PixivDownloadHandler.py

# -*- coding: utf-8 -*-
import codecs
import gc
import os
import shlex
import subprocess
import sys
import time
import traceback
import urllib

import mechanize

import PixivBrowserFactory
import PixivConfig
import PixivConstant
import PixivHelper
from PixivDBManager import PixivDBManager
from PixivException import PixivException


def download_image(caller,
                   url,
                   filename,
                   referer,
                   overwrite,
                   max_retry,
                   backup_old_file=False,
                   image=None,
                   page=None,
                   notifier=None,
                   download_from=PixivConstant.DOWNLOAD_PIXIV):
    '''return download result and filename if ok'''
    # caller function/method
    # TODO: ideally to be removed or passed as argument
    db: PixivDBManager = caller.__dbManager__
    config: PixivConfig = caller.__config__

    if notifier is None:
        notifier = PixivHelper.dummy_notifier

    temp_error_code = None
    retry_count = 0

    # Issue #548
    filename_save = filename

    # test once and set the result
    if caller.UTF8_FS is None:
        filename_test = os.path.dirname(filename_save) + os.sep + "あいうえお"
        try:
            PixivHelper.makeSubdirs(filename_test)
            test_utf = open(filename_test + '.test', "wb")
            test_utf.close()
            os.remove(filename_test + '.test')
            caller.UTF8_FS = True
        except UnicodeEncodeError:
            caller.UTF8_FS = False

    if not caller.UTF8_FS:
        filename_save = filename.encode('utf-8')  # For file operations, force the usage of a utf-8 encode filename

    while retry_count <= max_retry:
        res = None
        req = None
        try:
            try:
                if not overwrite and not config.alwaysCheckFileSize:
                    PixivHelper.print_and_log(None, '\rChecking local filename...', newline=False)
                    if os.path.isfile(filename_save):
                        PixivHelper.print_and_log('info', f"\rLocal file exists: {filename}")
                        return (PixivConstant.PIXIVUTIL_SKIP_DUPLICATE, filename_save)

                # Issue #807
                if config.checkLastModified and os.path.isfile(filename_save) and image is not None:
                    local_timestamp = os.path.getmtime(filename_save)
                    remote_timestamp = time.mktime(image.worksDateDateTime.timetuple())
                    if local_timestamp == remote_timestamp:
                        PixivHelper.print_and_log('info', f"\rLocal file timestamp match with remote: {filename} => {image.worksDateDateTime}")
                        return (PixivConstant.PIXIVUTIL_SKIP_DUPLICATE, filename_save)

                remote_file_size = get_remote_filesize(url, referer, config, notifier)

                # 837
                if config.skipUnknownSize and os.path.isfile(filename_save) and remote_file_size == -1:
                    PixivHelper.print_and_log('info', f"\rSkipped because file exists and cannot get remote file size for: {filename}")
                    return (PixivConstant.PIXIVUTIL_SKIP_DUPLICATE, filename_save)

                # 576
                if remote_file_size > 0:
                    if config.minFileSize != 0 and remote_file_size <= config.minFileSize:
                        result = PixivConstant.PIXIVUTIL_SIZE_LIMIT_SMALLER
                        return (result, filename_save)
                    if config.maxFileSize != 0 and remote_file_size >= config.maxFileSize:
                        result = PixivConstant.PIXIVUTIL_SIZE_LIMIT_LARGER
                        return (result, filename_save)

                # check if existing ugoira file exists
                if filename.endswith(".zip"):
                    # non-converted zip (no animation.json)
                    if os.path.isfile(filename_save):
                        old_size = os.path.getsize(filename_save)
                        # update for #451, always return identical?
                        check_result = PixivHelper.check_file_exists(overwrite, filename_save, remote_file_size, old_size, backup_old_file)
                        if config.createUgoira:
                            handle_ugoira(image, filename_save, config, notifier)
                        return (check_result, filename)
                    # converted to ugoira (has animation.json)
                    ugo_name = filename[:-4] + ".ugoira"
                    if os.path.isfile(ugo_name):
                        old_size = PixivHelper.get_ugoira_size(ugo_name)
                        check_result = PixivHelper.check_file_exists(overwrite, ugo_name, remote_file_size, old_size, backup_old_file)
                        if check_result != PixivConstant.PIXIVUTIL_OK:
                            # try to convert existing file.
                            handle_ugoira(image, filename_save, config, notifier)

