Convert social screenshots to JPEG without a second browser capture

This commit is contained in:
Matt Isenhower
2026-09-07 13:19:31 -07:00
parent 50156e96e1
commit a87855644d
9 changed files with 664 additions and 18 deletions

556
package-lock.json generated
View File

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"@img/sharp-linux-arm": "0.35.4",
"@img/sharp-linux-arm64": "0.35.4",
"@img/sharp-linux-ppc64": "0.35.4",
"@img/sharp-linux-riscv64": "0.35.4",
"@img/sharp-linux-s390x": "0.35.4",
"@img/sharp-linux-x64": "0.35.4",
"@img/sharp-linuxmusl-arm64": "0.35.4",
"@img/sharp-linuxmusl-x64": "0.35.4",
"@img/sharp-webcontainers-wasm32": "0.35.4",
"@img/sharp-win32-arm64": "0.35.4",
"@img/sharp-win32-ia32": "0.35.4",
"@img/sharp-win32-x64": "0.35.4"
},
"peerDependenciesMeta": {
"@types/node": {
"optional": true
}
}
},
"node_modules/sharp/node_modules/semver": {
"version": "7.8.5",
"resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
"integrity": "sha512-Y7/KDsb8LjooZpwaqGyulO6DQlksgCncchHGk+sZIY4SBvUocMBEFH5Ur1fI4dV+Jvl0w6cjvucaIi40puRioA==",
"license": "ISC",
"bin": {
"semver": "bin/semver.js"
},
"engines": {
"node": ">=10"
}
},
"node_modules/shebang-command": {
"version": "2.0.0",
"resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",

View File

@@ -6,6 +6,10 @@
"#cdn-images": {
"workerd": "./src/common/cdn.worker.js",
"default": "./src/common/cdn.node.js"
},
"#image-converter": {
"workerd": "./src/app/screenshots/convert.worker.js",
"default": "./src/app/screenshots/convert.node.js"
}
},
"engines": {
@@ -53,6 +57,7 @@
"lodash": "^4.18.1",
"mkdirp": "^3.0.1",
"moment-timezone": "^0.6.3",
"sharp": "^0.35.4",
"v-click-outside": "^3.0.1",
"vue": "^2.7.16",
"vue-clipboard2": "^0.3.1",

View File

@@ -0,0 +1,6 @@
import sharp from 'sharp';
// Node-only adapter; package imports keep native sharp out of the Worker bundle.
export async function convertToJpeg(png) {
return new Uint8Array(await sharp(png).flatten({ background: '#ffffff' }).jpeg({ quality: 90 }).toBuffer());
}

View File

@@ -0,0 +1,8 @@
import { env } from 'cloudflare:workers';
export async function convertToJpeg(png, images = env.IMAGES) {
let result = await images.input(new Response(png).body)
.transform({ background: '#ffffff' })
.output({ format: 'image/jpeg', quality: 90 });
return new Uint8Array(await result.response().arrayBuffer());
}

View File

@@ -1,3 +1,4 @@
import { convertToJpeg } from '#image-converter';
import { getTopOfCurrentHour } from '../../../common/time.js';
import { pngSize } from '../../../common/png.js';
@@ -49,14 +50,14 @@ export default class SocialPostBase {
let results = [];
let text = await this.getText(data);
let time = await this.getDataTime();
let image = await this.getMedia(data, 'image/png');
let image = await this.getMedia(data);
await this.maybeSavePublicImage(data, image.file);
let media = { 'image/png': image };
for (let client of clients) {
try {
let mediaType = client.mediaType ?? 'image/png';
media[mediaType] ??= await this.getMedia(data, mediaType);
media[mediaType] ??= await this.convertMedia(image, mediaType);
await client.send({ status: text, media: [media[mediaType]] });
await this.updateLastPostTime(client, time);
results.push({ client: client.key, ok: true });
@@ -87,7 +88,7 @@ export default class SocialPostBase {
}
let key = this.getTestScreenshotKey();
let { file } = await this.getMedia(data, 'image/png');
let { file } = await this.getMedia(data);
await this.publicStorage.writeBytes(key, file);
this.info(`Saved screenshot as ${key}`);
@@ -198,9 +199,8 @@ export default class SocialPostBase {
async getImage(data, format) { }
// The image as a media attachment: { file, type, width?, height? }
async getMedia(data, mediaType) {
let format = mediaType === 'image/jpeg' ? 'jpeg' : 'png';
let result = await this.getImage(data, format);
async getMedia(data) {
let result = await this.getImage(data, 'png');
if (result instanceof Uint8Array) {
let size = pngSize(result) ?? {};
@@ -210,6 +210,12 @@ export default class SocialPostBase {
return { file: result.image, type: result.type, width: result.width, height: result.height };
}
async convertMedia(image, mediaType) {
if (mediaType !== 'image/jpeg')
throw new Error(`Unsupported social image type: ${mediaType}`);
return { ...image, file: await convertToJpeg(image.file), type: mediaType };
}
// The filename to store the image as (optional)
getPublicImageFilename() { }

