signal.js

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.getNextPreKeysNode = exports.getNextPreKeys = exports.extractDeviceJids = exports.parseAndInjectE2ESessions = exports.encryptSenderKeyMsgSignalProto = exports.encryptSignalProto = exports.decryptSignalProto = exports.processSenderKeyMessage = exports.decryptGroupSignalProto = exports.signalStorage = exports.xmppPreKey = exports.xmppSignedPreKey = exports.generateOrGetPreKeys = exports.getPreKeys = exports.createSignalIdentity = exports.jidToSignalSenderKeyName = exports.jidToSignalProtocolAddress = void 0;
const libsignal = __importStar(require("libsignal"));
const WASignalGroup_1 = require("../../WASignalGroup");
const Defaults_1 = require("../Defaults");
const WABinary_1 = require("../WABinary");
const crypto_1 = require("./crypto");
const generics_1 = require("./generics");
const jidToSignalAddress = (jid) => jid.split('@')[0];
const jidToSignalProtocolAddress = (jid) => {
    return new libsignal.ProtocolAddress(jidToSignalAddress(jid), 0);
};
exports.jidToSignalProtocolAddress = jidToSignalProtocolAddress;
const jidToSignalSenderKeyName = (group, user) => {
    return new WASignalGroup_1.SenderKeyName(group, (0, exports.jidToSignalProtocolAddress)(user)).toString();
};
exports.jidToSignalSenderKeyName = jidToSignalSenderKeyName;
const createSignalIdentity = (wid, accountSignatureKey) => {
    return {
        identifier: { name: wid, deviceId: 0 },
        identifierKey: (0, crypto_1.generateSignalPubKey)(accountSignatureKey)
    };
};
exports.createSignalIdentity = createSignalIdentity;
const getPreKeys = async ({ get }, min, limit) => {
    const idList = [];
    for (let id = min; id < limit; id++) {
        idList.push(id.toString());
    }
    return get('pre-key', idList);
};
exports.getPreKeys = getPreKeys;
const generateOrGetPreKeys = (creds, range) => {
    const avaliable = creds.nextPreKeyId - creds.firstUnuploadedPreKeyId;
    const remaining = range - avaliable;
    const lastPreKeyId = creds.nextPreKeyId + remaining - 1;
    const newPreKeys = {};
    if (remaining > 0) {
        for (let i = creds.nextPreKeyId; i <= lastPreKeyId; i++) {
            newPreKeys[i] = crypto_1.Curve.generateKeyPair();
        }
    }
    return {
        newPreKeys,
        lastPreKeyId,
        preKeysRange: [creds.firstUnuploadedPreKeyId, range],
    };
};
exports.generateOrGetPreKeys = generateOrGetPreKeys;
const xmppSignedPreKey = (key) => ({
    tag: 'skey',
    attrs: {},
    content: [
        { tag: 'id', attrs: {}, content: (0, generics_1.encodeBigEndian)(key.keyId, 3) },
        { tag: 'value', attrs: {}, content: key.keyPair.public },
        { tag: 'signature', attrs: {}, content: key.signature }
    ]
});
exports.xmppSignedPreKey = xmppSignedPreKey;
const xmppPreKey = (pair, id) => ({
    tag: 'key',
    attrs: {},
    content: [
        { tag: 'id', attrs: {}, content: (0, generics_1.encodeBigEndian)(id, 3) },
        { tag: 'value', attrs: {}, content: pair.public }
    ]
});
exports.xmppPreKey = xmppPreKey;
const signalStorage = ({ creds, keys }) => ({
    loadSession: async (id) => {
        const { [id]: sess } = await keys.get('session', [id]);
        if (sess) {
            return libsignal.SessionRecord.deserialize(sess);
        }
    },
    storeSession: async (id, session) => {
        await keys.set({ 'session': { [id]: session.serialize() } });
    },
    isTrustedIdentity: () => {
        return true;
    },
    loadPreKey: async (id) => {
        const keyId = id.toString();
        const { [keyId]: key } = await keys.get('pre-key', [keyId]);
        if (key) {
            return {
                privKey: Buffer.from(key.private),
                pubKey: Buffer.from(key.public)
            };
        }
    },
    removePreKey: (id) => keys.set({ 'pre-key': { [id]: null } }),
    loadSignedPreKey: () => {
        const key = creds.signedPreKey;
        return {
            privKey: Buffer.from(key.keyPair.private),
            pubKey: Buffer.from(key.keyPair.public)
        };
    },
    loadSenderKey: async (keyId) => {
        const { [keyId]: key } = await keys.get('sender-key', [keyId]);
