claude-code over NATS: licence events, a token by request, a login pushed to the manager, MCP servers registered per node or mesh-wide
Events carry what happened and no secret; tokens travel on requests (design 32 §10). The manager's licence.rotated/switched events make the module ask anthropic-licence-manager.current; at start it asks once to catch up. A refresh token appearing in the credentials file is a login: it is pushed to the manager's adopt at once, sealed to the manager's key — the one time a refresh token travels. A switch replaces the old licence's grant whole, removes the API key and its helper, and rewrites oauthAccount in ~/.claude.json. New tools register and unregister MCP servers on this node, or with nodes: all / a list via an mcp.registered event every node consumes; called for one node, the answer names the other nodes running claude-code. 26 tests.
This commit is contained in:
jochen
@@ -0,0 +1,208 @@
|
||||
// What claude-code does on a node, written against two things it is handed — a way to ask a tool on the
|
||||
// bus and a way to emit an event — so every path is tested without a bus (novox/hq design 36 §4–§5,
|
||||
// ADR 0183, ADR 0198).
|
||||
//
|
||||
// **Over NATS, in two kinds** (design 32 §10): an event says that something happened and carries no
|
||||
// secret, because a stream keeps it; a token travels on a request, which nothing keeps. So:
|
||||
// - the licence manager's `licence.rotated` and `licence.switched` events tell this module to ask the
|
||||
// seat for its current token, sealed to the key it sends with the request;
|
||||
// - a login a person made here — a refresh token this module never writes — is offered to the seat at
|
||||
// once, sealed to the seat's key: the one moment a refresh token travels, because the login made the
|
||||
// manager's stale;
|
||||
// - an MCP server registered for more nodes than this one is an `mcp.registered` event every node's
|
||||
// claude-code consumes, so a node that was off takes it when it is back.
|
||||
|
||||
import { chmodSync, existsSync, readFileSync, rmSync, writeFileSync } from "node:fs";
|
||||
import { join } from "node:path";
|
||||
|
||||
import { render, entryProblem, MANAGED_DIR, type Binding, type Facts, type Settings, type Servers } from "./render.js";
|
||||
import { generateKeyPair, open, seal, type SealedBox } from "./seal.js";
|
||||
import { decideApply, grantOf, holdsLogin, readCredentials, replacedBy, withGrant, writeCredentials, type Grant } from "./grant.js";
|
||||
import { readIdentity, writeIdentity, type Identity } from "./identity.js";
|
||||
|
||||
export const SEAT = "anthropic-licence-manager";
|
||||
|
||||
export interface Paths {
|
||||
state: string;
|
||||
facts: string;
|
||||
settings: string;
|
||||
home: string;
|
||||
node: string;
|
||||
}
|
||||
|
||||
/** A tool on the bus: its address and arguments in, its JSON answer out. */
|
||||
export type Ask = (address: string, args: Record<string, unknown>) => Promise<unknown>;
|
||||
/** An event of this module's, by its local name. */
|
||||
export type Emit = (type: string, body: unknown) => Promise<void>;
|
||||
/** Write one managed file; answers what happened. */
|
||||
export type WriteManaged = (name: string, content: string) => string;
|
||||
|
||||
export const readJson = <T>(p: string, fallback: T): T => {
|
||||
try {
|
||||
return JSON.parse(readFileSync(p, "utf8")) as T;
|
||||
} catch {
|
||||
return fallback;
|
||||
}
|
||||
};
|
||||
|
||||
const credentialsPath = (p: Paths) => join(p.home, ".claude", ".credentials.json");
|
||||
const accountPath = (p: Paths) => join(p.home, ".claude.json");
