224 lines
9 KiB
Common Lisp
224 lines
9 KiB
Common Lisp
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(defpackage :whatsxmpp
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(:use :cl :usocket :event-emitter))
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(in-package :whatsxmpp)
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(defvar *last-stanza*)
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(defparameter +streams-ns+ "urn:ietf:params:xml:ns:xmpp-streams")
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(defparameter +component-ns+ "jabber:component:accept")
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(defclass xmpp-component (event-emitter)
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((socket
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:initarg :socket
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:accessor component-socket)
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(socket-lock
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:initform (bt:make-recursive-lock)
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:accessor component-socket-lock)
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(data-lock
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:initform (bt:make-recursive-lock)
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:accessor component-data-lock)
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(sink
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:initarg :sink
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:accessor component-sink)
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(name
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:initarg :name
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:reader component-name)
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(stream-id
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:initform nil
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:accessor component-stream-id)
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(shared-secret
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:initarg :shared-secret
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:reader component-shared-secret)))
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(defmacro with-component-data-lock (comp &body body)
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`(bt:with-recursive-lock-held ((component-data-lock ,comp))
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,@body))
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(defmethod sax:start-document ((s start-ignoring-sink))
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(declare (ignore s)))
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(defclass xmpp-source (cxml:broadcast-handler)
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((component
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:initarg :component
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:accessor source-component)
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(depth
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:initform 0
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:accessor source-depth)))
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(defun make-xmpp-source (comp)
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(let ((ret (cxml:make-broadcast-handler)))
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(change-class ret 'xmpp-source
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:component comp)
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ret))
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(defmethod sax:start-document ((s xmpp-source))
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(declare (ignore s))
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(format *debug-io* "~&XMPP --> [document started]~%"))
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(defmethod sax:start-element ((s xmpp-source) namespace-uri local-name qname attributes)
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(with-accessors ((depth source-depth) (comp source-component) (handlers cxml:broadcast-handler-handlers)) s
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(incf depth)
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(when (and (eql depth 1) (equal qname "stream:stream"))
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(flet ((local-name-is-id (attr)
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(equal (sax:attribute-local-name attr) "id")))
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(let ((stream-id-attr (find-if #'local-name-is-id attributes)))
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(when (not stream-id-attr)
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(error "Server didn't send a stream ID"))
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(format *debug-io* "~&XMPP --> [stream started, ID ~A]~%" (sax:attribute-value stream-id-attr))
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(with-component-data-lock comp
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(setf (component-stream-id comp) (sax:attribute-value stream-id-attr))
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(emit :stream-started comp))
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(return-from sax:start-element))))
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(when (eql depth 2)
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(let ((dom-builder (cxml-dom:make-dom-builder)))
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(format *debug-io* "~&XMPP --> ")
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(setf handlers (list (cxml:make-character-stream-sink *debug-io*) dom-builder))
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(sax:start-document dom-builder)))
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(call-next-method s namespace-uri local-name qname attributes)))
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(defmethod sax:end-element :before ((s xmpp-source) namespace-uri local-name qname)
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(when (equal qname "stream:stream")
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(error "Server closed the stream")))
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(defmethod sax:end-element :after ((s xmpp-source) namespace-uri local-name qname)
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(with-accessors ((depth source-depth) (comp source-component) (handlers cxml:broadcast-handler-handlers)) s
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(decf depth)
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(when (eql depth 1)
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(let* ((debug-sink (first handlers))
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(dom-builder (second handlers))
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(stanza (sax:end-document dom-builder)))
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(sax:end-document debug-sink)
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(terpri *debug-io*)
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(setf handlers nil)
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(emit :raw-stanza comp stanza)))))
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(defclass xmpp-sink (cxml:broadcast-handler)
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((sink-open
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:initform t
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:accessor sink-open)))
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(defmethod sax:start-document ((s xmpp-sink))
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(declare (ignore s))
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(format *debug-io* "~&XMPP <-- "))
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(defmethod sax:end-element ((s xmpp-sink) namespace-uri local-name qname)
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(if (and (sink-open s) (equal local-name "stream"))
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;; The <stream:stream> element gets opened at the start of the connection
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;; and closing it represents ending the connection. We therefore don't
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;; want to close it...
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;; Instead, send some empty characters to get the sinks to write the last ">"
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;; bit of the opening tag.
