File size: 15,639 Bytes
3da3d2a 5147353 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b 3da3d2a a297b28 3da3d2a 872f742 3da3d2a 872f742 3da3d2a dc2059f 3da3d2a bbb9a5b 84c65fc 7dc3ae1 bbb9a5b 7dc3ae1 68badc3 bbb9a5b 84c65fc 7dc3ae1 bbb9a5b 84c65fc 7dc3ae1 bbb9a5b 7dc3ae1 bbb9a5b 7dc3ae1 bbb9a5b 0b5445b 3da3d2a 0b5445b 3da3d2a bbb9a5b 3da3d2a 5147353 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 | (function (root) {
"use strict";
const LIMITS = Object.freeze({
documentBytes: 512 * 1024 * 1024,
archiveCompressedBytes: 512 * 1024 * 1024,
archiveExpandedBytes: 1536 * 1024 * 1024,
archiveEntries: 20000,
archiveRatio: 200,
manifestBytes: 8 * 1024 * 1024,
pdfPages: 100000,
chapters: 10000,
chapterBytes: 8 * 1024 * 1024,
chapterTotalBytes: 512 * 1024 * 1024
});
function error(code) {
const value = new Error(code);
value.code = code;
return value;
}
function assertResponseSize(response, limit) {
const length = Number(response?.headers?.get?.("content-length"));
if (Number.isFinite(length) && length > limit) throw error("READER_RESOURCE_LIMIT");
return response;
}
function createByteBudget(limit = LIMITS.chapterTotalBytes) {
if (!Number.isSafeInteger(limit) || limit < 0) throw new RangeError("Invalid byte budget");
let used = 0;
function reserve(bytes) {
if (!Number.isSafeInteger(bytes) || bytes < 0) throw new RangeError("Invalid byte count");
if (bytes > limit - used) throw error("READER_RESOURCE_LIMIT");
used += bytes;
}
function release(bytes) {
if (!Number.isSafeInteger(bytes) || bytes < 0 || bytes > used)
throw new RangeError("Invalid byte release");
used -= bytes;
}
return Object.freeze({
reserve,
release,
get used() {
return used;
},
get remaining() {
return limit - used;
}
});
}
// Failed reads release their reservations; successful reads retain them until
// the caller releases discarded content. Share one budget across a book.
async function readBytes(response, limit = LIMITS.documentBytes, budget) {
let reader,
reserved = 0;
try {
assertResponseSize(response, limit);
if (!response.body?.getReader) {
const bytes = new Uint8Array(await response.arrayBuffer());
if (bytes.byteLength > limit) throw error("READER_RESOURCE_LIMIT");
budget?.reserve(bytes.byteLength);
return bytes;
}
reader = response.body.getReader();
const chunks = [];
let length = 0;
while (true) {
const { value, done } = await reader.read();
if (done) break;
if (!value?.byteLength) continue;
length += value.byteLength;
if (length > limit) throw error("READER_RESOURCE_LIMIT");
budget?.reserve(value.byteLength);
reserved += value.byteLength;
chunks.push(value);
}
const output = new Uint8Array(length);
let offset = 0;
for (const chunk of chunks) {
output.set(chunk, offset);
offset += chunk.byteLength;
}
return output;
} catch (reason) {
if (budget && reserved) budget.release(reserved);
try {
if (reader) await reader.cancel(reason);
else await response.body?.cancel?.(reason);
} catch (_) {}
throw reason;
} finally {
reader?.releaseLock?.();
}
}
async function readText(response, limit, encoding = "utf-8", budget) {
const decoder = new TextDecoder(encoding);
const bytes = await readBytes(response, limit, budget);
try {
return decoder.decode(bytes);
} catch (reason) {
budget?.release(bytes.byteLength);
throw reason;
}
}
function inspectZip(bytes, limits = LIMITS) {
bytes = bytes instanceof Uint8Array ? bytes : new Uint8Array(bytes);
if (bytes.byteLength > limits.archiveCompressedBytes) throw error("READER_ARCHIVE_LIMIT");
const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
let end = -1;
// EOCD must end at EOF, including its optional comment. File contents are
// never searched for central-directory entries.
