From 1c8d475362b808dbc3004e74de64538615764d74 Mon Sep 17 00:00:00 2001
From: Cynthia Foxwell <gamers@riseup.net>
Date: Mon, 11 Nov 2024 11:09:18 -0700
Subject: [PATCH] fedimbed.bluesky: https://tenor.com/view/12766761978490409957

---
 src/modules/fedimbed.js | 101 ++++++++++++++++++++++++----------------
 1 file changed, 60 insertions(+), 41 deletions(-)

diff --git a/src/modules/fedimbed.js b/src/modules/fedimbed.js
index 3184e69..2197d50 100644
--- a/src/modules/fedimbed.js
+++ b/src/modules/fedimbed.js
@@ -120,6 +120,61 @@ async function signedFetch(url, options) {
   return await fetch(url, options);
 }
 
+// https://tenor.com/view/12766761978490409957
+// https://github.com/bluesky-social/atproto/blob/main/packages/api/src/rich-text/unicode.ts
+const encoder = new TextEncoder();
+const decoder = new TextDecoder();
+function utf16Slice(utf8, start, end) {
+  return decoder.decode(utf8.slice(start, end));
+}
+
+function processBlueskyFacets(str, facets) {
+  const utf16 = str;
+  const utf8 = encoder.encode(utf16);
+
+  const splitString = [];
+
+  let start = 0;
+  for (const facet of facets) {
+    splitString.push({text: utf16Slice(utf8, start, facet.index.byteStart)});
+
+    splitString.push({
+      text: utf16Slice(utf8, facet.index.byteStart, facet.index.byteEnd),
+      features: facet.features,
+    });
+    start = facet.index.byteEnd;
+  }
+  splitString.push({text: utf16Slice(utf8, start)});
+
+  for (const part of splitString) {
+    if (part.features)
+      for (const feature of part.features) {
+        switch (feature.$type) {
+          case "app.bsky.richtext.facet#link": {
+            if (part.text == feature.uri.replace(/^https?:\/\//, "")) {
+              part.text = feature.uri;
+            } else {
+              part.text = `[${part.text}](${feature.uri})`;
+            }
+            break;
+          }
+          case "app.bsky.richtext.facet#mention": {
+            part.text = `[${part.text}](https://bsky.app/profile/${feature.did})`;
+            break;
+          }
+          case "app.bsky.richtext.facet#tag": {
+            part.text = `[${part.text}](https://bsky.app/hashtag/${feature.tag})`;
+            break;
+          }
+          default:
+            break;
+        }
+      }
+  }
+
+  return splitString.map((part) => part.text).join("");
+}
+
 async function blueskyQuoteEmbed(quote) {
   const embeds = [];
   const videos = [];
@@ -139,6 +194,10 @@ async function blueskyQuoteEmbed(quote) {
     timestamp: quote.value.createdAt,
   };
 
+  if (quote.value.facets?.length > 0) {
+    mainEmbed.description = processBlueskyFacets(mainEmbed.description, quote.value.facets);
+  }
+
   if (quote.embeds?.[0]) {
     const embed = quote.embeds[0];
     switch (embed.$type) {
@@ -239,47 +298,7 @@ async function bluesky(msg, url, spoiler = false) {
   };
 
   if (post.record.facets?.length > 0) {
-    const splitString = [];
-    const chars = [...mainEmbed.description]; // emojis...
-    let start = 0;
-    for (const facet of post.record.facets) {
-      splitString.push({text: chars.slice(start, facet.index.byteStart).join("")});
-
-      splitString.push({
-        text: chars.slice(facet.index.byteStart, facet.index.byteEnd).join(""),
-        features: facet.features,
-      });
-      start = facet.index.byteEnd;
-    }
-    splitString.push({text: chars.slice(start).join("")});
-
-    for (const part of splitString) {
-      if (part.features)
-        for (const feature of part.features) {
-          switch (feature.$type) {
-            case "app.bsky.richtext.facet#link": {
-              if (part.text == feature.uri.replace(/^https?:\/\//, "")) {
-                part.text = feature.uri;
-              } else {
-                part.text = `[${part.text}](${feature.uri})`;
-              }
-              break;
-            }
-            case "app.bsky.richtext.facet#mention": {
-              part.text = `[${part.text}](https://bsky.app/profile/${feature.did})`;
-              break;
-            }
-            case "app.bsky.richtext.facet#tag": {
-              part.text = `[${part.text}](https://bsky.app/hashtag/${feature.tag})`;
-              break;
-            }
-            default:
-              break;
-          }
-        }
-    }
-
-    mainEmbed.description = splitString.map((part) => part.text).join("");
+    mainEmbed.description = processBlueskyFacets(mainEmbed.description, post.record.facets);
   }
 
   if (data.thread.parent) {