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825 lines
27 KiB
Python
Executable File
825 lines
27 KiB
Python
Executable File
#! /usr/bin/env python
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# Original code by Guido van Rossum; extensive changes by Sam Bayer,
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# including code to check URL fragments.
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"""Web tree checker.
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This utility is handy to check a subweb of the world-wide web for
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errors. A subweb is specified by giving one or more ``root URLs''; a
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page belongs to the subweb if one of the root URLs is an initial
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prefix of it.
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File URL extension:
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In order to easy the checking of subwebs via the local file system,
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the interpretation of ``file:'' URLs is extended to mimic the behavior
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of your average HTTP daemon: if a directory pathname is given, the
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file index.html in that directory is returned if it exists, otherwise
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a directory listing is returned. Now, you can point webchecker to the
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document tree in the local file system of your HTTP daemon, and have
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most of it checked. In fact the default works this way if your local
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web tree is located at /usr/local/etc/httpd/htdpcs (the default for
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the NCSA HTTP daemon and probably others).
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Report printed:
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When done, it reports pages with bad links within the subweb. When
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interrupted, it reports for the pages that it has checked already.
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In verbose mode, additional messages are printed during the
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information gathering phase. By default, it prints a summary of its
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work status every 50 URLs (adjustable with the -r option), and it
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reports errors as they are encountered. Use the -q option to disable
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this output.
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Checkpoint feature:
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Whether interrupted or not, it dumps its state (a Python pickle) to a
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checkpoint file and the -R option allows it to restart from the
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checkpoint (assuming that the pages on the subweb that were already
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processed haven't changed). Even when it has run till completion, -R
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can still be useful -- it will print the reports again, and -Rq prints
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the errors only. In this case, the checkpoint file is not written
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again. The checkpoint file can be set with the -d option.
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The checkpoint file is written as a Python pickle. Remember that
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Python's pickle module is currently quite slow. Give it the time it
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needs to load and save the checkpoint file. When interrupted while
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writing the checkpoint file, the old checkpoint file is not
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overwritten, but all work done in the current run is lost.
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Miscellaneous:
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- You may find the (Tk-based) GUI version easier to use. See wcgui.py.
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- Webchecker honors the "robots.txt" convention. Thanks to Skip
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Montanaro for his robotparser.py module (included in this directory)!
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The agent name is hardwired to "webchecker". URLs that are disallowed
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by the robots.txt file are reported as external URLs.
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- Because the SGML parser is a bit slow, very large SGML files are
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skipped. The size limit can be set with the -m option.
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- When the server or protocol does not tell us a file's type, we guess
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it based on the URL's suffix. The mimetypes.py module (also in this
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directory) has a built-in table mapping most currently known suffixes,
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and in addition attempts to read the mime.types configuration files in
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the default locations of Netscape and the NCSA HTTP daemon.
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- We follow links indicated by <A>, <FRAME> and <IMG> tags. We also
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honor the <BASE> tag.
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- We now check internal NAME anchor links, as well as toplevel links.
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- Checking external links is now done by default; use -x to *disable*
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this feature. External links are now checked during normal
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processing. (XXX The status of a checked link could be categorized
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better. Later...)
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- If external links are not checked, you can use the -t flag to
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provide specific overrides to -x.
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Usage: webchecker.py [option] ... [rooturl] ...
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Options:
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-R -- restart from checkpoint file
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-d file -- checkpoint filename (default %(DUMPFILE)s)
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-m bytes -- skip HTML pages larger than this size (default %(MAXPAGE)d)
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-n -- reports only, no checking (use with -R)
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-q -- quiet operation (also suppresses external links report)
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-r number -- number of links processed per round (default %(ROUNDSIZE)d)
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-t root -- specify root dir which should be treated as internal (can repeat)
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-v -- verbose operation; repeating -v will increase verbosity
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-x -- don't check external links (these are often slow to check)
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-a -- don't check name anchors
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Arguments:
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rooturl -- URL to start checking
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(default %(DEFROOT)s)
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"""
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__version__ = "$Revision$"
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import sys
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import os
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from types import *
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import string
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import StringIO
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import getopt
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import pickle
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import urllib
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import urlparse
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import sgmllib
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import mimetypes
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import robotparser
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# Extract real version number if necessary
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if __version__[0] == '$':
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_v = string.split(__version__)
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if len(_v) == 3:
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__version__ = _v[1]
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# Tunable parameters
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DEFROOT = "file:/usr/local/etc/httpd/htdocs/" # Default root URL
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CHECKEXT = 1 # Check external references (1 deep)
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VERBOSE = 1 # Verbosity level (0-3)
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MAXPAGE = 150000 # Ignore files bigger than this
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ROUNDSIZE = 50 # Number of links processed per round
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DUMPFILE = "@webchecker.pickle" # Pickled checkpoint
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AGENTNAME = "webchecker" # Agent name for robots.txt parser
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NONAMES = 0 # Force name anchor checking
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# Global variables
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def main():
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checkext = CHECKEXT
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verbose = VERBOSE
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maxpage = MAXPAGE
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roundsize = ROUNDSIZE
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dumpfile = DUMPFILE
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restart = 0
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norun = 0
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'Rd:m:nqr:t:vxa')
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except getopt.error, msg:
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sys.stdout = sys.stderr
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print msg
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print __doc__%globals()
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sys.exit(2)
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# The extra_roots variable collects extra roots.
