stackexchange-dnscontrol/pkg/js/helpers.js

'use strict';

// How to keep this file clean:
// 1. Add new functions in alphabetical order when it makes sense.
// 2. Run [prettier](https://github.com/prettier/prettier) on the file to ensure
//    your code conforms to our coding standard:
//        npm install prettier
//        node_modules/.bin/prettier --write pkg/js/helpers.js

// Development tip:
// This file is embeded in the binary via "go build". If you are
// debugging/developing this code, it may be faster to specify the
// -dev file to have helpers.js read from the file instead.

var conf = {
    registrars: [],
    dns_providers: [],
    domains: [],
    domain_names: [],
};

var defaultArgs = [];

function initialize() {
    conf = {
        registrars: [],
        dns_providers: [],
        domains: [],
    };
    defaultArgs = [];
}

function _isDomain(d) {
    return (
        _.isArray(d.nameservers) && _.isArray(d.records) && _.isString(d.name)
    );
}

// Returns an array of domains which were registered so far during runtime
// Own function for compatibility reasons or if some day special processing would be required.
function getConfiguredDomains() {
    return conf.domain_names;
}

// NewRegistrar returns an registrar object.
// For backwards compatibility, it accepts (name), (name, meta),
// (name, type), (name, type, meta).
function NewRegistrar() {
    // For backwards compatibility, this is a wrapper around the legacy
    // version of this function.
    switch (arguments.length) {
        case 1:
            return oldNewRegistrar(arguments[0], '-');
        case 2:
            // x = NewRegistrar("myThing", "THING")
            // x = NewRegistrar("myThing", { metakey: metavalue } )
            if (typeof arguments[1] === 'object') {
                return oldNewRegistrar(arguments[0], '-', arguments[1]);
            }
            break;
        default: // do nothing
    }
    return oldNewRegistrar.apply(null, arguments);
}
function oldNewRegistrar(name, type, meta) {
    if (type) {
        type == 'MANUAL';
    }
    var reg = { name: name, type: type, meta: meta };
    conf.registrars.push(reg);
    return name;
}

function NewDnsProvider(name, type, meta) {
    // For backwards compatibility, this is a wrapper around the legacy
    // version of this function.
    switch (arguments.length) {
        case 1:
            return oldNewDnsProvider(arguments[0], '-');
        case 2:
            // x = NewDnsProvider("myThing", "THING")
            // x = NewDnsProvider("myThing", { metakey: metavalue } )
            if (typeof arguments[1] === 'object') {
                return oldNewDnsProvider(arguments[0], '-', arguments[1]);
            }
            break;
        default: // do nothing
    }
    return oldNewDnsProvider.apply(null, arguments);
}
function oldNewDnsProvider(name, type, meta) {
    if (typeof meta === 'object' && 'ip_conversions' in meta) {
        meta.ip_conversions = format_tt(meta.ip_conversions);
    }
    var dsp = { name: name, type: type, meta: meta };
    conf.dns_providers.push(dsp);
    return name;
}

function newDomain(name, registrar) {
    return {
        name: name,
        subdomain: '',
        registrar: registrar,
        meta: {},
        records: [],
        recordsabsent: [],
        dnsProviders: {},
        defaultTTL: 0,
        nameservers: [],
        ignored_names: [],
        ignored_targets: [],
        unmanaged: [],
    };
}

function processDargs(m, domain) {
    // for each modifier, if it is a...
    // function: call it with domain
    // array: process recursively
    // object: merge it into metadata
    if (_.isFunction(m)) {
        m(domain);
    } else if (_.isArray(m)) {
        for (var j in m) {
            processDargs(m[j], domain);
        }
    } else if (_.isObject(m)) {
        _.extend(domain.meta, m);
    } else {
        throw (
            'WARNING: domain modifier type unsupported: ' +
            typeof m +
            ' Domain: ' +
            domain.name
        );
    }
}

// D(name,registrar): Create a DNS Domain. Use the parameters as records and mods.
function D(name, registrar) {
    var domain = newDomain(name, registrar);
    for (var i = 0; i < defaultArgs.length; i++) {
        processDargs(defaultArgs[i], domain);
    }
    for (var i = 2; i < arguments.length; i++) {
        var m = arguments[i];
        processDargs(m, domain);
    }
    if (conf.domain_names.indexOf(name) !== -1) {
        throw name + ' is declared more than once';
    }
    conf.domains.push(domain);
    conf.domain_names.push(name);
}

function INCLUDE(name) {
    var domain = _getDomainObject(name);
    if (domain == null) {
        throw (
            name +
            ' was not declared yet and therefore cannot be updated. Use D() before.'
        );
    }
    return function (d) {
        d.records.push.apply(d.records, domain.obj.records);
    };
}

// D_EXTEND(name): Update a DNS Domain already added with D(), or subdomain thereof
function D_EXTEND(name) {
    var domain = _getDomainObject(name);
    if (domain == null) {
        throw (
            name +
            ' was not declared yet and therefore cannot be updated. Use D() before.'
        );
    }
    domain.obj.subdomain = name.substr(
        0,
        name.length - domain.obj.name.length - 1
    );
    for (var i = 1; i < arguments.length; i++) {
        var m = arguments[i];
        processDargs(m, domain.obj);
    }
    conf.domains[domain.id] = domain.obj; // let's overwrite the object.
}

// _getDomainObject(name): This implements the domain matching
// algorithm used by D_EXTEND(). Candidate matches are an exact match
// of the domain's name, or if name is a proper subdomain of the
// domain's name. The longest match is returned.
function _getDomainObject(name) {
    var domain = null;
    var domainLen = 0;
    for (var i = 0; i < conf.domains.length; i++) {
        var thisName = conf.domains[i]['name'];
        var desiredSuffix = '.' + thisName;
        var foundSuffix = name.substr(-desiredSuffix.length);
        // If this is an exact match or the suffix matches...
        if (name === thisName || foundSuffix === desiredSuffix) {
            // If this match is a longer match than our current best match...
            if (thisName.length > domainLen) {
                domainLen = thisName.length;
                domain = { id: i, obj: conf.domains[i] };
            }
        }
    }
    return domain;
}

// DEFAULTS provides a set of default arguments to apply to all future domains.
// Each call to DEFAULTS will clear any previous values set.
function DEFAULTS() {
    defaultArgs = [];
    for (var i = 0; i < arguments.length; i++) {
        defaultArgs.push(arguments[i]);
    }
}

// TTL(v): Set the TTL for a DNS record.
function TTL(v) {
    if (_.isString(v)) {
        v = stringToDuration(v);
    }
    return function (r) {
        r.ttl = v;
    };
}

function stringToDuration(v) {
    var matches = v.match(/^(\d+)([smhdwny]?)$/);
    if (matches == null) {
        throw v + ' is not a valid duration string';
    }
    unit = 's';
    if (matches[2]) {
        unit = matches[2];
    }
    v = parseInt(matches[1]);
    var u = { s: 1, m: 60, h: 3600 };
    u['d'] = u.h * 24;
    u['w'] = u.d * 7;
    u['n'] = u.d * 30;
    u['y'] = u.d * 365;
    v *= u[unit];
    return v;
}

