package app.helpers; import org.apache.commons.lang.StringUtils; import com.auth0.jwt.JWT; import com.auth0.jwt.interfaces.DecodedJWT; public class TokenCheck { public static boolean isValidJWT(String jwt) { if (StringUtils.countMatches(jwt, ".") != 2) { return false; } jwt=jwt.trim(); if(StringUtils.contains(jwt," ")){ return false; } String[] sArray=StringUtils.split(jwt,"."); if(sArray.length < 3){ return false; } for(String value:sArray){ if(!value.matches("[A-Za-z0-9+/=_-]+")){ return false; } } try { DecodedJWT decoded = JWT.decode(jwt); decoded.getAlgorithm(); return true; } catch (Exception exception) {} return false; } }