mirror of
https://github.com/mikf/gallery-dl.git
synced 2024-11-23 19:22:32 +01:00
592 lines
15 KiB
Python
592 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017-2021 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""Utility functions and classes"""
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import re
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import os
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import sys
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import json
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import random
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import sqlite3
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import binascii
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import datetime
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import functools
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import itertools
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import urllib.parse
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from http.cookiejar import Cookie
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from . import text, exception
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def bencode(num, alphabet="0123456789"):
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"""Encode an integer into a base-N encoded string"""
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data = ""
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base = len(alphabet)
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while num:
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num, remainder = divmod(num, base)
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data = alphabet[remainder] + data
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return data
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def bdecode(data, alphabet="0123456789"):
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"""Decode a base-N encoded string ( N = len(alphabet) )"""
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num = 0
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base = len(alphabet)
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for c in data:
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num *= base
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num += alphabet.index(c)
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return num
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def advance(iterable, num):
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""""Advance 'iterable' by 'num' steps"""
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iterator = iter(iterable)
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next(itertools.islice(iterator, num, num), None)
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return iterator
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def unique(iterable):
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"""Yield unique elements from 'iterable' while preserving order"""
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seen = set()
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add = seen.add
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for element in iterable:
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if element not in seen:
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add(element)
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yield element
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def unique_sequence(iterable):
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"""Yield sequentially unique elements from 'iterable'"""
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last = None
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for element in iterable:
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if element != last:
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last = element
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yield element
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def raises(cls):
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"""Returns a function that raises 'cls' as exception"""
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def wrap(*args):
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raise cls(*args)
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return wrap
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def identity(x):
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"""Returns its argument"""
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return x
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def noop():
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"""Does nothing"""
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def generate_token(size=16):
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"""Generate a random token with hexadecimal digits"""
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data = random.getrandbits(size * 8).to_bytes(size, "big")
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return binascii.hexlify(data).decode()
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def format_value(value, suffixes="kMGTPEZY"):
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value = format(value)
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value_len = len(value)
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index = value_len - 4
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if index >= 0:
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offset = (value_len - 1) % 3 + 1
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return (value[:offset] + "." + value[offset:offset+2] +
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suffixes[index // 3])
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return value
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def combine_dict(a, b):
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"""Recursively combine the contents of 'b' into 'a'"""
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for key, value in b.items():
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if key in a and isinstance(value, dict) and isinstance(a[key], dict):
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combine_dict(a[key], value)
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else:
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a[key] = value
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return a
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def transform_dict(a, func):
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"""Recursively apply 'func' to all values in 'a'"""
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for key, value in a.items():
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if isinstance(value, dict):
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transform_dict(value, func)
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else:
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a[key] = func(value)
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def filter_dict(a):
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"""Return a copy of 'a' without "private" entries"""
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return {k: v for k, v in a.items() if k[0] != "_"}
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def delete_items(obj, keys):
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"""Remove all 'keys' from 'obj'"""
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for key in keys:
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if key in obj:
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del obj[key]
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def enumerate_reversed(iterable, start=0, length=None):
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"""Enumerate 'iterable' and return its elements in reverse order"""
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start -= 1
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if length is None:
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length = len(iterable)
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return zip(
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range(length - start, start, -1),
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reversed(iterable),
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)
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def number_to_string(value, numbers=(int, float)):
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"""Convert numbers (int, float) to string; Return everything else as is."""
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return str(value) if value.__class__ in numbers else value
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def to_string(value):
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"""str() with "better" defaults"""
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if not value:
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return ""
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if value.__class__ is list:
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try:
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return ", ".join(value)
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except Exception:
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return ", ".join(map(str, value))
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return str(value)
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def to_timestamp(dt):
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"""Convert naive datetime to UTC timestamp string"""
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try:
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return str((dt - EPOCH) // SECOND)
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except Exception:
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return ""
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def dump_json(obj, fp=sys.stdout, ensure_ascii=True, indent=4):
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"""Serialize 'obj' as JSON and write it to 'fp'"""
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json.dump(
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obj, fp,
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ensure_ascii=ensure_ascii,
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indent=indent,
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default=str,
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sort_keys=True,
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)
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fp.write("\n")
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def dump_response(response, fp, *,
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headers=False, content=True, hide_auth=True):
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"""Write the contents of 'response' into a file-like object"""
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if headers:
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request = response.request
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req_headers = request.headers.copy()
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res_headers = response.headers.copy()
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outfmt = """\
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{request.method} {request.url}
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Status: {response.status_code} {response.reason}
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Request Headers
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---------------
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{request_headers}
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Response Headers
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----------------
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{response_headers}
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"""
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if hide_auth:
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authorization = req_headers.get("Authorization")
