✨ Add Wekan-Node (#1043)

* Add Wekan node

* :zap Improvements to #1026

* ⚡ Small improvements

Co-authored-by: Dokime <jnau5@yahoo.com>

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

@@ -0,0 +1,78 @@
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	IHookFunctions,
+	ILoadOptionsFunctions,
+	IWebhookFunctions,
+} from 'n8n-core';
+
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	ICredentialDataDecryptedObject,
+	IDataObject,
+} from 'n8n-workflow';
+
+export async function getAuthorization(
+	this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions | IWebhookFunctions,
+	credentials?: ICredentialDataDecryptedObject,
+): Promise<IDataObject> {
+	if (credentials === undefined) {
+		throw new Error('No credentials got returned!');
+	}
+
+	const { password, username } = credentials;
+	const options: OptionsWithUri = {
+		method: 'POST',
+		form: {
+			username,
+			password,
+		},
+		uri: `${credentials.url}/users/login`,
+		json: true,
+	};
+
+	try {
+		const response = await this.helpers.request!(options);
+
+		return { token: response.token, userId: response.id };
+	} catch (error) {
+		throw new Error('Wekan Error: ' + error.error.reason);
+	}
+}
+
+export async function apiRequest(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, method: string, endpoint: string, body: object, query?: IDataObject): Promise<any> { // tslint:disable-line:no-any
+	const credentials = this.getCredentials('wekanApi');
+
+	if (credentials === undefined) {
+		throw new Error('No credentials got returned!');
+	}
+
+	query = query || {};
+
+	const { token } = await getAuthorization.call(this, credentials);
+
+	const options: OptionsWithUri = {
+		headers: {
+			'Accept':'application/json',
+			'Authorization': `Bearer ${token}`,
+		},
+		method,
+		body,
+		qs: query,
+		uri: `${credentials.url}/api/${endpoint}`,
+		json: true,
+	};
+
+	try {
+		return await this.helpers.request!(options);
+	} catch (error) {
+		if (error.statusCode === 401) {
+			throw new Error('The Wekan credentials are not valid!');
+		}
+
+		throw error;
+	}
+}