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extra_roots = []
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nonames = NONAMES
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for o, a in opts:
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if o == '-R':
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restart = 1
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if o == '-d':
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dumpfile = a
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if o == '-m':
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maxpage = string.atoi(a)
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if o == '-n':
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norun = 1
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if o == '-q':
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verbose = 0
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if o == '-r':
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roundsize = string.atoi(a)
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if o == '-t':
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extra_roots.append(a)
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if o == '-a':
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nonames = not nonames
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if o == '-v':
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verbose = verbose + 1
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if o == '-x':
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checkext = not checkext
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if verbose > 0:
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print AGENTNAME, "version", __version__
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if restart:
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c = load_pickle(dumpfile=dumpfile, verbose=verbose)
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else:
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c = Checker()
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c.setflags(checkext=checkext, verbose=verbose,
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maxpage=maxpage, roundsize=roundsize,
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nonames=nonames
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)
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if not restart and not args:
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args.append(DEFROOT)
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for arg in args:
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c.addroot(arg)
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# The -t flag is only needed if external links are not to be
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# checked. So -t values are ignored unless -x was specified.
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if not checkext:
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for root in extra_roots:
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# Make sure it's terminated by a slash,
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# so that addroot doesn't discard the last
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# directory component.
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if root[-1] != "/":
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root = root + "/"
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c.addroot(root, add_to_do = 0)
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try:
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if not norun:
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try:
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c.run()
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except KeyboardInterrupt:
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if verbose > 0:
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print "[run interrupted]"
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try:
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c.report()
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except KeyboardInterrupt:
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if verbose > 0:
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print "[report interrupted]"
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finally:
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if c.save_pickle(dumpfile):
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if dumpfile == DUMPFILE:
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print "Use ``%s -R'' to restart." % sys.argv[0]
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else:
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print "Use ``%s -R -d %s'' to restart." % (sys.argv[0],
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dumpfile)
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def load_pickle(dumpfile=DUMPFILE, verbose=VERBOSE):
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if verbose > 0:
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print "Loading checkpoint from %s ..." % dumpfile
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f = open(dumpfile, "rb")
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c = pickle.load(f)
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f.close()
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if verbose > 0:
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print "Done."
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print "Root:", string.join(c.roots, "\n ")
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return c
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class Checker:
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checkext = CHECKEXT
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verbose = VERBOSE
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maxpage = MAXPAGE
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roundsize = ROUNDSIZE
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nonames = NONAMES
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validflags = tuple(dir())
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def __init__(self):
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self.reset()
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def setflags(self, **kw):
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for key in kw.keys():
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if key not in self.validflags:
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raise NameError, "invalid keyword argument: %s" % str(key)
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for key, value in kw.items():
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setattr(self, key, value)
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def reset(self):
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self.roots = []
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self.todo = {}
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self.done = {}
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self.bad = {}
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# Add a name table, so that the name URLs can be checked. Also
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# serves as an implicit cache for which URLs are done.
