Mercurial > hg > genshi_view

annotate genshi_view/template/+package+/handlers.py @ 21:807c8eef8098

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add a handler for tempita; should rename the package (at some point) template_view
author Jeff Hammel <jhammel@mozilla.com>
date Wed, 17 Nov 2010 11:02:33 -0800
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children
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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 pkg_resources import resource_filename
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8 from urlparse import urlparse
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9 from webob import Response, exc
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10 from tempita import HTMLTemplate
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12 class HandlerMatchException(Exception):
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13 """the handler doesn't match the request"""
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14
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15 class Handler(object):
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17 methods = set(['GET']) # methods to listen to
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18 handler_path = [] # path elements to match
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19
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20 @classmethod
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21 def match(cls, app, request):
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22
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23 # check the method
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24 if request.method not in cls.methods:
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25 return None
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26
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27 # check the path
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28 if request.environ['path'][:len(cls.handler_path)] != cls.handler_path:
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29 return None
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30
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31 try:
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32 return cls(app, request)
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33 except HandlerMatchException:
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34 return None
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35
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36 def __init__(self, app, request):
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37 self.app = app
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38 self.request = request
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39 self.application_path = urlparse(request.application_url)[2]
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40
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41 def link(self, path=(), permanant=False):
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42 if isinstance(path, basestring):
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43 path = [ path ]
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44 path = [ i.strip('/') for i in path ]
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45 if permanant:
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46 application_url = [ self.request.application_url ]
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47 else:
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48 application_url = [ self.application_path ]
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49 path = application_url + path
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50 return '/'.join(path)
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51
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52 def redirect(self, location):
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53 raise exc.HTTPSeeOther(location=location)
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55 class TempitaHandler(Handler):
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56
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57 template_dirs = [ resource_filename(__name__, 'templates') ]
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58
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59 def __init__(self, app, request):
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60 Handler.__init__(self, app, request)
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61 self.data = { 'request': request,
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62 'link': self.link }
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63
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64 def __call__(self):
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65 return getattr(self, self.request.method.title())()
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66
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67 def find_template(self, template):
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68 for d in self.template_dirs:
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69 path = os.path.join(d, template)
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70 if os.path.exists(path):
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71 return HTMLTemplate.from_filename(path)
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73 def Get(self):
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74 # needs to have self.template set
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75 template = self.find_template(self.template)
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76 return Response(content_type='text/html',
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77 body=template.substitute(**self.data))
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79
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80 class GenshiHandler(Handler):
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81
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82 def __init__(self, app, request):
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83 Handler.__init__(self, app, request)
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84 self.data = { 'request': request,
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85 'link': self.link }
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87 def __call__(self):
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88 return getattr(self, self.request.method.title())()
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89
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90 def Get(self):
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91 # needs to have self.template set
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92 template = self.app.loader.load(self.template)
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93 return Response(content_type='text/html',
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94 body=template.generate(**self.data).render('html'))
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98 class Index(GenshiHandler):
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99 template = 'index.html'
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100 methods=set(['GET', 'POST'])
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101
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102 def __init__(self, app, request):
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103 GenshiHandler.__init__(self, app, request)
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104
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105 def Get(self):
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106 self.data['name'] = self.request.remote_user or self.app.name
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107 return GenshiHandler.Get(self)
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108
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109 def Post(self):
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110 self.app.name = self.request.POST.get('name', self.app.name)
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111 self.redirect(self.link(self.handler_path))