// DefaultTTL(v): Set the default TTL for the domain.
function DefaultTTL(v) {
    if (_.isString(v)) {
        v = stringToDuration(v);
    }
    return function (d) {
        d.defaultTTL = v;
    };
}

function makeCAAFlag(value) {
    return function (record) {
        record.caaflag |= value;
    };
}

// CAA_CRITICAL: Critical CAA flag
var CAA_CRITICAL = makeCAAFlag(1 << 7);

// DnsProvider("providerName", 0)
// nsCount of 0 means don't use or register any nameservers.
// nsCount not provider means use all.
function DnsProvider(name, nsCount) {
    if (typeof nsCount === 'undefined') {
        nsCount = -1;
    }
    return function (d) {
        d.dnsProviders[name] = nsCount;
    };
}

// A(name,ip, recordModifiers...)
var A = recordBuilder('A');

// AAAA(name,ip, recordModifiers...)
var AAAA = recordBuilder('AAAA');

// AKAMAICDN(name, target, recordModifiers...)
var AKAMAICDN = recordBuilder('AKAMAICDN');

// ALIAS(name,target, recordModifiers...)
var ALIAS = recordBuilder('ALIAS');

// AZURE_ALIAS(name, type, target, recordModifiers...)
var AZURE_ALIAS = recordBuilder('AZURE_ALIAS', {
    args: [
        ['name', _.isString],
        ['type', validateAzureAliasType],
        ['target', _.isString],
    ],
    transform: function (record, args, modifier) {
        record.name = args.name;
        record.target = args.target;
        if (_.isObject(record.azure_alias)) {
            record.azure_alias['type'] = args.type;
        } else {
            record.azure_alias = { type: args.type };
        }
    },
});

function validateAzureAliasType(value) {
    if (!_.isString(value)) {
        return false;
    }
    return ['A', 'AAAA', 'CNAME'].indexOf(value) !== -1;
}

// R53_ALIAS(name, target, type, recordModifiers...)
var R53_ALIAS = recordBuilder('R53_ALIAS', {
    args: [
        ['name', _.isString],
        ['type', validateR53AliasType],
        ['target', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.target = args.target;
        if (_.isObject(record.r53_alias)) {
            record.r53_alias['type'] = args.type;
            if (!_.isString(record.r53_alias['evaluate_target_health'])) {
                record.r53_alias['evaluate_target_health'] = 'false';
            }
        } else {
            record.r53_alias = {
                type: args.type,
                evaluate_target_health: 'false',
            };
        }
    },
});

// R53_ZONE(zone_id)
function R53_ZONE(zone_id) {
    return function (r) {
        if (_isDomain(r)) {
            r.meta.zone_id = zone_id;
        } else if (_.isObject(r.r53_alias)) {
            r.r53_alias['zone_id'] = zone_id;
        } else {
            r.r53_alias = { zone_id: zone_id };
        }
    };
}

// R53_EVALUATE_TARGET_HEALTH(enabled)
function R53_EVALUATE_TARGET_HEALTH(enabled) {
    return function (r) {
        if (_.isObject(r.r53_alias)) {
            r.r53_alias['evaluate_target_health'] = enabled.toString();
        } else {
            r.r53_alias = { evaluate_target_health: enabled.toString() };
        }
    };
}

function validateR53AliasType(value) {
    if (!_.isString(value)) {
        return false;
    }
    return (
        [
            'A',
            'AAAA',
            'CNAME',
            'CAA',
            'MX',
            'TXT',
            'PTR',
            'SPF',
            'SRV',
            'NAPTR',
        ].indexOf(value) !== -1
    );
}

// CAA(name,tag,value, recordModifiers...)
var CAA = recordBuilder('CAA', {
    // TODO(tlim): It should be an error if value is not 0 or 128.
    args: [
        ['name', _.isString],
        ['tag', _.isString],
        ['value', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.caatag = args.tag;
        record.target = args.value;
    },
    modifierNumber: function (record, value) {
        record.caaflags |= value;
    },
});

// CNAME(name,target, recordModifiers...)
var CNAME = recordBuilder('CNAME');

// DS(name, keytag, algorithm, digestype, digest)
var DS = recordBuilder('DS', {
    args: [
        ['name', _.isString],
        ['keytag', _.isNumber],
        ['algorithm', _.isNumber],
        ['digesttype', _.isNumber],
        ['digest', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.dskeytag = args.keytag;
        record.dsalgorithm = args.algorithm;
        record.dsdigesttype = args.digesttype;
        record.dsdigest = args.digest;
        record.target = args.target;
    },
});

// DHCID(name,target, recordModifiers...)
var DHCID = recordBuilder('DHCID');

// DNAME(name,target, recordModifiers...)
var DNAME = recordBuilder('DNAME');

// DNSKEY(name, flags, protocol, algorithm, publickey)
var DNSKEY = recordBuilder('DNSKEY', {
    args: [
        ['name', _.isString],
        ['flags', _.isNumber],
        ['protocol', _.isNumber],
        ['algorithm', _.isNumber],
        ['publickey', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.dnskeyflags = args.flags;
        record.dnskeyprotocol = args.protocol;
        record.dnskeyalgorithm = args.algorithm;
        record.dnskeypublickey = args.publickey;
        record.target = args.target;
    },
});

// name, priority, target, params
var HTTPS = recordBuilder('HTTPS', {
    args: [
        ['name', _.isString],
        ['priority', _.isNumber],
        ['target', _.isString],
        ['params', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.svcpriority = args.priority;
        record.target = args.target;
        record.svcparams = args.params;
    },
});

// PTR(name,target, recordModifiers...)
var PTR = recordBuilder('PTR');

// NAPTR(name,order,preference,flags,service,regexp,target, recordModifiers...)
var NAPTR = recordBuilder('NAPTR', {
    args: [
        ['name', _.isString],
        ['order', _.isNumber],
        ['preference', _.isNumber],
        ['flags', _.isString],
        ['service', _.isString],
        ['regexp', _.isString],
        ['target', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.naptrorder = args.order;
        record.naptrpreference = args.preference;
        record.naptrflags = args.flags;
        record.naptrservice = args.service;
        record.naptrregexp = args.regexp;
        record.target = args.target;
    },
});

// SOA(name,ns,mbox,refresh,retry,expire,minimum, recordModifiers...)
var SOA = recordBuilder('SOA', {
    args: [
        ['name', _.isString],
        ['target', _.isString],
        ['mbox', _.isString],
        ['refresh', _.isNumber],
        ['retry', _.isNumber],
        ['expire', _.isNumber],
        ['minttl', _.isNumber],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.target = args.target;
        record.soambox = args.mbox;
        record.soarefresh = args.refresh;
        record.soaretry = args.retry;
        record.soaexpire = args.expire;
        record.soaminttl = args.minttl;
    },
});

