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annotate taginthemiddle/middleware.py @ 19:57ca873ed9bf default tip

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make this a pluggable system and start reorging infrastructure for that
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 25 May 2010 07:48:53 -0700
parents 1701e5b0b0eb
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1 """
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2 apply and display tags via WSGI middleware;
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3 request dispatcher component
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4 """
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5
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6 import os
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7
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8 from handlers import TagCloud, ViewTags, PostTags
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9
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10 from genshi.template import TemplateLoader
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11 from lxmlmiddleware import LXMLMiddleware
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12 from paste.fileapp import FileApp
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13 from pkg_resources import resource_filename
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14 from webob import Request, Response, exc
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16 class Tagger(LXMLMiddleware):
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18 # instance defaults
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19 defaults = { 'auto_reload': 'False',
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20 'template_dirs': '',
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21 'patterns': '*', # glob pattern: all URLs by default
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22 'tags_url': 'tags', # base URL for viewing tags
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23 'post_url': '.tags', # sub-URL for posting tags
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24 'author': None, # for RSS
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25 'engine': None
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26 }
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28 def __init__(self, app, **kw):
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29 self.app = app
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31 # set instance parameters from kw and defaults
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32 for key in self.defaults:
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33 setattr(self, key, kw.get(key, self.defaults[key]))
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34 self.auto_reload = self.auto_reload.lower() == 'true'
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35 self.patterns = self.patterns.strip().split()
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37 # request handlers
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38 self.handlers = [ TagCloud, ViewTags, PostTags ]
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40 # template loader
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41 self.template_dirs = self.template_dirs.split()
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42 self.template_dirs.append(resource_filename(__name__, 'templates'))
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43 self.loader = TemplateLoader(self.template_dirs,
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44 auto_reload=self.auto_reload)
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45
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46 # tag engine
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47 assert self.engine is not None, 'Must specify a tag.engine'
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48
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49 def __call__(self, environ, start_response):
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50
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51 # get a request object
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52 request = Request(environ)
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54 # get the path
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55 path = request.path_info.strip('/').split('/')
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56 if path == ['']:
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57 path = []
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58 request.environ['path'] = path
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60 # match the request to a handler
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61 for h in self.handlers:
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62 handler = h.match(self, request)
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63 if handler is not None:
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64 break
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65 else:
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66 if self.app:
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67 return self.app(environ, start_response)
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68 handler = exc.HTTPNotFound
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70 # get response
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71 res = handler()
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72 return res(environ, start_response)
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74 def manipulate(self, request, response, tree):
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75 return tree