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annotate decoupage/web.py @ 64:613ffeec2be5

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return exceptions rather than just raise them; needed for wsgiref and who knows what other servers
author Jeff Hammel <jhammel@mozilla.com>
date Wed, 15 Dec 2010 09:30:32 -0800
parents 9c570aed2246
children ac1dc088e37e
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1 """
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2 decoupage: a view with webob to index and serve static content
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3 """
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4
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5 import os
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6 import sys
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7
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8 from contenttransformer.app import FileTypeTransformer
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9 from contenttransformer.app import transformers
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af73a3fda723 add more metadata to files: modification time, type
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10 from datetime import datetime
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a328cc9d2c74 * fix formatters
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11 from formatters import formatters
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12 from genshi.builder import Markup
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13 from genshi.template import TemplateLoader
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14 from genshi.template.base import TemplateError
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15 from genshi.template.base import TemplateSyntaxError
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16 from martini.config import ConfigMunger
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041958c8c8f2 use paste.fileapp as the fileserver
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17 from paste.fileapp import FileApp
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18 from pkg_resources import iter_entry_points
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19 from pkg_resources import load_entry_point
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20 from pkg_resources import resource_filename
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21 from webob import Request, Response, exc
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22
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23 transformers = transformers()
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25 class Decoupage(object):
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27 ### class level variables
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28 defaults = { 'auto_reload': 'False',
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29 'configuration': None,
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30 'directory': None, # directory to serve
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31 'cascade': 'True', # whether to cascade configuration
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32 'template': 'index.html', # XXX see below
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33 'template_directories': '' # list of directories to look for templates
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34 }
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36 def __init__(self, **kw):
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38 # set defaults from app configuration
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39 for key in self.defaults:
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40 setattr(self, key, kw.get(key, self.defaults[key]))
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41
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42 # configure defaults
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43 assert self.directory, "Decoupage: directory not specified"
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44 self.auto_reload = self.auto_reload.lower() == 'true'
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45 self.cascade = self.cascade.lower() == 'true'
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46 self.directory = self.directory.rstrip(os.path.sep)
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47 assert os.path.isdir(self.directory)
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48 self.template_directories = self.template_directories.split() # no spaces in directory names, for now
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49
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50 for directory in self.template_directories:
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51 assert os.path.isdir(directory), "Decoupage template directory %s does not exist!" % directory
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53 # static file server
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54 self.fileserver = FileApp
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55
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56 # pluggable formats
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57 s = 'format.'
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58 _format_args = [ (i.split(s, 1)[-1], j) for i, j in kw.items()
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59 if i.startswith(s) ]
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60 format_args = {}
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61 for i, j in _format_args:
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62 assert i.count('.') == 1, 'Illegal string or something'
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63 format_name, var_name = i.split('.')
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64 format_args.setdefault(format_name, {})[var_name] = j
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65 self.formats = {}
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66 for _format in iter_entry_points('decoupage.formats'):
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67 try:
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68 _cls = _format.load()
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69 _instance = _cls(self, **format_args.get(_format.name, {}))
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70 except Exception, e:
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71 # record the error, but persist
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72 print >> sys.stderr, "Couldn't load format: %s" % _format
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73 print >> sys.stderr, e
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74 continue
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75 self.formats[_format.name] = _instance
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77 # pluggable index data formatters
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78 self.formatters = {}
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79 for formatter in iter_entry_points('decoupage.formatters'):
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80 try:
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81 _formatter = formatter.load()
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82 template_dir = resource_filename(formatter.module_name, 'templates')
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83 if template_dir not in self.template_directories and os.path.isdir(template_dir):
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84 self.template_directories.append(template_dir)
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85 except Exception, e:
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86 # record the error, but persist
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87 print >> sys.stderr, "Couldn't load formatter: %s" % formatter
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88 print >> sts.stderr, e
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89 continue
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90 self.formatters[formatter.name] = _formatter
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92 # template loader
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93 self.loader = TemplateLoader(self.template_directories,
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94 auto_reload=self.auto_reload)
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95
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97
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98 ### methods dealing with HTTP
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99
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100 def __call__(self, environ, start_response):
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101
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102 # boilerplate: request and filename
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103 request = Request(environ)
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104 filename = request.path_info.strip('/')
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105 path = os.path.join(self.directory, filename)
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106
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107 # check to see what we have to serve
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108 if os.path.exists(path):
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109
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110 if os.path.isdir(path):
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111 # serve an index
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112 if request.path_info.endswith('/'):
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113 res = self.get(request)
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114 else:
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115 res = exc.HTTPMovedPermanently(add_slash=True)
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116 return res(environ, start_response)
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118 else:
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119 # serve a file
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120 conf = self.conf(request.path_info.rsplit('/',1)[0])
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121 if '/transformer' in conf:
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122 args = [i.split('=', 1) for i in conf['/transformer'].split(',') if '=' in i]
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123 kwargs = {}
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124 for i in conf:
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125 if i.startswith('/'):
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126 name = i[1:]
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127 if name in transformers:
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128 kwargs[name] = dict([j.split('=', 1) for j in conf[i].split(',') if '=' in j])
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129 fileserver = FileTypeTransformer(*args, **kwargs)
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130 else:
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131 fileserver = self.fileserver
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132
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133 fileserver = fileserver(path)
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134 return fileserver(environ, start_response)
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135 else:
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136 # file does not exist
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137 response = exc.HTTPNotFound()
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138 return response(environ, start_response)
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139
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140
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141 def get(self, request):
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142 """
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143 return response to a GET requst
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144 """
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145
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146 # ensure a sane path
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147 path = request.path_info.strip('/')
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148 directory = os.path.join(self.directory, path)
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149 path = '/%s' % path
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150
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151 # get the configuraton
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152 conf = self.conf(path)
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153
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154 ### build data dictionary
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155 # TODO: separate these out into several formatters
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156 files = self.filedata(path, directory, conf)
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157 data = {'path': path, 'files': files, 'request': request }
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158
