# Copyright (C) 2010  Aldo Cortesi
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import Queue, mailcap, mimetypes, tempfile, os, subprocess, threading
import os.path
import cStringIO
import urwid.curses_display
import urwid
import controller, utils, filt, proxy


class Stop(Exception): pass


def format_keyvals(lst, key="key", val="text", space=5, indent=0):
    ret = []
    if lst:
        pad = max(len(i[0]) for i in lst) + space
        for i in lst:
            ret.extend(
                [
                    " "*indent,
                    (key, i[0]),
                    " "*(pad-len(i[0])),
                    (val, i[1]),
                    "\n"
                ]
            )
    return ret


#begin nocover

def int_version(v):
    SIG = 3
    v = urwid.__version__.split(".")
    x = 0
    for i in range(min(SIG, len(v))):
        x += int(v[i]) * 10**(SIG-i)
    return x
    

# We have to do this to be portable over 0.9.8 and 0.9.9 If compatibility
# becomes a pain to maintain, we'll just mandate 0.9.9 or newer.
class WWrap(urwid.WidgetWrap):
    if int_version(urwid.__version__) >= 990:
        def set_w(self, x):
            self._w = x
        def get_w(self):
            return self._w
        w = property(get_w, set_w)


class ReplayThread(threading.Thread):
    def __init__(self, flow, masterq):
        self.flow, self.masterq = flow, masterq
        threading.Thread.__init__(self)

    def run(self):
        try:
            server = proxy.ServerConnection(self.flow.request)
            response = server.read_response()
            response.send(self.masterq)
        except proxy.ProxyError, v:
            err = proxy.Error(self.flow.connection, v.msg)
            err.send(self.masterq)


class ConnectionItem(WWrap):
    def __init__(self, master, state, flow):
        self.master, self.state, self.flow = master, state, flow
        w = self.get_text()
        WWrap.__init__(self, w)

    def intercept(self):
        self.intercepting = True
        self.w = self.get_text()

    def get_text(self, nofocus=False):
        return urwid.Text(self.flow.get_text(nofocus))

    def selectable(self):
        return True

    def keypress(self, (maxcol,), key):
        if key == "a":
            self.flow.accept_intercept()
            self.master.sync_list_view()
        elif key == "A":
            self.master.accept_all()
            self.master.sync_list_view()
        elif key == "d":
            if not self.state.delete_flow(self.flow):
                self.master.statusbar.message("Can't delete connection mid-intercept.")
            self.master.sync_list_view()
        elif key == "r":
            r = self.state.replay(self.flow, self.master.masterq)
            if r:
                self.master.statusbar.message(r)
            self.master.sync_list_view()
        elif key == "R":
            self.state.revert(self.flow)
            self.master.sync_list_view()
        elif key == "z":
            self.master.kill_connection(self.flow)
        elif key == "enter":
            if self.flow.request:
                self.master.view_connection(self.flow)
        return key


class ConnectionListView(urwid.ListWalker):
    def __init__(self, master, state):
        self.master, self.state = master, state

    def get_focus(self):
        f, i = self.state.get_focus()
        f = ConnectionItem(self.master, self.state, f) if f else None
        return f, i

    def set_focus(self, focus):
        ret = self.state.set_focus(focus)
        self._modified()
        return ret

    def get_next(self, pos):
        f, i = self.state.get_next(pos)
        f = ConnectionItem(self.master, self.state, f) if f else None
        return f, i

    def get_prev(self, pos):
        f, i = self.state.get_prev(pos)
        f = ConnectionItem(self.master, self.state, f) if f else None
        return f, i


class ConnectionViewHeader(WWrap):
    def __init__(self, flow):
        self.flow = flow
        self.w = urwid.Text(flow.get_text(nofocus=True, padding=0))

    def refresh_connection(self, f):
        if f == self.flow:
            self.w = urwid.Text(f.get_text(nofocus=True, padding=0))


class ConnectionView(WWrap):
    REQ = 0
    RESP = 1
    tabs = ["Request", "Response"]
    methods = [
        ("get", "g"),
        ("post", "p"),
        ("put", "u"),
        ("head", "h"),
        ("trace", "t"),
        ("delete", "d"),
        ("options", "o"),
    ]
    def __init__(self, master, state, flow):
        self.master, self.state, self.flow = master, state, flow
        self.binary = False
        self.view_request()

