105 lines
2.8 KiB
TypeScript
105 lines
2.8 KiB
TypeScript
import { contentType } from "https://deno.land/std@0.202.0/media_types/mod.ts";
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import {
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Image,
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TextLayout,
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} from "https://deno.land/x/imagescript@1.2.15/ImageScript.js";
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const font = await fetch("https://static.pyrope.net/courier-std-bold.otf")
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.then((r) => r.arrayBuffer())
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.then((b) => new Uint8Array(b));
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function make_image(
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{ text, color = 0, outline_color = 0xff_ff_ff_ff }: {
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text: string;
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color?: number;
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outline_color?: number;
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},
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): Image {
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let image = Image.renderText(
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font,
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64,
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text,
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0,
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new TextLayout({ verticalAlign: "center", horizontalAlign: "middle" }),
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);
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const outline = Image.renderText(
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font,
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64,
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text,
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outline_color,
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new TextLayout({ verticalAlign: "center", horizontalAlign: "middle" }),
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);
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for (const hshift of [-2, 0, 2]) {
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for (const vshift of [-2, 0, 2]) {
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image = image.composite(outline, hshift, vshift);
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}
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}
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const text_img = Image.renderText(
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font,
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64,
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text,
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color,
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new TextLayout({ verticalAlign: "center", horizontalAlign: "middle" }),
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);
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const final = image.composite(text_img);
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return final.crop(0, 0, final.width, final.height - 22);
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}
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// the whole cache thing def sketches me out, but people probably won't be *that* malicious
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const MAX_PRN_LENGTH = 128;
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// shouldn't really be a problem
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const MAX_PRN_CHOICES = 256;
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// let's stick to hex even though BigInt() can handle prefixes (prefices?)
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const hex_string_to_color = (s: string): number | undefined => {
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const parsed = parseInt(s, 16);
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if (Number.isNaN(parsed)) return;
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// JANK! SORRY
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return Number((BigInt(parsed) << 8n) | 0xffn);
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};
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const image_response = (data: Uint8Array): Response =>
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new Response(data, {
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headers: { "Content-Type": contentType("png") },
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});
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Deno.serve({ port: 61265 }, async (req) => {
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const url = new URL(req.url);
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const params = url.searchParams;
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const prns = params.getAll("p");
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if (prns.some((p) => p.length > MAX_PRN_LENGTH)) {
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return new Response(`MAX_PRN_LENGTH = ${MAX_PRN_LENGTH}`, { status: 413 });
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}
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if (prns.length > MAX_PRN_CHOICES) {
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return new Response(`MAX_PRN_CHOICES = ${MAX_PRN_CHOICES}`, {
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status: 413,
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});
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}
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const prn = prns[Math.floor(Math.random() * prns.length)] ??
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"NONE, APPARENTLY";
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const fg_str = params.get("fg");
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const outline_str = params.get("outline");
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const sentence_id = params.get("sentence_id");
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const sentence_index = params.get("sentence_index");
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console.log(
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`${sentence_id}#${sentence_index}: chose ${prn} from ${prns}. ${fg_str} on ${outline_str}`,
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);
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const fg = hex_string_to_color(fg_str ?? "0");
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const outline = hex_string_to_color(outline_str ?? "ffffff");
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const resp = image_response(
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await make_image({ text: prn, color: fg, outline_color: outline }).encode(),
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);
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return resp;
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});
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