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if authorization:
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atype, sep, _ = authorization.partition(" ")
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req_headers["Authorization"] = atype + " ***" if sep else "***"
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cookie = req_headers.get("Cookie")
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if cookie:
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req_headers["Cookie"] = ";".join(
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c.partition("=")[0] + "=***"
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for c in cookie.split(";")
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)
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set_cookie = res_headers.get("Set-Cookie")
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if set_cookie:
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res_headers["Set-Cookie"] = re.sub(
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r"(^|, )([^ =]+)=[^,;]*", r"\1\2=***", set_cookie,
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)
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fp.write(outfmt.format(
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request=request,
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response=response,
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request_headers="\n".join(
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name + ": " + value
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for name, value in req_headers.items()
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),
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response_headers="\n".join(
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name + ": " + value
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for name, value in res_headers.items()
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),
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).encode())
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if content:
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if headers:
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fp.write(b"\nContent\n-------\n")
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fp.write(response.content)
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def expand_path(path):
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"""Expand environment variables and tildes (~)"""
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if not path:
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return path
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if not isinstance(path, str):
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path = os.path.join(*path)
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return os.path.expandvars(os.path.expanduser(path))
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def remove_file(path):
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try:
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os.unlink(path)
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except OSError:
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pass
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def remove_directory(path):
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try:
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os.rmdir(path)
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except OSError:
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pass
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def load_cookiestxt(fp):
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"""Parse a Netscape cookies.txt file and return a list of its Cookies"""
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cookies = []
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for line in fp:
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line = line.lstrip()
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# strip '#HttpOnly_'
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if line.startswith("#HttpOnly_"):
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line = line[10:]
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# ignore empty lines and comments
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if not line or line[0] in ("#", "$"):
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continue
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# strip trailing '\n'
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if line[-1] == "\n":
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line = line[:-1]
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domain, domain_specified, path, secure, expires, name, value = \
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line.split("\t")
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if not name:
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name = value
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value = None
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cookies.append(Cookie(
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0, name, value,
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None, False,
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domain,
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domain_specified == "TRUE",
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domain.startswith("."),
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path, False,
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secure == "TRUE",
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None if expires == "0" or not expires else expires,
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False, None, None, {},
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))
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return cookies
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def save_cookiestxt(fp, cookies):
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"""Write 'cookies' in Netscape cookies.txt format to 'fp'"""
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fp.write("# Netscape HTTP Cookie File\n\n")
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for cookie in cookies:
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if cookie.value is None:
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name = ""
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value = cookie.name
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else:
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name = cookie.name
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value = cookie.value
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fp.write("\t".join((
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cookie.domain,
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"TRUE" if cookie.domain.startswith(".") else "FALSE",
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cookie.path,
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"TRUE" if cookie.secure else "FALSE",
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"0" if cookie.expires is None else str(cookie.expires),
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name,
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value,
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)) + "\n")
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def code_to_language(code, default=None):
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"""Map an ISO 639-1 language code to its actual name"""
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return CODES.get((code or "").lower(), default)
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def language_to_code(lang, default=None):
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"""Map a language name to its ISO 639-1 code"""
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if lang is None:
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return default
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lang = lang.capitalize()
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for code, language in CODES.items():
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if language == lang:
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return code
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return default
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CODES = {
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"ar": "Arabic",
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"bg": "Bulgarian",
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"ca": "Catalan",
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"cs": "Czech",
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"da": "Danish",
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"de": "German",
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"el": "Greek",
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"en": "English",
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"es": "Spanish",
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"fi": "Finnish",
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"fr": "French",
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"he": "Hebrew",
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"hu": "Hungarian",
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"id": "Indonesian",
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"it": "Italian",
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"ja": "Japanese",
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"ko": "Korean",
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"ms": "Malay",
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"nl": "Dutch",
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"no": "Norwegian",
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"pl": "Polish",
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"pt": "Portuguese",
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"ro": "Romanian",
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"ru": "Russian",
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"sv": "Swedish",
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"th": "Thai",
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"tr": "Turkish",
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"vi": "Vietnamese",
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"zh": "Chinese",
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}
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class UniversalNone():
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"""None-style object that supports more operations than None itself"""
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__slots__ = ()
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def __getattribute__(self, _):
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return self
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def __getitem__(self, _):
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return self
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@staticmethod
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def __bool__():
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return False
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@staticmethod
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def __str__():
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return "None"
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__repr__ = __str__
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NONE = UniversalNone()
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EPOCH = datetime.datetime(1970, 1, 1)
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SECOND = datetime.timedelta(0, 1)
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WINDOWS = (os.name == "nt")
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SENTINEL = object()
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SPECIAL_EXTRACTORS = {"oauth", "recursive", "test"}
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GLOBALS = {
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"parse_int": text.parse_int,
