mirror of https://github.com/M66B/FairEmail.git
671 lines
25 KiB
Java
671 lines
25 KiB
Java
package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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FairEmail is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2019 by Marcel Bokhorst (M66B)
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*/
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.content.res.Resources;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import android.graphics.drawable.LevelListDrawable;
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import android.os.Handler;
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import android.text.Html;
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import android.text.Spanned;
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import android.text.TextUtils;
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import android.util.Base64;
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import android.widget.TextView;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.core.text.HtmlCompat;
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import androidx.core.util.PatternsCompat;
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import androidx.preference.PreferenceManager;
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import org.jsoup.Jsoup;
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import org.jsoup.nodes.Attribute;
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import org.jsoup.nodes.Document;
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import org.jsoup.nodes.Element;
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import org.jsoup.nodes.Node;
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import org.jsoup.nodes.TextNode;
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import org.jsoup.safety.Cleaner;
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import org.jsoup.safety.Whitelist;
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import org.jsoup.select.NodeTraversor;
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import org.jsoup.select.NodeVisitor;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.URL;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import static androidx.core.text.HtmlCompat.FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM;
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import static androidx.core.text.HtmlCompat.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE;
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public class HtmlHelper {
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static final int PREVIEW_SIZE = 250;
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private static final int TRACKING_PIXEL_SURFACE = 25;
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private static final List<String> heads = Collections.unmodifiableList(Arrays.asList(
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"h1", "h2", "h3", "h4", "h5", "h6", "p", "ol", "ul", "table", "br", "hr"));
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private static final List<String> tails = Collections.unmodifiableList(Arrays.asList(
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"h1", "h2", "h3", "h4", "h5", "h6", "p", "ol", "ul", "li"));
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private static final ExecutorService executor = Executors.newSingleThreadExecutor(Helper.backgroundThreadFactory);
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static String sanitize(Context context, String html) {
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
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boolean paranoid = prefs.getBoolean("paranoid", true);
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Document parsed = Jsoup.parse(html);
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// <html xmlns:v="urn:schemas-microsoft-com:vml"
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// xmlns:o="urn:schemas-microsoft-com:office:office"
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// xmlns:w="urn:schemas-microsoft-com:office:word"
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// xmlns:m="http://schemas.microsoft.com/office/2004/12/omml"
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// xmlns="http://www.w3.org/TR/REC-html40">
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// <o:p> </o:p></span>
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// Default XHTML namespace: http://www.w3.org/1999/xhtml
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String ns = null;
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for (Element h : parsed.select("html"))
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for (Attribute a : h.attributes()) {
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String key = a.getKey();
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String value = a.getValue();
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if (value != null &&
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key.startsWith("xmlns:") &&
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value.startsWith("http://www.w3.org/")) {
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ns = key.split(":")[1];
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break;
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}
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}
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for (Element e : parsed.select("*")) {
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String tag = e.tagName();
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if (tag.contains(":")) {
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if (ns != null && tag.startsWith(ns)) {
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e.tagName(tag.split(":")[1]);
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Log.i("Updated tag=" + tag + " to=" + e.tagName());
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} else {
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e.remove();
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Log.i("Removed tag=" + tag);
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}
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}
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}
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Whitelist whitelist = Whitelist.relaxed()
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.addTags("hr", "abbr")
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.removeTags("col", "colgroup", "thead", "tbody")
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.removeAttributes("table", "width")
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.removeAttributes("td", "colspan", "rowspan", "width")
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.removeAttributes("th", "colspan", "rowspan", "width")
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.addProtocols("img", "src", "cid")
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.addProtocols("img", "src", "data");
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final Document document = new Cleaner(whitelist).clean(parsed);
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// Short quotes
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for (Element q : document.select("q")) {
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q.prependText("\"");
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q.appendText("\"");
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q.tagName("em");
