Robots/bkmk_robot_base.py

   1 """Base class for robots
   2
   3 This file is a part of Bookmarks database and Internet robot.
   4
   5 """
   6
   7 __author__ = "Oleg Broytman <phd@phdru.name>"
   8 __copyright__ = "Copyright (C) 2000-2023 PhiloSoft Design"
   9 __license__ = "GNU GPL"
  10
  11 __all__ = ['robot_base', 'get_error']
  12
  13
  14 from base64 import b64encode
  15 import sys
  16 import socket
  17 import time
  18 try:
  19     from urllib.parse import splittype, splithost, splittag, urljoin
  20 except ImportError:
  21     from urllib import splittype, splithost, splittag
  22     from urlparse import urljoin
  23
  24 from m_lib.md5wrapper import md5wrapper
  25 from m_lib.net.www.util import parse_time
  26
  27 from bkmk_objects import Robot
  28 from parse_html import parse_html
  29
  30
  31 reloc_dict = {
  32   301: "perm1.",
  33   302: "temp2.",
  34   303: "temp3.",
  35   307: "temp7.",
  36   308: "temp8.",
  37   "html": "html"
  38 }
  39
  40
  41 def get_error(e):
  42     if isinstance(e, str):
  43         return e
  44
  45     else:
  46         s = []
  47         for i in e:
  48             s.append("'%s'" % str(i).replace('\n', "\\n"))
  49         return "(%s)" % ' '.join(s)
  50
  51
  52 # Icon cache; maps URL to a tuple (content type, data)
  53 # or None if there is no icon.
  54 icons = {}
  55
  56
  57 class robot_base(Robot):
  58     timeout = 60
  59
  60     def __init__(self, *args, **kw):
  61         Robot.__init__(self, *args, **kw)
  62         socket.setdefaulttimeout(int(self.timeout))
  63
  64     def check_url(self, bookmark):
  65         try:
  66             self.start = int(time.time())
  67             bookmark.icon = None
  68
  69             url_type, url_rest = splittype(bookmark.href)
  70             url_host, url_path = splithost(url_rest)
  71             url_path, url_tag  = splittag(url_path)  # noqa: E221
  72             #                    multiple spaces before operator
  73
  74             url = "%s://%s%s" % (url_type, url_host, url_path)
  75             error, redirect_code, redirect_to, headers, content = \
  76                 self.get(bookmark, url, True)
  77
  78             if error:
  79                 bookmark.error = error
  80                 return 1
  81
  82             if redirect_code:
  83                 self.set_redirect(bookmark, redirect_code, redirect_to)
  84                 return 1
  85
  86             size = 0
  87             last_modified = None
  88
  89             if headers:
  90                 try:
  91                     size = headers["Content-Length"]
  92                 except KeyError:
  93                     size = len(content)
  94
  95                 try:
  96                     last_modified = headers["Last-Modified"]
  97                 except KeyError:
  98                     pass
  99
 100                 if last_modified:
 101                     last_modified = parse_time(last_modified)
 102             else:
 103                 size = len(content)
 104
 105             if last_modified:
 106                 last_modified = str(int(last_modified))
 107             else:
 108                 last_modified = bookmark.last_visit
 109
 110             bookmark.size = size
 111             bookmark.last_modified = last_modified
 112
 113             md5 = md5wrapper()
 114             if url_type == "ftp":  # Pass welcome message through MD5
 115                 ftp_welcome = self.get_ftp_welcome()
 116                 if not isinstance(ftp_welcome, bytes):
 117                     ftp_welcome = ftp_welcome.encode('utf-8')
 118                 md5.update(ftp_welcome)
 119
 120             if isinstance(content, bytes):
 121                 md5.update(content)
 122             else:
 123                 md5.update(content.encode('utf-8'))
 124             bookmark.md5 = str(md5)
 125
 126             if headers:
 127                 try:
 128                     content_type = headers["Content-Type"]
 129                     self.log("   Content-Type   : %s" % content_type)
 130                     if content_type is None:
 131                         if 'html' in content.lower():
 132                             content_type = 'text/html'
 133                         else:
 134                             content_type = 'text/plain'
 135                         self.log("   Set Content-Type to: %s"
 136                                  % content_type)
 137                     try:
 138                         # extract charset from
 139                         # "text/html; foo; charset=UTF-8, bar; baz;"
 140                         content_type, charset = content_type.split(';', 1)
 141                         content_type = content_type.strip()
 142                         charset = charset.split('=')[1].strip().split(',')[0]
 143                         self.log("   HTTP charset   : %s" % charset)
 144                     except (ValueError, IndexError):
 145                         charset = None
 146                         self.log("   no charset in Content-Type header")
 147                     is_html = False
 148                     for ctype in ("text/html", "application/xhtml+xml"):
 149                         if content_type.startswith(ctype):
 150                             is_html = True
 151                             break
 152                     content_stripped = content.strip()
 153                     if content_stripped and is_html:
 154                         parser = parse_html(content_stripped, charset, self.log)
 155                         if charset:
 156                             bookmark.charset = charset
 157                         elif parser and parser.meta_charset:
 158                             bookmark.charset = parser.meta_charset
 159                         if parser:
 160                             bookmark.real_title = parser.title
 161                             icon = parser.icon
 162                         else:
 163                             icon = None
 164                         if not icon:
 165                             icon = "/favicon.ico"
 166                         icon_url = urljoin(
 167                             "%s://%s%s" % (url_type, url_host, url_path), icon)
 168                         self.log("   looking for icon at: %s" % icon_url)
 169                         if icon_url in icons:
 170                             if icons[icon_url]:
 171                                 bookmark.icon_href = icon_url
 172                                 content_type, bookmark.icon = icons[icon_url]
 173                                 self.log("   cached icon: %s" % content_type)
 174                             else:
