Add function for uploading (but not sending) media, clean up threads
- The new PUT-WHATSAPP-MEDIA-FILE can encrypt and upload a blob of file data to
WhatsApp, and returns everything we'd need to make a protobuf message out of
that.
- However, important functionality is still absent: whatscl needs to gain some
support for sending protobuf messages for file uploads, and we'd also need to
integrate with some image/video libraries in order to do related processing
tasks.
- For example, uploading an image requires producing a JPEG thumbnail for it,
as well as figuring out its size.
- Uploading audio would require conversion to Opus.
- Maybe we could attempt to integrate with ffmpeg or something? This is likely
to get tricky.
This commit is contained in:
eta
parent
efbda1a002
commit
28a6303371
98
stuff.lisp
98
stuff.lisp
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@ -135,6 +135,51 @@ Commands:
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do (handle-setup-user comp user))
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(trivial-timers:schedule-timer (component-reconnect-timer comp) *reconnect-every-secs*))))
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(defun put-whatsapp-media-file (conn file-data media-type)
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"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 (URL MEDIA-KEY FILE-SHA256 FILE-ENC-SHA256 ENCRYPTED-LENGTH) when done."
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(check-type file-data (simple-array (unsigned-byte 8)))
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(check-type media-type (member :image :video :audio :document))
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(attach
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(with-promise (resolve reject)
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(format *debug-io* "~&requesting WhatsApp upload slot~%")
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(whatscl::start-media-upload
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conn
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(lambda (conn auth-token ttl hosts)
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(declare (ignore conn))
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(if auth-token
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(resolve auth-token ttl hosts)
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(reject (make-condition 'error
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"WhatsApp upload slot request rejected"))))))
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(lambda (auth-token ttl hosts)
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(declare (ignore ttl))
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(with-promise-from-thread ()
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(multiple-value-bind (encrypted-blob media-key file-sha256 file-enc-sha256)
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(whatscl::encrypt-media-data file-data media-type)
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(let* ((token (qbase64:encode-bytes file-enc-sha256 :scheme :uri))
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(url-to-use (format nil "https://~A/mms/~(~A~)/~A"
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(first hosts) (symbol-name media-type) token))
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(headers `(("Origin" . "https://web.whatsapp.com")
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("Referer" . "https://web.whatsapp.com")))
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(qs-params `(("auth" . ,auth-token) ("token" . ,token))))
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(format *debug-io* "~&uploading encrypted media file (length ~A) to ~A"
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(length encrypted-blob) url-to-use)
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(multiple-value-bind (response status-code)
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(drakma:http-request url-to-use
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:method :post
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:content encrypted-blob
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:content-type "application/octet-stream"
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:parameters qs-params
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:additional-headers headers)
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(let ((response (babel:octets-to-string response)))
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(unless (eql status-code 200)
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(format *debug-io* "~&whatsapp upload failed! status ~A / ~A" status-code response)
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(error "Downloading media failed with status ~A / ~A" status-code response))
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(let* ((json-response (cl-json:decode-json-from-string response))
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(url (or (whatscl::cassoc :url json-response)
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(error "No :URL field in upload response ~A" json-response))))
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(format *debug-io* "~&got whatsapp uploaded media url ~A~%" url)
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(values url media-key file-sha256 file-enc-sha256 (length encrypted-blob)))))))))))
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(defun upload-whatsapp-media-file (comp file-info media-type &optional filename)
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"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.
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MEDIA-TYPE is one of (:image :video :audio :document)."
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@ -158,35 +203,30 @@ MEDIA-TYPE is one of (:image :video :audio :document)."
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(lambda (slot)
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(destructuring-bind ((put-url . headers) get-url) slot
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(format *debug-io* "~&got put-url: ~A~% get-url: ~A~%" put-url get-url)
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(with-promise (resolve reject)
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(bt:make-thread
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(lambda ()
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(handler-case
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(progn
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(format *debug-io* "~&fetching whatsapp media url: ~A~%" url)
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(multiple-value-bind (file-data status-code)
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(drakma:http-request url)
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(unless (eql status-code 200)
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(format *debug-io* "~&couldn't fetch whatsapp media! status ~A, body ~A~%" status-code file-data)
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(error "Downloading media failed with status ~A" status-code))
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(format *debug-io* "~&got ~A bytes, decrypting~%" (length file-data))
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(let ((sha256-expected (ironclad:digest-sequence :sha256 file-data))
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(decrypted-file (whatscl::decrypt-media-data media-key file-data media-type)))
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(unless (equalp enc-sha256 sha256-expected)
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(error "Encrypted SHA256 mismatch"))
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(multiple-value-bind (body status-code)
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(drakma:http-request put-url
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:additional-headers headers
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:content-length (length decrypted-file)
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:content-type mime-type
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:method :put
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:content decrypted-file)
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(unless (and (>= status-code 200) (< status-code 300))
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(format *debug-io* "~&upload failed! status ~A, body ~A~%" status-code body)
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(error "HTTP upload failed with status ~A" status-code))
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(resolve get-url)))))
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(error (e) (reject e))))
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:name "whatsapp media download thread")))))))))
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(with-promise-from-thread ()
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(format *debug-io* "~&fetching whatsapp media url: ~A~%" url)
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(multiple-value-bind (file-data status-code)
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(drakma:http-request url)
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(unless (eql status-code 200)
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(format *debug-io* "~&couldn't fetch whatsapp media! status ~A, body ~A~%" status-code file-data)
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(error "Downloading media failed with status ~A" status-code))
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(format *debug-io* "~&got ~A bytes, decrypting~%" (length file-data))
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(let ((sha256-expected (ironclad:digest-sequence :sha256 file-data))
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(decrypted-file (whatscl::decrypt-media-data media-key file-data media-type)))
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(unless (equalp enc-sha256 sha256-expected)
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(error "Encrypted SHA256 mismatch"))
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(multiple-value-bind (body status-code)
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(drakma:http-request put-url
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:additional-headers headers
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:content-length (length decrypted-file)
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:content-type mime-type
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:method :put
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:content decrypted-file)
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(unless (and (>= status-code 200) (< status-code 300))
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(format *debug-io* "~&upload failed! status ~A, body ~A~%" status-code body)
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(error "HTTP upload failed with status ~A" status-code))
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get-url))))
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:name "whatsapp media download thread"))))))))
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(defun send-qrcode (comp jid text)
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"Send a QR code containing TEXT to JID."
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11
utils.lisp
11
utils.lisp
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@ -16,3 +16,14 @@
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(defun child-elements (node)
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"Returns the child elements (excluding text nodes) of the CXML DOM node NODE."
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(remove-if-not #'dom:element-p (dom:child-nodes node)))
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(defmacro with-promise-from-thread (() &body forms)
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"Return a promise that executes FORMS in a new thread, resolving the promise with the return value of (PROGN ,@FORMS) or rejecting it if an ERROR condition is thrown (with said condition)."
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(let ((resolve (gensym))
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(reject (gensym)))
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`(with-promise (,resolve ,reject)
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(bt:make-thread
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(lambda ()
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(handler-case
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(,resolve (progn ,@forms))
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(error (e) (,reject e))))))))
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@ -12,6 +12,7 @@
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(:file "xmpp")
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(:file "xep-0030")
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(:file "xep-0363")
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(:file "xep-0115")
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(:file "sqlite")
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(:file "db")
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(:file "stuff")))
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