[unmaintained] A WhatsApp (Web) transport for XMPP.
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;;;; Handling media uploading / downloading
(in-package :whatsxmpp)
(defun squonch-image-to-jpeg-thumbnail (opticl-image)
"Resize the provided OPTICL-IMAGE to a small 640x480 thumbnail and return an octet vector of JPEG data for this thumbnail."
(check-type opticl-image opticl:image)
(let* ((image-out-stream (flexi-streams:make-in-memory-output-stream))
(resized-image (opticl:resize-image opticl-image 480 640))
(useless (opticl:write-jpeg-stream image-out-stream resized-image)) ; squonch
(image-thumbnail (flexi-streams:get-output-stream-sequence image-out-stream)))
(declare (ignore useless))
(concatenate '(vector (unsigned-byte 8)) image-thumbnail)))
(defun maybe-upload-whatsapp-media (conn media-url)
"If the media at MEDIA-URL can be sent natively as a WhatsApp upload, download it and re-host it on WhatsApp.
Returns a promise that resolves with either a STRING (if the media could not be rehosted or is ineligible) or WHATSCL:MESSAGE-CONTENTS-IMAGE (if the media pointed to is an image and it's been successfully re-uploaded)."
(check-type media-url string)
(let ((opticl-function (opticl::get-image-stream-reader (pathname-type media-url))))
(if opticl-function
(download-remote-media media-url)
(lambda (media-data)
(let* ((image-stream (flexi-streams:make-in-memory-input-stream media-data))
(image-mime (or (trivial-mimes:mime-lookup media-url)
(error "Couldn't guess image MIME type for ~A" media-url)))
(parsed-image (funcall opticl-function image-stream))
(squonched-image (squonch-image-to-jpeg-thumbnail parsed-image)))
(opticl:with-image-bounds (image-y image-x) parsed-image
(put-whatsapp-media-file conn media-data :image image-mime)
(lambda (file-info)
(make-instance 'whatscl::message-contents-image
:file-info file-info
:width-px image-x
:height-px image-y
:jpeg-thumbnail squonched-image)))))))
(promisify media-url))))
(defun download-remote-media (media-url)
"Returns a promise that downloads the remote MEDIA-URL and resolves with an octet vector of the downloaded data."
;; FIXME FIXME FIXME: this function is a trivial DoS vector, if you provide an infinite file like time.gif,
;; or a file that's like 1GB.
(check-type media-url string)
(with-promise-from-thread ()
(format *debug-io* "~&downloading remote media: ~A~%" media-url)
(multiple-value-bind (response status-code)
(drakma:http-request media-url
:force-binary t)
(unless (eql status-code 200)
(format *error-output* "~&downloading failed! status ~A~%" status-code)
(error "Remote media download failed with status code ~A~~%%" status-code))
(check-type response (simple-array (unsigned-byte 8)))
(format *debug-io* "~&downloaded ~A (length: ~A)~%" media-url (length response))
(defun put-whatsapp-media-file (conn file-data media-type mime-type)
"Encrypts and uploads FILE-DATA (an octet vector), a WhatsApp media file of type MEDIA-TYPE (one of :IMAGE, :VIDEO, :AUDIO, or :DOCUMENT) to WhatsApp, returning a promise that resolves with a WHATSCL:FILE-INFO when done."
(check-type file-data (simple-array (unsigned-byte 8)))
(check-type media-type (member :image :video :audio :document))
(with-promise (resolve reject)
(format *debug-io* "~&requesting WhatsApp upload slot~%")
(lambda (conn auth-token ttl hosts)
(declare (ignore conn))
(if auth-token
(resolve auth-token ttl hosts)
(reject (make-condition 'error
"WhatsApp upload slot request rejected"))))))
(lambda (auth-token ttl hosts)
(declare (ignore ttl))
(with-promise-from-thread ()
(multiple-value-bind (encrypted-blob media-key file-sha256 file-enc-sha256)
(whatscl::encrypt-media-data file-data media-type)
(let* ((token (qbase64:encode-bytes file-enc-sha256 :scheme :uri))
(url-to-use (format nil "https://~A/mms/~(~A~)/~A"
(first hosts) (symbol-name media-type) token))
(headers `(("Origin" . "https://web.whatsapp.com")
("Referer" . "https://web.whatsapp.com")))
(qs-params `(("auth" . ,auth-token) ("token" . ,token))))
(format *debug-io* "~&uploading encrypted media file (length ~A) to ~A"
(length encrypted-blob) url-to-use)
(multiple-value-bind (response status-code)
(drakma:http-request url-to-use
:method :post
:content encrypted-blob
:content-type "application/octet-stream"
:parameters qs-params
:additional-headers headers)
(let ((response (babel:octets-to-string response)))
(unless (eql status-code 200)
(format *debug-io* "~&whatsapp upload failed! status ~A / ~A" status-code response)
(error "Downloading media failed with status ~A / ~A" status-code response))
(let* ((json-response (cl-json:decode-json-from-string response))
(url (or (whatscl::cassoc :url json-response)
(error "No :URL field in upload response ~A" json-response))))
(format *debug-io* "~&got whatsapp uploaded media url ~A~%" url)
(make-instance 'whatscl::file-info
:media-key media-key
:url (pb:string-field url)
:sha256 file-sha256
:enc-sha256 file-enc-sha256
:length-bytes (length encrypted-blob)
:mime-type (pb:string-field mime-type)))))))))))
(defun upload-whatsapp-media-file (comp file-info media-type &optional filename)
"Downloads the WhatsApp media file specified by FILE-INFO, uploads it via COMP, and returns a promise which resolves to the URL of the uploaded media.
