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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556// POST /api/like: records one like and sends the visitor back to the post.// there is no GET handler on purpose, so crawlers and link prefetchers can// never add a like.
import { isLikeable, voterId } from "../_lib/likes.js";
// voter rows only matter for the day they were made; keep two days so the// purge never races utc midnightconst VOTER_TTL_MS = 2 * 24 * 60 * 60 * 1000;
export async function onRequestPost(context) { const { request, env } = context;
let path; try { path = (await request.formData()).get("path"); } catch { return plain("bad request", 400); } if (typeof path !== "string" || !isLikeable(path)) { return plain("bad request", 400); }
// no counter rows for pages that don't exist const { origin } = new URL(request.url); const exists = await env.ASSETS.fetch(new Request(origin + path)); if (exists.status !== 200) { return plain("not found", 404); }
const now = new Date(); const voter = await voterId(env.SOCIAL_SECRET, request); const cutoff = new Date(now.getTime() - VOTER_TTL_MS).toISOString();
const [inserted] = await env.DB.batch([ env.DB .prepare("INSERT OR IGNORE INTO LikeVoters (page, voter, created_at) VALUES (?, ?, ?)") .bind(path, voter, now.toISOString()), env.DB.prepare("DELETE FROM LikeVoters WHERE created_at < ?").bind(cutoff), ]);
// a repeat like today is a silent no-op if (inserted.meta.changes === 1) { await env.DB .prepare("INSERT INTO Likes (page, count) VALUES (?, 1) ON CONFLICT(page) DO UPDATE SET count = count + 1") .bind(path) .run(); }
return new Response(null, { status: 303, headers: { Location: path + "#likes" } });}
function plain(body, status) { return new Response(body, { status, headers: { "Content-Type": "text/plain; charset=utf-8" } });}