--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/memory/params.py	Fri Mar 21 16:08:11 2014 +0100
@@ -0,0 +1,673 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# SAT: a jabber client
+# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from sat.core.i18n import _
+
+from sat.core import exceptions
+from sat.core.constants import Const as C
+from xml.dom import minidom
+from logging import debug, info, warning, error
+from twisted.internet import defer
+from twisted.python.failure import Failure
+from sat.tools.xml_tools import paramsXML2XMLUI
+
+
+class Params(object):
+    """This class manage parameters with xml"""
+    ### TODO: add desciption in params
+
+    #TODO: move Watched in a plugin
+    #TODO: when priority is changed, a new presence stanza must be emitted
+    #TODO: int type (Priority should be int instead of string)
+    default_xml = u"""
+    <params>
+    <general>
+    </general>
+    <individual>
+        <category name="Connection" label="%(category_connection)s">
+            <param name="JabberID" value="name@example.org/SàT" type="string" />
+            <param name="Password" value="" type="password" />
+            <param name="Priority" value="50" type="string" />
+            <param name="Server" value="example.org" type="string" />
+            <param name="Port" value="5222" type="string" />
+            <param name="NewAccount" label="%(label_NewAccount)s" type="button" callback_id="registerNewAccount"/>
+            <param name="autoconnect" label="%(label_autoconnect)s" value="true" type="bool" />
+            <param name="autodisconnect" label="%(label_autodisconnect)s" value="false"  type="bool" />
+        </category>
+        <category name="Misc" label="%(category_misc)s">
+            <param name="Watched" value="test@Jabber.goffi.int" type="string" />
+        </category>
+    </individual>
+    </params>
+    """ % {
+        'category_connection': _("Connection"),
+        'label_NewAccount': _("Register new account"),
+        'label_autoconnect': _('Connect on frontend startup'),
+        'label_autodisconnect': _('Disconnect on frontend closure'),
+        'category_misc': _("Misc")
+    }
+
+    def load_default_params(self):
+        self.dom = minidom.parseString(Params.default_xml.encode('utf-8'))
+
+    def _mergeParams(self, source_node, dest_node):
+        """Look for every node in source_node and recursively copy them to dest if they don't exists"""
+
+        def getNodesMap(children):
+            ret = {}
+            for child in children:
+                if child.nodeType == child.ELEMENT_NODE:
+                    ret[(child.tagName, child.getAttribute('name'))] = child
+            return ret
+        source_map = getNodesMap(source_node.childNodes)
+        dest_map = getNodesMap(dest_node.childNodes)
+        source_set = set(source_map.keys())
+        dest_set = set(dest_map.keys())
+        to_add = source_set.difference(dest_set)
+
+        for node_key in to_add:
+            dest_node.appendChild(source_map[node_key].cloneNode(True))
+
+        to_recurse = source_set - to_add
+        for node_key in to_recurse:
+            self._mergeParams(source_map[node_key], dest_map[node_key])
+
+    def load_xml(self, xml_file):
+        """Load parameters template from file"""
+        self.dom = minidom.parse(xml_file)
+        default_dom = minidom.parseString(Params.default_xml.encode('utf-8'))
+        self._mergeParams(default_dom.documentElement, self.dom.documentElement)
+
+    def loadGenParams(self):
+        """Load general parameters data from storage
+        @return: deferred triggered once params are loaded"""
+        return self.storage.loadGenParams(self.params_gen)
+
+    def loadIndParams(self, profile, cache=None):
+        """Load individual parameters
+        set self.params cache or a temporary cache
+        @param profile: profile to load (*must exist*)
+        @param cache: if not None, will be used to store the value, as a short time cache
+        @return: deferred triggered once params are loaded"""
+        if cache is None:
+            self.params[profile] = {}
+        return self.storage.loadIndParams(self.params[profile] if cache is None else cache, profile)
+
+    def purgeProfile(self, profile):
+        """Remove cache data of a profile
+        @param profile: %(doc_profile)s"""
+        try:
+            del self.params[profile]
+        except KeyError:
+            error(_("Trying to purge cache of a profile not in memory: [%s]") % profile)
+
+    def save_xml(self, filename):
+        """Save parameters template to xml file"""
+        with open(filename, 'wb') as xml_file:
+            xml_file.write(self.dom.toxml('utf-8'))
+
+    def __init__(self, host, storage):
+        debug("Parameters init")
+        self.host = host
+        self.storage = storage
+        self.default_profile = None
+        self.params = {}
+        self.params_gen = {}
+        host.registerCallback(host.registerNewAccountCB, with_data=True, force_id="registerNewAccount")
+
+    def asyncCreateProfile(self, profile):
+        """Create a new profile
+        @param profile: name of the profile
+        @param callback: called when the profile actually exists in database and memory
+        @return: a Deferred instance
+        """
+        if self.storage.hasProfile(profile):
+            info(_('The profile name already exists'))
+            return defer.fail(Failure(exceptions.ConflictError))
+        if not self.host.trigger.point("ProfileCreation", profile):
+            return defer.fail(Failure(exceptions.CancelError))
+        return self.storage.createProfile(profile)
+
+    def asyncDeleteProfile(self, profile, force=False):
+        """Delete an existing profile
+        @param profile: name of the profile
+        @param force: force the deletion even if the profile is connected.
+        To be used for direct calls only (not through the bridge).
+        @return: a Deferred instance
+        """
+        if not self.storage.hasProfile(profile):
+            info(_('Trying to delete an unknown profile'))
+            return defer.fail(Failure(exceptions.ProfileUnknownError))
+        if not force and self.host.isConnected(profile):
+            info(_("Trying to delete a connected profile"))
+            return defer.fail(Failure(exceptions.ConnectedProfileError))
+        return self.storage.deleteProfile(profile)
+
+    def getProfileName(self, profile_key, return_profile_keys = False):
+        """return profile according to profile_key
+        @param profile_key: profile name or key which can be
+                            @ALL@ for all profiles
+                            @DEFAULT@ for default profile
+        @param return_profile_keys: if True, return unmanaged profile keys (like "@ALL@"). This keys must be managed by the caller
+        @return: requested profile name or emptry string if it doesn't exist"""
+        if profile_key == '@DEFAULT@':
+            default = self.host.memory.memory_data.get('Profile_default')
+            if not default:
+                info(_('No default profile, returning first one'))  # TODO: manage real default profile
+                try:
+                    default = self.host.memory.memory_data['Profile_default'] = self.storage.getProfilesList()[0]
+                except IndexError:
+                    info(_('No profile exist yet'))
+                    return ""
+            return default  # FIXME: temporary, must use real default value, and fallback to first one if it doesn't exists
+        elif profile_key == '@NONE@':
+            raise exceptions.ProfileNotSetError
+        elif return_profile_keys and profile_key in ["@ALL@"]:
+            return profile_key # this value must be managed by the caller
+        if not self.storage.hasProfile(profile_key):
+            info(_('Trying to access an unknown profile'))
+            return "" # FIXME: raise exceptions.ProfileUnknownError here (must be well checked, this method is used in lot of places)
+        return profile_key
+
+    def __get_unique_node(self, parent, tag, name):
+        """return node with given tag
+        @param parent: parent of nodes to check (e.g. documentElement)
+        @param tag: tag to check (e.g. "category")
+        @param name: name to check (e.g. "JID")
+        @return: node if it exist or None
+        """
+        for node in parent.childNodes:
+            if node.nodeName == tag and node.getAttribute("name") == name:
+                #the node already exists
+                return node
+        #the node is new
+        return None
+
+    def updateParams(self, xml, security_limit=C.NO_SECURITY_LIMIT, app=''):
+        """import xml in parameters, update if the param already exists
+        If security_limit is specified and greater than -1, the parameters
+        that have a security level greater than security_limit are skipped.
