✨ Add Emelia nodes (#1455)

* Emelia node added

* Minor improvements on Emelia nodes

* Fix nodes and credentials listing

* Fix multi-line imports

* Apply cosmetic changes to node description

* Apply cosmetic changes to node execute method

* Fix linting details

* Apply cosmetic changes to trigger node

* Replace PNG with SVG icon

* Bring generic functions in line with codebase

* Refactor resources and add operations

* Fix typo in GraphQL call function

* Add campaign description

* Add contact list description

* ⚡ Improvements

* ⚡ Minor improvements to Emelia Nodes

Co-authored-by: Charles LECALIER <clecalie@student.42.fr>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

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

@@ -0,0 +1,104 @@
+import {
+	IExecuteFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	IHookFunctions,
+	INodePropertyOptions,
+} from 'n8n-workflow';
+
+/**
+ * Make an authenticated GraphQL request to Emelia.
+ */
+export async function emeliaGraphqlRequest(
+	this: IExecuteFunctions | ILoadOptionsFunctions,
+	body: object = {},
+) {
+	const response = await emeliaApiRequest.call(this, 'POST', '/graphql', body);
+
+	if (response.errors) {
+		throw new Error(`Emelia error message: ${response.errors[0].message}`);
+	}
+
+	return response;
+}
+
+/**
+ * Make an authenticated REST API request to Emelia, used for trigger node.
+ */
+export async function emeliaApiRequest(
+	this: IExecuteFunctions | ILoadOptionsFunctions | IHookFunctions,
+	method: string,
+	endpoint: string,
+	body: object = {},
+	qs: object = {},
+) {
+	const { apiKey } = this.getCredentials('emeliaApi') as { apiKey: string };
+
+	const options = {
+		headers: {
+			Authorization: apiKey,
+		},
+		method,
+		body,
+		qs,
+		uri: `https://graphql.emelia.io${endpoint}`,
+		json: true,
+	};
+
+	try {
+
+		return await this.helpers.request!.call(this, options);
+
+	} catch (error) {
+
+		if (error?.response?.body?.error) {
+			const { error: errorMessage } = error.response.body;
+			throw new Error(
+				`Emelia error response [${error.statusCode}]: ${errorMessage}`,
+			);
+		}
+
+		throw error;
+	}
+}
+
+/**
+ * Load resources so that the user can select them easily.
+ */
+export async function loadResource(
+	this: ILoadOptionsFunctions,
+	resource: 'campaign' | 'contactList',
+): Promise<INodePropertyOptions[]> {
+	const mapping: { [key in 'campaign' | 'contactList']: { query: string, key: string } } = {
+		campaign: {
+			query: `
+				query GetCampaigns {
+					campaigns {
+						_id
+						name
+					}
+				}`,
+			key: 'campaigns',
+		},
+		contactList: {
+			query: `
+			query GetContactLists {
+				contact_lists {
+					_id
+					name
+				}
+			}`,
+			key: 'contact_lists',
+		},
+	};
+
+	const responseData = await emeliaGraphqlRequest.call(this, { query: mapping[resource].query });
+
+	return responseData.data[mapping[resource].key].map((campaign: { name: string, _id: string }) => ({
+		name: campaign.name,
+		value: campaign._id,
+	}));
+
+}