mirror of
https://github.com/snapotter-hq/SnapOtter.git
synced 2026-08-03 07:46:42 +02:00
286 lines
9.4 KiB
TypeScript
286 lines
9.4 KiB
TypeScript
import { randomUUID } from "node:crypto";
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import { writeFile } from "node:fs/promises";
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import { join } from "node:path";
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import archiver from "archiver";
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import type { FastifyInstance } from "fastify";
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import * as mupdf from "mupdf";
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import sharp from "sharp";
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import { z } from "zod";
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import { createWorkspace } from "../../lib/workspace.js";
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// ── Settings schema ──────────────────────────────────────────────
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const settingsSchema = z.object({
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format: z.enum(["png", "jpg", "webp", "avif", "tiff"]).default("png"),
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dpi: z.union([z.literal(72), z.literal(150), z.literal(300), z.literal(600)]).default(150),
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pages: z.string().default("all"),
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});
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// ── Page range parser (exported for unit tests) ──────────────────
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export function parsePageRange(input: string, totalPages: number): number[] {
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const trimmed = input.trim();
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if (trimmed === "" || trimmed.toLowerCase() === "all") {
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return Array.from({ length: totalPages }, (_, i) => i + 1);
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}
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const pages = new Set<number>();
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const segments = trimmed.split(",");
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for (const segment of segments) {
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const seg = segment.trim();
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if (seg === "") {
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throw new Error("Invalid page range format");
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}
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if (seg.includes("-")) {
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const [startStr, endStr] = seg.split("-").map((s) => s.trim());
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const start = Number(startStr);
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const end = Number(endStr);
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if (!Number.isInteger(start) || !Number.isInteger(end)) {
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throw new Error("Invalid page range format");
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}
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if (start < 1 || end < 1) {
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throw new Error("Page numbers must be positive");
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}
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if (start > end) {
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throw new Error("Invalid page range: start exceeds end");
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}
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if (end > totalPages) {
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throw new Error(`Page(s) ${end} out of range (document has ${totalPages} pages)`);
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}
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for (let i = start; i <= end; i++) {
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pages.add(i);
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}
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} else {
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const page = Number(seg);
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if (!Number.isInteger(page)) {
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throw new Error("Invalid page range format");
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}
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if (page < 1) {
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throw new Error("Page numbers must be positive");
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}
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if (page > totalPages) {
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throw new Error(`Page(s) ${page} out of range (document has ${totalPages} pages)`);
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}
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pages.add(page);
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}
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}
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return [...pages].sort((a, b) => a - b);
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}
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// ── Sharp format mapping ─────────────────────────────────────────
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const FORMAT_EXT: Record<string, string> = {
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png: ".png",
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jpg: ".jpg",
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webp: ".webp",
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avif: ".avif",
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tiff: ".tiff",
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};
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function convertWithSharp(pngBuffer: Uint8Array, format: string): Promise<Buffer> {
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const s = sharp(Buffer.from(pngBuffer));
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switch (format) {
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case "jpg":
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return s.jpeg().toBuffer();
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case "webp":
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return s.webp().toBuffer();
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case "avif":
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return s.avif().toBuffer();
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case "tiff":
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return s.tiff().toBuffer();
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default:
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return s.png().toBuffer();
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}
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}
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// ── Render a single page ─────────────────────────────────────────
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function renderPage(doc: mupdf.Document, pageIndex: number, dpi: number): Uint8Array {
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const page = doc.loadPage(pageIndex);
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try {
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const scale = dpi / 72;
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const pixmap = page.toPixmap(
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mupdf.Matrix.scale(scale, scale),
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mupdf.ColorSpace.DeviceRGB,
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false,
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true,
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);
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try {
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return pixmap.asPNG();
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} finally {
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pixmap.destroy();
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}
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} finally {
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page.destroy();
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}
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}
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// ── Route registration ───────────────────────────────────────────
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export function registerPdfToImage(app: FastifyInstance) {
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// ── Info endpoint ────────────────────────────────────────────
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app.post("/api/v1/tools/pdf-to-image/info", async (request, reply) => {
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let fileBuffer: Buffer | null = null;
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try {
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const parts = request.parts();
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for await (const part of parts) {
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if (part.type === "file") {
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const chunks: Buffer[] = [];
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for await (const chunk of part.file) {
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chunks.push(chunk);
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}
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fileBuffer = Buffer.concat(chunks);
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}
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}
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} catch (err) {
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return reply.status(400).send({
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error: "Failed to parse multipart request",
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details: err instanceof Error ? err.message : String(err),
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});
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}
