n8n/packages/nodes-base/nodes/Microsoft/Outlook/GenericFunctions.ts

import {
	OptionsWithUri,
} from 'request';

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

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

export async function microsoftApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, headers: IDataObject = {}, option: IDataObject = { json: true }): Promise<any> { // tslint:disable-line:no-any
	const credentials = this.getCredentials('microsoftOutlookOAuth2Api');

	let apiUrl = `https://graph.microsoft.com/v1.0/me${resource}`;
	// If accessing shared mailbox
	if (credentials!.useShared && credentials!.userPrincipalName) {
		apiUrl = `https://graph.microsoft.com/v1.0/users/${credentials!.userPrincipalName}${resource}`;
	}

	const options: OptionsWithUri = {
		headers: {
			'Content-Type': 'application/json',
		},
		method,
		body,
		qs,
		uri: uri || apiUrl,
	};
	try {
		Object.assign(options, option);

		if (Object.keys(headers).length !== 0) {
			options.headers = Object.assign({}, options.headers, headers);
		}

		if (Object.keys(body).length === 0) {
			delete options.body;
		}

		//@ts-ignore
		return await this.helpers.requestOAuth2.call(this, 'microsoftOutlookOAuth2Api', options);
	} catch (error) {
		if (error.response && error.response.body && error.response.body.error && error.response.body.error.message) {
			// Try to return the error prettier
			throw new Error(`Microsoft error response [${error.statusCode}]: ${error.response.body.error.message}`);
		}
		throw error;
	}
}

export async function microsoftApiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}, headers: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any

	const returnData: IDataObject[] = [];

	let responseData;
	let uri: string | undefined;
	query['$top'] = 100;

	do {
		responseData = await microsoftApiRequest.call(this, method, endpoint, body, query, uri, headers);
		uri = responseData['@odata.nextLink'];
		returnData.push.apply(returnData, responseData[propertyName]);
	} while (
		responseData['@odata.nextLink'] !== undefined
	);

	return returnData;
}

export async function microsoftApiRequestAllItemsSkip(this: IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}, headers: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any

	const returnData: IDataObject[] = [];

	let responseData;
	query['$top'] = 100;
	query['$skip'] = 0;

	do {
		responseData = await microsoftApiRequest.call(this, method, endpoint, body, query, undefined, headers);
		query['$skip'] += query['$top'];
		returnData.push.apply(returnData, responseData[propertyName]);
	} while (
		responseData['value'].length !== 0
	);

	return returnData;
}

export function makeRecipient(email: string) {
	return {
		emailAddress: {
			address: email,
		},
	};
}

export function createMessage(fields: IDataObject) {
	const message: IDataObject = {};

	// Create body object
	if (fields.bodyContent || fields.bodyContentType) {
		const bodyObject = {
			content: fields.bodyContent,
			contentType: fields.bodyContentType,
		};

		message['body'] = bodyObject;
		delete fields['bodyContent'];
		delete fields['bodyContentType'];
	}

	// Handle custom headers
	if ('internetMessageHeaders' in fields && 'headers' in (fields.internetMessageHeaders as IDataObject)) {
		fields.internetMessageHeaders = (fields.internetMessageHeaders as IDataObject).headers;
	}

	// Handle recipient fields
	['bccRecipients', 'ccRecipients', 'replyTo', 'sender', 'toRecipients'].forEach(key => {
		if (Array.isArray(fields[key])) {
			fields[key] = (fields[key] as string[]).map(email => makeRecipient(email));
		} else if (fields[key] !== undefined) {
			fields[key] = (fields[key] as string).split(',').map((recipient: string) => makeRecipient(recipient));
		}
	});

	['from', 'sender'].forEach(key => {
		if (fields[key] !== undefined) {
			fields[key] = makeRecipient(fields[key] as string);
		}
	});


	Object.assign(message, fields);

	return message;
}

export async function downloadAttachments(this: IExecuteFunctions, messages: IDataObject[] | IDataObject, prefix: string) {
	const elements: INodeExecutionData[] = [];
	if (!Array.isArray(messages)) {
		messages = [messages];
	}
	for (const message of messages) {
		const element: INodeExecutionData = {
			json: message,
			binary: {},
		};
		if (message.hasAttachments === true) {
			const attachments = await microsoftApiRequestAllItems.call(
				this,
				'value',
				'GET',
				`/messages/${message.id}/attachments`,
				{},
			);
			for (const [index, attachment] of attachments.entries()) {
				const response = await microsoftApiRequest.call(
					this,
					'GET',
					`/messages/${message.id}/attachments/${attachment.id}/$value`,
					undefined,
					{},
					undefined,
					{},
					{ encoding: null, resolveWithFullResponse: true },
				);

				const data = Buffer.from(response.body as string, 'utf8');
				element.binary![`${prefix}${index}`] = await this.helpers.prepareBinaryData(data as unknown as Buffer, attachment.name, attachment.contentType);
			}
		}
		if (Object.keys(element.binary!).length === 0) {
			delete element.binary;
		}
		elements.push(element);
	}
	return elements;
}