EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.2 / Lib / nntplib.py

"""An NNTP client class based on RFC 977: Network News Transfer Protocol.\r
\r
Example:\r
\r
>>> from nntplib import NNTP\r
>>> s = NNTP('news')\r
>>> resp, count, first, last, name = s.group('comp.lang.python')\r
>>> print 'Group', name, 'has', count, 'articles, range', first, 'to', last\r
Group comp.lang.python has 51 articles, range 5770 to 5821\r
>>> resp, subs = s.xhdr('subject', first + '-' + last)\r
>>> resp = s.quit()\r
>>>\r
\r
Here 'resp' is the server response line.\r
Error responses are turned into exceptions.\r
\r
To post an article from a file:\r
>>> f = open(filename, 'r') # file containing article, including header\r
>>> resp = s.post(f)\r
>>>\r
\r
For descriptions of all methods, read the comments in the code below.\r
Note that all arguments and return values representing article numbers\r
are strings, not numbers, since they are rarely used for calculations.\r
"""\r
\r
# RFC 977 by Brian Kantor and Phil Lapsley.\r
# xover, xgtitle, xpath, date methods by Kevan Heydon\r
\r
\r
# Imports\r
import re\r
import socket\r
\r
__all__ = ["NNTP","NNTPReplyError","NNTPTemporaryError",\r
           "NNTPPermanentError","NNTPProtocolError","NNTPDataError",\r
           "error_reply","error_temp","error_perm","error_proto",\r
           "error_data",]\r
\r
# Exceptions raised when an error or invalid response is received\r
class NNTPError(Exception):\r
    """Base class for all nntplib exceptions"""\r
    def __init__(self, *args):\r
        Exception.__init__(self, *args)\r
        try:\r
            self.response = args[0]\r
        except IndexError:\r
            self.response = 'No response given'\r
\r
class NNTPReplyError(NNTPError):\r
    """Unexpected [123]xx reply"""\r
    pass\r
\r
class NNTPTemporaryError(NNTPError):\r
    """4xx errors"""\r
    pass\r
\r
class NNTPPermanentError(NNTPError):\r
    """5xx errors"""\r
    pass\r
\r
class NNTPProtocolError(NNTPError):\r
    """Response does not begin with [1-5]"""\r
    pass\r
\r
class NNTPDataError(NNTPError):\r
    """Error in response data"""\r
    pass\r
\r
# for backwards compatibility\r
error_reply = NNTPReplyError\r
error_temp = NNTPTemporaryError\r
error_perm = NNTPPermanentError\r
error_proto = NNTPProtocolError\r
error_data = NNTPDataError\r
\r
\r
\r
# Standard port used by NNTP servers\r
NNTP_PORT = 119\r
\r
\r
# Response numbers that are followed by additional text (e.g. article)\r
LONGRESP = ['100', '215', '220', '221', '222', '224', '230', '231', '282']\r
\r
\r
# Line terminators (we always output CRLF, but accept any of CRLF, CR, LF)\r
CRLF = '\r\n'\r
\r
\r
\r
# The class itself\r
class NNTP:\r
    def __init__(self, host, port=NNTP_PORT, user=None, password=None,\r
                 readermode=None, usenetrc=True):\r
        """Initialize an instance.  Arguments:\r
        - host: hostname to connect to\r
        - port: port to connect to (default the standard NNTP port)\r
        - user: username to authenticate with\r
        - password: password to use with username\r
        - readermode: if true, send 'mode reader' command after\r
                      connecting.\r
\r
        readermode is sometimes necessary if you are connecting to an\r
        NNTP server on the local machine and intend to call\r
        reader-specific commands, such as `group'.  If you get\r
        unexpected NNTPPermanentErrors, you might need to set\r
        readermode.\r
        """\r
        self.host = host\r
        self.port = port\r
        self.sock = socket.create_connection((host, port))\r
        self.file = self.sock.makefile('rb')\r
        self.debugging = 0\r
        self.welcome = self.getresp()\r
\r
        # 'mode reader' is sometimes necessary to enable 'reader' mode.\r
        # However, the order in which 'mode reader' and 'authinfo' need to\r
        # arrive differs between some NNTP servers. Try to send\r
        # 'mode reader', and if it fails with an authorization failed\r
        # error, try again after sending authinfo.\r
        readermode_afterauth = 0\r
        if readermode:\r
            try:\r
                self.welcome = self.shortcmd('mode reader')\r
            except NNTPPermanentError:\r
                # error 500, probably 'not implemented'\r
                pass\r
            except NNTPTemporaryError, e:\r
                if user and e.response[:3] == '480':\r
                    # Need authorization before 'mode reader'\r