    def _tab(self, content, active):
        if active:
            attr = "heading"
        else:
            attr = "inactive"
        p = urwid.Text(content)
        p = urwid.Padding(p, align="left", width=("relative", 100))
        p = urwid.AttrWrap(p, attr)
        return p

    def wrap_body(self, active, body):
        parts = []

        if self.flow.intercepting and not self.flow.request.acked:
            qt = "Request (intercepted)"
        else:
            qt = "Request"
        if active == self.REQ:
            parts.append(self._tab(qt, True))
        else:
            parts.append(self._tab(qt, False))

        if self.flow.response:
            if self.flow.intercepting and not self.flow.response.acked:
                st = "Response (intercepted)"
            else:
                st = "Response"
            if active == self.RESP:
                parts.append(self._tab(st, True))
            else:
                parts.append(self._tab(st, False))

        h = urwid.Columns(parts, dividechars=1)
        f = urwid.Frame(
                    body,
                    header=h
                )
        return f

    def _conn_text(self, conn):
        txt = []
        txt.extend(
            format_keyvals(
                [(h+":", v) for (h, v) in sorted(conn.headers.itemPairs())],
                key = "header",
                val = "text"
            )
        )
        txt.append("\n\n")
        if conn.content:
            if self.binary or utils.isBin(conn.content):
                for offset, hex, s in utils.hexdump(conn.content):
                    txt.extend([
                        ("offset", offset),
                        " ",
                        ("text", hex),
                        "   ",
                        ("text", s),
                        "\n"
                    ])
            else:
                for i in conn.content.splitlines():
                    txt.append(
                        ("text", i),
                    )
                    txt.append(
                        ("text", "\n"),
                    )
        return urwid.ListBox([urwid.Text(txt)])

    def view_request(self):
        self.viewing = self.REQ
        body = self._conn_text(self.flow.request)
        self.w = self.wrap_body(self.REQ, body)

    def view_response(self):
        if self.flow.response:
            self.viewing = self.RESP
            body = self._conn_text(self.flow.response)
            self.w = self.wrap_body(self.RESP, body)

    def refresh_connection(self, c=None):
        if c == self.flow:
            if self.viewing == self.REQ:
                self.view_request()
            else:
                self.view_response()

    def _spawn_editor(self, data):
        fd, name = tempfile.mkstemp('', "mproxy")
        os.write(fd, data)
        os.close(fd)
        c = os.environ.get("EDITOR")
        #If no EDITOR is set, assume 'vi'
        if not c:
            c = "vi"
        cmd = [c, name]
        try:
            ret = subprocess.call(cmd)
        except:
            self.master.statusbar.message("Can't start editor: %s" % c)
            self.master.ui._curs_set(1)
            self.master.ui.clear()
            os.unlink(name)
            return data
        # Not sure why, unless we do this we get a visible cursor after
        # spawning 'less'.
        self.master.ui._curs_set(1)
        self.master.ui.clear()
        data = open(name).read()
        os.unlink(name)
        return data

    def edit_method(self, m):
        for i in self.methods:
            if i[1] == m:
                self.flow.request.method = i[0].upper()
        self.master.refresh_connection(self.flow)

    def save_connection(self, path):
        if not path:
            return 
        if self.viewing == self.REQ:
            c = self.flow.request
        else:
            c = self.flow.response
        path = os.path.expanduser(path)
        try:
            f = file(path, "w")
            f.write(str(c.headers))
            f.write("\r\n")
            f.write(str(c.content))
            f.close()
        except IOError, v:
            self.master.statusbar.message(str(v))

    def edit(self, part):
        if self.viewing == self.REQ:
            conn = self.flow.request
        else:
            conn = self.flow.response
        if part == "b":
            conn.content = self._spawn_editor(conn.content or "")
        elif part == "h":
            headertext = self._spawn_editor(repr(conn.headers))
            headers = utils.Headers()
            fp = cStringIO.StringIO(headertext)
            headers.read(fp)
            conn.headers = headers
        elif part == "u" and self.viewing == self.REQ:
            conn = self.flow.request
            url = self._spawn_editor(conn.url())
            url = url.strip()
            if not conn.set_url(url):
                return "Invalid URL."
        elif part == "m" and self.viewing == self.REQ:
            self.master.prompt_onekey("Method ", self.methods, self.edit_method)
            key = None
        self.master.refresh_connection(self.flow)