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}
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// Pre formatted text
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for (Element code : document.select("pre")) {
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code.html(code.html().replaceAll("\\r?\\n", "<br />"));
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code.tagName("div");
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}
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// Code
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document.select("code").tagName("div");
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// Lines
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for (Element hr : document.select("hr")) {
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hr.tagName("div");
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hr.text("----------------------------------------");
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}
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// Descriptions
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document.select("dl").tagName("div");
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for (Element dt : document.select("dt")) {
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dt.tagName("strong");
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dt.appendElement("br");
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}
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for (Element dd : document.select("dd")) {
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dd.tagName("em");
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dd.appendElement("br").appendElement("br");
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}
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// Abbreviations
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document.select("abbr").tagName("u");
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// Remove link tracking pixels
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if (paranoid)
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for (Element img : document.select("img"))
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if (isTrackingPixel(img)) {
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String src = img.attr("src");
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img.removeAttr("src");
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img.tagName("a");
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img.attr("href", src);
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img.appendText(context.getString(R.string.title_hint_tracking_image,
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img.attr("width"), img.attr("height")));
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}
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// Tables
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for (Element col : document.select("th,td")) {
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// separate columns by a space
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if (col.nextElementSibling() == null) {
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if (col.selectFirst("div,table,p") == null)
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col.appendElement("br");
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} else
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col.append(" ");
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if ("th".equals(col.tagName()))
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col.tagName("strong");
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else
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col.tagName("span");
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}
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for (Element row : document.select("tr"))
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row.tagName("span");
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document.select("caption").tagName("p");
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for (Element table : document.select("table"))
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if (table.parent() != null && "a".equals(table.parent().tagName()))
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table.tagName("span"); // // Links cannot contain tables
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else
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table.tagName("div");
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// Lists
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for (Element li : document.select("li")) {
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li.tagName("span");
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li.prependText("* ");
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li.appendElement("br"); // line break after list item
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}
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document.select("ol").tagName("div");
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document.select("ul").tagName("div");
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final Pattern pattern = Pattern.compile(
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PatternsCompat.AUTOLINK_EMAIL_ADDRESS.pattern() + "|" +
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PatternsCompat.AUTOLINK_WEB_URL.pattern());
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// Subscript/Superscript
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for (Element subp : document.select("sub,sup")) {
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Element small = document.createElement("small");
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small.html(subp.html());
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subp.html(small.outerHtml());
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}
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// Autolink
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NodeTraversor.traverse(new NodeVisitor() {
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@Override
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public void head(Node node, int depth) {
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if (node instanceof TextNode) {
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TextNode tnode = (TextNode) node;
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String text = tnode.text();
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Matcher matcher = pattern.matcher(text);
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if (matcher.find()) {
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Element span = document.createElement("span");
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int pos = 0;
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do {
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boolean linked = false;
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Node parent = tnode.parent();
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while (parent != null) {
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if ("a".equals(parent.nodeName())) {
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linked = true;
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break;
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}
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parent = parent.parent();
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}
