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const Assert = require('@hapi/hoek/lib/assert');
const EscapeRegex = require('@hapi/hoek/lib/escapeRegex');
const internals = {};
internals.generate = function () {
const rfc3986 = {};
const hexDigit = '\\dA-Fa-f'; // HEXDIG = DIGIT / "A" / "B" / "C" / "D" / "E" / "F"
const hexDigitOnly = '[' + hexDigit + ']';
const unreserved = '\\w-\\.~'; // unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
const subDelims = '!\\$&\'\\(\\)\\*\\+,;='; // sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
const pctEncoded = '%' + hexDigit; // pct-encoded = "%" HEXDIG HEXDIG
const pchar = unreserved + pctEncoded + subDelims + ':@'; // pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
const pcharOnly = '[' + pchar + ']';
const decOctect = '(?:0{0,2}\\d|0?[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5])'; // dec-octet = DIGIT / %x31-39 DIGIT / "1" 2DIGIT / "2" %x30-34 DIGIT / "25" %x30-35 ; 0-9 / 10-99 / 100-199 / 200-249 / 250-255
rfc3986.ipv4address = '(?:' + decOctect + '\\.){3}' + decOctect; // IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
/*
h16 = 1*4HEXDIG ; 16 bits of address represented in hexadecimal
ls32 = ( h16 ":" h16 ) / IPv4address ; least-significant 32 bits of address
IPv6address = 6( h16 ":" ) ls32
/ "::" 5( h16 ":" ) ls32
/ [ h16 ] "::" 4( h16 ":" ) ls32
/ [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32
/ [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32
/ [ *3( h16 ":" ) h16 ] "::" h16 ":" ls32
/ [ *4( h16 ":" ) h16 ] "::" ls32
/ [ *5( h16 ":" ) h16 ] "::" h16
/ [ *6( h16 ":" ) h16 ] "::"
*/
const h16 = hexDigitOnly + '{1,4}';
const ls32 = '(?:' + h16 + ':' + h16 + '|' + rfc3986.ipv4address + ')';
const IPv6SixHex = '(?:' + h16 + ':){6}' + ls32;
const IPv6FiveHex = '::(?:' + h16 + ':){5}' + ls32;
const IPv6FourHex = '(?:' + h16 + ')?::(?:' + h16 + ':){4}' + ls32;
const IPv6ThreeHex = '(?:(?:' + h16 + ':){0,1}' + h16 + ')?::(?:' + h16 + ':){3}' + ls32;
const IPv6TwoHex = '(?:(?:' + h16 + ':){0,2}' + h16 + ')?::(?:' + h16 + ':){2}' + ls32;
const IPv6OneHex = '(?:(?:' + h16 + ':){0,3}' + h16 + ')?::' + h16 + ':' + ls32;
const IPv6NoneHex = '(?:(?:' + h16 + ':){0,4}' + h16 + ')?::' + ls32;
const IPv6NoneHex2 = '(?:(?:' + h16 + ':){0,5}' + h16 + ')?::' + h16;
const IPv6NoneHex3 = '(?:(?:' + h16 + ':){0,6}' + h16 + ')?::';
rfc3986.ipv4Cidr = '(?:\\d|[1-2]\\d|3[0-2])'; // IPv4 cidr = DIGIT / %x31-32 DIGIT / "3" %x30-32 ; 0-9 / 10-29 / 30-32
rfc3986.ipv6Cidr = '(?:0{0,2}\\d|0?[1-9]\\d|1[01]\\d|12[0-8])'; // IPv6 cidr = DIGIT / %x31-39 DIGIT / "1" %x0-1 DIGIT / "12" %x0-8; 0-9 / 10-99 / 100-119 / 120-128
rfc3986.ipv6address = '(?:' + IPv6SixHex + '|' + IPv6FiveHex + '|' + IPv6FourHex + '|' + IPv6ThreeHex + '|' + IPv6TwoHex + '|' + IPv6OneHex + '|' + IPv6NoneHex + '|' + IPv6NoneHex2 + '|' + IPv6NoneHex3 + ')';
rfc3986.ipvFuture = 'v' + hexDigitOnly + '+\\.[' + unreserved + subDelims + ':]+'; // IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
rfc3986.scheme = '[a-zA-Z][a-zA-Z\\d+-\\.]*'; // scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
rfc3986.schemeRegex = new RegExp(rfc3986.scheme);
const userinfo = '[' + unreserved + pctEncoded + subDelims + ':]*'; // userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
const IPLiteral = '\\[(?:' + rfc3986.ipv6address + '|' + rfc3986.ipvFuture + ')\\]'; // IP-literal = "[" ( IPv6address / IPvFuture ) "]"
const regName = '[' + unreserved + pctEncoded + subDelims + ']{1,255}'; // reg-name = *( unreserved / pct-encoded / sub-delims )
const host = '(?:' + IPLiteral + '|' + rfc3986.ipv4address + '|' + regName + ')'; // host = IP-literal / IPv4address / reg-name
const port = '\\d*'; // port = *DIGIT
const authority = '(?:' + userinfo + '@)?' + host + '(?::' + port + ')?'; // authority = [ userinfo "@" ] host [ ":" port ]
const authorityCapture = '(?:' + userinfo + '@)?(' + host + ')(?::' + port + ')?';
/*
segment = *pchar
segment-nz = 1*pchar
path = path-abempty ; begins with "/" '|' is empty
/ path-absolute ; begins with "/" but not "//"
/ path-noscheme ; begins with a non-colon segment
/ path-rootless ; begins with a segment
/ path-empty ; zero characters
path-abempty = *( "/" segment )
