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;;; mastodon-media.el --- Functions for inlining Mastodon media -*- lexical-binding: t -*-
;; Copyright (C) 2017 Johnson Denen
;; Author: Johnson Denen <johnson.denen@gmail.com>
;; Version: 0.7.1
;; Homepage: https://github.com/jdenen/mastodon.el
;; Package-Requires: ((emacs "24.4"))
;; This file is not part of GNU Emacs.
;; This file is part of mastodon.el.
;; mastodon.el is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; mastodon.el is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with mastodon.el. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; mastodon-media.el provides functions for inlining media.
;; Known bug gnutls -12 when trying to access images on some systems.
;; It looks like their may be a version mismatch between the encryption
;; required by the server and client.
;;; Code:
(defgroup mastodon-media nil
"Inline Mastadon media."
:prefix "mastodon-media-"
:group 'mastodon)
(defcustom mastodon-media--avatar-height 30
"Height of the user avatar images (if shown)."
:group 'mastodon-media
:type 'integer)
(defcustom mastodon-media--preview-max-height 250
"Max height of any media attachment preview to be shown."
:group 'mastodon-media
:type 'integer)
(defvar mastodon-media--generic-avatar-data
(base64-decode-string
"iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAACXBIWXMAAAsTAAALEwEAmpwYAAAA
B3RJTUUH4QUIFCg2lVD1hwAAABZ0RVh0Q29tbWVudABHZW5lcmljIGF2YXRhcsyCnMsAAAcGSURB
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ja3iM4u1zw1qwhlfJihI0bfCNhxYe4NSqg3/A862hQAbrdtHAAAAAElFTkSuQmCC")
"The PNG data for a generic 100x100 avatar")
(defvar mastodon-media--generic-broken-image-data
(base64-decode-string
"iVBORw0KGgoAAAANSUhEUgAAAMgAAADICAYAAACtWK6eAAAACXBIWXMAAAsTAAALEwEAmpwYAAAA
B3RJTUUH4QUIFQUVFt+0LQAAABZ0RVh0Q29tbWVudABHZW5lcmljIGF2YXRhcsyCnMsAAAdoSURB
VHja7d1NSFRrAIfx//iB6ZDSMJYVkWEk0ceYFUkkhhQlEUhEg0FlC1eBoRTUwlbRok0TgRQURZAE
FgpjJmFajpK4kggxpXHRQEGWUJZizpy7uPfC5eKiV+dD5zw/mN05jrxnnjnfcxyWZVkCMKc0SXI4
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onErOWsQgEAAAgEIBCAQgEAAAgEIBCAQgEAAEAhAIACBAAQCEAhAIACBAAQCEAhAIAAIBCAQgEAA
AgEIBCAQgEAAAgEIBACBAAQCEAhAIACBAAQCEAhAIACBAAQCgEAAAgEIBCAQgECAxSyNIYitz58/
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ksJ3WSI4LMuyHA7Hgv6IZVmM5D8mJyf1/PlzdXZ2qrOzU8FgcMF/0+126+DBg6qqqlJFRYXS0vhe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")
"The PNG data for a generic 200x200 'broken image' view")
(defun mastodon-media--process-image-response (status-plist marker image-options region-length)
"Callback function processing the url retrieve response for URL.
STATUS-PLIST is the usual plist of status events as per `url-retrieve'.
IMAGE-OPTIONS are the precomputed options to apply to the image.
MARKER is the marker to where the response should be visible.
REGION-LENGTH is the length of the region that should be replaced with the image.
"
(let ((url-buffer (current-buffer))
(is-error-response-p (eq :error (car status-plist))))
(unwind-protect
(let* ((data (unless is-error-response-p
(goto-char (point-min))
(search-forward "\n\n")
(buffer-substring (point) (point-max))))
(image (when data
(apply #'create-image data (when image-options 'imagemagick)
t image-options))))
(switch-to-buffer (marker-buffer marker))
;; Save narrowing in our buffer
(let ((inhibit-read-only t))
(save-restriction
(widen)
(put-text-property marker (+ marker region-length) 'media-state 'loaded)
(when image
;; We only set the image to display if we could load
;; it; we already have set a default image when we
;; added the tag.
