site.ts

1import { createHash } from "node:crypto";2import { mkdirSync, rmSync, writeFileSync } from "node:fs";3import { join } from "node:path";4import type { Context, Hono } from "hono";5import { supportText } from "../pages/docs.ts";6import { html } from "../pages/html.ts";7import { setting } from "../server/db.ts";8import { type AdminContext, adminPage, formField, notice, textFields } from "./console.ts";9import { saveSettings } from "./store.ts";1011// The settings Phase 6's pages read, with their labels and length caps.12const FIELDS: [key: string, label: string, max: number][] = [13	["site_name", "site name", 100],14	["tagline", "tagline", 300],15	["branding", "branding text", 100],16	["handle", "handle", 39],17	["bio", "bio", 2000],18	["location", "location", 100],19	["link", "link", 500],20	["building_since", "building since", 100],21	["support_page", "support page (Markdown)", 4000],22];23const TEXTAREAS = new Set(["bio", "support_page"]);24const HANDLE = /^[A-Za-z0-9._-]+$/;25const HTTP_URL = /^https?:\/\/[^\s]+$/i;26// Under the 64 KiB body cap with room for the form's other fields; the docs promise 60 KB.27const MAX_SIGNATURE = 60 * 1024;28const OWN_SIGNATURE = /^signature-[0-9a-f]{16}\.(png|jpg|webp)$/;2930/**31 * The signature's type, from its first bytes, never its name or declared type. PNG, JPEG and WebP32 * only: SVG is refused, since it can carry script and links and would need a sandbox of its own.33 */34function imageType(bytes: Uint8Array): "png" | "jpg" | "webp" | null {35	const starts = (sig: number[], at = 0) => sig.every((byte, i) => bytes[at + i] === byte);36	if (starts([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])) return "png";37	if (starts([0xff, 0xd8, 0xff])) return "jpg";38	if (starts([0x52, 0x49, 0x46, 0x46]) && starts([0x57, 0x45, 0x42, 0x50], 8)) return "webp";39	return null;40}4142/** §24's Site and profile section, with the signature image stored under `data/assets/` (§19). */43export function registerSite(app: Hono, ctx: AdminContext): void {44	const assets = join(ctx.dataDir, "assets");45	app.get("/admin/site", (c) => c.html(sitePage(c, ctx, "")));4647	app.post("/admin/site", async (c) => {48		const fields = await textFields(c);49		const refuse = (error: string) => c.html(sitePage(c, ctx, error), 400);50		const values: Record<string, string> = {};51		for (const [key, label, max] of FIELDS) {52			values[key] = (fields[key] ?? "").trim();53			if (values[key].length > max) return refuse(`The ${label} is over ${max} characters.`);54		}55		if (values.handle && !HANDLE.test(values.handle)) {56			return refuse("A handle is letters, digits, '.', '_' and '-'.");57		}58		// Shown by default: the setting records only that it was switched off.59		values.support_off = fields.support === "1" ? "" : "1";60		if (values.link && !HTTP_URL.test(values.link)) {61			return refuse("The link must be an http or https address.");62		}63		const upload = (await c.req.parseBody()).signature;64		const previous = setting(ctx.kepr, "signature");65		if (upload instanceof File && upload.size > MAX_SIGNATURE) {66			return refuse("The signature must be under 60 KB.");67		}68		if (upload instanceof File && upload.size > 0) {69			const bytes = new Uint8Array(await upload.arrayBuffer());70			const type = imageType(bytes);71			if (!type) return refuse("The signature must be a PNG, JPEG or WebP image.");72			// Named by content, so the hour-long /static cache never serves an old signature.73			const hash = createHash("sha256").update(bytes).digest("hex").slice(0, 16);74			values.signature = `signature-${hash}.${type}`;75			mkdirSync(assets, { recursive: true });76			writeFileSync(join(assets, values.signature), bytes);77		} else if (fields.remove_signature === "1") {78			values.signature = "";79		}80		saveSettings(ctx.kepr, values);81		// Only a file this console wrote is removed, whatever the setting holds.82		if (83			previous &&84			OWN_SIGNATURE.test(previous) &&85			values.signature !== undefined &&86			previous !== values.signature87		) {88			rmSync(join(assets, previous), { force: true });89		}90		return c.redirect("/admin/site", 303);91	});92}9394function sitePage(c: Context, ctx: AdminContext, error: string): string {95	const signature = setting(ctx.kepr, "signature");96	// The support page's box starts from the words it shows today.97	const value = (key: string) =>98		key === "support_page" ? supportText(ctx.kepr) : (setting(ctx.kepr, key) ?? "");99	const input = ([key, label, max]: (typeof FIELDS)[number]) =>100		html`<label class="issues-label" for="${key}">${label}</label>101${102	TEXTAREAS.has(key)103		? html`<textarea class="issues-textarea" id="${key}" name="${key}" rows="${key === "bio" ? 4 : 12}"104maxlength="${max}">${value(key)}</textarea>`105		: html`<input class="issues-input" id="${key}" name="${key}" maxlength="${max}"106value="${value(key)}">`107}`;108	const body = html`${notice(error)}109<form class="issues-form" method="post" action="/admin/site" enctype="multipart/form-data">110${formField(c)}111${FIELDS.map(input)}112<label class="issues-label"><input type="checkbox" name="support" value="1"${113		!setting(ctx.kepr, "support_off") && " checked"114	}>115show the support page</label>116<label class="issues-label" for="signature">signature image117<span class="muted">(PNG, JPEG or WebP, under 60 KB)</span></label>118${signature && html`<img class="profile-signature" src="/static/assets/${encodeURIComponent(signature)}" alt="current signature">`}119<input class="issues-input" id="signature" name="signature" type="file" accept="image/png,image/jpeg,image/webp">120${121	signature &&122	html`<label class="issues-label"><input type="checkbox" name="remove_signature" value="1">123remove the signature</label>`124}125<button class="issues-submit" type="submit">save</button>126</form>`;127	return adminPage(c, ctx, "site and profile", body);128}