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pwic_lib.py
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# Pwic.wiki server running on Python and SQLite
# Copyright (C) 2020-2025 Alexandre Bréard
#
# https://pwic.wiki
# https://github.com/gitbra/pwic
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from typing import Any, Dict, List, Optional, Tuple, Union
import sqlite3
import re
from collections import namedtuple, OrderedDict
from datetime import datetime, timedelta
from time import time
from os import urandom
from os.path import splitext
from hashlib import sha256
from base64 import b64encode
from string import ascii_lowercase, ascii_uppercase
from aiohttp import web
from html.parser import HTMLParser
from urllib.parse import urlparse
from urllib.request import Request, urlopen
TyEnv = namedtuple('TyEnv', 'pindep, pdep, online, private')
TyMime = namedtuple('TyMime', 'exts, mimes, magic, compressed')
TyRobotsDict = Dict[str, Optional[bool]]
CFBF = ['\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1']
MATROSKA = ['\x1A\x45\xDF\xA3']
XML = ['<']
ZIP = ['PK']
class PwicConst:
''' Constants used by Pwic.wiki '''
# ========
# System
# ========
VERSION = '1.2'
DB = './db'
DB_SQLITE = DB + '/pwic.sqlite'
DB_SQLITE_BACKUP = DB + '/pwic_%s.sqlite'
DB_SQLITE_AUDIT = DB + '/pwic_audit.sqlite'
DOCUMENTS_PATH = DB + '/documents/%s/'
LOCALE_PATH = './locale/'
TEMPLATES_PATH = './templates/'
BOOL_COLUMNS = ['admin', 'manager', 'editor', 'validator', 'reader', 'disabled', # roles
'initial', # users
'latest', 'draft', 'final', 'header', 'protection'] # pages
# ==========
# Security
# ==========
SALT = '' # Private random characters to secure the generated hashes for the passwords
PRIVATE_KEY = 'db/pwic_https.key'
PUBLIC_KEY = 'db/pwic_https.crt'
CHARS_UNSAFE = '\\/:;%*?=&#\'"!<>(){}[]|' # Various signs incompatible with filesystem, HTML, SQL...
MAGIC_OAUTH = 'OAuth'
NOT_PROJECT = ['', 'admin', 'api', 'bugs', 'issues', 'special', 'static', 'tracker']
NOT_PAGE = ['', 'special']
# ========
# Packed
# ========
USERS = {'anonymous': 'pwic_anonymous', # Account for the random visitors
'ghost': 'pwic_ghost', # Account for the deleted users (not implemented)
'system': 'pwic_system'} # Account for the technical operations
DEFAULTS = {'dt_mask': '%Y-%m-%d %H:%M:%S', # Fixed format of the datetime
'heading': '1.1.1.1.1.1.', # Default format of the paragraphs
'host': '127.0.0.1', # Default HTTP host when the server starts
'kb_mask': 'kb%06d', # Format for the KB pages
'language': 'en', # Default language-dependent template for the UI
'limit_filename': '128', # Max length for the file names
'limit_field': '2048', # Max length for the submitted inline strings
'logging_format': '%a %t "%r" %s %b', # HTTP log format
'odt_img_defpix': '150', # Unknown size of a picture for the export to ODT
'page': 'home', # Root page of every project
'password': 'initial', # Default password for the new accounts
'port': '8080', # Default HTTP port when the server starts
}
REGEXES = {'document': re.compile(r'\]\(\/special\/document\/([0-9]+)(\)|\/|\#|\?| ")'), # Find a document in Markdown
'document_imgsrc': re.compile(r'^\/?special\/document\/([0-9]+)([\#\?].*)?$'), # Find the picture ID in IMG.SRC
'empty_tag': re.compile(r'<\b(\w+)\b(?<!table)\b(?<!tr|th|td)><\/\1>', re.IGNORECASE), # Removable blank HTML tags, except table elements
'empty_tag_with_attrs': re.compile(r'<(\w+(?<!th|td))(\s+\w+="?\w+"?)*>(\s*)<\/\1>', re.IGNORECASE), # Removable blank HTML tags, except table elements
'adjacent_tag': re.compile(r'<\/(b|big|em|i|small|span|strong|sub|sup)[ \t]*>([ \t]*)<\1[ \t]*>', re.IGNORECASE), # Removable adjacent inline HTML tags
'kb_mask': re.compile(r'^kb[0-9]{6}$'), # Name of the pages KB
'length': re.compile(r'^(\d+(.\d*)?)(cm|mm|in|pt|pc|px|em)?$'), # Length in XML
'md_strip': re.compile(r'\([^\)]+\)|\*+|-+|\~+|\[|\]|\(|\)|`'), # QnD removal of Markdown
'mime': re.compile(r'^[a-z]+\/[a-z0-9\.\+\-]+$', re.IGNORECASE), # Check the format of the mime
'page': re.compile(r'\]\((\.|\/[^\/\#\?\)"]+)\/([^\/\#\?\)"]+)(\/rev[0-9]+)?(\#|\?|\)| ")'), # Find a page in Markdown
'protocol': re.compile(r'^https?:\/\/', re.IGNORECASE), # Valid protocols for the links
'search_terms': re.compile(r'(-?)("[^"\n]+"|[^ \n]+)[\t ]*', re.IGNORECASE), # Split the search terms
'tag_name': re.compile(r'<\/?([a-z]+)[ >]', re.IGNORECASE), # Find the HTML tags
