87 lines
3.3 KiB
JavaScript
87 lines
3.3 KiB
JavaScript
'use strict';
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// Cross-browser API namespace. Firefox provides Promise-based `browser.*`;
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// Chrome MV3 exposes `browser.*` too, but some builds only populate the
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// `chrome.*` global. Alias to whichever is present.
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if (typeof browser === 'undefined' || browser == null) {
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var browser = (typeof chrome !== 'undefined' ? chrome : {});
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}
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function errMsg(err) {
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return String((err && err.message) || err);
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}
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// Build a download URL from PDF bytes. Firefox's background is a real page
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// (URL.createObjectURL available) and supports blob: URLs in downloads.
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// Chrome MV3 runs the background as a service worker where URL.createObjectURL
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// is NOT available, but its downloads API accepts base64 data: URLs.
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// Firefox rejects data: URLs in browser.downloads.download with
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// "Access denied for URL data:...", so pick per-browser.
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function buildDownloadUrl(bytes) {
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if (typeof URL !== 'undefined' && typeof URL.createObjectURL === 'function') {
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const blob = new Blob([bytes], { type: 'application/pdf' });
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return URL.createObjectURL(blob);
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}
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// Fallback: Chrome MV3 service worker. PDFs here are small (~150KB), well
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// within data-URL length limits.
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let binary = '';
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const chunk = 0x8000;
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for (let i = 0; i < bytes.length; i += chunk) {
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binary += String.fromCharCode.apply(null, bytes.subarray(i, i + chunk));
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}
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return 'data:application/pdf;base64,' + btoa(binary);
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}
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browser.runtime.onMessage.addListener((msg, sender, sendResponse) => {
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if (msg && msg.type === 'generate-pdf') {
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generatePdf(msg.data)
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.then(() => sendResponse({ ok: true }))
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.catch((err) => sendResponse({ ok: false, error: errMsg(err) }));
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return true;
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}
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});
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function formatPeriod(period) {
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if (!period) return '';
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return String(period)
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.replace(/\b1ST\b/g, '1st')
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.replace(/\b2ND\b/g, '2nd')
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.replace(/\b3RD\b/g, '3rd')
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.replace(/\b(\d+)TH\b/g, '$1th')
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.toLowerCase()
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.replace(/^./, (c) => c.toUpperCase());
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}
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async function generatePdf(data) {
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const bytes = await ISMIStools.buildStudyLoadPdf(data);
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// Firefox accepts blob: object URLs; Chrome MV3 service worker has no
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// URL.createObjectURL, so it falls back to a base64 data: URL there.
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const url = buildDownloadUrl(bytes);
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const header = data.header || {};
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const year = parseInt(data.year, 10);
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const period = formatPeriod(data.period || header.semester || '');
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const compactProgram = ISMIStools.compactProgram(header.program || '');
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const schoolYear = Number.isFinite(year) ? `${year}-${year + 1}` : '';
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const parts = [
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header.studentId || (header.fullName ? header.fullName.replace(/\s+/g, ' ') : ''),
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compactProgram,
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schoolYear ? 'S.Y. ' + schoolYear : '',
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period,
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'Study Load'
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].filter(Boolean);
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const filename = parts.join(' - ') + '.pdf';
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const fallback = 'Study Load - ' + (header.fullName || 'Student') + '.pdf';
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const safeFilename = filename || fallback;
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try {
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const id = await browser.downloads.download({ url, filename: safeFilename, saveAs: true });
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const onChanged = (delta) => {
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if (delta.id === id && delta.state && (delta.state.current === 'complete' || delta.state.current === 'interrupted')) {
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browser.downloads.onChanged.removeListener(onChanged);
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}
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};
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browser.downloads.onChanged.addListener(onChanged);
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} catch (err) {
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throw err;
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}
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}
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