fruitstand
Version:
112 lines (94 loc) • 2.14 kB
JavaScript
/**
* Module dependencies.
*/
var mime = require('send').mime;
var crc32 = require('buffer-crc32');
/**
* Return ETag for `body`.
*
* @param {String|Buffer} body
* @return {String}
* @api private
*/
exports.etag = function(body){
return '"' + crc32.signed(body) + '"';
};
/**
* Check if `path` looks absolute.
*
* @param {String} path
* @return {Boolean}
* @api private
*/
exports.isAbsolute = function(path){
if ('/' == path[0]) return true;
if (':' == path[1] && '\\' == path[2]) return true;
if ('\\\\' == path.substring(0, 2)) return true; // Microsoft Azure absolute path
};
/**
* Flatten the given `arr`.
*
* @param {Array} arr
* @return {Array}
* @api private
*/
exports.flatten = function(arr, ret){
ret = ret || [];
var len = arr.length;
for (var i = 0; i < len; ++i) {
if (Array.isArray(arr[i])) {
exports.flatten(arr[i], ret);
} else {
ret.push(arr[i]);
}
}
return ret;
};
/**
* Normalize the given `type`, for example "html" becomes "text/html".
*
* @param {String} type
* @return {Object}
* @api private
*/
exports.normalizeType = function(type){
return ~type.indexOf('/')
? acceptParams(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){
var ret = [];
for (var i = 0; i < types.length; ++i) {
ret.push(exports.normalizeType(types[i]));
}
return ret;
};
/**
* 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 acceptParams(str, index) {
var parts = str.split(/ *; */);
var ret = { value: parts[0], quality: 1, params: {}, originalIndex: index };
for (var i = 1; i < parts.length; ++i) {
var pms = parts[i].split(/ *= */);
if ('q' == pms[0]) {
ret.quality = parseFloat(pms[1]);
} else {
ret.params[pms[0]] = pms[1];
}
}
return ret;
}