'tag_all': re.compile(r'<\/?\w+( [^>]+)?>', re.IGNORECASE), # Tag in HTML
'tag_comment': re.compile(r'<!--.*-->', re.IGNORECASE), # Comment in HTML
}
# =========
# Options
# =========
ENV = {'api_cors': TyEnv(True, False, False, False),
'api_expose_markdown': TyEnv(True, True, False, False),
'api_restrict': TyEnv(True, True, True, False),
'audit_range': TyEnv(True, True, True, False),
'auto_join': TyEnv(False, True, True, False),
'base_url': TyEnv(True, False, False, False),
'client_size_max': TyEnv(True, False, False, False),
'compressed_cache': TyEnv(True, False, False, False),
'copyright_years': TyEnv(True, True, True, False),
'css': TyEnv(True, True, False, False),
'css_dark': TyEnv(True, True, False, False),
'css_printing': TyEnv(True, True, False, False),
'dark_theme': TyEnv(True, True, True, False),
'db_async': TyEnv(True, False, False, False),
'document_name_regex': TyEnv(True, True, False, False),
'document_pixels_max': TyEnv(True, True, True, False),
'document_size_max': TyEnv(True, True, False, False),
'edit_time_min': TyEnv(True, True, False, False),
'emojis': TyEnv(True, True, True, False),
'export_project_revisions': TyEnv(True, True, False, False),
'feed_size': TyEnv(True, True, True, False),
'file_formats_disabled': TyEnv(True, True, True, False),
'fixed_templates': TyEnv(True, False, False, False),
'heading_mask': TyEnv(True, True, True, False),
'http_404': TyEnv(True, True, True, False),
'http_log_file': TyEnv(True, False, False, False),
'http_log_format': TyEnv(True, False, False, False),
'http_referer': TyEnv(True, False, False, False),
'https': TyEnv(True, False, False, False),
'ip_filter': TyEnv(True, False, False, False),
'kbid': TyEnv(True, True, False, False),
'keep_drafts': TyEnv(True, True, True, False),
'keep_sessions': TyEnv(True, False, False, False),
'language': TyEnv(True, True, True, False),
'legal_notice': TyEnv(True, True, False, False),
'link_new_tab': TyEnv(True, True, True, False),
'link_nofollow': TyEnv(True, True, True, False),
'magic_bytes': TyEnv(True, False, False, False),
'maintenance': TyEnv(True, False, False, False),
'manifest': TyEnv(True, True, True, False),
'mathjax': TyEnv(True, True, True, False),
'message': TyEnv(True, True, True, False),
'no_cache': TyEnv(True, True, False, False),
'no_copy_code': TyEnv(True, True, True, False),
'no_document_conversion': TyEnv(True, True, True, False),
'no_document_list': TyEnv(True, True, True, False),
'no_export_project': TyEnv(True, True, False, False),
'no_feed': TyEnv(True, True, True, False),
'no_graph': TyEnv(True, True, True, False),
'no_heading': TyEnv(True, True, True, False),
'no_help': TyEnv(True, True, True, False),
'no_highlight': TyEnv(True, False, False, False),
'no_history': TyEnv(True, True, True, False),
'no_link_review': TyEnv(True, True, True, False),
'no_login': TyEnv(True, False, False, False),
'no_new_user': TyEnv(True, True, False, False),
'no_printing': TyEnv(True, True, True, False),
'no_search': TyEnv(True, True, True, False),
'no_sitemap': TyEnv(True, True, True, False),
'no_sort_table': TyEnv(True, True, True, False),
'no_space_page': TyEnv(True, True, True, False),
'no_table_csv': TyEnv(True, True, True, False),
'no_text_selection': TyEnv(True, True, True, False),
'oauth_domains': TyEnv(True, False, False, False),
'oauth_identifier': TyEnv(True, False, False, False),
'oauth_provider': TyEnv(True, False, False, False),
'oauth_secret': TyEnv(True, False, False, True),
'oauth_tenant': TyEnv(True, False, False, False),
'odata': TyEnv(True, False, False, False),
'odt_image_height_max': TyEnv(True, True, True, False),
'odt_image_width_max': TyEnv(True, True, True, False),
'odt_page_height': TyEnv(True, True, True, False),
'odt_page_landscape': TyEnv(True, True, True, False),
'odt_page_margin': TyEnv(True, True, True, False),
'odt_page_width': TyEnv(True, True, True, False),
'page_count_max': TyEnv(True, True, False, False),
'password_regex': TyEnv(True, False, False, False),
'project_size_max': TyEnv(True, True, False, False),
'pwic_audit_id': TyEnv(True, False, False, True),
'pwic_session': TyEnv(True, False, False, True),
'quick_fix': TyEnv(True, True, True, False),
'remote_url': TyEnv(True, False, False, False),
'registration_link': TyEnv(True, False, False, False),
'revision_count_max': TyEnv(True, True, False, False),
'revision_size_max': TyEnv(True, True, False, False),
