Migrate ChannelArchiver to new Plugin structure, isOwner -> pluginUtils

backend/src/plugins/ChannelArchiver/rehostAttachment.ts

@@ -0,0 +1,29 @@
+import { Attachment, TextChannel } from "eris";
+import { downloadFile } from "src/utils";
+import fs from "fs";
+const fsp = fs.promises;
+
+const MAX_ATTACHMENT_REHOST_SIZE = 1024 * 1024 * 8;
+
+export async function rehostAttachment(attachment: Attachment, targetChannel: TextChannel): Promise<string> {
+  if (attachment.size > MAX_ATTACHMENT_REHOST_SIZE) {
+    return "Attachment too big to rehost";
+  }
+
+  let downloaded;
+  try {
+    downloaded = await downloadFile(attachment.url, 3);
+  } catch (e) {
+    return "Failed to download attachment after 3 tries";
+  }
+
+  try {
+    const rehostMessage = await targetChannel.createMessage(`Rehost of attachment ${attachment.id}`, {
+      name: attachment.filename,
+      file: await fsp.readFile(downloaded.path),
+    });
+    return rehostMessage.attachments[0].url;
+  } catch (e) {
+    return "Failed to rehost attachment";
+  }
+}