+                    fallback_domain = "kemono.su"
+                elif primary_domain == "coomer.st":
+                    fallback_domain = "coomer.su"
+
+                # First, try the primary domain
+                cookies_dict_for_source = prepare_cookies_for_request(
+                    True,
+                    self.cookies_config['cookie_text'],
+                    self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'],
+                    self._logger,
+                    target_domain=primary_domain
                 )
-                if cookies_dict_for_source :
-                    any_cookies_loaded_successfully_for_any_source =True 
-                else :
-                    self ._logger (f"Warning ({source ['name']}): Cookies enabled but could not be loaded for this domain. Fetch might fail if cookies are required.")
+
+                # If no cookies found, try the fallback domain
+                if not cookies_dict_for_source and fallback_domain:
+                    self._logger(f"Warning ({source['name']}): No cookies found for '{primary_domain}'. Trying fallback '{fallback_domain}'...")
+                    cookies_dict_for_source = prepare_cookies_for_request(
+                        True,
+                        self.cookies_config['cookie_text'],
+                        self.cookies_config['selected_cookie_file'],
+                        self.cookies_config['app_base_dir'],
+                        self._logger,
+                        target_domain=fallback_domain
+                    )
+                
+                if cookies_dict_for_source:
+                    any_cookies_loaded_successfully_for_any_source = True
+                else:
+                    self._logger(f"Warning ({source['name']}): Cookies enabled but could not be loaded for this source (including fallbacks). Fetch might fail.")
             try :
                 headers ={'User-Agent':'Mozilla/5.0'}
                 response =requests .get (source ['url'],headers =headers ,cookies =cookies_dict_for_source ,timeout =20 )
@@ -223,7 +267,7 @@ class FavoriteArtistsDialog (QDialog ):
         if self .cookies_config ['use_cookie']and not any_cookies_loaded_successfully_for_any_source :
             self .status_label .setText (self ._tr ("fav_artists_cookies_required_status","Error: Cookies enabled but could not be loaded for any source."))
             self ._logger ("Error: Cookies enabled but no cookies loaded for any source. Showing help dialog.")
-            cookie_help_dialog =CookieHelpDialog (self )
+            cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
             cookie_help_dialog .exec_ ()
             self .download_button .setEnabled (False )
             if not fetched_any_successfully :

src/ui/dialogs/FavoritePostsDialog.py

@@ -34,28 +34,30 @@ class FavoritePostsFetcherThread (QThread ):
         self .target_domain_preference =target_domain_preference 
         self .cancellation_event =threading .Event ()
         self .error_key_map ={
-        "Kemono.su":"kemono_su",
-        "Coomer.su":"coomer_su"
+        "kemono.cr":"kemono_su",
+        "coomer.st":"coomer_su"
         }
 
     def _logger (self ,message ):
         self .parent_logger_func (f"[FavPostsFetcherThread] {message }")
 
-    def run (self ):
-        kemono_fav_posts_url ="https://kemono.su/api/v1/account/favorites?type=post"
-        coomer_fav_posts_url ="https://coomer.su/api/v1/account/favorites?type=post"
+    def run(self):
+        kemono_su_fav_posts_url = "https://kemono.su/api/v1/account/favorites?type=post"
+        coomer_su_fav_posts_url = "https://coomer.su/api/v1/account/favorites?type=post"
+        kemono_cr_fav_posts_url = "https://kemono.cr/api/v1/account/favorites?type=post"
+        coomer_st_fav_posts_url = "https://coomer.st/api/v1/account/favorites?type=post"
 
-        all_fetched_posts_temp =[]
-        error_messages_for_summary =[]
-        fetched_any_successfully =False 
-        any_cookies_loaded_successfully_for_any_source =False 
+        all_fetched_posts_temp = []
+        error_messages_for_summary = []
+        fetched_any_successfully = False
+        any_cookies_loaded_successfully_for_any_source = False
 
-        self .status_update .emit ("key_fetching_fav_post_list_init")
-        self .progress_bar_update .emit (0 ,0 )
+        self.status_update.emit("key_fetching_fav_post_list_init")
+        self.progress_bar_update.emit(0, 0)
 
