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/*
* The MIT License
*
* Copyright (c) 2009-2023 PrimeTek Informatics
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.primefaces.component.avatar;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.LangUtils;
import org.primefaces.util.SharedStringBuilder;
public class AvatarRenderer extends CoreRenderer {
private static final Pattern LETTER_PATTTERN = Pattern.compile("\\b[\\p{L}\\p{M}]", Pattern.UNICODE_CHARACTER_CLASS);
private static final String GRAVATAR_URL = "https://www.gravatar.com/avatar/";
private static final String SB_AVATAR = AvatarRenderer.class.getName() + "#avatar";
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
Avatar avatar = (Avatar) component;
ResponseWriter writer = context.getResponseWriter();
String styleClass = getStyleClassBuilder(context)
.add(Avatar.STYLE_CLASS)
.add(avatar.getStyleClass())
.add("circle".equals(avatar.getShape()), Avatar.CIRCLE_CLASS)
.add("large".equals(avatar.getSize()), Avatar.SIZE_LARGE_CLASS)
.add("xlarge".equals(avatar.getSize()), Avatar.SIZE_XLARGE_CLASS)
.add(avatar.isDynamicColor(), Avatar.DYNAMIC_COLOR_CLASS)
.add(avatar.isDynamicColor(), avatar.getLightness() > 50
? Avatar.DYNAMIC_COLOR_LIGHT_CLASS : Avatar.DYNAMIC_COLOR_DARK_CLASS)
.build();
writer.startElement("div", null);
writer.writeAttribute("id", avatar.getClientId(context), "id");
writer.writeAttribute("class", styleClass, "styleClass");
String label = calculateLabel(context, avatar);
String style = avatar.getStyle();
String title = avatar.getTitle();
if (avatar.isDynamicColor() && label != null) {
String colorCss = generateBackgroundColor(avatar);
style = style == null ? colorCss : colorCss + style;
}
if (style != null) {
writer.writeAttribute("style", style, "style");
}
if (!LangUtils.isEmpty(title)) {
writer.writeAttribute("title", title, null);
}
encodeDefaultContent(context, avatar, label);
renderChildren(context, avatar);
writer.endElement("div");
}
protected void encodeDefaultContent(FacesContext context, Avatar avatar, String label) throws IOException {
ResponseWriter writer = context.getResponseWriter();
if (avatar.getGravatar() != null) {
writer.startElement("img", null);
writer.writeAttribute("src", generateGravatar(context, avatar), "src");
writer.endElement("img");
}
if (LangUtils.isNotBlank(label)) {
writer.startElement("span", null);
writer.writeAttribute("class", Avatar.SIZE_TEXT_CLASS, "styleClass");
writer.writeText(label, "label");
writer.endElement("span");
}
else if (avatar.getIcon() != null) {
String iconStyleClass = getStyleClassBuilder(context)
.add(Avatar.ICON_CLASS)
.add(avatar.getIcon())
.build();
writer.startElement("span", null);
writer.writeAttribute("class", iconStyleClass, "styleClass");
writer.endElement("span");
}
}
@Override
public void encodeChildren(FacesContext context, UIComponent component) throws IOException {
//Do nothing
}
@Override
public boolean getRendersChildren() {
return true;
}
/**
* Generates a label based on the text if its more than 2 characters. Example: PrimeFaces Rocks = PR
*
* @param avatar the Avatar component
* @return the calculated label text.
*/
protected String calculateLabel(FacesContext context, Avatar avatar) {
String value = avatar.getLabel();
if (value == null || value.length() <= 2) {
return value;
}
Matcher m = LETTER_PATTTERN.matcher(value);
StringBuilder sb = SharedStringBuilder.get(context, SB_AVATAR);
while (m.find()) {
sb.append(m.group());
}
String initials = sb.toString();
initials = LangUtils.isEmpty(initials) ? value.charAt(0) + "" : initials;
return initials.length() == 1 ? initials : initials.charAt(0) + initials.substring(initials.length() - 1);
}
/**
* Generates a dynamic color based on the hash of the label.
*
* @param avatar to generate the color for
* @return the new color and background color styles
*/
protected String generateBackgroundColor(Avatar avatar) {
return String.format(
"background-color:hsla(%d,%d%%,%d%%,%d%%)",
Math.abs((avatar.getLabel().hashCode() % 40) * 9),
avatar.getSaturation(),
avatar.getLightness(),
avatar.getAlpha()
);
}
/**
* Generate a Gravatar URL for an email addressed based on API docs.
*
* @see Image Requests
* @param context the Face
* @param avatar the Avatar to create a Gravatar for
* @return the URL to retrieve the Gravatar image
*/
protected String generateGravatar(FacesContext context, Avatar avatar) {
String email = avatar.getGravatar();
String config = avatar.getGravatarConfig();
if (LangUtils.isBlank(config) && avatar.canFallback()) {
config = "d=blank";
}
String url;
try {
StringBuilder sb = SharedStringBuilder.get(context, SB_AVATAR);
sb.append(GRAVATAR_URL);
generateMailHash(sb, email);
if (LangUtils.isNotBlank(config)) {
sb.append('?').append(config);
}
url = sb.toString();
}
catch (NoSuchAlgorithmException e) {
throw new FacesException("Failed to generate Gravatar URL for value: " + email);
}
return url;
}
/**
* Converts email address into a hash code for Gravatar API.
*
* @param sb the Stringbuilder to add the email address to
* @param email the email to encode
* @throws NoSuchAlgorithmException if hash can't be encoded
*/
protected void generateMailHash(StringBuilder sb, String email) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("MD5"); // NOSONAR
md.update(email.getBytes(StandardCharsets.UTF_8));
byte[] digest = md.digest();
for (byte b : digest) {
sb.append(String.format("%02x", b & 0xff));
}
}
}
