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XMPP: The Definitive Guide
SleekXMPP was featured in the first edition of the O'Reilly book [[XMPP: The Definitive Guide|http://oreilly.com/catalog/9780596521271/]] by Peter Saint-Andre, Kevin Smith, and Remko Tronçon. The original source code for the book's examples can be found at http://github.com/remko/xmpp-tdg. An updated version of the source code, maintained to stay current with the latest SleekXMPP release, is available at http://github.com/legastero/xmpp-tdg.
However, since publication, SleekXMPP has advanced from version 0.2.1 to version 1.0 and there have been several major API changes. The most notable is the introduction of stanza objects which have simplified and standardized interactions with the XMPP XML stream.
What follows is a walk-through of The Definitive Guide highlighting the changes needed to make the code examples work with version 1.0 of SleekXMPP. These changes have been kept to a minimum to preserve the correlation with the book's explanations, so be aware that some code may not use current best practices.
Example 2-2. Implementation of a basic bot that echoes all incoming messages back to its sender. (Page 26)
The echo bot example requires a change to the handleIncomingMessage method
to reflect the use of the Message stanza object. The
"jid" field of the message object should now be "from" to match the
from attribute of the actual XML message stanza. Likewise, "message"
changes to "body" to match the body element of the message stanza.
def handleIncomingMessage(self, message):
self.xmpp.sendMessage(message["from"], message["body"])View full source | View original code
The main event handling method in the Bot class is meant to process both message
events and presence update events. With the new changes in SleekXMPP 1.0,
extracting a CheshiR status "message" from both types of stanzas
requires accessing different attributes. In the case of a message stanza, the
"body" attribute would contain the CheshiR message. For a presence event,
the information is stored in the "status" attribute. To handle both cases,
we can test the type of the given event object and look up the proper attribute
based on the type.
Like in the EchoBot example, the expression event["jid"] needs to change
to event["from"]> in order to get a JID object for the stanza's sender.
Because other functions in CheshiR assume that the JID is a string, the jid
attribute is used to access the string version of the JID. A check is also added
in case user is None, but the check could (and probably should) be
placed in addMessageFromUser.
Another change is needed in handleMessageAddedToBackend where
an HTML-IM response is created. The HTML content should be enclosed in a single
element, such as a <p> tag.
def handleIncomingXMPPEvent(self, event):
msgLocations = {sleekxmpp.stanza.presence.Presence: "status",
sleekxmpp.stanza.message.Message: "body"}
message = event[msgLocations[type(event)]]
user = self.backend.getUserFromJID(event["from"].jid)
if user is not None:
self.backend.addMessageFromUser(message, user)
def handleMessageAddedToBackend(self, message) :
body = message.user + ": " + message.text
htmlBody = "<p><a href='%(uri)s'>%(user)s</a>: %(message)s</p>" % {
"uri": self.url + "/" + message.user,
"user" : message.user, "message" : message.text }
for subscriberJID in self.backend.getSubscriberJIDs(message.user) :
self.xmpp.sendMessage(subscriberJID, body, mhtml=htmlBody)View full source | View original code
Since the CheshiR examples build on each other, see previous sections for corrections to code that is not marked as new in the book example.
The main difference for the configurable IM bot is the handling for the
data form in handleConfigurationCommand. The test for equality
with the string "1" is no longer required; SleekXMPP converts
boolean data form fields to the values True and False
automatically.
For the method handleIncomingXMPPPresence, the attribute
"jid" is again converted to "from" to get a JID
object for the presence stanza's sender, and the jid attribute is
used to access the string version of that JID object. A check is also added in
case user is None, but the check could (and probably
should) be placed in getShouldMonitorPresenceFromUser.
def handleConfigurationCommand(self, form, sessionId):
values = form.getValues()
monitorPresence =values["monitorPresence"]
jid = self.xmpp.plugin["xep_0050"].sessions[sessionId]["jid"]
user = self.backend.getUserFromJID(jid)
self.backend.setShouldMonitorPresenceFromUser(user, monitorPresence)
def handleIncomingXMPPPresence(self, event):
user = self.backend.getUserFromJID(event["from"].jid)
if user is not None:
if self.backend.getShouldMonitorPresenceFromUser(user):
self.handleIncomingXMPPEvent(event)View full source | View original code
Since the CheshiR examples build on each other, see previous sections for corrections to code that is not marked as new in the book example.
Like several previous examples, a needed change is to replace
subscription["from"] with subscription["from"].jid because the
BaseXMPP method makePresence requires the JID to be a string.
A correction needs to be made in handleXMPPPresenceProbe because a line was
left out of the original implementation; the variable user is undefined. The
JID of the user can be extracted from the presence stanza's from attribute.
Since this implementation of CheshiR uses an XMPP component, it must
include a from attribute in all messages that it sends. Adding the
from attribute is done by including mfrom=self.xmpp.jid in calls to
self.xmpp.sendMessage.
def handleXMPPPresenceProbe(self, event) :
self.xmpp.sendPresence(pto = event["from"])
def handleXMPPPresenceSubscription(self, subscription) :
if subscription["type"] == "subscribe" :
userJID = subscription["from"].jid
self.xmpp.sendPresenceSubscription(pto=userJID, ptype="subscribed")
self.xmpp.sendPresence(pto = userJID)
self.xmpp.sendPresenceSubscription(pto=userJID, ptype="subscribe")
def handleMessageAddedToBackend(self, message) :
body = message.user + ": " + message.text
for subscriberJID in self.backend.getSubscriberJIDs(message.user) :
self.xmpp.sendMessage(subscriberJID, body, mfrom=self.xmpp.jid)View full source | View original code
Since the CheshiR examples build on each other, see previous sections for corrections to code that is not marked as new in the book example.
After applying the changes from Example 14-4 above, the registrable component implementation should work correctly.
Note: To see how to implement in-band registration as a SleekXMPP plugin, see Creating a SleekXMPP Plugin.
View full source | View original code
Since the CheshiR examples build on each other, see previous sections for corrections to code that is not marked as new in the book example.
While the final code example can look daunting with all of the changes
made, it requires very few modifications to work with the latest version of
SleekXMPP. Most differences are the result of CheshiR's backend functions
expecting JIDs to be strings so that they can be stripped to bare JIDs. To
resolve these, use the jid attribute of the JID objects. Also,
references to "message" and "jid" attributes need to
be changed to either "body" or "status", and either
"from" or "to" depending on if the object is a message
or presence stanza and which of the JIDs from the stanza is needed.
def handleIncomingXMPPMessage(self, event) :
message = self.addRecipientToMessage(event["body"], event["to"].jid)
user = self.backend.getUserFromJID(event["from"].jid)
self.backend.addMessageFromUser(message, user)
def handleIncomingXMPPPresence(self, event) :
if event["to"].jid == self.componentDomain :
user = self.backend.getUserFromJID(event["from"].jid)
self.backend.addMessageFromUser(event["status"], user)
...
def handleXMPPPresenceSubscription(self, subscription) :
if subscription["type"] == "subscribe" :
userJID = subscription["from"].jid
user = self.backend.getUserFromJID(userJID)
contactJID = subscription["to"]
self.xmpp.sendPresenceSubscription(
pfrom=contactJID, pto=userJID, ptype="subscribed", pnick=user)
self.sendPresenceOfContactToUser(contactJID=contactJID, userJID=userJID)
if contactJID == self.componentDomain :
self.sendAllContactSubscriptionRequestsToUser(userJID)