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/* Copyright 2017 Thomas Schneider
*
* This file is a part of Mastalab
*
* This program is free software; you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* Mastalab 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 General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along with Mastalab; if not,
* see <http://www.gnu.org/licenses>. */
package fr.gouv.etalab.mastodon.asynctasks;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Build;
import android.text.Html;
import android.util.Patterns;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import fr.gouv.etalab.mastodon.client.HttpsConnection;
import fr.gouv.etalab.mastodon.helper.Helper;
import fr.gouv.etalab.mastodon.interfaces.OnRetrieveMetaDataInterface;
/**
* Created by Thomas on 02/09/2017.
* Retrieves metadata of a remote page
*/
public class RetrieveMetaDataAsyncTask extends AsyncTask<Void, Void, Void> {
private OnRetrieveMetaDataInterface listener;
private String url;
private boolean error = false;
private String image, title, description, sharedSubject, sharedText;
private WeakReference<Context> contextWeakReference;
public RetrieveMetaDataAsyncTask(Context context, String sharedSubject, String sharedText,String url, OnRetrieveMetaDataInterface onRetrieveRemoteAccountInterface){
this.url = url;
this.listener = onRetrieveRemoteAccountInterface;
this.sharedText = sharedText;
this.sharedSubject = sharedSubject;
this.contextWeakReference = new WeakReference<>(context);
}
@Override
protected Void doInBackground(Void... params) {
String potentialUrl = "";
if (url == null) {
error = true;
return null;
}
try {
Matcher matcher;
if (url.startsWith("www."))
url = "http://" + url;
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT)
matcher = Patterns.WEB_URL.matcher(url);
else
matcher = Helper.urlPattern.matcher(url);
while (matcher.find()){
int matchStart = matcher.start(1);
int matchEnd = matcher.end();
if(matchStart < matchEnd && url.length() >= matchEnd)
potentialUrl = url.substring(matchStart, matchEnd);
}
// If we actually have a URL then make use of it.
if (potentialUrl.length() > 0) {
Pattern titlePattern = Pattern.compile("meta[ a-zA-Z=\"'-]+property=[\"']og:title[\"']\\s+content=[\"']([^>]*)[\"']");
Pattern descriptionPattern = Pattern.compile("meta[ a-zA-Z=\"'-]+property=[\"']og:description[\"']\\s+content=[\"']([^>]*)[\"']");
Pattern imagePattern = Pattern.compile("meta[ a-zA-Z=\"'-]+property=[\"']og:image[\"']\\s+content=[\"']([^>]*)[\"']");
try {
String response = new HttpsConnection(this.contextWeakReference.get()).get(potentialUrl);
Matcher matcherTitle = titlePattern.matcher(response);
Matcher matcherDescription = descriptionPattern.matcher(response);
Matcher matcherImage = imagePattern.matcher(response);
String titleEncoded = null;
String descriptionEncoded = null;
while (matcherTitle.find())
titleEncoded = matcherTitle.group(1);
while (matcherDescription.find())
descriptionEncoded = matcherDescription.group(1);
while (matcherImage.find())
image = matcherImage.group(1);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
if( titleEncoded != null)
title = Html.fromHtml(titleEncoded, Html.FROM_HTML_MODE_LEGACY).toString();
if( descriptionEncoded != null)
description = Html.fromHtml(descriptionEncoded, Html.FROM_HTML_MODE_LEGACY).toString();
}else {
//noinspection deprecation
if( titleEncoded != null)
title = Html.fromHtml(titleEncoded).toString();
if( descriptionEncoded != null)
description = Html.fromHtml(descriptionEncoded).toString();
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (KeyManagementException e) {
e.printStackTrace();
} catch (HttpsConnection.HttpsConnectionException e) {
e.printStackTrace();
}
}
} catch (IOException | IndexOutOfBoundsException e) {
error = true;
}
return null;
}
@Override
protected void onPostExecute(Void result) {
listener.onRetrieveMetaData(error, sharedSubject, sharedText, image, title, description);
}
}
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