 175                                 self.log("   cached icon: no icon")
 176                         else:
 177                             try:
 178                                 _icon_url = icon_url
 179                                 for i in range(8):
 180                                     error, icon_redirect_code, \
 181                                         icon_redirect_to, icon_headers, \
 182                                         icon_data = \
 183                                         self.get(bookmark, _icon_url)
 184                                     if icon_redirect_code:
 185                                         _icon_url = icon_redirect_to
 186                                         self.log("   redirect to : %s"
 187                                                  % _icon_url)
 188                                     else:
 189                                         if icon_data is None:
 190                                             raise IOError("No icon")
 191                                         break
 192                                 else:
 193                                     raise IOError("Too many redirects")
 194                             except:
 195                                 etype, emsg, _ = sys.exc_info()
 196                                 self.log("   no icon        : %s %s"
 197                                          % (etype, emsg))
 198                                 etype = emsg = _ = None
 199                                 icons[icon_url] = None
 200                             else:
 201                                 content_type = icon_headers["Content-Type"]
 202                                 if content_type and (
 203                                     content_type.startswith("application/")
 204                                     or content_type.startswith("image/")
 205                                     or content_type.startswith("text/plain")
 206                                 ):
 207                                     bookmark.icon_href = icon_url
 208                                     self.log("   got icon       : %s"
 209                                              % content_type)
 210                                     if (
 211                                         content_type.startswith("application/")
 212                                         or content_type.startswith(
 213                                             "text/plain")
 214                                     ):
 215                                         self.log("   non-image content type,"
 216                                                  " assume x-icon")
 217                                         content_type = 'image/x-icon'
 218                                     if not isinstance(icon_data, bytes):
 219                                         icon_data = icon_data.encode('utf-8')
 220                                     bookmark.icon = "data:%s;base64,%s" \
 221                                         % (content_type, b64encode(icon_data))
 222                                     icons[icon_url] = (content_type,
 223                                                        bookmark.icon
 224                                                        )
 225                                 else:
 226                                     self.log("   no icon        :"
 227                                              "bad content type '%s'"
 228                                              % content_type
 229                                              )
 230                                     icons[icon_url] = None
 231                         if parser and parser.refresh:
 232                             refresh = parser.refresh
 233                             try:
 234                                 url = refresh.split('=', 1)[1]
 235                             except IndexError:
 236                                 url = "self"
 237                             try:
 238                                 timeout = float(refresh.split(';')[0])
 239                             except (IndexError, ValueError):
 240                                 self.set_redirect(bookmark, "html",
 241                                                   "Bad redirect to %s (%s)"
 242                                                   % (url, refresh)
 243                                                   )
 244                             else:
 245                                 try:
 246                                     timeout = int(refresh.split(';')[0])
 247                                 except ValueError:
 248                                     pass  # float timeout
 249                                 self.set_redirect(bookmark, "html",
 250                                                   "%s (%s sec)"
 251                                                   % (url, timeout)
 252                                                   )
 253
 254                     if not content_stripped:
 255                         self.log("   empty response, no content")
 256                     if not is_html:
 257                         self.log("   not html")
 258                 except KeyError as key:
 259                     self.log("   no header: %s" % key)
 260
 261         except EOFError:
 262             bookmark.error = "Unexpected EOF (FTP server closed connection)"
 263             self.log('   EOF: %s' % bookmark.error)
 264
 265         except KeyboardInterrupt:
 266             self.log("Keyboard interrupt (^C)")
 267             return 0
 268
 269         except socket.error as e:
 270             bookmark.error = get_error(e)
 271             self.log(bookmark.error)
 272
 273         except:
 274             import traceback
 275             traceback.print_exc()
 276             bookmark.error = "Exception!"
 277             self.log('   Exception: %s' % bookmark.error)
 278
 279         finally:
 280             self.finish_check_url(bookmark)
 281
 282         # Tested
 283         return 1
 284
 285     def set_redirect(self, bookmark, errcode, newurl):
 286         bookmark.moved = moved = "(%s) to %s" % (reloc_dict[errcode], newurl)
 287         try:
 288             moved.encode('ascii')
 289         except UnicodeEncodeError:
 290             try:
 291                 moved = moved.encode(bookmark.charset)
 292             except (LookupError, TypeError, UnicodeEncodeError):
 293                 moved = moved.encode('utf-8')
 294         self.log('   Moved: %s' % moved)
 295
 296     def finish_check_url(self, bookmark):
 297         start = self.start
 298         bookmark.last_tested = str(start)
 299         now = int(time.time())
 300         bookmark.test_time = str(now - start)