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159 # defaults; TODO: make this better
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160 # there shouldn't need to be defaults;
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161 # iirc, genshi has a mode where these will default to None
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162 data['title'] = conf.get('/title')
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163 data['directory'] = directory
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164 data['include'] = None
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165 data['css'] = ()
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166 data['scripts'] = ()
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167 data['icon'] = None
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168
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169 # apply formatters
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170 # XXX this should be cached if not self.auto_reload
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171 if '/formatters' in conf:
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172 # ordered list of formatters to be applied first
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173 formatters = [ i for i in conf['/formatters'].split()
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174 if i in self.formatters ]
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175 else:
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176 formatters = []
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177 for key in conf:
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178 if key.startswith('/'):
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179 key = key[1:]
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180 if key in self.formatters and key not in formatters:
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181 formatters.append(key)
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182 for name in formatters:
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183 formatter = self.formatters[name](conf.get('/%s' % name, ''))
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184 formatter(request, data)
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185
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186 # return an alternate format if specified
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187 # decoupage.formats should return a 2-tuple:
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188 # (content_type, body)
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189 if 'format' in request.GET:
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190 format_name = request.GET['format']
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191 if format_name in self.formats:
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192 _format = self.formats[format_name]
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193 content_type, body = _format(request, data)
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194 return Response(content_type=content_type, body=body)
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195
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196 # render the template
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197 template = conf.get('/template')
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198 local_index = False
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199 if template is None:
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200 if 'index.html' in [ f['name'] for f in files ]:
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201 local_index = os.path.join(directory, 'index.html')
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202 template = local_index
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203 else:
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204 template = self.template
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205 else:
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206 if not os.path.isabs(template):
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207 _template = os.path.join(directory, template)
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208 if os.path.exists(_template):
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209 template = _template
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210 else:
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211 for directory in self.template_directories:
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212 if template in os.listdir(directory):
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213 break
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214 else:
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215 raise IOError("template %s not found" % template)
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216 try:
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217 template = self.loader.load(template)
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218 res = template.generate(**data).render('html', doctype='html')
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219 except (TemplateError, TemplateSyntaxError), e:
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220 if local_index:
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221 print repr(e)
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222 return self.fileserver(local_index)
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223 raise
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224
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225 # return response
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226 return Response(content_type='text/html', body=res)
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227
0
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228
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229 ### internal methods
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230
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231 def filedata(self, path, directory, conf=None):
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232 conf = conf or {}
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233 files = []
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234
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235 # get data for files
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236 filenames = os.listdir(directory)
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237 for i in filenames:
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238 filepath = os.path.join(directory, i)
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239 filetype = 'file'
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240 if os.path.isdir(filepath):
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241 filetype = 'directory'
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242 modified = os.path.getmtime(filepath)
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243 modified = datetime.fromtimestamp(modified)
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244 data = {'path' : '%s/%s' % (path.rstrip('/'), i),
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245 'name': i,
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246 'modified': modified,
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247 'type': filetype}
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248 if filetype == 'file':
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249 data['size'] = os.path.getsize(filepath)
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250 files.append(data)
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251
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252 # TODO: deal with other links in conf
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253 for i in conf:
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254 if i in filenames or i.startswith('/'):
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255 continue
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256 if i.startswith('http://') or i.startswith('https://'):
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257 files.append({'path': i,
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258 'name': i,
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259 'type': link})
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260
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261 for f in files:
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262 f['description'] = conf.get(f['name'], None)
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263
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264 return files
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265
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266 def conf(self, path, cascade=None):
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267 """returns configuration dictionary appropriate to a path"""
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268 if cascade is None:
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269 cascase = self.cascade
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270
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271 directory = os.path.join(self.directory, path.strip('/'))
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272 if path.strip('/'):
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273 path_tuple = tuple(path.strip('/').split('/'))
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274 else:
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275 path_tuple = ()
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276
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277 # return cached configuration
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278 if hasattr(self, '_conf') and path_tuple in self._conf:
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279 return self._conf[path_tuple]
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280
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281 conf = {}
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282
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283 # local configuration
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284 ini_path = os.path.join(directory, 'index.ini')
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285 if os.path.exists(ini_path):
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286 _conf = ConfigMunger(ini_path).dict()
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287 if len(_conf) == 1:
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288 conf = _conf[_conf.keys()[0]].copy()
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289
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290 # global configuration
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291 if not conf and self.configuration and os.path.exists(self.configuration):
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292 conf = ConfigMunger(self.configuration).dict().get('/%s' % path.rstrip('/'), {})
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293
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294 # inherit and cascade configuration
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295 inherit_directory = None
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296 if '/inherit' in conf:
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297 inherit_directory = conf['/inherit']
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298 elif self.cascade and path_tuple:
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299 inherit_directory = '/%s' % '/'.join(path_tuple[:-1])
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300 if inherit_directory:
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301 parent_configuration = self.conf(inherit_directory)
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302 for key, value in parent_configuration.items():
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303 if key.startswith('/') and key not in conf:
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304 conf[key] = value
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305
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306 # cache configuration
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307 if not self.auto_reload:
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308 if not hasattr(self, '_conf'):
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309 self._conf = {}
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310 self._conf[path_tuple] = conf
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311
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312 return conf
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313
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314 def fmtrs(self, path):
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315 formatters = []
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316 for key, value in self.conf(path).items():
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317 if key.startswith('/'):
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318 key = key[1:]
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319 if key in self.formatters:
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320 formatter = self.formatters[key](value)
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321