Mercurial > hg > TagInTheMiddle

annotate taginthemiddle/handlers.py @ 16:5f492a6fbdd1

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add note about URL structure
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 24 May 2010 07:28:39 -0700
parents 86118cd8912e
children c85d42296c06
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0
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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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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 TagCloud(GenshiHandler):
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69 template = 'cloud.html'
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70 methods = set(['GET'])
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71
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72 @classmethod
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73 def match(cls, app, request):
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74
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75 # check the method
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76 if request.method not in cls.methods:
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77 return None
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78
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79 # check the path
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80 if request.path_info.endswith('/%s' % app.tags_url):
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81 try:
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82 return cls(app, request)
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83 except HandlerMatchException:
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84 return None
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85
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86
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87 class ViewTags(GenshiHandler):
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88 """
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89 View for tags on a resource; for app.tags_url == 'tags':
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90
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91 /<resource>/tags/mozilla :
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92 all paths under /<resource> tagged with 'mozilla'
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93
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94 /<resource>/tags/mozilla+workflow :
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95 all paths under /<resource> tagged with 'mozilla' and 'workflow'
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96 (or should it be /<resource>/tags/mozilla/workflow , which would be
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97 identical to /<resource>/tags/workflow/mozilla ?)
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98
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99 Also handles RSS:
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100 /<resource>/tags/mozilla?format=rss
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101 """
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102
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103 template = 'tags.html'
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104 methods = set(['GET'])
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105
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106 def __init__(self, app, request):
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107 GenshiHandler.__init__(self, app, request)
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108 path = request.path_info.split('/')
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109 try:
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110 index = path.index(app.tags_url)
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111 except ValueError:
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112 raise HandlerMatchException
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113 self.tags = path[index+1:]
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114 if not self.tags:
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115 raise HandlerMatchException
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116 self.data['tags'] = self.tags
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117
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118 @classmethod
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119 def match(cls, app, request):
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120
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121 # check the method
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122 if request.method not in cls.methods:
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123 return None
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124
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125 try:
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126 return cls(app, request)
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127 except HandlerMatchException:
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128 return None
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129
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130 def Get(self):
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131 if self.request.GET.get('format') == 'rss':
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132 pass # TODO
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133 return GenshiHandler.Get(self)
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134
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135 class PostTags(Handler):
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136 methods = set(['POST'])
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137
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138 @classmethod
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139 def match(cls, app, request):
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140
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141 # check the method
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142 if request.method not in cls.methods:
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143 return None
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144
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145 # check auth
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146 if not request.remote_user:
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147 return None
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148
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149 # check the path
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150 if request.path_info.endswith('/%s' % app.post_url):
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151 try:
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152 return cls(app, request)
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153 except HandlerMatchException:
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154 return None
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155
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156 def __call__(self):
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157
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158 # get the url
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159 url = self.request.path_info.rsplit('/' + self.app.post_url, 1)[0]
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160
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161 # add and remove tags
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162 # TODO
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163
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164 # redirect to original resource
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165 return exc.HTTPSeeOther(location=url)
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166