'robots': TyEnv(True, True, False, False),
'rstrip': TyEnv(True, True, True, False),
'seo_hide_revs': TyEnv(True, True, False, False),
'session_expiry': TyEnv(True, False, False, False),
'show_members_max': TyEnv(True, True, True, False),
'skipped_tags': TyEnv(True, True, False, False),
'strict_cookies': TyEnv(True, False, False, False),
'support_email': TyEnv(True, True, True, False),
'support_phone': TyEnv(True, True, True, False),
'support_text': TyEnv(True, True, True, False),
'support_url': TyEnv(True, True, True, False),
'title': TyEnv(True, True, True, False),
'totp': TyEnv(True, False, False, False),
'validated_only': TyEnv(True, True, True, False),
'zip_no_exec': TyEnv(True, True, False, False),
}
# ===============
# Miscellaneous
# ===============
DPI = 120. # Pixels per inch
RTL = ['ar', 'fa', 'he'] # RTL languages
VOID_HTML = ['area', 'base', 'br', 'col', 'embed',
'hr', 'img', 'input', 'link', 'meta',
'source', 'track', 'wbr'] # Self-closing HTML tags
USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36'
# ========
# Emojis
# ========
EMOJIS = {'alien': '👽',
'atom': '⚛️',
'bang': '💥',
'brick': '🧱',
'calendar': '📅',
'camera': '🎥', # 1F4F9
'chains': '🔗',
'check': '✔️',
'clamp': '🗜️',
'clock': '⏰',
'cloud': '☁️',
'curved_left_arrow': '↩️',
'dice': '🎲',
'door': '🚪',
'double': '⚋',
'eye': '👁️',
'finger_left': '👈',
'finger_up': '☝️',
'flag': '🏁',
'gemini': '♊',
'glasses': '👓',
'globe': '🌐',
'green_check': '✅',
'hammer': '🔨',
'headphone': '🎧',
'help': '📚',
'home': '🏠',
'hourglass': '⏳',
'id': '🆔',
'image': '🖼️',
'inbox': '📥',
'key': '🔑',
'laptop': '💻',
'left': '≪',
'locked': '🔒',
'map': '🗺️',
'noblank': '⋛',
'notes': '📋',
'oneline': '⪥',
'outbox': '📤',
'padlock': '🔐',
'paperclip': '📎',
'pill': '💊',
'pin': '📌',
'plug': '🔌',
'plus': '➕',
'printer': '🖨️',
'recycle': '♻️',
'red_check': '❌',
'refresh': '🔄',
'right': '≫',
'round_arrow_left': '⟲',
'round_arrow_right': '⟳',
'rss': '🔊',
'save': '💾',
'scroll': '📜',
'search': '🔍',
'server': '🖥️',
'set_square': '📐',
'sheet': '📄',
'slot': '🎰',
'sparkles': '✨',
'star': '⭐',
'top': '🔝',
'trashcan': '🗑️',
'truck': '🚚',
'unlocked': '🔓',
'updown': '🔃',
'users': '👥',
'validate': '👌',
'warning': '⚠️',
'watch': '⌚',
}
# =======
# Mimes
# https://www.iana.org/assignments/media-types/media-types.xhtml
# ./pa show-mime
# =======
MIMES = [TyMime([''], ['application/octet-stream'], None, False),
TyMime(['7z'], ['application/x-7z-compressed'], ['7z'], True),
TyMime(['aac'], ['audio/vnd.dlna.adts'], None, True),
TyMime(['abw'], ['application/x-abiword'], None, False),
TyMime(['accdb'], ['application/msaccess'], ['\x00\x01\x00\x00Standard ACE DB'], False), # NUL SOH NUL NUL
TyMime(['aif', 'aifc', 'aiff'], ['audio/aiff', 'audio/x-aiff'], ['AIFF', 'FORM'], True),
TyMime(['apk'], ['application/vnd.android.package-archive'], ZIP, True),
TyMime(['atom'], ['application/atom+xml'], XML, True),
TyMime(['avi'], ['video/avi', 'video/x-msvideo'], ['AVI', 'RIFF'], True),
TyMime(['avif'], ['image/avif'], None, True),
TyMime(['bin'], ['application/octet-stream'], None, True),
TyMime(['bmp'], ['image/bmp'], ['BM'], False),
TyMime(['bz'], ['application/x-bzip'], ['BZ'], True),
TyMime(['bz2'], ['application/x-bzip2'], ['BZ'], True),
TyMime(['cab'], ['application/vnd.ms-cab-compressed'], None, True),
TyMime(['cer'], ['application/x-x509-ca-cert', 'application/pkix-cert'], None, False),
TyMime(['chm'], ['application/vnd.ms-htmlhelp'], ['ITSM'], False),
TyMime(['crt'], ['application/x-x509-ca-cert'], None, False),
TyMime(['css'], ['text/css'], None, False),
TyMime(['csv'], ['text/csv', 'application/vnd.ms-excel'], None, False),
TyMime(['deb'], ['application/x-debian-package'], ZIP, True),
TyMime(['der'], ['application/x-x509-ca-cert'], None, False),
TyMime(['dll'], ['application/x-msdownload', 'application/x-msdos-program'], ['MZ'], False),
TyMime(['doc'], ['application/msword'], CFBF, False),
TyMime(['docm'], ['application/vnd.ms-word.document.macroEnabled.12'], ZIP, True),
TyMime(['docx'], ['application/vnd.openxmlformats-officedocument.wordprocessingml.document'], ZIP, True),
TyMime(['dotm'], ['application/vnd.ms-word.template.macroEnabled.12'], ZIP, True),
TyMime(['dotx'], ['application/vnd.openxmlformats-officedocument.wordprocessingml.template'], ZIP, True),
TyMime(['dwg'], ['image/vnd.dwg'], None, False),
TyMime(['dxf'], ['image/vnd.dxf'], None, False),
