Kemono-Downloader/drive.py

from mega import Mega 
import os 
import requests 
import traceback 
from urllib .parse import urlparse ,urlunparse ,parse_qs ,urlencode 

try :
    import gdown 
    GDOWN_AVAILABLE =True 
except ImportError :
    GDOWN_AVAILABLE =False 

def download_mega_file (mega_link ,download_path =".",logger_func =print ):
    """
    Downloads a file from a public Mega.nz link.

    Args:
        mega_link (str): The public Mega.nz link to the file.
        download_path (str, optional): The directory to save the downloaded file.
                                       Defaults to the current directory.
        logger_func (callable, optional): Function to use for logging. Defaults to print.
    """
    logger_func ("drive.py: download_mega_file called.")
    logger_func (f"drive.py: mega_link='{mega_link}', download_path='{download_path}'")

    logger_func ("drive.py: Initializing Mega client (Mega())...")
    try:
        mega_client = Mega()
    except Exception as e_init:
        logger_func(f"drive.py: ERROR during Mega() instantiation: {e_init}")
        traceback.print_exc()
        raise
    logger_func ("drive.py: Mega client initialized. Logging in anonymously (m.login())...")
    try:
        m = mega_client.login()
    except Exception as e_login:
        logger_func(f"drive.py: ERROR during m.login(): {e_login}")
        traceback.print_exc()
        raise
    logger_func ("drive.py: Logged in anonymously.")

    logger_func (f"drive.py: Attempting to download from: {mega_link }")

    try :
        if not os .path .exists (download_path ):
            logger_func (f"drive.py: Download path '{download_path }' does not exist. Creating it...")
            os .makedirs (download_path ,exist_ok =True )
        logger_func (f"drive.py: Download path ensured: '{download_path }'")

        logger_func (f"drive.py: Calling m.download_url for '{mega_link }' to '{download_path }'...")
        
        # The download_url method returns the local file path of the downloaded file.
        # It takes dest_path (directory) and dest_filename (optional).
        # If dest_filename is None, it uses the name from get_public_url_info().
        downloaded_file_path = m.download_url(mega_link, dest_path=download_path, dest_filename=None)

        logger_func(f"drive.py: m.download_url returned: {downloaded_file_path}")

        if downloaded_file_path and os.path.exists(downloaded_file_path):
            logger_func(f"drive.py: File downloaded successfully! Saved as: {downloaded_file_path}")
            # Optional: Verify size if possible, but get_public_url_info is another network call
            # and might be redundant or problematic if the download itself worked.
        elif downloaded_file_path:
            logger_func(f"drive.py: m.download_url returned a path '{downloaded_file_path}', but it does not exist on disk. Download may have failed silently or path is incorrect.")
            raise Exception(f"Mega download_url returned path '{downloaded_file_path}' which was not found.")
        else :
            logger_func ("drive.py: Download failed. m.download_url did not return a valid file path.")
            raise Exception ("Mega download_url did not return a file path or failed.")

    except PermissionError as e:
        logger_func(f"drive.py: PermissionError: {e}. Denied to write to '{download_path}'. Please check permissions.")
        raise
    except FileNotFoundError as e:
        logger_func(f"drive.py: FileNotFoundError: {e}. The path '{download_path}' is invalid.")
        raise
    except requests.exceptions.ConnectionError as e: # More specific for network
        logger_func(f"drive.py: requests.exceptions.ConnectionError: {e}. Network problem during Mega operation.")
        raise
    except requests.exceptions.RequestException as e: # General requests error
        logger_func(f"drive.py: requests.exceptions.RequestException: {e} during request to Mega.")
        raise
    except Exception as e: # Catch-all for other errors from mega.py or os calls
        logger_func(f"drive.py: An unexpected error occurred during Mega download: {e}")
        traceback.print_exc() # Print full traceback for unexpected errors
        raise

def download_gdrive_file (gdrive_link ,download_path =".",logger_func =print ):
    """
    Downloads a file from a public Google Drive link.

