author | Tero Marttila <terom@fixme.fi> |
Fri, 06 Feb 2009 22:48:00 +0200 | |
changeset 8 | 0ce1f471e9d7 |
parent 7 | d6a8258bd90e |
child 9 | 2a47b00f60b0 |
permissions | -rw-r--r-- |
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""" |
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Handling page requests |
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""" |
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# for filesystem ops |
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import os, os.path |
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# for ResponseError |
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import http |
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# for TemplatePage |
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import template |
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# path to directory containing the page heirarcy |
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PAGE_DIR = "pages" |
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class PageError (http.ResponseError) : |
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""" |
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Error looking up/handling a page |
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""" |
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|
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pass |
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class Page (object) : |
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""" |
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This object represents the information about our attempt to render some specific page |
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""" |
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def __init__ (self, url, path, basename, url_tail) : |
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""" |
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Initialize the page at the given location |
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@param url the URL leading to this page |
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@param path the filesystem path to this page's file |
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@param basename the filesystem name of this page's file, without the file extension |
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@param url_trail trailing URL for this page |
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""" |
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# store |
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self.url = url |
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self.path = path |
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self.basename = basename |
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self.url_tail = url_tail |
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# sub-init |
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self._init() |
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def _init (self) : |
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""" |
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Do initial data loading, etc |
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""" |
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pass |
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def get_title (self) : |
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""" |
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Return the page's title |
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Defaults to the Titlecase'd file basename |
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""" |
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return self.basename.title() |
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def get_content (self) : |
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""" |
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Return the page content as a string |
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""" |
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abstract |
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class HTMLPage (Page) : |
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""" |
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A simple .html page that's just passed through directly |
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""" |
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def get_content (self) : |
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""" |
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Opens the .html file, reads and returns contents |
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""" |
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return open(self.path, 'rb').read() |
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class TemplatePage (Page) : |
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""" |
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A template that's rendered using our template library |
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""" |
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def get_content (self) : |
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""" |
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Loads the .tmpl file, and renders it |
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""" |
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return template.render_file(self.path) |
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# list of page handlers, by type |
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TYPE_HANDLERS = [ |
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('html', HTMLPage ), |
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(template.TEMPLATE_EXT, TemplatePage ), |
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] |
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def _lookup_handler (url, path, filename, basename, extension, tail) : |
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""" |
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We found the file that we looked for, now get its handler |
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""" |
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# find appropriate handler |
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for handler_ext, handler in TYPE_HANDLERS : |
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# match against file extension? |
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if handler_ext == extension : |
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# found handler, return instance |
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return handler(url, path, basename, tail) |
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# no handler found |
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raise PageError("No handler found for page %r of type %r" % (url, extension)) |
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def lookup (name) : |
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""" |
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Look up and return a Page object for the given page, or raise an error |
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""" |
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# inital path |
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path = PAGE_DIR |
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url_segments = [] |
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# name segments |
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segments = name.split('/') |
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128 |
|
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# iterate through the parts of the page segments |
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130 |
while segments : |
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131 |
# pop segment |
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132 |
segment = segments.pop(0) |
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133 |
|
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134 |
# add to page url |
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135 |
url_segments.append(segment) |
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136 |
|
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137 |
# translate empty -> index |
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138 |
if not segment : |
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139 |
segment = 'index' |
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140 |
|
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141 |
# look for it in the dir |
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142 |
for filename in os.listdir(path) : |
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143 |
# build full file path |
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144 |
file_path = os.path.join(path, filename) |
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145 |
|
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146 |
# stat, recurse into subdirectory? |
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147 |
if os.path.isdir(file_path) and filename == segment : |
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148 |
# use new dir |
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149 |
path = file_path |
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150 |
|
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151 |
# break for-loop to look at next segment |
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152 |
break |
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153 |
|
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154 |
# split into basename + extension |
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155 |
basename, extension = os.path.splitext(filename) |
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156 |
|
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157 |
# ...remove that dot |
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158 |
extension = extension.lstrip('.') |
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159 |
|
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160 |
# match against requested page name? |
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and it works, a lot better than before
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161 |
if basename == segment : |
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162 |
# found the file we wanted |
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163 |
return _lookup_handler('/'.join(url_segments), file_path, filename, basename, extension, '/'.join(segments)) |
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164 |
|
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165 |
else : |
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and it works, a lot better than before
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166 |
# inspect next file in dir |
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167 |
continue |
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168 |
|
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169 |
# did not find the filename we were looking for in os.listdir |
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and it works, a lot better than before
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170 |
raise PageError("Page not found: %s" % name, status='404 Not Found') |
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and it works, a lot better than before
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171 |