        if (key) {
            return new WASignalGroup_1.SenderKeyRecord(key);
        }
    },
    storeSenderKey: async (keyId, key) => {
        await keys.set({ 'sender-key': { [keyId]: key.serialize() } });
    },
    getOurRegistrationId: () => (creds.registrationId),
    getOurIdentity: () => {
        const { signedIdentityKey } = creds;
        return {
            privKey: Buffer.from(signedIdentityKey.private),
            pubKey: (0, crypto_1.generateSignalPubKey)(signedIdentityKey.public),
        };
    }
});
exports.signalStorage = signalStorage;
const decryptGroupSignalProto = (group, user, msg, auth) => {
    const senderName = (0, exports.jidToSignalSenderKeyName)(group, user);
    const cipher = new WASignalGroup_1.GroupCipher((0, exports.signalStorage)(auth), senderName);
    return cipher.decrypt(Buffer.from(msg));
};
exports.decryptGroupSignalProto = decryptGroupSignalProto;
const processSenderKeyMessage = async (authorJid, item, auth) => {
    const builder = new WASignalGroup_1.GroupSessionBuilder((0, exports.signalStorage)(auth));
    const senderName = (0, exports.jidToSignalSenderKeyName)(item.groupId, authorJid);
    const senderMsg = new WASignalGroup_1.SenderKeyDistributionMessage(null, null, null, null, item.axolotlSenderKeyDistributionMessage);
    const { [senderName]: senderKey } = await auth.keys.get('sender-key', [senderName]);
    if (!senderKey) {
        const record = new WASignalGroup_1.SenderKeyRecord();
        await auth.keys.set({ 'sender-key': { [senderName]: record } });
    }
    await builder.process(senderName, senderMsg);
};
exports.processSenderKeyMessage = processSenderKeyMessage;
const decryptSignalProto = async (user, type, msg, auth) => {
    const addr = (0, exports.jidToSignalProtocolAddress)(user);
    const session = new libsignal.SessionCipher((0, exports.signalStorage)(auth), addr);
    let result;
    switch (type) {
        case 'pkmsg':
            result = await session.decryptPreKeyWhisperMessage(msg);
            break;
        case 'msg':
            result = await session.decryptWhisperMessage(msg);
            break;
    }
    return result;
};
exports.decryptSignalProto = decryptSignalProto;
const encryptSignalProto = async (user, buffer, auth) => {
    const addr = (0, exports.jidToSignalProtocolAddress)(user);
    const cipher = new libsignal.SessionCipher((0, exports.signalStorage)(auth), addr);
    const { type: sigType, body } = await cipher.encrypt(buffer);
    const type = sigType === 3 ? 'pkmsg' : 'msg';
    return { type, ciphertext: Buffer.from(body, 'binary') };
};
exports.encryptSignalProto = encryptSignalProto;
const encryptSenderKeyMsgSignalProto = async (group, data, meId, auth) => {
    const storage = (0, exports.signalStorage)(auth);
    const senderName = (0, exports.jidToSignalSenderKeyName)(group, meId);
    const builder = new WASignalGroup_1.GroupSessionBuilder(storage);
    const { [senderName]: senderKey } = await auth.keys.get('sender-key', [senderName]);
    if (!senderKey) {
        const record = new WASignalGroup_1.SenderKeyRecord();
        await auth.keys.set({ 'sender-key': { [senderName]: record } });
    }
    const senderKeyDistributionMessage = await builder.create(senderName);
    const session = new WASignalGroup_1.GroupCipher(storage, senderName);
    return {
        ciphertext: await session.encrypt(data),
        senderKeyDistributionMessageKey: senderKeyDistributionMessage.serialize(),
    };
};
exports.encryptSenderKeyMsgSignalProto = encryptSenderKeyMsgSignalProto;
const parseAndInjectE2ESessions = async (node, auth) => {
    const extractKey = (key) => (key ? ({
        keyId: (0, WABinary_1.getBinaryNodeChildUInt)(key, 'id', 3),
        publicKey: (0, crypto_1.generateSignalPubKey)((0, WABinary_1.getBinaryNodeChildBuffer)(key, 'value')),
        signature: (0, WABinary_1.getBinaryNodeChildBuffer)(key, 'signature'),
    }) : undefined);
    const nodes = (0, WABinary_1.getBinaryNodeChildren)((0, WABinary_1.getBinaryNodeChild)(node, 'list'), 'user');
    for (const node of nodes) {
        (0, WABinary_1.assertNodeErrorFree)(node);
    }