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(sax:characters s "")
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(call-next-method s namespace-uri local-name qname))
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(terpri *debug-io*))
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(defun close-xmpp-component (comp)
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(bt:with-recursive-lock-held ((component-socket-lock comp))
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(setf (sink-open (component-sink comp)) nil)
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(write-sequence (babel:string-to-octets "</stream:stream>"
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:encoding :utf-8)
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(component-socket comp))
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(force-output (component-socket comp))
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(close (component-socket comp))))
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(defun make-xmpp-sink (socket)
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(let ((ret (cxml:make-broadcast-handler
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(cxml:make-character-stream-sink *debug-io*)
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(cxml:make-octet-stream-sink socket))))
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(change-class ret 'xmpp-sink)
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ret))
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(defmacro with-dom-xml-output (&body body)
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`(cxml:with-xml-output (cxml-dom:make-dom-builder)
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,@body))
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(defun component-listen-thread (comp)
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"Listening thread for an XMPP component: constantly reads from the socket and emits new stanzas."
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(format *debug-io* "Starting component listening thread~%")
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;; ### Story time! ###
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;; So I spent an hour debugging why this wasn't working.
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;; And, long story short, if you just call CXML:PARSE with a stream
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;; it gets converted into an 'xstream' inside CXML, which has a :SPEED
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;; property. This :SPEED property controls how many bytes it tries to buffer
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;; before actually doing the parsing and the goddamn default is 8192 (!!).
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;; This obviously ain't gonna fly for our TCP socket, because the initial stream
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;; start element is less than 8192 bytes. So we make our own stupid xstream
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;; and specify the speed manually, and then it works.
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;;
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;; Wouldn't it be nice if people documented this sort of thing?
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(let ((source (make-xmpp-source comp))
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(fucking-stream (cxml:make-xstream (component-socket comp)
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:speed 1 ; FFFFFFFFUUUUUUUU
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:initial-speed 1)))
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(cxml:parse fucking-stream source
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:recode t)))
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(defmacro with-component-xml-output (comp &rest body)
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`(with-accessors ((lock component-socket-lock) (socket component-socket) (sink component-sink))
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,comp
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(bt:with-recursive-lock-held (lock)
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(cxml:with-xml-output sink
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,@body)
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(force-output socket))))
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(defun write-stream-header (comp)
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(with-component-data-lock comp
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(with-component-xml-output comp
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(cxml:with-namespace ("stream" "http://etherx.jabber.org/streams")
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(cxml:with-element "stream:stream"
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(cxml:attribute "xmlns" +component-ns+)
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(cxml:attribute "to" (component-name comp)))))))
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(defun component-stream-started (comp)
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(with-component-data-lock comp
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(with-component-xml-output comp
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(cxml:with-element "handshake"
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(cxml:attribute "xmlns" +component-ns+)
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(cxml:text (string-downcase (sha1:sha1-hex (concatenate 'string (component-stream-id comp) (component-shared-secret comp)))))))))
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(defun handle-stream-error (comp stanza)
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(flet ((is-error-node (node)
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(equal (dom:namespace-uri node) +streams-ns+))
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(is-text-node (node)
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(equal (dom:tag-name node) "text")))
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(let* ((children (dom:child-nodes stanza))
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(error-node (find-if #'is-error-node children))
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(error-text-node (find-if #'is-text-node children))
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(error-name (dom:tag-name error-node))
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(error-text (when error-text-node
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(dom:node-value (elt (dom:child-nodes error-text-node) 0)))))
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(warn "Stream error of type ~A encountered: ~A" error-name error-text)
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(emit :stream-error comp error-name error-text stanza))))
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(defun handle-connection-complete (comp)
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(declare (ignore comp))
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(format *debug-io* "Connection complete! \o/"))
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(defun component-stanza (comp stanza)
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(setf *last-stanza* stanza)
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(let* ((stanza (dom:document-element stanza))
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(tag-name (dom:tag-name stanza)))
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(cond
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((equal tag-name "stream:error") (handle-stream-error comp stanza))
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((equal tag-name "handshake") (handle-connection-complete comp))
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(t (emit :stanza comp stanza)))))
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(defun make-component (server port shared-secret name)
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"Make a new XMPP component, connecting to SERVER on PORT with SHARED-SECRET."
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(let* ((socket (socket-stream
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(socket-connect server port
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:element-type '(unsigned-byte 8))))
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(component (make-instance 'xmpp-component
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:socket socket
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:sink (make-xmpp-sink socket)
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:name name
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:shared-secret shared-secret)))
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(bt:make-thread (lambda ()
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(component-listen-thread component))
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:name "XMPP component listen thread")
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(on :stream-started component (lambda ()
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(component-stream-started component)))
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(on :raw-stanza component (lambda (stanza)
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(component-stanza component stanza)))
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(write-stream-header component)
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component))
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