Mercurial > hg > decoupage
annotate decoupage/web.py @ 96:21273cdb2047
minor polish
author | Jeff Hammel <k0scist@gmail.com> |
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date | Sun, 21 Aug 2016 19:46:00 -0700 |
parents | c5895d87c65e |
children | abf23c2e4e82 |
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1 """ |
87 | 2 decoupage: a dynamic file server |
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3 """ |
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4 |
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5 # TODO: |
92 | 6 |
82 | 7 # handle files with `#`s like like `#index.ini` |
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8 # -> http://k0s.org/portfolio/ideas/#index.ini# |
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9 # |
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10 # oops. Handle it better |
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11 # - either # is a magic hide character |
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12 # - or you urlescape that guy |
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13 |
92 | 14 # OrderedDict |
15 | |
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16 import os |
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17 import sys |
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18 |
92 | 19 from collections import OrderedDict |
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20 from contenttransformer.app import FileTypeTransformer |
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21 from contenttransformer.app import transformers |
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22 from datetime import datetime |
10 | 23 from formatters import formatters |
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24 from genshi.builder import Markup |
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25 from genshi.template import TemplateLoader |
21 | 26 from genshi.template.base import TemplateError |
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27 from genshi.template.base import TemplateSyntaxError |
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28 from martini.config import ConfigMunger |
2 | 29 from paste.fileapp import FileApp |
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30 from pkg_resources import iter_entry_points |
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31 from pkg_resources import load_entry_point |
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32 from pkg_resources import resource_filename |
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33 from webob import Request, Response, exc |
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34 |
61 | 35 transformers = transformers() |
84 | 36 string = (str, unicode) |
37 | |
96 | 38 |
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39 class Decoupage(object): |
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40 |
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41 ### class level variables |
84 | 42 defaults = { 'auto_reload': False, |
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43 'configuration': None, |
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44 'directory': None, # directory to serve |
84 | 45 'cascade': True, # whether to cascade configuration |
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46 'template': 'index.html', # XXX see below |
82 | 47 'template_directories': '', # list of directories to look for templates |
48 'charset': 'utf-8', # content encoding for index.html files; -> `Content-Type: text/html; charset=ISO-8859-1` | |
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49 } |
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50 |
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51 def __init__(self, **kw): |
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52 |
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53 # set defaults from app configuration |
84 | 54 for key, default_value in self.defaults.items(): |
55 | |
56 value = kw.get(key, default_value) | |
57 | |
58 # handle non-string bools | |
59 if isinstance(default_value, bool) and isinstance(value, string): | |
60 value = {'true': True, | |
61 'false': False}[value.lower()] | |
62 # TODO: error handling for bad strings | |
63 | |
64 setattr(self, key, value) | |
65 | |
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66 |
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67 # configure defaults |
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68 assert self.directory, "Decoupage: directory not specified" |
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69 self.directory = self.directory.rstrip(os.path.sep) |
75 | 70 assert os.path.isdir(self.directory), "'%s' is not a directory" % self.directory |
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71 self.template_directories = self.template_directories.split() # no spaces in directory names, for now |
30 | 72 |
73 for directory in self.template_directories: | |
74 assert os.path.isdir(directory), "Decoupage template directory %s does not exist!" % directory | |
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75 |
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76 # static file server |
61 | 77 self.fileserver = FileApp |
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78 |
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79 # pluggable formats |
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80 s = 'format.' |
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81 _format_args = [ (i.split(s, 1)[-1], j) for i, j in kw.items() |
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82 if i.startswith(s) ] |
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83 format_args = {} |
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84 for i, j in _format_args: |
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85 assert i.count('.') == 1, 'Illegal string or something' |
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86 format_name, var_name = i.split('.') |
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87 format_args.setdefault(format_name, {})[var_name] = j |
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88 self.formats = {} |
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89 for _format in iter_entry_points('decoupage.formats'): |
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90 try: |
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91 _cls = _format.load() |
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92 _instance = _cls(self, **format_args.get(_format.name, {})) |
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93 except Exception, e: |
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94 # record the error, but persist |
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95 print >> sys.stderr, "Couldn't load format: %s" % _format |
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96 print >> sys.stderr, e |
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97 continue |
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98 self.formats[_format.name] = _instance |
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99 |
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100 # pluggable index data formatters |
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101 self.formatters = {} |
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102 for formatter in iter_entry_points('decoupage.formatters'): |
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103 try: |
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104 _formatter = formatter.load() |
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105 template_dir = resource_filename(formatter.module_name, 'templates') |
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106 if template_dir not in self.template_directories and os.path.isdir(template_dir): |
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107 self.template_directories.append(template_dir) |
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108 except Exception, e: |
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109 # record the error, but persist |
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110 print >> sys.stderr, "Couldn't load formatter: %s" % formatter |
74 | 111 print >> sys.stderr, e |
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112 continue |
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113 self.formatters[formatter.name] = _formatter |
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114 |
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115 # template loader |
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116 self.loader = TemplateLoader(self.template_directories, |
