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Server-side integration for the FormKiQ ios application

There is a newer version: 0.6.1

package com.formkiq.server.api;

import java.util.logging.Logger;

import javax.servlet.http.HttpServletRequest;

import org.springframework.http.MediaType;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.util.StringUtils;

import com.formkiq.server.service.PreconditionFailedException;

import javassist.bytecode.stackmap.TypeData.ClassName;

/**
 * Abstract Rest Services controller.
 *
 */
public abstract class AbstractRestController {

    /** Valid Accept Header. */
    public static final MediaType ACCEPT_HEADER_V1
        = MediaType.valueOf("application/vnd.formkiq.v1+json");

    /** Logger. */
    protected static final Logger LOG = Logger.getLogger(ClassName.class
            .getName());

	/**
     * Converts Token to Int.
     * @param token {@link String}
     * @return int
     */
    protected int convertToken(final String token) {
        int next = -1;
        if (!StringUtils.isEmpty(token)) {
            try {
                next = Integer.parseInt(token);
            } catch (NumberFormatException e) {
                throw new PreconditionFailedException("invalid next token");
            }
        }
        return next;
    }

    /**
	 * @param request HttpServletRequest
     * @return int
     */
    protected int getApiVersion(final HttpServletRequest request) {
        String accept = request.getHeader("Accept");

        if (accept.equals(ACCEPT_HEADER_V1.toString())) {
            return 1;
        }

        throw new InvalidMediaTypeException(
                "invalid accept header, must be " + ACCEPT_HEADER_V1);
    }

    /**
     * @return Authentication
     */
    protected Authentication getAuthentication() {
        Authentication auth = SecurityContextHolder.getContext()
                .getAuthentication();
        return auth;
    }

    /**
     * @return UserDetails
     */
    protected UserDetails getUserDetails() {

        Authentication auth = SecurityContextHolder.getContext()
                .getAuthentication();
        if (auth instanceof OAuth2Authentication) {
            OAuth2Authentication oauth = (OAuth2Authentication) auth;
            return (UserDetails) oauth.getUserAuthentication().getPrincipal();
        }

        if (auth instanceof UsernamePasswordAuthenticationToken) {
            return (UserDetails) ((UsernamePasswordAuthenticationToken) auth)
                    .getPrincipal();
        }

        return null;
    }

}