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| 1 | +export type ClientAccessMode = "off" | "enforce"; |
| 2 | + |
| 3 | +export interface ClientAccessConfig { |
| 4 | + mode: ClientAccessMode; |
| 5 | + deniedClients: string[]; |
| 6 | +} |
| 7 | + |
| 8 | +export interface DeclaredClient { |
| 9 | + name: string; |
| 10 | + title?: string; |
| 11 | + version?: string; |
| 12 | + identities: string[]; |
| 13 | +} |
| 14 | + |
| 15 | +export interface ClientAccessDecision { |
| 16 | + allowed: boolean; |
| 17 | + reason: "disabled" | "allowed" | "denied_client"; |
| 18 | + matchedClient?: string; |
| 19 | +} |
| 20 | + |
| 21 | +export function extractDeclaredClient(body: unknown): DeclaredClient | undefined { |
| 22 | + if (!isRecord(body) || body.method !== "initialize") return undefined; |
| 23 | + const params = body.params; |
| 24 | + if (!isRecord(params)) return undefined; |
| 25 | + const clientInfo = params.clientInfo; |
| 26 | + if (!isRecord(clientInfo)) return undefined; |
| 27 | + |
| 28 | + const name = sanitizeText(clientInfo.name); |
| 29 | + if (!name) return undefined; |
| 30 | + const title = sanitizeText(clientInfo.title); |
| 31 | + const version = sanitizeText(clientInfo.version); |
| 32 | + const identities = clientIdentities(name, title); |
| 33 | + |
| 34 | + return { |
| 35 | + name, |
| 36 | + ...(title ? { title } : {}), |
| 37 | + ...(version ? { version } : {}), |
| 38 | + identities, |
| 39 | + }; |
| 40 | +} |
| 41 | + |
| 42 | +export function evaluateClientAccess( |
| 43 | + config: ClientAccessConfig, |
| 44 | + client: DeclaredClient | undefined, |
| 45 | +): ClientAccessDecision { |
| 46 | + if (config.mode === "off") { |
| 47 | + return { allowed: true, reason: "disabled" }; |
| 48 | + } |
| 49 | + |
| 50 | + const identities = new Set(client?.identities ?? []); |
| 51 | + const deniedClient = normalizedPolicyEntries(config.deniedClients).find((entry) => |
| 52 | + identities.has(entry), |
| 53 | + ); |
| 54 | + if (deniedClient) { |
| 55 | + return { |
| 56 | + allowed: false, |
| 57 | + reason: "denied_client", |
| 58 | + matchedClient: deniedClient, |
| 59 | + }; |
| 60 | + } |
| 61 | + |
| 62 | + return { |
| 63 | + allowed: true, |
| 64 | + reason: "allowed", |
| 65 | + }; |
| 66 | +} |
| 67 | + |
| 68 | +function clientIdentities(name: string, title?: string): string[] { |
| 69 | + const identities = new Set<string>(); |
| 70 | + const normalizedName = normalizeClientName(name); |
| 71 | + if (normalizedName) identities.add(normalizedName); |
| 72 | + |
| 73 | + const combined = `${name} ${title ?? ""}`.toLowerCase(); |
| 74 | + if (/\bcodex\b/.test(combined) || normalizedName.includes("codex")) identities.add("codex"); |
| 75 | + if (combined.includes("chatgpt") || normalizedName.includes("chatgpt")) identities.add("chatgpt"); |
| 76 | + |
| 77 | + return [...identities]; |
| 78 | +} |
| 79 | + |
| 80 | +function normalizedPolicyEntries(entries: string[]): string[] { |
| 81 | + return [...new Set(entries.map(normalizeClientName).filter(Boolean))]; |
| 82 | +} |
| 83 | + |
| 84 | +function normalizeClientName(value: string): string { |
| 85 | + return value |
| 86 | + .trim() |
| 87 | + .toLowerCase() |
| 88 | + .replace(/[^a-z0-9]+/g, "-") |
| 89 | + .replace(/^-+|-+$/g, ""); |
| 90 | +} |
| 91 | + |
| 92 | +function sanitizeText(value: unknown): string | undefined { |
| 93 | + if (typeof value !== "string") return undefined; |
| 94 | + const normalized = value.replace(/[\r\n\t]+/g, " ").trim(); |
| 95 | + if (!normalized) return undefined; |
| 96 | + return normalized.slice(0, 160); |
| 97 | +} |
| 98 | + |
| 99 | +function isRecord(value: unknown): value is Record<string, unknown> { |
| 100 | + return typeof value === "object" && value !== null && !Array.isArray(value); |
| 101 | +} |
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