                    readermode_afterauth = 1\r
                else:\r
                    raise\r
        # If no login/password was specified, try to get them from ~/.netrc\r
        # Presume that if .netc has an entry, NNRP authentication is required.\r
        try:\r
            if usenetrc and not user:\r
                import netrc\r
                credentials = netrc.netrc()\r
                auth = credentials.authenticators(host)\r
                if auth:\r
                    user = auth[0]\r
                    password = auth[2]\r
        except IOError:\r
            pass\r
        # Perform NNRP authentication if needed.\r
        if user:\r
            resp = self.shortcmd('authinfo user '+user)\r
            if resp[:3] == '381':\r
                if not password:\r
                    raise NNTPReplyError(resp)\r
                else:\r
                    resp = self.shortcmd(\r
                            'authinfo pass '+password)\r
                    if resp[:3] != '281':\r
                        raise NNTPPermanentError(resp)\r
            if readermode_afterauth:\r
                try:\r
                    self.welcome = self.shortcmd('mode reader')\r
                except NNTPPermanentError:\r
                    # error 500, probably 'not implemented'\r
                    pass\r
\r
\r
    # Get the welcome message from the server\r
    # (this is read and squirreled away by __init__()).\r
    # If the response code is 200, posting is allowed;\r
    # if it 201, posting is not allowed\r
\r
    def getwelcome(self):\r
        """Get the welcome message from the server\r
        (this is read and squirreled away by __init__()).\r
        If the response code is 200, posting is allowed;\r
        if it 201, posting is not allowed."""\r
\r
        if self.debugging: print '*welcome*', repr(self.welcome)\r
        return self.welcome\r
\r
    def set_debuglevel(self, level):\r
        """Set the debugging level.  Argument 'level' means:\r
        0: no debugging output (default)\r
        1: print commands and responses but not body text etc.\r
        2: also print raw lines read and sent before stripping CR/LF"""\r
\r
        self.debugging = level\r
    debug = set_debuglevel\r
\r
    def putline(self, line):\r
        """Internal: send one line to the server, appending CRLF."""\r
        line = line + CRLF\r
        if self.debugging > 1: print '*put*', repr(line)\r
        self.sock.sendall(line)\r
\r
    def putcmd(self, line):\r
        """Internal: send one command to the server (through putline())."""\r
        if self.debugging: print '*cmd*', repr(line)\r
        self.putline(line)\r
\r
    def getline(self):\r
        """Internal: return one line from the server, stripping CRLF.\r
        Raise EOFError if the connection is closed."""\r
        line = self.file.readline()\r
        if self.debugging > 1:\r
            print '*get*', repr(line)\r
        if not line: raise EOFError\r
        if line[-2:] == CRLF: line = line[:-2]\r
        elif line[-1:] in CRLF: line = line[:-1]\r
        return line\r
\r
    def getresp(self):\r
        """Internal: get a response from the server.\r
        Raise various errors if the response indicates an error."""\r
        resp = self.getline()\r
        if self.debugging: print '*resp*', repr(resp)\r
        c = resp[:1]\r
        if c == '4':\r
            raise NNTPTemporaryError(resp)\r
        if c == '5':\r
            raise NNTPPermanentError(resp)\r
        if c not in '123':\r
            raise NNTPProtocolError(resp)\r
        return resp\r
\r
    def getlongresp(self, file=None):\r
        """Internal: get a response plus following text from the server.\r
        Raise various errors if the response indicates an error."""\r
\r
        openedFile = None\r
        try:\r
            # If a string was passed then open a file with that name\r
            if isinstance(file, str):\r
                openedFile = file = open(file, "w")\r
\r
            resp = self.getresp()\r
            if resp[:3] not in LONGRESP:\r
                raise NNTPReplyError(resp)\r
            list = []\r
            while 1:\r
                line = self.getline()\r
                if line == '.':\r
                    break\r
                if line[:2] == '..':\r
                    line = line[1:]\r
                if file:\r
                    file.write(line + "\n")\r
                else:\r
                    list.append(line)\r
        finally:\r
