fix(Extract from File Node): Detect file encoding (#12081)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/core/src/NodeExecuteFunctions.ts

@@ -15,6 +15,7 @@ import type {
 import { ClientOAuth2 } from '@n8n/client-oauth2';
 import type { AxiosError, AxiosHeaders, AxiosRequestConfig, AxiosResponse } from 'axios';
 import axios from 'axios';
+import chardet from 'chardet';
 import crypto, { createHmac } from 'crypto';
 import FileType from 'file-type';
 import FormData from 'form-data';
@@ -1050,6 +1051,10 @@ export async function getBinaryDataBuffer(
 	return await Container.get(BinaryDataService).getAsBuffer(binaryData);
 }
 
+export function detectBinaryEncoding(buffer: Buffer): string {
+	return chardet.detect(buffer) as string;
+}
+
 /**
  * Store an incoming IBinaryData & related buffer using the configured binary data manager.
  *

packages/core/src/node-execution-context/execute-context.ts

@@ -37,6 +37,7 @@ import {
 	getSSHTunnelFunctions,
 	getFileSystemHelperFunctions,
 	getCheckProcessedHelperFunctions,
+	detectBinaryEncoding,
 } from '@/NodeExecuteFunctions';
 
 import { BaseExecuteContext } from './base-execute-context';
@@ -96,6 +97,7 @@ export class ExecuteContext extends BaseExecuteContext implements IExecuteFuncti
 				assertBinaryData(inputData, node, itemIndex, propertyName, 0),
 			getBinaryDataBuffer: async (itemIndex, propertyName) =>
 				await getBinaryDataBuffer(inputData, itemIndex, propertyName, 0),
+			detectBinaryEncoding: (buffer: Buffer) => detectBinaryEncoding(buffer),
 		};
 
 		this.nodeHelpers = {

packages/core/src/node-execution-context/execute-single-context.ts

@@ -16,6 +16,7 @@ import { ApplicationError, createDeferredPromise, NodeConnectionType } from 'n8n
 // eslint-disable-next-line import/no-cycle
 import {
 	assertBinaryData,
+	detectBinaryEncoding,
 	getBinaryDataBuffer,
 	getBinaryHelperFunctions,
 	getRequestHelperFunctions,
@@ -69,6 +70,7 @@ export class ExecuteSingleContext extends BaseExecuteContext implements IExecute
 				assertBinaryData(inputData, node, itemIndex, propertyName, inputIndex),
 			getBinaryDataBuffer: async (propertyName, inputIndex = 0) =>
 				await getBinaryDataBuffer(inputData, itemIndex, propertyName, inputIndex),
+			detectBinaryEncoding: (buffer) => detectBinaryEncoding(buffer),
 		};
 	}
 

packages/core/src/node-execution-context/supply-data-context.ts

@@ -24,6 +24,7 @@ import {
 	assertBinaryData,
 	constructExecutionMetaData,
 	copyInputItems,
+	detectBinaryEncoding,
 	getBinaryDataBuffer,
 	getBinaryHelperFunctions,
 	getCheckProcessedHelperFunctions,
@@ -87,6 +88,7 @@ export class SupplyDataContext extends BaseExecuteContext implements ISupplyData
 				assertBinaryData(inputData, node, itemIndex, propertyName, 0),
 			getBinaryDataBuffer: async (itemIndex, propertyName) =>
 				await getBinaryDataBuffer(inputData, itemIndex, propertyName, 0),
+			detectBinaryEncoding: (buffer: Buffer) => detectBinaryEncoding(buffer),
 
 			returnJsonArray,
 			normalizeItems,