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gaia/shared/js/url_helper.js

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+'use strict';
+
+var rscheme = /^(?:[a-z\u00a1-\uffff0-9-+]+)(?::(?:\/\/)?)/i;
+
+var UrlHelper = {
+
+  // Placeholder anchor tag to format URLs.
+  a: null,
+
+  getUrlFromInput: function urlHelper_getUrlFromInput(input) {
+    this.a = this.a || document.createElement('a');
+    this.a.href = input;
+    return this.a.href;
+  },
+
+  _getScheme: function(input) {
+    // This function returns one of followings
+    // - scheme + ':' (ex. http:)
+    // - scheme + '://' (ex. http://)
+    // - null
+    return (rscheme.exec(input) || [])[0];
+  },
+
+  hasScheme: function(input) {
+    return !!this._getScheme(input);
+  },
+
+  isURL: function urlHelper_isURL(input) {
+    return !UrlHelper.isNotURL(input);
+  },
+
+  isNotURL: function urlHelper_isNotURL(input) {
+    // in bug 904731, we use <input type='url' value=''> to
+    // validate url. However, there're still some cases
+    // need extra validation. We'll remove it til bug fixed
+    // for native form validation.
+    //
+    // for cases, ?abc and "a? b" which should searching query
+    var case1Reg = /^(\?)|(\?.+\s)/;
+    // for cases, pure string
+    var case2Reg = /[\?\.\s\:]/;
+    // for cases, data:uri and view-source:uri
+    var case3Reg = /^(data|view-source)\:/;
+
+    var str = input.trim();
+    if (case1Reg.test(str) || !case2Reg.test(str) ||
+        this._getScheme(str) === str) {
+      return true;
+    }
+    if (case3Reg.test(str)) {
+      return false;
+    }
+    // require basic scheme before form validation
+    if (!this.hasScheme(str)) {
+      str = 'http://' + str;
+    }
+    if (!this.urlValidate) {
+      this.urlValidate = document.createElement('input');
+      this.urlValidate.setAttribute('type', 'url');
+    }
+    this.urlValidate.setAttribute('value', str);
+    return !this.urlValidate.validity.valid;
+  },
+
+  /**
+   * Resolve a URL against a base URL.
+   *
+   * @param url String URL to resolve.
+   * @param baseURL String Base URL to resolve against.
+   * @returns String resolved URL or null.
+   */
+  resolveUrl: function urlHelper_resolveURL(url, baseUrl) {
+    if (!url) {
+      return null;
+    }
+    try {
+      return new URL(url, baseUrl).href;
+    } catch(e) {
+      return null;
+    }
+  },
+
+  /**
+   * Get the hostname from a URL.
+   *
+   * @param String URL to process.
+   * @returns String hostname of URL.
+   */
+  getHostname: function urlHelper_getHostname(url) {
+    try {
+      return new URL(url).hostname;
+    } catch(e) {
+      return null;
+    }
+  }
+};