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1 """
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2 request handlers:
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3 these are instantiated for every request, then called
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4 """
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5
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6 from urlparse import urlparse
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7 from webob import Response, exc
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8
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9 class HandlerMatchException(Exception):
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10 """the handler doesn't match the request"""
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11
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12 class Handler(object):
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13
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14 methods = set(['GET']) # methods to listen to
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15 handler_path = [] # path elements to match
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16
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17 @classmethod
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18 def match(cls, app, request):
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19
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20 # check the method
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21 if request.method not in cls.methods:
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22 return None
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23
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24 # check the path
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25 if request.environ['path'][:len(cls.handler_path)] != cls.handler_path:
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26 return None
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27
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28 try:
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29 return cls(app, request)
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30 except HandlerMatchException:
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31 return None
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32
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33 def __init__(self, app, request):
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34 self.app = app
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35 self.request = request
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36 self.application_path = urlparse(request.application_url)[2]
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37
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38 def link(self, path=(), permanant=False):
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39 if isinstance(path, basestring):
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40 path = [ path ]
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41 path = [ i.strip('/') for i in path ]
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42 if permanant:
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43 application_url = [ self.request.application_url ]
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44 else:
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45 application_url = [ self.application_path ]
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46 path = application_url + path
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47 return '/'.join(path)
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48
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49 def redirect(self, location):
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50 raise exc.HTTPSeeOther(location=location)
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51
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52 class GenshiHandler(Handler):
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53
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54 def __init__(self, app, request):
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55 Handler.__init__(self, app, request)
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56 self.data = { 'request': request,
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57 'link': self.link }
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58
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59 def __call__(self):
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60 return getattr(self, self.request.method.title())()
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61
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62 def Get(self):
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63 # needs to have self.template set
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64 template = self.app.loader.load(self.template)
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65 return Response(content_type='text/html',
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66 body=template.generate(**self.data).render('html'))
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67
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68 class Discussions(GenshiHandler):
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69 """
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70 ?format=json,mbox,rss,text,snippet
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71 """
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72
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73 template = 'index.html'
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74 methods=set(['GET', 'POST'])
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75
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76 def __init__(self, app, request):
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77 GenshiHandler.__init__(self, app, request)
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78
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79 def Get(self):
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80 self.data['name'] = self.request.remote_user or self.app.name
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81 return GenshiHandler.Get(self)
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82
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83 def Post(self):
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84 self.app.name = self.request.POST.get('name', self.app.name)
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85 self.redirect(self.link(self.handler_path))
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