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var minimatch = require("minimatch");
var utils     = exports;

utils.applyRules = function overwriteBody (rules, body, req, res) {
    return rules.reduce(function (body, rule) {
        /**
         * Try to use the replace string/fn first
         */
        if (rule.replace || typeof rule.replace === "string") {
            rule.fn = rule.replace;
        }
        if (typeof rule.fn === 'string') {
            return body.replace(rule.match, rule.fn);
        }
        return body.replace(rule.match, function () {
            var args = Array.prototype.slice.call(arguments);
            if (typeof rule.fn === 'function') {
        	    return rule.fn.apply(this, [req, res].concat(args))
            }
            return rule.fn;
        });
    }, body);
};

/**
 * Extensions that will be ignored by default
 * @type {Array}
 */
utils.defaultIgnoreTypes = [
    // text files
    "js", "json", "css",
    // image files
    "png", "jpg", "jpeg", "gif", "ico", "tif", "tiff", "bmp", "webp", "psd",
    // vector & font
    "svg", "woff", "ttf", "otf", "eot", "eps", "ps", "ai",
    // audio
    "mp3", "wav", "aac", "m4a", "m3u", "mid", "wma",
    // video & other media
    "mpg", "mpeg", "mp4", "m4v", "webm", "swf", "flv", "avi", "mov", "wmv",
    // document files
    "pdf", "doc", "docx", "xls", "xlsx", "pps", "ppt", "pptx", "odt", "ods", "odp", "pages", "key", "rtf", "txt", "csv",
    // data files
    "zip", "rar", "tar", "gz", "xml", "app", "exe", "jar", "dmg", "pkg", "iso"
].map(function (ext) {
        return "\\." + ext + "(\\?.*)?$";
    });

/**
 * Check if a URL was white-listed
 * @param url
 * @param whitelist
 * @returns {boolean}
 */
utils.isWhitelisted = function isWhitelisted(url, whitelist) {

    if (whitelist.indexOf(url) > -1) {
        return true;
    }

    return whitelist.some(function (pattern) {
        return minimatch(url, pattern);
    });
};

/**
 * Check if a URL was white-listed with single path
 * @param url
 * @param rules
 * @returns {Array}
 */
utils.isWhiteListedForSingle = function isWhiteListedForSingle(url, rules) {

    return rules.filter(function (item) {
        return item.paths && utils.isWhitelisted(url, utils.toArray(item.paths));
    });
};

/**
 * Determine if a response should be overwritten
 * @param {String} url
 * @param {Object} opts
 * @returns {boolean}
 */
utils.inBlackList = function inBlackList(url, opts) {

    // First check for an exact match
    if (!url || opts.blacklist.indexOf(url) > -1) {
        return true;
    }

    if (url.length === 1 && url === "/") {
        return false;
    }

    // Check the path only
    var split = url.split('?')[0];

    // second, check that the URL does not contain a
    // file extension that should be ignored by default
    if (opts.ignore.some(function (pattern) {
            return new RegExp(pattern).test(split);
        })) {
        return true;
    }

    // Finally, check any mini-match patterns for paths that have been excluded
    if (opts.blacklist.some(function (pattern) {
            return minimatch(url, pattern);
        })) {
        return true;
    }

    return false;
};

/**
 * @param req
 * @returns {Boolean}
 */
utils.hasAcceptHeaders = function hasAcceptHeaders(req) {
    var acceptHeader = req.headers["accept"];
    if (!acceptHeader) {
        return false;
    }
    return acceptHeader.indexOf("html") > -1;
};

/**
 * @param body
 * @returns {boolean}
 */
utils.snip = function snip(body) {
    if (!body) {
        return false;
    }
};

utils.toArray = function toArray(item) {
    if (!item) {
        return item;
    }
    if (!Array.isArray(item)) {
        return [item];
    }
    return item;
};

utils.isHtml = function isHtml(str) {
    if (!str) {
        return false;
    }
    // Test to see if start of file contents matches:
    // - Optional byte-order mark (BOM)
    // - Zero or more spaces
    // - Any sort of HTML tag, comment, or doctype tag (basically, <...>)
    return /^(\uFEFF|\uFFFE)?\s*<[^>]+>/i.test(str);
};