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

import {
	OptionsWithUrl,
} from 'request';

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

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

export async function twitterApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions | IHookFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
	let options: OptionsWithUrl = {
		method,
		body,
		qs,
		url: uri || `https://api.twitter.com/1.1${resource}`,
		json: true,
	};
	try {
		if (Object.keys(option).length !== 0) {
			options = Object.assign({}, options, option);
		}
		if (Object.keys(body).length === 0) {
			delete options.body;
		}
		if (Object.keys(qs).length === 0) {
			delete options.qs;
		}
		//@ts-ignore
		return await this.helpers.requestOAuth1.call(this, 'twitterOAuth1Api', options);
	} catch (error) {
		if (error.response && error.response.body && error.response.body.errors) {
			// Try to return the error prettier
			const errorMessages = error.response.body.errors.map((error: IDataObject) => {
				return error.message;
			});
			throw new Error(`Twitter error response [${error.statusCode}]: ${errorMessages.join(' | ')}`);
		}

		throw error;
	}
}

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

	const returnData: IDataObject[] = [];

	let responseData;

	query.count = 100;

	do {
		responseData = await twitterApiRequest.call(this, method, endpoint, body, query);
		query.since_id = responseData.search_metadata.max_id;
		returnData.push.apply(returnData, responseData[propertyName]);
	} while (
		responseData.search_metadata &&
		responseData.search_metadata.next_results
	);

	return returnData;
}

export function chunks (buffer: Buffer, chunkSize: number) {
	const result = [];
	const len = buffer.length;
	let i = 0;

	while (i < len) {
		result.push(buffer.slice(i, i += chunkSize));
	}

	return result;
}

export async function uploadAttachments(this: IExecuteFunctions, binaryProperties: string[], items: INodeExecutionData[], i: number) {
	
	const uploadUri = 'https://upload.twitter.com/1.1/media/upload.json';
	
	const media: IDataObject[] = [];

	for (const binaryPropertyName of binaryProperties) {

		const binaryData = items[i].binary as IBinaryKeyData;

		if (binaryData === undefined) {
			throw new Error('No binary data set. So file can not be written!');
		}

		if (!binaryData[binaryPropertyName]) {
			continue;
		}

		let attachmentBody = {};
		let response: IDataObject = {};

		const isAnimatedWebp = (Buffer.from(binaryData[binaryPropertyName].data, 'base64').toString().indexOf('ANMF') !== -1);

		const isImage = binaryData[binaryPropertyName].mimeType.includes('image');

		if (isImage && isAnimatedWebp) {
			throw new Error('Animated .webp images are not supported use .gif instead');
		}

		if (isImage) {

			const attachmentBody = {
				media_data: binaryData[binaryPropertyName].data,
			};

			response = await twitterApiRequest.call(this, 'POST', '', {}, {}, uploadUri, { form: attachmentBody });

			media.push(response);

		} else {

			// https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-upload-init

			attachmentBody = {
				command: 'INIT',
				total_bytes: Buffer.from(binaryData[binaryPropertyName].data, BINARY_ENCODING).byteLength,
				media_type: binaryData[binaryPropertyName].mimeType,
			};

			response = await twitterApiRequest.call(this, 'POST', '', {}, {},  uploadUri, { form: attachmentBody });

			const mediaId = response.media_id_string;

			// break the data on 5mb chunks (max size that can be uploaded at once)

			const binaryParts = chunks(Buffer.from(binaryData[binaryPropertyName].data, BINARY_ENCODING), 5242880);

			let index = 0;

			for (const binaryPart of binaryParts) {

				//https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-upload-append

				attachmentBody = {
					name: binaryData[binaryPropertyName].fileName,
					command: 'APPEND',
					media_id: mediaId,
					media_data: Buffer.from(binaryPart).toString('base64'),
					segment_index: index,
				};

				response = await twitterApiRequest.call(this, 'POST', '', {}, {}, uploadUri, { form: attachmentBody });

				index++;
			}

			//https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-upload-finalize

			attachmentBody = {
				command: 'FINALIZE',
				media_id: mediaId,
			};

			response = await twitterApiRequest.call(this, 'POST', '', {}, {}, uploadUri, { form: attachmentBody });

			// data has not been uploaded yet, so wait for it to be ready
			if (response.processing_info) {
				const { check_after_secs } = (response.processing_info as IDataObject);
				await new Promise((resolve, reject) => {
					setTimeout(() => {
						resolve();
					}, (check_after_secs as number) * 1000);
				});
			}
			
			media.push(response);
		}

		return media;
	}
}