            # If this method created the file, then it must close it\r
            if openedFile:\r
                openedFile.close()\r
\r
        return resp, list\r
\r
    def shortcmd(self, line):\r
        """Internal: send a command and get the response."""\r
        self.putcmd(line)\r
        return self.getresp()\r
\r
    def longcmd(self, line, file=None):\r
        """Internal: send a command and get the response plus following text."""\r
        self.putcmd(line)\r
        return self.getlongresp(file)\r
\r
    def newgroups(self, date, time, file=None):\r
        """Process a NEWGROUPS command.  Arguments:\r
        - date: string 'yymmdd' indicating the date\r
        - time: string 'hhmmss' indicating the time\r
        Return:\r
        - resp: server response if successful\r
        - list: list of newsgroup names"""\r
\r
        return self.longcmd('NEWGROUPS ' + date + ' ' + time, file)\r
\r
    def newnews(self, group, date, time, file=None):\r
        """Process a NEWNEWS command.  Arguments:\r
        - group: group name or '*'\r
        - date: string 'yymmdd' indicating the date\r
        - time: string 'hhmmss' indicating the time\r
        Return:\r
        - resp: server response if successful\r
        - list: list of message ids"""\r
\r
        cmd = 'NEWNEWS ' + group + ' ' + date + ' ' + time\r
        return self.longcmd(cmd, file)\r
\r
    def list(self, file=None):\r
        """Process a LIST command.  Return:\r
        - resp: server response if successful\r
        - list: list of (group, last, first, flag) (strings)"""\r
\r
        resp, list = self.longcmd('LIST', file)\r
        for i in range(len(list)):\r
            # Parse lines into "group last first flag"\r
            list[i] = tuple(list[i].split())\r
        return resp, list\r
\r
    def description(self, group):\r
\r
        """Get a description for a single group.  If more than one\r
        group matches ('group' is a pattern), return the first.  If no\r
        group matches, return an empty string.\r
\r
        This elides the response code from the server, since it can\r
        only be '215' or '285' (for xgtitle) anyway.  If the response\r
        code is needed, use the 'descriptions' method.\r
\r
        NOTE: This neither checks for a wildcard in 'group' nor does\r
        it check whether the group actually exists."""\r
\r
        resp, lines = self.descriptions(group)\r
        if len(lines) == 0:\r
            return ""\r
        else:\r
            return lines[0][1]\r
\r
    def descriptions(self, group_pattern):\r
        """Get descriptions for a range of groups."""\r
        line_pat = re.compile("^(?P<group>[^ \t]+)[ \t]+(.*)$")\r
        # Try the more std (acc. to RFC2980) LIST NEWSGROUPS first\r
        resp, raw_lines = self.longcmd('LIST NEWSGROUPS ' + group_pattern)\r
        if resp[:3] != "215":\r
            # Now the deprecated XGTITLE.  This either raises an error\r
            # or succeeds with the same output structure as LIST\r
            # NEWSGROUPS.\r
            resp, raw_lines = self.longcmd('XGTITLE ' + group_pattern)\r
        lines = []\r
        for raw_line in raw_lines:\r
            match = line_pat.search(raw_line.strip())\r
            if match:\r
                lines.append(match.group(1, 2))\r
        return resp, lines\r
\r
    def group(self, name):\r
        """Process a GROUP command.  Argument:\r
        - group: the group name\r
        Returns:\r
        - resp: server response if successful\r
        - count: number of articles (string)\r
        - first: first article number (string)\r
        - last: last article number (string)\r
        - name: the group name"""\r
\r
        resp = self.shortcmd('GROUP ' + name)\r
        if resp[:3] != '211':\r
            raise NNTPReplyError(resp)\r
        words = resp.split()\r
        count = first = last = 0\r
        n = len(words)\r
        if n > 1:\r
            count = words[1]\r
            if n > 2:\r
                first = words[2]\r
                if n > 3:\r
                    last = words[3]\r
                    if n > 4:\r
                        name = words[4].lower()\r
        return resp, count, first, last, name\r
\r
    def help(self, file=None):\r
        """Process a HELP command.  Returns:\r
        - resp: server response if successful\r
        - list: list of strings"""\r
\r
        return self.longcmd('HELP',file)\r
\r
    def statparse(self, resp):\r
