blockstack-zones/lib/parseZoneFile.js

A DNS zone file parser and generator

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.parseZoneFile = parseZoneFile;
function parseZoneFile(text) {
    text = removeComments(text);
    text = flatten(text);
    return parseRRs(text);
};

var removeComments = function removeComments(text) {
    var re = /(^|[^\\]);.*/g;
    return text.replace(re, function (m, g1) {
        return g1 ? g1 : ""; // if g1 is set/matched, re-insert it, else remove
    });
};

var flatten = function flatten(text) {
    var captured = [];
    var re = /\([\s\S]*?\)/gim;
    var match = re.exec(text);
    while (match !== null) {
        match.replacement = match[0].replace(/\s+/gm, ' ');
        captured.push(match);
        // captured Text, index, input
        match = re.exec(text);
    }
    var arrText = text.split('');
    for (var i in captured) {
        match = captured[i];
        arrText.splice(match.index, match[0].length, match.replacement);
    }
    return arrText.join('').replace(/\(|\)/gim, ' ');
};

var parseRRs = function parseRRs(text) {
    var ret = {};
    var rrs = text.split('\n');
    for (var i in rrs) {
        var rr = rrs[i];
        if (!rr || !rr.trim()) {
            continue;
        }
        var uRR = rr.toUpperCase();
        if (/\s+TXT\s+/.test(uRR)) {
            ret.txt = ret.txt || [];
            ret.txt.push(parseTXT(rr));
        } else if (uRR.indexOf('$ORIGIN') === 0) {
            ret.$origin = rr.split(/\s+/g)[1];
        } else if (uRR.indexOf('$TTL') === 0) {
            ret.$ttl = parseInt(rr.split(/\s+/g)[1], 10);
        } else if (/\s+SOA\s+/.test(uRR)) {
            ret.soa = parseSOA(rr);
        } else if (/\s+NS\s+/.test(uRR)) {
            ret.ns = ret.ns || [];
            ret.ns.push(parseNS(rr));
        } else if (/\s+A\s+/.test(uRR)) {
            ret.a = ret.a || [];
            ret.a.push(parseA(rr, ret.a));
        } else if (/\s+AAAA\s+/.test(uRR)) {
            ret.aaaa = ret.aaaa || [];
            ret.aaaa.push(parseAAAA(rr));
        } else if (/\s+CNAME\s+/.test(uRR)) {
            ret.cname = ret.cname || [];
            ret.cname.push(parseCNAME(rr));
        } else if (/\s+MX\s+/.test(uRR)) {
            ret.mx = ret.mx || [];
            ret.mx.push(parseMX(rr));
        } else if (/\s+PTR\s+/.test(uRR)) {
            ret.ptr = ret.ptr || [];
            ret.ptr.push(parsePTR(rr, ret.ptr, ret.$origin));
        } else if (/\s+SRV\s+/.test(uRR)) {
            ret.srv = ret.srv || [];
            ret.srv.push(parseSRV(rr));
        } else if (/\s+SPF\s+/.test(uRR)) {
            ret.spf = ret.spf || [];
            ret.spf.push(parseSPF(rr));
        } else if (/\s+URI\s+/.test(uRR)) {
            ret.uri = ret.uri || [];
            ret.uri.push(parseURI(rr));
        }
    }
    return ret;
};

var parseSOA = function parseSOA(rr) {
    var soa = {};
    var rrTokens = rr.trim().split(/\s+/g);
    var l = rrTokens.length;
    soa.name = rrTokens[0];
    soa.minimum = parseInt(rrTokens[l - 1], 10);
    soa.expire = parseInt(rrTokens[l - 2], 10);
    soa.retry = parseInt(rrTokens[l - 3], 10);
    soa.refresh = parseInt(rrTokens[l - 4], 10);
    soa.serial = parseInt(rrTokens[l - 5], 10);
    soa.rname = rrTokens[l - 6];
    soa.mname = rrTokens[l - 7];
    if (!isNaN(rrTokens[1])) soa.ttl = parseInt(rrTokens[1], 10);
    return soa;
};

var parseNS = function parseNS(rr) {
    var rrTokens = rr.trim().split(/\s+/g);
    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        host: rrTokens[l - 1]
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseA = function parseA(rr, recordsSoFar) {
    var rrTokens = rr.trim().split(/\s+/g);
    var urrTokens = rr.trim().toUpperCase().split(/\s+/g);
    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        ip: rrTokens[l - 1]
    };

    if (urrTokens.lastIndexOf('A') === 0) {
        if (recordsSoFar.length) {
            result.name = recordsSoFar[recordsSoFar.length - 1].name;
        } else {
            result.name = '@';
        }
    }

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseAAAA = function parseAAAA(rr) {
    var rrTokens = rr.trim().split(/\s+/g);
    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        ip: rrTokens[l - 1]
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseCNAME = function parseCNAME(rr) {
    var rrTokens = rr.trim().split(/\s+/g);
    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        alias: rrTokens[l - 1]
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseMX = function parseMX(rr) {
    var rrTokens = rr.trim().split(/\s+/g);
    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        preference: parseInt(rrTokens[l - 2], 10),
        host: rrTokens[l - 1]
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseTXT = function parseTXT(rr) {
    var rrTokens = rr.trim().match(/[^\s\"']+|\"[^\"]*\"|'[^']*'/g);
    var l = rrTokens.length;
    var tokenTxt = rrTokens[l - 1];
    if (tokenTxt.indexOf('\"') > -1) {
        tokenTxt = tokenTxt.split('\"')[1];
    }
    if (tokenTxt.indexOf('"') > -1) {
        tokenTxt = tokenTxt.split('"')[1];
    }
    var result = {
        name: rrTokens[0],
        txt: tokenTxt
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parsePTR = function parsePTR(rr, recordsSoFar, currentOrigin) {
    var rrTokens = rr.trim().split(/\s+/g);
    var urrTokens = rr.trim().toUpperCase().split(/\s+/g);

    if (urrTokens.lastIndexOf('PTR') === 0 && recordsSoFar[recordsSoFar.length - 1]) {
        rrTokens.unshift(recordsSoFar[recordsSoFar.length - 1].name);
    }

    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        fullname: rrTokens[0] + '.' + currentOrigin,
        host: rrTokens[l - 1]
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseSRV = function parseSRV(rr) {
    var rrTokens = rr.trim().split(/\s+/g);
    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        target: rrTokens[l - 1],
        priority: parseInt(rrTokens[l - 4], 10),
        weight: parseInt(rrTokens[l - 3], 10),
        port: parseInt(rrTokens[l - 2], 10)
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseSPF = function parseSPF(rr) {
    var rrTokens = rr.trim().split(/\s+/g);
    var result = {
        name: rrTokens[0],
        data: ''
    };

    var l = rrTokens.length;
    while (l-- > 4) {
        result.data = rrTokens[l] + ' ' + result.data.trim();
    }

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};

var parseURI = function parseURI(rr) {
    var rrTokens = rr.trim().split(/\s+/g);
    var l = rrTokens.length;
    var result = {
        name: rrTokens[0],
        target: rrTokens[l - 1].replace(/"/g, ''),
        priority: parseInt(rrTokens[l - 3], 10),
        weight: parseInt(rrTokens[l - 2], 10)
    };

    if (!isNaN(rrTokens[1])) result.ttl = parseInt(rrTokens[1], 10);
    return result;
};