mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
293 lines
12 KiB
JavaScript
293 lines
12 KiB
JavaScript
importScripts("./wasm_exec.js");
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let pending = Promise.resolve();
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const operations = new Map();
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const fontRequests = new Map();
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let fontSequence = 0;
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function requestFont(id, signal, name, done) {
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if (signal.aborted) { done(null, "", true); return; }
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const request = ++fontSequence;
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const cancel = () => {
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fontRequests.delete(request);
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done(null, "", true);
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};
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signal.addEventListener("abort", cancel, { once: true });
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fontRequests.set(request, result => {
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signal.removeEventListener("abort", cancel);
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done(result.bytes, result.error || "", signal.aborted);
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});
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self.postMessage({ id, type: "font", request, name });
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}
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self.onmessage = ({ data }) => {
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if (data.type === "font") {
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fontRequests.get(data.request)?.(data);
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fontRequests.delete(data.request);
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return;
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}
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if (data.type === "cancel") {
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operations.get(data.id)?.abort();
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return;
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}
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if (data.name === "ofdgoImportImages" || data.name === "ofdgoExportImages" || data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles" || data.name === "ofdgoConvertPDF" || data.name === "ofdgoExportPage" || data.name === "ofdgoExportDocument" || data.name === "ofdgoExportAttachment" || data.name === "ofdgoSaveDocument" || data.name === "ofdgoSaveSigned" || data.name === "ofdgoImportPages") {
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operations.set(data.id, new AbortController());
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}
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pending = pending.then(() => data.name === "ofdgoConvertFile" || data.name === "ofdgoPackFiles" ? handleBatchMessage(data) : handleMessage(data));
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};
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async function availableOutput(directory, base, format) {
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for (let suffix = 0; ; suffix++) {
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const stem = suffix ? `${base} (${suffix + 1})` : base;
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const name = format.paged ? stem : `${stem}.${format.extension}`;
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try {
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await directory.getFileHandle(name);
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} catch (err) {
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if (err.name === "NotFoundError") return { stem, name };
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if (err.name !== "TypeMismatchError") throw err;
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}
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}
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}
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async function handleBatchMessage({ id, name, args }) {
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const signal = operations.get(id).signal;
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const channel = new MessageChannel();
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const finish = (done, err) => {
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channel.port1.onmessage = () => done(err?.message || "", signal.aborted);
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channel.port2.postMessage(null);
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};
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const reader = new FileReaderSync();
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const read = file => (offset, size) => new Uint8Array(reader.readAsArrayBuffer(file.slice(offset, offset + size)));
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let output = null;
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let chunks = [];
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let files = [];
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let directory = null;
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let created = null;
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let root = null;
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let current = null;
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let size = 0;
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let credentials = null;
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const write = (bytes, done) => {
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if (signal.aborted) return finish(done);
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size += bytes.byteLength;
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if (output) output.write(bytes).then(() => finish(done), err => finish(done, err));
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else { chunks.push(new Blob([bytes])); finish(done); }
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};
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try {
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signal.throwIfAborted();
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let payload;
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if (name === "ofdgoConvertFile") {
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const [file, options, fonts, destination] = args;
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credentials = options.credentials;
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const formats = JSON.parse(globalThis.ofdgoOutputFormats()).data;
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const format = formats.find(item => item.value === options.format);
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if (!format) throw new Error("不支持此格式");
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root = destination;
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const base = options.base.replace(/[<>:"/\\|?*\x00-\x1f]/g, "_").replace(/[. ]+$/g, "") || "document";
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const target = root ? await availableOutput(root, base, format) : { stem: base, name: format.paged ? base : `${base}.${format.extension}` };
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if (root && format.paged) {
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directory = await root.getDirectoryHandle(target.name, { create: true });
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created = target.name;
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self.postMessage({ id, type: "output", name: created });
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} else directory = root;
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const boundary = async (action, pageName) => {
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signal.throwIfAborted();
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if (action === "open") {
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const fileName = format.paged ? pageName : target.name;
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current = { name: format.paged ? `${target.stem}/${pageName}` : fileName, mime: format.mime };
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chunks = [];