// SRV(name,priority,weight,port,target, recordModifiers...)
var SRV = recordBuilder('SRV', {
    args: [
        ['name', _.isString],
        ['priority', _.isNumber],
        ['weight', _.isNumber],
        ['port', _.isNumber],
        ['target', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.srvpriority = args.priority;
        record.srvweight = args.weight;
        record.srvport = args.port;
        record.target = args.target;
    },
});

// SSHFP(name,algorithm,type,value, recordModifiers...)
var SSHFP = recordBuilder('SSHFP', {
    args: [
        ['name', _.isString],
        ['algorithm', _.isNumber],
        ['fingerprint', _.isNumber],
        ['value', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.sshfpalgorithm = args.algorithm;
        record.sshfpfingerprint = args.fingerprint;
        record.target = args.value;
    },
});

// name, priority, target, params
var SVCB = recordBuilder('SVCB', {
    args: [
        ['name', _.isString],
        ['priority', _.isNumber],
        ['target', _.isString],
        ['params', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.svcpriority = args.priority;
        record.target = args.target;
        record.svcparams = args.params;
    },
});

// name, usage, selector, matchingtype, certificate
var TLSA = recordBuilder('TLSA', {
    args: [
        ['name', _.isString],
        ['usage', _.isNumber],
        ['selector', _.isNumber],
        ['matchingtype', _.isNumber],
        ['target', _.isString], // recordBuilder needs a "target" argument
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.tlsausage = args.usage;
        record.tlsaselector = args.selector;
        record.tlsamatchingtype = args.matchingtype;
        record.target = args.target;
    },
});

function isStringOrArray(x) {
    return _.isString(x) || _.isArray(x);
}

// AUTOSPLIT is deprecated. It is now a no-op.
var AUTOSPLIT = {};

// TXT(name,target, recordModifiers...)
var TXT = recordBuilder('TXT', {
    args: [
        ['name', _.isString],
        ['target', isStringOrArray],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        // Store the strings from the user verbatim.
        if (_.isString(args.target)) {
            record.target = args.target;
        } else {
            record.target = args.target.join('');
        }
    },
});

// Parses coordinates of the form 41°24'12.2"N 2°10'26.5"E
function parseDMSCoordinatesString(inputString) {
    var lat = inputString.match(/(-?\d+).(\d+).([\d\.]+).?\ ?([NS])/);
    var lon = inputString.match(/(-?\d+).(\d+).([\d\.]+).?\ ?([EW])/);

    if (!lat || !lon) {
        return null;
    }

    return {
        lati: {
            dg: parseInt(lat[1]),
            mn: parseInt(lat[2]),
            sc: parseFloat(lat[3]),
            hemi: lat[4],
        },
        long: {
            dg: parseInt(lon[1]),
            mn: parseInt(lon[2]),
            sc: parseFloat(lon[3]),
            hemi: lon[4],
        },
    };
}

// // Parses coordinates of the form 25.24°S 153.15°E
function parseDMMCoordinatesString(inputString) {
    var lat = inputString.match(/(-?\d+(\.\d+)?)°?\s*([NS])/i);
    var lon = inputString.match(/(-?\d+(\.\d+)?)°?\s*([EW])/i);

    if (!lat || !lon) {
        return null;
    }

    var latDeg = Math.floor(parseFloat(lat[1]));
    var latMin = Math.floor((parseFloat(lat[1]) - latDeg) * 60);
    var latSec = Math.round(((parseFloat(lat[1]) - latDeg) * 60 - latMin) * 60);
    var lonDeg = Math.floor(parseFloat(lon[1]));
    var lonMin = Math.floor((parseFloat(lon[1]) - lonDeg) * 60);
    var lonSec = Math.round(((parseFloat(lon[1]) - lonDeg) * 60 - lonMin) * 60);

    var lati = {
        dg: latDeg,
        mn: latMin,
        sc: latSec,
        hemi: lat[3],
    };
    var long = {
        dg: lonDeg,
        mn: lonMin,
        sc: lonSec,
        hemi: lon[3],
    };

    return {
        lati: lati,
        long: long,
    };
}

// builds a uint8 with 4 bit mantissa, 4 bit exponent from a float.
function getENotationInt(x) {
    /*
       9000000000cm = 9e9 == 153 (9^4 + 9) or 9<<4 + 9
       800000000cm = 8e8 == 136 (8^4 + 8) or 8<<4 + 8
       70000000cm = 7e7 == 119 (7^4 + 7) or 7<<4 + 7
       6000000cm = 6e6 == 102 (6^4 + 6) or 6<<4 + 6
       1000000cm = 1e6 == 22 (1^4 + 6) or 1<<4 + 6
       500000cm = 5e5 == 85 (5^4 + 5) or 5<<4 + 5
       40000cm = 4e4 == 68 (4^4 + 4) or 4<<4 + 4
       3000cm = 3e3 == 51 (3^4 + 3) or 3<<4 + 3
       1000cm = 1e3 == 19 (1^4 + 3) or 1<<4 + 1
       200cm = 2e2 == 34 (2^4 + 2) or 2<<4 + 2
       10cm = 1e1 == 17 (1^4 + 1) or 1<<4 + 1
       1cm = 1e0 == 16 (1^4 + 0) or 0<<4 + 0
       0cm = 0e0 == 0
    */
    size = x * 100; // get cm value
    // get the m^e version of size
    array = size.toExponential(0).split('e+').map(Number);
    // convert it to 4bit:4bit uint8
    m_e = (array[0] << 4) | array[1];
    return m_e;
}

// Checks LOC parameters and if all is well, renders them into a 'target' string.
// The LOC record has no target string parameter. It only renders one via String().
function locStringBuilder(record, args) {
    record.name = args.name;

    // technically, we don't need this part to build the text target, but
    // it is a good sanity check to compare with later on down the chain
    // when you're in the weeds with maths.
    // Tests depend on it being present. Changes here must reflect in tests.
    nsstring = '';
    ewstring = '';
    precisionbuffer = '';
    ns = args.ns.toUpperCase();
    ew = args.ew.toUpperCase();

    // Handle N/S coords - can use also s1.toFixed(3)
    nsstring =
        args.d1.toString() +
        ' ' +
        args.m1.toString() +
        ' ' +
        args.s1.toString() +
        ' ';
    var nsmatches = args.ns.match(/^([NnSs])$/);
    if (nsmatches == null) {
        throw v + ' is not a valid latitude modifier';
    } else {
        nsstring += ns + ' ';
    }
    // Handle E/W coords - can use also s2.toFixed(3)
    ewstring =
        args.d2.toString() +
        ' ' +
        args.m2.toString() +
        ' ' +
        args.s2.toString() +
        ' ';
    var nsmatches = args.ew.match(/^([EeWw])$/);
    if (nsmatches == null) {
        throw v + ' is not a valid longitude modifier';
    } else {
        ewstring += ew + ' ';
    }