+        @param xml: parameters in xml form
+        @param security_limit: -1 means no security, 0 is the maximum security then the higher the less secure
+        @param app: name of the frontend registering the parameters or empty value
+        """
+        src_parent = minidom.parseString(xml.encode('utf-8')).documentElement
+
+        def pre_process_app_node(src_parent, security_limit, app):
+            """Parameters that are registered from a frontend must be checked"""
+            to_remove = []
+            for type_node in src_parent.childNodes:
+                if type_node.nodeName != C.INDIVIDUAL:
+                    to_remove.append(type_node)  # accept individual parameters only
+                    continue
+                for cat_node in type_node.childNodes:
+                    if cat_node.nodeName != 'category':
+                        to_remove.append(cat_node)
+                        continue
+                    to_remove_count = 0  # count the params to be removed from current category
+                    for node in cat_node.childNodes:
+                        if node.nodeName != "param" or not self.checkSecurityLimit(node, security_limit):
+                            to_remove.append(node)
+                            to_remove_count += 1
+                            continue
+                        node.setAttribute('app', app)
+                    if len(cat_node.childNodes) == to_remove_count:  # remove empty category
+                        for dummy in xrange(0, to_remove_count):
+                            to_remove.pop()
+                        to_remove.append(cat_node)
+            for node in to_remove:
+                node.parentNode.removeChild(node)
+
+        def import_node(tgt_parent, src_parent):
+            for child in src_parent.childNodes:
+                if child.nodeName == '#text':
+                    continue
+                node = self.__get_unique_node(tgt_parent, child.nodeName, child.getAttribute("name"))
+                if not node:  # The node is new
+                    tgt_parent.appendChild(child)
+                else:
+                    if child.nodeName == "param":
+                        # The child updates an existing parameter, we replace the node
+                        tgt_parent.replaceChild(child, node)
+                    else:
+                        # the node already exists, we recurse 1 more level
+                        import_node(node, child)
+
+        if app:
+            pre_process_app_node(src_parent, security_limit, app)
+        import_node(self.dom.documentElement, src_parent)
+
+    def paramsRegisterApp(self, xml, security_limit, app):
+        """Register frontend's specific parameters
+        If security_limit is specified and greater than -1, the parameters
+        that have a security level greater than security_limit are skipped.
+        @param xml: XML definition of the parameters to be added
+        @param security_limit: -1 means no security, 0 is the maximum security then the higher the less secure
+        @param app: name of the frontend registering the parameters
+        """
+        if not app:
+            warning(_("Trying to register frontends parameters with no specified app: aborted"))
+            return
+        if not hasattr(self, "frontends_cache"):
+            self.frontends_cache = []
+        if app in self.frontends_cache:
+            debug(_("Trying to register twice frontends parameters for %(app)s: aborted" % {"app": app}))
+            return
+        self.frontends_cache.append(app)
+        self.updateParams(xml, security_limit, app)
+        debug("Frontends parameters registered for %(app)s" % {'app': app})
+
+    def __default_ok(self, value, name, category):
+        #FIXME: will not work with individual parameters
+        self.setParam(name, value, category)
+
+    def __default_ko(self, failure, name, category):
+        error(_("Can't determine default value for [%(category)s/%(name)s]: %(reason)s") % {'category': category, 'name': name, 'reason': str(failure.value)})
+
+    def setDefault(self, name, category, callback, errback=None):
+        """Set default value of parameter
+        'default_cb' attibute of parameter must be set to 'yes'
+        @param name: name of the parameter
+        @param category: category of the parameter
+        @param callback: must return a string with the value (use deferred if needed)
+        @param errback: must manage the error with args failure, name, category
+        """
+        #TODO: send signal param update if value changed
+        #TODO: manage individual paramaters
