mirror of https://github.com/M66B/FairEmail.git
452 lines
18 KiB
Java
452 lines
18 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.res.XmlResourceParser;
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import org.xbill.DNS.Lookup;
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import org.xbill.DNS.Record;
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import org.xbill.DNS.SRVRecord;
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import org.xbill.DNS.SimpleResolver;
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import org.xbill.DNS.TextParseException;
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import org.xbill.DNS.Type;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import org.xmlpull.v1.XmlPullParserFactory;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.net.HttpURLConnection;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import java.net.URL;
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import java.net.UnknownHostException;
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import java.text.Collator;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Locale;
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public class EmailProvider {
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public String name;
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public int order;
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public int keepalive;
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public String link;
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public String type;
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public String imap_host;
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public boolean imap_starttls;
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public int imap_port;
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public String smtp_host;
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public int smtp_port;
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public boolean smtp_starttls;
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public UserType user = UserType.EMAIL;
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public String helpUrl = null;
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public StringBuilder documentation = null; // html
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enum UserType {LOCAL, EMAIL}
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private static final int TIMEOUT = 20 * 1000; // milliseconds
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private EmailProvider() {
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}
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EmailProvider(String name) {
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this.name = name;
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}
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private void checkValid() throws UnknownHostException {
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if (this.imap_host == null || this.imap_port == 0 ||
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this.smtp_host == null || this.smtp_port == 0)
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throw new UnknownHostException(this.name + " invalid");
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}
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private EmailProvider(String name, String domain, String imap_prefix, String smtp_prefix) {
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this.name = name;
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this.imap_host = (imap_prefix == null ? "" : imap_prefix + ".") + domain;
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this.imap_port = 993;
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this.imap_starttls = false;
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this.smtp_host = (smtp_prefix == null ? "" : smtp_prefix + ".") + domain;
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this.smtp_port = 587;
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this.smtp_starttls = true;
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}
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static List<EmailProvider> loadProfiles(Context context) {
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List<EmailProvider> result = null;
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try {
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EmailProvider provider = null;
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XmlResourceParser xml = context.getResources().getXml(R.xml.providers);
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int eventType = xml.getEventType();
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while (eventType != XmlPullParser.END_DOCUMENT) {
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if (eventType == XmlPullParser.START_TAG) {
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String name = xml.getName();
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if ("providers".equals(name))
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result = new ArrayList<>();
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else if ("provider".equals(name)) {
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provider = new EmailProvider();
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provider.name = xml.getAttributeValue(null, "name");
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provider.order = xml.getAttributeIntValue(null, "order", Integer.MAX_VALUE);
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provider.keepalive = xml.getAttributeIntValue(null, "keepalive", 0);
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provider.link = xml.getAttributeValue(null, "link");
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provider.type = xml.getAttributeValue(null, "type");
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} else if ("imap".equals(name)) {
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provider.imap_host = xml.getAttributeValue(null, "host");
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provider.imap_port = xml.getAttributeIntValue(null, "port", 0);
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provider.imap_starttls = xml.getAttributeBooleanValue(null, "starttls", false);
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} else if ("smtp".equals(name)) {
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provider.smtp_host = xml.getAttributeValue(null, "host");
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provider.smtp_port = xml.getAttributeIntValue(null, "port", 0);
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provider.smtp_starttls = xml.getAttributeBooleanValue(null, "starttls", false);
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} else
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throw new IllegalAccessException(name);
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} else if (eventType == XmlPullParser.END_TAG) {
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if ("provider".equals(xml.getName())) {
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addSpecials(context, provider);
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result.add(provider);
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provider = null;
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}
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}
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eventType = xml.next();
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}
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} catch (Throwable ex) {
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Log.e(ex);
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}
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final Collator collator = Collator.getInstance(Locale.getDefault());
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collator.setStrength(Collator.SECONDARY); // Case insensitive, process accents etc
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Collections.sort(result, new Comparator<EmailProvider>() {
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@Override
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public int compare(EmailProvider p1, EmailProvider p2) {
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int o = Integer.compare(p1.order, p2.order);
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if (o == 0)
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return collator.compare(p1.name, p2.name);
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else
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return o;
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}
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});
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return result;
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}
