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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 import os
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7 from urlparse import urlparse
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8 from webob import Response, exc
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9
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10 class HandlerMatchException(Exception):
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11 """the handler doesn't match the request"""
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12
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13 class Handler(object):
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14
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15 methods = set(['GET']) # methods to listen to
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16 handler_path = [] # path elements to match
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17
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18 @classmethod
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19 def match(cls, app, request):
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20
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21 # check the method
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22 if request.method not in cls.methods:
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23 return None
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24
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25 # check the path
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26 if request.environ['path'][:len(cls.handler_path)] != cls.handler_path:
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27 return None
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28
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29 try:
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30 return cls(app, request)
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31 except HandlerMatchException:
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32 return None
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33
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34 def __init__(self, app, request):
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35 self.app = app
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36 self.request = request
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37 self.application_path = urlparse(request.application_url)[2]
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38
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39 def link(self, path=(), permanant=False):
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40 if isinstance(path, basestring):
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41 path = [ path ]
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42 path = [ i.strip('/') for i in path ]
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43 if permanant:
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44 application_url = [ self.request.application_url ]
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45 else:
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46 application_url = [ self.application_path ]
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47 path = application_url + path
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48 return '/'.join(path)
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49
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50 def redirect(self, location):
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51 raise exc.HTTPSeeOther(location=location)
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52
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53 class GenshiRenderer(Handler):
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54
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55 @classmethod
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56 def match(cls, app, request):
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57
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58 # check the method
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59 if request.method not in cls.methods:
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60 return None
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61
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62 # check the path
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63 path = request.environ['path']
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64 if not path:
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65 return None
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66 if not path[-1].endswith('.html'):
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67 return None
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68
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69
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70 try:
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71 return cls(app, request)
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72 except HandlerMatchException:
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73 return None
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74
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75 def __init__(self, app, request):
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76 Handler.__init__(self, app, request)
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77 self.template = os.path.join(app.directory, *request.environ['path'])
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78 if not os.path.exists(self.template):
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79 raise HandlerMatchException
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80 self.data = { 'request': request,
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81 'link': self.link }
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82
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83 def __call__(self):
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84 return getattr(self, self.request.method.title())()
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85
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86 def Get(self):
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87 # needs to have self.template set
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88 template = self.app.loader.load(self.template)
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89 return Response(content_type='text/html',
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90 body=template.generate(**self.data).render('html'))
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91
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