+        debug ("setDefault called for %(category)s/%(name)s" % {"category": category, "name": name})
+        node = self._getParamNode(name, category, '@ALL@')
+        if not node:
+            error(_("Requested param [%(name)s] in category [%(category)s] doesn't exist !") % {'name': name, 'category': category})
+            return
+        if node[1].getAttribute('default_cb') == 'yes':
+            # del node[1].attributes['default_cb'] # default_cb is not used anymore as a flag to know if we have to set the default value,
+                                                   # and we can still use it later e.g. to call a generic setDefault method
+            value = self._getParam(category, name, C.GENERAL)
+            if value is None: # no value set by the user: we have the default value
+                debug ("Default value to set, using callback")
+                d = defer.maybeDeferred(callback)
+                d.addCallback(self.__default_ok, name, category)
+                d.addErrback(errback or self.__default_ko, name, category)
+
+    def _getAttr(self, node, attr, value):
+        """ get attribute value
+        @param node: XML param node
+        @param attr: name of the attribute to get (e.g.: 'value' or 'type')
+        @param value: user defined value"""
+        if attr == 'value':
+            value_to_use = value if value is not None else node.getAttribute(attr)  # we use value (user defined) if it exist, else we use node's default value
+            if node.getAttribute('type') == 'bool':
+                return value_to_use.lower() not in ('false', '0', 'no')
+            return value_to_use
+        return node.getAttribute(attr)
+
+    def __type_to_string(self, result):
+        """ convert result to string, according to its type """
+        if isinstance(result, bool):
+            return "true" if result else "false"
+        return result
+
+    def getStringParamA(self, name, category, attr="value", profile_key="@NONE@"):
+        """ Same as getParamA but for bridge: convert non string value to string """
+        return self.__type_to_string(self.getParamA(name, category, attr, profile_key))
+
+    def getParamA(self, name, category, attr="value", profile_key="@NONE@"):
+        """Helper method to get a specific attribute
+           @param name: name of the parameter
+           @param category: category of the parameter
+           @param attr: name of the attribute (default: "value")
+           @param profile: owner of the param (@ALL@ for everyone)
+
+           @return: attribute"""
+        #FIXME: looks really dirty and buggy, need to be reviewed/refactored
+        node = self._getParamNode(name, category)
+        if not node:
+            error(_("Requested param [%(name)s] in category [%(category)s] doesn't exist !") % {'name': name, 'category': category})
+            raise exceptions.NotFound
+
+        if node[0] == C.GENERAL:
+            value = self._getParam(category, name, C.GENERAL)
+            return self._getAttr(node[1], attr, value)
+
+        assert node[0] == C.INDIVIDUAL
+
+        profile = self.getProfileName(profile_key)
+        if not profile:
+            error(_('Requesting a param for an non-existant profile'))
+            raise exceptions.ProfileUnknownError
+
+        if profile not in self.params:
+            error(_('Requesting synchronous param for not connected profile'))
+            raise exceptions.NotConnectedProfileError(profile)
+
+        if attr == "value":
+            value = self._getParam(category, name, profile=profile)
+            return self._getAttr(node[1], attr, value)
+
+    def asyncGetStringParamA(self, name, category, attr="value", security_limit=C.NO_SECURITY_LIMIT, profile_key="@NONE@"):
+        d = self.asyncGetParamA(name, category, attr, security_limit, profile_key)
+        d.addCallback(self.__type_to_string)
+        return d
+
+    def asyncGetParamA(self, name, category, attr="value", security_limit=C.NO_SECURITY_LIMIT, profile_key="@NONE@"):
+        """Helper method to get a specific attribute
+           @param name: name of the parameter
+           @param category: category of the parameter
+           @param attr: name of the attribute (default: "value")
+           @param profile: owner of the param (@ALL@ for everyone)"""
+        node = self._getParamNode(name, category)
+        if not node:
+            error(_("Requested param [%(name)s] in category [%(category)s] doesn't exist !") % {'name': name, 'category': category})
+            return None
+
+        if not self.checkSecurityLimit(node[1], security_limit):
+            warning(_("Trying to get parameter '%(param)s' in category '%(cat)s' without authorization!!!"