View File

@@ -1,5 +1,6 @@
import { test, beforeEach } from 'node:test';
import assert from 'node:assert/strict';
import sharp from 'sharp';
import SocialPostBase from '../../src/app/social/posts/SocialPostBase.js';
import { storage, fakeClient, json, seed } from './support.js';
@@ -64,18 +65,45 @@ test('a failing client does not record a post time and does not block the other
assert.deepEqual(await json(s.privateBucket, 'other-lastPostTimes.json'), { hourly: 3600 });
});
test('renders once per media type a client needs, with size from the screenshot', async () => {
test('captures one PNG and converts it once for JPEG clients, preserving dimensions', async () => {
const png = await sharp({ create: { width: 2, height: 1, channels: 3, background: '#ff0000' } }).png().toBuffer();
class ScreenshotPost extends HourlyPost {
async getImage(data, format) { this.images++; return { image: new Uint8Array([format === 'jpeg' ? 2 : 1]), type: format === 'jpeg' ? 'image/jpeg' : 'image/png', width: 2432, height: 1368 }; }
async getImage(data, format) {
assert.equal(format, 'png');
this.images++;
return { image: png, type: 'image/png', width: 2, height: 1 };
}
}
const jpegClient = fakeClient('bluesky'); jpegClient.mediaType = 'image/jpeg';
const post = new ScreenshotPost(s, [jpegClient, other]);
await post.maybePost();
bluesky.mediaType = 'image/jpeg';
const secondJpeg = fakeClient('second'); secondJpeg.mediaType = 'image/jpeg';
const post = new ScreenshotPost(s, [bluesky, other, secondJpeg]);
assert.equal((await post.maybePost()).ok, true);
assert.equal(post.images, 1);
const jpeg = bluesky.sent[0].media[0];
assert.equal(jpeg.type, 'image/jpeg');
assert.equal(jpeg.width, 2);
assert.equal(jpeg.height, 1);
const decoded = await sharp(jpeg.file).metadata();
assert.equal(decoded.format, 'jpeg');
assert.equal(decoded.width, 2);
assert.equal(decoded.height, 1);
assert.equal(secondJpeg.sent[0].media[0], jpeg);
assert.deepEqual(other.sent[0].media[0].file, png);
assert.deepEqual(new Uint8Array(await (await s.publicBucket.get('twitter-images/hourly.png')).arrayBuffer()), new Uint8Array(png));
});
assert.equal(post.images, 2); // one PNG public copy, one JPEG for Bluesky
assert.deepEqual(jpegClient.sent[0].media, [{ file: new Uint8Array([2]), type: 'image/jpeg', width: 2432, height: 1368 }]);
assert.deepEqual(other.sent[0].media, [{ file: new Uint8Array([1]), type: 'image/png', width: 2432, height: 1368 }]);
assert.deepEqual(new Uint8Array(await (await s.publicBucket.get('twitter-images/hourly.png')).arrayBuffer()), new Uint8Array([1]));
test('conversion failure preserves the PNG and does not checkpoint or send the JPEG post', async () => {
bluesky.mediaType = 'image/jpeg';
const post = new HourlyPost(s, [bluesky, other]);
post.convertMedia = async () => { throw new Error('Images quota exceeded'); };
const result = await post.maybePost();
assert.equal(result.ok, false);
assert.match(result.clients[0].error, /Images quota exceeded/);
assert.equal(bluesky.sent.length, 0);
assert.equal(other.sent.length, 1);
assert.equal(post.images, 1);
assert.ok(await s.publicBucket.get('twitter-images/hourly.png'));
assert.equal(await json(s.privateBucket, 'bluesky-lastPostTimes.json'), null);
});
test('with no data there is nothing to post', async () => {