for (
let offset = bytes.byteLength - 22;
offset >= Math.max(0, bytes.byteLength - 22 - 65535);
offset--
) {
if (
view.getUint32(offset, true) === 0x06054b50 &&
offset + 22 + view.getUint16(offset + 20, true) === bytes.byteLength
) {
end = offset;
break;
}
}
if (end < 0) throw error("READER_ARCHIVE_INVALID");
const disk = view.getUint16(end + 4, true),
directoryDisk = view.getUint16(end + 6, true);
const diskEntries = view.getUint16(end + 8, true),
entries = view.getUint16(end + 10, true);
const directorySize = view.getUint32(end + 12, true),
directoryOffset = view.getUint32(end + 16, true);
if (
disk === 0xffff ||
directoryDisk === 0xffff ||
diskEntries === 0xffff ||
entries === 0xffff ||
directorySize === 0xffffffff ||
directoryOffset === 0xffffffff ||
(end >= 20 && view.getUint32(end - 20, true) === 0x07064b50)
) {
throw error("READER_ARCHIVE_ZIP64_UNSUPPORTED");
}
if (disk || directoryDisk || diskEntries !== entries)
throw error("READER_ARCHIVE_MULTIDISK_UNSUPPORTED");
if (!entries || directoryOffset + directorySize !== end) throw error("READER_ARCHIVE_INVALID");
if (entries > limits.archiveEntries) throw error("READER_ARCHIVE_LIMIT");
let offset = directoryOffset,
compressed = 0,
expanded = 0;
for (let index = 0; index < entries; index++) {
if (offset + 46 > end || view.getUint32(offset, true) !== 0x02014b50)
throw error("READER_ARCHIVE_INVALID");
const packed = view.getUint32(offset + 20, true),
unpacked = view.getUint32(offset + 24, true);
const nameLength = view.getUint16(offset + 28, true),
extraLength = view.getUint16(offset + 30, true),
commentLength = view.getUint16(offset + 32, true);
const startDisk = view.getUint16(offset + 34, true),
localOffset = view.getUint32(offset + 42, true);
if (
packed === 0xffffffff ||
unpacked === 0xffffffff ||
localOffset === 0xffffffff ||
startDisk === 0xffff
) {
throw error("READER_ARCHIVE_ZIP64_UNSUPPORTED");
}
if (startDisk) throw error("READER_ARCHIVE_MULTIDISK_UNSUPPORTED");
const next = offset + 46 + nameLength + extraLength + commentLength;
if (!nameLength || next > end) throw error("READER_ARCHIVE_INVALID");
const extraEnd = offset + 46 + nameLength + extraLength;
for (let extra = offset + 46 + nameLength; extra < extraEnd; ) {
if (extra + 4 > extraEnd) throw error("READER_ARCHIVE_INVALID");
if (view.getUint16(extra, true) === 1) throw error("READER_ARCHIVE_ZIP64_UNSUPPORTED");
extra += 4 + view.getUint16(extra + 2, true);
if (extra > extraEnd) throw error("READER_ARCHIVE_INVALID");
}
if (localOffset + 30 > directoryOffset || view.getUint32(localOffset, true) !== 0x04034b50)
throw error("READER_ARCHIVE_INVALID");
const dataOffset =
localOffset +
30 +
view.getUint16(localOffset + 26, true) +
view.getUint16(localOffset + 28, true);
if (dataOffset + packed > directoryOffset) throw error("READER_ARCHIVE_INVALID");
compressed += packed;
expanded += unpacked;
if (
expanded > limits.archiveExpandedBytes ||
(packed === 0 ? unpacked > 0 : unpacked / packed > limits.archiveRatio)
) {
throw error("READER_ARCHIVE_LIMIT");
}
offset = next;
}
if (offset !== end) throw error("READER_ARCHIVE_INVALID");
return Object.freeze({ entries, compressed, expanded });
}
function validateChapterManifest(manifest) {
if (
manifest?.version !== 1 ||
manifest?.kind !== "epub-chapters" ||
!Array.isArray(manifest.chapters) ||
!manifest.chapters.length
)
throw error("EPUB_INVALID");
if (manifest.chapters.length > LIMITS.chapters) throw error("READER_RESOURCE_LIMIT");