(put-text-property marker (+ marker region-length)
'display image))
;; We are done with the marker; release it:
(set-marker marker nil)))
(kill-buffer url-buffer)))))
(defun mastodon-media--load-image-from-url (url media-type start region-length)
"Takes a URL and MEDIA-TYPE and load the image asynchronously.
MEDIA-TYPE is a symbol and either 'avatar or 'media-link."
;; TODO: Cache the avatars
(let ((image-options (when (image-type-available-p 'imagemagick)
(cond
((eq media-type 'avatar)
`(:height ,mastodon-media--avatar-height))
((eq media-type 'media-link)
`(:max-height ,mastodon-media--preview-max-height))))))
(let ((buffer (current-buffer))
(marker (copy-marker start)))
(condition-case nil
;; catch any errors in url-retrieve so as to not abort
;; whatever called us
(url-retrieve url
#'mastodon-media--process-image-response
(list marker image-options region-length))
(error (with-current-buffer buffer
;; TODO: Consider adding retries
(put-text-property marker (+ marker region-length) 'media-state 'loading-failed)
:loading-failed))))))
(defun mastodon-media--select-next-media-line ()
"Find coordinates of the next media to load.
Returns the list of (`start' . `end', `media-symbol') points of
that line and string found or nil no more media links were
found."
(let ((next-pos (point)))
(while (and (setq next-pos (next-single-property-change next-pos 'media-state))
(or (not (eq 'needs-loading (get-text-property next-pos 'media-state)))
(null (get-text-property next-pos 'media-url))
(null (get-text-property next-pos 'media-type))))
;; do nothing - the loop will proceed
)
(when next-pos
(let ((media-type (get-text-property next-pos 'media-type)))
(cond
;; Avatars are just one character in the buffer
((eq media-type 'avatar)
(list next-pos (+ next-pos 1) 'avatar))
;; Media links are 5 character ("[img]")
((eq media-type 'media-link)
(list next-pos (+ next-pos 5) 'media-link)))))))
(defun mastodon-media--valid-link-p (link)
"Checks to make sure that the missing string has
not been returned."
(and link
(> (length link) 8)
(or (string= "http://" (substring link 0 7))
(string= "https://" (substring link 0 8)))))
(defun mastodon-media--inline-images ()
"Find all `Media_Links:' in the buffer replacing them with the referenced image."
(interactive)
(goto-char (point-min))
(let (line-details)
(while (setq line-details (mastodon-media--select-next-media-line))
(let* ((start (car line-details))
(end (cadr line-details))
(media-type (cadr (cdr line-details)))
(image-url (get-text-property start 'media-url)))
(if (not (mastodon-media--valid-link-p image-url))
;; mark it at least as not needing loading any more
(put-text-property start end 'media-state 'invalid-url)
;; proceed to load this image asynchronously
(put-text-property start end 'media-state 'loading)
(mastodon-media--load-image-from-url image-url media-type start (- end start)))))))
(defun mastodon-media--get-avatar-rendering (avatar-url)
"Returns the string to be written that renders the avatar at AVATAR-URL."
;; We use just an empty space as the textual representation.
;; This is what a user will see on a non-graphical display
;; where not showing an avatar at all is preferable.
(let ((image-options (when (image-type-available-p 'imagemagick)
`(:height ,mastodon-media--avatar-height))))
(concat
(propertize " "
'media-url avatar-url
'media-state 'needs-loading
'media-type 'avatar
'display (apply #'create-image mastodon-media--generic-avatar-data
(when image-options 'imagemagick)
t image-options))
" ")))
(defun mastodon-media--get-media-link-rendering (media-url)
"Returns the string to be written that renders the image at MEDIA-URL."
(concat
(propertize "[img]"
'media-url media-url
'media-state 'needs-loading
'media-type 'media-link
'display (create-image mastodon-media--generic-broken-image-data nil t))
" "))
(provide 'mastodon-media)
;;; mastodon-media.el ends here
|