-        api_sources =[
-        {"name":"Kemono.su","url":kemono_fav_posts_url ,"domain":"kemono.su"},
-        {"name":"Coomer.su","url":coomer_fav_posts_url ,"domain":"coomer.su"}
+        api_sources = [
+            {"name": "Kemono.cr", "url": kemono_cr_fav_posts_url, "domain": "kemono.cr"},
+            {"name": "Coomer.st", "url": coomer_st_fav_posts_url, "domain": "coomer.st"}
         ]
 
         api_sources_to_try =[]
@@ -76,20 +78,41 @@ class FavoritePostsFetcherThread (QThread ):
             if self .cancellation_event .is_set ():
                 self .finished .emit ([],"KEY_FETCH_CANCELLED_DURING")
                 return 
-            cookies_dict_for_source =None 
-            if self .cookies_config ['use_cookie']:
-                cookies_dict_for_source =prepare_cookies_for_request (
-                True ,
-                self .cookies_config ['cookie_text'],
-                self .cookies_config ['selected_cookie_file'],
-                self .cookies_config ['app_base_dir'],
-                self ._logger ,
-                target_domain =source ['domain']
+            cookies_dict_for_source = None
+            if self.cookies_config['use_cookie']:
+                primary_domain = source['domain']
+                fallback_domain = None
+                if primary_domain == "kemono.cr":
+                    fallback_domain = "kemono.su"
+                elif primary_domain == "coomer.st":
+                    fallback_domain = "coomer.su"
+
+                # First, try the primary domain
+                cookies_dict_for_source = prepare_cookies_for_request(
+                    True,
+                    self.cookies_config['cookie_text'],
+                    self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'],
+                    self._logger,
+                    target_domain=primary_domain
                 )
-                if cookies_dict_for_source :
-                    any_cookies_loaded_successfully_for_any_source =True 
-                else :
-                    self ._logger (f"Warning ({source ['name']}): Cookies enabled but could not be loaded for this domain. Fetch might fail if cookies are required.")
+
+                # If no cookies found, try the fallback domain
+                if not cookies_dict_for_source and fallback_domain:
+                    self._logger(f"Warning ({source['name']}): No cookies found for '{primary_domain}'. Trying fallback '{fallback_domain}'...")
+                    cookies_dict_for_source = prepare_cookies_for_request(
+                        True,
+                        self.cookies_config['cookie_text'],
+                        self.cookies_config['selected_cookie_file'],
+                        self.cookies_config['app_base_dir'],
+                        self._logger,
+                        target_domain=fallback_domain
+                    )
+
+                if cookies_dict_for_source:
+                    any_cookies_loaded_successfully_for_any_source = True
+                else:
+                    self._logger(f"Warning ({source['name']}): Cookies enabled but could not be loaded for this domain. Fetch might fail if cookies are required.")
 
             self ._logger (f"Attempting to fetch favorite posts from: {source ['name']} ({source ['url']})")
             source_key_part =self .error_key_map .get (source ['name'],source ['name'].lower ().replace ('.','_'))
@@ -409,14 +432,14 @@ class FavoritePostsDialog (QDialog ):
             if status_key .startswith ("KEY_COOKIES_REQUIRED_BUT_NOT_FOUND_FOR_DOMAIN_")or status_key =="KEY_COOKIES_REQUIRED_BUT_NOT_FOUND_GENERIC":
                 status_label_text_key ="fav_posts_cookies_required_error"
                 self ._logger (f"Cookie error: {status_key }. Showing help dialog.")
-                cookie_help_dialog =CookieHelpDialog (self )
+                cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
                 cookie_help_dialog .exec_ ()
             elif status_key =="KEY_AUTH_FAILED":
                 status_label_text_key ="fav_posts_auth_failed_title"
                 self ._logger (f"Auth error: {status_key }. Showing help dialog.")
                 QMessageBox .warning (self ,self ._tr ("fav_posts_auth_failed_title","Authorization Failed (Posts)"),
                 self ._tr ("fav_posts_auth_failed_message_generic","...").format (domain_specific_part =specific_domain_msg_part ))
-                cookie_help_dialog =CookieHelpDialog (self )
+                cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
                 cookie_help_dialog .exec_ ()
             elif status_key =="KEY_NO_FAVORITES_FOUND_ALL_PLATFORMS":
                 status_label_text_key ="fav_posts_no_posts_found_status"

src/ui/main_window.py

@@ -4288,13 +4288,13 @@ class DownloaderApp (QWidget ):
             self.log_signal.emit("    Cancelling active External Link download thread...")
             self.external_link_download_thread.cancel()
 
-    def _get_domain_for_service (self ,service_name :str )->str :
+    def _get_domain_for_service(self, service_name: str) -> str:
         """Determines the base domain for a given service."""
-        if not isinstance (service_name ,str ):
-            return "kemono.cr"
-        service_lower =service_name .lower ()
-        coomer_primary_services ={'onlyfans','fansly','manyvids','candfans','gumroad','patreon','subscribestar','dlsite','discord','fantia','boosty','pixiv','fanbox'}
-        if service_lower in coomer_primary_services and service_lower not in ['patreon','discord','fantia','boosty','pixiv','fanbox']:
+        if not isinstance(service_name, str):
+            return "kemono.cr"  # Default fallback
+        service_lower = service_name.lower()
+        coomer_primary_services = {'onlyfans', 'fansly', 'manyvids', 'candfans', 'gumroad', 'subscribestar', 'dlsite'}
+        if service_lower in coomer_primary_services:
             return "coomer.st"
         return "kemono.cr"
 
