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/*!
* express
* Copyright(c) 2009-2013 TJ Holowaychuk
* Copyright(c) 2014-2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict';
/**
* Module dependencies.
* @api private
*/
const querystring = require('querystring');
const { Buffer } = require('safe-buffer');
const contentType = require('content-type');
const { mime } = require('send');
const etag = require('etag');
const proxyaddr = require('proxy-addr');
const qs = require('qs');
let isHttp2Supported = true;
/**
* Test for http2 support
* @api private
*/
try {
require('http2');
} catch {
isHttp2Supported = false;
}
/**
* Return strong ETag for `body`.
*
* @param {String|Buffer} body
* @param {String} [encoding]
* @return {String}
* @api private
*/
exports.etag = createETagGenerator({ weak: false });
/**
* Return weak ETag for `body`.
*
* @param {String|Buffer} body
* @param {String} [encoding]
* @return {String}
* @api private
*/
exports.wetag = createETagGenerator({ weak: true });
/**
* Normalize the given `type`, for example "html" becomes "text/html".
*
* @param {String} type
* @return {Object}
* @api private
*/
exports.normalizeType = function (type) {
return ~type.indexOf('/')
? acceptParameters(type)
: { value: mime.lookup(type), params: {} };
};
/**
* Normalize `types`, for example "html" becomes "text/html".
*
* @param {Array} types
* @return {Array}
* @api private
*/
exports.normalizeTypes = function (types) {
const returnValue = [];
for (const element of types) {
returnValue.push(exports.normalizeType(element));
}
return returnValue;
};
/**
* Parse accept params `str` returning an
* object with `.value`, `.quality` and `.params`.
* also includes `.originalIndex` for stable sorting
*
* @param {String} str
* @return {Object}
* @api private
*/
function acceptParameters(string_, index) {
const parts = string_.split(/ *; */);
const returnValue = {
value: parts[0],
quality: 1,
params: {},
originalIndex: index
};
for (let i = 1; i < parts.length; ++i) {
const pms = parts[i].split(/ *= */);
if (pms[0] === 'q') {
returnValue.quality = Number.parseFloat(pms[1]);
} else {
returnValue.params[pms[0]] = pms[1];
}
}
return returnValue;
}
/**
* Compile "etag" value to function.
*
* @param {Boolean|String|Function} val
* @return {Function}
* @api private
*/
exports.compileETag = function (value) {
let fn;
if (typeof value === 'function') {
return value;
}
switch (value) {
case true:
fn = exports.wetag;
break;
case false:
break;
case 'strong':
fn = exports.etag;
break;
case 'weak':
fn = exports.wetag;
break;
default:
throw new TypeError('unknown value for etag function: ' + value);
}
return fn;
};
/**
* Compile "query parser" value to function.
*
* @param {String|Function} val
* @return {Function}
* @api private
*/
exports.compileQueryParser = function compileQueryParser(value) {
let fn;
if (typeof value === 'function') {
return value;
}
switch (value) {
case true:
fn = querystring.parse;
break;
case false:
break;
case 'extended':
fn = parseExtendedQueryString;
break;
case 'simple':
fn = querystring.parse;
break;
default:
throw new TypeError('unknown value for query parser function: ' + value);
}
return fn;
};
/**
* Compile "proxy trust" value to function.
*
* @param {Boolean|String|Number|Array|Function} val
* @return {Function}
* @api private
*/
exports.compileTrust = function (value) {
if (typeof value === 'function') return value;
if (value === true) {
// Support plain true/false
return function () {
return true;
};
}
if (typeof value === 'number') {
// Support trusting hop count
return function (a, i) {
return i < value;
};
}
if (typeof value === 'string') {
// Support comma-separated values
value = value.split(/ *, */);
}
return proxyaddr.compile(value || []);
};
/**
* Flag for http2 support
*/
exports.isHttp2Supported = isHttp2Supported;
/**
* Set the charset in a given Content-Type string.
*
* @param {String} type
* @param {String} charset
* @return {String}
* @api private
*/
exports.setCharset = function setCharset(type, charset) {
if (!type || !charset) {
return type;
}
// parse type
const parsed = contentType.parse(type);
// set charset
parsed.parameters.charset = charset;
// format type
return contentType.format(parsed);
};
/**
* Create an ETag generator function, generating ETags with
* the given options.
*
* @param {object} options
* @return {function}
* @private
*/
function createETagGenerator(options) {
return function generateETag(body, encoding) {
const buf = !Buffer.isBuffer(body) ? Buffer.from(body, encoding) : body;
return etag(buf, options);
};
}
/**
* Parse an extended query string with qs.
*
* @return {Object}
* @private
*/
function parseExtendedQueryString(string_) {
return qs.parse(string_, {
allowPrototypes: true
});
}
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