Package xmpp :: Module browser

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# Source Code for Module xmpp.browser

      1  ##   browser.py
      2  ##
      3  ##   Copyright (C) 2004 Alexey "Snake" Nezhdanov
      4  ##
      5  ##   This program is free software; you can redistribute it and/or modify
      6  ##   it under the terms of the GNU General Public License as published by
      7  ##   the Free Software Foundation; either version 2, or (at your option)
      8  ##   any later version.
      9  ##
     10  ##   This program is distributed in the hope that it will be useful,
     11  ##   but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  ##   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13  ##   GNU General Public License for more details.
     14
     15  # $Id: browser.py,v 1.12 2007/05/13 17:55:14 normanr Exp $
     16
     17  """Browser module provides DISCO server framework for your application.
     18  This functionality can be used for very different purposes - from publishing
     19  software version and supported features to building of "jabber site" that users
     20  can navigate with their disco browsers and interact with active content.
     21
     22  Such functionality is achieved via registering "DISCO handlers" that are
     23  automatically called when user requests some node of your disco tree.
     24  """
     25
     26  from dispatcher import *
     27  from client import PlugIn
     28
     29 -class Browser(PlugIn):
     30      """ WARNING! This class is for components only. It will not work in client mode!
     31
     32          Standart xmpppy class that is ancestor of PlugIn and can be attached
     33          to your application.
     34          All processing will be performed in the handlers registered in the browser
     35          instance. You can register any number of handlers ensuring that for each
     36          node/jid combination only one (or none) handler registered.
     37          You can register static information or the fully-blown function that will
     38          calculate the answer dynamically.
     39          Example of static info (see JEP-0030, examples 13-14):
     40          # cl - your xmpppy connection instance.
     41          b=xmpp.browser.Browser()
     42          b.PlugIn(cl)
     43          items=[]
     44          item={}
     45          item['jid']='catalog.shakespeare.lit'
     46          item['node']='books'
     47          item['name']='Books by and about Shakespeare'
     48          items.append(item)
     49          item={}
     50          item['jid']='catalog.shakespeare.lit'
     51          item['node']='clothing'
     52          item['name']='Wear your literary taste with pride'
     53          items.append(item)
     54          item={}
     55          item['jid']='catalog.shakespeare.lit'
     56          item['node']='music'
     57          item['name']='Music from the time of Shakespeare'
     58          items.append(item)
     59          info={'ids':[], 'features':[]}
     60          b.setDiscoHandler({'items':items,'info':info})
     61
     62          items should be a list of item elements.
     63          every item element can have any of these four keys: 'jid', 'node', 'name', 'action'
     64          info should be a dicionary and must have keys 'ids' and 'features'.
     65          Both of them should be lists:
     66              ids is a list of dictionaries and features is a list of text strings.
     67          Example (see JEP-0030, examples 1-2)
     68          # cl - your xmpppy connection instance.
     69          b=xmpp.browser.Browser()
     70          b.PlugIn(cl)
     71          items=[]
     72          ids=[]
     73          ids.append({'category':'conference','type':'text','name':'Play-Specific Chatrooms'})
     74          ids.append({'category':'directory','type':'chatroom','name':'Play-Specific Chatrooms'})
     75          features=[NS_DISCO_INFO,NS_DISCO_ITEMS,NS_MUC,NS_REGISTER,NS_SEARCH,NS_TIME,NS_VERSION]
     76          info={'ids':ids,'features':features}
     77          # info['xdata']=xmpp.protocol.DataForm() # JEP-0128
     78          b.setDiscoHandler({'items':[],'info':info})
     79      """
     80 -    def __init__(self):
     81          """Initialises internal variables. Used internally."""
     82          PlugIn.__init__(self)
     83          DBG_LINE='browser'
     84          self._exported_methods=[]
     85          self._handlers={'':{}}
     86
     87 -    def plugin(self, owner):
     88          """ Registers it's own iq handlers in your application dispatcher instance.
     89              Used internally."""
     90          owner.RegisterHandler('iq',self._DiscoveryHandler,typ='get',ns=NS_DISCO_INFO)
     91          owner.RegisterHandler('iq',self._DiscoveryHandler,typ='get',ns=NS_DISCO_ITEMS)
     92
     93 -    def plugout(self):
     94          """ Unregisters browser's iq handlers from your application dispatcher instance.
     95              Used internally."""
     96          self._owner.UnregisterHandler('iq',self._DiscoveryHandler,typ='get',ns=NS_DISCO_INFO)
     97          self._owner.UnregisterHandler('iq',self._DiscoveryHandler,typ='get',ns=NS_DISCO_ITEMS)
     98
     99 -    def _traversePath(self,node,jid,set=0):
    100          """ Returns dictionary and key or None,None
    101              None - root node (w/o "node" attribute)
    102              /a/b/c - node
    103              /a/b/  - branch
    104              Set returns '' or None as the key
    105              get returns '' or None as the key or None as the dict.