TyMime(['emf'], ['image/x-emf', 'image/emf'], None, False),
TyMime(['eml'], ['message/rfc822'], None, False),
TyMime(['eps'], ['application/postscript'], None, False),
TyMime(['epub'], ['application/epub+zip'], ZIP, True),
TyMime(['exe'], ['application/x-msdownload', 'application/x-ms-dos-executable'], ['MZ'], False),
TyMime(['flac'], ['audio/x-flac', 'audio/flac'], ['fLaC'], True),
TyMime(['flv'], ['video/x-flv'], ['FLV'], False),
TyMime(['gif'], ['image/gif'], ['GIF87a', 'GIF89a'], True),
TyMime(['gv'], ['text/vnd.graphviz'], None, False),
TyMime(['gz', 'gzip'], ['application/x-gzip', 'application/gzip'], ['\x1F\x8B'], True),
TyMime(['heif'], ['image/heif'], None, True),
TyMime(['hlp'], ['application/winhlp'], None, False),
TyMime(['htm', 'html'], ['text/html'], None, False),
TyMime(['ico'], ['image/x-icon', 'image/vnd.microsoft.icon'], ['\x00\x00\x01\x00'], False),
TyMime(['ics'], ['text/calendar'], None, False),
TyMime(['jar'], ['application/java-archive'], ZIP, True),
TyMime(['jp2'], ['image/jp2'], ['\x00\x00\x00\xFFjP'], True),
TyMime(['jpg', 'jpeg'], ['image/jpeg'], ['\xFF\xD8\xFF'], True),
TyMime(['js'], ['application/javascript'], None, False),
TyMime(['json'], ['application/json'], None, False),
TyMime(['kml'], ['application/vnd.google-earth.kml+xml'], None, False),
TyMime(['kmz'], ['application/vnd.google-earth.kmz'], ZIP, True),
TyMime(['latex'], ['application/x-latex'], None, False),
TyMime(['m4a'], ['audio/mp4'], None, True),
TyMime(['md'], ['text/markdown'], None, False),
TyMime(['mdb'], ['application/msaccess'], ['\x00\x01\x00\x00Standard Jet DB'], False), # NUL SOH NUL NUL
TyMime(['mid', 'midi'], ['audio/mid', 'audio/sp-midi'], ['MThd'], False),
TyMime(['mka', 'mkv'], ['video/x-matroska'], MATROSKA, True),
TyMime(['mov'], ['video/quicktime'], None, True),
TyMime(['mp3'], ['audio/mpeg'], ['\xFF\xFB', '\xFF\xF3', '\xFF\xF2'], True),
TyMime(['mp4'], ['video/mp4'], ['ftypisom'], True),
TyMime(['mpg', 'mpeg'], ['video/mpeg'], ['\x00\x00\x01\xB3'], True),
TyMime(['mpp'], ['application/vnd.ms-project'], None, False),
TyMime(['oda'], ['application/oda'], None, False),
TyMime(['odf'], ['application/vnd.oasis.opendocument.formula'], ZIP, True),
TyMime(['odg'], ['application/vnd.oasis.opendocument.graphics'], ZIP, True),
TyMime(['odi'], ['application/vnd.oasis.opendocument.image'], None, False),
TyMime(['odp'], ['application/vnd.oasis.opendocument.presentation'], ZIP, True),
TyMime(['ods'], ['application/vnd.oasis.opendocument.spreadsheet'], ZIP, True),
TyMime(['odt'], ['application/vnd.oasis.opendocument.text'], ZIP, True),
TyMime(['oga', 'ogg'], ['audio/ogg'], None, True),
TyMime(['ogv'], ['video/ogg'], None, True),
TyMime(['one'], ['application/msonenote'], None, False),
TyMime(['otf'], ['application/x-font-otf'], None, False),
TyMime(['otp'], ['application/vnd.oasis.opendocument.presentation-template'], ZIP, True),
TyMime(['pdf'], ['application/pdf'], ['%PDF-'], False),
TyMime(['pdfxml'], ['application/vnd.adobe.pdfxml'], None, False),
TyMime(['png'], ['image/png'], ['\x89PNG'], True),
TyMime(['pot', 'pps', 'ppt'], ['application/vnd.ms-powerpoint'], CFBF, False),
TyMime(['potm'], ['application/vnd.ms-powerpoint.template.macroEnabled.12'], ZIP, True),
TyMime(['potx'], ['application/vnd.openxmlformats-officedocument.presentationml.template'], ZIP, True),
TyMime(['ppsm'], ['application/vnd.ms-powerpoint.slideshow.macroEnabled.12'], ZIP, True),
TyMime(['ppsx'], ['application/vnd.openxmlformats-officedocument.presentationml.slideshow'], ZIP, True),
TyMime(['pptm'], ['application/vnd.ms-powerpoint.presentation.macroEnabled.12'], ZIP, True),
TyMime(['pptx'], ['application/vnd.openxmlformats-officedocument.presentationml.presentation'], ZIP, True),
TyMime(['ps'], ['application/postscript'], ['%!PS'], False),
TyMime(['psd'], ['image/vnd.adobe.photoshop'], None, False),
TyMime(['pub'], ['application/vnd.ms-publisher'], CFBF, False),
TyMime(['rar'], ['application/x-rar-compressed', 'application/vnd.rar'], ['Rar!\x1A\x07\x00', 'Rar!\x1A\x07\x01'], True),
TyMime(['rss'], ['application/rss+xml', 'application/x-rss+xml'], XML, False),
TyMime(['rtf'], ['application/rtf'], ['{\rtf1'], False),
TyMime(['sqlite'], ['application/vnd.sqlite3'], ['SQLite format 3\x00'], False),
TyMime(['stc'], ['application/vnd.sun.xml.calc.template'], None, False),
TyMime(['std'], ['application/vnd.sun.xml.draw.template'], None, False),
