applesauce-wallet-connect/dist/helpers/support.js

NIP-47 Nostr Wallet Connect implementation for both clients and services.

import { getOrComputeCachedValue, getTagValue, isEvent } from "applesauce-core/helpers";
export const WALLET_INFO_KIND = 13194;
/** A symbol used to cache the wallet info on the event */
export const WalletInfoSymbol = Symbol("wallet-info");
/** Gets the wallet info from a kind 13194 event */
export function getWalletSupport(info) {
    if (info.kind !== WALLET_INFO_KIND)
        return null;
    return getOrComputeCachedValue(info, WalletInfoSymbol, () => {
        const content = info.content.trim();
        if (!content)
            return null;
        // Parse methods from content (space-separated)
        const contentParts = content.split(/\s+/);
        const methods = contentParts
            .filter((part) => [
            "pay_invoice",
            "multi_pay_invoice",
            "pay_keysend",
            "multi_pay_keysend",
            "make_invoice",
            "lookup_invoice",
            "list_transactions",
            "get_balance",
            "get_info",
            "notifications",
        ].includes(part))
            .filter((part) => part !== "notifications");
        // Parse encryption methods from encryption tag
        const encryptionTag = getTagValue(info, "encryption");
        const encryption = encryptionTag
            ? encryptionTag
                .split(/\s+/)
                .filter((method) => method === "nip44_v2" || method === "nip04")
            : ["nip04"]; // Default to nip04 if no encryption tag is present
        // Parse notifications from notifications tag
        const notificationsTag = getTagValue(info, "notifications");
        const notifications = notificationsTag
            ? notificationsTag
                .split(/\s+/)
                .filter((notif) => notif === "payment_received" || notif === "payment_sent")
            : undefined;
        return {
            methods,
            encryption,
            notifications,
        };
    });
}
/** Gets the encryption methods from a wallet info event */
export function getEncryptionMethods(info) {
    const walletInfo = isEvent(info) ? getWalletSupport(info) : info;
    return walletInfo?.encryption ?? [];
}
/** Checks if the wallet service supports a specific encryption method */
export function supportsEncryption(info, encryption) {
    const encryptionMethods = getEncryptionMethods(info);
    return encryptionMethods.includes(encryption);
}
/** Gets the preferred encryption method (nip44_v2 preferred over nip04) */
export function getPreferredEncryption(info) {
    const encryptionMethods = getEncryptionMethods(info);
    if (encryptionMethods.length === 0)
        return "nip04";
    // Prefer nip44_v2 over nip04
    if (encryptionMethods.includes("nip44_v2"))
        return "nip44_v2";
    if (encryptionMethods.includes("nip04"))
        return "nip04";
    // Absence of this tag implies that the wallet only supports nip04.
    return "nip04";
}
/** Checks if the wallet service supports a specific method */
export function supportsMethod(info, method) {
    const walletInfo = isEvent(info) ? getWalletSupport(info) : info;
    return walletInfo?.methods.includes(method) ?? false;
}
/** Checks if the wallet service supports notifications */
export function supportsNotifications(info) {
    const walletInfo = isEvent(info) ? getWalletSupport(info) : info;
    return (walletInfo?.notifications?.length ?? 0) > 0;
}
/** Checks if the wallet service supports a specific notification type */
export function supportsNotificationType(info, notificationType) {
    const walletInfo = isEvent(info) ? getWalletSupport(info) : info;
    return walletInfo?.notifications?.includes(notificationType) ?? false;
}
/** Gets all supported methods from the wallet info */
export function getSupportedMethods(info) {
    const walletInfo = isEvent(info) ? getWalletSupport(info) : info;
    return walletInfo?.methods ?? [];
}
/** Gets all supported notifications from the wallet info */
export function getSupportedNotifications(info) {
    const walletInfo = isEvent(info) ? getWalletSupport(info) : info;
    return walletInfo?.notifications ?? [];
}