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boolean email = matcher.group().contains("@") && !matcher.group().contains(":");
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if (BuildConfig.DEBUG)
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Log.i("Web url=" + matcher.group() +
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" " + matcher.start() + "..." + matcher.end() + "/" + text.length() +
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" linked=" + linked + " email=" + email);
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if (linked)
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span.appendText(text.substring(pos, matcher.end()));
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else {
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span.appendText(text.substring(pos, matcher.start()));
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Element a = document.createElement("a");
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a.attr("href", (email ? "mailto:" : "") + matcher.group());
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a.text(matcher.group());
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span.appendChild(a);
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}
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pos = matcher.end();
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} while (matcher.find());
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span.appendText(text.substring(pos));
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tnode.before(span);
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tnode.text("");
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}
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}
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}
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@Override
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public void tail(Node node, int depth) {
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}
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}, document);
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// Remove block elements displaying nothing
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for (Element e : document.select("*"))
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if (e.isBlock() && !e.hasText() && e.select("img").size() == 0)
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e.remove();
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Element body = document.body();
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return (body == null ? "" : body.html());
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}
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static Drawable decodeImage(final String source, final long id, boolean show, final TextView view) {
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(view.getContext());
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boolean compact = prefs.getBoolean("compact", false);
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int zoom = prefs.getInt("zoom", compact ? 0 : 1);
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final int px = Helper.dp2pixels(view.getContext(), (zoom + 1) * 24);
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final Resources.Theme theme = view.getContext().getTheme();
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final Resources res = view.getContext().getResources();
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if (TextUtils.isEmpty(source)) {
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Drawable d = res.getDrawable(R.drawable.baseline_broken_image_24, theme);
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d.setBounds(0, 0, px, px);
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return d;
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}
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boolean embedded = source.startsWith("cid:");
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boolean data = source.startsWith("data:");
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if (BuildConfig.DEBUG)
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Log.i("Image show=" + show + " embedded=" + embedded + " data=" + data + " source=" + source);
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if (!show) {
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// Show placeholder icon
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int resid = (embedded || data ? R.drawable.baseline_photo_library_24 : R.drawable.baseline_image_24);
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Drawable d = res.getDrawable(resid, theme);
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d.setBounds(0, 0, px, px);
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return d;
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}
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// Embedded images
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if (embedded) {
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DB db = DB.getInstance(view.getContext());
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String cid = "<" + source.substring(4) + ">";
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EntityAttachment attachment = db.attachment().getAttachment(id, cid);
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if (attachment == null) {
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Log.i("Image not found CID=" + cid);
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Drawable d = res.getDrawable(R.drawable.baseline_broken_image_24, theme);
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d.setBounds(0, 0, px, px);
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return d;
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} else if (!attachment.available) {
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Log.i("Image not available CID=" + cid);
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Drawable d = res.getDrawable(R.drawable.baseline_photo_library_24, theme);
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d.setBounds(0, 0, px, px);
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return d;
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} else {
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Bitmap bm = Helper.decodeImage(attachment.getFile(view.getContext()),
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res.getDisplayMetrics().widthPixels);
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if (bm == null) {
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Log.i("Image not decodable CID=" + cid);
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Drawable d = res.getDrawable(R.drawable.baseline_broken_image_24, theme);
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d.setBounds(0, 0, px, px);
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return d;
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} else {
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Drawable d = new BitmapDrawable(res, bm);
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d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
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return d;
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}
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}
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}
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// Data URI
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if (data)