                            return (check_result, filename)
                elif os.path.isfile(filename_save):
                    # other image? files
                    old_size = os.path.getsize(filename_save)
                    check_result = PixivHelper.check_file_exists(overwrite, filename, remote_file_size, old_size, backup_old_file)
                    if check_result != PixivConstant.PIXIVUTIL_OK:
                        return (check_result, filename)

                # check based on filename stored in DB using image id
                if image is not None:
                    row = None
                    db_filename = None
                    # Issue #1084
                    if download_from == PixivConstant.DOWNLOAD_PIXIV:
                        if page is not None:
                            row = db.selectImageByImageIdAndPage(image.imageId, page)
                            if row is not None:
                                db_filename = row[2]
                        else:
                            row = db.selectImageByImageId(image.imageId)
                            if row is not None:
                                db_filename = row[3]
                    elif download_from == PixivConstant.DOWNLOAD_FANBOX:
                        if page is not None:
                            row = db.selectFanboxImageByImageIdAndPage(image.imageId, page)
                        else:
                            row = db.selectFanboxImageByImageIdAndPage(image.imageId, -1)  # Cover image
                        if row is not None:
                            db_filename = row[2]
                    elif download_from == PixivConstant.DOWNLOAD_SKETCH:
                        if page is not None:
                            row = db.selectSketchImageByImageIdAndPage(image.imageId, page)
                        else:
                            row = db.selectSketchImageByImageIdAndPage(image.imageId, 0)
                        if row is not None:
                            db_filename = row[2]

                    if db_filename is not None and os.path.isfile(db_filename):
                        old_size = os.path.getsize(db_filename)
                        # if file_size < 0:
                        #     file_size = get_remote_filesize(url, referer)
                        check_result = PixivHelper.check_file_exists(overwrite, db_filename, remote_file_size, old_size, backup_old_file)
                        if check_result != PixivConstant.PIXIVUTIL_OK:
                            ugo_name = None
                            if db_filename.endswith(".zip"):
                                ugo_name = filename[:-4] + ".ugoira"
                                if config.createUgoira:
                                    handle_ugoira(image, db_filename, config, notifier)
                            if db_filename.endswith(".ugoira"):
                                ugo_name = db_filename
                                handle_ugoira(image, db_filename, config, notifier)

                            return (check_result, db_filename)

                # actual download
                notifier(type="DOWNLOAD", message=f"Start downloading {url} to {filename_save}")
                (downloadedSize, filename_save) = perform_download(url, remote_file_size, filename_save, overwrite, config, referer)

                # Issue #956 need to calculate hash file for each method
                old_filename_save = filename_save
                if filename_save.find("%md5%") > 0:
                    PixivHelper.print_and_log('info', 'Calculating md5...', end="")
                    hash_str = PixivHelper.get_hash(filename_save)
                    PixivHelper.print_and_log('info', f" => {hash_str}")
                    filename_save = filename_save.replace("%md5%", hash_str)
                if filename_save.find("%sha1%") > 0:
                    PixivHelper.print_and_log('info', 'Calculating sha1...', end="")
                    hash_str = PixivHelper.get_hash(filename_save, "sha1")
                    PixivHelper.print_and_log('info', f" => {hash_str}")
                    filename_save = filename_save.replace("%sha1%", hash_str)
                if filename_save.find("%sha256%") > 0:
                    PixivHelper.print_and_log('info', 'Calculating sha256...', end="")
                    hash_str = PixivHelper.get_hash(filename_save, "sha256")
                    PixivHelper.print_and_log('info', f" => {hash_str}")
                    filename_save = filename_save.replace("%sha256%", hash_str)
                if not os.path.exists(filename_save) and os.path.exists(old_filename_save):
                    os.rename(old_filename_save, filename_save)

                # set last-modified and last-accessed timestamp
                if image is not None and config.setLastModified and filename_save is not None and os.path.isfile(filename_save):
                    ts = time.mktime(image.worksDateDateTime.timetuple())
                    os.utime(filename_save, (ts, ts))

