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authorMaximilian Hils <git@maximilianhils.com>2016-02-15 14:58:46 +0100
committerMaximilian Hils <git@maximilianhils.com>2016-02-15 14:58:46 +0100
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-.. _inlinescripts:
-
-Inline Scripts
-==============
-
-**mitmproxy** has a powerful scripting API that allows you to modify flows
-on-the-fly or rewrite previously saved flows locally.
-
-The mitmproxy scripting API is event driven - a script is simply a Python
-module that exposes a set of event methods. Here's a complete mitmproxy script
-that adds a new header to every HTTP response before it is returned to the
-client:
-
-.. literalinclude:: ../../examples/add_header.py
- :caption: examples/add_header.py
- :language: python
-
-The first argument to each event method is an instance of
-:py:class:`~libmproxy.script.ScriptContext` that lets the script interact with the global mitmproxy
-state. The **response** event also gets an instance of :py:class:`~libmproxy.script.ScriptContext`,
-which we can use to manipulate the response itself.
-
-We can now run this script using mitmdump or mitmproxy as follows:
-
->>> mitmdump -s add_header.py
-
-The new header will be added to all responses passing through the proxy.
-
-Examples
---------
-
-mitmproxy comes with a variety of example inline scripts, which demonstrate many basic tasks.
-We encourage you to either browse them locally or on `GitHub`_.
-
-
-Events
-------
-
-The ``context`` argument passed to each event method is always a
-:py:class:`~libmproxy.script.ScriptContext` instance. It is guaranteed to be the same object
-for the scripts lifetime and is not shared between multiple inline scripts. You can safely use it
-to store any form of state you require.
-
-Script Lifecycle Events
-^^^^^^^^^^^^^^^^^^^^^^^
-
-.. py:function:: start(context, argv)
-
- Called once on startup, before any other events.
-
- :param List[str] argv: The inline scripts' arguments.
- For example, ``mitmproxy -s 'example.py --foo 42'`` sets argv to ``["--foo", "42"]``.
-
-.. py:function:: done(context)
-
- Called once on script shutdown, after any other events.
-
-Connection Events
-^^^^^^^^^^^^^^^^^
-
-.. py:function:: clientconnect(context, root_layer)
-
- Called when a client initiates a connection to the proxy. Note that
- a connection can correspond to multiple HTTP requests.
-
- .. versionchanged:: 0.14
-
- :param Layer root_layer: The root layer (see :ref:`protocols` for an explanation what the root
- layer is), which provides transparent access to all attributes of the
- :py:class:`~libmproxy.proxy.RootContext`. For example, ``root_layer.client_conn.address``
- gives the remote address of the connecting client.
-
-.. py:function:: clientdisconnect(context, root_layer)
-
- Called when a client disconnects from the proxy.
-
- .. versionchanged:: 0.14
-
- :param Layer root_layer: see :py:func:`clientconnect`
-
-.. py:function:: serverconnect(context, server_conn)
-
- Called before the proxy initiates a connection to the target server. Note that
- a connection can correspond to multiple HTTP requests.
-
- :param ServerConnection server_conn: The server connection object. It is guaranteed to have a
- non-None ``address`` attribute.
-
-.. py:function:: serverdisconnect(context, server_conn)
-
- Called when the proxy has closed the server connection.
-
- .. versionadded:: 0.14
-
- :param ServerConnection server_conn: see :py:func:`serverconnect`
-
-HTTP Events
-^^^^^^^^^^^
-
-.. py:function:: request(context, flow)
-
- Called when a client request has been received. The ``flow`` object is
- guaranteed to have a non-None ``request`` attribute.
-
- :param HTTPFlow flow: The flow containing the request which has been received.
- The object is guaranteed to have a non-None ``request`` attribute.
-
-.. py:function:: responseheaders(context, flow)
-
- Called when the headers of a server response have been received.
- This will always be called before the response hook.
-
- :param HTTPFlow flow: The flow containing the request and response.
- The object is guaranteed to have non-None ``request`` and
- ``response`` attributes. ``response.content`` will be ``None``,
- as the response body has not been read yet.
-
-.. py:function:: response(context, flow)
-
- Called when a server response has been received.
-
- :param HTTPFlow flow: The flow containing the request and response.
- The object is guaranteed to have non-None ``request`` and
- ``response`` attributes. ``response.body`` will contain the raw response body,
- unless response streaming has been enabled.
-
-.. py:function:: error(context, flow)
-
- Called when a flow error has occurred, e.g. invalid server responses, or
- interrupted connections. This is distinct from a valid server HTTP error
- response, which is simply a response with an HTTP error code.
-
- :param HTTPFlow flow: The flow containing the error.
- It is guaranteed to have non-None ``error`` attribute.
-
-TCP Events
-^^^^^^^^^^
-
-.. py:function:: tcp_message(context, tcp_msg)
-
- .. warning:: API is subject to change
-
- If the proxy is in :ref:`TCP mode <tcpproxy>`, this event is called when it
- receives a TCP payload from the client or server.
-
- The sender and receiver are identifiable. The message is user-modifiable.
-
- :param TcpMessage tcp_msg: see *examples/tcp_message.py*
-
-API
----
-
-The canonical API documentation is the code, which you can browse here, locally or on `GitHub`_.
-*Use the Source, Luke!*
-
-The main classes you will deal with in writing mitmproxy scripts are:
-
-:py:class:`~libmproxy.script.ScriptContext`
- - A handle for interacting with mitmproxy's Flow Master from within scripts.
-:py:class:`~libmproxy.models.ClientConnection`
- - Describes a client connection.
-:py:class:`~libmproxy.models.ServerConnection`
- - Describes a server connection.
-:py:class:`~libmproxy.models.HTTPFlow`
- - A collection of objects representing a single HTTP transaction.
-:py:class:`~libmproxy.models.HTTPRequest`
- - An HTTP request.
-:py:class:`~libmproxy.models.HTTPResponse`
- - An HTTP response.
-:py:class:`~libmproxy.models.Error`
- - A communications error.
-:py:class:`netlib.http.Headers`
- - A dictionary-like object for managing HTTP headers.
-:py:class:`netlib.certutils.SSLCert`
- - Exposes information SSL certificates.
-:py:class:`libmproxy.flow.FlowMaster`
- - The "heart" of libmproxy, usually subclassed as :py:class:`libmproxy.dump.DumpMaster` or
- :py:class:`libmproxy.console.ConsoleMaster`.
-
-Script Context
---------------
-
-.. autoclass:: libmproxy.script.ScriptContext
- :members:
- :undoc-members:
-
-Running scripts in parallel
----------------------------
-
-We have a single flow primitive, so when a script is blocking, other requests are not processed.
-While that's usually a very desirable behaviour, blocking scripts can be run threaded by using the
-:py:obj:`libmproxy.script.concurrent` decorator.
-**If your script does not block, you should avoid the overhead of the decorator.**
-
-.. literalinclude:: ../../examples/nonblocking.py
- :caption: examples/nonblocking.py
- :language: python
-
-Make scripts configurable with arguments
-----------------------------------------
-
-Sometimes, you want to pass runtime arguments to the inline script. This can be simply done by
-surrounding the script call with quotes, e.g. ```mitmdump -s 'script.py --foo 42'``.
-The arguments are then exposed in the start event:
-
-.. literalinclude:: ../../examples/modify_response_body.py
- :caption: examples/modify_response_body.py
- :language: python
-
-Running scripts on saved flows
-------------------------------
-
-Sometimes, we want to run a script on :py:class:`~libmproxy.models.Flow` objects that are already
-complete. This happens when you start a script, and then load a saved set of flows from a file
-(see the "scripted data transformation" example `here <https://mitmproxy.org/doc/mitmdump.html>`_).
-It also happens when you run a one-shot script on a single flow through the ``|`` (pipe) shortcut
-in mitmproxy.
-
-In this case, there are no client connections, and the events are run in the following order:
-**start**, **request**, **responseheaders**, **response**, **error**, **done**.
-If the flow doesn't have a **response** or **error** associated with it, the matching events will
-be skipped.
-
-Spaces in the script path
--------------------------
-
-By default, spaces are interpreted as a separator between the inline script and its arguments
-(e.g. ``-s 'foo.py 42'``). Consequently, the script path needs to be wrapped in a separate pair of
-quotes if it contains spaces: ``-s '\'./foo bar/baz.py\' 42'``.
-
-.. _GitHub: https://github.com/mitmproxy/mitmproxy