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try {
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// "<img src=\"data:image/png;base64,iVBORw0KGgoAAA" +
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// "ANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4" +
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// "//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU" +
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// "5ErkJggg==\" alt=\"Red dot\" />";
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String base64 = source.substring(source.indexOf(',') + 1);
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byte[] bytes = Base64.decode(base64.getBytes(), 0);
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Bitmap bm = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
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if (bm == null)
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throw new IllegalArgumentException("decode byte array failed");
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Drawable d = new BitmapDrawable(res, bm);
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d.setBounds(0, 0, bm.getWidth(), bm.getHeight());
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return d;
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} catch (IllegalArgumentException ex) {
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Log.w(ex);
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Drawable d = res.getDrawable(R.drawable.baseline_broken_image_24, theme);
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d.setBounds(0, 0, px, px);
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return d;
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}
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// Get cache file name
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File dir = new File(view.getContext().getCacheDir(), "images");
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if (!dir.exists())
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dir.mkdir();
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final File file = new File(dir, id + "_" + Math.abs(source.hashCode()) + ".png");
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Drawable cached = getCachedImage(view.getContext(), file);
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if (cached != null)
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return cached;
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final LevelListDrawable lld = new LevelListDrawable();
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Drawable wait = res.getDrawable(R.drawable.baseline_hourglass_empty_24, theme);
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lld.addLevel(0, 0, wait);
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lld.setBounds(0, 0, px, px);
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final Context context = view.getContext().getApplicationContext();
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executor.submit(new Runnable() {
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@Override
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public void run() {
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try {
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Drawable cached = getCachedImage(context, file);
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if (cached != null) {
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post(cached, source);
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return;
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}
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BitmapFactory.Options options = new BitmapFactory.Options();
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Log.i("Probe " + source);
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try (InputStream probe = new URL(source).openStream()) {
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options.inJustDecodeBounds = true;
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BitmapFactory.decodeStream(probe, null, options);
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}
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Log.i("Download " + source);
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Bitmap bm;
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try (InputStream is = new URL(source).openStream()) {
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int scaleTo = res.getDisplayMetrics().widthPixels;
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int factor = 1;
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while (options.outWidth / factor > scaleTo)
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factor *= 2;
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if (factor > 1) {
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Log.i("Download image factor=" + factor);
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options.inJustDecodeBounds = false;
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options.inSampleSize = factor;
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bm = BitmapFactory.decodeStream(is, null, options);
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} else
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bm = BitmapFactory.decodeStream(is);
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}
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if (bm == null)
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throw new FileNotFoundException("Download image failed source=" + source);
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Log.i("Downloaded image source=" + source);
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try (OutputStream os = new BufferedOutputStream(new FileOutputStream(file))) {
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bm.compress(Bitmap.CompressFormat.PNG, 90, os);
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}
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// Create drawable from bitmap
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Drawable d = new BitmapDrawable(res, bm);
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d.setBounds(0, 0, bm.getWidth(), bm.getHeight());
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post(d, source);
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} catch (Throwable ex) {
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// Show warning icon
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Log.w(ex);
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int resid = (ex instanceof IOException && !(ex instanceof FileNotFoundException)
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? R.drawable.baseline_cloud_off_24
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: R.drawable.baseline_broken_image_24);
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Drawable d = res.getDrawable(resid, theme);
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d.setBounds(0, 0, px, px);
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post(d, source);
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}
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}
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private void post(final Drawable d, String source) {
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Log.i("Posting image=" + source);
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new Handler(context.getMainLooper()).post(new Runnable() {
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@Override