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static EmailProvider fromDomain(Context context, String domain) throws IOException {
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try {
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Log.i("Provider from DNS domain=" + domain);
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return addSpecials(context, fromDNS(domain));
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} catch (Throwable ex) {
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Log.w(ex);
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try {
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Log.i("Provider from ISPDB domain=" + domain);
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return addSpecials(context, fromISPDB(domain));
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} catch (Throwable ex1) {
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Log.w(ex1);
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try {
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Log.i("Provider from template domain=" + domain);
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return addSpecials(context, fromTemplate(domain));
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} catch (Throwable ex2) {
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Log.w(ex2);
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throw new UnknownHostException(context.getString(R.string.title_setup_no_settings, domain));
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}
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}
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}
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}
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private static EmailProvider fromISPDB(String domain) throws IOException, XmlPullParserException {
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EmailProvider provider = new EmailProvider(domain);
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// https://wiki.mozilla.org/Thunderbird:Autoconfiguration:ConfigFileFormat
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URL url = new URL("https://autoconfig.thunderbird.net/v1.1/" + domain);
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Log.i("Fetching " + url);
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HttpURLConnection request = (HttpURLConnection) url.openConnection();
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request.setReadTimeout(TIMEOUT);
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request.setConnectTimeout(TIMEOUT);
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request.setRequestMethod("GET");
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request.setDoInput(true);
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request.connect();
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// https://developer.android.com/reference/org/xmlpull/v1/XmlPullParser
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XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
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XmlPullParser xml = factory.newPullParser();
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xml.setInput(new InputStreamReader(request.getInputStream()));
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boolean imap = false;
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boolean smtp = false;
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String href = null;
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String title = null;
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int eventType = xml.getEventType();
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while (eventType != XmlPullParser.END_DOCUMENT) {
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if (eventType == XmlPullParser.START_TAG) {
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String name = xml.getName();
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if ("displayShortName".equals(name)) {
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// <displayShortName>GMail</displayShortName>
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String display = xml.getText();
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Log.i("Name=" + display);
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provider.name = display;
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}
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continue;
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} else if ("incomingServer".equals(name)) {
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// <incomingServer type="imap">
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// <hostname>imap.gmail.com</hostname>
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// <port>993</port>
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// <socketType>SSL</socketType>
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// <username>%EMAILADDRESS%</username>
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// <authentication>OAuth2</authentication>
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// <authentication>password-cleartext</authentication>
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// </incomingServer>
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imap = "imap".equals(xml.getAttributeValue(null, "type"));
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} else if ("outgoingServer".equals(name)) {
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// <outgoingServer type="smtp">
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// <hostname>smtp.gmail.com</hostname>
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// <port>465</port>
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// <socketType>SSL</socketType>
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// <username>%EMAILADDRESS%</username>
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// <authentication>OAuth2</authentication>
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// <authentication>password-cleartext</authentication>
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// </outgoingServer>
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smtp = "smtp".equals(xml.getAttributeValue(null, "type"));
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} else if ("hostname".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String host = xml.getText();
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Log.i("Host=" + host);
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if (imap)
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provider.imap_host = host;
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else if (smtp)
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provider.smtp_host = host;
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}
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continue;
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} else if ("port".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String port = xml.getText();
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Log.i("Port=" + port);
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if (imap) {
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provider.imap_port = Integer.parseInt(port);
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provider.imap_starttls = (provider.imap_port == 143);
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} else if (smtp) {
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provider.smtp_port = Integer.parseInt(port);
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provider.smtp_starttls = (provider.smtp_port == 587);
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}
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}
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continue;
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} else if ("socketType".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String socket = xml.getText();
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Log.i("Socket=" + socket);
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if ("SSL".equals(socket)) {
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if (imap)
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provider.imap_starttls = false;
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else if (smtp)
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provider.smtp_starttls = false;
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} else if ("STARTTLS".equals(socket)) {
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if (imap)
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provider.imap_starttls = true;
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else if (smtp)
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provider.smtp_starttls = true;
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} else
