/*
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Copyright (C) 2022-2023 ImmortalWrt.org
 */

'use strict';
'require baseclass';
'require form';
'require fs';
'require rpc';
'require uci';
'require ui';

return baseclass.extend({
	dns_strategy: {
		'': _('Default'),
		'prefer_ipv4': _('Prefer IPv4'),
		'prefer_ipv6': _('Prefer IPv6'),
		'ipv4_only': _('IPv4 only'),
		'ipv6_only': _('IPv6 only')
	},

	shadowsocks_encrypt_methods: [
		/* Stream */
		'none',
		/* AEAD */
		'aes-128-gcm',
		'aes-192-gcm',
		'aes-256-gcm',
		'chacha20-ietf-poly1305',
		'xchacha20-ietf-poly1305',
		/* AEAD 2022 */
		'2022-blake3-aes-128-gcm',
		'2022-blake3-aes-256-gcm',
		'2022-blake3-chacha20-poly1305'
	],

	tls_cipher_suites: [
		'TLS_RSA_WITH_AES_128_CBC_SHA',
		'TLS_RSA_WITH_AES_256_CBC_SHA',
		'TLS_RSA_WITH_AES_128_GCM_SHA256',
		'TLS_RSA_WITH_AES_256_GCM_SHA384',
		'TLS_AES_128_GCM_SHA256',
		'TLS_AES_256_GCM_SHA384',
		'TLS_CHACHA20_POLY1305_SHA256',
		'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA',
		'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA',
		'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA',
		'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA',
		'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256',
		'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384',
		'TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256',
		'TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384',
		'TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256',
		'TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256'
	],

	tls_versions: [
		'1.0',
		'1.1',
		'1.2',
		'1.3'
	],

	calcStringMD5: function(e) {
		/* Thanks to https://stackoverflow.com/a/41602636 */
		function h(a, b) {
			var c, d, e, f, g;
			e = a & 2147483648;
			f = b & 2147483648;
			c = a & 1073741824;
			d = b & 1073741824;
			g = (a & 1073741823) + (b & 1073741823);
			return c & d ? g ^ 2147483648 ^ e ^ f : c | d ? g & 1073741824 ? g ^ 3221225472 ^ e ^ f : g ^ 1073741824 ^ e ^ f : g ^ e ^ f;
		}
		function k(a, b, c, d, e, f, g) { a = h(a, h(h(b & c | ~b & d, e), g)); return h(a << f | a >>> 32 - f, b); }
		function l(a, b, c, d, e, f, g) { a = h(a, h(h(b & d | c & ~d, e), g)); return h(a << f | a >>> 32 - f, b); }
		function m(a, b, d, c, e, f, g) { a = h(a, h(h(b ^ d ^ c, e), g)); return h(a << f | a >>> 32 - f, b); }
		function n(a, b, d, c, e, f, g) { a = h(a, h(h(d ^ (b | ~c), e), g)); return h(a << f | a >>> 32 - f, b); }
		function p(a) {
			var b = '', d = '';
			for (var c = 0; 3 >= c; c++) d = a >>> 8 * c & 255, d = '0' + d.toString(16), b += d.substr(d.length - 2, 2);
			return b;
		}

		var f = [], q, r, s, t, a, b, c, d;
		e = function(a) {
			a = a.replace(/\r\n/g, '\n');
			for (var b = '', d = 0; d < a.length; d++) {
				var c = a.charCodeAt(d);
				128 > c ? b += String.fromCharCode(c) : (127 < c && 2048 > c ? b += String.fromCharCode(c >> 6 | 192) :
					(b += String.fromCharCode(c >> 12 | 224), b += String.fromCharCode(c >> 6 & 63 | 128)),
						b += String.fromCharCode(c & 63 | 128))
			}
			return b;
		}(e);
		f = function(b) {
			var c = b.length, a = c + 8;
			for (var d = 16 * ((a - a % 64) / 64 + 1), e = Array(d - 1), f = 0, g = 0; g < c;)
				a = (g - g % 4) / 4, f = g % 4 * 8, e[a] |= b.charCodeAt(g) << f, g++;
			a = (g - g % 4) / 4; e[a] |= 128 << g % 4 * 8; e[d - 2] = c << 3; e[d - 1] = c >>> 29;
			return e;
		}(e);
		a = 1732584193;
		b = 4023233417;
		c = 2562383102;
		d = 271733878;

