1 files changed, 161 insertions, 0 deletions
diff --git a/mobile/android/services/src/main/java/org/mozilla/gecko/sync/setup/activities/WebURLFinder.java b/mobile/android/services/src/main/java/org/mozilla/gecko/sync/setup/activities/WebURLFinder.java
new file mode 100644
index 000000000..8411d2a62
--- /dev/null
+++ b/mobile/android/services/src/main/java/org/mozilla/gecko/sync/setup/activities/WebURLFinder.java
@@ -0,0 +1,161 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.sync.setup.activities;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class WebURLFinder {
+  /**
+   * These regular expressions are taken from Android's Patterns.java.
+   * We brought them in to standardize URL matching across Android versions, instead of relying
+   * on Android version-dependent built-ins that can vary across Android versions.
+   * The original code can be found here:
+   * http://androidxref.com/6.0.1_r10/xref/frameworks/base/core/java/android/util/Patterns.java
+   *
+   */
+  public static final String GOOD_IRI_CHAR = "a-zA-Z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF";
+  public static final String GOOD_GTLD_CHAR = "a-zA-Z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF";
+  public static final String IRI = "[" + GOOD_IRI_CHAR + "]([" + GOOD_IRI_CHAR + "\\-]{0,61}[" + GOOD_IRI_CHAR + "]){0,1}";
+  public static final String GTLD = "[" + GOOD_GTLD_CHAR + "]{2,63}";
+  public static final String HOST_NAME = "(" + IRI + "\\.)+" + GTLD;
+  public static final Pattern IP_ADDRESS = Pattern.compile("((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9])\\.(25[0-5]|2[0-4]"
+          + "[0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]"
+          + "[0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}"
+          + "|[1-9][0-9]|[0-9]))");
+  public static final Pattern DOMAIN_NAME = Pattern.compile("(" + HOST_NAME + "|" + IP_ADDRESS + ")");
+  public static final Pattern WEB_URL = Pattern.compile("((?:(http|https|Http|Https|rtsp|Rtsp):\\/\\/(?:(?:[a-zA-Z0-9\\$\\-\\_\\.\\+\\!\\*\\'\\(\\)"
+          + "\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,64}(?:\\:(?:[a-zA-Z0-9\\$\\-\\_"
+          + "\\.\\+\\!\\*\\'\\(\\)\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,25})?\\@)?)?"
+          + "(?:" + DOMAIN_NAME + ")"
+          + "(?:\\:\\d{1,5})?)"
+          + "(\\/(?:(?:[" + GOOD_IRI_CHAR + "\\;\\/\\?\\:\\@\\&\\=\\#\\~"
+          + "\\-\\.\\+\\!\\*\\'\\(\\)\\,\\_])|(?:\\%[a-fA-F0-9]{2}))*)?"
+          + "(?:\\b|$)");
+
+  public final List<String> candidates;
+
+  public WebURLFinder(String string) {
+    if (string == null) {
+      throw new IllegalArgumentException("string must not be null");
+    }
+
+    this.candidates = candidateWebURLs(string);
+  }
+
+  public WebURLFinder(List<String> strings) {
+    if (strings == null) {
+      throw new IllegalArgumentException("strings must not be null");
+    }
+
+    this.candidates = candidateWebURLs(strings);
+  }
+
+  /**
+   * Check if string is a Web URL.
+   * <p>
+   * A Web URL is a URI that is not a <code>file:</code> or
+   * <code>javascript:</code> scheme.
+   *
+   * @param string
+   *          to check.
+   * @return <code>true</code> if <code>string</code> is a Web URL.
+   */
+  public static boolean isWebURL(String string) {
+    try {
+      new URI(string);
+    } catch (Exception e) {
+      return false;
+    }
+
+    if (android.webkit.URLUtil.isFileUrl(string) ||
+        android.webkit.URLUtil.isJavaScriptUrl(string)) {
+      return false;
+    }
+
+    return true;
+  }
+
+  /**
+   * Return best Web URL.
+   * <p>
+   * "Best" means a Web URL with a scheme, and failing that, a Web URL without a
+   * scheme.
+   *
+   * @return a Web URL or <code>null</code>.
+   */
+  public String bestWebURL() {
+    String firstWebURLWithScheme = firstWebURLWithScheme();
+    if (firstWebURLWithScheme != null) {
+      return firstWebURLWithScheme;
+    }
+
+    return firstWebURLWithoutScheme();
+  }
+
+  protected static List<String> candidateWebURLs(Collection<String> strings) {
+    List<String> candidates = new ArrayList<String>();
+
+    for (String string : strings) {
+      if (string == null) {
+        continue;
+      }
+
+      candidates.addAll(candidateWebURLs(string));
+    }
+
+    return candidates;
+  }
+
+  protected static List<String> candidateWebURLs(String string) {
+    Matcher matcher = WEB_URL.matcher(string);
+    List<String> matches = new LinkedList<String>();
+
+    while (matcher.find()) {
+      // Remove URLs with bad schemes.
+      if (!isWebURL(matcher.group())) {
+        continue;
+      }
+
+      // Remove parts of email addresses.
+      if (matcher.start() > 0 && (string.charAt(matcher.start() - 1) == '@')) {
+        continue;
+      }
+
+      matches.add(matcher.group());
+    }
+
+    return matches;
+  }
+
+  protected String firstWebURLWithScheme() {
+    for (String match : candidates) {
+      try {
+        if (new URI(match).getScheme() != null) {
+          return match;
+        }
+      } catch (URISyntaxException e) {
+        // Ignore: on to the next.
+        continue;
+      }
+    }
+
+    return null;
+  }
+
+  protected String firstWebURLWithoutScheme() {
+    if (!candidates.isEmpty()) {
+      return candidates.get(0);
+    }
+
+    return null;
+  }
+}