🤖 feat: Private Assistants (#2881)

* feat: add configuration for user private assistants

* filter private assistant message requests

* add test for privateAssistants

* add privateAssistants configuration to tests

* fix: destructuring error when assistants config is not added

* chore: revert chat controller changes

* chore: add payload type, add metadata types

* feat: validateAssistant

* refactor(fetchAssistants): allow for flexibility

* feat: validateAuthor

* refactor: return all assistants to ADMIN role

* feat: add assistant doc on assistant creation

* refactor(listAssistants): use `listAllAssistants` to exhaustively fetch all assistants

* chore: add suggestion to tts error

* refactor(validateAuthor): attempt database check first

* refactor: author validation when patching/deleting assistant

---------

Co-authored-by: Leon Juenemann <leon.juenemann@maibornwolff.de>

api/server/middleware/assistants/validate.js

@@ -0,0 +1,43 @@
+const { v4 } = require('uuid');
+const { handleAbortError } = require('~/server/middleware/abortMiddleware');
+
+/**
+ * Checks if the assistant is supported or excluded
+ * @param {object} req - Express Request
+ * @param {object} req.body - The request payload.
+ * @param {object} res - Express Response
+ * @param {function} next - Express next middleware function.
+ * @returns {Promise<void>}
+ */
+const validateAssistant = async (req, res, next) => {
+  const { endpoint, conversationId, assistant_id, messageId } = req.body;
+
+  /** @type {Partial<TAssistantEndpoint>} */
+  const assistantsConfig = req.app.locals?.[endpoint];
+  if (!assistantsConfig) {
+    return next();
+  }
+
+  const { supportedIds, excludedIds } = assistantsConfig;
+  const error = { message: 'Assistant not supported' };
+  if (supportedIds?.length && !supportedIds.includes(assistant_id)) {
+    return await handleAbortError(res, req, error, {
+      sender: 'System',
+      conversationId,
+      messageId: v4(),
+      parentMessageId: messageId,
+      error,
+    });
+  } else if (excludedIds?.length && excludedIds.includes(assistant_id)) {
+    return await handleAbortError(res, req, error, {
+      sender: 'System',
+      conversationId,
+      messageId: v4(),
+      parentMessageId: messageId,
+    });
+  }
+
+  return next();
+};
+
+module.exports = validateAssistant;