        """Internal: parse the response of a STAT, NEXT or LAST command."""\r
        if resp[:2] != '22':\r
            raise NNTPReplyError(resp)\r
        words = resp.split()\r
        nr = 0\r
        id = ''\r
        n = len(words)\r
        if n > 1:\r
            nr = words[1]\r
            if n > 2:\r
                id = words[2]\r
        return resp, nr, id\r
\r
    def statcmd(self, line):\r
        """Internal: process a STAT, NEXT or LAST command."""\r
        resp = self.shortcmd(line)\r
        return self.statparse(resp)\r
\r
    def stat(self, id):\r
        """Process a STAT command.  Argument:\r
        - id: article number or message id\r
        Returns:\r
        - resp: server response if successful\r
        - nr:   the article number\r
        - id:   the message id"""\r
\r
        return self.statcmd('STAT ' + id)\r
\r
    def next(self):\r
        """Process a NEXT command.  No arguments.  Return as for STAT."""\r
        return self.statcmd('NEXT')\r
\r
    def last(self):\r
        """Process a LAST command.  No arguments.  Return as for STAT."""\r
        return self.statcmd('LAST')\r
\r
    def artcmd(self, line, file=None):\r
        """Internal: process a HEAD, BODY or ARTICLE command."""\r
        resp, list = self.longcmd(line, file)\r
        resp, nr, id = self.statparse(resp)\r
        return resp, nr, id, list\r
\r
    def head(self, id):\r
        """Process a HEAD command.  Argument:\r
        - id: article number or message id\r
        Returns:\r
        - resp: server response if successful\r
        - nr: article number\r
        - id: message id\r
        - list: the lines of the article's header"""\r
\r
        return self.artcmd('HEAD ' + id)\r
\r
    def body(self, id, file=None):\r
        """Process a BODY command.  Argument:\r
        - id: article number or message id\r
        - file: Filename string or file object to store the article in\r
        Returns:\r
        - resp: server response if successful\r
        - nr: article number\r
        - id: message id\r
        - list: the lines of the article's body or an empty list\r
                if file was used"""\r
\r
        return self.artcmd('BODY ' + id, file)\r
\r
    def article(self, id):\r
        """Process an ARTICLE command.  Argument:\r
        - id: article number or message id\r
        Returns:\r
        - resp: server response if successful\r
        - nr: article number\r
        - id: message id\r
        - list: the lines of the article"""\r
\r
        return self.artcmd('ARTICLE ' + id)\r
\r
    def slave(self):\r
        """Process a SLAVE command.  Returns:\r
        - resp: server response if successful"""\r
\r
        return self.shortcmd('SLAVE')\r
\r
    def xhdr(self, hdr, str, file=None):\r
        """Process an XHDR command (optional server extension).  Arguments:\r
        - hdr: the header type (e.g. 'subject')\r
        - str: an article nr, a message id, or a range nr1-nr2\r
        Returns:\r
        - resp: server response if successful\r
        - list: list of (nr, value) strings"""\r
\r
        pat = re.compile('^([0-9]+) ?(.*)\n?')\r
        resp, lines = self.longcmd('XHDR ' + hdr + ' ' + str, file)\r
        for i in range(len(lines)):\r
            line = lines[i]\r
            m = pat.match(line)\r
            if m:\r
                lines[i] = m.group(1, 2)\r
        return resp, lines\r
\r
    def xover(self, start, end, file=None):\r
        """Process an XOVER command (optional server extension) Arguments:\r
        - start: start of range\r
        - end: end of range\r
        Returns:\r
        - resp: server response if successful\r
        - list: list of (art-nr, subject, poster, date,\r
                         id, references, size, lines)"""\r
\r
        resp, lines = self.longcmd('XOVER ' + start + '-' + end, file)\r
        xover_lines = []\r
        for line in lines:\r
            elem = line.split("\t")\r
            try:\r
                xover_lines.append((elem[0],\r
                                    elem[1],\r
                                    elem[2],\r
                                    elem[3],\r
                                    elem[4],\r
                                    elem[5].split(),\r
                                    elem[6],\r
                                    elem[7]))\r
            except IndexError:\r
                raise NNTPDataError(line)\r
        return resp,xover_lines\r
\r
    def xgtitle(self, group, file=None):\r
