fedimbed: support posts with >4 images (up to 18)

src/modules/fedimbed.js

@@ -637,12 +637,107 @@ async function processUrl(msg, url, spoiler = false) {
   const embeds = [];
 
   if (images.length > 0) {
-    for (const attachment of images) {
+    if (images.length == 4) {
-      const embed = Object.assign({}, baseEmbed);
+      for (const attachment of images) {
-      embed.image = {
+        const embed = Object.assign({}, baseEmbed);
-        url: attachment.url,
+        embed.image = {
-      };
+          url: attachment.url,
-      embeds.push(embed);
+        };
+        embeds.push(embed);
+      }
+    } else if (images.length > 4 && images.length <= 10) {
+      for (const attachment of images) {
+        const size = await fetch(attachment.url, {
+          method: "HEAD",
+          headers: {
+            "User-Agent": FRIENDLY_USERAGENT,
+          },
+        }).then((res) => Number(res.headers.get("Content-Length")));
+
+        if (size <= getUploadLimit(msg.channel.guild)) {
+          const file = await fetch(attachment.url, {
+            headers: {
+              "User-Agent": FRIENDLY_USERAGENT,
+            },
+          })
+            .then((res) => res.arrayBuffer())
+            .then((buf) => Buffer.from(buf));
+
+          files.push({
+            filename:
+              (cw != "" || spoiler ? "SPOILER_" : "") +
+              (attachment.type.indexOf("/") > -1
+                ? attachment.type.replace("/", ".")
+                : attachment.type +
+                  "." +
+                  (url.match(/\.([a-z0-9]{3,4})$/)?.[0] ?? "png")),
+            file,
+            description: attachment.desc,
+          });
+        }
+      }
+      embeds.push(baseEmbed);
+    } else {
+      const ten = images.slice(0, 10);
+
+      for (const attachment of ten) {
+        const size = await fetch(attachment.url, {
+          method: "HEAD",
+          headers: {
+            "User-Agent": FRIENDLY_USERAGENT,
+          },
+        }).then((res) => Number(res.headers.get("Content-Length")));
+
+        if (size <= getUploadLimit(msg.channel.guild)) {
+          const file = await fetch(attachment.url, {
+            headers: {
+              "User-Agent": FRIENDLY_USERAGENT,
+            },
+          })
+            .then((res) => res.arrayBuffer())
+            .then((buf) => Buffer.from(buf));
+
+          files.push({
+            filename:
+              (cw != "" || spoiler ? "SPOILER_" : "") +
+              (attachment.type.indexOf("/") > -1
+                ? attachment.type.replace("/", ".")
+                : attachment.type +
+                  "." +
+                  (url.match(/\.([a-z0-9]{3,4})$/)?.[0] ?? "png")),
+            file,
+            description: attachment.desc,
+          });
+        }
+
+        if (images.length <= 14) {
+          const fourteen = images.slice(10, Math.min(images.length, 14));
+
+          for (const attachment of fourteen) {
+            const embed = Object.assign({}, baseEmbed);
+            embed.image = {
+              url: attachment.url,
+            };
+            embeds.push(embed);
+          }
+        }
+
+        if (images.length <= 18) {
+          const eighteen = images.slice(14, Math.min(images.length, 18));
+          const _embed = {
+            url: baseEmbed.url + "?_",
+            title: "Additional Images",
+          };
+
+          for (const attachment of eighteen) {
+            const embed = Object.assign({}, _embed);
+            embed.image = {
+              url: attachment.url,
+            };
+            embeds.push(embed);
+          }
+        }
+      }
     }
   } else {
     embeds.push(baseEmbed);