|
||||
const bindingPath = (p: Paths) => join(p.state, "licence.json");
|
||||
const apiKeyPath = (p: Paths) => join(p.state, "api-key");
|
||||
export const helperPath = (p: Paths) => join(p.state, "api-key-helper");
|
||||
const keyPath = (p: Paths) => join(p.state, "key.pem");
|
||||
const pubPath = (p: Paths) => join(p.state, "key.pub.pem");
|
||||
const registryPath = (p: Paths) => join(p.state, "mcp-servers.json");
|
||||
|
||||
export function keypair(p: Paths): { publicKey: string; privateKey: string } {
|
||||
if (!existsSync(keyPath(p))) {
|
||||
const k = generateKeyPair();
|
||||
writeFileSync(keyPath(p), k.privateKey, { mode: 0o600 });
|
||||
writeFileSync(pubPath(p), k.publicKey, { mode: 0o644 });
|
||||
}
|
||||
return { privateKey: readFileSync(keyPath(p), "utf8"), publicKey: readFileSync(pubPath(p), "utf8") };
|
||||
}
|
||||
|
||||
export function registered(p: Paths): Servers {
|
||||
return readJson<Servers>(registryPath(p), {});
|
||||
}
|
||||
|
||||
export function renderNow(p: Paths, write: WriteManaged): string[] {
|
||||
const facts = readJson<Facts | null>(p.facts, null);
|
||||
if (!facts?.console) throw new Error(`the mesh has not rendered ${p.facts} yet; nothing to write`);
|
||||
const files = render(facts, readJson<Settings>(p.settings, {}), readJson<Binding | null>(bindingPath(p), null),
|
||||
helperPath(p), registered(p));
|
||||
return Object.entries(files).map(([name, content]) => write(name, content));
|
||||
}
|
||||
|
||||
// ---- the licence ----------------------------------------------------------------------------------
|
||||
|
||||
/** What the seat answers to `current`: the licence this node is bound to and its token, sealed. */
|
||||
export interface Current {
|
||||
licence: string;
|
||||
kind: "subscription" | "api-key";
|
||||
sealed: SealedBox;
|
||||
identity?: Identity | null;
|
||||
}
|
||||
|
||||
/** Ask the seat for this node's current token and apply it. */
|
||||
export async function pull(p: Paths, ask: Ask, write: WriteManaged): Promise<Record<string, unknown>> {
|
||||
const answer = (await ask(`${SEAT}.current`, { node: p.node, public_key: keypair(p).publicKey })) as Current | null;
|
||||
if (!answer?.sealed) return { applied: false, reason: "the seat holds no licence for this node" };
|
||||
return apply(p, answer, write);
|
||||
}
|
||||
|
||||
/** Apply what the seat handed over. A switch replaces the grant whole and cleans up after the old licence. */
|
||||
export function apply(p: Paths, handed: Current, write: WriteManaged): Record<string, unknown> {
|
||||
const plain = open(handed.sealed, keypair(p).privateKey);
|
||||
const previous = readJson<Binding | null>(bindingPath(p), null);
|
||||
const switched = previous?.licence !== handed.licence;
|
||||
let outcome: Record<string, unknown> = { applied: true, licence: handed.licence, kind: handed.kind, switched };
|
||||
if (handed.kind === "api-key") {
|
||||
writeFileSync(apiKeyPath(p), plain.trim() + "\n", { mode: 0o600 });
|
||||
writeFileSync(helperPath(p), `#!/bin/sh\nexec cat '${apiKeyPath(p)}'\n`, { mode: 0o700 });
|
||||
chmodSync(helperPath(p), 0o700);
|
||||
} else {
|
||||
const grant = JSON.parse(plain) as Grant;
|
||||
const local = readCredentials(credentialsPath(p));
|
||||
const d = decideApply(grantOf(local), grant, switched ? "switch" : "rotation");
|
||||
if (d.apply) writeCredentials(credentialsPath(p), switched ? replacedBy(local, grant) : withGrant(local, grant));
|
||||
else outcome = { applied: false, licence: handed.licence, reason: d.reason };
|
||||
// Away from the API key: it goes, with its helper.
