96 lines
2.1 KiB
TypeScript
96 lines
2.1 KiB
TypeScript
interface ChromeDownloadsLike {
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download(
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options: {
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filename: string;
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saveAs?: boolean;
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url: string;
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},
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callback?: () => void
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): Promise<unknown> | void;
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}
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interface ChromeRuntimeLike {
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onMessage?: {
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addListener(
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listener: (
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message: unknown,
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sender: unknown,
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sendResponse: (response: unknown) => void
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) => boolean | void
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): void;
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};
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}
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interface ChromeLike {
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downloads?: ChromeDownloadsLike;
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runtime?: ChromeRuntimeLike;
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}
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type DownloadMarketCsvMessage = {
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csv: string;
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filename: string;
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type: "download-market-csv";
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};
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export function registerBackgroundMessageHandler(
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chromeLike: ChromeLike = (
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globalThis as typeof globalThis & {
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chrome?: ChromeLike;
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}
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).chrome ?? {}
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): void {
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chromeLike.runtime?.onMessage?.addListener((message, _sender, sendResponse) => {
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if (!isDownloadMarketCsvMessage(message)) {
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return;
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}
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void triggerCsvDownload(chromeLike, message)
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.then(() => {
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sendResponse({ ok: true });
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})
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.catch((error) => {
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sendResponse({
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error: error instanceof Error ? error.message : String(error),
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ok: false
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});
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});
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return true;
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});
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}
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async function triggerCsvDownload(
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chromeLike: ChromeLike,
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message: DownloadMarketCsvMessage
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): Promise<void> {
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if (!chromeLike.downloads?.download) {
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throw new Error("chrome.downloads.download is unavailable");
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}
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const csvUrl = `data:text/csv;charset=utf-8,${encodeURIComponent(`\uFEFF${message.csv}`)}`;
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await Promise.resolve(
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chromeLike.downloads.download({
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filename: message.filename,
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saveAs: false,
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url: csvUrl
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})
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);
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}
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function isDownloadMarketCsvMessage(
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message: unknown
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): message is DownloadMarketCsvMessage {
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if (!message || typeof message !== "object") {
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return false;
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}
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const candidate = message as Partial<DownloadMarketCsvMessage>;
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return (
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candidate.type === "download-market-csv" &&
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typeof candidate.csv === "string" &&
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typeof candidate.filename === "string"
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);
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}
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registerBackgroundMessageHandler();
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