"""
This plugin allows pyblosxom to process trackback
<http://www.sixapart.com/pronet/docs/trackback_spec> pings.  You must have the 
comments plugin installed as well, although you don't need to enable comments 
on your blog in order for trackbacks to work

%<---------------------------------------------------------
py['trackback_urltrigger'] = "/trackback"
%<---------------------------------------------------------

"""
import cgi, os, os.path
from Pyblosxom import tools

tb_good_response = """<?xml version="1.0" encoding="iso-8859-1"?>
<response>
<error>0</error>
</response>"""

tb_bad_response = """<?xml version="1.0" encoding="iso-8859-1"?>
<response>
<error>1</error>
<message>%s</message>
</response>"""

def cb_start(args):
    request = args["request"]
    config = request.getConfiguration()
    logdir = config.get("logdir", "/tmp")
    logfile = os.path.normpath(logdir + os.sep + "trackback.log")

    tools.make_logger(logfile)

def verify_installation(request):
    config = request.getConfiguration()
    retval = 1

    # all config properties are optional
    if not config.has_key('trackback_urltrigger'):
        print("missing optional property: 'trackback_urltrigger'")

    return retval

def cb_handle(args):
    """

    @param args: a dict of plugin arguments
    @type args: dict
    """
    request = args['request']
    pyhttp = request.getHttp()
    config = request.getConfiguration()

    urltrigger = config.get('trackback_urltrigger','/trackback')

    path_info = pyhttp['PATH_INFO']
    if path_info.startswith(urltrigger):
        response = request.getResponse()
        response.addHeader("Content-type", "text/xml")

        form = request.getForm()

        message = "A trackback must have at least a URL field (see http://www.sixapart.com/pronet/docs/trackback_spec )"

        if form.has_key("url"):
            import time
            cdict = { 'title': form.getvalue('title', ''), \
                      'author': 'Trackback from %s' % form.getvalue('blog_name', ''), \
                      'pubDate' : str(time.time()), \
                      'link' : form['url'].value, \
                      'source' : form.getvalue('blog_name', ''), \
                      'description' : form.getvalue('excerpt', '') }
            from Pyblosxom.entries.fileentry import FileEntry
            from Pyblosxom.pyblosxom import Request
            from Pyblosxom.pyblosxom import PyBlosxom

            datadir = config['datadir']

            from comments import writeComment    
            try:
                import os
                pi = path_info.replace(urltrigger,'')
                path = os.path.join(datadir, pi[1:])
                data = request.getData()
                ext = tools.what_ext(data['extensions'].keys(), path)
                entry = FileEntry(request, '%s.%s' % (path, ext), datadir )
                data = {}
                data['entry_list'] = [ entry ]
                writeComment(request, config, data, cdict, config['blog_encoding'])
                print >> response, tb_good_response
            except OSError:
                message = 'URI '+path_info+" doesn't exist"
                tools.log(message)
                print >> response, tb_bad_response % message

        else:
            tools.log(message)
            print >> response, tb_bad_response % message

        # no further handling is needed
        return 1
    else:
        return 0