package railo.commons.lang;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import railo.commons.net.HTTPUtil;
import railo.transformer.util.CFMLString;
/**
* HTML Util class
*
*/
public final class HTMLUtil {
private final Tag[] tags=new Tag[]{
new Tag("a","href"),
new Tag("link","href"),
new Tag("form","action"),
new Tag("applet","code"),
new Tag("script","src"),
new Tag("body","background"),
new Tag("frame","src"),
new Tag("bgsound","src"),
new Tag("img","src"),
new Tag("embed",new String[]{"src","pluginspace"}),
new Tag("object",new String[]{"data","classid","codebase","usemap"})
};
/**
* returns all urls in a html String
* @param html HTML String to search urls
* @param url Absolute URL path to set
* @return urls found in html String
*/
public List getURLS(String html, URL url) {
ArrayList urls=new ArrayList();
CFMLString cfml=new CFMLString(html,"UTF-8");
while(!cfml.isAfterLast()) {
if(cfml.forwardIfCurrent('<')) {
for(int i=0;i<tags.length;i++) {
if(cfml.forwardIfCurrent(tags[i].tag+" ")) {
getSingleUrl(urls,cfml,tags[i],url);
}
}
}
else {
cfml.next();
}
}
return urls;
}
/**
* transform a single tag
* @param urls all urls founded
* @param cfml CFMl String Object containing plain HTML
* @param tag current tag totransform
* @param url absolute URL to Set at tag attribute
*/
private void getSingleUrl(List urls,CFMLString cfml, Tag tag,URL url) {
char quote=0;
boolean inside=false;
StringBuilder value=new StringBuilder();
while(!cfml.isAfterLast()) {
if(inside) {
if(quote!=0 && cfml.forwardIfCurrent(quote)) {
inside=false;
add(urls,url,value.toString());
}
else if(quote==0 && (cfml.isCurrent(' ')||cfml.isCurrent("/>")||cfml.isCurrent('>')||cfml.isCurrent('\t')||cfml.isCurrent('\n'))) {
inside=false;
try {
urls.add(new URL(url,value.toString()));
} catch (MalformedURLException e) {}
cfml.next();
}
else {
value.append(cfml.getCurrent());
cfml.next();
}
}
else if(cfml.forwardIfCurrent('>')) {
break;
}
else {
for(int i=0;i<tag.attributes.length;i++) {
if(cfml.forwardIfCurrent(tag.attributes[i])) {
cfml.removeSpace();
// =
if(cfml.isCurrent('=')) {
inside=true;
cfml.next();
cfml.removeSpace();
quote=cfml.getCurrent();
value=new StringBuilder();
if(quote!='"' && quote!='\'')quote=0;
else {
cfml.next();
}
}
}
}
if(!inside) {
cfml.next();
}
}
}
}
private void add(List list,URL baseURL,String value) {
value=value.trim();
String lcValue=value.toLowerCase();
try {
if(lcValue.startsWith("http://") || lcValue.startsWith("news://") || lcValue.startsWith("goopher://") || lcValue.startsWith("javascript:"))
list.add(HTTPUtil.toURL(value,true));
else {
list.add(new URL(baseURL,value.toString()));
}
}
catch(MalformedURLException mue) {}
//print.err(list.get(list.size()-1));
}
private class Tag {
private String tag;
private String[] attributes;
private Tag(String tag,String[] attributes) {
this.tag=tag.toLowerCase();
this.attributes=new String[attributes.length];
for(int i=0;i<attributes.length;i++) {
this.attributes[i]=attributes[i].toLowerCase();
}
}
private Tag(String tag,String attribute1) {
this.tag=tag.toLowerCase();
this.attributes=new String[]{attribute1.toLowerCase()};
}
}
}