MEDIA-TYPE is one of (:image :video :audio :document)."
(declare (type (member :image :video :audio :document) media-type))
(with-component-data-lock (comp)
(with-accessors ((url whatscl::file-info-url)
(mime-type whatscl::file-info-mime-type)
(sha256 whatscl::file-info-sha256)
(enc-sha256 whatscl::file-info-enc-sha256)
(length-bytes whatscl::file-info-length-bytes)
(media-key whatscl::file-info-media-key))
(let* ((mime-type (first (uiop:split-string mime-type :separator ";")))
(extension (or (mimes:mime-file-type mime-type) "what"))
(filename (or filename
(concatenate 'string (octets-to-lowercase-hex sha256) "." extension))))
(format *debug-io* "~&requesting an upload slot for whatsapp media (type ~A, length ~A): ~A~%" mime-type length-bytes filename)
(request-http-upload-slot comp (component-upload-component-name comp)
filename length-bytes mime-type)
(lambda (slot)
(destructuring-bind ((put-url . headers) get-url) slot
(format *debug-io* "~&got put-url: ~A~% get-url: ~A~%" put-url get-url)
(with-promise-from-thread ()
(format *debug-io* "~&fetching whatsapp media url: ~A~%" url)
(multiple-value-bind (file-data status-code)
(drakma:http-request url)
(unless (eql status-code 200)
(format *debug-io* "~&couldn't fetch whatsapp media! status ~A, body ~A~%" status-code file-data)
(error "Downloading media failed with status ~A" status-code))
(format *debug-io* "~&got ~A bytes, decrypting~%" (length file-data))
(let ((sha256-expected (ironclad:digest-sequence :sha256 file-data))
(decrypted-file (whatscl::decrypt-media-data media-key file-data media-type)))
(unless (equalp enc-sha256 sha256-expected)
(error "Encrypted SHA256 mismatch"))
(multiple-value-bind (body status-code)
(drakma:http-request put-url
:additional-headers headers
:content-length (length decrypted-file)
:content-type mime-type
:method :put
:content decrypted-file)
(unless (and (>= status-code 200) (< status-code 300))
(format *debug-io* "~&upload failed! status ~A, body ~A~%" status-code body)
(error "HTTP upload failed with status ~A" status-code))
(defun send-qrcode (comp jid text)
"Send a QR code containing TEXT to JID."
(with-component-data-lock (comp)
(uiop:with-temporary-file (:stream stream
:pathname path
:keep t) ; Needed because async
(format *debug-io* "~&using path ~A~%" path)
(cl-qrencode:encode-png-stream text stream)
(force-output stream) ; otherwise the QR codes get chopped off?
(let ((content-length (file-length stream)))
(request-http-upload-slot comp (component-upload-component-name comp)
(file-length stream)
(lambda (slot)
(with-promise-from-thread ()
(destructuring-bind ((put-url . headers) get-url) slot
(format *debug-io* "~&got put-url: ~A~% get-url: ~A~%" put-url get-url)
(multiple-value-bind (body status-code)
(drakma:http-request put-url
:additional-headers headers
:content-type "image/png"
:content-length content-length
:method :put
:content path)
(unless (and (>= status-code 200) (< status-code 300))
(format *debug-io* "~&upload failed! status ~A, body ~A~%" status-code body)
(error "HTTP upload failed with status ~A" status-code))
(with-component-data-lock (comp)
(let ((ajid (admin-jid comp)))
(admin-msg comp jid "WhatsApp Web registration: Scan the following QR code with your device! (Menu -> WhatsApp Web)")
(with-message (comp jid :from ajid)
(cxml:with-element "body"
(cxml:text get-url))
(cxml:with-element "x"
(cxml:attribute "xmlns" +oob-ns+)
(cxml:with-element "url"
(cxml:text get-url))))
(admin-msg comp jid "(Code expired? Be faster next time. Get a new one with `connect`.)")))))))))
(t (e)
(admin-msg comp jid (format nil "Failed to upload QR code!~%Report the following error to the bridge admin: `~A`" e)))))))