✨ Add Line-Node (#1137)

* ✨ Line-Node

* ⚡ Improvements

packages/nodes-base/nodes/Line/GenericFunctions.ts

@@ -0,0 +1,50 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+} from 'n8n-workflow';
+
+export async function lineApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions | IHookFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+
+	let options: OptionsWithUri = {
+		headers: {
+			'Content-Type': 'application/json',
+		},
+		method,
+		body,
+		qs,
+		uri: uri || ``,
+		json: true,
+	};
+	options = Object.assign({}, options, option);
+
+	try {
+		if (Object.keys(body).length === 0) {
+			delete options.body;
+		}
+
+		//@ts-ignore
+		return await this.helpers.requestOAuth2.call(this, 'lineNotifyOAuth2Api', options, { tokenType: 'Bearer' });
+
+	} catch (error) {
+
+		let errorMessage;
+
+		if (error.response && error.response.body && error.response.body.message) {
+
+			errorMessage = error.response.body.message;
+
+			throw new Error(`Line error response [${error.statusCode}]: ${errorMessage}`);
+		}
+		throw error;
+	}
+}