    def keypress(self, size, key):
        if key == "tab":
            if self.viewing == self.REQ:
                self.view_response()
            else:
                self.view_request()
        elif key in ("up", "down", "page up", "page down"):
            # Why doesn't this just work??
            self.w.body.keypress(size, key)
        elif key == "a":
            self.flow.accept_intercept()
            self.master.view_connection(self.flow)
        elif key == "A":
            self.master.accept_all()
            self.master.view_connection(self.flow)
        elif key == "b":
            self.binary = not self.binary
            self.master.refresh_connection(self.flow)
        elif key == "e":
            if self.viewing == self.REQ:
                self.master.prompt_onekey(
                    "Edit request ",
                    (
                        ("header", "h"),
                        ("body", "b"),
                        ("url", "u"),
                        ("method", "m")
                    ),
                    self.edit
                )
            else:
                self.master.prompt_onekey(
                    "Edit response ",
                    (
                        ("header", "h"),
                        ("body", "b"),
                    ),
                    self.edit
                )
            key = None
        elif key == "r":
            r = self.state.replay(self.flow, self.master.masterq)
            if r:
                self.master.statusbar.message(r)
            self.master.refresh_connection(self.flow)
        elif key == "R":
            self.state.revert(self.flow)
            self.master.refresh_connection(self.flow)
        elif key == "S":
            if self.viewing == self.REQ:
                self.master.prompt("Save request: ", self.save_connection)
            else:
                self.master.prompt("Save response: ", self.save_connection)
        elif key == "v":
            if self.viewing == self.REQ:
                conn = self.flow.request
            else:
                conn = self.flow.response
            if conn.content:
                t = conn.headers.get("content-type", [None])
                t = t[0]
                if t:
                    ext = mimetypes.guess_extension(t) or ""
                else:
                    ext = ""
                fd, name = tempfile.mkstemp(ext, "mproxy")
                os.write(fd, conn.content)
                os.close(fd)
                t = conn.headers.get("content-type", [None])
                t = t[0]

                cmd = None
                shell = False

                if t:
                    c = mailcap.getcaps()
                    cmd, _ = mailcap.findmatch(c, t, filename=name)
                    if cmd:
                        shell = True
                if not cmd:
                    c = os.environ.get("PAGER") or os.environ.get("EDITOR")
                    cmd = [c, name]
                ret = subprocess.call(cmd, shell=shell)
                # Not sure why, unless we do this we get a visible cursor after
                # spawning 'less'.
                self.master.ui._curs_set(1)
                self.master.ui.clear()
                os.unlink(name)
        return key


class ActionBar(WWrap):
    def __init__(self):
        self.message("")

    def selectable(self):
        return True

    def prompt(self, prompt):
        self.w = urwid.Edit(prompt)

    def message(self, message):
        self.w = urwid.Text(message)


class StatusBar(WWrap):
    def __init__(self, master, text):
        self.master, self.text = master, text
        self.ab = ActionBar()
        self.ib = urwid.AttrWrap(urwid.Text(""), 'foot')
        self.w = urwid.Pile([self.ib, self.ab])
        self.redraw()

    def redraw(self):
        status = urwid.Columns([
            urwid.Text([('title', "mproxy:%s"%self.master.server.port)]),
            urwid.Text(
                [
                    self.text,
                    ('text', "%5s"%("[%s]"%len(self.master.state.flow_list)))
                ],
                align="right"),
        ])
        self.ib.set_w(status)

    def update(self, text):
        self.text = text
        self.redraw()

    def selectable(self):
        return True

    def get_edit_text(self):
        return self.ab.w.get_edit_text()

    def prompt(self, prompt):
        self.ab.prompt(prompt)

    def message(self, msg):
        self.ab.message(msg)


