feat(Hubspot): Add support for Private App Token Authentication

* add Hubspot Private App Token Authentication

* ⚡ Add credential verification

* ⚡ Rename app token

Co-authored-by: Rene Wagner <wagner@villacircle.com>
Co-authored-by: Jan Oberhauser <janober@users.noreply.github.com>

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

@@ -10,7 +10,10 @@ import {
 } from 'n8n-core';
 
 import {
+	ICredentialDataDecryptedObject,
+	ICredentialTestFunctions,
 	IDataObject,
+	JsonObject,
 	NodeApiError,
 } from 'n8n-workflow';
 
@@ -59,7 +62,7 @@ export async function hubspotApiRequest(this: IHookFunctions | IExecuteFunctions
 			return await this.helpers.requestOAuth2!.call(this, 'hubspotOAuth2Api', options, { tokenType: 'Bearer', includeCredentialsOnRefreshOnBody: true });
 		}
 	} catch (error) {
-		throw new NodeApiError(this.getNode(), error);
+		throw new NodeApiError(this.getNode(), error as JsonObject);
 	}
 }
 
@@ -1969,3 +1972,33 @@ export const getAssociations = (associations: {
 		...(associations.ticketIds && { ticketIds: associations.ticketIds.toString().split(',') }),
 	};
 };
+
+export async function validateCredentials(
+	this: ICredentialTestFunctions,
+	decryptedCredentials: ICredentialDataDecryptedObject,
+): Promise<any> { // tslint:disable-line:no-any
+	const credentials = decryptedCredentials;
+
+	const {
+		apiKey,
+		appToken,
+	} = credentials as {
+		appToken: string,
+		apiKey: string,
+	};
+
+	const options: OptionsWithUri = {
+		method: 'GET',
+		headers: {},
+		uri: `https://api.hubapi.com/deals/v1/deal/paged`,
+		json: true,
+	};
+
+	if (apiKey) {
+		options.qs = { hapikey: apiKey };
+	} else {
+		options.headers = { Authorization: `Bearer ${appToken}` };
+	}
+
+	return await this.helpers.request(options);
+}