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<h1>
<a href="../../index.html">all files</a> / <a href="index.html">modules/headers/</a> AcceptEncoding.js
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<span class="strong">90.63% </span>
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<span class="strong">83.33% </span>
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<span class="strong">100% </span>
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<span class="strong">90.63% </span>
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<span class='fraction'>29/32</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">const parseMediaValue = require("../utils/parseMediaValue");
const parseMediaValues = require("../utils/parseMediaValues");
const qualityFactorForMediaValue = require("../utils/qualityFactorForMediaValue");
const stringifyMediaValues = require("../utils/stringifyMediaValues");
const Header = require("../Header");
const R = require("ramda");
function byHighestPrecedence(a, b) {
// "*" gets least precedence, all others are equal
let precedence;
<span class="missing-if-branch" title="if path not taken" >I</span>if (a === "*") {
<span class="cstat-no" title="statement not covered" > precedence = -1;</span>
} else <span class="missing-if-branch" title="if path not taken" >I</span>if (b === "*") {
<span class="cstat-no" title="statement not covered" > precedence = 1;</span>
} else {
precedence = 0;
}
return precedence;
}
/**
* Represents an HTTP Accept-Encoding header and provides several methods
* for determining acceptable content encodings.
*
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3
*/
class AcceptEncoding extends Header {
constructor(value) {
super("Accept-Encoding", value);
}
/**
* Returns the value of this header as a string.
*/
get value() {
return stringifyMediaValues(this._mediaValues) || "";
}
set value(value) {
this._mediaValues = value ? parseMediaValues(value) : [];
}
/**
* Returns true if the given encoding is acceptable.
*/
accepts(encoding) {
return this.qualityFactorForEncoding(encoding) !== 0;
}
/**
* Returns the quality factor for the given encoding.
*/
qualityFactorForEncoding(encoding) {
const values = this._mediaValues;
const givenValue = parseMediaValue(encoding);
const matchingValues = values.filter(function (value) {
if (value.type === "*") {
return true;
}
return value.type === givenValue.type;
}).sort(byHighestPrecedence);
// From RFC 2616:
// The "identity" content-coding is always acceptable, unless
// specifically refused because the Accept-Encoding field includes
// "identity;q=0", or because the field includes "*;q=0" and does
// not explicitly include the "identity" content-coding. If the
// Accept-Encoding field-value is empty, then only the "identity"
// encoding is acceptable.
if (givenValue.type === "identity") {
<span class="missing-if-branch" title="if path not taken" >I</span>if (matchingValues.length && matchingValues[0].type === "identity") {
<span class="cstat-no" title="statement not covered" > return qualityFactorForMediaValue(matchingValues[0]);</span>
}
return 1;
}
if (R.isEmpty(matchingValues)) {
return 0;
}
return qualityFactorForMediaValue(matchingValues[0]);
}
}
module.exports = AcceptEncoding;
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