#end nocover

class ReplayConnection:
    pass


class Flow:
    def __init__(self, connection):
        self.connection = connection
        self.request, self.response, self.error = None, None, None
        self.waiting = True
        self.focus = False
        self.intercepting = False
        self._backup = None

    def backup(self):
        if not self._backup:
            self._backup = [
                self.connection.copy() if self.connection else None,
                self.request.copy() if self.request else None,
                self.response.copy() if self.response else None,
                self.error.copy() if self.error else None,
            ]

    def revert(self):
        if self._backup:
            self.waiting = False
            restore = [i.copy() if i else None for i in self._backup]
            self.connection, self.request, self.response, self.error = restore

    def match(self, pattern):
        if pattern:
            if self.response:
                return pattern(self.response)
            elif self.request:
                return pattern(self.request)
        return False

    def is_replay(self):
        return isinstance(self.connection, ReplayConnection)

    def get_text(self, nofocus=False, padding=3):
        if not self.request and not self.response:
            txt = [
                ("title", " Connection from %s..."%(self.connection.address)),
            ]
        else:
            txt = [
                ("ack", "!") if self.intercepting and not self.request.acked else " ",
                ("method", self.request.method),
                " ",
                (
                    "text" if (self.response or self.error) else "title",
                    self.request.url(),
                ),
            ]
            if self.response or self.error or self.is_replay():
                txt.append("\n" + " "*(padding+2))
                if self.is_replay():
                    txt.append(("method", "[replay] "))
                if not (self.response or self.error):
                    txt.append(("text", "waiting for response..."))

            if self.response:
                txt.append(
                   ("ack", "!") if self.intercepting and not self.response.acked else " "
                )
                txt.append("-> ")
                if self.response.code in [200, 304]:
                    txt.append(("goodcode", str(self.response.code)))
                else:
                    txt.append(("error", str(self.response.code)))
                t = self.response.headers.get("content-type")
                if t:
                    t = t[0].split(";")[0]
                    txt.append(("text", " %s"%t))
                if self.response.content:
                    txt.append(", %s"%utils.pretty_size(len(self.response.content)))
            elif self.error:
                txt.append(
                   ("error", self.error.msg)
                )
        if self.focus and not nofocus:
            txt.insert(0, ("focus", ">>" + " "*(padding-2)))
        else:
            txt.insert(0, " "*padding)
        return txt

    def kill(self):
        if self.intercepting:
            if not self.request.acked:
                self.request.kill = True
                self.request.ack()
            elif self.response and not self.response.acked:
                self.response.kill = True
                self.response.ack()
            self.intercepting = False

    def intercept(self):
        self.intercepting = True

    def accept_intercept(self):
        if self.request:
            if not self.request.acked:
                self.request.ack()
            elif self.response and not self.response.acked:
                self.response.ack()
            self.intercepting = False


class State:
    def __init__(self):
        self.flow_map = {}
        self.flow_list = []
        self.focus = None
        # These are compiled filt expressions:
        self.limit = None
        self.intercept = None
        self.beep = None

    def add_browserconnect(self, f):
        self.flow_list.insert(0, f)
        self.flow_map[f.connection] = f
        if self.focus is None:
            self.set_focus(0)
        else:
            self.set_focus(self.focus + 1)

    def add_request(self, req):
        f = self.flow_map.get(req.connection)
        if not f:
            return False
        f.request = req
        return f

    def add_response(self, resp):
        f = self.flow_map.get(resp.request.connection)
        if not f:
            return False
        f.response = resp
        f.waiting = False
        f.backup()
        return f

    def add_error(self, err):
        f = self.flow_map.get(err.connection)
        if not f:
            return False
        f.error = err
        f.waiting = False
        f.backup()
        return f

    @property
    def view(self):
        if self.limit:
            return [i for i in self.flow_list if i.match(self.limit)]
        else:
            return self.flow_list[:]

    def set_limit(self, limit):
        """
            Limit is a compiled filter expression, or None.
        """
        self.limit = limit
        self.set_focus(self.focus)

    def get_connection(self, itm):
        if isinstance(itm, (proxy.BrowserConnection, ReplayConnection)):
            return itm
        elif hasattr(itm, "connection"):
            return itm.connection
        elif hasattr(itm, "request"):
            return itm.request.connection

    def lookup(self, itm):
        """
            Checks for matching connection, using a Flow, Replay Connection,
            BrowserConnection, Request, Response or Error object. Returns None
            if not found.
        """
        connection = self.get_connection(itm)
        return self.flow_map.get(connection)

    def get_focus(self):
        if not self.view:
            return None, None
        return self.view[self.focus], self.focus

    def set_focus(self, idx):
        if self.view:
            for i in self.view:
                i.focus = False
            if idx >= len(self.view):
                idx = len(self.view) - 1
            elif idx < 0:
                idx = 0
            self.view[idx].focus = True
            self.focus = idx

    def get_from_pos(self, pos):
        if len(self.view) <= pos or pos < 0:
            return None, None
        return self.view[pos], pos

