org.lognet.springboot.grpc.security.BasicAuthSchemeSelector Maven / Gradle / Ivy

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package org.lognet.springboot.grpc.security;

import java.util.Base64;
import java.util.Optional;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;

public class BasicAuthSchemeSelector implements AuthenticationSchemeSelector {

  private static final String prefix = "Basic ";

  @Override
  public Optional getAuthScheme(CharSequence authorization) {

    if (authorization.subSequence(0, prefix.length()).toString().equalsIgnoreCase(prefix)) {

      String token =
          new String(
              Base64.getDecoder()
                  .decode(
                      authorization
                          .subSequence(prefix.length(), authorization.length())
                          .toString()));
      int delim = token.indexOf(":");
      if (delim == -1) {
        throw new BadCredentialsException("Invalid basic authentication token");
      }
      return Optional.of(
          new UsernamePasswordAuthenticationToken(
              token.substring(0, delim), token.substring(delim + 1)));
    }
    return Optional.empty();
  }
}