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File Name : robotparser.py

""" robotparser.py

You can choose between two licenses when using this package:
    1) GNU GPLv2
    2) PSF license for Python 2.2

The robots.txt Exclusion Protocol is implemented as specified in
    http://info.webcrawler.com/mak/projects/robots/norobots-rfc.html
"""

import urllib.parse, urllib.request

__all__ = ["RobotFileParser"]

class RobotFileParser:
    """ This class provides a set of methods to read, parse and answer
    questions about a single robots.txt file.

"""

def __init__(self, url=''):
        self.entries = []
        self.default_entry = None
        self.disallow_all = False
        self.allow_all = False
        self.set_url(url)
        self.last_checked = 0

def mtime(self):
        """Returns the time the robots.txt file was last fetched.

This is useful for long-running web spiders that need to
        check for new robots.txt files periodically.

"""
        return self.last_checked

def modified(self):
        """Sets the time the robots.txt file was last fetched to the
        current time.

"""
        import time
        self.last_checked = time.time()

def set_url(self, url):
        """Sets the URL referring to a robots.txt file."""
        self.url = url
        self.host, self.path = urllib.parse.urlparse(url)[1:3]

def read(self):
        """Reads the robots.txt URL and feeds it to the parser."""
        try:
            f = urllib.request.urlopen(self.url)
        except urllib.error.HTTPError as err:
            if err.code in (401, 403):
                self.disallow_all = True
            elif err.code >= 400:
                self.allow_all = True
        else:
            raw = f.read()
            self.parse(raw.decode("utf-8").splitlines())

def _add_entry(self, entry):
        if "*" in entry.useragents:
            # the default entry is considered last
            if self.default_entry is None:
                # the first default entry wins
                self.default_entry = entry
        else:
            self.entries.append(entry)

def parse(self, lines):
        """Parse the input lines from a robots.txt file.

We allow that a user-agent: line is not preceded by
        one or more blank lines.
        """
        # states:
        #   0: start state
        #   1: saw user-agent line
        #   2: saw an allow or disallow line
        state = 0
        entry = Entry()

for line in lines:
            if not line:
                if state == 1:
                    entry = Entry()
                    state = 0
                elif state == 2:
                    self._add_entry(entry)
                    entry = Entry()
                    state = 0
            # remove optional comment and strip line
            i = line.find('#')
            if i >= 0:
                line = line[:i]
            line = line.strip()
            if not line:
                continue
            line = line.split(':', 1)
            if len(line) == 2:
                line[0] = line[0].strip().lower()
                line[1] = urllib.parse.unquote(line[1].strip())
                if line[0] == "user-agent":
                    if state == 2:
                        self._add_entry(entry)
                        entry = Entry()
                    entry.useragents.append(line[1])
                    state = 1
                elif line[0] == "disallow":
                    if state != 0:
                        entry.rulelines.append(RuleLine(line[1], False))
                        state = 2
                elif line[0] == "allow":
                    if state != 0:
                        entry.rulelines.append(RuleLine(line[1], True))
                        state = 2
        if state == 2:
            self._add_entry(entry)

def can_fetch(self, useragent, url):
        """using the parsed robots.txt decide if useragent can fetch url"""
        if self.disallow_all:
            return False
        if self.allow_all:
            return True
        # search for given user agent matches
        # the first match counts
        parsed_url = urllib.parse.urlparse(urllib.parse.unquote(url))
        url = urllib.parse.urlunparse(('','',parsed_url.path,
            parsed_url.params,parsed_url.query, parsed_url.fragment))
        url = urllib.parse.quote(url)
        if not url:
            url = "/"
        for entry in self.entries:
            if entry.applies_to(useragent):
                return entry.allowance(url)
        # try the default entry last
        if self.default_entry:
            return self.default_entry.allowance(url)
        # agent not found ==> access granted
        return True

def __str__(self):
        return ''.join([str(entry) + "\n" for entry in self.entries])

class RuleLine:
    """A rule line is a single "Allow:" (allowance==True) or "Disallow:"
       (allowance==False) followed by a path."""
    def __init__(self, path, allowance):
        if path == '' and not allowance:
            # an empty value means allow all
            allowance = True
        path = urllib.parse.urlunparse(urllib.parse.urlparse(path))
        self.path = urllib.parse.quote(path)
        self.allowance = allowance

def applies_to(self, filename):
        return self.path == "*" or filename.startswith(self.path)

def __str__(self):
        return (self.allowance and "Allow" or "Disallow") + ": " + self.path

class Entry:
    """An entry has one or more user-agents and zero or more rulelines"""
    def __init__(self):
        self.useragents = []
        self.rulelines = []

def __str__(self):
        ret = []
        for agent in self.useragents:
            ret.extend(["User-agent: ", agent, "\n"])
        for line in self.rulelines:
            ret.extend([str(line), "\n"])
        return ''.join(ret)

def applies_to(self, useragent):
        """check if this entry applies to the specified agent"""
        # split the name token and make it lower case
        useragent = useragent.split("/")[0].lower()
        for agent in self.useragents:
            if agent == '*':
                # we have the catch-all agent
                return True
            agent = agent.lower()
            if agent in useragent:
                return True
        return False

def allowance(self, filename):
        """Preconditions:
        - our agent applies to this entry
        - filename is URL decoded"""
        for line in self.rulelines:
            if line.applies_to(filename):
                return line.allowance
        return True

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2024-10-05 01:41:04
..	dir	-	root/linksafe	0755	2024-10-05 01:41:04
__pycache__	dir	-	root/linksafe	0755	2024-10-05 01:41:04
__init__.py	application/x-empty	0 B	root/linksafe	0644	2024-04-17 04:58:16
error.py	text/plain	2.51 KB	root/linksafe	0644	2024-04-17 04:58:16
parse.py	text/plain	34.33 KB	root/linksafe	0644	2024-04-17 04:58:16
request.py	text/plain	92.49 KB	root/linksafe	0644	2024-04-17 04:58:16
response.py	text/plain	2.95 KB	root/linksafe	0644	2024-04-17 04:58:16
robotparser.py	text/plain	6.49 KB	root/linksafe	0644	2024-04-17 04:58:16

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