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annotate taginthemiddle/middleware.py @ 0:1c5cbbde4299

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initial commit of middleware tagging; doesnt yet work
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 04 May 2010 08:37:15 -0700
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children 837cfc05d4d9
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1 """
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2 request dispatcher:
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3 data persisting across requests should go here
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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 Index
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9 from model import Tags
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10
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11 from genshi.template import TemplateLoader
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12 from lxmlmiddleware import LXMLMiddleware
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13 from paste.fileapp import FileApp
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14 from pkg_resources import resource_filename
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15 from webob import Request, Response, exc
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16
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17 # tags have:
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18 # - a list of resources they're applied to
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19 # for now just assume auth is on and that anyone authenticated may tag
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20
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21 # e.g. a tags file
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22 # foo = /bar /fleem/baz etc
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23 # cats = /cats /blog/mycat
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24
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25 class Tagger(LXMLMiddleware):
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26
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27 # instance defaults
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28 defaults = { 'auto_reload': 'False',
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29 'template_dirs': '',
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30 'patterns': '*'
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31 'tags_file': None,
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32 'url': 'tags'
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33 'post_url': '.tags'
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34 }
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35
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36 def __init__(self, app, **kw):
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37 self.app = app
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38
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39 # set instance parameters from kw and defaults
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40 for key in self.defaults:
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41 setattr(self, key, kw.get(key, self.defaults[key]))
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42 self.auto_reload = self.auto_reload.lower() == 'true'
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43 assert self.tags_file is not None
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44 self.tags
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45 self.patterns = self.patterns.strip().split()
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46
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47 # request handlers
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48 self.handlers = [ Cloud ]
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49
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50 # template loader
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51 self.template_dirs = self.template_dirs.split()
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52 self.template_dirs.append(resource_filename(__name__, 'templates'))
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53 self.loader = TemplateLoader(self.template_dirs,
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54 auto_reload=self.auto_reload)
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55
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56 def __call__(self, environ, start_response):
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57
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58 # get a request object
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59 request = Request(environ)
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60
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61 # get the path
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62 path = request.path_info.strip('/').split('/')
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63 if path == ['']:
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64 path = []
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65 request.environ['path'] = path
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66
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67 # match the request to a handler
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68 for h in self.handlers:
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69 handler = h.match(self, request)
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70 if handler is not None:
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71 break
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72 else:
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73 if self.app:
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74 return self.app(environ, start_response)
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75 handler = exc.HTTPNotFound
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76
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77 # add navigation links to handler [example]
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78 if hasattr(handler, 'data'):
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79 handler.data.setdefault('links', [])
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80 for h in self.handlers:
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81 handler.data['links'].append((handler.link(h.handler_path),
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82 h.__name__))
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83
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84 # get response
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85 res = handler()
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86 return res(environ, start_response)