Automata/packages/nodes-base/nodes/Mattermost/v1/actions/user/getAll/execute.ts

import {
	IExecuteFunctions,
} from 'n8n-core';

import {
	IDataObject,
	INodeExecutionData,
	NodeOperationError,
} from 'n8n-workflow';

import {
	apiRequest,
	apiRequestAllItems,
} from '../../../transport';

import {
	snakeCase,
} from 'change-case';

export async function getAll(this: IExecuteFunctions, index: number): Promise<INodeExecutionData[]> {
	const returnAll = this.getNodeParameter('returnAll', index) as boolean;
	const additionalFields = this.getNodeParameter('additionalFields', index) as IDataObject;

	const qs = {} as IDataObject;
	const requestMethod = 'GET';
	const endpoint = '/users';
	const body = {} as IDataObject;

	if (additionalFields.inTeam) {
		qs.in_team = additionalFields.inTeam;
	}

	if (additionalFields.notInTeam) {
		qs.not_in_team = additionalFields.notInTeam;
	}

	if (additionalFields.inChannel) {
		qs.in_channel = additionalFields.inChannel;
	}

	if (additionalFields.notInChannel) {
		qs.not_in_channel = additionalFields.notInChannel;
	}

	if (additionalFields.sort) {
		qs.sort = snakeCase(additionalFields.sort as string);
	}

	const validRules = {
		inTeam: ['last_activity_at', 'created_at', 'username'],
		inChannel: ['status', 'username'],
	};

	if (additionalFields.sort) {
		if (additionalFields.inTeam !== undefined || additionalFields.inChannel !== undefined) {

			if (additionalFields.inTeam !== undefined
				&& !validRules.inTeam.includes(snakeCase(additionalFields.sort as string))) {
				throw new NodeOperationError(this.getNode(), `When In Team is set the only valid values for sorting are ${validRules.inTeam.join(',')}`);
			}
			if (additionalFields.inChannel !== undefined
				&& !validRules.inChannel.includes(snakeCase(additionalFields.sort as string))) {
				throw new NodeOperationError(this.getNode(), `When In Channel is set the only valid values for sorting are ${validRules.inChannel.join(',')}`);
			}
			if (additionalFields.inChannel === ''
				&& additionalFields.sort !== 'username') {
				throw new NodeOperationError(this.getNode(), 'When sort is different than username In Channel must be set');
			}

			if (additionalFields.inTeam === ''
				&& additionalFields.sort !== 'username') {
				throw new NodeOperationError(this.getNode(), 'When sort is different than username In Team must be set');
			}

		} else {
			throw new NodeOperationError(this.getNode(), `When sort is defined either 'in team' or 'in channel' must be defined`);
		}
	}

	if (additionalFields.sort === 'username') {
		qs.sort = '';
	}

	if (returnAll === false) {
		qs.per_page = this.getNodeParameter('limit', index) as number;
	}


	let responseData;

	if (returnAll) {
		responseData = await apiRequestAllItems.call(this, requestMethod, endpoint, body, qs);
	} else {
		responseData = await apiRequest.call(this, requestMethod, endpoint, body, qs);
	}

	return this.helpers.returnJsonArray(responseData);
}