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authorAldo Cortesi <aldo@nullcube.com>2012-09-16 15:35:58 +1200
committerAldo Cortesi <aldo@nullcube.com>2012-09-16 15:35:58 +1200
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+
+__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:
+
+$!example("examples/add_header.py")!$
+
+The first argument to each event method is an instance of ScriptContext that
+lets the script interact with the global mitmproxy state. The __response__
+event also gets an instance of Flow, which we can use to manipulate the
+response itself.
+
+
+## Events
+
+### start(ScriptContext)
+
+Called once on startup, before any other events.
+
+
+###clientconnect(ScriptContext, ClientConnect)
+
+Called when a client initiates a connection to the proxy. Note that
+a connection can correspond to multiple HTTP requests.
+
+
+###request(ScriptContext, Flow)
+
+Called when a client request has been received. The __Flow__ object is
+guaranteed to have a non-None __request__ attribute.
+
+
+### response(ScriptContext, Flow)
+
+Called when a server response has been received. The __Flow__ object is
+guaranteed to have non-None __request__ and __response__ attributes.
+
+
+### error(ScriptContext, 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. The __Flow__
+object is guaranteed to have non-None __request__ and __error__ attributes.
+
+
+### clientdisconnect(ScriptContext, ClientDisconnect)
+
+Called when a client disconnects from the proxy.
+
+### done(ScriptContext)
+
+Called once on script shutdown, after any other events.
+
+
+## API
+
+The main classes you will deal with in writing mitmproxy scripts are:
+
+<table class="kvtable">
+ <tr>
+ <th>libmproxy.flow.ClientConnection</th>
+ <td>Describes a client connection.</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.ClientDisconnection</th>
+ <td>Describes a client disconnection.</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.Error</th>
+ <td>A communications error.</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.Flow</th>
+ <td>A collection of objects representing a single HTTP transaction.</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.Headers</th>
+ <td>HTTP headers for a request or response.</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.ODict</th>
+
+ <td>A dictionary-like object for managing sets of key/value data. There
+ is also a variant called CaselessODict that ignores key case for some
+ calls (used mainly for headers).</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.Response</th>
+ <td>An HTTP response.</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.Request</th>
+ <td>An HTTP request.</td>
+ </tr>
+ <tr>
+ <th>libmproxy.flow.ScriptContext</th>
+ <td> A handle for interacting with mitmproxy's from within scripts. </td>
+ </tr>
+ <tr>
+ <th>libmproxy.certutils.SSLCert</th>
+ <td>Exposes information SSL certificates.</td>
+ </tr>
+</table>
+
+The canonical API documentation is the code. You can view the API documentation
+using pydoc (which is installed with Python by default), like this:
+
+<pre class="terminal">
+> pydoc libmproxy.flow.Request
+</pre>
+
+
+## Running scripts on saved flows
+
+Sometimes, we want to run a script on __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 on the
+[mitmdump](@!urlTo("mitmdump.html")!@) page). 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__, __response__, __error__, __done__. If
+the flow doesn't have a __response__ or __error__ associated with it, the
+matching event will be skipped.