author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Fri, 25 Sep 2009 11:25:27 +0200 | |
changeset 3472 | 5345570eefc6 |
parent 3163 | edfe43ceaa35 |
child 3629 | 559cad62c786 |
permissions | -rw-r--r-- |
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"""Base class for request/session |
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|
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:organization: Logilab |
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2. |
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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:license: Library General Public License version 2 - http://www.gnu.org/licenses |
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""" |
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__docformat__ = "restructuredtext en" |
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fix urlquote imports
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from urllib import quote as urlquote, unquote as urlunquote |
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from datetime import time, datetime, timedelta |
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|
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from logilab.common.decorators import cached |
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|
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from cubicweb import Unauthorized, typed_eid |
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from cubicweb.rset import ResultSet |
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from cubicweb.utils import ustrftime, strptime, todate, todatetime |
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ONESECOND = timedelta(0, 1, 0) |
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CACHE_REGISTRY = {} |
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class Cache(dict): |
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def __init__(self): |
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super(Cache, self).__init__() |
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_now = datetime.now() |
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self.cache_creation_date = _now |
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self.latest_cache_lookup = _now |
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class RequestSessionBase(object): |
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"""base class containing stuff shared by server session and web request |
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request/session is the main resources accessor, mainly through it's vreg |
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attribute: |
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:vreg: |
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the instance's registry |
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:vreg.schema: |
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the instance's schema |
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:vreg.config: |
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the instance's configuration |
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""" |
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def __init__(self, vreg): |
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self.vreg = vreg |
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try: |
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encoding = vreg.property_value('ui.encoding') |
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except: # no vreg or property not registered |
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encoding = 'utf-8' |
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self.encoding = encoding |
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# cache result of execution for (rql expr / eids), |
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# should be emptied on commit/rollback of the server session / web |
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# connection |
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self.local_perm_cache = {} |
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self._ = unicode |
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def property_value(self, key): |
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"""return value of the property with the given key, giving priority to |
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user specific value if any, else using site value |
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""" |
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if self.user: |
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return self.user.property_value(key) |
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return self.vreg.property_value(key) |
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def etype_rset(self, etype, size=1): |
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"""return a fake result set for a particular entity type""" |
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rset = ResultSet([('A',)]*size, '%s X' % etype, |
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description=[(etype,)]*size) |
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def get_entity(row, col=0, etype=etype, req=self, rset=rset): |
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return req.vreg.etype_class(etype)(req, rset, row, col) |
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rset.get_entity = get_entity |
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return self.decorate_rset(rset) |
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def eid_rset(self, eid, etype=None): |
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"""return a result set for the given eid without doing actual query |
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(we have the eid, we can suppose it exists and user has access to the |
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entity) |
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""" |
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eid = typed_eid(eid) |
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if etype is None: |
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etype = self.describe(eid)[0] |
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rset = ResultSet([(eid,)], 'Any X WHERE X eid %(x)s', {'x': eid}, |
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[(etype,)]) |
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return self.decorate_rset(rset) |
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|
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def empty_rset(self): |
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"""return a result set for the given eid without doing actual query |
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(we have the eid, we can suppose it exists and user has access to the |
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entity) |
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""" |
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return self.decorate_rset(ResultSet([], 'Any X WHERE X eid -1')) |
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def entity_from_eid(self, eid, etype=None): |
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"""return an entity instance for the given eid. No query is done""" |
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try: |
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95 |
return self.entity_cache(eid) |
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96 |
except KeyError: |
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97 |
rset = self.eid_rset(eid, etype) |
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98 |
entity = rset.get_entity(0, 0) |
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99 |
self.set_entity_cache(entity) |
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100 |
return entity |
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|
101 |
|
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102 |
def entity_cache(self, eid): |
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103 |
raise KeyError |
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104 |
|
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105 |
def set_entity_cache(self, entity): |
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106 |
pass |
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107 |
|
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108 |
# XXX move to CWEntityManager or even better as factory method (unclear |
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109 |
# where yet...) |
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110 |
def create_entity(self, etype, *args, **kwargs): |
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111 |
"""add a new entity of the given type""" |
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112 |
rql = 'INSERT %s X' % etype |
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113 |
relations = [] |
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114 |
restrictions = [] |
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115 |
cachekey = [] |
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116 |
for rtype, rvar in args: |
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117 |
relations.append('X %s %s' % (rtype, rvar)) |
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118 |
