[feature] Refetch emojis when they change on remote instances (#905)

* select emoji using image_static_url

* use updated on AP emojis

* allow refetch of updated emojis

* cheeky workaround for test

* clean up old files for refreshed emoji

* check error for originalPostData

* shorten GetEmojiByStaticImageURL

* delete kirby (sorry nintendo)

1 files changed, 18 insertions, 3 deletions

diff --git a/internal/cache/emoji.go b/internal/cache/emoji.go
index eda7583ea..117f5475e 100644
--- a/internal/cache/emoji.go
+++ b/internal/cache/emoji.go
@@ -37,19 +37,26 @@ func NewEmojiCache() *EmojiCache {
 		RegisterLookups: func(lm *cache.LookupMap[string, string]) {
 			lm.RegisterLookup("uri")
 			lm.RegisterLookup("shortcodedomain")
+			lm.RegisterLookup("imagestaticurl")
 		},
 
 		AddLookups: func(lm *cache.LookupMap[string, string], emoji *gtsmodel.Emoji) {
+			lm.Set("shortcodedomain", shortcodeDomainKey(emoji.Shortcode, emoji.Domain), emoji.ID)
 			if uri := emoji.URI; uri != "" {
-				lm.Set("uri", uri, emoji.URI)
-				lm.Set("shortcodedomain", shortcodeDomainKey(emoji.Shortcode, emoji.Domain), emoji.ID)
+				lm.Set("uri", uri, emoji.ID)
+			}
+			if imageStaticURL := emoji.ImageStaticURL; imageStaticURL != "" {
+				lm.Set("imagestaticurl", imageStaticURL, emoji.ID)
 			}
 		},
 
 		DeleteLookups: func(lm *cache.LookupMap[string, string], emoji *gtsmodel.Emoji) {
+			lm.Delete("shortcodedomain", shortcodeDomainKey(emoji.Shortcode, emoji.Domain))
 			if uri := emoji.URI; uri != "" {
 				lm.Delete("uri", uri)
-				lm.Delete("shortcodedomain", shortcodeDomainKey(emoji.Shortcode, emoji.Domain))
+			}
+			if imageStaticURL := emoji.ImageStaticURL; imageStaticURL != "" {
+				lm.Delete("imagestaticurl", imageStaticURL)
 			}
 		},
 	})
@@ -72,6 +79,10 @@ func (c *EmojiCache) GetByShortcodeDomain(shortcode string, domain string) (*gts
 	return c.cache.GetBy("shortcodedomain", shortcodeDomainKey(shortcode, domain))
 }
 
+func (c *EmojiCache) GetByImageStaticURL(imageStaticURL string) (*gtsmodel.Emoji, bool) {
+	return c.cache.GetBy("imagestaticurl", imageStaticURL)
+}
+
 // Put places an emoji in the cache, ensuring that the object place is a copy for thread-safety
 func (c *EmojiCache) Put(emoji *gtsmodel.Emoji) {
 	if emoji == nil || emoji.ID == "" {
@@ -80,6 +91,10 @@ func (c *EmojiCache) Put(emoji *gtsmodel.Emoji) {
 	c.cache.Set(emoji.ID, copyEmoji(emoji))
 }
 
+func (c *EmojiCache) Invalidate(emojiID string) {
+	c.cache.Invalidate(emojiID)
+}
+
 // copyEmoji performs a surface-level copy of emoji, only keeping attached IDs intact, not the objects.
 // due to all the data being copied being 99% primitive types or strings (which are immutable and passed by ptr)
 // this should be a relatively cheap process