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if (directory) {
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const handle = await directory.getFileHandle(fileName, { create: true });
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if (!format.paged) {
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created = fileName;
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self.postMessage({ id, type: "output", name: created });
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}
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current.handle = handle;
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output = await handle.createWritable();
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}
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} else {
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if (output) { await output.close(); output = null; }
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if (options.archive) current.file = current.handle ? await current.handle.getFile() : new File(chunks, pageName, { type: format.mime });
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delete current.handle;
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files.push(current);
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chunks = [];
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}
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};
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payload = await globalThis.ofdgoConvertFile(read(file), file.size, options, write,
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(phase, completed, total, done) => {
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self.postMessage({ id, type: "conversion", phase, completed, total });
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finish(done);
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},
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(action, pageName, done) => boundary(action, pageName).then(() => finish(done), err => finish(done, err)),
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done => finish(done), fonts, (name, done) => requestFont(id, signal, name, done));
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} else {
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const [entries, handle, compression] = args;
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if (handle) output = await handle.createWritable();
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payload = await globalThis.ofdgoPackFiles(entries.map(entry => ({ name: entry.name, size: entry.file.size })),
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index => read(entries[index].file), write,
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(completed, total, done) => { self.postMessage({ id, type: "conversion", phase: "pack", completed, total }); finish(done); },
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done => finish(done), compression);
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}
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signal.throwIfAborted();
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const result = typeof payload === "string" ? JSON.parse(payload) : payload;
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if (!result.ok) throw Object.assign(new Error(result.error), { code: result.code });
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if (name === "ofdgoPackFiles") {
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if (output) { await output.close(); output = null; }
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else result.data.blob = new Blob(chunks, { type: "application/zip" });
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} else {
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if (result.data.unchanged && !result.data.bytes) {
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if (output) { await output.abort(); output = null; }
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if (root && created) { await root.removeEntry(created, { recursive: true }); created = null; }
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files = [];
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}
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result.data.files = files;
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}
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result.data.size = size;
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operations.delete(id);
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self.postMessage({ id, ...result });
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} catch (err) {
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await output?.abort().catch(() => {});
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let message = signal.aborted ? "转换已取消" : err.message;
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if (root && created) {
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try { await root.removeEntry(created, { recursive: true }); }
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catch (cleanupError) { message += `；清理失败：${cleanupError.message}`; }
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}
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self.postMessage({ id, ok: false, error: message, code: err.code, canceled: signal.aborted });
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} finally {
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credentials?.password?.fill(0);
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credentials?.key?.fill(0);
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credentials?.keyPassword?.fill(0);
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channel.port1.close();
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channel.port2.close();
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operations.delete(id);
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}
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}
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async function handleMessage({ id, name, args }) {
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let output;
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let channel;
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const signal = operations.get(id)?.signal;
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const importing = name === "ofdgoImportPages" || name === "ofdgoImportImages";
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const converting = name === "ofdgoConvertPDF";
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const saving = name === "ofdgoSaveDocument" || name === "ofdgoSaveSigned";
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const key = name === "ofdgoOpen" ? args[3]?.key : name === "ofdgoSaveSigned" || name === "ofdgoLoadImport" ? args[1]?.key : null;
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const keyPassword = name === "ofdgoOpen" ? args[3]?.keyPassword : name === "ofdgoSaveSigned" || name === "ofdgoLoadImport" ? args[1]?.keyPassword : null;
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const password = converting ? args[2] : name === "ofdgoSetEncryption" ? args[0]?.password : name === "ofdgoOpen" ? args[3]?.password : name === "ofdgoLoadImport" ? args[1]?.password : null;
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try {
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signal?.throwIfAborted();
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if (name === "ofdgoImportImages") {
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const files = args[0], reader = new FileReaderSync();
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args[0] = files.map(file => file.name);
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args.push(index => {
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try { return { bytes: new Uint8Array(reader.readAsArrayBuffer(files[index])) }; }
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catch (err) { return { error: err.message }; }
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});
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}
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const chunks = [];
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let size = 0;
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if (signal) {
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channel = new MessageChannel();
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const finish = (done, err, commit = false) => {
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channel.port1.onmessage = () => {