    def get_next(self, pos):
        return self.get_from_pos(pos+1)

    def get_prev(self, pos):
        return self.get_from_pos(pos-1)

    def delete_flow(self, f):
        if not f.intercepting:
            c = self.get_connection(f)
            self.view[self.focus].focus = False
            del self.flow_map[c]
            self.flow_list.remove(f)
            self.set_focus(self.focus)
            return True
        return False

    def clear(self):
        for i in self.flow_list[:]:
            self.delete_flow(i)

    def accept_all(self):
        for i in self.flow_list[:]:
            i.accept_intercept()

    def kill_flow(self, f):
        f.kill()
        self.delete_flow(f)

    def revert(self, f):
        """
            Replaces the matching connection object with a ReplayConnection object.
        """
        conn = self.get_connection(f)
        del self.flow_map[conn]
        f.revert()
        self.flow_map[f.connection] = f

    def replay(self, f, masterq):
        """
            Replaces the matching connection object with a ReplayConnection object.

            Returns None if successful, or error message if not.
        """
        #begin nocover
        if f.intercepting:
            return "Can't replay while intercepting..."
        if f.request:
            f.backup()
            conn = self.get_connection(f)
            del self.flow_map[conn]
            rp = ReplayConnection()
            f.connection = rp
            f.request.connection = rp
            if f.request.content:
                f.request.headers["content-length"] = [str(len(f.request.content))]
            f.response = None
            f.error = None
            self.flow_map[rp] = f
            rt = ReplayThread(f, masterq)
            rt.start()
        #end nocover


#begin nocover

class ConsoleMaster(controller.Master):
    palette = []
    footer_text_default = [
        ('key', "?"), ":help ",
        ('key', "q"), ":exit ",
    ]
    footer_text_connview = [
        ('key', "tab"), ":toggle view ",
        ('key', "?"), ":help ",
        ('key', "q"), ":back ",
    ]
    def __init__(self, server, options):
        self.set_palette()
        controller.Master.__init__(self, server)
        self.state = State()

        self.stickycookie = None
        self.stickyhosts = {}

    def set_palette(self):
        self.palette = [
            ('body', 'black', 'dark cyan', 'standout'),
            ('foot', 'light gray', 'default'),
            ('title', 'white', 'default',),
            ('editline', 'white', 'default',),

            # Help
            ('key', 'light cyan', 'default', 'underline'),
            ('head', 'white', 'default'),
            ('text', 'light gray', 'default'),

            # List and Connections
            ('method', 'dark cyan', 'default'),
            ('focus', 'yellow', 'default'),
            ('goodcode', 'light green', 'default'),
            ('error', 'light red', 'default'),
            ('header', 'dark cyan', 'default'),
            ('heading', 'white', 'dark blue'),
            ('inactive', 'dark gray', 'default'),
            ('ack', 'light red', 'default'),

            # Hex view
            ('offset', 'dark cyan', 'default'),
        ]

    def run(self):
        self.ui = urwid.curses_display.Screen()
        self.ui.register_palette(self.palette)
        self.conn_list_view = ConnectionListView(self, self.state)

        self.view = None
        self.statusbar = None
        self.header = None
        self.body = None

        self.prompting = False
        self.onekey = False
        self.view_connlist()

        self.ui.run_wrapper(self.loop)
        # If True, quit just pops out to connection list view.
        self.nested = False

    def make_view(self):
        self.view = urwid.Frame(
                        self.body,
                        header = self.header,
                        footer = self.statusbar
                    )
        self.view.set_focus("body")

    def view_connlist(self):
        self.body = urwid.ListBox(self.conn_list_view)
        self.statusbar = StatusBar(self, self.footer_text_default)
        self.header = None
        self.nested = False
        self.make_view()

    def view_connection(self, flow):
        self.statusbar = StatusBar(self, self.footer_text_connview)
        self.body = ConnectionView(self, self.state, flow)
        self.header = ConnectionViewHeader(flow)
        self.nested = True
        self.make_view()

    def helptext(self):
        text = []
        text.extend([("head", "Global keys:\n")])
        keys = [
            ("A", "accept all intercepted connections"),
            ("a", "accept this intercepted connection"),
            ("B", "set beep filter pattern"),
            ("i", "set interception pattern"),
            ("j, k", "up, down"),
            ("l", "set limit filter pattern"),
            ("q", "quit / return to connection list"),
            ("r", "replay request"),
            ("s", "set sticky cookie expression"),
            ("R", "revert changes to request"),
            ("page up/down", "page up/down"),
            ("space", "page down"),
            ("enter", "view connection"),
        ]
        text.extend(format_keyvals(keys, key="key", val="text", indent=4))