View File

@@ -49,6 +49,18 @@ to preserve existing URLs; that legacy directory name does not enable X posting.
With no Bluesky credentials the runner generates public images only. Shadow
runs still update some private state, including the remembered Salmon Run shift.
Each post captures one PNG. The public copy stays in R2; when Bluesky needs
JPEG, the Worker's `IMAGES` binding converts those same PNG bytes at quality 90.
The local Node runner uses `sharp` through a conditional package import, keeping
native dependencies out of the Worker bundle. Conversion failures fail that
client's post without advancing its timestamp; no second browser capture is used.
Public-image-only shadow runs do not request conversions.
The Images Free plan includes 5,000 unique transformations per month; on that
plan, new transformations beyond the quota fail instead of incurring charges.
This uses transformations only, not paid Images storage. See
[Images pricing](https://developers.cloudflare.com/images/pricing/).
Browser Rendering opens `SITE_URL/screenshots.html`. Before rendering or
posting, the Worker compares that site's five data JSON files and English
localization against its own public bucket. A mismatch fails the run so the

View File

@@ -0,0 +1,30 @@
import { expect, it, vi } from 'vitest';
import { env } from 'cloudflare:test';
import { convertToJpeg } from '../../src/app/screenshots/convert.worker.js';
it('converts a PNG through the local Images binding without changing its dimensions', async () => {
const png = Uint8Array.from(atob('iVBORw0KGgoAAAANSUhEUgAAAAIAAAABCAIAAAB7QOjdAAAACXBIWXMAAAPoAAAD6AG1e1JrAAAAD0lEQVQImWP4z8Dwn4EBAAj+Af/KOtJRAAAAAElFTkSuQmCC'), c => c.charCodeAt(0));
const jpeg = await convertToJpeg(png);
expect([...jpeg.slice(0, 3)]).toEqual([255, 216, 255]);
const info = await env.IMAGES.info(new Response(jpeg).body);
expect(info.width).toBe(2);
expect(info.height).toBe(1);
});
it('passes the original PNG bytes to Images and returns JPEG bytes', async () => {
const png = new Uint8Array([137, 80, 78, 71]);
const jpeg = new Uint8Array([255, 216, 255]);
let source;
const output = vi.fn(async () => ({ response: () => new Response(jpeg) }));
const transform = vi.fn(() => ({ output }));
const images = { input: stream => { source = stream; return { transform }; } };
expect(await convertToJpeg(png, images)).toEqual(jpeg);
expect(new Uint8Array(await new Response(source).arrayBuffer())).toEqual(png);
expect(transform).toHaveBeenCalledWith({ background: '#ffffff' });
expect(output).toHaveBeenCalledWith({ format: 'image/jpeg', quality: 90 });
});
it('propagates Images failures to the posting pipeline', async () => {
const images = { input: () => ({ transform: () => ({ output: async () => { throw new Error('Images quota exceeded'); } }) }) };
await expect(convertToJpeg(new Uint8Array([1]), images)).rejects.toThrow('Images quota exceeded');
});

View File

@@ -30,6 +30,7 @@
// The API token is a secret (CLOUDFLARE_BROWSER_RUN_API_TOKEN).
"SITE_URL": "https://splatoon2.ink"
},
"images": { "binding": "IMAGES" },
"r2_buckets": [
{
// Shadow mode: writes go to the dev bucket while the container still owns production.