    // handle altitude, size, horizontal precision, vertical precision
    precisionbuffer = args.alt.toString() + 'm';
    precisionbuffer += ' ' + args.siz.toString() + 'm';
    precisionbuffer += ' ' + args.hp.toString() + 'm';
    precisionbuffer += ' ' + args.vp.toString() + 'm';

    record.target = nsstring + ewstring + precisionbuffer;

    return record;
}

// Renders LOC type internal properties from D˚M'S" parameters.
// Change anything here at your peril.
function locDMSBuilder(record, args) {
    LOCEquator = 1 << 31; // RFC 1876, Section 2.
    LOCPrimeMeridian = 1 << 31; // RFC 1876, Section 2.
    LOCHours = 60 * 1000;
    LOCDegrees = 60 * LOCHours;
    LOCAltitudeBase = 100000;

    lat = args.d1 * LOCDegrees + args.m1 * LOCHours + args.s1 * 1000;
    lon = args.d2 * LOCDegrees + args.m2 * LOCHours + args.s2 * 1000;
    if (ns == 'N') record.loclatitude = LOCEquator + lat;
    // S
    else record.loclatitude = LOCEquator - lat;
    if (ew == 'E') record.loclongitude = LOCPrimeMeridian + lon;
    // W
    else record.loclongitude = LOCPrimeMeridian - lon;
    // Altitude
    record.localtitude = (args.alt + LOCAltitudeBase) * 100;
    // Size
    record.locsize = getENotationInt(args.siz);
    // Horizontal Precision
    m_e = args.hp;
    record.lochorizpre = getENotationInt(args.hp);
    // if (m_e != 0) {
    // } else {
    //     record.lochorizpre = 22; // 10,000m default
    // }
    // Vertical Precision
    m_e = args.vp;
    record.locvertpre = getENotationInt(args.vp);
    // if (m_e != 0) {
    // } else {
    //     record.lochorizpre = 19; // 10m default
    // }
}

// LOC(name,d1,m1,s1,ns,d2,m2,s2,ew,alt,siz,hp,vp, recordModifiers...)
var LOC = recordBuilder('LOC', {
    args: [
        ['name', _.isString], //i.e. subdomain
        ['d1', _.isNumber], // N/S degrees
        ['m1', _.isNumber], // N/S minutes
        ['s1', _.isNumber], // N/S seconds
        ['ns', _.isString], // N/S
        ['d2', _.isNumber], // E/W degrees
        ['m2', _.isNumber], // E/W minutes
        ['s2', _.isNumber], // E/W seconds
        ['ew', _.isString], // E/W
        ['alt', _.isNumber], // altitude
        ['siz', _.isNumber], // size/precision
        ['hp', _.isNumber], // horizontal precision
        ['vp', _.isNumber], // vertical precision
    ],
    transform: function (record, args, modifiers) {
        record = locStringBuilder(record, args);
        record = locDMSBuilder(record, args);
    },
});

function ConvertDDToDMS(D, longitude) {
    //stackoverflow, baby. do not re-order the rows.
    return {
        hemi: D < 0 ? (longitude ? 'W' : 'S') : longitude ? 'E' : 'N',
        dg: 0 | (D < 0 ? (D = -D) : D),
        mn: 0 | (((D += 1e-9) % 1) * 60),
        sc: (0 | (((D * 60) % 1) * 60000)) / 1000,
    };
}

// MX(name,priority,target, recordModifiers...)
var MX = recordBuilder('MX', {
    args: [
        ['name', _.isString],
        ['priority', _.isNumber],
        ['target', _.isString],
    ],
    transform: function (record, args, modifiers) {
        record.name = args.name;
        record.mxpreference = args.priority;
        record.target = args.target;
    },
});

// NS(name,target, recordModifiers...)
var NS = recordBuilder('NS');

// NAMESERVER(name,target)
function NAMESERVER(name) {
    if (arguments.length != 1) {
        throw 'NAMESERVER only accepts one argument for name.';
    }
    return function (d) {
        d.nameservers.push({ name: name });
    };
}

// NAMESERVER_TTL(v): Set the TTL for NAMESERVER records.
function NAMESERVER_TTL(v) {
    if (_.isString(v)) {
        v = stringToDuration(v);
    }
    return { ns_ttl: v.toString() };
}

function format_tt(transform_table) {
    // Turn [[low: 1, high: 2, newBase: 3], [low: 4, high: 5, newIP: 6]]
    // into "1 ~ 2 ~ 3 ~; 4 ~ 5 ~  ~ 6"
    var lines = [];
    for (var i = 0; i < transform_table.length; i++) {
        var ip = transform_table[i];
        var newIP = ip.newIP;
        if (newIP) {
            if (_.isArray(newIP)) {
                newIP = _.map(newIP, function (i) {
                    return num2dot(i);
                }).join(',');
            } else {
                newIP = num2dot(newIP);
            }
        }
        var newBase = ip.newBase;
        if (newBase) {
            if (_.isArray(newBase)) {
                newBase = _.map(newBase, function (i) {
                    return num2dot(i);
                }).join(',');
            } else {
                newBase = num2dot(newBase);
            }
        }
        var row = [num2dot(ip.low), num2dot(ip.high), newBase, newIP];
        lines.push(row.join(' ~ '));
    }
    return lines.join(' ; ');
}

//function UNMANAGED(label_pattern, rType_pattern, target_pattern) {
//    return function (d) {
//        d.unmanaged.push({
//            label_pattern: label_pattern,
//            rType_pattern: rType_pattern,
//            target_pattern: target_pattern,
//        });
//    };
//}

function DISABLE_IGNORE_SAFETY_CHECK(d) {
    // This disables a safety check intended to prevent DNSControl and
    // another system getting into a battle as they both try to update
    // the same record over and over, back and forth.  However, people
    // kept asking for it so... caveat emptor!
    // It only affects the current domain.
    d.unmanaged_disable_safety_check = true;
}

// IGNORE(labelPattern, rtypePattern, targetPattern)
function IGNORE(labelPattern, rtypePattern, targetPattern) {
    if (labelPattern === undefined) {
        labelPattern = '*';
    }
    if (rtypePattern === undefined) {
        rtypePattern = '*';
    }
    if (targetPattern === undefined) {
        targetPattern = '*';
    }
    return function (d) {
        d.unmanaged.push({
            label_pattern: labelPattern,
            rType_pattern: rtypePattern,
            target_pattern: targetPattern,
        });
    };
}

// IGNORE_NAME(name, rTypes)
function IGNORE_NAME(name, rTypes) {
    return IGNORE(name, rTypes);
}

function IGNORE_TARGET(target, rType) {
    return IGNORE('*', rType, target);
}

// IMPORT_TRANSFORM(translation_table, domain)
var IMPORT_TRANSFORM = recordBuilder('IMPORT_TRANSFORM', {
    args: [['translation_table'], ['domain'], ['ttl', _.isNumber]],
    transform: function (record, args, modifiers) {
        record.name = '@';
        record.target = args.domain;
        record.meta['transform_table'] = format_tt(args.translation_table);
        record.ttl = args.ttl;
    },
});

