feat: Add support for Mammoth library for docx file uploads

src/loader/docx.ts

@@ -0,0 +1,33 @@
+import { BaseDocumentLoader } from "langchain/document_loaders/base"
+import { Document } from "@langchain/core/documents"
+import * as mammoth from "mammoth"
+
+export interface WebLoaderParams {
+    fileName: string
+    buffer: ArrayBuffer
+}
+
+export class PageAssistDocxLoader
+    extends BaseDocumentLoader
+    implements WebLoaderParams {
+    fileName: string
+    buffer: ArrayBuffer
+
+    constructor({ fileName, buffer }: WebLoaderParams) {
+        super()
+        this.fileName = fileName
+        this.buffer = buffer
+    }
+
+    public async load(): Promise<Document[]> {
+        const data = await mammoth.extractRawText({
+            arrayBuffer: this.buffer
+        })
+        const text = data.value
+        const meta = { source: this.fileName }
+        if (text) {
+            return [new Document({ pageContent: text, metadata: meta })]
+        }
+        return []
+    }
+}