        text.extend([("head", "\n\nConnection list keys:\n")])
        keys = [
            ("C", "clear connection list"),
            ("d", "delete connection from view"),
            ("z", "kill and delete connection, even if it's mid-intercept"),
        ]
        text.extend(format_keyvals(keys, key="key", val="text", indent=4))

        text.extend([("head", "\n\nConnection view keys:\n")])
        keys = [
            ("b", "toggle hexdump view"),
            ("e", "edit response/request"),
            ("S", "save request or response"),
            ("v", "view contents in external viewer"),
            ("tab", "toggle response/request view"),
        ]
        text.extend(format_keyvals(keys, key="key", val="text", indent=4))

        text.extend([("head", "\n\nFilter expressions:\n")])
        f = []
        for i in filt.filt_unary:
            f.append(
                ("~%s"%i.code, i.help)
            )
        for i in filt.filt_rex:
            f.append(
                ("~%s regex"%i.code, i.help)
            )
        for i in filt.filt_int:
            f.append(
                ("~%s int"%i.code, i.help)
            )
        f.sort()
        f.extend(
            [
                ("!", "unary not"),
                ("&", "and"),
                ("|", "or"),
                ("(...)", "grouping"),
            ]
        )
        text.extend(format_keyvals(f, key="key", val="text", indent=4))

        text.extend(
           [
                "\n",
                ("text", "    Regexes are Python-style.\n"),
                ("text", "    Regexes can be specified as quoted strings.\n"),
                ("text", "    Header matching (~h, ~hq, ~hs) is against a string of the form \"name: value\".\n"),
                ("text", "    Expressions with no operators are regex matches against URL.\n"),
                ("text", "    Default binary operator is &.\n"),
                ("head", "\n    Examples:\n"),
           ]
        )
        examples = [
                ("google\.com", "Url containing \"google.com"),
                ("~r ~b test", "Requests where body contains \"test\""),
                ("!(~r & ~t \"text/html\")", "Anything but requests with a text/html content type."),
        ]
        text.extend(format_keyvals(examples, key="key", val="text", indent=4))
        return urwid.ListBox([urwid.Text(text)])

    def view_help(self):
        self.body = self.helptext()
        self.header = None
        self.nested = True
        self.make_view()

    def prompt(self, prompt, callback):
        self.statusbar.prompt(prompt)
        self.view.set_focus("footer")
        self.prompting = callback

    def prompt_onekey(self, prompt, keys, callback):
        """
            Keys are a set of (word, key) tuples. The appropriate key in the
            word is highlighted. 
        """
        prompt = [prompt, "("]
        mkup = []
        for i, e in enumerate(keys):
            parts = e[0].split(e[1], 1)
            if parts[0]:
                mkup.append(("text", parts[0]))
            mkup.append(("key", e[1]))
            if parts[1]:
                mkup.append(("text", parts[1]))
            if i < len(keys)-1:
                mkup.append(",")
        prompt.extend(mkup)
        prompt.append(")? ")
        self.onekey = "".join([i[1] for i in keys])
        self.prompt(prompt, callback)

    def prompt_done(self):
        self.prompting = False
        self.onekey = False
        self.view.set_focus("body")
        self.statusbar.message("")

    def prompt_execute(self, txt=None):
        if not txt:
            txt = self.statusbar.get_edit_text()
        p = self.prompting
        self.prompt_done()
        msg = p(txt)
        if msg:
            self.statusbar.message(msg)

    def prompt_cancel(self):
        self.prompt_done()

    def accept_all(self):
        self.state.accept_all()

    def set_limit(self, txt):
        if txt:
            f = filt.parse(txt)
            if not f:
                return "Invalid filter expression."
            self.state.set_limit(f)
        else:
            self.state.set_limit(None)
        self.sync_list_view()

    def set_intercept(self, txt):
        if txt:
            self.state.intercept = filt.parse(txt)
            if not self.state.intercept:
                return "Invalid filter expression."
        else:
            self.state.intercept = None
        self.sync_list_view()