+                      % {'param': name, 'cat': category}))
+            return None
+
+        if node[0] == C.GENERAL:
+            value = self._getParam(category, name, C.GENERAL)
+            return defer.succeed(self._getAttr(node[1], attr, value))
+
+        assert node[0] == C.INDIVIDUAL
+
+        profile = self.getProfileName(profile_key)
+        if not profile:
+            error(_('Requesting a param for a non-existant profile'))
+            return defer.fail()
+
+        if attr != "value":
+            return defer.succeed(node[1].getAttribute(attr))
+        try:
+            value = self._getParam(category, name, profile=profile)
+            return defer.succeed(self._getAttr(node[1], attr, value))
+        except exceptions.ProfileNotInCacheError:
+            #We have to ask data to the storage manager
+            d = self.storage.getIndParam(category, name, profile)
+            return d.addCallback(lambda value: self._getAttr(node[1], attr, value))
+
+    def _getParam(self, category, name, type_=C.INDIVIDUAL, cache=None, profile="@NONE@"):
+        """Return the param, or None if it doesn't exist
+        @param category: param category
+        @param name: param name
+        @param type_: GENERAL or INDIVIDUAL
+        @param cache: temporary cache, to use when profile is not logged
+        @param profile: the profile name (not profile key, i.e. name and not something like @DEFAULT@)
+        @return: param value or None if it doesn't exist
+        """
+        if type_ == C.GENERAL:
+            if (category, name) in self.params_gen:
+                return self.params_gen[(category, name)]
+            return None  # This general param has the default value
+        assert (type_ == C.INDIVIDUAL)
+        if profile == "@NONE@":
+            raise exceptions.ProfileNotSetError
+        if profile in self.params:
+            cache = self.params[profile]  # if profile is in main cache, we use it,
+                                          # ignoring the temporary cache
+        elif cache is None:  # else we use the temporary cache if it exists, or raise an exception
+            raise exceptions.ProfileNotInCacheError
+        if (category, name) not in cache:
+            return None
+        return cache[(category, name)]
+
+    def __constructProfileXml(self, security_limit, app, profile):
+        """Construct xml for asked profile, filling values when needed
+        /!\ as noticed in doc, don't forget to unlink the minidom.Document
+        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
+        Otherwise sole the params which have a security level defined *and*
+        lower or equal to the specified value are returned.
+        @param app: name of the frontend requesting the parameters, or '' to get all parameters
+        @param profile: profile name (not key !)
+        @return: a deferred that fire a minidom.Document of the profile xml (cf warning above)
+        """
+
+        def checkNode(node):
+            """Check the node against security_limit and app"""
+            return self.checkSecurityLimit(node, security_limit) and self.checkApp(node, app)
+
+        def constructProfile(ignore, profile_cache):
+            # init the result document
+            prof_xml = minidom.parseString('<params/>')
+            cache = {}
+
+            for type_node in self.dom.documentElement.childNodes:
+                if type_node.nodeName != C.GENERAL and type_node.nodeName != C.INDIVIDUAL:
+                    continue
+                # we use all params, general and individual
+                for cat_node in type_node.childNodes:
+                    if cat_node.nodeName != 'category':
+                        continue
+                    category = cat_node.getAttribute('name')
+                    dest_params = {}  # result (merged) params for category
+                    if category not in cache:
+                        # we make a copy for the new xml
+                        cache[category] = dest_cat = cat_node.cloneNode(True)
+                        for node in dest_cat.childNodes:
+                            if node.nodeName != "param":
+                                continue
+                            if not checkNode(node):
+                                dest_cat.removeChild(node)
+                                continue
+                            dest_params[node.getAttribute('name')] = node
+                        new_node = True
+                    else:
+                        # It's not a new node, we use the previously cloned one
+                        dest_cat = cache[category]
+                        new_node = False
+                    params = cat_node.getElementsByTagName("param")
+
+                    for param_node in params:
+                        # we have to merge new params (we are parsing individual parameters, we have to add them
+                        # to the previously parsed general ones)
+                        name = param_node.getAttribute('name')