// PURGE()
function PURGE(d) {
    d.KeepUnknown = false;
}

// NO_PURGE()
function NO_PURGE(d) {
    d.KeepUnknown = true;
}

// ENSURE_ABSENT_REC()
// Usage: A("foo", "1.2.3.4", ENSURE_ABSENT_REC())
function ENSURE_ABSENT_REC() {
    return function (r) {
        r.ensure_absent = true;
    };
}

// ENSURE_ABSENT()
// Usage: ENSURE_ABSENT(A("foo", "1.2.3.4"))
// (BROKEN. COMMENTED OUT UNTIL IT IS FIXED.)
// function ENSURE_ABSENT(r) {
//   //console.log(r);
//   return r;
// }

// AUTODNSSEC
// Permitted values are:
// ""  Do not modify the setting (the default)
// "on"   Enable AUTODNSSEC for this domain
// "off"  Disable AUTODNSSEC for this domain
function AUTODNSSEC_ON(d) {
    d.auto_dnssec = 'on';
}
function AUTODNSSEC_OFF(d) {
    d.auto_dnssec = 'off';
}
function AUTODNSSEC(d) {
    console.log(
        'WARNING: AUTODNSSEC is deprecated. It is now a no-op.  Please use AUTODNSSEC_ON or AUTODNSSEC_OFF. The default is to make no modifications. This message will disappear in a future release.'
    );
}

/**
 * @deprecated
 */
function getModifiers(args, start) {
    var mods = [];
    for (var i = start; i < args.length; i++) {
        mods.push(args[i]);
    }
    return mods;
}

/**
 * Record type builder
 * @param {string} type Record type
 * @param {string} opts.args[][0] Argument name
 * @param {function=} opts.args[][1] Optional validator
 * @param {function=} opts.transform Function to apply arguments to record.
 *        Take (record, args, modifier) as arguments. Any modifiers will be
 *        applied before this function. It should mutate the given record.
 * @param {function=} opts.applyModifier Function to apply modifiers to the record
 */
function recordBuilder(type, opts) {
    opts = _.defaults({}, opts, {
        args: [['name', _.isString], ['target']],

        transform: function (record, args, modifiers) {
            // record will have modifiers already applied
            // args will be an object for parameters defined
            record.name = args.name;
            if (_.isNumber(args.target)) {
                record.target = num2dot(args.target);
            } else {
                record.target = args.target;
            }
        },

        applyModifier: function (record, modifiers) {
            for (var i = 0; i < modifiers.length; i++) {
                var mod = modifiers[i];

                if (_.isFunction(mod)) {
                    mod(record);
                } else if (_.isObject(mod)) {
                    // convert transforms to strings
                    if (mod.transform && _.isArray(mod.transform)) {
                        mod.transform = format_tt(mod.transform);
                    }
                    _.extend(record.meta, mod);
                } else {
                    throw 'ERROR: Unknown modifier type';
                }
            }
        },
    });

    return function () {
        var parsedArgs = {};
        var modifiers = [];

        if (arguments.length < opts.args.length) {
            var argumentsList = opts.args
                .map(function (item) {
                    return item[0];
                })
                .join(', ');
            throw (
                type +
                ' record requires ' +
                opts.args.length +
                ' arguments (' +
                argumentsList +
                '). Only ' +
                arguments.length +
                ' were supplied'
            );
            return;
        }

        // collect arguments
        for (var i = 0; i < opts.args.length; i++) {
            var argDefinition = opts.args[i];
            var value = arguments[i];
            if (argDefinition.length > 1) {
                // run validator if supplied
                if (!argDefinition[1](value)) {
                    throw (
                        type +
                        ' record ' +
                        argDefinition[0] +
                        ' argument validation failed'
                    );
                }
            }
            parsedArgs[argDefinition[0]] = value;
        }

        // collect modifiers
        for (var i = opts.args.length; i < arguments.length; i++) {
            modifiers.push(arguments[i]);
        }

        return function (d) {
            var record = {
                type: type,
                meta: {},
                ttl: d.defaultTTL,
            };

            opts.applyModifier(record, modifiers);
            opts.transform(record, parsedArgs, modifiers);

            // Handle D_EXTEND() with subdomains.
            if (
                d.subdomain &&
                record.type != 'CF_REDIRECT' &&
                record.type != 'CF_TEMP_REDIRECT' &&
                record.type != 'CF_WORKER_ROUTE'
            ) {
                fqdn = [d.subdomain, d.name].join('.');

                record.subdomain = d.subdomain;
                if (record.name == '@') {
                    record.subdomain = d.subdomain;
                    record.name = d.subdomain;
                } else if (fqdn != record.name && record.type != 'PTR') {
                    record.subdomain = d.subdomain;
                    record.name += '.' + d.subdomain;
                }
            }

            // Now we finally have the record. If it is a normal record, we add
            // it to "records". If it is an ENSURE_ABSENT record, we add it to
            // the ensure_absent list.
            if (record.ensure_absent) {
                d.recordsabsent.push(record);
            } else {
                d.records.push(record);
            }

            return record;
        };
    };
}

/**
 * @deprecated
 */
function addRecord(d, type, name, target, mods) {
    // if target is number, assume ip address. convert it.
    if (_.isNumber(target)) {
        target = num2dot(target);
    }
    var rec = {
        type: type,
        name: name,
        target: target,
        ttl: d.defaultTTL,
        priority: 0,
        meta: {},
    };
    // for each modifier, decide based on type:
    // - Function: call is with the record as the argument
    // - Object: merge it into the metadata
    // - Number: IF MX record assume it is priority
    if (mods) {
        for (var i = 0; i < mods.length; i++) {
            var m = mods[i];
            if (_.isFunction(m)) {
                m(rec);
            } else if (_.isObject(m)) {
                // convert transforms to strings
                if (m.transform && _.isArray(m.transform)) {
                    m.transform = format_tt(m.transform);
                }
                _.extend(rec.meta, m);
                _.extend(rec.meta, m);
            } else {
                console.log(
                    'WARNING: Modifier type unsupported:',
                    typeof m,
                    '(Skipping!)'
                );
            }
        }
    }
    d.records.push(rec);
    return rec;
}

// ip conversion functions from http://stackoverflow.com/a/8105740/121660
// via http://javascript.about.com/library/blipconvert.htm
function IP(dot) {
    var d = dot.split('.');
    // prettier-ignore
    return ((((((+d[0]) * 256) + (+d[1])) * 256) + (+d[2])) * 256) + (+d[3]);
}

function num2dot(num) {
    if (num === undefined) {
        return '';
    }
    if (_.isString(num)) {
        return num;
    }
    var d = num % 256;
    for (var i = 3; i > 0; i--) {
        num = Math.floor(num / 256);
        d = (num % 256) + '.' + d;
    }
    return d;
}

// Cloudflare aliases:

// Meta settings for individual records.
var CF_PROXY_OFF = { cloudflare_proxy: 'off' }; // Proxy disabled.
var CF_PROXY_ON = { cloudflare_proxy: 'on' }; // Proxy enabled.
var CF_PROXY_FULL = { cloudflare_proxy: 'full' }; // Proxy+Railgun enabled.
// Per-domain meta settings:
// Proxy default off for entire domain (the default):
var CF_PROXY_DEFAULT_OFF = { cloudflare_proxy_default: 'off' };
// Proxy default on for entire domain:
var CF_PROXY_DEFAULT_ON = { cloudflare_proxy_default: 'on' };
// UniversalSSL off for entire domain:
var CF_UNIVERSALSSL_OFF = { cloudflare_universalssl: 'off' };
// UniversalSSL on for entire domain:
var CF_UNIVERSALSSL_ON = { cloudflare_universalssl: 'on' };

// CUSTOM, PROVIDER SPECIFIC RECORD TYPES

function _validateCloudflareRedirect(value) {
    if (!_.isString(value)) {
        return false;
    }
    return value.indexOf(',') === -1;
}

var CF_REDIRECT = recordBuilder('CF_REDIRECT', {
    args: [
        ['source', _validateCloudflareRedirect],
        ['destination', _validateCloudflareRedirect],
    ],
    transform: function (record, args, modifiers) {
        record.name = '@';
        record.target = args.source + ',' + args.destination;
    },
});

var CF_TEMP_REDIRECT = recordBuilder('CF_TEMP_REDIRECT', {
    args: [
        ['source', _validateCloudflareRedirect],
        ['destination', _validateCloudflareRedirect],
    ],
    transform: function (record, args, modifiers) {
        record.name = '@';
        record.target = args.source + ',' + args.destination;
    },
});

var CF_WORKER_ROUTE = recordBuilder('CF_WORKER_ROUTE', {
    args: [
        ['pattern', _validateCloudflareRedirect],
        ['script', _validateCloudflareRedirect],
    ],
    transform: function (record, args, modifiers) {
        record.name = '@';
        record.target = args.pattern + ',' + args.script;
    },
});

var URL = recordBuilder('URL');
var URL301 = recordBuilder('URL301');
var FRAME = recordBuilder('FRAME');
var NS1_URLFWD = recordBuilder('NS1_URLFWD');
var CLOUDNS_WR = recordBuilder('CLOUDNS_WR');

// LOC_BUILDER_DD takes an object:
// label: The DNS label for the LOC record. (default: '@')
// x: Decimal X coordinate.
// y: Decimal Y coordinate.
// alt: Altitude in m. You imperial measurement system people are suckers for punishment.
// ttl: The time for TTL, integer or string. (default: not defined, using DefaultTTL)

function LOC_BUILDER_DD(value) {
    if (!value.x && !value.y) {
        throw 'LOC_BUILDER_DD requires x and y elements';
    }

    if (!value.label) {
        value.label = '@';
    }

    var lati = ConvertDDToDMS(value.x, false);
    var long = ConvertDDToDMS(value.y, true);

    dms = { lati: lati, long: long };

    return LOC_builder_push(value, dms);
}

// LOC_BUILDER_DMM_STR takes an object:
// label: The DNS label for the LOC record. (default: '@')
// str: Input string of Degrees and decimal minutes (DMM) coordinates in the form: 25.24°S 153.15°E
// alt: Altitude in m. You imperial measurement system people are suckers for punishment.
// ttl: The time for TTL, integer or string. (default: not defined, using DefaultTTL)

function LOC_BUILDER_DMM_STR(value) {
    if (!value.str) {
        throw 'LOC_BUILDER_DMM_STR requires a string of the form 25.24°S 153.15°E';
    }

    if (!value.label) {
        value.label = '@';
    }

    var dms = parseDMMCoordinatesString(value.str);

    return LOC_builder_push(value, dms);
}

// LOC_BUILDER_DMS_STR takes an object:
// label: The DNS label for the LOC record. (default: '@')
// str: Input string of degrees, minutes, and seconds (DMS) coordinates in the form: 41°24'12.2"N 2°10'26.5"E
// alt: Altitude in m. You imperial measurement system people are suckers for punishment.
// ttl: The time for TTL, integer or string. (default: not defined, using DefaultTTL)

function LOC_BUILDER_DMS_STR(value) {
    if (!value.str) {
        throw 'LOC_BUILDER_DMS_STR requires a string of the form 33°51′31″S 151°12′51″Es (or 33°51\'31"S 151°12\'51"Es)';
    }

    if (!value.label) {
        value.label = '@';
    }

    var dms = parseDMSCoordinatesString(value.str);

    return LOC_builder_push(value, dms);
}

// LOC_BUILDER_STR takes an object:
// label: The DNS label for the LOC record. (default: '@')
// str: Input string of degrees, minutes, and seconds (DMS) coordinates in the form: 41°24'12.2"N 2°10'26.5"E
// alt: Altitude in m. You imperial measurement system people are suckers for punishment.
// ttl: The time for TTL, integer or string. (default: not defined, using DefaultTTL)

function LOC_BUILDER_STR(value) {
    if (!value.str) {
        throw 'LOC_BUILDER_STR requires a string';
    }

    if (!value.label) {
        value.label = '@';
    }

    var dms = parseDMMCoordinatesString(value.str);
    if (!dms) dms = parseDMSCoordinatesString(value.str);

    return LOC_builder_push(value, dms);
}

function LOC_builder_push(value, dms) {
    r = []; // The list of records to return.
    p = {}; // The metaparameters to set on the LOC record.
    // rawloc = "";

    // Generate a LOC record with the metaparameters.
    if (value.ttl) {
        if (value.alt)
            r.push(
                LOC(
                    value.label,
                    dms.lati.dg,
                    dms.lati.mn,
                    dms.lati.sc,
                    dms.lati.hemi,
                    dms.long.dg,
                    dms.long.mn,
                    dms.long.sc,
                    dms.long.hemi,
                    value.alt,
                    0,
                    0,
                    0,
                    p,
                    TTL(value.ttl)
                )
            );
        else
            r.push(
                LOC(
                    value.label,
                    dms.lati.dg,
                    dms.lati.mn,
                    dms.lati.sc,
                    dms.lati.hemi,
                    dms.long.dg,
                    dms.long.mn,
                    dms.long.sc,
                    dms.long.hemi,
                    0,
                    0,
                    0,
                    0,
                    p,
                    TTL(value.ttl)
                )
            );
    } else {
        if (value.alt)
            r.push(
                LOC(
                    value.label,
                    dms.lati.dg,
                    dms.lati.mn,
                    dms.lati.sc,
                    dms.lati.hemi,
                    dms.long.dg,
                    dms.long.mn,
                    dms.long.sc,
                    dms.long.hemi,
                    value.alt,
                    0,
                    0,
                    0,
                    p
                )
            );
        else
            r.push(
                LOC(
                    value.label,
                    dms.lati.dg,
                    dms.lati.mn,
                    dms.lati.sc,
                    dms.lati.hemi,
                    dms.long.dg,
                    dms.long.mn,
                    dms.long.sc,
                    dms.long.hemi,
                    0,
                    0,
                    0,
                    0,
                    p
                )
            );
    }

    return r;
}

// SPF_BUILDER takes an object:
// parts: The parts of the SPF record (to be joined with ' ').
// label: The DNS label for the primary SPF record. (default: '@')
// raw: Where (which label) to store an unaltered version of the SPF settings.
// ttl: The time for TTL, integer or string. (default: not defined, using DefaultTTL)
// split: The template for additional records to be created (default: '_spf%d')
// flatten: A list of domains to be flattened.
// overhead1: Amout of "buffer room" to reserve on the first item in the spf chain.
// txtMaxSize: The maximum size for each TXT string. Values over 255 will result in multiple strings (default: '255')

function SPF_BUILDER(value) {
    if (!value.parts || value.parts.length < 2) {
        throw 'SPF_BUILDER requires at least 2 elements';
    }
    if (!value.label) {
        value.label = '@';
    }
    if (!value.raw && value.raw !== '') {
        value.raw = '_rawspf';
    }

    r = []; // The list of records to return.
    p = {}; // The metaparameters to set on the main TXT record.
    rawspf = value.parts.join(' '); // The unaltered SPF settings.