    def set_beep(self, txt):
        if txt:
            self.state.beep = filt.parse(txt)
            if not self.state.beep:
                return "Invalid filter expression."
        else:
            self.state.beep = None

    def set_stickycookie(self, txt):
        if txt:
            self.stickycookie = filt.parse(txt)
            if not self.stickycookie:
                return "Invalid filter expression."
        else:
            self.stickyhosts = {}
            self.stickycookie = None

    def drawscreen(self):
        size = self.ui.get_cols_rows()
        canvas = self.view.render(size, focus=1)
        self.ui.draw_screen(size, canvas)
        return size

    def loop(self):
        q = Queue.Queue()
        self.masterq = q
        slave = controller.Slave(q, self.server)
        slave.start()
        try:
            while not self._shutdown:
                size = self.drawscreen()
                self.statusbar.redraw()
                self.tick(q)
                self.ui.set_input_timeouts(max_wait=0.1)
                keys = self.ui.get_input()
                for k in keys:
                    if self.prompting:
                        if k == "esc":
                            self.prompt_cancel()
                            k = None
                        elif self.onekey:
                            if k == "enter":
                                self.prompt_cancel()
                            elif k in self.onekey:
                                self.prompt_execute(k)
                            k = None
                        elif k == "enter":
                            self.prompt_execute()
                            k = None
                    else:
                        self.statusbar.message("")
                        if k == "?":
                            self.view_help()
                        elif k == "l":
                            self.prompt("Limit: ", self.set_limit)
                            k = None
                        elif k == "i":
                            self.prompt("Intercept: ", self.set_intercept)
                            k = None
                        elif k == "B":
                            self.prompt("Beep: ", self.set_beep)
                            k = None
                        elif k == "C":
                            self.clear_connections()
                        elif k == "j":
                            k = "down"
                        elif k == "k":
                            k = "up"
                        elif k == " ":
                            k = "page down"
                        elif k in ('q','Q'):
                            if self.nested:
                                self.view_connlist()
                            else:
                                raise Stop
                        elif k == "s":
                            self.prompt("Sticky cookie: ", self.set_stickycookie)
                            k = None
                    if k:
                        self.view.keypress(size, k)
        except (Stop, KeyboardInterrupt):
            pass
        self.shutdown()

    def shutdown(self):
        for i in self.state.flow_list:
            i.kill()
        controller.Master.shutdown(self)

    def sync_list_view(self):
        self.conn_list_view._modified()

    def clear_connections(self):
        self.state.clear()
        self.sync_list_view()

    def delete_connection(self, f):
        self.state.delete_flow(f)
        self.sync_list_view()

    def kill_connection(self, f):
        self.state.kill_flow(f)

    def refresh_connection(self, c):
        if hasattr(self.header, "refresh_connection"):
            self.header.refresh_connection(c)
        if hasattr(self.body, "refresh_connection"):
            self.body.refresh_connection(c)
        if hasattr(self.statusbar, "refresh_connection"):
            self.statusbar.refresh_connection(c)

    def process_flow(self, f, r):
        if f.match(self.state.beep):
            urwid.curses_display.curses.beep()
        if f.match(self.state.intercept) and not f.is_replay():
            f.intercept()
        else:
            r.ack()
        self.sync_list_view()
        self.refresh_connection(f)

    # Handlers
    def handle_browserconnection(self, r):
        f = Flow(r)
        self.state.add_browserconnect(f)
        r.ack()
        self.sync_list_view()

    def handle_error(self, r):
        f = self.state.add_error(r)
        if not f:
            r.ack()
        else:
            self.sync_list_view()
            self.refresh_connection(f)

    def handle_request(self, r):
        f = self.state.add_request(r)
        if not f:
            r.ack()
        else:
            if f.match(self.stickycookie):
                hid = (f.request.host, f.request.port)
                if f.request.headers.has_key("cookie"):
                    self.stickyhosts[hid] = f.request.headers["cookie"]
                elif hid in self.stickyhosts:
                    f.request.headers["cookie"] = self.stickyhosts[hid]
            self.process_flow(f, r)

    def handle_response(self, r):
        f = self.state.add_response(r)
        if not f:
            r.ack()
        else:
            if f.match(self.stickycookie):
                hid = (f.request.host, f.request.port)
                if f.response.headers.has_key("set-cookie"):
                    self.stickyhosts[hid] = f.response.headers["set-cookie"]
            self.process_flow(f, r)