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import abc
import collections
import copy
import typing
import urwid
from urwid.text_layout import calc_coords
import mitmproxy.command
import mitmproxy.flow
import mitmproxy.master
import mitmproxy.types
class Completer:
@abc.abstractmethod
def cycle(self, forward: bool = True) -> str:
raise NotImplementedError()
class ListCompleter(Completer):
def __init__(
self,
start: str,
options: typing.Sequence[str],
) -> None:
self.start = start
self.options: typing.List[str] = []
for o in options:
if o.startswith(start):
self.options.append(o)
self.options.sort()
self.offset = 0
def cycle(self, forward: bool = True) -> str:
if not self.options:
return self.start
ret = self.options[self.offset]
delta = 1 if forward else -1
self.offset = (self.offset + delta) % len(self.options)
return ret
class CompletionState(typing.NamedTuple):
completer: Completer
parsed: typing.Sequence[mitmproxy.command.ParseResult]
class CommandBuffer:
def __init__(self, master: mitmproxy.master.Master, start: str = "") -> None:
self.master = master
self.text = start
# Cursor is always within the range [0:len(buffer)].
self._cursor = len(self.text)
self.completion: typing.Optional[CompletionState] = None
@property
def cursor(self) -> int:
return self._cursor
@cursor.setter
def cursor(self, x) -> None:
if x < 0:
self._cursor = 0
elif x > len(self.text):
self._cursor = len(self.text)
else:
self._cursor = x
def render(self):
parts, remaining = self.master.commands.parse_partial(self.text)
ret = []
if not parts:
# Means we just received the leader, so we need to give a blank
# text to the widget to render or it crashes
ret.append(("text", ""))
else:
for p in parts:
if p.valid:
if p.type == mitmproxy.types.Cmd:
ret.append(("commander_command", p.value))
else:
ret.append(("text", p.value))
elif p.value:
ret.append(("commander_invalid", p.value))
if remaining:
if parts[-1].type != mitmproxy.types.Space:
ret.append(("text", " "))
for param in remaining:
ret.append(("commander_hint", f"{param} "))
return ret
def left(self) -> None:
self.cursor = self.cursor - 1
def right(self) -> None:
self.cursor = self.cursor + 1
def cycle_completion(self, forward: bool = True) -> None:
if not self.completion:
parts, remaining = self.master.commands.parse_partial(self.text[:self.cursor])
if parts and parts[-1].type != mitmproxy.types.Space:
type_to_complete = parts[-1].type
cycle_prefix = parts[-1].value
parsed = parts[:-1]
elif remaining:
type_to_complete = remaining[0].type
cycle_prefix = ""
parsed = parts
else:
return
ct = mitmproxy.types.CommandTypes.get(type_to_complete, None)
if ct:
self.completion = CompletionState(
completer=ListCompleter(
cycle_prefix,
ct.completion(self.master.commands, type_to_complete, cycle_prefix)
),
parsed=parsed,
)
if self.completion:
nxt = self.completion.completer.cycle(forward)
buf = "".join([i.value for i in self.completion.parsed]) + nxt
self.text = buf
self.cursor = len(self.text)
def backspace(self) -> None:
if self.cursor == 0:
return
self.text = self.text[:self.cursor - 1] + self.text[self.cursor:]
self.cursor = self.cursor - 1
self.completion = None
def insert(self, k: str) -> None:
"""
Inserts text at the cursor.
"""
# We don't want to insert a space before the command
if k == ' ' and self.text[0:self.cursor].strip() == '':
return
self.text = self.text[:self.cursor] + k + self.text[self.cursor:]
self.cursor += len(k)
self.completion = None
class CommandHistory:
def __init__(self, master: mitmproxy.master.Master, size: int = 30) -> None:
self.saved_commands: collections.deque = collections.deque(
[CommandBuffer(master, "")],
maxlen=size
)
self.index: int = 0
@property
def last_index(self):
return len(self.saved_commands) - 1
def get_next(self) -> typing.Optional[CommandBuffer]:
if self.index < self.last_index:
self.index = self.index + 1
return self.saved_commands[self.index]
return None
def get_prev(self) -> typing.Optional[CommandBuffer]:
if self.index > 0:
self.index = self.index - 1
return self.saved_commands[self.index]
return None
def add_command(self, command: CommandBuffer, execution: bool = False) -> None:
if self.index == self.last_index or execution:
last_item = self.saved_commands[-1]
last_item_empty = not last_item.text
if last_item.text == command.text or (last_item_empty and execution):
self.saved_commands[-1] = copy.copy(command)
else:
self.saved_commands.append(command)
if not execution and self.index < self.last_index:
self.index += 1
if execution:
self.index = self.last_index
class CommandEdit(urwid.WidgetWrap):
leader = ": "
def __init__(self, master: mitmproxy.master.Master,
text: str, history: CommandHistory) -> None:
super().__init__(urwid.Text(self.leader))
self.master = master
self.cbuf = CommandBuffer(master, text)
self.history = history
self.update()
def keypress(self, size, key) -> None:
if key == "backspace":
self.cbuf.backspace()
elif key == "left":
self.cbuf.left()
elif key == "right":
self.cbuf.right()
elif key == "up":
self.history.add_command(self.cbuf)
self.cbuf = self.history.get_prev() or self.cbuf
elif key == "down":
self.cbuf = self.history.get_next() or self.cbuf
elif key == "shift tab":
self.cbuf.cycle_completion(False)
elif key == "tab":
self.cbuf.cycle_completion()
elif len(key) == 1:
self.cbuf.insert(key)
self.update()
def update(self) -> None:
self._w.set_text([self.leader, self.cbuf.render()])
def render(self, size, focus=False) -> urwid.Canvas:
(maxcol,) = size
canv = self._w.render((maxcol,))
canv = urwid.CompositeCanvas(canv)
canv.cursor = self.get_cursor_coords((maxcol,))
return canv
def get_cursor_coords(self, size) -> typing.Tuple[int, int]:
p = self.cbuf.cursor + len(self.leader)
trans = self._w.get_line_translation(size[0])
x, y = calc_coords(self._w.get_text()[0], trans, p)
return x, y
def get_edit_text(self) -> str:
return self.cbuf.text
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