package com.adobe.acs.commons.wcm.impl;
import com.adobe.acs.commons.util.BufferingResponse;
import com.adobe.granite.xss.XSSAPI;
import org.apache.commons.lang.StringUtils;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Reference;
import org.apache.sling.commons.osgi.PropertiesUtil;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Map;
@Component(
label = "ACS AEM Commons - AEM Environment Indicator",
description = "Adds a visual cue to the AEM WebUI indicating which environment is being access "
+ "(localdev, dev, qa, staging)",
metatype = true
)
public class AemEnvironmentIndicatorFilter implements Filter {
private static final Logger log = LoggerFactory.getLogger(AemEnvironmentIndicatorFilter.class);
private static final String DIV_ID = "acs-commons-env-indicator";
private static final String BASE_DEFAULT_STYLE = ";background-image:url('data:image/png;base64,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');"
+ "border-bottom: 1px solid rgba(0, 0, 0, .25);"
+ "box-sizing: border-box;"
+ "-moz-box-sizing: border-box;"
+ "-webkit-box-sizing: border-box;"
+ "position: fixed;"
+ "left: 0;"
+ "top: 0;"
+ "right: 0;"
+ "height: 5px;"
+ "z-index: 100000000000000;";
@Reference
private XSSAPI xss;
/* Property: Default Color */
private String color = "";
@Property(label = "Color",
description = "The color of the indicator bar; takes any valid value"
+ " for CSS's 'background-color' attribute."
+ " This is ignored if a Style Override is provided.",
value = "")
public static final String PROP_COLOR = "css-color";
/* Property: CSS Override */
private String cssOverride = "";
@Property(label = "CSS Override",
description = "Accepts any valid CSS to style the AEM indicator div. All CSS rules must only be "
+ "scoped to #" + DIV_ID + " { .. }",
value = "")
public static final String PROP_CSS_OVERRIDE = "css-override";
/* Property: Inner HTML */
private String innerHTML = "";
@Property(label = "Inner HTML",
description = "Any additional HTML required; Will be injected into a div with"
+ " id='" + DIV_ID + "'",
value = "")
public static final String PROP_INNER_HTML = "inner-html";
/* Property: Browser Title Prefix */
private static final String DEFAULT_TITLE_PREFIX = "";
private String titlePrefix = DEFAULT_TITLE_PREFIX;
@Property(label = "Browser Title",
description = "A prefix to add to the browser tab/window title; <THIS VALUE> | <ORIGINAL DOC TITLE>",
value = DEFAULT_TITLE_PREFIX)
public static final String PROP_TITLE_PREFIX = "browser-title-prefix";
private static final String[] REJECT_PATH_PREFIXES = new String[]{
};
private String css = "";
private ServiceRegistration filterRegistration;
@Override
public void init(final FilterConfig filterConfig) throws ServletException {
}
@Override
public final void doFilter(final ServletRequest servletRequest, final ServletResponse servletResponse,
final FilterChain filterChain) throws IOException, ServletException {
if (!(servletRequest instanceof HttpServletRequest)
|| !(servletResponse instanceof HttpServletResponse)) {
filterChain.doFilter(servletRequest, servletResponse);
return;
}
final HttpServletRequest request = (HttpServletRequest) servletRequest;
final HttpServletResponse response = (HttpServletResponse) servletResponse;
if (!this.accepts(request)) {
filterChain.doFilter(request, response);
return;
}
final BufferingResponse capturedResponse = new BufferingResponse(response);
filterChain.doFilter(request, capturedResponse);
// Get contents
final String contents = capturedResponse.getContents();
if (contents != null && StringUtils.contains(response.getContentType(), "html")) {
final int bodyIndex = contents.indexOf("</body>");
if (bodyIndex != -1) {
final PrintWriter printWriter = response.getWriter();
printWriter.write(contents.substring(0, bodyIndex));
if (StringUtils.isNotBlank(css)) {
printWriter.write("<style>" + css + " </style>");
printWriter.write("<div id=\"" + DIV_ID + "\">" + innerHTML + "</div>");
}
if (StringUtils.isNotBlank(titlePrefix)) {
printWriter.write("<script>document.title = '"
+ titlePrefix
+ " | ' + document.title;</script>");
}
printWriter.write(contents.substring(bodyIndex));
return;
}
}
if (contents != null) {
response.getWriter().write(contents);
}
}
@Override
public void destroy() {
}
private boolean accepts(final HttpServletRequest request) {
if (StringUtils.isBlank(css) && StringUtils.isBlank(titlePrefix)) {
// Only accept is properly configured
log.warn("AEM Environment Indicator is not properly configured; If this feature is unwanted, "
+ "remove the OSGi configuration and disable completely.");
return false;
} else if (!StringUtils.equalsIgnoreCase("get", request.getMethod())) {
// Only inject on GET requests
return false;
} else if (StringUtils.startsWithAny(request.getRequestURI(), REJECT_PATH_PREFIXES)) {
// Reject any request to well-known rejection-worthy path prefixes
return false;
} else if (StringUtils.equals(request.getHeader("X-Requested-With"), "XMLHttpRequest")) {
// Do not inject into XHR requests
return false;
} else if (StringUtils.endsWith(request.getHeader("Referer"), "/editor.html" + request.getRequestURI())) {
// Do not apply to pages loaded in the TouchUI editor.html
return false;
} else if (StringUtils.endsWith(request.getHeader("Referer"), "/cf")) {
// Do not apply to pages loaded in the Classic Content Finder
return false;
}
return true;
}
private String createCSS(final String providedColor) {
return "#" + DIV_ID + " { "
+ "background-color:" + providedColor + BASE_DEFAULT_STYLE
+ " }";
}
@Activate
protected final void activate(ComponentContext ctx) {
Dictionary<?, ?> config = ctx.getProperties();
color = PropertiesUtil.toString(config.get(PROP_COLOR), "");
cssOverride = PropertiesUtil.toString(config.get(PROP_CSS_OVERRIDE), "");
innerHTML = PropertiesUtil.toString(config.get(PROP_INNER_HTML), "");
// Only write CSS variable if cssOverride or color is provided
if (StringUtils.isNotBlank(cssOverride)) {
css = cssOverride;
} else if (StringUtils.isNotBlank(color)) {
css = createCSS(color);
}
titlePrefix = xss.encodeForJSString(
PropertiesUtil.toString(config.get(PROP_TITLE_PREFIX), "").toString());
if (StringUtils.isNotBlank(css) || StringUtils.isNotBlank(titlePrefix)) {
Dictionary<String, String> filterProps = new Hashtable<String, String>();
filterProps.put("pattern", ".*");
filterRegistration = ctx.getBundleContext().registerService(Filter.class.getName(), this, filterProps);
}
}
@Deactivate
protected final void deactivate(final Map<String, String> config) {
if (filterRegistration != null) {
filterRegistration.unregister();
filterRegistration = null;
}
// Reset CSS variable
css = "";
}
}