mirror of
https://github.com/snapotter-hq/SnapOtter.git
synced 2026-08-03 07:46:42 +02:00
434 lines
16 KiB
TypeScript
434 lines
16 KiB
TypeScript
import { randomUUID } from "node:crypto";
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import type { FastifyInstance } from "fastify";
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import sharp from "sharp";
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import { z } from "zod";
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import { env } from "../../config.js";
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import { autoOrient } from "../../lib/auto-orient.js";
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import { formatZodErrors } from "../../lib/errors.js";
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import { validateImageBuffer } from "../../lib/file-validation.js";
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import { sanitizeFilename } from "../../lib/filename.js";
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import { decodeToSharpCompat, needsCliDecode } from "../../lib/format-decoders.js";
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import { encodeJxl } from "../../lib/format-encoders.js";
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import { decodeHeic } from "../../lib/heic-converter.js";
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import { putObject } from "../../lib/object-storage.js";
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import { decompressSvgz, sanitizeSvg } from "../../lib/svg-sanitize.js";
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const settingsSchema = z.object({
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direction: z.enum(["horizontal", "vertical", "grid"]).default("horizontal"),
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gridColumns: z.number().int().min(2).max(100).default(2),
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resizeMode: z.enum(["fit", "original", "stretch", "crop"]).default("fit"),
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alignment: z.enum(["start", "center", "end"]).default("center"),
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gap: z.number().min(0).max(1000).default(0),
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border: z.number().min(0).max(500).default(0),
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cornerRadius: z.number().min(0).max(500).default(0),
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backgroundColor: z
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.string()
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.regex(/^#[0-9a-fA-F]{6}$/)
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.default("#FFFFFF"),
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format: z.enum(["png", "jpeg", "webp", "avif", "jxl"]).default("png"),
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quality: z.number().min(1).max(100).default(90),
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});
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function parseHexColor(hex: string): { r: number; g: number; b: number } {
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return {
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r: parseInt(hex.slice(1, 3), 16),
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g: parseInt(hex.slice(3, 5), 16),
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b: parseInt(hex.slice(5, 7), 16),
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};
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}
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interface PreparedImage {
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buffer: Buffer;
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width: number;
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height: number;
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}
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export function registerStitch(app: FastifyInstance) {
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app.post("/api/v1/tools/stitch", async (request, reply) => {
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const files: Array<{ buffer: Buffer; filename: string }> = [];
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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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const buf = Buffer.concat(chunks);
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if (buf.length > 0) {
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files.push({
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buffer: buf,
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filename: sanitizeFilename(part.filename ?? `image-${files.length}`),
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});
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}
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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 (files.length < 2) {
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return reply.status(400).send({ error: "At least 2 images are required for stitching" });
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}
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for (const file of files) {
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const validation = await validateImageBuffer(file.buffer, file.filename);
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if (!validation.valid) {
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return reply
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.status(400)
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.send({ error: `Invalid file "${file.filename}": ${validation.reason}` });
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}
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if (validation.format === "heif") {
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try {
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file.buffer = await decodeHeic(file.buffer);
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} catch (err) {
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return reply.status(422).send({
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error: `Failed to decode "${file.filename}" (HEIC). Ensure libheif-examples is installed.`,
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details: err instanceof Error ? err.message : String(err),
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});
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}
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}
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if (needsCliDecode(validation.format)) {
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const fileExt = file.filename.split(".").pop()?.toLowerCase();
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try {
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file.buffer = await decodeToSharpCompat(file.buffer, validation.format, fileExt);
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} catch {
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try {
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await sharp(file.buffer).metadata();
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} catch (err) {
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return reply.status(422).send({
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error: `Failed to decode "${file.filename}" (${validation.format.toUpperCase()})`,
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details: err instanceof Error ? err.message : String(err),
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});
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}
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}
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}
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if (validation.format === "svg") {
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try {
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file.buffer = decompressSvgz(file.buffer);
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file.buffer = sanitizeSvg(file.buffer);
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} catch (err) {
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return reply.status(400).send({
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error: `Invalid SVG "${file.filename}": ${err instanceof Error ? err.message : "Unknown error"}`,
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});
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}
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}
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file.buffer = await autoOrient(file.buffer);
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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
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.status(400)
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.send({ error: "Invalid settings", details: formatZodErrors(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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try {
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const imageMetas = await Promise.all(
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files.map(async (file) => {
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const meta = await sharp(file.buffer).metadata();
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return {
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buffer: file.buffer,
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width: meta.width ?? 0,
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height: meta.height ?? 0,
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};
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}),
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);
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const isHorizontal = settings.direction === "horizontal";
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const isGrid = settings.direction === "grid";
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let prepared: PreparedImage[];
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if (isGrid) {