TyMime(['sti'], ['application/vnd.sun.xml.impress.template'], None, False),
TyMime(['svg'], ['image/svg+xml'], XML, False),
TyMime(['swf'], ['application/x-shockwave-flash', 'application/vnd.adobe.flash.movie'], ['CWS', 'FWS'], False),
TyMime(['sxc'], ['application/vnd.sun.xml.calc'], None, False),
TyMime(['sxd'], ['application/vnd.sun.xml.draw'], None, False),
TyMime(['sxi'], ['application/vnd.sun.xml.impress'], None, False),
TyMime(['sxm'], ['application/vnd.sun.xml.math'], None, False),
TyMime(['sxw'], ['application/vnd.sun.xml.writer'], None, False),
TyMime(['tar'], ['application/x-tar'], ['ustar\x0000', 'ustar \x00'], True),
TyMime(['tgz'], ['application/x-compressed'], ['\x1F\x8B'], True),
TyMime(['tif', 'tiff'], ['image/tiff'], ['II*\x00', 'II\x00*'], False),
TyMime(['tsv'], ['text/tab-separated-values'], None, False),
TyMime(['ttf'], ['application/x-font-ttf', 'font/ttf'], None, False),
TyMime(['txt'], ['text/plain'], None, False),
TyMime(['vcf'], ['text/x-vcard', 'text/vcard'], None, False),
TyMime(['vsd'], ['application/vnd.ms-visio.viewer'], CFBF, False),
TyMime(['vsdm', 'vsdx'], ['application/vnd.ms-visio.viewer'], ZIP, True),
TyMime(['wav'], ['audio/wav', 'audio/x-wav'], ['WAV', 'RIFF'], False),
TyMime(['weba'], ['audio/webm'], None, True),
TyMime(['webm'], ['video/webm'], MATROSKA, True),
TyMime(['webp'], ['image/webp'], ['WEBP', 'RIFF'], True),
TyMime(['wma'], ['audio/x-ms-wma'], None, True),
TyMime(['wmf'], ['image/x-wmf', 'image/wmf'], None, False),
TyMime(['wmv'], ['video/x-ms-wmv'], None, True),
TyMime(['woff'], ['application/x-font-woff', 'font/woff'], None, False),
TyMime(['woff2'], ['application/x-font-woff', 'font/woff2'], ['wOF2'], True),
TyMime(['xaml'], ['application/xaml+xml'], None, False),
TyMime(['xla', 'xls', 'xlm'], ['application/vnd.ms-excel'], CFBF, False),
TyMime(['xlsb'], ['application/vnd.ms-excel.sheet.binary.macroEnabled.12'], ZIP, True),
TyMime(['xlsm'], ['application/vnd.ms-excel.sheet.macroEnabled.12'], ZIP, True),
TyMime(['xlsx'], ['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'], ZIP, True),
TyMime(['xml'], ['text/xml', 'application/xml'], XML, False),
TyMime(['xsl', 'xslt'], ['text/xml', 'application/xslt+xml'], XML, False),
TyMime(['yaml'], ['text/yaml'], None, False),
TyMime(['z'], ['application/x-compress'], ['\x1F\xA0'], True),
TyMime(['zip'], ['application/x-zip-compressed', 'application/zip'], ZIP, True),
]
EXECS = ['bat', 'cat', 'cmd', 'com', 'dll', 'docm', 'drv', 'exe', 'potm', 'ppsm', 'pptm', 'ps1', 'scr', 'sh', 'sys', 'vbs', 'xlsm', 'zsh']
class PwicError(Exception):
''' Generic exception for Pwic.wiki '''
class PwicLib:
# ========
# System
# ========
@staticmethod
def audit(sql: sqlite3.Cursor, obj: Dict[str, Union[str, int]], request: Optional[web.Request] = None) -> None:
''' Save an event into the audit log '''
from pwic_extension import PwicExtension
# Check
if obj.get('event') in [None, '']:
raise PwicError
if request is not None:
obj['ip'] = PwicExtension.on_ip_header(request)
if PwicExtension.on_audit_skip(sql, request, obj.copy()):
return
# Log the event
dt = PwicLib.dt()
sql.execute(''' INSERT INTO audit.audit (date, time, author, event, user, project, page, reference, string, ip)
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ''',
(str(obj.get('date', dt['date'])),
str(obj.get('time', dt['time'])),
str(obj.get('author', PwicConst.USERS['anonymous'])),
str(obj.get('event', '')),
str(obj.get('user', '')),
str(obj.get('project', '')),
str(obj.get('page', '')),
PwicLib.intval(obj.get('reference', 0)),
str(obj.get('string', '')),
str(obj.get('ip', '')),
))
if sql.rowcount != 1:
raise PwicError
# Specific event
try:
PwicExtension.on_audit(sql, request, obj)
except Exception: # nosec B110
pass
@staticmethod
def connect(dbfile: str = PwicConst.DB_SQLITE,
dbaudit: Optional[str] = PwicConst.DB_SQLITE_AUDIT,
trace: bool = False,
in_memory: bool = True,
asynchronous: bool = False,
vacuum: bool = False,
) -> Tuple[sqlite3.Connection, sqlite3.Cursor]:
''' Connect to the database with the relevant options '''
# Connection
db = sqlite3.connect(dbfile)
db.row_factory = PwicLib.row_factory
if trace:
db.set_trace_callback(PwicLib.sql_print)
# Cursor and options
sql = db.cursor()
attached = dbaudit is not None
if attached:
sql.execute(''' ATTACH DATABASE ? AS audit''', (dbaudit, ))
if in_memory:
sql.execute(''' PRAGMA main.journal_mode = MEMORY''')