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self.name_table = {}
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self.round = 0
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# The following are not pickled:
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self.robots = {}
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self.errors = {}
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self.urlopener = MyURLopener()
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self.changed = 0
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def note(self, level, format, *args):
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if self.verbose > level:
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if args:
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format = format%args
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self.message(format)
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def message(self, format, *args):
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if args:
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format = format%args
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print format
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def __getstate__(self):
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return (self.roots, self.todo, self.done, self.bad, self.round)
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def __setstate__(self, state):
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self.reset()
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(self.roots, self.todo, self.done, self.bad, self.round) = state
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for root in self.roots:
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self.addrobot(root)
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for url in self.bad.keys():
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self.markerror(url)
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def addroot(self, root, add_to_do = 1):
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if root not in self.roots:
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troot = root
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scheme, netloc, path, params, query, fragment = \
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urlparse.urlparse(root)
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i = string.rfind(path, "/") + 1
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if 0 < i < len(path):
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path = path[:i]
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troot = urlparse.urlunparse((scheme, netloc, path,
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params, query, fragment))
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self.roots.append(troot)
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self.addrobot(root)
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if add_to_do:
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self.newlink((root, ""), ("<root>", root))
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def addrobot(self, root):
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root = urlparse.urljoin(root, "/")
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if self.robots.has_key(root): return
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url = urlparse.urljoin(root, "/robots.txt")
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self.robots[root] = rp = robotparser.RobotFileParser()
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self.note(2, "Parsing %s", url)
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rp.debug = self.verbose > 3
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rp.set_url(url)
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try:
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rp.read()
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except IOError, msg:
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self.note(1, "I/O error parsing %s: %s", url, msg)
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def run(self):
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while self.todo:
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self.round = self.round + 1
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self.note(0, "\nRound %d (%s)\n", self.round, self.status())
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urls = self.todo.keys()
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urls.sort()
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del urls[self.roundsize:]
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for url in urls:
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self.dopage(url)
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def status(self):
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return "%d total, %d to do, %d done, %d bad" % (
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len(self.todo)+len(self.done),
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len(self.todo), len(self.done),
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len(self.bad))
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def report(self):
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self.message("")
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if not self.todo: s = "Final"
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else: s = "Interim"
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self.message("%s Report (%s)", s, self.status())
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self.report_errors()
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def report_errors(self):
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if not self.bad:
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self.message("\nNo errors")
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return
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self.message("\nError Report:")
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sources = self.errors.keys()
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sources.sort()
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for source in sources:
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triples = self.errors[source]
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self.message("")
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if len(triples) > 1:
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self.message("%d Errors in %s", len(triples), source)
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else:
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self.message("Error in %s", source)
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# Call self.format_url() instead of referring
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# to the URL directly, since the URLs in these
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# triples is now a (URL, fragment) pair. The value
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# of the "source" variable comes from the list of
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# origins, and is a URL, not a pair.
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for url, rawlink, msg in triples:
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if rawlink != self.format_url(url): s = " (%s)" % rawlink
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else: s = ""
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self.message(" HREF %s%s\n msg %s",
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self.format_url(url), s, msg)
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def dopage(self, url_pair):
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# All printing of URLs uses format_url(); argument changed to
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# url_pair for clarity.
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if self.verbose > 1:
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if self.verbose > 2:
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self.show("Check ", self.format_url(url_pair),
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" from", self.todo[url_pair])
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else:
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self.message("Check %s", self.format_url(url_pair))
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url, local_fragment = url_pair
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if local_fragment and self.nonames:
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self.markdone(url_pair)
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return
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page = self.getpage(url_pair)
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if page:
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# Store the page which corresponds to this URL.
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self.name_table[url] = page
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# If there is a fragment in this url_pair, and it's not
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# in the list of names for the page, call setbad(), since
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# it's a missing anchor.
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if local_fragment and local_fragment not in page.getnames():
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self.setbad(url_pair, ("Missing name anchor `%s'" % local_fragment))
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for info in page.getlinkinfos():
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# getlinkinfos() now returns the fragment as well,
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# and we store that fragment here in the "todo" dictionary.
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link, rawlink, fragment = info
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# However, we don't want the fragment as the origin, since
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# the origin is logically a page.
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origin = url, rawlink
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self.newlink((link, fragment), origin)
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else:
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# If no page has been created yet, we want to
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# record that fact.
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self.name_table[url_pair[0]] = None
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self.markdone(url_pair)
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def newlink(self, url, origin):
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if self.done.has_key(url):
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self.newdonelink(url, origin)
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else:
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self.newtodolink(url, origin)
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def newdonelink(self, url, origin):
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if origin not in self.done[url]:
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self.done[url].append(origin)
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# Call self.format_url(), since the URL here
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# is now a (URL, fragment) pair.
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self.note(3, " Done link %s", self.format_url(url))
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# Make sure that if it's bad, that the origin gets added.