    // If flattening is requested, generate a TXT record with the raw SPF settings.
    if (value.flatten && value.flatten.length > 0) {
        p.flatten = value.flatten.join(',');
        // Only add the raw spf record if it isn't an empty string
        if (value.raw !== '') {
            rp = {};
            if (value.ttl) {
                r.push(TXT(value.raw, rawspf, rp, TTL(value.ttl)));
            } else {
                r.push(TXT(value.raw, rawspf, rp));
            }
        }
    }

    // If overflow is specified, enable splitting.
    if (value.overflow) {
        p.split = value.overflow;
    }

    if (value.overhead1) {
        p.overhead1 = value.overhead1;
    }

    if (value.txtMaxSize) {
        p.txtMaxSize = value.txtMaxSize;
    }

    // Generate a TXT record with the metaparameters.
    if (value.ttl) {
        r.push(TXT(value.label, rawspf, p, TTL(value.ttl)));
    } else {
        r.push(TXT(value.label, rawspf, p));
    }

    return r;
}

// CAA_BUILDER takes an object:
// label: The DNS label for the CAA record. (default: '@')
// iodef: The contact mail address. (optional)
// iodef_critical: Boolean if sending report is required/critical. If not supported, certificate should be refused. (optional)
// issue: List of CAs which are allowed to issue certificates for the domain (creates one record for each).
// issuewild: Allowed CAs which can issue wildcard certificates for this domain. (creates one record for each)

function CAA_BUILDER(value) {
    if (!value.label) {
        value.label = '@';
    }

    if (value.issue && value.issue == 'none') value.issue = [';'];
    if (value.issuewild && value.issuewild == 'none') value.issuewild = [';'];

    if (
        (!value.issue && !value.issuewild) ||
        (value.issue &&
            value.issue.length == 0 &&
            value.issuewild &&
            value.issuewild.length == 0)
    ) {
        throw 'CAA_BUILDER requires at least one entry at issue or issuewild';
    }

    r = []; // The list of records to return.

    if (value.iodef) {
        if (value.iodef_critical) {
            r.push(CAA(value.label, 'iodef', value.iodef, CAA_CRITICAL));
        } else {
            r.push(CAA(value.label, 'iodef', value.iodef));
        }
    }

    if (value.issue) {
        var flag = function () {};
        if (value.issue_critical) {
            flag = CAA_CRITICAL;
        }
        for (var i = 0, len = value.issue.length; i < len; i++)
            r.push(CAA(value.label, 'issue', value.issue[i], flag));
    }

    if (value.issuewild) {
        var flag = function () {};
        if (value.issuewild_critical) {
            flag = CAA_CRITICAL;
        }
        for (var i = 0, len = value.issuewild.length; i < len; i++)
            r.push(CAA(value.label, 'issuewild', value.issuewild[i], flag));
    }

    return r;
}

// DMARC_BUILDER takes an object:
// label: The DNS label for the DMARC record (_dmarc prefix is added; default: '@')
// version: The DMARC version, by default DMARC1 (optional)
// policy: The DMARC policy (p=), must be one of 'none', 'quarantine', 'reject'
// subdomainPolicy: The DMARC policy for subdomains (sp=), must be one of 'none', 'quarantine', 'reject' (optional)
// alignmentSPF: 'strict'/'s' or 'relaxed'/'r' alignment for SPF (aspf=, default: 'r')
// alignmentDKIM: 'strict'/'s' or 'relaxed'/'r' alignment for DKIM (adkim=, default: 'r')
// percent: Number between 0 and 100, percentage for which policies are applied (pct=, default: 100)
// rua: Array of aggregate report targets (optional)
// ruf: Array of failure report targets (optional)
// failureOptions: Object or string; Object containing booleans SPF and DKIM, string is passed raw (fo=, default: '0')
// failureFormat: Format in which failure reports are requested (rf=, default: 'afrf')
// reportInterval: Interval in which reports are requested (ri=)
// ttl: Input for TTL method
function DMARC_BUILDER(value) {
    if (!value) {
        value = {};
    }
    if (!value.label) {
        value.label = '@';
    }

    if (!value.version) {
        value.version = 'DMARC1';
    }

    var label = '_dmarc';
    if (value.label !== '@') {
        label += '.' + value.label;
    }

    if (!value.policy) {
        value.policy = 'none';
    }

    if (
        !value.policy === 'none' ||
        !value.policy === 'quarantine' ||
        !value.policy === 'reject'
    ) {
        throw 'Invalid DMARC policy';
    }

    var record = [];
    record.push('v=' + value.version);
    record.push('p=' + value.policy);

    // Subdomain policy
    if (
        !value.subdomainPolicy === 'none' ||
        !value.subdomainPolicy === 'quarantine' ||
        !value.subdomainPolicy === 'reject'
    ) {
        throw 'Invalid DMARC subdomain policy';
    }
    if (value.subdomainPolicy) {
        record.push('sp=' + value.subdomainPolicy);
    }

    // Alignment DKIM
    if (value.alignmentDKIM) {
        switch (value.alignmentDKIM) {
            case 'relaxed':
                value.alignmentDKIM = 'r';
                break;
            case 'strict':
                value.alignmentDKIM = 's';
                break;
            case 'r':
            case 's':
                break;
            default:
                throw 'Invalid DMARC DKIM alignment policy';
        }
        record.push('adkim=' + value.alignmentDKIM);
    }

    // Alignment SPF
    if (value.alignmentSPF) {
        switch (value.alignmentSPF) {
            case 'relaxed':
                value.alignmentSPF = 'r';
                break;
            case 'strict':
                value.alignmentSPF = 's';
                break;
            case 'r':
            case 's':
                break;
            default:
                throw 'Invalid DMARC DKIM alignment policy';
        }
        record.push('aspf=' + value.alignmentSPF);
    }

    // Percentage
    if (value.percent) {
        record.push('pct=' + value.percent);
    }

    // Aggregate reports
    if (value.rua && value.rua.length > 0) {
        record.push('rua=' + value.rua.join(','));
    }