if attached:
sql.execute(''' PRAGMA audit.journal_mode = MEMORY''')
if asynchronous or (PwicLib.option(sql, '', 'db_async') is not None):
sql.execute(''' PRAGMA main.synchronous = OFF''')
if attached:
sql.execute(''' PRAGMA audit.synchronous = OFF''')
if vacuum:
sql.execute(''' VACUUM main''')
if attached:
sql.execute(''' VACUUM audit''')
return db, sql
@staticmethod
def detect_language(request: web.Request, allowed_langs: List[str], sso: bool = False) -> str:
''' Detect the default language of the user from the HTTP headers '''
# Detect from the HTTP headers
head = request.headers.get('Accept-Language', '')
langs = PwicLib.list(head.replace(',', ' ').replace(';', ' '))
result = PwicConst.DEFAULTS['language']
for e in langs:
if '-' in e:
e = e[:2]
if e in allowed_langs:
result = e
break
# Custom detection
from pwic_extension import PwicExtension
return PwicExtension.on_language_detected(request, result, allowed_langs, sso)
# ====================
# Reusable functions
# ====================
@staticmethod
def attachment_name(name: str) -> str:
''' Return the file name for a proper download '''
return "=?utf-8?B?%s?=" % (b64encode(name.encode()).decode())
@staticmethod
def convert_length(value: Optional[Union[str, int, float]], target_unit: str, precision: int, dpi: float = PwicConst.DPI) -> str:
''' Convert a length from a unit to another one '''
# Conversion factors
factors = {'cm': (dpi / 2.54, 'px'),
'mm': (0.1, 'cm'),
'in': (2.54, 'cm'),
'pt': (1. / 72., 'in'),
'pc': (12., 'pt'),
'px': (1., 'px'),
'em': (0., 'px'), # Relative length
'': (1., '')}
# Read the input value
if (value is None) or (target_unit not in factors):
return '0'
if not isinstance(value, str):
length = float(value)
unit = 'px'
else:
value = value.strip().replace(' ', '').replace(',', '.').lower()
m = PwicConst.REGEXES['length'].match(value)
if m is None:
return '0'
try:
length = float(m.group(1))
except ValueError:
return '0'
unit = m.group(3) or 'px'
# Convert to pixels
while True:
(k, unit) = factors[unit]
length *= k
if unit == 'px':
break
# Convert to the target unit
length /= factors[target_unit][0]
return str(round(length, precision)) + target_unit
@staticmethod
async def download_str(url: str, root_mime: str = '') -> Optional[str]:
# Check
pu = urlparse(url)
if (pu.scheme not in ['http', 'https']) or ('\\' in pu.path) or ('..' in pu.path):
return None
# Download
from pwic_extension import PwicExtension
try:
req = Request(url, headers={'User-Agent': PwicConst.USER_AGENT})
PwicExtension.on_download_pre(url, req)
with urlopen(req) as response:
data = response.read()
if response.headers.get('Content-Type', '')[:len(root_mime)] != root_mime:
del data
return None
return data.decode(response.info().get_content_charset('utf-8'))
except Exception:
return None
@staticmethod
def dt(days: int = 0) -> Dict[str, str]:
''' Return some key dates and time '''
from pwic_extension import PwicExtension
curtime = datetime.now(tz=PwicExtension.on_timezone())
return {'date': str(curtime)[:10],
'date-30d': str(curtime - timedelta(days=30))[:10],
'date-90d': str(curtime - timedelta(days=90))[:10],
'date-nd': str(curtime - timedelta(days=days))[:10],
'time': str(curtime)[11:19]}
@staticmethod
def dt_diff(date1: str, date2: str) -> int:
''' Calculate the number of days between 2 dates '''
if date1 > date2:
date1, date2 = date2, date1
d1 = datetime.strptime(date1 + ' 00:00:00', PwicConst.DEFAULTS['dt_mask'])
d2 = datetime.strptime(date2 + ' 00:00:00', PwicConst.DEFAULTS['dt_mask'])
return (d2 - d1).days
@staticmethod
def dt2rfc822(sdate: str, stime: str) -> str:
''' Convert a local date&time or a complete date/time to RFC 822
The time zone may be provided by PwicExtension.on_timezone()
'''
from pwic_extension import PwicExtension
curtime = datetime.strptime(f'{sdate} {stime}', PwicConst.DEFAULTS['dt_mask'])
curtime = curtime.replace(tzinfo=PwicExtension.on_timezone())
return datetime.strftime(curtime, '%a, %d %b %Y %H:%M:%S %Z').replace('UTC', 'UT').strip()
@staticmethod
def flag(flag: str) -> str:
''' Convert a country in ISO format to emoji '''
# Check the parameter
flag = flag.strip().lower()
if len(flag) != 2:
return ''
# Build the unicode flag
emoji = ''
for i in range(2):
if flag[i] in ascii_lowercase:
emoji += chr(ascii_lowercase.find(flag[i]) + 0x1F1E6)
else:
return ''
return emoji
@staticmethod
def floatval(value: Any) -> float:
''' Safe conversion to float '''