    Args:
        gdrive_link (str): The public Google Drive link to the file.
        download_path (str, optional): The directory to save the downloaded file.
                                       Defaults to the current directory.
        logger_func (callable, optional): Function to use for logging. Defaults to print.
    """
    if not GDOWN_AVAILABLE :
        logger_func ("❌ Error: gdown library is not installed. Cannot download from Google Drive.")
        logger_func ("Please install it: pip install gdown")
        raise ImportError ("gdown library not found. Please install it: pip install gdown")

    logger_func (f"Attempting to download from Google Drive: {gdrive_link }")
    try :
        if not os .path .exists (download_path ):
            logger_func (f"Download path '{download_path }' does not exist. Creating it...")
            os .makedirs (download_path ,exist_ok =True )

        logger_func (f"Starting Google Drive download to '{download_path }'...")

        output_file_path =gdown .download (gdrive_link ,output =download_path ,quiet =False ,fuzzy =True )

        if output_file_path and os .path .exists (os .path .join (download_path ,os .path .basename (output_file_path ))):
            logger_func (f"✅ Google Drive file downloaded successfully: {output_file_path }")
        elif output_file_path :
            full_path_check =os .path .join (download_path ,output_file_path )
            if os .path .exists (full_path_check ):
                 logger_func (f"✅ Google Drive file downloaded successfully: {full_path_check }")
            else :
                 logger_func (f"⚠️ Google Drive download finished, gdown returned '{output_file_path }', but file not found at expected location.")
                 logger_func (f"   Please check '{download_path }' for the downloaded file, it might have a different name than expected by gdown's return.")

                 files_in_dest =[f for f in os .listdir (download_path )if os .path .isfile (os .path .join (download_path ,f ))]
                 if len (files_in_dest )==1 :
                     logger_func (f"   Found one file in destination: {os .path .join (download_path ,files_in_dest [0 ])}. Assuming this is it.")
                 elif len (files_in_dest )>1 and output_file_path in files_in_dest :
                     logger_func (f"   Confirmed file '{output_file_path }' exists in '{download_path }'.")
                 else :
                     raise Exception (f"gdown download failed or file not found. Returned: {output_file_path }")
        else :
            logger_func ("❌ Google Drive download failed. gdown did not return an output path.")
            raise Exception ("gdown download failed.")

    except PermissionError :
        logger_func (f"❌ Error: Permission denied to write to '{download_path }'. Please check permissions.")
        raise 
    except Exception as e :
        logger_func (f"❌ An error occurred during Google Drive download: {e }")
        traceback .print_exc ()
        raise 

def _get_filename_from_headers (headers ):
    cd =headers .get ('content-disposition')
    if not cd :
        return None 
    fname_match =re .findall ('filename="?([^"]+)"?',cd )
    if fname_match :
        return fname_match [0 ].strip ()
    return None 

def download_dropbox_file (dropbox_link ,download_path =".",logger_func =print ):
    """
    Downloads a file from a public Dropbox link.

    Args:
        dropbox_link (str): The public Dropbox link to the file.
        download_path (str, optional): The directory to save the downloaded file.
                                       Defaults to the current directory.
        logger_func (callable, optional): Function to use for logging. Defaults to print.
    """
    logger_func (f"Attempting to download from Dropbox: {dropbox_link }")


    parsed_url =urlparse (dropbox_link )
    query_params =parse_qs (parsed_url .query )
    query_params ['dl']=['1']
    new_query =urlencode (query_params ,doseq =True )
    direct_download_url =urlunparse (parsed_url ._replace (query =new_query ))

    logger_func (f"   Using direct download URL: {direct_download_url }")

    try :
        if not os .path .exists (download_path ):
            logger_func (f"Download path '{download_path }' does not exist. Creating it...")
            os .makedirs (download_path ,exist_ok =True )

        with requests .get (direct_download_url ,stream =True ,allow_redirects =True ,timeout =(10 ,300 ))as r :
            r .raise_for_status ()
            filename =_get_filename_from_headers (r .headers )or os .path .basename (urlparse (dropbox_link ).path )or "dropbox_downloaded_file"

            filename =re .sub (r'[<>:"/\\|?*]','_',filename )
            full_save_path =os .path .join (download_path ,filename )
            logger_func (f"Starting Dropbox download of '{filename }' to '{full_save_path }'...")
            with open (full_save_path ,'wb')as f :
                for chunk in r .iter_content (chunk_size =8192 ):
                    f .write (chunk )
            logger_func (f"✅ Dropbox file downloaded successfully: {full_save_path }")
    except Exception as e :
        logger_func (f"❌ An error occurred during Dropbox download: {e }")
        traceback .print_exc ()
        raise 

if __name__ =="__main__":

    mega_file_link ="https://mega.nz/file/03oRjBQT#Tcbp5sQVIyPbdmv8sLgbb9Lf9AZvZLdKRSQiuXkNW0k"

    if not mega_file_link .startswith ("https://mega.nz/file/"):
        print ("Invalid Mega file link format. It should start with 'https://mega.nz/file/'.")
    else :


        script_dir =os .path .dirname (os .path .abspath (__file__ ))
        download_directory =os .path .join (script_dir ,"mega_downloads")

        print (f"Files will be downloaded to: {download_directory }")
        download_mega_file (mega_file_link ,download_directory ,logger_func =print )