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if (!fileBuffer || fileBuffer.length === 0) {
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return reply.status(400).send({ error: "No PDF file provided" });
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}
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let doc: mupdf.Document | null = null;
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try {
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doc = mupdf.Document.openDocument(fileBuffer, "application/pdf");
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if (doc.needsPassword()) {
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return reply.status(400).send({ error: "Password-protected PDFs are not supported" });
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}
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const pageCount = doc.countPages();
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return reply.send({ pageCount });
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} catch (err) {
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if (
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err instanceof Error &&
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(err.message.includes("password") || err.message.includes("Password"))
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) {
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return reply.status(400).send({ error: "Password-protected PDFs are not supported" });
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}
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return reply.status(400).send({ error: "Invalid or corrupt PDF file" });
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} finally {
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doc?.destroy();
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}
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});
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// ── Main processing endpoint ─────────────────────────────────
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app.post("/api/v1/tools/pdf-to-image", async (request, reply) => {
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let fileBuffer: Buffer | null = null;
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let settingsRaw: string | null = null;
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try {
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const parts = request.parts();
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for await (const part of parts) {
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if (part.type === "file") {
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const chunks: Buffer[] = [];
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for await (const chunk of part.file) {
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chunks.push(chunk);
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}
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fileBuffer = Buffer.concat(chunks);
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} else if (part.fieldname === "settings") {
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settingsRaw = part.value as string;
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}
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}
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} catch (err) {
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return reply.status(400).send({
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error: "Failed to parse multipart request",
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details: err instanceof Error ? err.message : String(err),
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});
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}
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if (!fileBuffer || fileBuffer.length === 0) {
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return reply.status(400).send({ error: "No PDF file provided" });
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}
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let settings: z.infer<typeof settingsSchema>;
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try {
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const parsed = settingsRaw ? JSON.parse(settingsRaw) : {};
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const result = settingsSchema.safeParse(parsed);
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if (!result.success) {
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return reply.status(400).send({ error: "Invalid settings", details: result.error.issues });
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}
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settings = result.data;
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} catch {
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return reply.status(400).send({ error: "Settings must be valid JSON" });
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}
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let doc: mupdf.Document | null = null;
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try {
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doc = mupdf.Document.openDocument(fileBuffer, "application/pdf");
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if (doc.needsPassword()) {
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return reply.status(400).send({ error: "Password-protected PDFs are not supported" });
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}
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const totalPages = doc.countPages();
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let selectedPages: number[];
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try {
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selectedPages = parsePageRange(settings.pages, totalPages);
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} catch (err) {
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return reply
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.status(400)
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.send({ error: err instanceof Error ? err.message : "Invalid page range" });
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}
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const ext = FORMAT_EXT[settings.format] ?? ".png";
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// ── Single page: workspace + JSON response ─────────────
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if (selectedPages.length === 1) {
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const pageNum = selectedPages[0];
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const pngBytes = renderPage(doc, pageNum - 1, settings.dpi);
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doc.destroy();
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doc = null;
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const imageBuffer = await convertWithSharp(pngBytes, settings.format);
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const jobId = randomUUID();
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const workspacePath = await createWorkspace(jobId);
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const filename = `page-${pageNum}${ext}`;
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await writeFile(join(workspacePath, "output", filename), imageBuffer);
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return reply.send({
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jobId,
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downloadUrl: `/api/v1/download/${jobId}/${encodeURIComponent(filename)}`,
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pageCount: totalPages,
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selectedPages,
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format: settings.format,
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});
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}
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// ── Multiple pages: stream ZIP ─────────────────────────
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const jobId = randomUUID();
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reply.hijack();
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reply.raw.writeHead(200, {
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"Content-Type": "application/zip",
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"Content-Disposition": `attachment; filename="pdf-pages-${jobId.slice(0, 8)}.zip"`,
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"Transfer-Encoding": "chunked",
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});
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const archive = archiver("zip", { zlib: { level: 5 } });
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archive.pipe(reply.raw);
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for (const pageNum of selectedPages) {
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const pngBytes = renderPage(doc, pageNum - 1, settings.dpi);
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const imageBuffer = await convertWithSharp(pngBytes, settings.format);
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archive.append(imageBuffer, { name: `page-${pageNum}${ext}` });
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}
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doc.destroy();
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doc = null;
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await archive.finalize();
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} catch (err) {
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doc?.destroy();
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if (!reply.raw.headersSent) {
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return reply.status(422).send({
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error: "PDF conversion failed",
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details: err instanceof Error ? err.message : "Unknown error",
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});
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}
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}
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});
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}
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