try:
return float(value)
except (ValueError, TypeError):
return 0.0
@staticmethod
def intval(value: Any, base=10) -> int:
''' Safe conversion to integer in the chosen base '''
try:
if base != 10:
return int(value, base)
return int(float(value) if '.' in str(value) else value)
except (ValueError, TypeError):
return 0
@staticmethod
def is_hex(value: str) -> bool:
''' Check if the value is a non-zero hexadecimal value '''
return PwicLib.intval(str(value), base=16) > 0
@staticmethod
def list(inputstr: Optional[str], do_sort: bool = False) -> List[str]:
''' Build a list of unique values from a string and keep the initial order (by default) '''
if inputstr is None:
inputstr = ''
inputstr = PwicLib.recursive_replace(inputstr.replace('\r', ' ').replace('\n', ' ').replace('\t', ' '), ' ', ' ').strip()
values = [] if inputstr == '' else list(OrderedDict((e, None) for e in inputstr.split(' ')))
if do_sort:
values.sort()
return values
@staticmethod
def list_tags(tags: str) -> str:
''' Reorder a list of tags written as a string '''
return ' '.join(PwicLib.list(tags.replace('#', '').lower(), do_sort=True))
@staticmethod
def nns(value: Optional[str]) -> str:
''' Return a non-null string '''
return str('' if value is None else value)
@staticmethod
def no_html(value: str) -> str:
''' Remove the HTML tags from a string '''
value = value.replace(' ', ' ')
while True:
i = len(value)
value = PwicConst.REGEXES['tag_all'].sub('', value)
value = PwicConst.REGEXES['tag_comment'].sub('', value)
if len(value) == i:
break
return value
@staticmethod
def no_md(value: str) -> str:
return PwicConst.REGEXES['md_strip'].sub('', value)
@staticmethod
def option(sql: Optional[sqlite3.Cursor],
project: Optional[str],
name: str,
default: Optional[str] = None,
) -> Optional[str]:
''' Read a variable from the table ENV that can be project-dependent or not '''
if (sql is None) or (name not in PwicConst.ENV):
return default
try:
query = ''' SELECT value
FROM env
WHERE project = ?
AND key = ?
AND value <> '' '''
if project is None:
project = ''
# Read by project
if not PwicConst.ENV[name].pdep:
project = ''
if project == '':
row = None
else:
row = sql.execute(query, (project, name)).fetchone()
# Read globally
if (row is None) and PwicConst.ENV[name].pindep:
project = ''
row = sql.execute(query, (project, name)).fetchone()
# Result
return default if row is None else row['value']
except sqlite3.OperationalError: # During init-db
return default
@staticmethod
def random_hash() -> str:
''' Generate a random 64-char-long string '''
return PwicLib.sha256(str(urandom(64)))[:32] + PwicLib.sha256(str(urandom(64)))[32:]
@staticmethod
def read_attr(attrs: List[Tuple[str, Optional[str]]], key: str, default: str = '') -> str:
''' Read a list of tuples by the first field and return the value in the second field '''
for (k, v) in attrs:
if k == key:
return PwicLib.nns(v)
return default
@staticmethod
def read_attr_key(attrs: List[Tuple[str, Optional[str]]], key: str) -> bool:
''' Check a list of tuples by the first field '''
for k in attrs:
if k[0] == key:
return True
return False
@staticmethod
def recursive_replace(text: str, search: Any, replace: str, strip: bool = True) -> str:
''' Replace a string recursively '''
while True:
curlen = len(text)
text = text.replace(search, replace)
if len(text) == curlen:
break
if strip:
text = text.strip()
return text
@staticmethod
def reserved_user_name(user: str) -> str:
user = str(user)
return (user == '') or ((user[:4].lower() == 'pwic') and ('@' not in user))
@staticmethod
def robots2str(robots: TyRobotsDict) -> str:
''' Convert structured boolean values into a meta string robots '''
return ' '.join([('' if robots[k] else 'no') + k for k in robots if robots[k] is not None])
@staticmethod
def row_factory(cursor: sqlite3.Cursor, row: Tuple[Any, ...]) -> Dict[str, Any]:
''' Assign names to the SQL output '''
d = {}
for idx, col in enumerate(cursor.description):
if col[0] in PwicConst.BOOL_COLUMNS:
d[col[0]] = PwicLib.xb(row[idx])
elif ((col[0] == 'value') or ('markdown' in col[0])) and isinstance(row[idx], str):
d[col[0]] = row[idx].replace('\r', '')
else:
d[col[0]] = row[idx]
return d
@staticmethod
def safe_file_name(name: str) -> str:
''' Ensure that a file name is acceptable '''
name = PwicLib.safe_name(name, extra='').replace(' ', '_').replace('\t', '_')
name = PwicLib.recursive_replace(name, '..', '.')
