1 | ############################################################################## |
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2 | # |
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3 | # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved. |
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4 | # |
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5 | # This software is subject to the provisions of the Zope Public License, |
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6 | # Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. |
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7 | # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED |
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8 | # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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9 | # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS |
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10 | # FOR A PARTICULAR PURPOSE. |
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11 | # |
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12 | ############################################################################## |
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13 | # This code is a modified version of CMFCore's CachingPolicyManager.py |
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14 | """Caching tool implementation. |
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15 | |
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16 | $Id: CachingPolicyManager.py 40138 2005-11-15 17:47:37Z jens $ |
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17 | """ |
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18 | |
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19 | import os |
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20 | |
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21 | from Globals import package_home |
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22 | from AccessControl import ClassSecurityInfo |
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23 | from Globals import InitializeClass |
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24 | from Globals import DTMLFile |
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25 | |
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26 | from Products.CMFCore import permissions |
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27 | from Products.CMFCore.utils import getToolByName |
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28 | from Products.CMFCore.CachingPolicyManager import CachingPolicyManager as CMFCachingPolicyManager |
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29 | |
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30 | from Products.CacheSetup.config import CACHE_TOOL_ID |
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31 | |
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32 | class CSCachingPolicyManager( CMFCachingPolicyManager ): |
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33 | """ |
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34 | Manage the set of CachingPolicy objects for the site; dispatch |
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35 | to them from skin methods. |
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36 | """ |
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37 | |
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38 | id = 'caching_policy_manager' |
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39 | meta_type = 'CacheFu Caching Policy Manager' |
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40 | |
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41 | security = ClassSecurityInfo() |
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42 | |
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43 | security.declareProtected(permissions.ManagePortal, 'manage_cachingPolicies') |
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44 | manage_cachingPolicies = DTMLFile('cachingPoliciesDummy', os.path.dirname(package_home(globals()))) |
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45 | |
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46 | # A new method that replaces getHTTPCachingHeaders |
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47 | security.declareProtected( permissions.View, 'getHeadersToAddAndRemove' ) |
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48 | def getHeadersToAddAndRemove( self, content, view_method, keywords, time=None): |
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49 | """Return a tuple of HTTP caching headers, (headers_to_add, headers_to_remove). |
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50 | The first item is a list of headers to add to the response in the form |
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51 | (header name, header value). The second item is a list of headers that |
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52 | should be removed (before adding).""" |
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53 | pcs = getToolByName(self, CACHE_TOOL_ID, None) |
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54 | if pcs is None or not pcs.getEnabled(): |
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55 | return () |
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56 | member = pcs.getMember() |
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57 | request = content.REQUEST |
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58 | (rule, header_set) = pcs.getRuleAndHeaderSet(request, content, view_method, member) |
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59 | if header_set: |
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60 | expr_context = rule._getExpressionContext(request, content, view_method, member) |
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61 | return header_set.getHeaders(expr_context) |
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62 | return () |
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63 | |
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64 | # |
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65 | # 'portal_caching' interface methods |
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66 | # |
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67 | security.declareProtected( permissions.View, 'getHTTPCachingHeaders' ) |
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68 | def getHTTPCachingHeaders( self, content, view_method, keywords, time=None): |
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69 | """Return a list of HTTP caching headers based on 'content', 'view_method', and 'keywords'.""" |
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70 | hdrs = self.getHeadersToAddAndRemove(content, view_method, keywords, time) |
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71 | if hdrs: |
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72 | return hdrs[0] |
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73 | return () |
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74 | |
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75 | security.declareProtected( permissions.View, 'getModTimeAndETag' ) |
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76 | def getModTimeAndETag( self, content, view_method, keywords, time=None): |
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77 | """ Return the modification time and ETag for the content object, |
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78 | view method, and keywords as the tuple (modification_time, etag, |
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79 | set_last_modified_header), where modification_time is a DateTime, |
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80 | or None. |
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81 | """ |
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82 | pcs = getToolByName(self, CACHE_TOOL_ID, None) |
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83 | if pcs is None or not pcs.getEnabled(): |
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84 | return None |
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85 | member = pcs.getMember() |
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86 | request = content.REQUEST |
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87 | (rule, header_set) = pcs.getRuleAndHeaderSet(request, content, view_method, member) |
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88 | if header_set: |
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89 | expr_context = rule._getExpressionContext(request, content, view_method, member) |
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90 | etag = header_set.getEtagValue(expr_context) |
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91 | mod_time = header_set.getLastModifiedValue(expr_context) |
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92 | use_mod_time = header_set.getLastModified() |
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93 | return (mod_time, etag, use_mod_time) |
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94 | |
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95 | security.declareProtected( permissions.View, 'getETag' ) |
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96 | def getETag( self, content, view_method, keywords, time=None): |
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97 | """ Return the ETag for the content object; ignores getEnable304s setting""" |
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98 | pcs = getToolByName(self, CACHE_TOOL_ID, None) |
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99 | if pcs is None or not pcs.getEnabled(): |
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100 | return None |
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101 | member = pcs.getMember() |
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102 | request = content.REQUEST |
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103 | (rule, header_set) = pcs.getRuleAndHeaderSet(request, content, view_method, member) |
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104 | if header_set: |
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105 | expr_context = rule._getExpressionContext(request, content, view_method, member) |
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106 | etag = header_set.getEtagValue(expr_context) |
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107 | return etag |
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108 | |
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109 | InitializeClass( CSCachingPolicyManager ) |
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