1import { beforeAll, describe, expect, test } from "bun:test";2import { writeFile } from "node:fs/promises";3import { join } from "node:path";4import { openBucket } from "../src/bucket/reader.ts";5import {6 checkFormat,7 listEventIds,8 listRepos,9 readEvent,10 readHead,11 readObject,12 readSave,13} from "../src/bucket/repo.ts";14import { type Fixture, makeKohBucket } from "./fixture.ts";1516let fx: Fixture;17beforeAll(async () => {18 fx = await makeKohBucket();19});2021const bucket = () => openBucket({ kind: "folder", path: fx.bucketDir });2223describe("reading a koh3-produced folder remote", () => {24 test("lists the repo", async () => {25 expect(await listRepos(bucket())).toEqual([fx.repo]);26 });2728 test("reads format, head, the save record and one verified object end to end", async () => {29 const b = bucket();30 await checkFormat(b, fx.repo);31 const head = await readHead(b, fx.repo);32 expect(head).toBe(fx.saveIds[0] as string);3334 const save = await readSave(b, fx.repo, head as string);35 expect(save.message).toBe("say hello");36 expect(save.is_checkpoint).toBe(false);37 const checkpoint = await readSave(b, fx.repo, save.parent);38 expect(checkpoint.is_checkpoint).toBe(true);39 const first = await readSave(b, fx.repo, checkpoint.parent);40 expect([first.agent, first.session]).toEqual(["test-agent", "fixture"]);4142 const main = save.files.find((file) => file.path === "src/main.ts");43 const { bytes } = await readObject(b, fx.repo, main?.hash as string);44 expect(new TextDecoder().decode(bytes)).toBe("// Entry point.\nconsole.log('hello');\n");45 });4647 test("a missing key reads as null and a listing is prefix-scoped", async () => {48 const b = bucket();49 expect(await b.get(`${fx.repo}/nothing-here`)).toBeNull();50 const saves = await b.list(`${fx.repo}/saves/`);51 expect(saves.sort()).toEqual(fx.saveIds.map((id) => `${fx.repo}/saves/${id}`).sort());52 });53});5455test("the S3 reader pages through listings and reads a missing key as null", async () => {56 const pageSize = 2;57 const server = Bun.serve({58 port: 0,59 async fetch(req) {60 const url = new URL(req.url);61 const folder = bucket();62 if (url.searchParams.get("list-type") === "2") {63 const all = await folder.list(url.searchParams.get("prefix") ?? "");64 const start = Number(url.searchParams.get("continuation-token") ?? 0);65 const page = all.slice(start, start + pageSize);66 const more = start + pageSize < all.length;67 const contents = page.map((key) => `<Contents><Key>${key}</Key></Contents>`).join("");68 const next = more69 ? `<NextContinuationToken>${start + pageSize}</NextContinuationToken>`70 : "";71 return new Response(72 `<ListBucketResult><IsTruncated>${more}</IsTruncated>${contents}${next}</ListBucketResult>`,73 );74 }75 const bytes = await folder.get(url.pathname.replace("/kohbucket/", ""));76 if (bytes) return new Response(bytes);77 return new Response("<Error><Code>NoSuchKey</Code></Error>", { status: 404 });78 },79 });80 try {81 const s3 = openBucket({82 kind: "s3",83 endpoint: `http://localhost:${server.port}`,84 name: "kohbucket",85 region: "fr-par",86 accessKeyId: "read",87 secretAccessKey: "only",88 });89 expect(await s3.list(`${fx.repo}/`)).toEqual(await bucket().list(`${fx.repo}/`));90 expect(await readHead(s3, fx.repo)).toBe(fx.saveIds[0] as string);91 expect(await s3.get(`${fx.repo}/format`)).toBeNull();92 } finally {93 server.stop();94 }95});9697describe("the format rule", () => {98 test("accepts koh-remote 1 and refuses anything else", async () => {99 const { bucketDir, repo } = await makeKohBucket("formatted");100 const b = openBucket({ kind: "folder", path: bucketDir });101 await writeFile(join(bucketDir, repo, "format"), "koh-remote 1");102 await checkFormat(b, repo);103 await writeFile(join(bucketDir, repo, "format"), "koh-remote 2");104 await expect(checkFormat(b, repo)).rejects.toThrow('remote format "koh-remote 2"');105 });106});107108describe("object verification", () => {109 test("refuses an object whose content does not match its key", async () => {110 const b = bucket();111 const