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/*
* Android ownCloud News
*
* @author David Luhmer
* @copyright 2013 David Luhmer david-dev@live.de
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
package de.luhmer.owncloudnewsreader.helper;
import android.util.Log;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ImageHandler {
private static final String TAG = "[ImageHandler]";
private static final Pattern patternImg = Pattern.compile("<img[^>]*>");
private static final Pattern patternImgSrcLink = Pattern.compile("src=\"(.*?)\"");
public static List<String> getImageLinksFromText(String articleUrl, String text)
{
List<String> links = new ArrayList<>();
Matcher matcher = patternImg.matcher(text);
// Check all occurrences
while (matcher.find()) {
Matcher matcherSrcLink = patternImgSrcLink.matcher(matcher.group());
if(matcherSrcLink.find()) {
String link = matcherSrcLink.group(1);
if(link != null && link.startsWith("//")) { //Maybe the text contains image urls without http or https prefix.
link = "https:" + link;
}
// the android universal image loader doesn't support svg images. Therefore we don't want to load them through UIL
if(link.endsWith(".svg")) {
Log.d(TAG, "detected unsupported svg image in article: " + articleUrl + " -> " + link);
} else {
links.add(link);
}
}
}
return links;
}
public static String fixBrokenImageLinksInArticle(String articleUrl, String text)
{
Matcher matcher = patternImg.matcher(text);
// Check all occurrences
while (matcher.find()) {
Matcher matcherSrcLink = patternImgSrcLink.matcher(matcher.group());
if(matcherSrcLink.find()) {
String link = matcherSrcLink.group(1);
String originalLink = link;
String originalArticleUrl = articleUrl;
if(link != null) {
if(link.startsWith("//")) { //Maybe the text contains image urls without http or https prefix.
link = "https:" + link;
} else if (link.startsWith("/")) { // detected absolute url
try {
URI uri = new URI(articleUrl);
String domain = uri.getHost();
link = uri.getScheme() + "://" + domain + link;
} catch (URISyntaxException e) {
e.printStackTrace();
Log.e(TAG, e.toString());
}
} else {
// check if we have relative urls such as
// ./abc.jpeg or ./../abc.jpeg, ../abc.jpeg or ../../abc.jpeg
boolean linkNeedsHost = false;
if(link.startsWith("./")) {
link = link.substring(2); // remove ./ from link
linkNeedsHost = true;
}
// if link is relative without anything else in front (e.g. pix/wow.svg)
if(!link.startsWith("http") && !link.startsWith(".")) {
linkNeedsHost = true;
if(!articleUrl.endsWith("/")) {
// remove last part of article url to get a relative url
articleUrl = sliceLastPathOfUrl(articleUrl);
}
}
// in case the article url is of type articles/matrix-vs-xmpp.html we need to remove the file plus the first part of the url
if(link.startsWith("../") && !articleUrl.endsWith("/")) {
linkNeedsHost = true;
articleUrl = sliceLastPathOfUrl(articleUrl);
articleUrl = sliceLastPathOfUrl(articleUrl);
link = link.substring(3); // remove ../ from link
}
// if the article urls ends with an / we can just remove it piece by piece
while(link.startsWith("../")) {
linkNeedsHost = true;
articleUrl = sliceLastPathOfUrl(articleUrl);
link = link.substring(3); // remove ../ from link
}
if(linkNeedsHost) {
link = articleUrl + "/" + link;
}
}
}
if(!originalLink.equals(link)) {
Log.d(TAG, "Fixed link from: " + originalArticleUrl + " and " + originalLink + " -> " + link);
// text = text.replaceAll(originalLink, link); // this causes OutOfMemoryExceptions (https://github.com/nextcloud/news-android/issues/1055)
Pattern URL_PATTERN = Pattern.compile(originalLink);
Matcher urlMatcher = URL_PATTERN.matcher(text);
return urlMatcher.replaceAll(link);
}
}
}
return text;
}
private static String sliceLastPathOfUrl(String url) {
int idx = url.lastIndexOf("/");
int countOfSlashes = url.split("/").length - 1;
// Log.d(TAG, url + " " + countOfSlashes);
// make sure we don't count into the domain name (at least two slashes for ://)
if(idx > 0 && countOfSlashes > 2) {
return url.substring(0, idx);
} else {
return url;
}
}
public static void clearCache()
{
if(ImageLoader.getInstance().isInited()) {
ImageLoader.getInstance().clearDiskCache();
ImageLoader.getInstance().clearMemoryCache();
}
}
}
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