1 files changed, 177 insertions, 0 deletions
diff --git a/src/hydrilla/proxy/addon.py b/src/hydrilla/proxy/addon.py
new file mode 100644
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+++ b/src/hydrilla/proxy/addon.py
@@ -0,0 +1,177 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Haketilo addon for Mitmproxy.
+#
+# This file is part of Hydrilla&Haketilo.
+#
+# Copyright (C) 2022 Wojtek Kosior
+#
+# 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 <https://www.gnu.org/licenses/>.
+#
+#
+# I, Wojtek Kosior, thereby promise not to sue for violation of this
+# file's license. Although I request that you do not make use this code
+# in a proprietary program, I am not going to enforce this in court.
+
+"""
+This module contains the definition of a mitmproxy addon that gets instantiated
+from addon script.
+"""
+
+# Enable using with Python 3.7.
+from __future__ import annotations
+
+import os.path
+import typing as t
+import dataclasses as dc
+
+from threading import Lock
+from pathlib import Path
+from contextlib import contextmanager
+
+from mitmproxy import http, addonmanager, ctx
+from mitmproxy.script import concurrent
+
+from .flow_handlers import make_flow_handler, FlowHandler
+from .state import HaketiloState
+from ..translations import smart_gettext as _
+
+FlowHandlers = dict[int, FlowHandler]
+
+StateUpdater = t.Callable[[HaketiloState], None]
+
+HTTPHandlerFun = t.Callable[
+    ['HaketiloAddon', http.HTTPFlow],
+    t.Optional[StateUpdater]
+]
+
+def http_event_handler(handler_fun: HTTPHandlerFun):
+    """....decorator"""
+    def wrapped_handler(self: 'HaketiloAddon', flow: http.HTTPFlow):
+        """...."""
+        with self.configured_lock:
+            assert self.configured
+
+        assert self.state is not None
+
+        state_updater = handler_fun(self, flow)
+
+        if state_updater is not None:
+                state_updater(self.state)
+
+    return wrapped_handler
+
+@dc.dataclass
+class HaketiloAddon:
+    """
+    .......
+    """
+    configured:      bool                      = False
+    configured_lock: Lock                      = dc.field(default_factory=Lock)
+
+    state:           t.Optional[HaketiloState] = None
+
+    flow_handlers:   FlowHandlers              = dc.field(default_factory=dict)
+    handlers_lock:   Lock                      = dc.field(default_factory=Lock)
+
+    def load(self, loader: addonmanager.Loader) -> None:
+        """...."""
+        loader.add_option(
+            name     = 'haketilo_dir',
+            typespec = str,
+            default  = '~/.haketilo/',
+            help     = "Point to a Haketilo data directory to use",
+        )
+
+    def configure(self, updated: set[str]) -> None:
+        """...."""
+        if 'haketilo_dir' not in updated:
+            return
+
+        with self.configured_lock:
+            if self.configured:
+                ctx.log.warn(_('haketilo_dir_already_configured'))
+                return
+
+            haketilo_dir = Path(ctx.options.haketilo_dir)
+            self.state = HaketiloState(haketilo_dir / 'store')
+
+    def assign_handler(self, flow: http.HTTPFlow, flow_handler: FlowHandler) \
+        -> None:
+        """...."""
+        with self.handlers_lock:
+            self.flow_handlers[id(flow)] = flow_handler
+
+    def lookup_handler(self, flow: http.HTTPFlow) -> FlowHandler:
+        """...."""
+        with self.handlers_lock:
+            return self.flow_handlers[id(flow)]
+
+    def forget_handler(self, flow: http.HTTPFlow) -> None:
+        """...."""
+        with self.handlers_lock:
+            self.flow_handlers.pop(id(flow), None)
+
+    @concurrent
+    @http_event_handler
+    def requestheaders(self, flow: http.HTTPFlow) -> t.Optional[StateUpdater]:
+        """
+        .....
+        """
+        assert self.state is not None
+
+        policy = self.state.select_policy(flow.request.url)
+
+        flow_handler = make_flow_handler(flow, policy)
+
+        self.assign_handler(flow, flow_handler)
+
+        return flow_handler.on_requestheaders()
+
+    @concurrent
+    @http_event_handler
+    def request(self, flow: http.HTTPFlow) -> t.Optional[StateUpdater]:
+        """
+        ....
+        """
+        return self.lookup_handler(flow).on_request()
+
+    @concurrent
+    @http_event_handler
+    def responseheaders(self, flow: http.HTTPFlow) -> t.Optional[StateUpdater]:
+        """
+        ......
+        """
+        return self.lookup_handler(flow).on_responseheaders()
+
+    @concurrent
+    @http_event_handler
+    def response(self, flow: http.HTTPFlow) -> t.Optional[StateUpdater]:
+        """
+        ......
+        """
+        updater = self.lookup_handler(flow).on_response()
+
+        self.forget_handler(flow)
+
+        return updater
+
+    @http_event_handler
+    def error(self, flow: http.HTTPFlow) -> None:
+        """...."""
+        self.forget_handler(flow)
+
+addons = [
+    HaketiloAddon()
+]