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if self.bad.has_key(url):
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source, rawlink = origin
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triple = url, rawlink, self.bad[url]
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self.seterror(source, triple)
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def newtodolink(self, url, origin):
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# Call self.format_url(), since the URL here
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# is now a (URL, fragment) pair.
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if self.todo.has_key(url):
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if origin not in self.todo[url]:
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self.todo[url].append(origin)
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self.note(3, " Seen todo link %s", self.format_url(url))
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else:
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self.todo[url] = [origin]
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self.note(3, " New todo link %s", self.format_url(url))
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def format_url(self, url):
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link, fragment = url
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if fragment: return link + "#" + fragment
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else: return link
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def markdone(self, url):
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self.done[url] = self.todo[url]
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del self.todo[url]
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self.changed = 1
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def inroots(self, url):
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for root in self.roots:
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if url[:len(root)] == root:
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return self.isallowed(root, url)
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return 0
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def isallowed(self, root, url):
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root = urlparse.urljoin(root, "/")
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return self.robots[root].can_fetch(AGENTNAME, url)
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def getpage(self, url_pair):
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# Incoming argument name is a (URL, fragment) pair.
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# The page may have been cached in the name_table variable.
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url, fragment = url_pair
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if self.name_table.has_key(url):
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return self.name_table[url]
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if url[:7] == 'mailto:' or url[:5] == 'news:':
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self.note(1, " Not checking mailto/news URL")
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return None
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isint = self.inroots(url)
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# Ensure that openpage gets the URL pair to
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# print out its error message and record the error pair
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# correctly.
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if not isint:
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if not self.checkext:
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self.note(1, " Not checking ext link")
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return None
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f = self.openpage(url_pair)
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if f:
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self.safeclose(f)
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return None
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text, nurl = self.readhtml(url_pair)
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if nurl != url:
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self.note(1, " Redirected to %s", nurl)
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url = nurl
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if text:
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return Page(text, url, maxpage=self.maxpage, checker=self)
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# These next three functions take (URL, fragment) pairs as
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# arguments, so that openpage() receives the appropriate tuple to
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# record error messages.
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def readhtml(self, url_pair):
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url, fragment = url_pair
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text = None
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f, url = self.openhtml(url_pair)
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if f:
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text = f.read()
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f.close()
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return text, url
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def openhtml(self, url_pair):
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url, fragment = url_pair
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f = self.openpage(url_pair)
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if f:
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url = f.geturl()
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info = f.info()
|
|
if not self.checkforhtml(info, url):
|
|
self.safeclose(f)
|
|
f = None
|
|
return f, url
|
|
|
|
def openpage(self, url_pair):
|
|
url, fragment = url_pair
|
|
try:
|
|
return self.urlopener.open(url)
|
|
except IOError, msg:
|
|
msg = self.sanitize(msg)
|
|
self.note(0, "Error %s", msg)
|
|
if self.verbose > 0:
|
|
self.show(" HREF ", url, " from", self.todo[url_pair])
|
|
self.setbad(url_pair, msg)
|
|
return None
|
|
|
|
def checkforhtml(self, info, url):
|
|
if info.has_key('content-type'):
|
|
ctype = string.lower(info['content-type'])
|
|
else:
|
|
if url[-1:] == "/":
|
|
return 1
|
|
ctype, encoding = mimetypes.guess_type(url)
|
|
if ctype == 'text/html':
|
|
return 1
|
|
else:
|
|
self.note(1, " Not HTML, mime type %s", ctype)
|
|
return 0
|
|
|
|
def setgood(self, url):
|
|
if self.bad.has_key(url):
|
|
del self.bad[url]
|
|
self.changed = 1
|
|
self.note(0, "(Clear previously seen error)")
|
|
|
|
def setbad(self, url, msg):
|
|
if self.bad.has_key(url) and self.bad[url] == msg:
|
|
self.note(0, "(Seen this error before)")
|
|
return
|
|
self.bad[url] = msg
|
|
self.changed = 1
|
|
self.markerror(url)
|
|
|
|
def markerror(self, url):
|
|
try:
|
|
origins = self.todo[url]
|
|
except KeyError:
|
|
origins = self.done[url]
|
|
for source, rawlink in origins:
|
|
triple = url, rawlink, self.bad[url]
|
|
self.seterror(source, triple)
|
|
|
|
def seterror(self, url, triple):
|
|
try:
|
|
# Because of the way the URLs are now processed, I need to
|
|
# check to make sure the URL hasn't been entered in the
|
|
# error list. The first element of the triple here is a
|
|
# (URL, fragment) pair, but the URL key is not, since it's
|
|
# from the list of origins.
|
|
if triple not in self.errors[url]:
|
|
self.errors[url].append(triple)
|
|
except KeyError:
|
|
self.errors[url] = [triple]
|
|
|
|
# The following used to be toplevel functions; they have been
|
|
# changed into methods so they can be overridden in subclasses.
|
|
|
|
def show(self, p1, link, p2, origins):
|
|
self.message("%s %s", p1, link)
|
|
i = 0
|
|
for source, rawlink in origins:
|
|
i = i+1
|
|
if i == 2:
|
|
p2 = ' '*len(p2)
|
|
if rawlink != link: s = " (%s)" % rawlink
|
|
else: s = ""
|
|
self.message("%s %s%s", p2, source, s)
|
|
|
|
def sanitize(self, msg):
|
|
if isinstance(IOError, ClassType) and isinstance(msg, IOError):
|
|
# Do the other branch recursively
|
|
msg.args = self.sanitize(msg.args)
|
|
elif isinstance(msg, TupleType):
|
|
if len(msg) >= 4 and msg[0] == 'http error' and \
|
|
isinstance(msg[3], InstanceType):
|
|
# Remove the Message instance -- it may contain
|
|
# a file object which prevents pickling.
|
|
msg = msg[:3] + msg[4:]
|
|
return msg
|
|
|
|
def safeclose(self, f):
|
|
try:
|
|
url = f.geturl()
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
if url[:4] == 'ftp:' or url[:7] == 'file://':
|
|
# Apparently ftp connections don't like to be closed
|
|
# prematurely...
|
|
text = f.read()
|
|
f.close()
|
|
|
|
def save_pickle(self, dumpfile=DUMPFILE):
|
|
if not self.changed:
|
|
self.note(0, "\nNo need to save checkpoint")
|
|
elif not dumpfile:
|
|
self.note(0, "No dumpfile, won't save checkpoint")
|
|
else:
|
|
self.note(0, "\nSaving checkpoint to %s ...", dumpfile)
|
|
newfile = dumpfile + ".new"
|
|
f = open(newfile, "wb")
|
|
pickle.dump(self, f)
|
|
f.close()
|
|
try:
|
|
os.unlink(dumpfile)
|
|
except os.error:
|
|
pass
|
|
os.rename(newfile, dumpfile)
|
|
self.note(0, "Done.")
|
|
return 1
|
|
|
|
|
|
class Page:
|
|
|
|
def __init__(self, text, url, verbose=VERBOSE, maxpage=MAXPAGE, checker=None):
|
|
self.text = text
|
|
self.url = url
|
|
self.verbose = verbose
|
|
self.maxpage = maxpage
|
|
self.checker = checker
|
|
|
|
# The parsing of the page is done in the __init__() routine in
|
|
# order to initialize the list of names the file
|
|
# contains. Stored the parser in an instance variable. Passed
|
|
# the URL to MyHTMLParser().
|
|
size = len(self.text)
|
|
if size > self.maxpage:
|
|
self.note(0, "Skip huge file %s (%.0f Kbytes)", self.url, (size*0.001))
|
|
self.parser = None
|
|
return
|
|
self.checker.note(2, " Parsing %s (%d bytes)", self.url, size)
|
|
self.parser = MyHTMLParser(url, verbose=self.verbose,
|
|
checker=self.checker)
|
|
self.parser.feed(self.text)
|
|
self.parser.close()
|
|
|
|
def note(self, level, msg, *args):
|
|
if self.checker:
|
|
apply(self.checker.note, (level, msg) + args)
|
|
else:
|
|
if self.verbose >= level:
|
|
if args:
|
|
msg = msg%args
|
|
print msg
|
|
|
|
# Method to retrieve names.
|
|
def getnames(self):
|
|
if self.parser:
|
|
return self.parser.names
|
|
else:
|
|
return []
|
|
|
|
def getlinkinfos(self):
