// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.chromecast.shell;
import android.util.Patterns;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class LogcatElision {
private static final String EMAIL_ELISION = "<EMAIL-ELIDED>";
private static final String URL_ELISION = "<WEBADDRESS-ELIDED>";
private static final String GOOD_IRI_CHAR = "a-zA-Z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF";
private 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]))");
private static final String IRI =
"[" + GOOD_IRI_CHAR + "]([" + GOOD_IRI_CHAR + "\\-]{0,61}[" + GOOD_IRI_CHAR + "]){0,1}";
private static final String GOOD_GTLD_CHAR = "a-zA-Z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF";
private static final String GTLD = "[" + GOOD_GTLD_CHAR + "]{2,63}";
private static final String HOST_NAME = "(" + IRI + "\\.)+" + GTLD;
private static final Pattern DOMAIN_NAME =
Pattern.compile("(" + HOST_NAME + "|" + IP_ADDRESS + ")");
private static final Pattern WEB_URL =
Pattern.compile("(?:\\b|^)((?:(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|$)");
private static final String IP_ELISION = "<IP-ELIDED>";
private static final String MAC_ELISION = "<MAC-ELIDED>";
private static final String CONSOLE_ELISION = "[ELIDED:CONSOLE(0)] ELIDED CONSOLE MESSAGE";
private static final Pattern MAC_ADDRESS =
Pattern.compile("([0-9a-fA-F]{2}[-:]+){5}[0-9a-fA-F]{2}");
private static final Pattern CONSOLE_MSG = Pattern.compile("\\[\\w*:CONSOLE.*\\].*");
private static final String[] CHROME_NAMESPACE = new String[] {"org.chromium.", "com.google."};
private static final String[] CAST_NAMESPACE = new String[] {"Cast.", "CastV2."};
private static final String[] SYSTEM_NAMESPACE = new String[] {"android.accessibilityservice",
"android.accounts", "android.animation", "android.annotation", "android.app",
"android.appwidget", "android.bluetooth", "android.content", "android.database",
"android.databinding", "android.drm", "android.gesture", "android.graphics",
"android.hardware", "android.inputmethodservice", "android.location", "android.media",
"android.mtp", "android.net", "android.nfc", "android.opengl", "android.os",
"android.preference", "android.print", "android.printservice", "android.provider",
"android.renderscript", "android.sax", "android.security", "android.service",
"android.speech", "android.support", "android.system", "android.telecom",
"android.telephony", "android.test", "android.text", "android.transition",
"android.util", "android.view", "android.webkit", "android.widget", "com.android.",
"dalvik.", "java.", "javax.", "org.apache.", "org.json.", "org.w3c.dom.", "org.xml.",
"org.xmlpull."};
private static final Pattern JAVA_FILE = Pattern.compile(".java:[0-9]+$");
private static final String[] LOG_SPAM = new String[] {"persist.mtk.mlog2logcat", "MLOG_KERN"};
/**
* Elides any emails in the specified {@link String} with {@link
* #EMAIL_ELISION}.
*
* @param original String potentially containing emails.
* @return String with elided emails.
*/
private static String elideEmail(String original) {
return Patterns.EMAIL_ADDRESS.matcher(original).replaceAll(EMAIL_ELISION);
}
/**
* Elides any URLs in the specified {@link String} with
* {@link #URL_ELISION}.
*
* @param original String potentially containing URLs.
* @return String with elided URLs.
*/
private static String elideUrl(String original) {
StringBuilder buffer = new StringBuilder(original);
Matcher matcher = WEB_URL.matcher(buffer);
int start = 0;
while (matcher.find(start)) {
start = matcher.start();
int end = matcher.end();
String url = buffer.substring(start, end);
if (!likelyToBeChromeNamespace(url) && !likelyToBeSystemNamespace(url)
&& !likelyToBeCastNamespace(url) && !likelyToBeJavaFile(url)) {
buffer.replace(start, end, URL_ELISION);
end = start + URL_ELISION.length();
matcher = WEB_URL.matcher(buffer);
}
start = end;
}
return buffer.toString();
}
private static boolean likelyToBeChromeNamespace(String url) {
for (String ns : CHROME_NAMESPACE) {
if (url.startsWith(ns)) {
return true;
}
}
return false;
}
private static boolean likelyToBeSystemNamespace(String url) {
for (String ns : SYSTEM_NAMESPACE) {
if (url.startsWith(ns)) {
return true;
}
}
return false;
}
private static boolean likelyToBeCastNamespace(String url) {
for (String ns : CAST_NAMESPACE) {
if (url.startsWith(ns)) {
return true;
}
}
return false;
}
private static boolean likelyToBeLogSpam(String logline) {
for (String spam : LOG_SPAM) {
if (logline.contains(spam)) {
return true;
}
}
return false;
}
public static boolean likelyToBeJavaFile(String url) {
return JAVA_FILE.matcher(url).find();
}
/**
* Elides any IP addresses in the specified {@link String} with {@link
* #IP_ELISION}.
*
* @param original String potentially containing IPs.
* @return String with elided IPs.
*/
private static String elideIp(String original) {
return Patterns.IP_ADDRESS.matcher(original).replaceAll(IP_ELISION);
}
/**
* Elides any MAC addresses in the specified {@link String} with {@link
* #MAC_ELISION}.
*
* @param original String potentially containing MACs.
* @return String with elided MACs.
*/
private static String elideMac(String original) {
return MAC_ADDRESS.matcher(original).replaceAll(MAC_ELISION);
}
/**
* Elides any console messages in the specified {@link String} with {@link
* #CONSOLE_ELISION}.
*
* @param original String potentially containing console messages.
* @return String with elided console messages.
*/
private static String elideConsole(String original) {
return CONSOLE_MSG.matcher(original).replaceAll(CONSOLE_ELISION);
}
public static String elide(String ln) {
if (likelyToBeLogSpam(ln)) return "";
ln = elideEmail(ln);
ln = elideIp(ln);
ln = elideUrl(ln);
ln = elideMac(ln);
ln = elideConsole(ln);
return ln;
}
}
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