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zzz
90 lines
3.2 KiB
Java
90 lines
3.2 KiB
Java
package net.i2p.servlet.util;
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/**
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* Simple utilities for servlets.
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* Consolidated from i2psnark, susimail, and routerconsole
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* @since 0.9.33
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*/
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public class ServletUtil {
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private ServletUtil() {};
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/**
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* @param ua User-Agent string, non-null
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* @return true if a text-mode or mobile browser
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*/
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public static boolean isSmallBrowser(String ua) {
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return isTextBrowser(ua) || isMobileBrowser(ua);
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}
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/**
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* @param ua User-Agent string, non-null
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* @return true if a text-mode browser
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*/
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public static boolean isTextBrowser(String ua) {
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return
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ua.startsWith("Lynx") || ua.startsWith("w3m") ||
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ua.startsWith("ELinks") || ua.startsWith("Links") ||
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ua.startsWith("Dillo") || ua.startsWith("Emacs-w3m");
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}
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/**
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* The intent here is to return true for phones but
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* false for big tablets? But not consistent.
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*
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* @param ua User-Agent string, non-null
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* @return true if a mobile browser
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*/
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public static boolean isMobileBrowser(String ua) {
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return
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// http://www.zytrax.com/tech/web/mobile_ids.html
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// Android tablet UAs don't have "Mobile" in them
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(ua.contains("Android") && ua.contains("Mobile")) ||
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ua.contains("BlackBerry") ||
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ua.contains("iPhone") ||
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ua.contains("iPod") || ua.contains("iPad") ||
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ua.contains("Kindle") || ua.contains("Mobile") ||
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ua.contains("Nintendo") ||
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ua.contains("Opera Mini") || ua.contains("Opera Mobi") ||
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ua.contains("Palm") ||
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ua.contains("PLAYSTATION") || ua.contains("Playstation") ||
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ua.contains("Profile/MIDP-") || ua.contains("SymbianOS") ||
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ua.contains("Windows CE") || ua.contains("Windows Phone") ||
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ua.startsWith("DoCoMo") ||
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ua.startsWith("Cricket") || ua.startsWith("HTC") ||
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ua.startsWith("J-PHONE") || ua.startsWith("KDDI-") ||
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ua.startsWith("LG-") || ua.startsWith("LGE-") ||
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ua.startsWith("Nokia") || ua.startsWith("OPWV-SDK") ||
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ua.startsWith("MOT-") || ua.startsWith("SAMSUNG-") ||
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ua.startsWith("nook") || ua.startsWith("SCH-") ||
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ua.startsWith("SEC-") || ua.startsWith("SonyEricsson") ||
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ua.startsWith("Vodafone");
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}
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/**
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* Truncate a String.
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* Same as s.substring(0, len) except that
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* it won't split a surrogate pair or at a ZWJ.
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*
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* @param s non-null
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* @param len greater than zero
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* @return s if shorter; s.substring(0, len) if
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* the char at len-1 is not a high surrogate
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* or the char at len-1 or len is not a zero-width joiner;
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* s.substring(0, len+1 or len+2) if it is
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* @since 0.9.33
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*/
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public static String truncate(String s, int len) {
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if (s.length() <= len)
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return s;
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char c = s.charAt(len - 1);
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// https://en.wikipedia.org/wiki/Zero-width_joiner
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if (Character.isHighSurrogate(c) || c == 0x200D)
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return s.substring(0, len + 1);
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if (s.charAt(len) == 0x200D)
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return s.substring(0, len + 2);
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return s.substring(0, len);
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}
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}
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