package org.apereo.cas.services.web;
import org.apache.commons.lang3.StringUtils;
import org.apereo.cas.authentication.principal.Service;
import org.apereo.cas.services.RegisteredService;
import org.apereo.cas.services.ServicesManager;
import org.apereo.cas.web.support.WebUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.web.servlet.theme.AbstractThemeResolver;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.execution.RequestContextHolder;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* ThemeResolver to determine the theme for CAS based on the service provided.
* The theme resolver will extract the service parameter from the Request object
* and attempt to match the URL provided to a Service Id. If the service is
* found, the theme associated with it will be used. If not, these is associated
* with the service or the service was not found, a default theme will be used.
*
* @author Scott Battaglia
* @since 3.0.0
*/
public class ServiceThemeResolver extends AbstractThemeResolver {
private static final Logger LOGGER = LoggerFactory.getLogger(ServiceThemeResolver.class);
private final ServicesManager servicesManager;
/**
* This sets a flag on the request called "isMobile" and also
* provides the custom flag called browserType which can be mapped into the theme.
* <p>
* Themes that understand isMobile should provide an alternative stylesheet.
*/
private final Map<Pattern, String> overrides;
public ServiceThemeResolver(final String defaultThemeName, final ServicesManager servicesManager, final Map<String, String> mobileOverrides) {
super();
super.setDefaultThemeName(defaultThemeName);
this.servicesManager = servicesManager;
this.overrides = mobileOverrides.entrySet().stream()
.collect(Collectors.toMap(entry -> Pattern.compile(entry.getKey()), Map.Entry::getValue));
}
@Override
public String resolveThemeName(final HttpServletRequest request) {
if (this.servicesManager == null) {
return getDefaultThemeName();
}
// retrieve the user agent string from the request
final String userAgent = WebUtils.getHttpServletRequestUserAgent(request);
if (StringUtils.isBlank(userAgent)) {
return getDefaultThemeName();
}
overrides.entrySet().stream()
.filter(entry -> entry.getKey().matcher(userAgent).matches())
.findFirst()
.ifPresent(entry -> {
request.setAttribute("isMobile", "true");
request.setAttribute("browserType", entry.getValue());
});
final RequestContext context = RequestContextHolder.getRequestContext();
final Service service = WebUtils.getService(context);
if (service != null) {
final RegisteredService rService = this.servicesManager.findServiceBy(service);
if (rService != null && rService.getAccessStrategy().isServiceAccessAllowed()
&& StringUtils.isNotBlank(rService.getTheme())) {
LOGGER.debug("Service [{}] is configured to use a custom theme [{}]", rService, rService.getTheme());
final CasThemeResourceBundleMessageSource messageSource = new CasThemeResourceBundleMessageSource();
messageSource.setBasename(rService.getTheme());
if (messageSource.doGetBundle(rService.getTheme(), request.getLocale()) != null) {
LOGGER.debug("Found custom theme [{}] for service [{}]", rService.getTheme(), rService);
return rService.getTheme();
}
LOGGER.warn("Custom theme [{}] for service [{}] cannot be located. Falling back to default theme...",
rService.getTheme(), rService);
}
}
return getDefaultThemeName();
}
@Override
public void setThemeName(final HttpServletRequest request, final HttpServletResponse response, final String themeName) {
// nothing to do here
}
private static class CasThemeResourceBundleMessageSource extends ResourceBundleMessageSource {
@Override
protected ResourceBundle doGetBundle(final String basename, final Locale locale) {
try {
final ResourceBundle bundle = ResourceBundle.getBundle(basename, locale, getBundleClassLoader());
if (bundle != null && !bundle.keySet().isEmpty()) {
return bundle;
}
} catch (final Exception e) {
LOGGER.debug(e.getMessage(), e);
}
return null;
}
}
}