let declaredBytes = 0,
expectedIndex = 1;
for (const chapter of manifest.chapters) {
if (!chapter || !Number.isInteger(chapter.index) || chapter.index !== expectedIndex)
throw error("EPUB_INVALID");
expectedIndex += 1;
if (
typeof chapter.path !== "string" ||
!chapter.path.trim() ||
/^[a-z][a-z0-9+.-]*:/i.test(chapter.path) ||
chapter.path.startsWith("/") ||
chapter.path.includes("\\") ||
chapter.path.split("/").some((part) => part === ".." || part === "." || !part)
)
throw error("EPUB_INVALID");
const rawSize = chapter.bytes ?? chapter.size;
const size = rawSize == null ? 0 : Number(rawSize);
if (!Number.isFinite(size) || size < 0 || size > LIMITS.chapterBytes)
throw error("READER_RESOURCE_LIMIT");
declaredBytes += size;
}
if (declaredBytes > LIMITS.chapterTotalBytes) throw error("READER_RESOURCE_LIMIT");
if (manifest.toc !== undefined) {
if (!Array.isArray(manifest.toc)) throw error("EPUB_INVALID");
for (const item of manifest.toc)
if (!item || typeof item.title !== "string" || !item.title.trim() ||
!Number.isInteger(item.chapter) || item.chapter < 1 || item.chapter > manifest.chapters.length ||
!Number.isInteger(item.depth) || item.depth < 0 || item.depth > 64 ||
typeof item.fragment !== "string") throw error("EPUB_INVALID");
}
return manifest;
}
function validatePdfPageManifest(manifest) {
if (!manifest || manifest.version !== 2 || manifest.kind !== "pdf-pages")
throw error("PDF_MANIFEST_INVALID");
if (!Number.isInteger(manifest.page_count) || manifest.page_count < 1 || manifest.pages !== undefined)
throw error("PDF_MANIFEST_INVALID");
const pageCount = manifest.page_count;
if (pageCount > LIMITS.pdfPages) throw error("READER_RESOURCE_LIMIT");
if (manifest.toc !== undefined) {
if (!Array.isArray(manifest.toc) || manifest.toc.length > 2000)
throw error("PDF_MANIFEST_INVALID");
for (const item of manifest.toc) {
if (
!item ||
typeof item.title !== "string" ||
!item.title.trim() ||
item.title.length > 500 ||
!Number.isInteger(item.page) ||
item.page < 1 ||
item.page > pageCount ||
!Number.isInteger(item.depth) ||
item.depth < 0 ||
item.depth > 32
)
throw error("PDF_MANIFEST_INVALID");
}
}
if (manifest.ocr !== undefined) {
if (!Array.isArray(manifest.ocr) || manifest.ocr.length !== pageCount)
throw error("PDF_MANIFEST_INVALID");
for (const [index, page] of manifest.ocr.entries()) {
const expected = String(index + 1).padStart(6, "0"),
root = typeof page?.o === "string" ? PDF_OCR_ROOT.exec(page.o)?.[1] || "" : "";
if (!page || page.p !== index + 1 || !PDF_OCR_PATH.test(page.o) ||
page.o !== `${root}/ocr/page-${expected}.json.gz` ||
pdfSourceRoot(root) !== `objects/${manifest.source_sha256.slice(0, 2)}/${manifest.source_sha256}` ||
!/^[0-9a-f]{64}$/.test(page.os || "") ||
!Number.isSafeInteger(page.ob) || page.ob < 1)
throw error("PDF_MANIFEST_INVALID");
}
}
return manifest;
}
const PDF_OCR_PATH = /^objects\/[0-9a-f]{2}\/[0-9a-f]{64}\/(?:[0-9a-f]{16}\/)?ocr\/(?:page-[0-9]{6}\.json\.gz|book-text\.json\.gz)$/;
const PDF_OCR_MANIFEST_PATH = /^objects\/[0-9a-f]{2}\/[0-9a-f]{64}\/(?:[0-9a-f]{16}\/)?ocr-manifest\.json$/;
const PDF_OCR_PAGE_PATH = /^objects\/[0-9a-f]{2}\/[0-9a-f]{64}\/(?:[0-9a-f]{16}\/)?pages\/page-[0-9]{6}\.(?:webp|jxl)$/;
const PDF_OCR_ROOT = /^(objects\/[0-9a-f]{2}\/[0-9a-f]{64}(?:\/[0-9a-f]{16})?)/;
function pdfSourceRoot(path) {
return typeof path === "string" ? path.split("/").slice(0, 3).join("/") : "";
}
function validatePdfOcrManifest(manifest) {
