✨ Add Ghost-Node (#1221)

* ✨ Ghost Node

* ⚡ Minor improvements to Ghost-Node

Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

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

@@ -0,0 +1,109 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+} from 'n8n-workflow';
+
+import * as jwt from 'jsonwebtoken';
+
+export async function ghostApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, endpoint: string, body: any = {}, query: IDataObject = {}, uri?: string): Promise<any> { // tslint:disable-line:no-any
+
+	const source = this.getNodeParameter('source', 0) as string;
+
+	let credentials;
+	let version;
+	let token;
+
+	if (source === 'contentApi') {
+		//https://ghost.org/faq/api-versioning/
+		version = 'v3';
+		credentials = this.getCredentials('ghostContentApi') as IDataObject;
+		query.key = credentials.apiKey as string;
+	} else {
+		version = 'v2';
+		credentials = this.getCredentials('ghostAdminApi') as IDataObject;
+		// Create the token (including decoding secret)
+		const [id, secret] = (credentials.apiKey as string).split(':');
+
+		token = jwt.sign({}, Buffer.from(secret, 'hex'), {
+			keyid: id,
+			algorithm: 'HS256',
+			expiresIn: '5m',
+			audience: `/${version}/admin/`,
+		});
+	}
+
+	const options: OptionsWithUri = {
+		method,
+		qs: query,
+		uri: uri || `${credentials.url}/ghost/api/${version}${endpoint}`,
+		body,
+		json: true,
+	};
+
+	if (token) {
+		options.headers = {
+			Authorization: `Ghost ${token}`,
+		};
+	}
+
+	try {
+		return await this.helpers.request!(options);
+
+	} catch (error) {
+		let errorMessages;
+
+		if (error.response && error.response.body && error.response.body.errors) {
+
+			if (Array.isArray(error.response.body.errors)) {
+
+				const errors = error.response.body.errors;
+
+				errorMessages = errors.map((e: IDataObject) => e.message);
+			}
+
+			throw new Error(`Ghost error response [${error.statusCode}]: ${errorMessages?.join('|')}`);
+		}
+
+		throw error;
+	}
+}
+
+export async function ghostApiRequestAllItems(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+
+	const returnData: IDataObject[] = [];
+
+	let responseData;
+
+	query.limit = 20;
+
+	let uri: string | undefined;
+
+	do {
+		responseData = await ghostApiRequest.call(this, method, endpoint, body, query, uri);
+		uri = responseData.meta.pagination.next;
+		returnData.push.apply(returnData, responseData[propertyName]);
+	} while (
+		responseData.meta.pagination.next !== null
+	);
+	return returnData;
+}
+
+export function validateJSON(json: string | undefined): any { // tslint:disable-line:no-any
+	let result;
+	try {
+		result = JSON.parse(json!);
+	} catch (exception) {
+		result = undefined;
+	}
+	return result;
+}