		for (e = 0; e < f.length; e += 16) q = a, r = b, s = c, t = d,
			a = k(a, b, c, d, f[e +  0],  7, 3614090360), d = k(d, a, b, c, f[e +  1], 12, 3905402710),
			c = k(c, d, a, b, f[e +  2], 17,  606105819), b = k(b, c, d, a, f[e +  3], 22, 3250441966),
			a = k(a, b, c, d, f[e +  4], 7,  4118548399), d = k(d, a, b, c, f[e +  5], 12, 1200080426),
			c = k(c, d, a, b, f[e +  6], 17, 2821735955), b = k(b, c, d, a, f[e +  7], 22, 4249261313),
			a = k(a, b, c, d, f[e +  8],  7, 1770035416), d = k(d, a, b, c, f[e +  9], 12, 2336552879),
			c = k(c, d, a, b, f[e + 10], 17, 4294925233), b = k(b, c, d, a, f[e + 11], 22, 2304563134),
			a = k(a, b, c, d, f[e + 12],  7, 1804603682), d = k(d, a, b, c, f[e + 13], 12, 4254626195),
			c = k(c, d, a, b, f[e + 14], 17, 2792965006), b = k(b, c, d, a, f[e + 15], 22, 1236535329),
			a = l(a, b, c, d, f[e +  1],  5, 4129170786), d = l(d, a, b, c, f[e +  6],  9, 3225465664),
			c = l(c, d, a, b, f[e + 11], 14,  643717713), b = l(b, c, d, a, f[e +  0], 20, 3921069994),
			a = l(a, b, c, d, f[e +  5],  5, 3593408605), d = l(d, a, b, c, f[e + 10],  9,   38016083),
			c = l(c, d, a, b, f[e + 15], 14, 3634488961), b = l(b, c, d, a, f[e +  4], 20, 3889429448),
			a = l(a, b, c, d, f[e +  9],  5,  568446438), d = l(d, a, b, c, f[e + 14],  9, 3275163606),
			c = l(c, d, a, b, f[e +  3], 14, 4107603335), b = l(b, c, d, a, f[e +  8], 20, 1163531501),
			a = l(a, b, c, d, f[e + 13],  5, 2850285829), d = l(d, a, b, c, f[e +  2],  9, 4243563512),
			c = l(c, d, a, b, f[e +  7], 14, 1735328473), b = l(b, c, d, a, f[e + 12], 20, 2368359562),
			a = m(a, b, c, d, f[e +  5],  4, 4294588738), d = m(d, a, b, c, f[e +  8], 11, 2272392833),
			c = m(c, d, a, b, f[e + 11], 16, 1839030562), b = m(b, c, d, a, f[e + 14], 23, 4259657740),
			a = m(a, b, c, d, f[e +  1],  4, 2763975236), d = m(d, a, b, c, f[e +  4], 11, 1272893353),
			c = m(c, d, a, b, f[e +  7], 16, 4139469664), b = m(b, c, d, a, f[e + 10], 23, 3200236656),
			a = m(a, b, c, d, f[e + 13],  4,  681279174), d = m(d, a, b, c, f[e +  0], 11, 3936430074),
			c = m(c, d, a, b, f[e +  3], 16, 3572445317), b = m(b, c, d, a, f[e +  6], 23,   76029189),
			a = m(a, b, c, d, f[e +  9],  4, 3654602809), d = m(d, a, b, c, f[e + 12], 11, 3873151461),
			c = m(c, d, a, b, f[e + 15], 16,  530742520), b = m(b, c, d, a, f[e +  2], 23, 3299628645),
			a = n(a, b, c, d, f[e +  0],  6, 4096336452), d = n(d, a, b, c, f[e +  7], 10, 1126891415),
			c = n(c, d, a, b, f[e + 14], 15, 2878612391), b = n(b, c, d, a, f[e +  5], 21, 4237533241),
			a = n(a, b, c, d, f[e + 12],  6, 1700485571), d = n(d, a, b, c, f[e +  3], 10, 2399980690),
			c = n(c, d, a, b, f[e + 10], 15, 4293915773), b = n(b, c, d, a, f[e +  1], 21, 2240044497),
			a = n(a, b, c, d, f[e +  8],  6, 1873313359), d = n(d, a, b, c, f[e + 15], 10, 4264355552),
			c = n(c, d, a, b, f[e +  6], 15, 2734768916), b = n(b, c, d, a, f[e + 13], 21, 1309151649),
			a = n(a, b, c, d, f[e +  4],  6, 4149444226), d = n(d, a, b, c, f[e + 11], 10, 3174756917),
			c = n(c, d, a, b, f[e +  2], 15,  718787259), b = n(b, c, d, a, f[e +  9], 21, 3951481745),
			a = h(a, q), b = h(b, r), c = h(c, s), d = h(d, t);
		return (p(a) + p(b) + p(c) + p(d)).toLowerCase();
	},

	decodeBase64Str: function(str) {
		if (!str)
			return null;