    // Failure reports
    if (value.ruf && value.ruf.length > 0) {
        record.push('ruf=' + value.ruf.join(','));
    }

    // Failure reporting options
    if (value.ruf && value.failureOptions) {
        var fo = '0';
        if (_.isObject(value.failureOptions)) {
            if (value.failureOptions.DKIM) {
                fo = 'd';
            }
            if (value.failureOptions.SPF) {
                fo = 's';
            }
            if (value.failureOptions.DKIM && value.failureOptions.SPF) {
                fo = '1';
            }
        } else {
            fo = value.failureOptions;
        }

        if (fo !== '0') {
            record.push('fo=' + fo);
        }
    }

    // Failure report format
    if (value.ruf && value.failureFormat) {
        record.push('rf=' + value.failureFormat);
    }

    // Report interval
    if (value.reportInterval) {
        if (_.isString(value.reportInterval)) {
            value.reportInterval = stringToDuration(value.reportInterval);
        }

        record.push('ri=' + value.reportInterval);
    }

    if (value.ttl) {
        return TXT(label, record.join('; '), TTL(value.ttl));
    }
    return TXT(label, record.join('; '));
}

// Documentation of the records: https://learn.microsoft.com/en-us/microsoft-365/enterprise/external-domain-name-system-records?view=o365-worldwide
function M365_BUILDER(name, value) {
    // value is optional
    if (!value) {
        value = {};
    }

    if (value.mx !== false) {
        value.mx = true;
    }
    if (value.autodiscover !== false) {
        value.autodiscover = true;
    }
    if (value.dkim !== false) {
        value.dkim = true;
    }

    if (!value.label) {
        value.label = '@';
    }

    if (!value.domainGUID) {
        // Does not work with dashes in domain name.
        // Microsoft uses its own, (probably) deterministic algorithm to transform these domains.
        // Unfortunately, underlying algorithm is not known to us.
        if (name.indexOf('-') !== -1) {
            throw (
                'M365_BUILDER requires domainGUID for domains with dashes: ' +
                name
            );
        }

        value.domainGUID = name.replace('.', '-');
    }

    if (value.dkim && !value.initialDomain) {
        throw (
            "M365_BUILDER requires your M365 account's initial domain to set up DKIM (default: enabled): " +
            name
        );
    }

    var r = [];

    // MX (default: true)
    if (value.mx) {
        r.push(
            MX(
                value.label,
                0,
                value.domainGUID + '.mail.protection.outlook.com.'
            )
        );
    }

    // Autodiscover (default: true)
    if (value.autodiscover) {
        if ((value.label = '@')) {
            r.push(CNAME('autodiscover', 'autodiscover.outlook.com.'));
        } else {
            r.push(
                CNAME(
                    'autodiscover.' + value.label,
                    'autodiscover.outlook.com.'
                )
            );
        }
    }

    // DKIM (default: true)
    if (value.dkim) {
        r.push(
            CNAME(
                'selector1._domainkey',
                'selector1-' +
                    value.domainGUID +
                    '._domainkey.' +
                    value.initialDomain +
                    '.'
            )
        );
        r.push(
            CNAME(
                'selector2._domainkey',
                'selector2-' +
                    value.domainGUID +
                    '._domainkey.' +
                    value.initialDomain +
                    '.'
            )
        );
    }

    // Skype for Business (default: false)
    if (value.skypeForBusiness) {
        r.push(CNAME('lyncdiscover', 'webdir.online.lync.com.'));
        r.push(CNAME('sip', 'sipdir.online.lync.com.'));
        r.push(SRV('_sip._tls', 100, 1, 443, 'sipdir.online.lync.com.'));
        r.push(
            SRV(
                '_sipfederationtls._tcp',
                100,
                1,
                5061,
                'sipfed.online.lync.com.'
            )
        );
    }

    // Mobile Device Management (default: false)
    if (value.mdm) {
        r.push(
            CNAME(
                'enterpriseregistration',
                'enterpriseregistration.windows.net.'
            )
        );
        r.push(
            CNAME(
                'enterpriseenrollment',
                'enterpriseenrollment.manage.microsoft.com.'
            )
        );
    }

    return r;
}

// This is a no-op.  Long TXT records are handled natively now.
function DKIM(arr) {
    return arr;
}

// Function wrapper for glob() for recursively loading files.
// As the main function (in Go) is in our control anyway, all the values here are already sanity-checked.
// Note: glob() is only an internal undocumented helper function. So use it on your own risk.
function require_glob() {
    arguments[2] = 'js'; // force to only include .js files.
    var files = glob.apply(null, arguments);
    for (var i = 0; i < files.length; i++) {
        require(files[i]);
    }
    return files;
}

// Set default values for CLI variables
function CLI_DEFAULTS(defaults) {
    for (var key in defaults) {
        if (typeof this[key] === 'undefined') {
            this[key] = defaults[key];
        }
    }
}

function FETCH() {
    return fetch.apply(null, arguments).catch(PANIC);
}

// DOMAIN_ELSEWHERE is a helper macro that delegates a domain to a
// static list of nameservers.  It updates the registrar (the parent)
// with a list of nameservers.  This is used when we own the domain (we
// control the registrar) but something else controls the DNS records
// (often a third-party of Azure).
// Usage: DOMAIN_ELSEWHERE("example.com", REG_NAMEDOTCOM, ["ns1.foo.com", "ns2.foo.com"]);
function DOMAIN_ELSEWHERE(domain, registrar, nslist) {
    D(domain, registrar, NO_PURGE);
    // NB(tlim): NO_PURGE is added as a precaution since something else
    // is maintaining the DNS records in that zone.  In theory this is
    // not needed since this domain won't have a DSP defined.
    for (var i = 0; i < nslist.length; i++) {
        D_EXTEND(domain, NAMESERVER(nslist[i]));
    }
}

// DOMAIN_ELSEWHERE_AUTO is similar to DOMAIN_ELSEWHERE but the list of
// nameservers is queried from a DNS Service Provider.
// Usage: DOMAIN_ELSEWHERE_AUTO("example.com", REG_NAMEDOTCOM, DNS_FOO)
function DOMAIN_ELSEWHERE_AUTO(domain, registrar, dsplist) {
    D(domain, registrar, NO_PURGE);
    // NB(tlim): NO_PURGE is required since something else
    // is maintaining the DNS records in that zone, and we have access
    // to updating it (but we don't want to use it.)
    for (var i = 2; i < arguments.length; i++) {
        D_EXTEND(domain, DnsProvider(arguments[i]));
    }
}

var END = {}; // This is null. It permits the last item to include a comma.
// D("foo.com", ...
//    A(...),
//    A(...),
//    A(...),
// END)

// Record modifiers:

// Permit labels like "foo.bar.com.bar.com" (normally an error):
var DISABLE_REPEATED_DOMAIN_CHECK = { skip_fqdn_check: 'true' };
// D("bar.com", ...
//     A("foo.bar.com", "10.1.1.1", DISABLE_REPEATED_DOMAIN_CHECK),
// )