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prepared = await prepareForGrid(imageMetas, settings);
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} else if (isHorizontal) {
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prepared = await prepareForHorizontal(imageMetas, settings.resizeMode);
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} else {
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prepared = await prepareForVertical(imageMetas, settings.resizeMode);
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}
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let canvasWidth: number;
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let canvasHeight: number;
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const composites: sharp.OverlayOptions[] = [];
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if (isGrid) {
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const cols = Math.min(settings.gridColumns, prepared.length);
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const rows = Math.ceil(prepared.length / cols);
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const cellWidth = Math.max(...prepared.map((img) => img.width));
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const cellHeight = Math.max(...prepared.map((img) => img.height));
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canvasWidth = cols * cellWidth + (cols - 1) * settings.gap + 2 * settings.border;
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canvasHeight = rows * cellHeight + (rows - 1) * settings.gap + 2 * settings.border;
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for (let i = 0; i < prepared.length; i++) {
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const col = i % cols;
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const row = Math.floor(i / cols);
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const img = prepared[i];
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const cellLeft = settings.border + col * (cellWidth + settings.gap);
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const cellTop = settings.border + row * (cellHeight + settings.gap);
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const left = cellLeft + alignOffset(cellWidth, img.width, settings.alignment);
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const top = cellTop + alignOffset(cellHeight, img.height, settings.alignment);
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composites.push({ input: img.buffer, left, top });
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}
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} else if (isHorizontal) {
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const totalImgWidth = prepared.reduce((sum, img) => sum + img.width, 0);
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const maxHeight = Math.max(...prepared.map((img) => img.height));
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canvasWidth = totalImgWidth + (prepared.length - 1) * settings.gap + 2 * settings.border;
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canvasHeight = maxHeight + 2 * settings.border;
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let offset = settings.border;
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for (const img of prepared) {
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const top = settings.border + alignOffset(maxHeight, img.height, settings.alignment);
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composites.push({ input: img.buffer, left: offset, top });
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offset += img.width + settings.gap;
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}
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} else {
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const maxWidth = Math.max(...prepared.map((img) => img.width));
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const totalImgHeight = prepared.reduce((sum, img) => sum + img.height, 0);
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canvasWidth = maxWidth + 2 * settings.border;
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canvasHeight = totalImgHeight + (prepared.length - 1) * settings.gap + 2 * settings.border;
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let offset = settings.border;
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for (const img of prepared) {
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const left = settings.border + alignOffset(maxWidth, img.width, settings.alignment);
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composites.push({ input: img.buffer, left, top: offset });
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offset += img.height + settings.gap;
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}
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}
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const maxCanvasPixels = env.MAX_CANVAS_PIXELS > 0 ? env.MAX_CANVAS_PIXELS : Infinity;
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if (canvasWidth * canvasHeight > maxCanvasPixels) {
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return reply.status(422).send({
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error: `Canvas too large: ${canvasWidth}x${canvasHeight} (${Math.round((canvasWidth * canvasHeight) / 1_000_000)}MP exceeds ${Math.round(maxCanvasPixels / 1_000_000)}MP limit)`,
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});
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}
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const background = parseHexColor(settings.backgroundColor);
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let pipeline = sharp({
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create: {
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width: canvasWidth,
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height: canvasHeight,
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channels: 4,
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background: { r: background.r, g: background.g, b: background.b, alpha: 1 },
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},
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}).composite(composites);
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if (settings.format === "jpeg") {
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pipeline = pipeline.jpeg({ quality: settings.quality });
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} else if (settings.format === "webp") {
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pipeline = pipeline.webp({ quality: settings.quality });
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} else if (settings.format === "avif") {
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pipeline = pipeline.avif({ quality: settings.quality, effort: 4 });
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} else if (settings.format === "jxl") {
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pipeline = pipeline.png();
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} else {
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pipeline = pipeline.png();
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}
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let result = await pipeline.toBuffer();
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if (settings.format === "jxl") {
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result = await encodeJxl(result, settings.quality);
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}
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if (settings.cornerRadius > 0) {
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const meta = await sharp(result).metadata();
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if (!meta.width || !meta.height) throw new Error("Cannot read image dimensions");
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const w = meta.width;
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const h = meta.height;
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const r = Math.min(settings.cornerRadius, Math.floor(Math.min(w, h) / 2));
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const mask = Buffer.from(
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`<svg width="${w}" height="${h}"><rect x="0" y="0" width="${w}" height="${h}" rx="${r}" ry="${r}" fill="white"/></svg>`,
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);
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result = await sharp(result)
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.ensureAlpha()
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.composite([{ input: mask, blend: "dest-in" }])
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.png()
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.toBuffer();
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if (settings.format === "jpeg") {
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result = await sharp(result)
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.flatten({ background: { r: background.r, g: background.g, b: background.b } })
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.jpeg({ quality: settings.quality })
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.toBuffer();
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} else if (settings.format === "webp") {
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result = await sharp(result).webp({ quality: settings.quality }).toBuffer();
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} else if (settings.format === "avif") {
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result = await sharp(result).avif({ quality: settings.quality, effort: 4 }).toBuffer();
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} else if (settings.format === "jxl") {
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result = await encodeJxl(result, settings.quality);
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}
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}
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const jobId = randomUUID();
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const filename = `stitch.${settings.format}`;