@@ -5343,42 +5343,54 @@ class DownloaderApp (QWidget ):
 
         target_domain_preference_for_fetch =None 
 
-        if cookies_config ['use_cookie']:
-            self .log_signal .emit ("Favorite Posts: 'Use Cookie' is checked. Determining target domain...")
-            kemono_cookies =prepare_cookies_for_request (
-            cookies_config ['use_cookie'],
-            cookies_config ['cookie_text'],
-            cookies_config ['selected_cookie_file'],
-            cookies_config ['app_base_dir'],
-            lambda msg :self .log_signal .emit (f"[FavPosts Cookie Check - Kemono] {msg }"),
-            target_domain ="kemono.su"
+        if cookies_config['use_cookie']:
+            self.log_signal.emit("Favorite Posts: 'Use Cookie' is checked. Determining target domain...")
+            
+            # --- Kemono Check with Fallback ---
+            kemono_cookies = prepare_cookies_for_request(
+                cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                target_domain="kemono.cr"
             )
-            coomer_cookies =prepare_cookies_for_request (
-            cookies_config ['use_cookie'],
-            cookies_config ['cookie_text'],
-            cookies_config ['selected_cookie_file'],
-            cookies_config ['app_base_dir'],
-            lambda msg :self .log_signal .emit (f"[FavPosts Cookie Check - Coomer] {msg }"),
-            target_domain ="coomer.su"
+            if not kemono_cookies:
+                self.log_signal.emit("  ↳ No cookies for kemono.cr, trying fallback kemono.su...")
+                kemono_cookies = prepare_cookies_for_request(
+                    cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                    cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                    target_domain="kemono.su"
+                )
+
+            # --- Coomer Check with Fallback ---
+            coomer_cookies = prepare_cookies_for_request(
+                cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                target_domain="coomer.st"
             )
+            if not coomer_cookies:
+                self.log_signal.emit("  ↳ No cookies for coomer.st, trying fallback coomer.su...")
+                coomer_cookies = prepare_cookies_for_request(
+                    cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                    cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                    target_domain="coomer.su"
+                )
 
-            kemono_ok =bool (kemono_cookies )
-            coomer_ok =bool (coomer_cookies )
+            kemono_ok = bool(kemono_cookies)
+            coomer_ok = bool(coomer_cookies)
 
-            if kemono_ok and not coomer_ok :
-                target_domain_preference_for_fetch ="kemono.su"
-                self .log_signal .emit ("  ↳ Only Kemono.su cookies loaded. Will fetch favorites from Kemono.su only.")
-            elif coomer_ok and not kemono_ok :
-                target_domain_preference_for_fetch ="coomer.su"
-                self .log_signal .emit ("  ↳ Only Coomer.su cookies loaded. Will fetch favorites from Coomer.su only.")
-            elif kemono_ok and coomer_ok :
-                target_domain_preference_for_fetch =None 
-                self .log_signal .emit ("  ↳ Cookies for both Kemono.su and Coomer.su loaded. Will attempt to fetch from both.")
-            else :
-                self .log_signal .emit ("  ↳ No valid cookies loaded for Kemono.su or Coomer.su.")
-                cookie_help_dialog =CookieHelpDialog (self ,self )
-                cookie_help_dialog .exec_ ()
-                return 
+            if kemono_ok and not coomer_ok:
+                target_domain_preference_for_fetch = "kemono.cr"
+                self.log_signal.emit("  ↳ Only Kemono cookies loaded. Will fetch favorites from Kemono.cr only.")
+            elif coomer_ok and not kemono_ok:
+                target_domain_preference_for_fetch = "coomer.st"
+                self.log_signal.emit("  ↳ Only Coomer cookies loaded. Will fetch favorites from Coomer.st only.")
+            elif kemono_ok and coomer_ok:
+                target_domain_preference_for_fetch = None
+                self.log_signal.emit("  ↳ Cookies for both Kemono and Coomer loaded. Will attempt to fetch from both.")
+            else:
+                self.log_signal.emit("  ↳ No valid cookies loaded for Kemono.cr or Coomer.st.")
+                cookie_help_dialog = CookieHelpDialog(self, self)
+                cookie_help_dialog.exec_()
+                return
         else :
             self .log_signal .emit ("Favorite Posts: 'Use Cookie' is NOT checked. Cookies are required.")
             cookie_help_dialog =CookieHelpDialog (self ,self )