name = PwicLib.recursive_replace(name, '__', '_')
return '' if name[:1] == '.' else name
@staticmethod
def safe_name(name: Optional[str], extra: str = '.@') -> str:
''' Ensure that a string will not collide with the reserved characters of the operating system '''
if name is None:
return ''
chars = PwicConst.CHARS_UNSAFE + extra
for c in chars:
name = name.replace(c, '')
return name.strip().lower()[:PwicLib.intval(PwicConst.DEFAULTS['limit_filename'])]
@staticmethod
def safe_user_name(name: Optional[str]) -> str:
''' Ensure that a user name is acceptable '''
return PwicLib.safe_name(name, extra='')
@staticmethod
def sha256(value: Union[str, bytearray], salt: bool = True) -> str:
''' Calculate the SHA256 as string for the given value '''
if isinstance(value, bytearray):
if salt:
raise PwicError
return sha256(value).hexdigest()
text = (PwicConst.SALT if salt else '') + str(value)
return sha256(text.encode()).hexdigest()
@staticmethod
def sha256_file(filename: str) -> str:
''' Calculate the SHA256 as string for the given file '''
try:
hashval = sha256()
with open(filename, 'rb') as f:
for block in iter(lambda: f.read(4096), b''):
hashval.update(block)
return hashval.hexdigest()
except FileNotFoundError:
return ''
@staticmethod
def shrink(value: Optional[str]) -> str:
''' Convert a string into its shortest value in lower case '''
if value is None:
return ''
return value.replace('\r', '').replace('\n', '').replace('\t', '').replace(' ', '').strip().lower()
@staticmethod
def size2str(size: Union[int, float]) -> str:
''' Convert a size to a readable format '''
units = ' kMGTPEZ'
for i in range(len(units)):
if size < 1024:
break
size /= 1024
return ('%.1f %sB' % (size, units[i].strip())).replace('.0 ', ' ')
@staticmethod
def sql_print(query: Optional[str]) -> None:
''' Quick and dirty callback to print the SQL queries on a single line for debugging purposes '''
if query is not None:
dt = PwicLib.dt()
print('[%s %s] %s' % (dt['date'],
dt['time'],
' '.join([PwicLib.recursive_replace(q.strip().replace('\r', '').replace('\t', ' '), ' ', ' ') for q in query.split('\n')])))
@staticmethod
def str2bytearray(inputstr: str) -> bytearray:
''' Convert string to bytearray '''
barr = bytearray() # =bytearray(bytes.encode()) breaks the bytes sequence due to the encoding
for c in inputstr:
barr.append(ord(c))
return barr
@staticmethod
def str2robots(robots: str) -> TyRobotsDict:
''' Convert a meta string robots into structured boolean values '''
values = PwicLib.list(robots)
result: TyRobotsDict = {}
for k in ['archive', 'follow', 'imageindex', 'index', 'snippet', 'translate']:
if 'no' + k in values:
result[k] = False
elif k in values:
result[k] = True
else:
result[k] = None
return result
@staticmethod
def timestamp() -> int:
''' Returns the current time stamp '''
return PwicLib.intval(time())
@staticmethod
def x(value: Any) -> str:
''' Reduce an input value to a boolean string '''
return '' if value in [None, 'none', 'None', 'NONE', 'null', 'Null', 'NULL', '', 0, '0', False, 'false', 'False', 'FALSE', '-', '~', 'no', 'No', 'NO', 'off', 'Off', 'OFF', 'undefined'] else 'X'
@staticmethod
def xb(value: str) -> bool:
''' Convert 'X' to a boolean value '''
return value == 'X'
# =======
# Mimes
# =======
@staticmethod
def file_ext(filename: str) -> str:
''' Return the file extension of the file '''
return splitext(filename)[1][1:].strip().lower()
@staticmethod
def magic_bytes(ext: str) -> Optional[List[str]]:
''' Return the magic bytes that corresponds to the file extension '''
ext = ext.strip().lower()
for item in PwicConst.MIMES:
if ext in item.exts:
return item.magic
return None
@staticmethod
def mime(ext: str) -> Optional[str]:
''' Return the default mime that corresponds to the file extension '''
values = PwicLib.mime_list(ext)
return None if len(values) == 0 else values[0]
@staticmethod
def mime_compressed(ext: str) -> bool:
''' Return the possible state of compression based on the file extension '''
ext = ext.strip().lower()
for item in PwicConst.MIMES:
if ext in item.exts:
return item.compressed
return False
@staticmethod
def mime_list(ext: str) -> List[str]:
''' Return the possible mimes that correspond to the file extension '''
ext = ext.strip().lower()
for item in PwicConst.MIMES:
if ext in item.exts:
return item.mimes
return []
@staticmethod
def mime2icon(mime: str) -> str:
''' Return the emoji that corresponds to the MIME '''
if mime[:6] == 'image/':
return PwicConst.EMOJIS['image']
if mime[:6] == 'video/':
return PwicConst.EMOJIS['camera']
if mime[:6] == 'audio/':
return PwicConst.EMOJIS['headphone']
if mime[:12] == 'application/':
return PwicConst.EMOJIS['server']
return PwicConst.EMOJIS['sheet']
@staticmethod
def mime_zipped(ext: str) -> bool:
''' Return if a file extension is a disguised ZIP file '''
ext = ext.strip().lower()
for item in PwicConst.MIMES:
if ext in item.exts:
return item.magic == ZIP
return False
# ===============
# Search engine
# ===============
@staticmethod
def search_parse(query: str, case_sensitive: bool) -> Dict[str, List[str]]:
''' Build a search object from a string '''
included = []
excluded = []
terms = PwicConst.REGEXES['search_terms'].findall(query.replace('\r', '').strip())
for negative, term in terms: