new file mode 100644
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+++ b/bitten/api.py
@@ -0,0 +1,106 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2005-2007 Christopher Lenz <cmlenz@gmx.de>
+# Copyright (C) 2007 Edgewall Software
+# All rights reserved.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at http://bitten.edgewall.org/wiki/License.
+
+"""Interfaces of extension points provided by the Bitten Trac plugin."""
+
+from trac.core import *
+
+
+class IBuildListener(Interface):
+    """Extension point interface for components that need to be notified of
+    build events.
+    
+    Note that these will be notified in the process running the build master,
+    not the web interface.
+    """
+
+    def build_started(build):
+        """Called when a build slave has accepted a build initiation.
+        
+        @param build: the build that was started
+        @type build: an instance of L{bitten.model.Build}
+        """
+
+    def build_aborted(build):
+        """Called when a build slave cancels a build or disconnects.
+        
+        @param build: the build that was aborted
+        @type build: an instance of L{bitten.model.Build}
+        """
+
+    def build_completed(build):
+        """Called when a build slave has completed a build, regardless of the
+        outcome.
+        
+        @param build: the build that was aborted
+        @type build: an instance of L{bitten.model.Build}
+        """
+
+
+class ILogFormatter(Interface):
+    """Extension point interface for components that format build log
+    messages."""
+
+    def get_formatter(req, build):
+        """Return a function that gets called for every log message.
+        
+        The function must take four positional arguments, C{step},
+        C{generator}, C{level} and C{message}, and return the formatted
+        message as a string.
+
+        @param req: the request object
+        @param build: the build to which the logs belong that should be
+            formatted
+        @type build: an instance of L{bitten.model.Build}
+        """
+
+
+class IReportSummarizer(Interface):
+    """Extension point interface for components that render a summary of reports
+    of some kind."""
+
+    def get_supported_categories():
+        """Return a list of strings identifying the types of reports this 
+        component supports."""
+
+    def render_summary(req, config, build, step, category):
+        """Render a summary for the given report and return the resulting HTML
+        as string.
+        
+        @param req: the request object
+        @param config: the build configuration
+        @type config: an instance of L{bitten.model.BuildConfig}
+        @param build: the build
+        @type build: an instance of L{bitten.model.Build}
+        @param step: the build step
+        @type step: an instance of L{bitten.model.BuildStep}
+        @param category: the category of the report that should be summarized
+        """
+
+
+class IReportChartGenerator(Interface):
+    """Extension point interface for components that generator a chart for a
+    set of reports."""
+
+    def get_supported_categories():
+        """Return a list of strings identifying the types of reports this 
+        component supports."""
+
+    def generate_chart_data(req, config, category):
+        """Generate the data for a report chart.
+        
+        This method should store the data in the HDF of the request and return
+        the name of the template that should process the data.
+        
+        @param req: the request object
+        @param config: the build configuration
+        @type config: an instance of L{bitten.model.BuildConfig}
+        @param category: the category of reports to include in the chart
+        """