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msd2/tracking/piwik/plugins/Overlay/client/urlnormalizer.js

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+/**
+ * URL NORMALIZER
+ * This utility preprocesses both the URLs in the document and
+ * from the Piwik logs in order to make matching possible.
+ */
+var Piwik_Overlay_UrlNormalizer = (function () {
+
+    /** Base href of the current document */
+    var baseHref = false;
+
+    /** Url of current folder */
+    var currentFolder;
+
+    /** The current domain */
+    var currentDomain;
+
+    /** Regular expressions for parameters to be excluded when matching links on the page */
+    var excludedParamsRegEx = [];
+
+    /**
+     * Basic normalizations for domain names
+     * - remove protocol and www from absolute urls
+     * - add a trailing slash to urls without a path
+     *
+     * Returns array
+     * 0: normalized url
+     * 1: true, if url was absolute (if not, no normalization was performed)
+     */
+    function normalizeDomain(url) {
+        if (url === null) {
+            return '';
+        }
+
+        var absolute = false;
+
+        // remove protocol
+        if (url.substring(0, 7) == 'http://') {
+            absolute = true;
+            url = url.substring(7, url.length);
+        } else if (url.substring(0, 8) == 'https://') {
+            absolute = true;
+            url = url.substring(8, url.length);
+        }
+
+        if (absolute) {
+            // remove www.
+            url = removeWww(url);
+
+            // add slash to domain names
+            if (url.indexOf('/') == -1) {
+                url += '/';
+            }
+        }
+
+        return [url, absolute];
+    }
+
+    /** Remove www. from a domain */
+    function removeWww(domain) {
+        if (domain.substring(0, 4) == 'www.') {
+            return domain.substring(4, domain.length);
+        }
+        return domain;
+    }
+
+    return {
+
+        initialize: function () {
+            this.setCurrentDomain(document.location.host);
+            this.setCurrentUrl(window.location.href);
+
+            var head = document.getElementsByTagName('head');
+            if (head.length) {
+                var base = head[0].getElementsByTagName('base');
+                if (base.length && base[0].href) {
+                    this.setBaseHref(base[0].href);
+                }
+            }
+        },
+
+        /**
+         * Explicitly set domain (for testing)
+         */
+        setCurrentDomain: function (pCurrentDomain) {
+            currentDomain = removeWww(pCurrentDomain);
+        },
+
+        /**
+         * Explicitly set current url (for testing)
+         */
+        setCurrentUrl: function (url) {
+            var index = url.lastIndexOf('/');
+            if (index != url.length - 1) {
+                currentFolder = url.substring(0, index + 1);
+            } else {
+                currentFolder = url;
+            }
+            currentFolder = normalizeDomain(currentFolder)[0];
+        },
+
+        /**
+         * Explicitly set base href (for testing)
+         */
+        setBaseHref: function (pBaseHref) {
+            if (!pBaseHref) {
+                baseHref = false;
+            } else {
+                baseHref = normalizeDomain(pBaseHref)[0];
+            }
+        },
+
+        /**
+         * Set the parameters to be excluded when matching links on the page
+         */
+        setExcludedParameters: function (pExcludedParams) {
+            excludedParamsRegEx = [];
+            for (var i = 0; i < pExcludedParams.length; i++) {
+                var paramString = pExcludedParams[i];
+                excludedParamsRegEx.push(new RegExp('&' + paramString + '=([^&#]*)', 'ig'));
+            }
+        },
+
+        /**
+         * Remove the protocol and the prefix of a URL
+         */
+        removeUrlPrefix: function (url) {
+            return normalizeDomain(url)[0];
+        },
+
+        /**
+         * Normalize URL
+         * Can be an absolute or a relative URL
+         */
+        normalize: function (url) {
+            if (!url) {
+                return '';
+            }
+
+            // ignore urls starting with #
+            if (url.substring(0, 1) == '#') {
+                return '';
+            }
+
+            // basic normalizations for absolute urls
+            var normalized = normalizeDomain(url);
+            url = normalized[0];
+
+            var absolute = normalized[1];
+
+            if (!absolute) {
+                /** relative url */
+                if (url.substring(0, 1) == '/') {
+                    // relative to domain root
+                    url = currentDomain + url;
+                } else if (baseHref) {
+                    // relative to base href
+                    url = baseHref + url;
+                } else {
+                    // relative to current folder
+                    url = currentFolder + url;
+                }
+            }
+
+            // replace multiple / with a single /
+            url = url.replace(/\/\/+/g, '/');
+
+            // handle ./ and ../
+            var parts = url.split('/');
+            var urlArr = [];
+            for (var i = 0; i < parts.length; i++) {
+                if (parts[i] == '.') {
+                    // ignore
+                }
+                else if (parts[i] == '..') {
+                    urlArr.pop();
+                }
+                else {
+                    urlArr.push(parts[i]);
+                }
+            }
+            url = urlArr.join('/');
+
+            // remove ignored parameters
+            url = url.replace(/\?/, '?&');
+            for (i = 0; i < excludedParamsRegEx.length; i++) {
+                var regEx = excludedParamsRegEx[i];
+                url = url.replace(regEx, '');
+            }
+            url = url.replace(/\?&/, '?');
+            url = url.replace(/\?#/, '#');
+            url = url.replace(/\?$/, '');
+            url = url.replace(/%5B/gi, '[');
+            url = url.replace(/%5D/gi, ']');
+
+            return url;
+        }
+
+    };
+
+})();