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117 variable_lookup="lenient", |
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118 auto_reload=self.auto_reload) |
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119 |
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120 |
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121 ### methods dealing with HTTP |
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122 |
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123 def __call__(self, environ, start_response): |
96 | 124 """WSGI application""" |
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125 |
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126 # boilerplate: request and filename |
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127 request = Request(environ) |
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128 filename = request.path_info.strip('/') |
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129 path = os.path.join(self.directory, filename) |
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130 |
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131 # check to see what we have to serve |
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132 if os.path.exists(path): |
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133 |
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134 if os.path.isdir(path): |
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135 # serve an index |
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136 if request.path_info.endswith('/'): |
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137 res = self.get(request) |
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138 else: |
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139 res = exc.HTTPMovedPermanently(add_slash=True) |
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140 return res(environ, start_response) |
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141 |
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142 else: |
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143 # serve a file |
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144 conf = self.conf(request.path_info.rsplit('/',1)[0]) |
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145 if '/transformer' in conf: |
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146 args = [i.split('=', 1) for i in conf['/transformer'].split(',') if '=' in i] |
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147 kwargs = {} |
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148 for i in conf: |
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149 if i.startswith('/'): |
61 | 150 name = i[1:] |
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151 if name in transformers: |
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152 kwargs[name] = dict([j.split('=', 1) for j in conf[i].split(',') if '=' in j]) |
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153 fileserver = FileTypeTransformer(*args, **kwargs) |
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154 else: |
61 | 155 fileserver = self.fileserver |
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156 |
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157 fileserver = fileserver(path) |
2 | 158 return fileserver(environ, start_response) |
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159 else: |
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160 # file does not exist |
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161 conf = self.conf('/') |
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162 data = dict(request=request, |
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163 title="Not Found") |
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164 template = self.loader.load('HTTPNotFound.html') |
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165 body = template.generate(**data).render('html', doctype='html') |
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166 response = Response(content_type='text/html', body=body, status=404) |
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167 return response(environ, start_response) |
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168 |
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169 |
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170 def get(self, request): |
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171 """ |
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172 return response to a GET requst |
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173 """ |
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174 |
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175 # ensure a sane path |
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176 path = request.path_info.strip('/') |
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177 directory = os.path.join(self.directory, path) |
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178 path = '/%s' % path |
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179 |
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180 # get the configuraton |
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181 conf = self.conf(path) |
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182 |
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183 ### build data dictionary |
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184 # TODO: separate these out into several formatters |
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185 files = self.filedata(path, directory, conf) |
96 | 186 data = {'path': path, 'files': files, 'request': request} |
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187 |
65 | 188 # add a function to get the path to files |
189 data['filepath'] = lambda *segments: os.path.join(*([directory] + list(segments))) | |
190 | |
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191 # defaults |
15 | 192 data['directory'] = directory |
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193 data['css'] = () |
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194 data['scripts'] = () |
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195 |
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196 # apply formatters |
85 | 197 formatters = self.get_formatters(path) |
198 for formatter in formatters: | |
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199 formatter(request, data) |
10 | 200 |
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201 # return an alternate format if specified |
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202 # decoupage.formats should return a 2-tuple: |
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203 # (content_type, body) |
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204 if 'format' in request.GET: |
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205 format_name = request.GET['format'] |
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206 if format_name in self.formats: |
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207 _format = self.formats[format_name] |
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208 content_type, body = _format(request, data) |
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209 return Response(content_type=content_type, body=body) |
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210 |
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211 # render the template |
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212 template = conf.get('/template') |
69 | 213 local_index = False |
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214 if template is None: |
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215 if 'index.html' in [ f['name'] for f in files ]: |
20 | 216 local_index = os.path.join(directory, 'index.html') |
217 template = local_index | |
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218 else: |
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219 template = self.template |
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220 else: |
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221 if not os.path.isabs(template): |
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222 _template = os.path.join(directory, template) |
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223 if os.path.exists(_template): |
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224 template = _template |
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225 else: |
65 | 226 for _directory in self.template_directories: |
227 if template in os.listdir(_directory): | |
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228 break |
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229 else: |