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await putObject(`outputs/${jobId}/${filename}`, result);
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return reply.send({
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jobId,
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downloadUrl: `/api/v1/download/${jobId}/${filename}`,
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originalSize: files.reduce((s, f) => s + f.buffer.length, 0),
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processedSize: result.length,
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});
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} catch (err) {
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return reply.status(422).send({
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error: "Stitch creation 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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function alignOffset(containerSize: number, itemSize: number, alignment: string): number {
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if (alignment === "start") return 0;
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if (alignment === "end") return containerSize - itemSize;
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return Math.round((containerSize - itemSize) / 2);
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}
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async function prepareForHorizontal(
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images: PreparedImage[],
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resizeMode: string,
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): Promise<PreparedImage[]> {
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if (resizeMode === "original") return images;
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const minHeight = Math.min(...images.map((m) => m.height));
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return Promise.all(
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images.map(async (img) => {
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if (img.height === minHeight && resizeMode === "fit") return img;
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if (resizeMode === "fit") {
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const scaledWidth = Math.round((img.width * minHeight) / img.height);
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const resized = await sharp(img.buffer).resize(scaledWidth, minHeight).toBuffer();
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return { buffer: resized, width: scaledWidth, height: minHeight };
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}
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if (resizeMode === "stretch") {
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const resized = await sharp(img.buffer)
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.resize(img.width, minHeight, { fit: "fill" })
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.toBuffer();
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return { buffer: resized, width: img.width, height: minHeight };
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}
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if (resizeMode === "crop") {
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const scaledWidth = Math.round((img.width * minHeight) / img.height);
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const resized = await sharp(img.buffer)
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.resize(scaledWidth, minHeight, { fit: "cover" })
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.toBuffer();
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return { buffer: resized, width: scaledWidth, height: minHeight };
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}
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return img;
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}),
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);
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}
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async function prepareForVertical(
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images: PreparedImage[],
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resizeMode: string,
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): Promise<PreparedImage[]> {
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if (resizeMode === "original") return images;
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const minWidth = Math.min(...images.map((m) => m.width));
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return Promise.all(
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images.map(async (img) => {
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if (img.width === minWidth && resizeMode === "fit") return img;
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if (resizeMode === "fit") {
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const scaledHeight = Math.round((img.height * minWidth) / img.width);
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const resized = await sharp(img.buffer).resize(minWidth, scaledHeight).toBuffer();
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return { buffer: resized, width: minWidth, height: scaledHeight };
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}
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if (resizeMode === "stretch") {
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const resized = await sharp(img.buffer)
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.resize(minWidth, img.height, { fit: "fill" })
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.toBuffer();
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return { buffer: resized, width: minWidth, height: img.height };
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}
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if (resizeMode === "crop") {
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const scaledHeight = Math.round((img.height * minWidth) / img.width);
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const resized = await sharp(img.buffer)
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.resize(minWidth, scaledHeight, { fit: "cover" })
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.toBuffer();
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return { buffer: resized, width: minWidth, height: scaledHeight };
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}
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return img;
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}),
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);
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}
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async function prepareForGrid(
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images: PreparedImage[],
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settings: { gridColumns: number; resizeMode: string },
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): Promise<PreparedImage[]> {
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if (settings.resizeMode === "original") return images;
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const medianWidth = median(images.map((m) => m.width));
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const medianHeight = median(images.map((m) => m.height));
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return Promise.all(
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images.map(async (img) => {
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if (settings.resizeMode === "fit") {
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const scale = Math.min(medianWidth / img.width, medianHeight / img.height);
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if (scale >= 1) return img;
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const newW = Math.round(img.width * scale);
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const newH = Math.round(img.height * scale);
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const resized = await sharp(img.buffer).resize(newW, newH).toBuffer();
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return { buffer: resized, width: newW, height: newH };
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}
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if (settings.resizeMode === "stretch") {
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const resized = await sharp(img.buffer)
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.resize(medianWidth, medianHeight, { fit: "fill" })
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.toBuffer();
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return { buffer: resized, width: medianWidth, height: medianHeight };
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}
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if (settings.resizeMode === "crop") {
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const resized = await sharp(img.buffer)
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.resize(medianWidth, medianHeight, { fit: "cover" })
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.toBuffer();
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return { buffer: resized, width: medianWidth, height: medianHeight };
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}
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return img;
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}),
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);
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}
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function median(values: number[]): number {
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const sorted = [...values].sort((a, b) => a - b);
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const mid = Math.floor(sorted.length / 2);
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return sorted.length % 2 === 0 ? Math.round((sorted[mid - 1] + sorted[mid]) / 2) : sorted[mid];
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}
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