    106              Used internally."""
    107          if self._handlers.has_key(jid): cur=self._handlers[jid]
    108          elif set:
    109              self._handlers[jid]={}
    110              cur=self._handlers[jid]
    111          else: cur=self._handlers['']
    112          if node is None: node=[None]
    113          else: node=node.replace('/',' /').split('/')
    114          for i in node:
    115              if i<>'' and cur.has_key(i): cur=cur[i]
    116              elif set and i<>'': cur[i]={dict:cur,str:i}; cur=cur[i]
    117              elif set or cur.has_key(''): return cur,''
    118              else: return None,None
    119          if cur.has_key(1) or set: return cur,1
    120          raise "Corrupted data"
    121
    122 -    def setDiscoHandler(self,handler,node='',jid=''):
    123          """ This is the main method that you will use in this class.
    124              It is used to register supplied DISCO handler (or dictionary with static info)
    125              as handler of some disco tree branch.
    126              If you do not specify the node this handler will be used for all queried nodes.
    127              If you do not specify the jid this handler will be used for all queried JIDs.
    128
    129              Usage:
    130              cl.Browser.setDiscoHandler(someDict,node,jid)
    131              or
    132              cl.Browser.setDiscoHandler(someDISCOHandler,node,jid)
    133              where
    134
    135              someDict={
    136                  'items':[
    137                            {'jid':'jid1','action':'action1','node':'node1','name':'name1'},
    138                            {'jid':'jid2','action':'action2','node':'node2','name':'name2'},
    139                            {'jid':'jid3','node':'node3','name':'name3'},
    140                            {'jid':'jid4','node':'node4'}
    141                          ],
    142                  'info' :{
    143                            'ids':[
    144                                    {'category':'category1','type':'type1','name':'name1'},
    145                                    {'category':'category2','type':'type2','name':'name2'},
    146                                    {'category':'category3','type':'type3','name':'name3'},
    147                                  ],
    148                            'features':['feature1','feature2','feature3','feature4'],
    149                            'xdata':DataForm
    150                          }
    151                       }
    152
    153              and/or
    154
    155              def someDISCOHandler(session,request,TYR):
    156                  # if TYR=='items':  # returns items list of the same format as shown above
    157                  # elif TYR=='info': # returns info dictionary of the same format as shown above
    158                  # else: # this case is impossible for now.
    159          """
    160          self.DEBUG('Registering handler %s for "%s" node->%s'%(handler,jid,node), 'info')
    161          node,key=self._traversePath(node,jid,1)
    162          node[key]=handler
    163
    164 -    def getDiscoHandler(self,node='',jid=''):
    165          """ Returns the previously registered DISCO handler
    166              that is resonsible for this node/jid combination.
    167              Used internally."""
    168          node,key=self._traversePath(node,jid)
    169          if node: return node[key]
    170
    171 -    def delDiscoHandler(self,node='',jid=''):
    172          """ Unregisters DISCO handler that is resonsible for this
    173              node/jid combination. When handler is unregistered the branch
    174              is handled in the same way that it's parent branch from this moment.
    175          """
    176          node,key=self._traversePath(node,jid)
    177          if node:
    178              handler=node[key]
    179              del node[dict][node[str]]
    180              return handler
    181
    182 -    def _DiscoveryHandler(self,conn,request):
    183          """ Servers DISCO iq request from the remote client.
    184              Automatically determines the best handler to use and calls it
    185              to handle the request. Used internally.
    186          """
    187          node=request.getQuerynode()
    188          if node:
    189              nodestr=node
    190          else:
    191              nodestr='None'
    192          handler=self.getDiscoHandler(node,request.getTo())
    193          if not handler:
    194              self.DEBUG("No Handler for request with jid->%s node->%s ns->%s"%(request.getTo().__str__().encode('utf8'),nodestr.encode('utf8'),request.getQueryNS().encode('utf8')),'error')
    195              conn.send(Error(request,ERR_ITEM_NOT_FOUND))
    196              raise NodeProcessed
    197          self.DEBUG("Handling request with jid->%s node->%s ns->%s"%(request.getTo().__str__().encode('utf8'),nodestr.encode('utf8'),request.getQueryNS().encode('utf8')),'ok')
    198          rep=request.buildReply('result')
    199          if node: rep.setQuerynode(node)
    200          q=rep.getTag('query')
    201          if request.getQueryNS()==NS_DISCO_ITEMS:
    202              # handler must return list: [{jid,action,node,name}]
    203              if type(handler)==dict: lst=handler['items']
    204              else: lst=handler(conn,request,'items')
    205              if lst==None:
    206                  conn.send(Error(request,ERR_ITEM_NOT_FOUND))
    207                  raise NodeProcessed
    208              for item in lst: q.addChild('item',item)
    209          elif request.getQueryNS()==NS_DISCO_INFO:
    210              if type(handler)==dict: dt=handler['info']
    211              else: dt=handler(conn,request,'info')
    212              if dt==None:
    213                  conn.send(Error(request,ERR_ITEM_NOT_FOUND))
    214                  raise NodeProcessed
    215              # handler must return dictionary:
    216              # {'ids':[{},{},{},{}], 'features':[fe,at,ur,es], 'xdata':DataForm}
    217              for id in dt['ids']: q.addChild('identity',id)
    218              for feature in dt['features']: q.addChild('feature',{'var':feature})
    219              if dt.has_key('xdata'): q.addChild(node=dt['xdata'])
    220          conn.send(rep)
    221          raise NodeProcessed
    222