restrictions.append('%s eid %%(%s)s' % (rvar, rvar)) |
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119 |
cachekey.append(rvar) |
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120 |
for attr in kwargs: |
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121 |
if attr in cachekey: |
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122 |
continue |
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123 |
relations.append('X %s %%(%s)s' % (attr, attr)) |
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124 |
if relations: |
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125 |
rql = '%s: %s' % (rql, ', '.join(relations)) |
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126 |
if restrictions: |
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127 |
rql = '%s WHERE %s' % (rql, ', '.join(restrictions)) |
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128 |
return self.execute(rql, kwargs, cachekey).get_entity(0, 0) |
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129 |
|
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130 |
def ensure_ro_rql(self, rql): |
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131 |
"""raise an exception if the given rql is not a select query""" |
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132 |
first = rql.split(' ', 1)[0].lower() |
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133 |
if first in ('insert', 'set', 'delete'): |
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134 |
raise Unauthorized(self._('only select queries are authorized')) |
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135 |
|
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136 |
def get_cache(self, cachename): |
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137 |
""" |
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138 |
NOTE: cachename should be dotted names as in : |
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139 |
- cubicweb.mycache |
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140 |
- cubes.blog.mycache |
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141 |
- etc. |
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142 |
""" |
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143 |
if cachename in CACHE_REGISTRY: |
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144 |
cache = CACHE_REGISTRY[cachename] |
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145 |
else: |
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146 |
cache = CACHE_REGISTRY[cachename] = Cache() |
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|
147 |
_now = datetime.now() |
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148 |
if _now > cache.latest_cache_lookup + ONESECOND: |
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|
149 |
ecache = self.execute( |
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150 |
'Any C,T WHERE C is CWCache, C name %(name)s, C timestamp T', |
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|
151 |
{'name':cachename}).get_entity(0,0) |
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|
152 |
cache.latest_cache_lookup = _now |
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153 |
if not ecache.valid(cache.cache_creation_date): |
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|
154 |
cache.clear() |
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|
155 |
cache.cache_creation_date = _now |
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|
156 |
return cache |
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|
157 |
|
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|
158 |
# url generation methods ################################################## |
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|
159 |
|
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|
160 |
def build_url(self, *args, **kwargs): |
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|
161 |
"""return an absolute URL using params dictionary key/values as URL |
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|
162 |
parameters. Values are automatically URL quoted, and the |
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|
163 |
publishing method to use may be specified or will be guessed. |
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|
164 |
""" |
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|
165 |
# use *args since we don't want first argument to be "anonymous" to |
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|
166 |
# avoid potential clash with kwargs |
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167 |
if args: |
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168 |
assert len(args) == 1, 'only 0 or 1 non-named-argument expected' |
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169 |
method = args[0] |
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170 |
else: |
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171 |
method = None |
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172 |
# XXX I (adim) think that if method is passed explicitly, we should |
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173 |
# not try to process it and directly call req.build_url() |
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|
174 |
if method is None: |
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175 |
if self.from_controller() == 'view' and not '_restpath' in kwargs: |
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176 |
method = self.relative_path(includeparams=False) or 'view' |
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177 |
else: |
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178 |
method = 'view' |
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179 |
base_url = kwargs.pop('base_url', None) |
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180 |
if base_url is None: |
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181 |
base_url = self.base_url() |
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182 |
if '_restpath' in kwargs: |
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183 |
assert method == 'view', method |
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184 |
path = kwargs.pop('_restpath') |
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185 |
else: |
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|
186 |
path = method |
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187 |
if not kwargs: |
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188 |
return u'%s%s' % (base_url, path) |
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189 |
return u'%s%s?%s' % (base_url, path, self.build_url_params(**kwargs)) |
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190 |
|
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191 |
|
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192 |
def build_url_params(self, **kwargs): |
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193 |
"""return encoded params to incorporate them in an URL""" |
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194 |
args = [] |
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195 |
for param, values in kwargs.items(): |
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196 |
if not isinstance(values, (list, tuple)): |
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197 |
values = (values,) |
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198 |
for value in values: |
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199 |
args.append(u'%s=%s' % (param, self.url_quote(value))) |
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200 |
return '&'.join(args) |
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201 |
|
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202 |
def url_quote(self, value, safe=''): |
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203 |
"""urllib.quote is not unicode safe, use this method to do the |
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204 |
necessary encoding / decoding. Also it's designed to quote each |
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205 |
part of a url path and so the '/' character will be encoded as well. |
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206 |
""" |
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207 |
if isinstance(value, unicode): |
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208 |
quoted = urlquote(value.encode(self.encoding), safe=safe) |
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209 |
return unicode(quoted, self.encoding) |
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210 |
return urlquote(str(value), safe=safe) |
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211 |
|
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212 |
def url_unquote(self, quoted): |
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213 |
"""returns a unicode unquoted string |
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214 |
|
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215 |
decoding is based on `self.encoding` which is the encoding |
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216 |
used in `url_quote` |
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217 |
""" |
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218 |
if isinstance(quoted, unicode): |
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219 |
quoted = quoted.encode(self.encoding) |
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220 |
try: |
