# hgweb/request.py - An http request from either CGI or the standalone server.

#

# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>

# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

import socket, cgi, errno

from mercurial import util

from common import ErrorResponse, statusmessage, HTTP_NOT_MODIFIED

shortcuts = {

    'cl': [('cmd', ['changelog']), ('rev', None)],

    'sl': [('cmd', ['shortlog']), ('rev', None)],

    'cs': [('cmd', ['changeset']), ('node', None)],

    'f': [('cmd', ['file']), ('filenode', None)],

    'fl': [('cmd', ['filelog']), ('filenode', None)],

    'fd': [('cmd', ['filediff']), ('node', None)],

    'fa': [('cmd', ['annotate']), ('filenode', None)],

    'mf': [('cmd', ['manifest']), ('manifest', None)],

    'ca': [('cmd', ['archive']), ('node', None)],

    'tags': [('cmd', ['tags'])],

    'tip': [('cmd', ['changeset']), ('node', ['tip'])],

    'static': [('cmd', ['static']), ('file', None)]

}

def normalize(form):

    # first expand the shortcuts

    for k in shortcuts.iterkeys():

        if k in form:

            for name, value in shortcuts[k]:

                if value is None:

                    value = form[k]

                form[name] = value

            del form[k]

    # And strip the values

    for k, v in form.iteritems():

        form[k] = [i.strip() for i in v]

    return form

class wsgirequest(object):

    """Higher-level API for a WSGI request.

    WSGI applications are invoked with 2 arguments. They are used to

    instantiate instances of this class, which provides higher-level APIs

    for obtaining request parameters, writing HTTP output, etc.

    """

    def __init__(self, wsgienv, start_response):

        version = wsgienv['wsgi.version']

        if (version < (1, 0)) or (version >= (2, 0)):

            raise RuntimeError("Unknown and unsupported WSGI version %d.%d"

                               % version)

        self.inp = wsgienv['wsgi.input']

        self.err = wsgienv['wsgi.errors']

        self.threaded = wsgienv['wsgi.multithread']

        self.multiprocess = wsgienv['wsgi.multiprocess']

        self.run_once = wsgienv['wsgi.run_once']

        self.env = wsgienv

        self.form = normalize(cgi.parse(self.inp,

                                        self.env,

                                        keep_blank_values=1))

        self._start_response = start_response

        self.server_write = None

        self.headers = []

    def __iter__(self):

        return iter([])

    def read(self, count=-1):

        return self.inp.read(count)

    def drain(self):

        '''need to read all data from request, httplib is half-duplex'''

        length = int(self.env.get('CONTENT_LENGTH') or 0)

        for s in util.filechunkiter(self.inp, limit=length):

            pass

    def respond(self, status, type, filename=None, body=None):

        if self._start_response is not None:

            self.headers.append(('Content-Type', type))

            if filename:

                            .replace('\\', '\\\\').replace('"', '\\"'))

                self.headers.append(('Content-Disposition',

                                     'inline; filename="%s"' % filename))

            if body is not None:

                self.headers.append(('Content-Length', str(len(body))))

            for k, v in self.headers:

                if not isinstance(v, str):

                    raise TypeError('header value must be string: %r' % (v,))

            if isinstance(status, ErrorResponse):

                self.headers.extend(status.headers)

                if status.code == HTTP_NOT_MODIFIED:

                    # RFC 2616 Section 10.3.5: 304 Not Modified has cases where

                    # it MUST NOT include any headers other than these and no

                    # body

                    self.headers = [(k, v) for (k, v) in self.headers if

                                    k in ('Date', 'ETag', 'Expires',

                                          'Cache-Control', 'Vary')]

                status = statusmessage(status.code, str(status))

            elif status == 200:

                status = '200 Script output follows'

            elif isinstance(status, int):

                status = statusmessage(status)

            self.server_write = self._start_response(status, self.headers)

            self._start_response = None

            self.headers = []

        if body is not None:

            self.write(body)

            self.server_write = None

    def write(self, thing):

        if thing:

            try:

                self.server_write(thing)

            except socket.error as inst:

                if inst[0] != errno.ECONNRESET:

                    raise

    def writelines(self, lines):

        for line in lines:

            self.write(line)

    def flush(self):

        return None

    def close(self):

        return None

def wsgiapplication(app_maker):

    '''For compatibility with old CGI scripts. A plain hgweb() or hgwebdir()

    can and should now be used as a WSGI application.'''

    application = app_maker()

    def run_wsgi(env, respond):

        return application(env, respond)

    return run_wsgi