206 lines
7.7 KiB
Python
206 lines
7.7 KiB
Python
# -*- coding: UTF-8 -*-
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import os
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from PIL import Image
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import time
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import io
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import base64
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import logging
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logger = logging.getLogger(__name__)
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import imghdr
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from multiprocessing import Pool
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import atexit
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from .emoji import EmojiReader
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from .avatar import AvatarReader
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from .common.textutil import md5 as get_md5_hex, get_file_b64
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from .msg import TYPE_SPEAK
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from .audio import parse_wechat_audio_file
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from .wxgf import WxgfAndroidDecoder, is_wxgf_file
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LIB_PATH = os.path.dirname(os.path.abspath(__file__))
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VOICE_DIRNAME = 'voice2'
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IMG_DIRNAME = 'image2'
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EMOJI_DIRNAME = 'emoji'
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VIDEO_DIRNAME = 'video'
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JPEG_QUALITY = 50
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class Resource(object):
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""" Multimedia resources parser."""
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def __init__(self, parser,
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res_dir: str,
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*,
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wxgf_server: str | None = None,
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avt_db: str | None = None):
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"""
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Args:
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res_dir: path to the resource directory
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wxgf_server: "hostname:port" that points to the wxgf converter android app
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avt_db: "avatar.index" file that only exists in old versions of wechat
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"""
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def check(subdir):
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dir_to_check = os.path.join(res_dir, subdir)
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assert os.path.isdir(dir_to_check), f"No such directory: {dir_to_check}"
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[check(k) for k in ['', IMG_DIRNAME, EMOJI_DIRNAME, VOICE_DIRNAME]]
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self.res_dir = res_dir
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self.parser = parser
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self.voice_cache_idx = {}
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self.img_dir = os.path.join(res_dir, IMG_DIRNAME)
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self.voice_dir = os.path.join(res_dir, VOICE_DIRNAME)
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self.video_dir = os.path.join(res_dir, VIDEO_DIRNAME)
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self.avt_reader = AvatarReader(res_dir, avt_db)
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self.wxgf_decoder = WxgfAndroidDecoder(wxgf_server)
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self.emoji_reader = EmojiReader(res_dir, self.parser, wxgf_decoder=self.wxgf_decoder)
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def _get_voice_filename(self, imgpath):
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fname = get_md5_hex(imgpath.encode('ascii'))
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dir1, dir2 = fname[:2], fname[2:4]
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ret = os.path.join(self.voice_dir, dir1, dir2,
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'msg_{}.amr'.format(imgpath))
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if not os.path.isfile(ret):
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logger.error(f"Cannot find voice file {imgpath}, {fname}")
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return ""
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return ret
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def get_voice_mp3(self, imgpath):
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""" return mp3 and duration, or empty string and 0 on failure"""
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idx = self.voice_cache_idx.get(imgpath)
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if idx is None:
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return parse_wechat_audio_file(
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self._get_voice_filename(imgpath))
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return self.voice_cache[idx].get()
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def cache_voice_mp3(self, msgs):
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""" for speed.
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msgs: a collection of WeChatMsg, to cache for later fetch"""
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voice_paths = [msg.imgPath for msg in msgs if msg.type == TYPE_SPEAK]
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# NOTE: remove all the caching code to debug serial decoding
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self.voice_cache_idx = {k: idx for idx, k in enumerate(voice_paths)}
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pool = Pool(3)
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atexit.register(lambda x: x.terminate(), pool)
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self.voice_cache = [pool.apply_async(parse_wechat_audio_file,
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(self._get_voice_filename(k),)) for k in voice_paths]
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def get_avatar(self, username):
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""" return base64 unicode string"""
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im = self.avt_reader.get_avatar(username)
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if im is None:
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logger.warning(f"Cannot find avatar for {username}.")
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return ""
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buf = io.BytesIO()
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try:
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im.save(buf, 'JPEG', quality=JPEG_QUALITY)
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except IOError:
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try:
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# sometimes it works the second time...
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im.save(buf, 'JPEG', quality=JPEG_QUALITY)
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except IOError:
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return ""
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jpeg_str = buf.getvalue()
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return base64.b64encode(jpeg_str).decode('ascii')
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def _get_img_file(self, fnames):
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""" fnames: a list of filename to search for
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return (filename, filename) of (big, small) image.
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could be empty string.
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"""
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cands = []
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for fname in fnames:
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dir1, dir2 = fname[:2], fname[2:4]
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dirname = os.path.join(self.img_dir, dir1, dir2)
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if not os.path.isdir(dirname):
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logger.warn("Directory not found: {}".format(dirname))
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continue
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for f in os.listdir(dirname):
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if fname in f:
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full_name = os.path.join(dirname, f)
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size = os.path.getsize(full_name)
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if size > 0:
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cands.append((full_name, size))
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if not cands:
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return ("", "")
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cands = sorted(cands, key=lambda x: x[1])
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def name_is_thumbnail(name):
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return os.path.basename(name).startswith('th_') \
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and not name.endswith('hd')
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if len(cands) == 1:
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name = cands[0][0]
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if name_is_thumbnail(name):
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# thumbnail
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return ("", name)
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else:
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logger.warn("Found big image but not thumbnail: {}".format(fname))
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return (name, "")
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big = cands[-1]
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ths = list(filter(name_is_thumbnail, [k[0] for k in cands]))
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if not ths:
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return (big[0], "")
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return (big[0], ths[0])
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def get_img(self, fnames):
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"""
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:params fnames: possible file paths
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:returns: two base64 jpg string
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"""
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fnames = [k for k in fnames if k] # filter out empty string
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big_file, small_file = self._get_img_file(fnames)
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def get_jpg_b64(img_file):
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if not img_file:
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return None
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# True jpeg. Simplest case.
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if img_file.endswith('jpg') and \
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imghdr.what(img_file) == 'jpeg':
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return get_file_b64(img_file)
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if is_wxgf_file(img_file):
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start = time.time()
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buf = self.wxgf_decoder.decode_with_cache(img_file, None)
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if buf is None:
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if not self.wxgf_decoder.has_server():
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logger.warning("wxgf decoder server is not provided. Cannot decode wxgf images. Please follow instructions to create wxgf decoder server if these images need to be decoded.")
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else:
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logger.error("Failed to decode wxgf file: {}".format(img_file))
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return None
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else:
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elapsed = time.time() - start
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if elapsed > 0.01 and self.wxgf_decoder.has_server():
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logger.info(f"Decoded {img_file} in {elapsed:.2f} seconds")
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else:
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with open(img_file, 'rb') as f:
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buf = f.read()
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# File is not actually jpeg. Convert.
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if imghdr.what(file=None, h=buf) != 'jpeg':
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try:
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im = Image.open(io.BytesIO(buf))
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except:
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return None
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else:
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bufio = io.BytesIO()
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im.convert('RGB').save(bufio, 'JPEG', quality=JPEG_QUALITY)
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buf = bufio.getvalue()
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return base64.b64encode(buf).decode('ascii')
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big_file = get_jpg_b64(big_file)
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if big_file:
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return big_file
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return get_jpg_b64(small_file)
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def get_emoji_by_md5(self, md5):
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""" Returns: (b64 encoded img string, format) """
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return self.emoji_reader.get_emoji(md5)
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def get_video(self, videoid) -> str | None:
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video_file = os.path.join(self.video_dir, videoid + ".mp4")
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video_thumbnail_file = os.path.join(self.video_dir, videoid + ".jpg")
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if os.path.exists(video_file):
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return video_file
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elif os.path.exists(video_thumbnail_file):
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return video_thumbnail_file
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return None
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