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public void run() {
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int w = d.getIntrinsicWidth();
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int h = d.getIntrinsicHeight();
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float width = view.getWidth();
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if (w > width) {
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float scale = width / w;
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w = Math.round(w * scale);
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h = Math.round(h * scale);
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d.setBounds(0, 0, w, h);
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}
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lld.addLevel(1, 1, d);
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lld.setBounds(0, 0, w, h);
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lld.setLevel(1);
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view.setText(view.getText());
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}
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});
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}
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});
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return lld;
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}
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static private Drawable getCachedImage(Context context, File file) {
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if (file.exists()) {
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Log.i("Using cached " + file);
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Bitmap bm = BitmapFactory.decodeFile(file.getAbsolutePath());
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if (bm != null) {
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Drawable d = new BitmapDrawable(context.getResources(), bm);
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d.setBounds(0, 0, bm.getWidth(), bm.getHeight());
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return d;
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}
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}
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return null;
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}
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static String getPreview(String body) {
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String text = (body == null ? null : Jsoup.parse(body).text());
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return (text == null ? null : text.substring(0, Math.min(text.length(), PREVIEW_SIZE)));
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}
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static String getText(String html) {
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final StringBuilder sb = new StringBuilder();
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|
|
|
NodeTraversor.traverse(new NodeVisitor() {
|
|
private int qlevel = 0;
|
|
private int tlevel = 0;
|
|
|
|
public void head(Node node, int depth) {
|
|
if (node instanceof TextNode) {
|
|
append(((TextNode) node).text());
|
|
append(" ");
|
|
} else {
|
|
String name = node.nodeName();
|
|
if ("li".equals(name))
|
|
append("* ");
|
|
else if ("blockquote".equals(name))
|
|
qlevel++;
|
|
|
|
if (heads.contains(name))
|
|
newline();
|
|
}
|
|
}
|
|
|
|
public void tail(Node node, int depth) {
|
|
String name = node.nodeName();
|
|
if ("a".equals(name)) {
|
|
append("[");
|
|
append(node.absUrl("href"));
|
|
append("] ");
|
|
} else if ("img".equals(name)) {
|
|
append("[");
|
|
append(node.absUrl("src"));
|
|
append("] ");
|
|
} else if ("th".equals(name) || "td".equals(name)) {
|
|
Node next = node.nextSibling();
|
|
if (next == null || !("th".equals(next.nodeName()) || "td".equals(next.nodeName())))
|
|
newline();
|
|
} else if ("blockquote".equals(name))
|
|
qlevel--;
|
|
|
|
if (tails.contains(name))
|
|
newline();
|
|
}
|
|
|
|
private void append(String text) {
|
|
if (tlevel != qlevel) {
|
|
newline();
|
|
tlevel = qlevel;
|
|
}
|
|
sb.append(text);
|
|
}
|
|
|
|
private void newline() {
|
|
trimEnd(sb);
|
|
sb.append("\n");
|
|
for (int i = 0; i < qlevel; i++)
|
|
sb.append('>');
|
|
if (qlevel > 0)
|
|
sb.append(' ');
|
|
}
|
|
}, Jsoup.parse(html));
|
|
|
|
trimEnd(sb);
|
|
sb.append("\n");
|
|
|
|
return sb.toString();
|
|
}
|
|
|
|
static String getHtmlEmbedded(Context context, long id, String html) throws IOException {
|
|
DB db = DB.getInstance(context);
|
|
|
|
Document doc = Jsoup.parse(html);
|
|
for (Element img : doc.select("img")) {
|
|
String src = img.attr("src");
|
|
if (src.startsWith("cid:")) {
|
|
String cid = '<' + src.substring(4) + '>';
|
|
EntityAttachment attachment = db.attachment().getAttachment(id, cid);
|
|
if (attachment != null && attachment.available) {
|
|
File file = attachment.getFile(context);
|
|
try (InputStream is = new BufferedInputStream(new FileInputStream(file))) {
|
|
byte[] bytes = new byte[(int) file.length()];
|
|
if (is.read(bytes) != bytes.length)
|
|
throw new IOException("length");
|
|
|
|
StringBuilder sb = new StringBuilder();
|
|
sb.append("data:");
|
|
sb.append(attachment.type);
|
|
sb.append(";base64,");
|
|
sb.append(Base64.encodeToString(bytes, Base64.DEFAULT));
|
|
|
|
img.attr("src", sb.toString());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return doc.html();
|
|
}
|
|
|
|
private static boolean isTrackingPixel(Element img) {
|
|
String src = img.attr("src");
|
|
String width = img.attr("width").trim();
|
|
String height = img.attr("height").trim();
|
|
|
|
if (TextUtils.isEmpty(src))
|
|
return false;
|
|
if (TextUtils.isEmpty(width) || TextUtils.isEmpty(height))
|
|
return false;
|
|
|
|
try {
|
|
return (Integer.parseInt(width) * Integer.parseInt(height) <= TRACKING_PIXEL_SURFACE);
|
|
} catch (NumberFormatException ignored) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
private static void trimEnd(StringBuilder sb) {
|
|
int length = sb.length();
|
|
while (length > 0 && sb.charAt(length - 1) == ' ')
|
|
length--;
|
|
sb.setLength(length);
|
|
}
|
|
|
|
static Spanned fromHtml(@NonNull String html) {
|
|
return fromHtml(html, null, null);
|
|
}
|
|
|
|
static Spanned fromHtml(@NonNull String html, @Nullable Html.ImageGetter imageGetter, @Nullable Html.TagHandler tagHandler) {
|
|
Spanned spanned = HtmlCompat.fromHtml(html, FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM, imageGetter, tagHandler);
|
|
|
|
int i = spanned.length();
|
|
while (i > 1 && spanned.charAt(i - 2) == '\n' && spanned.charAt(i - 1) == '\n')
|
|
i--;
|
|
if (i != spanned.length())
|
|
spanned = (Spanned) spanned.subSequence(0, i);
|
|
|
|
return spanned;
|
|
}
|
|
|
|
static String toHtml(Spanned spanned) {
|
|
String html = HtmlCompat.toHtml(spanned, TO_HTML_PARAGRAPH_LINES_CONSECUTIVE);
|
|
|
|
// @Google: why convert size to and from in a different way?
|
|
Document doc = Jsoup.parse(html);
|
|
for (Element element : doc.select("span")) {
|
|
String style = element.attr("style");
|
|
if (style.startsWith("font-size:")) {
|
|
int colon = style.indexOf(':');
|
|
int semi = style.indexOf("em;", colon);
|
|
if (semi > colon)
|
|
try {
|
|
String hsize = style.substring(colon + 1, semi).replace(',', '.');
|
|
float size = Float.parseFloat(hsize);
|
|
element.tagName(size < 1.0f ? "small" : "big");
|
|
element.attributes().remove("style");
|
|
} catch (NumberFormatException ex) {
|
|
Log.e(ex);
|
|
}
|
|
}
|
|
}
|
|
|
|
return doc.outerHtml();
|
|
}
|
|
}
|