+                        if not checkNode(param_node):
+                            continue
+                        if name not in dest_params:
+                            # this is reached when a previous category exists
+                            dest_params[name] = param_node.cloneNode(True)
+                            dest_cat.appendChild(dest_params[name])
+
+                        profile_value = self._getParam(category,
+                                                        name, type_node.nodeName,
+                                                        cache=profile_cache, profile=profile)
+                        if profile_value is not None:
+                            # there is a value for this profile, we must change the default
+                            dest_params[name].setAttribute('value', profile_value)
+                    if new_node:
+                        prof_xml.documentElement.appendChild(dest_cat)
+
+            to_remove = []
+            for cat_node in prof_xml.documentElement.childNodes:
+                # we remove empty categories
+                if cat_node.getElementsByTagName("param").length == 0:
+                    to_remove.append(cat_node)
+            for node in to_remove:
+                prof_xml.documentElement.removeChild(node)
+            return prof_xml
+
+        if profile in self.params:
+            d = defer.succeed(None)
+            profile_cache = self.params[profile]
+        else:
+            #profile is not in cache, we load values in a short time cache
+            profile_cache = {}
+            d = self.loadIndParams(profile, profile_cache)
+
+        return d.addCallback(constructProfile, profile_cache)
+
+    def getParamsUI(self, security_limit, app, profile_key):
+        """
+        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
+        Otherwise sole the params which have a security level defined *and*
+        lower or equal to the specified value are returned.
+        @param app: name of the frontend requesting the parameters, or '' to get all parameters
+        @param profile_key: Profile key which can be either a magic (eg: @DEFAULT@) or the name of an existing profile.
+        @return: a SàT XMLUI for parameters
+        """
+        profile = self.getProfileName(profile_key)
+        if not profile:
+            error(_("Asking params for inexistant profile"))
+            return ""
+        d = self.getParams(security_limit, app, profile)
+        return d.addCallback(lambda param_xml: paramsXML2XMLUI(param_xml))
+
+    def getParams(self, security_limit, app, profile_key):
+        """Construct xml for asked profile, take params xml as skeleton
+        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
+        Otherwise sole the params which have a security level defined *and*
+        lower or equal to the specified value are returned.
+        @param app: name of the frontend requesting the parameters, or '' to get all parameters
+        @param profile_key: Profile key which can be either a magic (eg: @DEFAULT@) or the name of an existing profile.
+        @return: XML of parameters
+        """
+        profile = self.getProfileName(profile_key)
+        if not profile:
+            error(_("Asking params for inexistant profile"))
+            return defer.succeed("")
+
+        def returnXML(prof_xml):
+            return_xml = prof_xml.toxml()
+            prof_xml.unlink()
+            return '\n'.join((line for line in return_xml.split('\n') if line))
+
+        return self.__constructProfileXml(security_limit, app, profile).addCallback(returnXML)
+
+    def getParamsForCategory(self, category, security_limit, app, profile_key):
+        """
+        @param category: the desired category
+        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
+        Otherwise sole the params which have a security level defined *and*
+        lower or equal to the specified value are returned.
+        @param app: name of the frontend requesting the parameters, or '' to get all parameters
+        @param profile_key: Profile key which can be either a magic (eg: @DEFAULT@) or the name of an existing profile.
+        @return: node's xml for selected category
+        """
+        #TODO: manage category of general type (without existant profile)
+        profile = self.getProfileName(profile_key)
+        if not profile:
+            error(_("Asking params for inexistant profile"))
+            return ""
+
+        def returnCategoryXml(prof_xml):
+            for node in prof_xml.getElementsByTagName("category"):
+                if node.nodeName == "category" and node.getAttribute("name") == category:
+                    result = node.toxml()
+                    prof_xml.unlink()
+                    return result
+
+            prof_xml.unlink()
+            return "<category />"
+
+        d = self.__constructProfileXml(security_limit, app, profile)
+        return d.addCallback(returnCategoryXml)
+
+    def _getParamNode(self, name, category, type_="@ALL@"):  # FIXME: is type_ useful ?