save = await readSave(b, fx.repo, fx.saveIds[0] as string);112 const [one, two] = save.files;113 const swapped = {114 ...b,115 get: (key: string) => b.get(key.replace(one?.hash ?? "", two?.hash ?? "")),116 };117 await expect(readObject(swapped, fx.repo, one?.hash as string)).rejects.toThrow(118 "does not match its hash",119 );120 });121});122123describe("untrusted input", () => {124 125 async function readTampered(change: (record: Record<string, unknown>) => void) {126 const id = fx.saveIds[0] as string;127 const real = await bucket().get(`${fx.repo}/saves/${id}`);128 const record = JSON.parse(new TextDecoder().decode(real as Uint8Array));129 change(record);130 const bytes = new TextEncoder().encode(JSON.stringify(record));131 return readSave({ get: async () => bytes, list: async () => [] }, fx.repo, id);132 }133 const withPath = (path: string) => (record: Record<string, unknown>) => {134 (record.files as { path: string }[])[0] = { ...(record.files as { path: string }[])[0], path };135 };136137 test("the genuine record is accepted", async () => {138 expect((await readTampered(() => {})).message).toBe("say hello");139 });140141 test.each([142 "",143 "/etc/passwd",144 "../escape",145 "src/../../escape",146 "./src/main.ts",147 "src//main.ts",148 "src/",149 "src\\main.ts",150 "src/ma\0in.ts",151 "src/ma\nin.ts",152 ])("refuses the file path %p", async (path) => {153 await expect(readTampered(withPath(path))).rejects.toThrow("Koh 3 schema");154 });155156 test("refuses duplicate paths in one record", async () => {157 const dupe = (record: Record<string, unknown>) => {158 const files = record.files as { path: string }[];159 files[1] = { ...files[1], path: (files[0] as { path: string }).path } as { path: string };160 };161 await expect(readTampered(dupe)).rejects.toThrow("Koh 3 schema");162 });163164 test.each([165 ["parent", "not-an-id"],166 ["restores", "ABCDEF123456"],167 ["replayed_from", "../../../x"],168 ["created_at", -1],169 ["created_at", 1.5],170 ["size_bytes", -10],171 ["size_bytes", "12"],172 ])("refuses %s = %p", async (field, value) => {173 await expect(readTampered((record) => (record[field] = value))).rejects.toThrow("Koh 3 schema");174 });175176 test("refuses bad repo names and save IDs before building a key", async () => {177 const b = bucket();178 for (const repo of ["..", "a/b", "", "../demo"]) {179 await expect(checkFormat(b, repo)).rejects.toThrow("not a repo name");180 await expect(readHead(b, repo)).rejects.toThrow("not a repo name");181 await expect(readSave(b, repo, fx.saveIds[0] as string)).rejects.toThrow("not a repo name");182 await expect(readObject(b, repo, "0".repeat(64))).rejects.toThrow("not a repo name");183 }184 for (const id of ["../head", "abc", "ABCDEF123456", `${fx.saveIds[0]}0`]) {185 await expect(readSave(b, fx.repo, id)).rejects.toThrow("not a save ID");186 }187 });188});189190describe("event records", () => {191 test("reads a genuine koh3 flag event and refuses a tampered one", async () => {192 const b = bucket();193 const [id] = await listEventIds(b, fx.repo);194 const event = await readEvent(b, fx.repo, id as string);195 expect([event.kind, event.save_id, event.reason]).toEqual([196 "flag",197 fx.saveIds[3] as string,198 "holds a secret",199 ]);200 const stripAll = { kind: "strip", save_id: "", path: "secret.txt" };201 const accepted = new TextEncoder().encode(JSON.stringify({ ...event, ...stripAll }));202 const reader = { get: async () => accepted, list: async () => [] };203 expect((await readEvent(reader, fx.repo, event.id)).kind).toBe("strip");204 for (const change of [205 { kind: "delete" },206 { path: "../x" },207 { save_id: "nope" },208 { kind: "flag", save_id: "" },209 { kind: "clear", save_id: "" },210 { kind: "strip", path: "" },211 { kind: "strip", save_id: "", path: "" },212 ]) {213 const bytes = new TextEncoder().encode(JSON.stringify({ ...event, ...change }));214 const tampered = { get: async () => bytes, list: async () => [] };215 await expect(readEvent(tampered, fx.repo, event.id)).rejects.toThrow("Koh 3 schema");216 }217 });218});