From 2ca3e65b147645c3278004571313437b8e85e9e5 Mon Sep 17 00:00:00 2001
From: mousebot <mousebot@riseup.net>
Date: Fri, 22 Oct 2021 18:28:30 +0200
Subject: handle caching of images

we now store images ourselves for caching rather than relying on
url-automatic-caching.
---
 lisp/mastodon-media.el | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

(limited to 'lisp/mastodon-media.el')

diff --git a/lisp/mastodon-media.el b/lisp/mastodon-media.el
index a401de5..28fbd19 100644
--- a/lisp/mastodon-media.el
+++ b/lisp/mastodon-media.el
@@ -135,7 +135,7 @@ fKRJkmVZjAQwh78A6vCRWJE8K+8AAAAASUVORK5CYII=")
   "The PNG data for a generic 200x200 'broken image' view.")
 
 (defun mastodon-media--process-image-response
-    (status-plist marker image-options region-length)
+    (status-plist marker image-options region-length url)
   "Callback function processing the url retrieve response for URL.
 
 STATUS-PLIST is the usual plist of status events as per `url-retrieve'.
@@ -156,6 +156,8 @@ REGION-LENGTH is the length of the region that should be replaced with the image
                                      (when image-options 'imagemagick)
                                    nil) ; inbuilt scaling in 27.1
                                  t image-options))))
+            (unless (url-is-cached url) ; cache image if not already cached
+              (url-store-in-cache url-buffer))
             (with-current-buffer (marker-buffer marker)
               ;; Save narrowing in our buffer
               (let ((inhibit-read-only t))
@@ -194,9 +196,17 @@ REGION-LENGTH is the range from start to propertize."
       (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))
+          (if (url-is-cached url)
+              ;; if image url is cached, decompress and use it
+              (with-current-buffer (url-fetch-from-cache url)
+                (set-buffer-multibyte nil)
+                (goto-char (point-min))
+                (zlib-decompress-region (goto-char (search-forward "\n\n")) (point-max))
+                (mastodon-media--process-image-response nil marker image-options region-length url))
+            ;; else fetch as usual and process-image-response will cache it
+            (url-retrieve url
+                          #'mastodon-media--process-image-response
+                          (list marker image-options region-length url)))
         (error (with-current-buffer buffer
                  ;; TODO: Consider adding retries
                  (put-text-property marker
-- 
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