    await Promise.all(nodes.map(async (node) => {
        const signedKey = (0, WABinary_1.getBinaryNodeChild)(node, 'skey');
        const key = (0, WABinary_1.getBinaryNodeChild)(node, 'key');
        const identity = (0, WABinary_1.getBinaryNodeChildBuffer)(node, 'identity');
        const jid = node.attrs.jid;
        const registrationId = (0, WABinary_1.getBinaryNodeChildUInt)(node, 'registration', 4);
        const device = {
            registrationId,
            identityKey: (0, crypto_1.generateSignalPubKey)(identity),
            signedPreKey: extractKey(signedKey),
            preKey: extractKey(key)
        };
        const cipher = new libsignal.SessionBuilder((0, exports.signalStorage)(auth), (0, exports.jidToSignalProtocolAddress)(jid));
        await cipher.initOutgoing(device);
    }));
};
exports.parseAndInjectE2ESessions = parseAndInjectE2ESessions;
const extractDeviceJids = (result, myJid, excludeZeroDevices) => {
    var _a;
    const { user: myUser, device: myDevice } = (0, WABinary_1.jidDecode)(myJid);
    const extracted = [];
    for (const node of result.content) {
        const list = (_a = (0, WABinary_1.getBinaryNodeChild)(node, 'list')) === null || _a === void 0 ? void 0 : _a.content;
        if (list && Array.isArray(list)) {
            for (const item of list) {
                const { user } = (0, WABinary_1.jidDecode)(item.attrs.jid);
                const devicesNode = (0, WABinary_1.getBinaryNodeChild)(item, 'devices');
                const deviceListNode = (0, WABinary_1.getBinaryNodeChild)(devicesNode, 'device-list');
                if (Array.isArray(deviceListNode === null || deviceListNode === void 0 ? void 0 : deviceListNode.content)) {
                    for (const { tag, attrs } of deviceListNode.content) {
                        const device = +attrs.id;
                        if (tag === 'device' && // ensure the "device" tag
                            (!excludeZeroDevices || device !== 0) && // if zero devices are not-excluded, or device is non zero
                            (myUser !== user || myDevice !== device) && // either different user or if me user, not this device
                            (device === 0 || !!attrs['key-index']) // ensure that "key-index" is specified for "non-zero" devices, produces a bad req otherwise
                        ) {
                            extracted.push({ user, device });
                        }
                    }
                }
            }
        }
    }
    return extracted;
};
exports.extractDeviceJids = extractDeviceJids;
/**
 * get the next N keys for upload or processing
 * @param count number of pre-keys to get or generate
 */
const getNextPreKeys = async ({ creds, keys }, count) => {
    const { newPreKeys, lastPreKeyId, preKeysRange } = (0, exports.generateOrGetPreKeys)(creds, count);
    const update = {
        nextPreKeyId: Math.max(lastPreKeyId + 1, creds.nextPreKeyId),
        firstUnuploadedPreKeyId: Math.max(creds.firstUnuploadedPreKeyId, lastPreKeyId + 1)
    };
    await keys.set({ 'pre-key': newPreKeys });
    const preKeys = await (0, exports.getPreKeys)(keys, preKeysRange[0], preKeysRange[0] + preKeysRange[1]);
    return { update, preKeys };
};
exports.getNextPreKeys = getNextPreKeys;
const getNextPreKeysNode = async (state, count) => {
    const { creds } = state;
    const { update, preKeys } = await (0, exports.getNextPreKeys)(state, count);
    const node = {
        tag: 'iq',
        attrs: {
            xmlns: 'encrypt',
            type: 'set',
            to: WABinary_1.S_WHATSAPP_NET,
        },
        content: [
            { tag: 'registration', attrs: {}, content: (0, generics_1.encodeBigEndian)(creds.registrationId) },
            { tag: 'type', attrs: {}, content: Defaults_1.KEY_BUNDLE_TYPE },
            { tag: 'identity', attrs: {}, content: creds.signedIdentityKey.public },
            { tag: 'list', attrs: {}, content: Object.keys(preKeys).map(k => (0, exports.xmppPreKey)(preKeys[+k], +k)) },
            (0, exports.xmppSignedPreKey)(creds.signedPreKey)
        ]
    };
    return { update, node };
};
exports.getNextPreKeysNode = getNextPreKeysNode;