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"urlsplit" : urllib.parse.urlsplit,
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"datetime" : datetime.datetime,
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"abort" : raises(exception.StopExtraction),
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"terminate": raises(exception.TerminateExtraction),
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"re" : re,
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}
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def compile_expression(expr, name="<expr>", globals=GLOBALS):
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code_object = compile(expr, name, "eval")
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return functools.partial(eval, code_object, globals)
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def build_duration_func(duration, min=0.0):
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if not duration:
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return None
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try:
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lower, upper = duration
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except TypeError:
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pass
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else:
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return functools.partial(
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random.uniform,
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lower if lower > min else min,
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upper if upper > min else min,
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)
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return functools.partial(identity, duration if duration > min else min)
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def build_predicate(predicates):
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if not predicates:
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return lambda url, kwdict: True
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elif len(predicates) == 1:
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return predicates[0]
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return functools.partial(chain_predicates, predicates)
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def chain_predicates(predicates, url, kwdict):
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for pred in predicates:
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if not pred(url, kwdict):
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return False
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return True
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class RangePredicate():
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"""Predicate; True if the current index is in the given range"""
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def __init__(self, rangespec):
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self.ranges = self.optimize_range(self.parse_range(rangespec))
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self.index = 0
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if self.ranges:
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self.lower, self.upper = self.ranges[0][0], self.ranges[-1][1]
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else:
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self.lower, self.upper = 0, 0
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def __call__(self, url, _):
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self.index += 1
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if self.index > self.upper:
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raise exception.StopExtraction()
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for lower, upper in self.ranges:
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if lower <= self.index <= upper:
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return True
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return False
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@staticmethod
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def parse_range(rangespec):
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"""Parse an integer range string and return the resulting ranges
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Examples:
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parse_range("-2,4,6-8,10-") -> [(1,2), (4,4), (6,8), (10,INTMAX)]
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parse_range(" - 3 , 4- 4, 2-6") -> [(1,3), (4,4), (2,6)]
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"""
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ranges = []
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for group in rangespec.split(","):
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if not group:
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continue
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first, sep, last = group.partition("-")
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if not sep:
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beg = end = int(first)
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else:
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beg = int(first) if first.strip() else 1
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end = int(last) if last.strip() else sys.maxsize
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ranges.append((beg, end) if beg <= end else (end, beg))
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return ranges
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@staticmethod
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def optimize_range(ranges):
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"""Simplify/Combine a parsed list of ranges
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Examples:
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optimize_range([(2,4), (4,6), (5,8)]) -> [(2,8)]
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optimize_range([(1,1), (2,2), (3,6), (8,9))]) -> [(1,6), (8,9)]
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"""
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if len(ranges) <= 1:
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return ranges
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ranges.sort()
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riter = iter(ranges)
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result = []
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beg, end = next(riter)
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for lower, upper in riter:
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if lower > end+1:
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result.append((beg, end))
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beg, end = lower, upper
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elif upper > end:
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end = upper
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result.append((beg, end))
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return result
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class UniquePredicate():
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"""Predicate; True if given URL has not been encountered before"""
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def __init__(self):
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self.urls = set()
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def __call__(self, url, _):
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if url.startswith("text:"):
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return True
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if url not in self.urls:
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self.urls.add(url)
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return True
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return False
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class FilterPredicate():
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"""Predicate; True if evaluating the given expression returns True"""
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def __init__(self, expr, target="image"):
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name = "<{} filter>".format(target)
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self.expr = compile_expression(expr, name)
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def __call__(self, _, kwdict):
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try:
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return self.expr(kwdict)
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except exception.GalleryDLException:
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raise
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except Exception as exc:
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raise exception.FilterError(exc)
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class ExtendedUrl():
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"""URL with attached config key-value pairs"""
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def __init__(self, url, gconf, lconf):
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self.value, self.gconfig, self.lconfig = url, gconf, lconf
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def __str__(self):
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return self.value
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class DownloadArchive():
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def __init__(self, path, extractor):
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con = sqlite3.connect(path, timeout=60, check_same_thread=False)
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con.isolation_level = None
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self.close = con.close
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self.cursor = con.cursor()
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try:
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self.cursor.execute("CREATE TABLE IF NOT EXISTS archive "
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"(entry PRIMARY KEY) WITHOUT ROWID")
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except sqlite3.OperationalError:
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# fallback for missing WITHOUT ROWID support (#553)
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self.cursor.execute("CREATE TABLE IF NOT EXISTS archive "
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"(entry PRIMARY KEY)")
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self.keygen = (
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extractor.config("archive-prefix", extractor.category) +
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extractor.config("archive-format", extractor.archive_fmt)
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).format_map
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def check(self, kwdict):
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"""Return True if the item described by 'kwdict' exists in archive"""
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key = kwdict["_archive_key"] = self.keygen(kwdict)
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self.cursor.execute(
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"SELECT 1 FROM archive WHERE entry=? LIMIT 1", (key,))
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return self.cursor.fetchone()
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def add(self, kwdict):
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"""Add item described by 'kwdict' to archive"""
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key = kwdict.get("_archive_key") or self.keygen(kwdict)
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self.cursor.execute(
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|
"INSERT OR IGNORE INTO archive VALUES (?)", (key,))
|