		/* Thanks to luci-app-ssr-plus */
		str = str.replace(/-/g, '+').replace(/_/g, '/');
		var padding = (4 - str.length % 4) % 4;
		if (padding)
			str = str + Array(padding + 1).join('=');

		return decodeURIComponent(Array.prototype.map.call(atob(str), (c) =>
			'%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
		).join(''));
	},

	getBuiltinFeatures: function() {
		var callGetSingBoxFeatures = rpc.declare({
			object: 'luci.homeproxy',
			method: 'singbox_get_features',
			expect: { '': {} }
		});

		return L.resolveDefault(callGetSingBoxFeatures(), {});
	},

	generateUUIDv4: function() {
		/* Thanks to https://stackoverflow.com/a/2117523 */
		return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, (c) =>
			(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
		);
	},

	loadDefaultLabel: function(uciconfig, ucisection) {
		var label = uci.get(uciconfig, ucisection, 'label');
		if (label) {
			return label;
		} else {
			uci.set(uciconfig, ucisection, 'label', ucisection);
			return ucisection;
		}
	},

	loadModalTitle: function(title, addtitle, uciconfig, ucisection) {
		var label = uci.get(uciconfig, ucisection, 'label');
		return label ? title + ' » ' + label : addtitle;
	},

	renderSectionAdd: function(section, extra_class) {
		var el = form.GridSection.prototype.renderSectionAdd.apply(section, [ extra_class ]),
			nameEl = el.querySelector('.cbi-section-create-name');
		ui.addValidator(nameEl, 'uciname', true, (v) => {
			var button = el.querySelector('.cbi-section-create > .cbi-button-add');
			var uciconfig = section.uciconfig || section.map.config;

			if (!v) {
				button.disabled = true;
				return true;
			} else if (uci.get(uciconfig, v)) {
				button.disabled = true;
				return _('Expecting: %s').format(_('unique UCI identifier'));
			} else {
				button.disabled = null;
				return true;
			}
		}, 'blur', 'keyup');

		return el;
	},

	uploadCertificate: function(option, type, filename, ev) {
		var callWriteCertificate = rpc.declare({
			object: 'luci.homeproxy',
			method: 'certificate_write',
			params: ['filename'],
			expect: { '': {} }
		});

		return ui.uploadFile('/tmp/homeproxy_certificate.tmp', ev.target)
		.then(L.bind((btn, res) => {
			return L.resolveDefault(callWriteCertificate(filename), {}).then((ret) => {
				if (ret.result === true)
					ui.addNotification(null, E('p', _('Your %s was successfully uploaded. Size: %sB.').format(type, res.size)));
				else
					ui.addNotification(null, E('p', _('Failed to upload %s, error: %s.').format(type, ret.error)));
			});
		}, this, ev.target))
		.catch((e) => { ui.addNotification(null, E('p', e.message)) });
	},

	validateBase64Key: function(length, section_id, value) {
		/* Thanks to luci-proto-wireguard */
		if (section_id && value)
			if (value.length !== length || !value.match(/^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/) || value[length-1] !== '=')
				return _('Expecting: %s').format(_('valid base64 key with %d characters').format(length));

		return true;
	},

	validateUniqueValue: function(uciconfig, ucisection, ucioption, section_id, value) {
		if (section_id) {
			if (!value)
				return _('Expecting: %s').format(_('non-empty value'));

			var duplicate = false;
			uci.sections(uciconfig, ucisection, (res) => {
				if (res['.name'] !== section_id)
					if (res[ucioption] === value)
						duplicate = true
			});
			if (duplicate)
				return _('Expecting: %s').format(_('unique value'));
		}

		return true;
	},

	validateUUID: function(section_id, value) {
		if (section_id) {
			if (!value)
				return _('Expecting: %s').format(_('non-empty value'));
			else if (value.match('^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$') === null)
				return _('Expecting: %s').format(_('valid uuid'));
		}

		return true;
	}
});