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221 |
return unicode(urlunquote(quoted), self.encoding) |
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222 |
except UnicodeDecodeError: # might occurs on manually typed URLs |
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223 |
return unicode(urlunquote(quoted), 'iso-8859-1') |
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224 |
|
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225 |
# bound user related methods ############################################### |
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226 |
|
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227 |
@cached |
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228 |
def user_data(self): |
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229 |
"""returns a dictionnary with this user's information""" |
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230 |
userinfo = {} |
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231 |
if self.is_internal_session: |
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232 |
userinfo['login'] = "cubicweb" |
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233 |
userinfo['name'] = "cubicweb" |
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234 |
userinfo['email'] = "" |
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235 |
return userinfo |
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236 |
user = self.actual_session().user |
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237 |
userinfo['login'] = user.login |
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238 |
userinfo['name'] = user.name() |
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239 |
userinfo['email'] = user.get_email() |
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240 |
return userinfo |
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241 |
|
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242 |
def is_internal_session(self): |
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243 |
"""overrided on the server-side""" |
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244 |
return False |
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245 |
|
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246 |
# formating methods ####################################################### |
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247 |
|
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248 |
def view(self, __vid, rset=None, __fallback_oid=None, __registry='views', |
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249 |
**kwargs): |
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250 |
"""shortcut to self.vreg.view method avoiding to pass the request""" |
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251 |
return self.vreg[__registry].render(__vid, self, __fallback_oid, |
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252 |
rset=rset, **kwargs) |
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253 |
|
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254 |
def format_date(self, date, date_format=None, time=False): |
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255 |
"""return a string for a date time according to instance's |
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256 |
configuration |
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257 |
""" |
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258 |
if date: |
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259 |
if date_format is None: |
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260 |
if time: |
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261 |
date_format = self.property_value('ui.datetime-format') |
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262 |
else: |
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263 |
date_format = self.property_value('ui.date-format') |
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264 |
return ustrftime(date, date_format) |
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265 |
return u'' |
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266 |
|
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267 |
def format_time(self, time): |
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268 |
"""return a string for a time according to instance's |
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269 |
configuration |
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270 |
""" |
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271 |
if time: |
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272 |
return ustrftime(time, self.property_value('ui.time-format')) |
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273 |
return u'' |
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274 |
|
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275 |
def format_float(self, num): |
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276 |
"""return a string for floating point number according to instance's |
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277 |
configuration |
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278 |
""" |
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279 |
if num: |
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280 |
return self.property_value('ui.float-format') % num |
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281 |
return u'' |
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282 |
|
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283 |
def parse_datetime(self, value, etype='Datetime'): |
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284 |
"""get a datetime or time from a string (according to etype) |
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285 |
Datetime formatted as Date are accepted |
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286 |
""" |
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287 |
assert etype in ('Datetime', 'Date', 'Time'), etype |
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288 |
# XXX raise proper validation error |
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289 |
if etype == 'Datetime': |
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290 |
format = self.property_value('ui.datetime-format') |
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291 |
try: |
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292 |
return todatetime(strptime(value, format)) |
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293 |
except ValueError: |
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294 |
pass |
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295 |
elif etype == 'Time': |
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296 |
format = self.property_value('ui.time-format') |
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297 |
try: |
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298 |
# (adim) I can't find a way to parse a Time with a custom format |
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299 |
date = strptime(value, format) # this returns a DateTime |
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300 |
return time(date.hour, date.minute, date.second) |
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301 |
except ValueError: |
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302 |
raise ValueError('can\'t parse %r (expected %s)' % (value, format)) |
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303 |
try: |
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304 |
format = self.property_value('ui.date-format') |
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|
305 |
dt = strptime(value, format) |
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306 |
if etype == 'Datetime': |
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|
307 |
return todatetime(dt) |
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|
308 |
return todate(dt) |
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|
309 |
except ValueError: |
135580d15d42
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|
310 |
raise ValueError('can\'t parse %r (expected %s)' % (value, format)) |
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|
311 |
|
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312 |
# abstract methods to override according to the web front-end ############# |
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|
313 |
|
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|
314 |
def base_url(self): |
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315 |
"""return the root url of the instance""" |
135580d15d42
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|
316 |
raise NotImplementedError |
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|
317 |
|
135580d15d42
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|
318 |
def decorate_rset(self, rset): |
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319 |
"""add vreg/req (at least) attributes to the given result set """ |
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320 |
raise NotImplementedError |
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|
321 |
|
135580d15d42
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322 |
def describe(self, eid): |
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323 |
"""return a tuple (type, sourceuri, extid) for the entity with id <eid>""" |
135580d15d42
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|
324 |
raise NotImplementedError |