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77 lines
3.1 KiB
TypeScript
77 lines
3.1 KiB
TypeScript
/**
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* Bulwark's own data in JMAP metadata (urn:ietf:params:jmap:metadata) of an
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* account's Inbox: shared tag definitions and team templates in a group
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* account, personal templates in the user's own account.
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*
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* What Stalwart v1.0.0 does (local-data/org-features-facts.md):
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* - vendor namespaces need a dot ("org.bulwarkmail" works, "bulwark" is
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* refused); each namespace holds at most 8 KB, one mailbox at most 64 KB
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* of shared and 16 KB of private metadata;
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* - `metadata/<namespace>` patches one namespace and leaves the others;
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* - every member of a group account sees its shared metadata; private
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* metadata is per user.
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*
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* So every item gets a namespace of its own, `org.bulwarkmail.<key>`. 0.16
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* has no metadata, and a pre-release 1.0 build advertises it but drops the
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* connection on Mailbox/get with `metadata`; the calls go in a request of
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* their own and any failure means "not supported" for that account.
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*/
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export const METADATA_CAPABILITY = 'urn:ietf:params:jmap:metadata';
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export const BULWARK_NAMESPACE = 'org.bulwarkmail';
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/** Largest value Stalwart's default config takes in one namespace. */
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export const MAX_METADATA_ENTRY_BYTES = 8192;
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const KEY_RE = /^[a-z0-9][a-z0-9-]*(\.[a-z0-9][a-z0-9-]*)*$/;
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export class MetadataTooLargeError extends Error {
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constructor(message: string) {
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super(message);
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this.name = 'MetadataTooLargeError';
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}
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}
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export class MetadataUnsupportedError extends Error {
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constructor(message = 'This server keeps no metadata for Bulwark') {
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super(message);
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this.name = 'MetadataUnsupportedError';
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}
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}
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/** `tags`, `template.<id>`: lowercase, digits, dashes, dot-separated. */
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export function isValidMetadataKey(key: string): boolean {
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return key.length <= 120 && KEY_RE.test(key);
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}
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export function namespaceFor(key: string): string {
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if (!isValidMetadataKey(key)) throw new Error(`Invalid metadata key: ${key}`);
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return `${BULWARK_NAMESPACE}.${key}`;
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}
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/**
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* Whether the account's capabilities offer vendor-namespaced metadata on
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* mailboxes. Says nothing about whether the server really implements it.
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*/
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export function advertisesMailboxMetadata(accountCapabilities: Record<string, unknown> | undefined): boolean {
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const cap = accountCapabilities?.[METADATA_CAPABILITY] as
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| { dataTypes?: Record<string, { supportsVendorNamespaces?: boolean; supportsPrivate?: boolean }> }
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| undefined;
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return cap?.dataTypes?.Mailbox?.supportsVendorNamespaces === true;
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}
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/** Bulwark's entries of a `metadata` or `privateMetadata` object, by key. */
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export function bulwarkEntries(metadata: unknown): Record<string, unknown> {
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if (!metadata || typeof metadata !== 'object' || Array.isArray(metadata)) return {};
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const prefix = `${BULWARK_NAMESPACE}.`;
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const out: Record<string, unknown> = {};
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for (const [namespace, value] of Object.entries(metadata as Record<string, unknown>)) {
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if (namespace.startsWith(prefix)) out[namespace.slice(prefix.length)] = value;
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}
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return out;
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}
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/** The size Stalwart counts for a value: its JSON in UTF-8. */
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export function metadataValueBytes(value: unknown): number {
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return new TextEncoder().encode(JSON.stringify(value)).length;
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}
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