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230 raise IOError("template %s not found" % template) |
20 | 231 try: |
21 | 232 template = self.loader.load(template) |
20 | 233 res = template.generate(**data).render('html', doctype='html') |
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234 except (TemplateError, TemplateSyntaxError), e: |
20 | 235 if local_index: |
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236 print repr(e) |
20 | 237 return self.fileserver(local_index) |
238 raise | |
239 | |
82 | 240 # set charset if given |
241 kw = {} | |
242 if self.charset: | |
243 kw['charset'] = self.charset | |
244 | |
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245 # return response |
82 | 246 return Response(content_type='text/html', body=res, **kw) |
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247 |
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248 |
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249 ### internal methods |
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250 |
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251 def filedata(self, path, directory, conf=None): |
92 | 252 conf = conf or OrderedDict() |
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253 files = [] |
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254 |
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255 # get data for files |
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256 filenames = os.listdir(directory) |
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257 for i in filenames: |
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258 filepath = os.path.join(directory, i) |
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259 filetype = 'file' |
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260 if os.path.isdir(filepath): |
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261 filetype = 'directory' |
76 | 262 try: |
263 modified = os.path.getmtime(filepath) | |
264 except OSError: | |
265 # the file (mysteriously) may not exist by this time(!) | |
266 # File "/home/jhammel/web/src/decoupage/decoupage/web.py", line 114, in __call__ | |
267 # res = self.get(request) | |
268 # File "/home/jhammel/web/src/decoupage/decoupage/web.py", line 162, in get | |
269 # files = self.filedata(path, directory, conf) | |
270 # File "/home/jhammel/web/src/decoupage/decoupage/web.py", line 246, in filedata | |
271 # modified = os.path.getmtime(filepath) | |
272 # File "/home/jhammel/web/lib/python2.6/genericpath.py", line 54, in getmtime | |
273 # return os.stat(filename).st_mtime | |
274 # OSError: [Errno 2] No such file or directory: '/home/jhammel/web/site/portfolio/ideas/.#index.ini' | |
275 continue # wt{h,f}??? | |
276 | |
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277 modified = datetime.fromtimestamp(modified) |
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278 data = {'path' : '%s/%s' % (path.rstrip('/'), i), |
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279 'name': i, |
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280 'modified': modified, |
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281 'type': filetype} |
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282 if filetype == 'file': |
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283 data['size'] = os.path.getsize(filepath) |
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284 files.append(data) |
69 | 285 |
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286 # TODO: deal with other links in conf |
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287 for i in conf: |
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288 if i in filenames or i.startswith('/'): |
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289 continue |
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290 if i.startswith('http://') or i.startswith('https://'): |
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291 files.append({'path': i, |
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292 'name': i, |
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293 'type': link}) |
69 | 294 |
52
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295 for f in files: |
61 | 296 f['description'] = conf.get(f['name'], None) |
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297 |
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298 return files |
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299 |
10 | 300 def conf(self, path, cascade=None): |
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301 """returns configuration dictionary appropriate to a path""" |
10 | 302 if cascade is None: |
303 cascase = self.cascade | |
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304 |
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305 directory = os.path.join(self.directory, path.strip('/')) |
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306 if path.strip('/'): |
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307 path_tuple = tuple(path.strip('/').split('/')) |
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308 else: |
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309 path_tuple = () |
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310 |
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311 # return cached configuration |
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312 if hasattr(self, '_conf') and path_tuple in self._conf: |
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313 return self._conf[path_tuple] |
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314 |
92 | 315 conf = OrderedDict() |
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316 |
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317 # local configuration |
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318 ini_path = os.path.join(directory, 'index.ini') |
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319 if os.path.exists(ini_path): |
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320 _conf = ConfigMunger(ini_path).dict() |
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321 if len(_conf) == 1: |
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322 conf = _conf[_conf.keys()[0]].copy() |
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323 |
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324 # global configuration |
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325 if not conf and self.configuration and os.path.exists(self.configuration): |
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326 conf = ConfigMunger(self.configuration).dict().get('/%s' % path.rstrip('/'), {}) |
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327 |
10 | 328 # inherit and cascade configuration |
329 inherit_directory = None | |
330 if '/inherit' in conf: | |
331 inherit_directory = conf['/inherit'] | |
332 elif self.cascade and path_tuple: | |
333 inherit_directory = '/%s' % '/'.join(path_tuple[:-1]) | |
334 if inherit_directory: | |
335 parent_configuration = self.conf(inherit_directory) | |
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336 for key, value in parent_configuration.items(): |
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337 if key.startswith('/') and key not in conf: |
69 | 338 conf[key] = value |
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339 |
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340 # cache configuration |
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341 if not self.auto_reload: |
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342 if not hasattr(self, '_conf'): |
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343 self._conf = {} |
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344 self._conf[path_tuple] = conf |
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345 |
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346 return conf |
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347 |
85 | 348 def get_formatters(self, path): |
349 """return formatters for a path""" | |
350 retval = [] | |
351 conf = self.conf(path) | |
352 # apply formatters | |
353 # XXX this should be cached if not self.auto_reload | |
354 if '/formatters' in conf: | |
355 # ordered list of formatters to be applied first | |
356 formatters = [ i for i in conf['/formatters'].split() | |
357 if i in self.formatters ] | |
358 else: | |
359 formatters = [] | |
360 for key in conf: | |
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361 if key.startswith('/'): |
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362 key = key[1:] |
85 | 363 if key in self.formatters and key not in formatters: |
364 formatters.append(key) | |
365 for name in formatters: | |
366 retval.append(self.formatters[name](conf.get('/%s' % name, ''))) | |
89 | 367 return retval |