|
||||
rmSync(apiKeyPath(p), { force: true });
|
||||
rmSync(helperPath(p), { force: true });
|
||||
}
|
||||
if (switched && handed.identity?.accountUuid) {
|
||||
outcome.account = writeIdentity(accountPath(p), handed.identity) ? "updated" : "unchanged";
|
||||
}
|
||||
writeFileSync(bindingPath(p), JSON.stringify({ licence: handed.licence, kind: handed.kind }) + "\n", { mode: 0o600 });
|
||||
try {
|
||||
outcome.rendered = renderNow(p, write); // the key-helper comes or goes with the licence's kind
|
||||
} catch (err) {
|
||||
outcome.rendered = { failed: err instanceof Error ? err.message : String(err) };
|
||||
}
|
||||
return outcome;
|
||||
}
|
||||
|
||||
/** A licence event from the manager: is it for this node? */
|
||||
export function concerns(p: Paths, type: string, body: { licence?: string; node?: string }): boolean {
|
||||
if (type.endsWith("licence.switched")) return body.node === p.node;
|
||||
if (type.endsWith("licence.rotated")) return body.licence === readJson<Binding | null>(bindingPath(p), null)?.licence;
|
||||
return false;
|
||||
}
|
||||
|
||||
/** A refresh token in the credentials file is a login: this module never writes one. Offer it to the seat. */
|
||||
export async function offerLogin(p: Paths, ask: Ask): Promise<Record<string, unknown> | null> {
|
||||
const creds = readCredentials(credentialsPath(p));
|
||||
if (!holdsLogin(creds)) return null;
|
||||
const key = (await ask(`${SEAT}.public_key`, {})) as { public_key?: string } | null;
|
||||
if (!key?.public_key) throw new Error("the licence manager did not say what key to seal a login to");
|
||||
return (await ask(`${SEAT}.adopt`, {
|
||||
node: p.node,
|
||||
identity: readIdentity(accountPath(p)),
|
||||
sealed: seal(JSON.stringify(creds!.claudeAiOauth), key.public_key),
|
||||
})) as Record<string, unknown>;
|
||||
}
|
||||
|
||||
// ---- MCP servers ----------------------------------------------------------------------------------
|
||||
|
||||
export interface Registration {
|
||||
name: string;
|
||||
entry?: Record<string, unknown>;
|
||||
/** Which nodes: this one (absent), every node running the module ("all"), or a list. */
|
||||
nodes?: "all" | string[];
|
||||
}
|
||||
|
||||
function setRegistered(p: Paths, name: string, entry: Record<string, unknown> | null): boolean {
|
||||
const list = { ...registered(p) } as Record<string, Record<string, unknown>>;
|
||||
const before = JSON.stringify(list[name] ?? null);
|
||||
if (entry) list[name] = entry;
|
||||
else delete list[name];
|
||||
if (JSON.stringify(list[name] ?? null) === before) return false;
|
||||
writeFileSync(registryPath(p), JSON.stringify(list, null, 2) + "\n", { mode: 0o600 });
|
||||
return true;
|
||||
}
|
||||
|
||||
const targets = (p: Paths, nodes: Registration["nodes"]) =>
|
||||
nodes === "all" ? true : Array.isArray(nodes) ? nodes.includes(p.node) : false;
|
||||
|
||||
/** Register (or with no entry, unregister) here, and announce it for the other nodes asked for. */
|
||||
export async function registerServer(p: Paths, r: Registration, emit: Emit, write: WriteManaged,
|
||||
others: () => Promise<string[]>): Promise<Record<string, unknown>> {
|
||||
if (r.entry) {
|
||||
const problem = entryProblem(r.name, r.entry);
|
||||
if (problem) return { registered: false, reason: problem };
|
||||
}
|
||||
const here = r.nodes === undefined || targets(p, r.nodes);
|
||||
const changed = here ? setRegistered(p, r.name, r.entry ?? null) : false;
|
||||
const rendered = here && changed ? renderNow(p, write) : [];
|
||||
if (r.nodes !== undefined) {
|
||||
await emit(r.entry ? "mcp.registered" : "mcp.unregistered", { name: r.name, entry: r.entry ?? null, nodes: r.nodes });
|
||||
}
|
||||
const answer: Record<string, unknown> = {
|
||||
[r.entry ? "registered" : "unregistered"]: r.name,
|
||||
on: r.nodes === undefined ? [p.node] : r.nodes,
|
||||
here: here ? (changed ? "changed" : "already so") : "not this node",
|
||||
rendered,
|
||||
};
|
||||
if (r.nodes === undefined) {
|
||||
// The question the operator wanted asked: here only, or more?
|
||||
const elsewhere = (await others().catch(() => [] as string[])).filter((n) => n !== p.node);
|
||||
answer.also = elsewhere.length
|
||||
? `claude-code also runs on ${elsewhere.join(", ")}. To ${r.entry ? "register" : "unregister"} it there too, call again with nodes: "all" or a list of those nodes.`
|
||||
: `To do the same on every node running claude-code, call again with nodes: "all".`;
|
||||
}
|
||||
return answer;
|
||||
}
|
||||
|
||||
/** An `mcp.registered`/`mcp.unregistered` event from any node's claude-code: apply it if it names this node. */
|
||||
export function onServerEvent(p: Paths, type: string, body: Registration, write: WriteManaged): string | null {
|
||||
if (!body?.name || !targets(p, body.nodes)) return null;
|
||||
const entry = type.endsWith("mcp.registered") ? body.entry ?? null : null;
|
||||
if (entry && entryProblem(body.name, entry)) return null;
|
||||
if (!setRegistered(p, body.name, entry)) return null;
|
||||
renderNow(p, write);
|
||||
return `${entry ? "registered" : "unregistered"} ${body.name} from an event`;
|
||||
}
|
||||
|
||||
export { MANAGED_DIR };
|
||||
Reference in New Issue
Block a user