Move plugin loading to its own file. Define plugin API more explicitly.

src/data/Thread.js

@@ -67,7 +67,7 @@ class Thread {
         let savedAttachment;
 
         await Promise.all([
-          attachments.attachmentToFile(attachment).then(file => {
+          attachments.attachmentToDiscordFileObject(attachment).then(file => {
             files.push(file);
           }),
           attachments.saveAttachment(attachment).then(result => {
@@ -146,7 +146,7 @@ class Thread {
       logContent += formatted; // Logs always contain the link
 
       if (config.relaySmallAttachmentsAsAttachments && attachment.size <= 1024 * 1024 * 2) {
-        const file = await attachments.attachmentToFile(attachment);
+        const file = await attachments.attachmentToDiscordFileObject(attachment);
         attachmentFiles.push(file);
       } else {
         threadContent += formatted;

src/data/attachments.js

@@ -128,7 +128,7 @@ async function saveDiscordAttachment(attachment) {
     throw new Error('Attachment storage channel must be a text channel!');
   }
 
-  const file = await attachmentToFile(attachment);
+  const file = await attachmentToDiscordFileObject(attachment);
   const savedAttachment = await createDiscordAttachmentMessage(attachmentChannel, file);
   if (! savedAttachment) return getErrorResult();
 
@@ -156,7 +156,7 @@ async function createDiscordAttachmentMessage(channel, file, tries = 0) {
  * @param {Object} attachment
  * @returns {Promise<{file, name: string}>}
  */
-async function attachmentToFile(attachment) {
+async function attachmentToDiscordFileObject(attachment) {
   const downloadResult = await downloadAttachment(attachment);
   const data = await readFile(downloadResult.path);
   downloadResult.cleanup();
@@ -195,7 +195,8 @@ attachmentStorageTypes.discord = saveDiscordAttachment;
 
 module.exports = {
   getLocalAttachmentPath,
-  attachmentToFile,
+  attachmentToDiscordFileObject,
   saveAttachment,
-  addStorageType
+  addStorageType,
+  downloadAttachment
 };

src/main.js

@@ -7,11 +7,11 @@ const knex = require('./knex');
 const {messageQueue} = require('./queue');
 const utils = require('./utils');
 const { createCommandManager } = require('./commands');
+const { getPluginAPI, loadPlugin } = require('./plugins');
 
 const blocked = require('./data/blocked');
 const threads = require('./data/threads');
 const updates = require('./data/updates');
-const attachments = require('./data/attachments');
 
 const reply = require('./modules/reply');
 const close = require('./modules/close');
@@ -265,15 +265,8 @@ function initPlugins() {
     }
   }
 
-  plugins.forEach(pluginFn => {
-    pluginFn({
-      bot,
-      knex,
-      config,
-      commands,
-      attachments,
-    });
-  });
+  const pluginApi = getPluginAPI({ bot, knex, config, commands });
+  plugins.forEach(pluginFn => loadPlugin(pluginFn, pluginApi));
 
   console.log(`Loaded ${plugins.length} plugins (${builtInPlugins.length} built-in plugins, ${plugins.length - builtInPlugins.length} external plugins)`);
 

src/plugins.js

@@ -0,0 +1,26 @@
+const attachments = require('./data/attachments');
+
+module.exports = {
+  getPluginAPI({ bot, knex, config, commands }) {
+    return {
+      bot,
+      knex,
+      config,
+      commands: {
+        manager: commands.manager,
+        addGlobalCommand: commands.addGlobalCommand,
+        addInboxServerCommand: commands.addInboxServerCommand,
+        addInboxThreadCommand: commands.addInboxThreadCommand,
+        addAlias: commands.addAlias
+      },
+      attachments: {
+        addStorageType: attachments.addStorageType,
+        downloadAttachment: attachments.downloadAttachment
+      },
+    };
+  },
+
+  loadPlugin(plugin, api) {
+    plugin(api);
+  }
+};