                # check the downloaded file size again
                if remote_file_size > 0 and downloadedSize != remote_file_size:
                    raise PixivException(f"Incomplete Downloaded for {url}", PixivException.DOWNLOAD_FAILED_OTHER)
                elif config.verifyImage and filename_save.endswith((".jpg", ".png", ".gif")):
                    fp = None
                    try:
                        from PIL import Image, ImageFile
                        fp = open(filename_save, "rb")
                        # Fix Issue #269, refer to https://stackoverflow.com/a/42682508
                        ImageFile.LOAD_TRUNCATED_IMAGES = True
                        img = Image.open(fp)
                        img.load()
                        fp.close()
                        PixivHelper.print_and_log('info', ' Image verified.')
                    except BaseException:
                        if fp is not None:
                            fp.close()
                        PixivHelper.print_and_log('info', ' Image invalid, deleting...')
                        os.remove(filename_save)
                        raise
                elif config.verifyImage and filename_save.endswith((".ugoira", ".zip")):
                    fp = None
                    try:
                        import zipfile
                        fp = open(filename_save, "rb")
                        zf = zipfile.ZipFile(fp)
                        check_result = None
                        try:
                            check_result = zf.testzip()
                        except RuntimeError as e:
                            if 'encrypted' in str(e):
                                PixivHelper.print_and_log('info', ' archive is encrypted, cannot verify.')
                            else:
                                raise
                        fp.close()
                        if check_result is None:
                            PixivHelper.print_and_log('info', ' Image verified.')
                        else:
                            PixivHelper.print_and_log('info', f' Corrupted file in archive: {check_result}.')
                            raise PixivException(f"Incomplete Downloaded for {url}", PixivException.DOWNLOAD_FAILED_OTHER)
                    except BaseException:
                        if fp is not None:
                            fp.close()
                        PixivHelper.print_and_log('info', ' Image invalid, deleting...')
                        os.remove(filename_save)
                        raise
                else:
                    PixivHelper.print_and_log('info', ' done.')

                # write to downloaded lists
                if caller.start_iv or config.createDownloadLists:
                    dfile = codecs.open(caller.dfilename, 'a+', encoding='utf-8')
                    dfile.write(filename_save + "\n")
                    dfile.close()

                # Issue #970
                if config.enablePostProcessing and len(config.postProcessingCmd) > 0:
                    cmd = config.postProcessingCmd.replace("%filename%", filename_save)
                    PixivHelper.print_and_log('info', f'Running post processing command: {cmd}')
                    subprocess.Popen(shlex.split(cmd), startupinfo=None)

                return (PixivConstant.PIXIVUTIL_OK, filename_save)

            except urllib.error.HTTPError as httpError:
                PixivHelper.print_and_log('error', f'[download_image()] HTTP Error: {httpError} at {url}')
                if httpError.code == 404 or httpError.code == 502 or httpError.code == 500:
                    return (PixivConstant.PIXIVUTIL_NOT_OK, None)
                temp_error_code = PixivException.DOWNLOAD_FAILED_NETWORK
                raise
            except urllib.error.URLError as urlError:
                PixivHelper.print_and_log('error', f'[download_image()] URL Error: {urlError} at {url}')
                temp_error_code = PixivException.DOWNLOAD_FAILED_NETWORK
                raise
            except IOError as ioex:
                if ioex.errno == 28:
                    PixivHelper.print_and_log('error', str(ioex))
                    input("Press Enter to retry.")
                    continue
                temp_error_code = PixivException.DOWNLOAD_FAILED_IO
                raise
            except KeyboardInterrupt:
                PixivHelper.print_and_log('info', 'Aborted by user request => Ctrl-C')
                return (PixivConstant.PIXIVUTIL_ABORTED, None)
            finally:
                if res is not None:
                    del res
                if req is not None:
                    del req

        except BaseException:
            if temp_error_code is None:
                temp_error_code = PixivException.DOWNLOAD_FAILED_OTHER
            caller.ERROR_CODE = temp_error_code
            exc_type, exc_value, exc_traceback = sys.exc_info()
            traceback.print_exception(exc_type, exc_value, exc_traceback)
            PixivHelper.print_and_log('error', f'Error at download_image(): {sys.exc_info()} at {url} ({caller.ERROR_CODE})')

            if retry_count < max_retry:
                retry_count = retry_count + 1
                PixivHelper.print_and_log(None, f"\rRetrying [{retry_count}]...", newline=False)
                PixivHelper.print_delay(config.retryWait)
            else:
                raise


