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/**
* negotiator
* Copyright(c) 2012 Isaac Z. Schlueter
* Copyright(c) 2014 Federico Romero
* Copyright(c) 2014-2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict';
/**
* Module exports.
* @public
*/
module.exports = preferredEncodings;
module.exports.preferredEncodings = preferredEncodings;
/**
* Module variables.
* @private
*/
var simpleEncodingRegExp = /^\s*([^\s;]+)\s*(?:;(.*))?$/;
/**
* Parse the Accept-Encoding header.
* @private
*/
function parseAcceptEncoding(accept) {
var accepts = accept.split(',');
var hasIdentity = false;
var minQuality = 1;
for (var i = 0, j = 0; i < accepts.length; i++) {
var encoding = parseEncoding(accepts[i].trim(), i);
if (encoding) {
accepts[j++] = encoding;
hasIdentity = hasIdentity || specify('identity', encoding);
minQuality = Math.min(minQuality, encoding.q || 1);
}
}
if (!hasIdentity) {
/*
* If identity doesn't explicitly appear in the accept-encoding header,
* it's added to the list of acceptable encoding with the lowest q
*/
accepts[j++] = {
encoding: 'identity',
q: minQuality,
i: i
};
}
// trim accepts
accepts.length = j;
return accepts;
}
/**
* Parse an encoding from the Accept-Encoding header.
* @private
*/
function parseEncoding(str, i) {
var match = simpleEncodingRegExp.exec(str);
if (!match) return null;
var encoding = match[1];
var q = 1;
if (match[2]) {
var params = match[2].split(';');
for (var j = 0; j < params.length; j++) {
var p = params[j].trim().split('=');
if (p[0] === 'q') {
q = parseFloat(p[1]);
break;
}
}
}
return {
encoding: encoding,
q: q,
i: i
};
}
/**
* Get the priority of an encoding.
* @private
*/
function getEncodingPriority(encoding, accepted, index) {
var priority = {encoding: encoding, o: -1, q: 0, s: 0};
for (var i = 0; i < accepted.length; i++) {
var spec = specify(encoding, accepted[i], index);
if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {
priority = spec;
}
}
return priority;
}
/**
* Get the specificity of the encoding.
* @private
*/
function specify(encoding, spec, index) {
var s = 0;
if(spec.encoding.toLowerCase() === encoding.toLowerCase()){
s |= 1;
} else if (spec.encoding !== '*' ) {
return null
}
return {
encoding: encoding,
i: index,
o: spec.i,
q: spec.q,
s: s
}
};
/**
* Get the preferred encodings from an Accept-Encoding header.
* @public
*/
function preferredEncodings(accept, provided, preferred) {
var accepts = parseAcceptEncoding(accept || '');
var comparator = preferred ? function comparator (a, b) {
if (a.q !== b.q) {
return b.q - a.q // higher quality first
}
var aPreferred = preferred.indexOf(a.encoding)
var bPreferred = preferred.indexOf(b.encoding)
if (aPreferred === -1 && bPreferred === -1) {
// consider the original specifity/order
return (b.s - a.s) || (a.o - b.o) || (a.i - b.i)
}
if (aPreferred !== -1 && bPreferred !== -1) {
return aPreferred - bPreferred // consider the preferred order
}
return aPreferred === -1 ? 1 : -1 // preferred first
} : compareSpecs;
if (!provided) {
// sorted list of all encodings
return accepts
.filter(isQuality)
.sort(comparator)
.map(getFullEncoding);
}
var priorities = provided.map(function getPriority(type, index) {
return getEncodingPriority(type, accepts, index);
});
// sorted list of accepted encodings
return priorities.filter(isQuality).sort(comparator).map(function getEncoding(priority) {
return provided[priorities.indexOf(priority)];
});
}
/**
* Compare two specs.
* @private
*/
function compareSpecs(a, b) {
return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i);
}
/**
* Get full encoding string.
* @private
*/
function getFullEncoding(spec) {
return spec.encoding;
}
/**
* Check if a spec has any quality.
* @private
*/
function isQuality(spec) {
return spec.q > 0;
}