        """Process an XGTITLE command (optional server extension) Arguments:\r
        - group: group name wildcard (i.e. news.*)\r
        Returns:\r
        - resp: server response if successful\r
        - list: list of (name,title) strings"""\r
\r
        line_pat = re.compile("^([^ \t]+)[ \t]+(.*)$")\r
        resp, raw_lines = self.longcmd('XGTITLE ' + group, file)\r
        lines = []\r
        for raw_line in raw_lines:\r
            match = line_pat.search(raw_line.strip())\r
            if match:\r
                lines.append(match.group(1, 2))\r
        return resp, lines\r
\r
    def xpath(self,id):\r
        """Process an XPATH command (optional server extension) Arguments:\r
        - id: Message id of article\r
        Returns:\r
        resp: server response if successful\r
        path: directory path to article"""\r
\r
        resp = self.shortcmd("XPATH " + id)\r
        if resp[:3] != '223':\r
            raise NNTPReplyError(resp)\r
        try:\r
            [resp_num, path] = resp.split()\r
        except ValueError:\r
            raise NNTPReplyError(resp)\r
        else:\r
            return resp, path\r
\r
    def date (self):\r
        """Process the DATE command. Arguments:\r
        None\r
        Returns:\r
        resp: server response if successful\r
        date: Date suitable for newnews/newgroups commands etc.\r
        time: Time suitable for newnews/newgroups commands etc."""\r
\r
        resp = self.shortcmd("DATE")\r
        if resp[:3] != '111':\r
            raise NNTPReplyError(resp)\r
        elem = resp.split()\r
        if len(elem) != 2:\r
            raise NNTPDataError(resp)\r
        date = elem[1][2:8]\r
        time = elem[1][-6:]\r
        if len(date) != 6 or len(time) != 6:\r
            raise NNTPDataError(resp)\r
        return resp, date, time\r
\r
\r
    def post(self, f):\r
        """Process a POST command.  Arguments:\r
        - f: file containing the article\r
        Returns:\r
        - resp: server response if successful"""\r
\r
        resp = self.shortcmd('POST')\r
        # Raises error_??? if posting is not allowed\r
        if resp[0] != '3':\r
            raise NNTPReplyError(resp)\r
        while 1:\r
            line = f.readline()\r
            if not line:\r
                break\r
            if line[-1] == '\n':\r
                line = line[:-1]\r
            if line[:1] == '.':\r
                line = '.' + line\r
            self.putline(line)\r
        self.putline('.')\r
        return self.getresp()\r
\r
    def ihave(self, id, f):\r
        """Process an IHAVE command.  Arguments:\r
        - id: message-id of the article\r
        - f:  file containing the article\r
        Returns:\r
        - resp: server response if successful\r
        Note that if the server refuses the article an exception is raised."""\r
\r
        resp = self.shortcmd('IHAVE ' + id)\r
        # Raises error_??? if the server already has it\r
        if resp[0] != '3':\r
            raise NNTPReplyError(resp)\r
        while 1:\r
            line = f.readline()\r
            if not line:\r
                break\r
            if line[-1] == '\n':\r
                line = line[:-1]\r
            if line[:1] == '.':\r
                line = '.' + line\r
            self.putline(line)\r
        self.putline('.')\r
        return self.getresp()\r
\r
    def quit(self):\r
        """Process a QUIT command and close the socket.  Returns:\r
        - resp: server response if successful"""\r
\r
        resp = self.shortcmd('QUIT')\r
        self.file.close()\r
        self.sock.close()\r
        del self.file, self.sock\r
        return resp\r
\r
\r
# Test retrieval when run as a script.\r
# Assumption: if there's a local news server, it's called 'news'.\r
# Assumption: if user queries a remote news server, it's named\r
# in the environment variable NNTPSERVER (used by slrn and kin)\r
# and we want readermode off.\r
if __name__ == '__main__':\r
    import os\r
    newshost = 'news' and os.environ["NNTPSERVER"]\r
    if newshost.find('.') == -1:\r
        mode = 'readermode'\r
    else:\r
        mode = None\r
    s = NNTP(newshost, readermode=mode)\r
    resp, count, first, last, name = s.group('comp.lang.python')\r
    print resp\r
    print 'Group', name, 'has', count, 'articles, range', first, 'to', last\r
    resp, subs = s.xhdr('subject', first + '-' + last)\r
    print resp\r
    for item in subs:\r
        print "%7s %s" % item\r
    resp = s.quit()\r
    print resp\r