1.0.0

src/schedule/internal/xls-downloader/basic-xls-downloader.ts

@@ -0,0 +1,92 @@
+import {
+	XlsDownloaderBase,
+	XlsDownloaderCacheMode,
+	XlsDownloaderResult,
+} from "./xls-downloader.base";
+import axios from "axios";
+import { JSDOM } from "jsdom";
+
+export class BasicXlsDownloader extends XlsDownloaderBase {
+	cache: XlsDownloaderResult | null = null;
+
+	private async getDOM(): Promise<JSDOM> {
+		const response = await axios.get(this.url);
+
+		if (response.status !== 200) {
+			throw new Error(`Не удалось получить данные с основной страницы!
+Статус код: ${response.status}
+${response.statusText}`);
+		}
+
+		return new JSDOM(response.data, {
+			url: this.url,
+			contentType: "text/html",
+		});
+	}
+
+	private parseData(dom: JSDOM): {
+		downloadLink: string;
+		updateDate: string;
+	} {
+		const schedule_block = dom.window.document.getElementById("cont-i");
+		if (schedule_block === null)
+			throw new Error("Не удалось найти блок расписаний!");
+
+		const schedules = schedule_block.getElementsByTagName("div");
+		if (schedules === null || schedules.length === 0)
+			throw new Error("Не удалось найти строку с расписанием!");
+
+		const poltavskaya = schedules[0];
+		const link = poltavskaya.getElementsByTagName("a")[0]!;
+
+		const spans = poltavskaya.getElementsByTagName("span");
+		const update_date = spans[3].textContent!.trimStart();
+
+		return {
+			downloadLink: link.href,
+			updateDate: update_date,
+		};
+	}
+
+	public async getCachedXLS(): Promise<XlsDownloaderResult | null> {
+		if (this.cache === null) return null;
+
+		this.cache.new = this.cacheMode === XlsDownloaderCacheMode.HARD;
+
+		return this.cache;
+	}
+
+	public async downloadXLS(): Promise<XlsDownloaderResult> {
+		if (
+			this.cacheMode === XlsDownloaderCacheMode.HARD &&
+			this.cache !== null
+		)
+			return this.getCachedXLS();
+
+		const dom = await this.getDOM();
+		const parse_data = this.parseData(dom);
+
+		const response = await axios.get(parse_data.downloadLink, {
+			responseType: "arraybuffer",
+		});
+		if (response.status !== 200) {
+			throw new Error(`Не удалось получить excel файл!
+Статус код: ${response.status}
+${response.statusText}`);
+		}
+
+		const result: XlsDownloaderResult = {
+			fileData: response.data.buffer,
+			updateDate: parse_data.updateDate,
+			etag: response.headers["etag"],
+			new:
+				this.cacheMode === XlsDownloaderCacheMode.NONE
+					? true
+					: this.cache?.etag !== response.headers["etag"],
+		};
+
+		if (this.cacheMode !== XlsDownloaderCacheMode.NONE) this.cache = result;
+
+		return result;
+	}
+}