n8n/packages/nodes-base/nodes/Asana/AsanaTrigger.node.ts

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import {
IHookFunctions,
IWebhookFunctions,
} from 'n8n-core';
import {
IDataObject,
ILoadOptionsFunctions,
INodePropertyOptions,
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INodeType,
INodeTypeDescription,
IWebhookResponseData,
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} from 'n8n-workflow';
import {
asanaApiRequest,
getWorkspaces,
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} from './GenericFunctions';
// import {
// createHmac,
// } from 'crypto';
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export class AsanaTrigger implements INodeType {
description: INodeTypeDescription = {
displayName: 'Asana Trigger',
name: 'asanaTrigger',
icon: 'file:asana.png',
group: ['trigger'],
version: 1,
description: 'Starts the workflow when Asana events occure.',
defaults: {
name: 'Asana-Trigger',
color: '#FC636B',
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},
inputs: [],
outputs: ['main'],
credentials: [
{
name: 'asanaApi',
required: true,
displayOptions: {
show: {
authentication: [
'accessToken',
],
},
},
},
{
name: 'asanaOAuth2Api',
required: true,
displayOptions: {
show: {
authentication: [
'oAuth2',
],
},
},
},
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],
webhooks: [
{
name: 'default',
httpMethod: 'POST',
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responseMode: 'onReceived',
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path: 'webhook',
},
],
properties: [
{
displayName: 'Authentication',
name: 'authentication',
type: 'options',
options: [
{
name: 'Access Token',
value: 'accessToken',
},
{
name: 'OAuth2',
value: 'oAuth2',
},
],
default: 'accessToken',
description: 'The resource to operate on.',
},
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{
displayName: 'Resource',
name: 'resource',
type: 'string',
default: '',
required: true,
description: 'The resource ID to subscribe to. The resource can be a task or project.',
},
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{
displayName: 'Workspace',
name: 'workspace',
type: 'options',
typeOptions: {
loadOptionsMethod: 'getWorkspaces',
},
options: [],
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default: '',
required: false,
description: 'The workspace ID the resource is registered under. This is only required if you want to allow overriding existing webhooks.',
},
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],
};
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methods = {
loadOptions: {
// Get all the available workspaces to display them to user so that he can
// select them easily
async getWorkspaces(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
const workspaces = await getWorkspaces.call(this);
workspaces.unshift({
name: '',
value: '',
});
return workspaces;
},
},
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};
// @ts-ignore (because of request)
webhookMethods = {
default: {
async checkExists(this: IHookFunctions): Promise<boolean> {
const webhookData = this.getWorkflowStaticData('node');
const webhookUrl = this.getNodeWebhookUrl('default') as string;
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const resource = this.getNodeParameter('resource') as string;
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const workspace = this.getNodeParameter('workspace') as string;
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const endpoint = '/webhooks';
const { data } = await asanaApiRequest.call(this, 'GET', endpoint, {}, { workspace });
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for (const webhook of data) {
if (webhook.resource.gid === resource && webhook.target === webhookUrl) {
webhookData.webhookId = webhook.gid;
return true;
}
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}
// If it did not error then the webhook exists
return false;
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},
async create(this: IHookFunctions): Promise<boolean> {
const webhookData = this.getWorkflowStaticData('node');
const webhookUrl = this.getNodeWebhookUrl('default') as string;
if (webhookUrl.includes('%20')) {
throw new Error('The name of the Asana Trigger Node is not allowed to contain any spaces!');
}
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const resource = this.getNodeParameter('resource') as string;
const endpoint = `/webhooks`;
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const body = {
resource,
target: webhookUrl,
};
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let responseData;
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responseData = await asanaApiRequest.call(this, 'POST', endpoint, body);
if (responseData.data === undefined || responseData.data.gid === undefined) {
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// Required data is missing so was not successful
return false;
}
webhookData.webhookId = responseData.data.gid as string;
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return true;
},
async delete(this: IHookFunctions): Promise<boolean> {
const webhookData = this.getWorkflowStaticData('node');
if (webhookData.webhookId !== undefined) {
const endpoint = `/webhooks/${webhookData.webhookId}`;
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const body = {};
try {
await asanaApiRequest.call(this, 'DELETE', endpoint, body);
} catch (e) {
return false;
}
// Remove from the static workflow data so that it is clear
// that no webhooks are registred anymore
delete webhookData.webhookId;
delete webhookData.webhookEvents;
delete webhookData.hookSecret;
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}
return true;
},
},
};
async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
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const bodyData = this.getBodyData() as IDataObject;
const headerData = this.getHeaderData() as IDataObject;
const req = this.getRequestObject();
const webhookData = this.getWorkflowStaticData('node');
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if (headerData['x-hook-secret'] !== undefined) {
// Is a create webhook confirmation request
webhookData.hookSecret = headerData['x-hook-secret'];
const res = this.getResponseObject();
res.set('X-Hook-Secret', webhookData.hookSecret as string);
res.status(200).end();
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return {
noWebhookResponse: true,
};
}
// Is regular webhook call
// Check if it contains any events
if (bodyData.events === undefined || !Array.isArray(bodyData.events) ||
bodyData.events.length === 0) {
// Does not contain any event data so nothing to process so no reason to
// start the workflow
return {};
}
// TODO: Had to be deactivated as it is currently not possible to get the secret
// in production mode as the static data overwrites each other because the
// two exist at the same time (create webhook [with webhookId] and receive
// webhook [with secret])
// // Check if the request is valid
// // (if the signature matches to data and hookSecret)
// const computedSignature = createHmac('sha256', webhookData.hookSecret as string).update(JSON.stringify(req.body)).digest('hex');
// if (headerData['x-hook-signature'] !== computedSignature) {
// // Signature is not valid so ignore call
// return {};
// }
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return {
workflowData: [
this.helpers.returnJsonArray(req.body.events)
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],
};
}
}