def perform_download(url, file_size, filename, overwrite, config, referer=None, notifier=None):
    if notifier is None:
        notifier = PixivHelper.dummy_notifier

    if referer is None:
        referer = config.referer
    # actual download
    PixivHelper.print_and_log(None, '\rStart downloading...', newline=False)
    # fetch filesize
    req = PixivHelper.create_custom_request(url, config, referer)
    br = PixivBrowserFactory.getBrowser(config=config)
    res = br.open_novisit(req)
    if file_size < 0:  # final check before download for download progress bar.
        try:
            content_length = res.info()['Content-Length']
            if content_length is not None:
                file_size = int(content_length)
        except KeyError:
            file_size = -1
            PixivHelper.print_and_log('info', "\tNo file size information!")
    (downloadedSize, filename) = PixivHelper.download_image(url, filename, res, file_size, overwrite)
    res.close()
    gc.collect()
    return (downloadedSize, filename)


# issue #299
def get_remote_filesize(url, referer, config, notifier=None):
    if notifier is None:
        notifier = PixivHelper.dummy_notifier

    PixivHelper.print_and_log(None, 'Getting remote filesize...')
    # open with HEAD method, might be expensive
    req = PixivHelper.create_custom_request(url, config, referer, head=True)
    file_size = -1

    try:
        br = PixivBrowserFactory.getBrowser(config=config)
        res = br.open_novisit(req)
        content_length = res.info()['Content-Length']
        if content_length is not None:
            file_size = int(content_length)
        else:
            PixivHelper.print_and_log('info', "\tNo file size information!")
        res.close()
    except KeyError:
        PixivHelper.print_and_log('info', "\tNo file size information!")
    except mechanize.HTTPError as e:
        # fix Issue #503
        # handle http errors explicit by code
        if int(e.code) in (404, 500):
            PixivHelper.print_and_log('info', "\tNo file size information!")
        else:
            raise

    PixivHelper.print_and_log(None, f"Remote filesize = {PixivHelper.size_in_str(file_size)} ({file_size} Bytes)")
    return file_size


def handle_ugoira(image, zip_filename, config, notifier):
    if notifier is None:
        notifier = PixivHelper.dummy_notifier

    if zip_filename.endswith(".zip"):
        ugo_name = zip_filename[:-4] + ".ugoira"
    else:
        ugo_name = zip_filename

    if not os.path.exists(ugo_name):
        PixivHelper.print_and_log('info', f"Creating ugoira archive => {ugo_name}")
        image.create_ugoira(zip_filename)
        # set last-modified and last-accessed timestamp
        if config.setLastModified and ugo_name is not None and os.path.isfile(ugo_name):
            ts = time.mktime(image.worksDateDateTime.timetuple())
            os.utime(ugo_name, (ts, ts))

    if config.createGif:
        gif_filename = ugo_name[:-7] + ".gif"
        if not os.path.exists(gif_filename):
            PixivHelper.ugoira2gif(ugo_name,
                                   gif_filename,
                                   image=image)

    if config.createApng:
        apng_filename = ugo_name[:-7] + ".png"
        if not os.path.exists(apng_filename):
            PixivHelper.ugoira2apng(ugo_name,
                                    apng_filename,
                                    image=image)

    if config.createWebm:
        webm_filename = ugo_name[:-7] + "." + config.ffmpegExt
        if not os.path.exists(webm_filename):
            PixivHelper.ugoira2webm(ugo_name,
                                    webm_filename,
                                    codec=config.ffmpegCodec,
                                    extension=config.ffmpegExt,
                                    image=image)
    if config.createWebp:
        webp_filename = ugo_name[:-7] + ".webp"
        if not os.path.exists(webp_filename):
            PixivHelper.ugoira2webp(ugo_name,
                                    webp_filename,
                                    image=image)

    if config.deleteZipFile and os.path.exists(zip_filename) and zip_filename.endswith(".zip"):
        PixivHelper.print_and_log('info', f"Deleting zip file => {zip_filename}")
        os.remove(zip_filename)

    if config.deleteUgoira and os.path.exists(ugo_name) and ugo_name.endswith(".ugoira"):
        PixivHelper.print_and_log('info', f"Deleting ugoira file => {ugo_name}")
        os.remove(ugo_name)