|
|
# File reading is done in __init__() routine. Store parser in
|
|
# local variable to indicate success of parsing.
|
|
|
|
# If no parser was stored, fail.
|
|
if not self.parser: return []
|
|
|
|
rawlinks = self.parser.getlinks()
|
|
base = urlparse.urljoin(self.url, self.parser.getbase() or "")
|
|
infos = []
|
|
for rawlink in rawlinks:
|
|
t = urlparse.urlparse(rawlink)
|
|
# DON'T DISCARD THE FRAGMENT! Instead, include
|
|
# it in the tuples which are returned. See Checker.dopage().
|
|
fragment = t[-1]
|
|
t = t[:-1] + ('',)
|
|
rawlink = urlparse.urlunparse(t)
|
|
link = urlparse.urljoin(base, rawlink)
|
|
infos.append((link, rawlink, fragment))
|
|
|
|
return infos
|
|
|
|
|
|
class MyStringIO(StringIO.StringIO):
|
|
|
|
def __init__(self, url, info):
|
|
self.__url = url
|
|
self.__info = info
|
|
StringIO.StringIO.__init__(self)
|
|
|
|
def info(self):
|
|
return self.__info
|
|
|
|
def geturl(self):
|
|
return self.__url
|
|
|
|
|
|
class MyURLopener(urllib.FancyURLopener):
|
|
|
|
http_error_default = urllib.URLopener.http_error_default
|
|
|
|
def __init__(*args):
|
|
self = args[0]
|
|
apply(urllib.FancyURLopener.__init__, args)
|
|
self.addheaders = [
|
|
('User-agent', 'Python-webchecker/%s' % __version__),
|
|
]
|
|
|
|
def http_error_401(self, url, fp, errcode, errmsg, headers):
|
|
return None
|
|
|
|
def open_file(self, url):
|
|
path = urllib.url2pathname(urllib.unquote(url))
|
|
if os.path.isdir(path):
|
|
if path[-1] != os.sep:
|
|
url = url + '/'
|
|
indexpath = os.path.join(path, "index.html")
|
|
if os.path.exists(indexpath):
|
|
return self.open_file(url + "index.html")
|
|
try:
|
|
names = os.listdir(path)
|
|
except os.error, msg:
|
|
raise IOError, msg, sys.exc_traceback
|
|
names.sort()
|
|
s = MyStringIO("file:"+url, {'content-type': 'text/html'})
|
|
s.write('<BASE HREF="file:%s">\n' %
|
|
urllib.quote(os.path.join(path, "")))
|
|
for name in names:
|
|
q = urllib.quote(name)
|
|
s.write('<A HREF="%s">%s</A>\n' % (q, q))
|
|
s.seek(0)
|
|
return s
|
|
return urllib.FancyURLopener.open_file(self, url)
|
|
|
|
|
|
class MyHTMLParser(sgmllib.SGMLParser):
|
|
|
|
def __init__(self, url, verbose=VERBOSE, checker=None):
|
|
self.myverbose = verbose # now unused
|
|
self.checker = checker
|
|
self.base = None
|
|
self.links = {}
|
|
self.names = []
|
|
self.url = url
|
|
sgmllib.SGMLParser.__init__(self)
|
|
|
|
def start_a(self, attributes):
|
|
self.link_attr(attributes, 'href')
|
|
|
|
# We must rescue the NAME
|
|
# attributes from the anchor, in order to
|
|
# cache the internal anchors which are made
|
|
# available in the page.
|
|
for name, value in attributes:
|
|
if name == "name":
|
|
if value in self.names:
|
|
self.checker.message("WARNING: duplicate name %s in %s",
|
|
value, self.url)
|
|
else: self.names.append(value)
|
|
break
|
|
|
|
def end_a(self): pass
|
|
|
|
def do_area(self, attributes):
|
|
self.link_attr(attributes, 'href')
|
|
|
|
def do_img(self, attributes):
|
|
self.link_attr(attributes, 'src', 'lowsrc')
|
|
|
|
def do_frame(self, attributes):
|
|
self.link_attr(attributes, 'src')
|
|
|
|
def link_attr(self, attributes, *args):
|
|
for name, value in attributes:
|
|
if name in args:
|
|
if value: value = string.strip(value)
|
|
if value: self.links[value] = None
|
|
|
|
def do_base(self, attributes):
|
|
for name, value in attributes:
|
|
if name == 'href':
|
|
if value: value = string.strip(value)
|
|
if value:
|
|
if self.checker:
|
|
self.checker.note(1, " Base %s", value)
|
|
self.base = value
|
|
|
|
def getlinks(self):
|
|
return self.links.keys()
|
|
|
|
def getbase(self):
|
|
return self.base
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|