+        """Return a node from the param_xml
+        @param name: name of the node
+        @param category: category of the node
+        @type_: keyword for search:
+                                    @ALL@ search everywhere
+                                    @GENERAL@ only search in general type
+                                    @INDIVIDUAL@ only search in individual type
+        @return: a tuple with the node type and the the node, or None if not found"""
+
+        for type_node in self.dom.documentElement.childNodes:
+            if (((type_ == "@ALL@" or type_ == "@GENERAL@") and type_node.nodeName == C.GENERAL)
+                    or ((type_ == "@ALL@" or type_ == "@INDIVIDUAL@") and type_node.nodeName == C.INDIVIDUAL)):
+                for node in type_node.getElementsByTagName('category'):
+                    if node.getAttribute("name") == category:
+                        params = node.getElementsByTagName("param")
+                        for param in params:
+                            if param.getAttribute("name") == name:
+                                return (type_node.nodeName, param)
+        return None
+
+    def getParamsCategories(self):
+        """return the categories availables"""
+        categories = []
+        for cat in self.dom.getElementsByTagName("category"):
+            name = cat.getAttribute("name")
+            if name not in categories:
+                categories.append(cat.getAttribute("name"))
+        return categories
+
+    def setParam(self, name, value, category, security_limit=C.NO_SECURITY_LIMIT, profile_key='@NONE@'):
+        """Set a parameter, return None if the parameter is not in param xml"""
+        #TODO: use different behaviour depending of the data type (e.g. password encrypted)
+        if profile_key != "@NONE@":
+            profile = self.getProfileName(profile_key)
+            if not profile:
+                error(_('Trying to set parameter for an unknown profile'))
+                return  # TODO: throw an error
+
+        node = self._getParamNode(name, category, '@ALL@')
+        if not node:
+            error(_('Requesting an unknown parameter (%(category)s/%(name)s)')
+                  % {'category': category, 'name': name})
+            return
+
+        if not self.checkSecurityLimit(node[1], security_limit):
+            warning(_("Trying to set parameter '%(param)s' in category '%(cat)s' without authorization!!!"
+                          % {'param': name, 'cat': category}))
+            return
+
+        if node[0] == C.GENERAL:
+            self.params_gen[(category, name)] = value
+            self.storage.setGenParam(category, name, value)
+            for profile in self.storage.getProfilesList():
+                if self.host.isConnected(profile):
+                    self.host.bridge.paramUpdate(name, value, category, profile)
+                    self.host.trigger.point("paramUpdateTrigger", name, value, category, node[0], profile)
+            return
+
+        assert (node[0] == C.INDIVIDUAL)
+        assert (profile_key != "@NONE@")
+
+        type_ = node[1].getAttribute("type")
+        if type_ == "button":
+            print "clique", node.toxml()
+        else:
+            if self.host.isConnected(profile):  # key can not exists if profile is not connected
+                self.params[profile][(category, name)] = value
+            self.host.bridge.paramUpdate(name, value, category, profile)
+            self.host.trigger.point("paramUpdateTrigger", name, value, category, node[0], profile)
+            self.storage.setIndParam(category, name, value, profile)
+
+    def checkSecurityLimit(self, node, security_limit):
+        """Check the given node against the given security limit.
+        The value NO_SECURITY_LIMIT (-1) means that everything is allowed.
+        @return: True if this node can be accessed with the given security limit.
+        """
+        if security_limit < 0:
+            return True
+        if node.hasAttribute("security"):
+            if int(node.getAttribute("security")) <= security_limit:
+                return True
+        return False
+
+    def checkApp(self, node, app):
+        """Check the given node against the given app.
+        @param node: parameter node
+        @param app: name of the frontend requesting the parameters, or '' to get all parameters
+        @return: True if this node concerns the given app.
+        """
+        if not app or not node.hasAttribute("app"):
+            return True
+        return node.getAttribute("app") == app