n8n/packages/nodes-base/nodes/N8n/GenericFunctions.ts

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import {
DeclarativeRestApiSettings,
IDataObject,
IExecuteFunctions,
IExecutePaginationFunctions,
IExecuteSingleFunctions,
IHookFunctions,
IHttpRequestOptions,
ILoadOptionsFunctions,
INodeExecutionData,
JsonObject,
NodeApiError,
NodeOperationError,
PreSendAction,
} from 'n8n-workflow';
import { OptionsWithUri } from 'request';
/**
* A custom API request function to be used with the resourceLocator lookup queries.
*/
export async function apiRequest(
this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions,
method: string,
endpoint: string,
body: object,
query?: IDataObject,
): Promise<any> {
query = query || {};
type N8nApiCredentials = {
apiKey: string;
baseUrl: string;
};
const credentials = (await this.getCredentials('n8nApi')) as N8nApiCredentials;
const baseUrl = credentials.baseUrl;
const options: OptionsWithUri = {
method,
body,
qs: query,
uri: `${baseUrl.replace(new RegExp('/$'), '')}/${endpoint}`,
json: true,
};
try {
return this.helpers.requestWithAuthentication.call(this, 'n8nApi', options);
} catch (error) {
if (error instanceof NodeApiError) {
throw error;
}
throw new NodeApiError(this.getNode(), error as JsonObject);
}
}
export async function apiRequestAllItems(
this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions,
method: string,
endpoint: string,
body: object,
query?: IDataObject,
): Promise<any> {
query = query || {};
const returnData: IDataObject[] = [];
let nextCursor: string | undefined = undefined;
let responseData;
do {
query.cursor = nextCursor;
query.limit = 100;
responseData = await apiRequest.call(this, method, endpoint, body, query);
returnData.push.apply(returnData, responseData.data);
nextCursor = responseData.nextCursor as string | undefined;
} while (nextCursor);
return returnData;
}
/**
* Get a cursor-based paginator to use with n8n 'getAll' type endpoints.
*
* It will look up a 'nextCursor' in the response and if the node has
* 'returnAll' set to true, will consecutively include it as the 'cursor' query
* parameter for the next request, effectively getting everything in slices.
*
* Prequisites:
* - routing.send.paginate must be set to true, for all requests to go through here
* - node is expected to have a boolean parameter 'returnAll'
* - no postReceive action setting the rootProperty, to get the items mapped
*
* @returns A ready-to-use cursor-based paginator function.
*/
export const getCursorPaginator = () => {
return async function cursorPagination(
this: IExecutePaginationFunctions,
requestOptions: DeclarativeRestApiSettings.ResultOptions,
): Promise<INodeExecutionData[]> {
if (!requestOptions.options.qs) {
requestOptions.options.qs = {};
}
let executions: INodeExecutionData[] = [];
let responseData: INodeExecutionData[];
let nextCursor: string | undefined = undefined;
const returnAll = this.getNodeParameter('returnAll', true) as boolean;
const extractItems = (page: INodeExecutionData) => {
const items = page.json.data as IDataObject[];
if (items) {
// Extract the items themselves
executions = executions.concat(items.map((item) => ({ json: item })));
}
};
do {
requestOptions.options.qs.cursor = nextCursor;
responseData = await this.makeRoutingRequest(requestOptions);
// Check for another page of items
const lastItem = responseData[responseData.length - 1].json;
nextCursor = lastItem.nextCursor as string | undefined;
responseData.forEach(extractItems);
// If we don't return all, just return the first page
} while (returnAll && nextCursor);
return executions;
};
};
/**
* A helper function to parse a node parameter as JSON and set it in the request body.
* Throws a NodeOperationError is the content is not valid JSON or it cannot be set.
*
* Currently, parameters with type 'json' are not validated automatically.
* Also mapping the value for 'body.data' declaratively has it treated as a string,
* but some operations (e.g. POST /credentials) don't work unless it is set as an object.
* To get the JSON-body operations to work consistently, we need to parse and set the body
* manually.
*
* @param parameterName The name of the node parameter to parse
* @param setAsBodyProperty An optional property name to set the parsed data into
* @returns The requestOptions with its body replaced with the contents of the parameter
*/
export const parseAndSetBodyJson = (
parameterName: string,
setAsBodyProperty?: string,
): PreSendAction => {
return async function (
this: IExecuteSingleFunctions,
requestOptions: IHttpRequestOptions,
): Promise<IHttpRequestOptions> {
try {
const rawData = this.getNodeParameter(parameterName, '{}') as string;
const parsedObject = JSON.parse(rawData);
// Set the parsed object to either as the request body directly, or as its sub-property
if (setAsBodyProperty === undefined) {
requestOptions.body = parsedObject;
} else {
requestOptions.body = Object.assign({}, requestOptions.body, {
[setAsBodyProperty]: parsedObject,
});
}
} catch (err) {
throw new NodeOperationError(
this.getNode(),
`The '${parameterName}' property must be valid JSON, but cannot be parsed: ${err}`,
);
}
return requestOptions;
};
};
/**
* A helper function to prepare the workflow object data for creation. It only sets
* known workflow properties, for pre-emptively avoiding a HTTP 400 Bad Request
* response until we have a better client-side schema validation mechanism.
*
* NOTE! This expects the requestOptions.body to already be set as an object,
* so take care to first call parseAndSetBodyJson().
*/
export const prepareWorkflowCreateBody: PreSendAction = async function (
this: IExecuteSingleFunctions,
requestOptions: IHttpRequestOptions,
): Promise<IHttpRequestOptions> {
const body = requestOptions.body as IDataObject;
const newBody: IDataObject = {};
newBody.name = body.name || 'My workflow';
newBody.nodes = body.nodes || [];
newBody.settings = body.settings || {};
newBody.connections = body.connections || {};
newBody.staticData = body.staticData || null;
requestOptions.body = newBody;
return requestOptions;
};
/**
* A helper function to prepare the workflow object data for update.
*
* NOTE! This expects the requestOptions.body to already be set as an object,
* so take care to first call parseAndSetBodyJson().
*/
export const prepareWorkflowUpdateBody: PreSendAction = async function (
this: IExecuteSingleFunctions,
requestOptions: IHttpRequestOptions,
): Promise<IHttpRequestOptions> {
const body = requestOptions.body as IDataObject;
const newBody: IDataObject = {};
if (body.name) {
newBody.name = body.name;
}
if (body.nodes) {
newBody.nodes = body.nodes;
}
if (body.settings) {
newBody.settings = body.settings;
}
if (body.connections) {
newBody.connections = body.connections;
}
if (body.staticData) {
newBody.staticData = body.staticData;
}
requestOptions.body = newBody;
return requestOptions;
};