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if (commit && !signal.aborted && !err) operations.delete(id);
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done(err?.message || "", signal.aborted);
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};
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channel.port2.postMessage(null);
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};
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if (importing || converting) {
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args.push((phase, completed, total, done) => {
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self.postMessage({ id, type: importing ? "import" : "conversion", phase, completed, total });
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finish(done, null, importing && phase === "commit");
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});
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if (converting) args.push((name, done) => requestFont(id, signal, name, done));
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} else {
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const file = args.pop();
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const compression = saving && name !== "ofdgoSaveSigned" && args.at(-1)?.mode !== undefined ? args.pop() : null;
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const indices = saving ? args.shift() : null;
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if (file) output = await file.createWritable();
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signal.throwIfAborted();
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args.push((bytes, done) => {
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if (signal.aborted) {
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finish(done);
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return;
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}
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size += bytes.length;
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if (output) {
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output.write(bytes).then(() => finish(done), (err) => finish(done, err));
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} else {
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chunks.push(new Blob([bytes]));
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finish(done);
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}
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});
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if (name === "ofdgoExportDocument") {
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args.push((completed, total, done) => {
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self.postMessage({ id, type: "export", stage: "pages", completed, total });
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finish(done);
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});
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} else if (saving) {
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args.push((phase, completed, total, done) => {
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self.postMessage({ id, type: "export", stage: "prepare", phase, completed, total });
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finish(done);
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});
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if (compression) args.push(indices, compression, done => finish(done));
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else if (indices != null) args.push(indices);
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}
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if (!saving && args.some(value => value?.mode !== undefined)) args.push(done => finish(done));
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}
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}
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const payload = await globalThis[name](...args);
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signal?.throwIfAborted();
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const result = typeof payload === "string" ? JSON.parse(payload) : payload;
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if (signal && !importing && !converting && result.ok) {
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operations.delete(id);
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result.data.size = size;
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self.postMessage({ id, type: "export", stage: "save" });
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if (output) {
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await output.close();
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} else {
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result.data.blob = new Blob(chunks, { type: result.data.mime });
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}
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} else if (output) {
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await output.abort();
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}
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output = null;
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const transfer = result.data?.bytes ? [result.data.bytes.buffer] : (result.data?.images || []).map((image) => image.bytes.buffer);
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self.postMessage({ id, ...result }, transfer);
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} catch (err) {
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await output?.abort().catch(() => {});
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const result = { id, ok: false, error: err.message };
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if (signal?.aborted) {
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result.error = importing ? "导入已取消" : converting ? "转换已取消" : "导出已取消";
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result.canceled = true;
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}
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self.postMessage(result);
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} finally {
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password?.fill(0);
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key?.fill(0);
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keyPassword?.fill(0);
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channel?.port1.close();
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channel?.port2.close();
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operations.delete(id);
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}
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}
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function exitWASM(err) {
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self.postMessage({ type: "exit", error: err?.message || "引擎运行中断" });
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self.close();
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}
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async function loadWASM() {
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const go = new Go();
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self.postMessage({ type: "progress", text: "正在下载引擎", percent: 16 });
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const response = await fetch("./ofdgo.wasm");
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self.postMessage({ type: "progress", text: "正在编译引擎", percent: 35 });
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const { instance } = await WebAssembly.instantiateStreaming(response, go.importObject);
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self.postMessage({ type: "progress", text: "正在启动引擎", percent: 58 });
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go.run(instance).then(exitWASM, exitWASM);
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if (!go.exited) {
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const backends = JSON.parse(globalThis.ofdgoRenderBackends());
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if (!backends.ok) throw new Error(backends.error);
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self.postMessage({ type: "ready", backends: backends.data });
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}
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}
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loadWASM().catch(exitWASM);
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