path-absolute = "/" [ segment-nz *( "/" segment ) ]
path-rootless = segment-nz *( "/" segment )
*/
const segment = pcharOnly + '*';
const segmentNz = pcharOnly + '+';
const segmentNzNc = '[' + unreserved + pctEncoded + subDelims + '@' + ']+';
const pathEmpty = '';
const pathAbEmpty = '(?:\\/' + segment + ')*';
const pathAbsolute = '\\/(?:' + segmentNz + pathAbEmpty + ')?';
const pathRootless = segmentNz + pathAbEmpty;
const pathNoScheme = segmentNzNc + pathAbEmpty;
const pathAbNoAuthority = '(?:\\/\\/\\/' + segment + pathAbEmpty + ')'; // Used by file:///
// hier-part = "//" authority path
rfc3986.hierPart = '(?:' + '(?:\\/\\/' + authority + pathAbEmpty + ')' + '|' + pathAbsolute + '|' + pathRootless + '|' + pathAbNoAuthority + ')';
rfc3986.hierPartCapture = '(?:' + '(?:\\/\\/' + authorityCapture + pathAbEmpty + ')' + '|' + pathAbsolute + '|' + pathRootless + ')';
// relative-part = "//" authority path-abempty / path-absolute / path-noscheme / path-empty
rfc3986.relativeRef = '(?:' + '(?:\\/\\/' + authority + pathAbEmpty + ')' + '|' + pathAbsolute + '|' + pathNoScheme + '|' + pathEmpty + ')';
rfc3986.relativeRefCapture = '(?:' + '(?:\\/\\/' + authorityCapture + pathAbEmpty + ')' + '|' + pathAbsolute + '|' + pathNoScheme + '|' + pathEmpty + ')';
// query = *( pchar / "/" / "?" )
// query = *( pchar / "[" / "]" / "/" / "?" )
rfc3986.query = '[' + pchar + '\\/\\?]*(?=#|$)'; //Finish matching either at the fragment part '|' end of the line.
rfc3986.queryWithSquareBrackets = '[' + pchar + '\\[\\]\\/\\?]*(?=#|$)';
// fragment = *( pchar / "/" / "?" )
rfc3986.fragment = '[' + pchar + '\\/\\?]*';
return rfc3986;
};
internals.rfc3986 = internals.generate();
exports.ip = {
v4Cidr: internals.rfc3986.ipv4Cidr,
v6Cidr: internals.rfc3986.ipv6Cidr,
ipv4: internals.rfc3986.ipv4address,
ipv6: internals.rfc3986.ipv6address,
ipvfuture: internals.rfc3986.ipvFuture
};
internals.createRegex = function (options) {
const rfc = internals.rfc3986;
// Construct expression
const query = options.allowQuerySquareBrackets ? rfc.queryWithSquareBrackets : rfc.query;
const suffix = '(?:\\?' + query + ')?' + '(?:#' + rfc.fragment + ')?';
// relative-ref = relative-part [ "?" query ] [ "#" fragment ]
const relative = options.domain ? rfc.relativeRefCapture : rfc.relativeRef;
if (options.relativeOnly) {
return internals.wrap(relative + suffix);
}
// Custom schemes
let customScheme = '';
if (options.scheme) {
Assert(options.scheme instanceof RegExp || typeof options.scheme === 'string' || Array.isArray(options.scheme), 'scheme must be a RegExp, String, or Array');
const schemes = [].concat(options.scheme);
Assert(schemes.length >= 1, 'scheme must have at least 1 scheme specified');
// Flatten the array into a string to be used to match the schemes
const selections = [];
for (let i = 0; i < schemes.length; ++i) {
const scheme = schemes[i];
Assert(scheme instanceof RegExp || typeof scheme === 'string', 'scheme at position ' + i + ' must be a RegExp or String');
if (scheme instanceof RegExp) {
selections.push(scheme.source.toString());
}
else {
Assert(rfc.schemeRegex.test(scheme), 'scheme at position ' + i + ' must be a valid scheme');
selections.push(EscapeRegex(scheme));
}
}
customScheme = selections.join('|');
}
// URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
const scheme = customScheme ? '(?:' + customScheme + ')' : rfc.scheme;
const absolute = '(?:' + scheme + ':' + (options.domain ? rfc.hierPartCapture : rfc.hierPart) + ')';
const prefix = options.allowRelative ? '(?:' + absolute + '|' + relative + ')' : absolute;
return internals.wrap(prefix + suffix, customScheme);
};
internals.wrap = function (raw, scheme) {
raw = `(?=.)(?!https?\:/(?:$|[^/]))(?!https?\:///)(?!https?\:[^/])${raw}`; // Require at least one character and explicitly forbid 'http:/' or HTTP with empty domain
return {
raw,
regex: new RegExp(`^${raw}$`),
scheme
};
};
internals.uriRegex = internals.createRegex({});
exports.regex = function (options = {}) {
if (options.scheme ||
options.allowRelative ||
options.relativeOnly ||
options.allowQuerySquareBrackets ||
options.domain) {
return internals.createRegex(options);
}
return internals.uriRegex;
};
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