if (!manifest || manifest.version !== 1 || manifest.kind !== "pdf-ocr" ||
manifest.complete !== true || !/^[0-9a-f]{64}$/.test(manifest.source_sha256 || "") ||
!/layout-v\d+(?:-|$)/.test(String(manifest.profile || "")) ||
!Number.isInteger(manifest.page_count) || manifest.page_count < 1 ||
manifest.page_count > LIMITS.pdfPages || !Array.isArray(manifest.pages) ||
manifest.pages.length !== manifest.page_count)
throw error("PDF_OCR_MANIFEST_INVALID");
let root = "";
for (const [index, page] of manifest.pages.entries()) {
const expected = String(index + 1).padStart(6, "0");
const pageRoot = typeof page?.o === "string" ? PDF_OCR_ROOT.exec(page.o)?.[1] || "" : "";
if (!page || page.p !== index + 1 || !PDF_OCR_PATH.test(page.o) ||
page.o !== `${pageRoot}/ocr/page-${expected}.json.gz` ||
(page.w !== undefined && (typeof page.w !== "string" || !PDF_OCR_PAGE_PATH.test(page.w) ||
!page.w.endsWith(`/pages/page-${expected}.webp`) ||
pdfSourceRoot(page.w) !== pdfSourceRoot(pageRoot))) ||
(page.j !== undefined && (typeof page.j !== "string" || !PDF_OCR_PAGE_PATH.test(page.j) ||
!page.j.endsWith(`/pages/page-${expected}.jxl`) ||
pdfSourceRoot(page.j) !== pdfSourceRoot(pageRoot))) ||
pdfSourceRoot(pageRoot) !== `objects/${manifest.source_sha256.slice(0, 2)}/${manifest.source_sha256}` ||
(root && pdfSourceRoot(root) !== pdfSourceRoot(pageRoot)))
throw error("PDF_OCR_MANIFEST_INVALID");
root = pageRoot;
}
if (!manifest.book_text || typeof manifest.book_text.path !== "string" ||
!PDF_OCR_PATH.test(manifest.book_text.path) || !manifest.book_text.path.endsWith('/ocr/book-text.json.gz') ||
pdfSourceRoot(manifest.book_text.path) !== pdfSourceRoot(root) ||
!/^[0-9a-f]{64}$/.test(manifest.book_text.sha256 || "") ||
!Number.isSafeInteger(manifest.book_text.bytes) || manifest.book_text.bytes < 1 ||
(manifest.page_manifest !== undefined &&
(!manifest.page_manifest || typeof manifest.page_manifest.path !== "string" ||
!/^objects\/[0-9a-f]{2}\/[0-9a-f]{64}\/(?:[0-9a-f]{16}\/)?page-manifest\.json$/.test(manifest.page_manifest.path) ||
pdfSourceRoot(manifest.page_manifest.path) !== pdfSourceRoot(root))))
throw error("PDF_OCR_MANIFEST_INVALID");
return manifest;
}
function validatePdfOcrPage(payload, pageNumber) {
if (!payload || payload.version !== 1 || payload.kind !== "pdf-ocr-page" ||
payload.page !== pageNumber || !Array.isArray(payload.blocks) || payload.blocks.length > 10000 ||
!Number.isFinite(Number(payload.width)) || !Number.isFinite(Number(payload.height)))
throw error("PDF_OCR_PAGE_INVALID");
for (const block of payload.blocks) {
const box = block?.b;
if (!block || typeof block.t !== "string" || block.t.length > 4096 ||
!Array.isArray(box) || box.length !== 4 || box.some((value) => !Number.isFinite(Number(value))) ||
box[0] < 0 || box[1] < 0 || box[2] > 1 || box[3] > 1 || box[2] < box[0] || box[3] < box[1])
throw error("PDF_OCR_PAGE_INVALID");
}
return payload;
}
function isZipContainer(extension, bytes) {
return (
["epub", "fbz"].includes(String(extension || "").toLowerCase()) ||
!!(bytes && bytes[0] === 0x50 && bytes[1] === 0x4b && bytes[2] === 0x03 && bytes[3] === 0x04)
);
}
root.VoiceOfMLReaderSecurity = Object.freeze({
LIMITS,
assertResponseSize,
createByteBudget,
readBytes,
readText,
inspectZip,
validateChapterManifest,
validatePdfPageManifest,
validatePdfOcrManifest,
validatePdfOcrPage,
isZipContainer
});
})(typeof self !== "undefined" ? self : globalThis);
|