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Log.w("Unknown socket type=" + socket);
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}
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continue;
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} else if ("username".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String username = xml.getText();
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Log.i("Username=" + username);
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if ("%EMAILADDRESS%".equals(username))
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provider.user = UserType.EMAIL;
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else if ("%EMAILLOCALPART%".equals(username))
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provider.user = UserType.LOCAL;
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else
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Log.w("Unknown username type=" + username);
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}
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continue;
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} else if ("enable".equals(name)) {
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// <enable visiturl="https://mail.google.com/mail/?ui=2&shva=1#settings/fwdandpop">
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// <instruction>You need to enable IMAP access</instruction>
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// </enable>
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href = xml.getAttributeValue(null, "visiturl");
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title = null;
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} else if ("documentation".equals(name)) {
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// <documentation url="http://mail.google.com/support/bin/answer.py?answer=13273">
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// <descr>How to enable IMAP/POP3 in GMail</descr>
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// </documentation>
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href = xml.getAttributeValue(null, "url");
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title = null;
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} else if ("instruction".equals(name) || "descr".equals(name)) {
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if (href != null) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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if (title == null)
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title = "";
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else
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title += "<br />";
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title += xml.getText();
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}
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continue;
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}
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}
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} else if (eventType == XmlPullParser.END_TAG) {
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String name = xml.getName();
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if ("incomingServer".equals(name))
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imap = false;
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else if ("outgoingServer".equals(name))
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smtp = false;
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else if ("enable".equals(name) || "documentation".equals(name)) {
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if (href != null) {
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if (title == null)
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title = href;
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addDocumentation(provider, href, title);
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href = null;
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title = null;
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}
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}
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}
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eventType = xml.next();
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}
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request.disconnect();
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Log.i("imap=" + provider.imap_host + ":" + provider.imap_port + ":" + provider.imap_starttls);
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Log.i("smtp=" + provider.smtp_host + ":" + provider.smtp_port + ":" + provider.smtp_starttls);
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provider.checkValid();
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return provider;
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}
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private static EmailProvider fromDNS(String domain) throws TextParseException, UnknownHostException {
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// https://tools.ietf.org/html/rfc6186
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SRVRecord imap = lookup("_imaps._tcp." + domain);
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SRVRecord smtp = lookup("_submission._tcp." + domain);
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EmailProvider provider = new EmailProvider(domain);
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provider.imap_host = imap.getTarget().toString(true);
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provider.imap_port = imap.getPort();
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provider.imap_starttls = (provider.imap_port == 143);
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provider.smtp_host = smtp.getTarget().toString(true);
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provider.smtp_port = smtp.getPort();
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provider.smtp_starttls = (provider.smtp_port == 587);
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return provider;
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}
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private static EmailProvider fromTemplate(String domain) throws UnknownHostException {
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if (checkTemplate(domain, null, 993, null, 587))
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return new EmailProvider(domain, domain, null, null);
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else if (checkTemplate(domain, "imap", 993, "smtp", 587))
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return new EmailProvider(domain, domain, "imap", "smtp");
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else if (checkTemplate(domain, "mail", 993, "mail", 587))
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return new EmailProvider(domain, domain, "mail", "mail");
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else
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throw new UnknownHostException(domain + " template");
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}
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private static boolean checkTemplate(
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String domain, String imap_prefix, int imap_port, String smtp_prefix, int smtp_port) {
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return isHostReachable((imap_prefix == null ? "" : imap_prefix + ".") + domain, imap_port, 5000) &&
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isHostReachable((smtp_prefix == null ? "" : smtp_prefix + ".") + domain, smtp_port, 5000);
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}
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static boolean isHostReachable(String host, int port, int timeoutms) {
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Log.i("Checking " + host + ":" + port);
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try (Socket socket = new Socket()) {
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InetAddress iaddr = InetAddress.getByName(host);
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InetSocketAddress inetSocketAddress = new InetSocketAddress(iaddr, port);
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socket.connect(inetSocketAddress, timeoutms);
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return true;
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} catch (IOException ex) {
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Log.w(ex);
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return false;
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}
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}
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private static void addDocumentation(EmailProvider provider, String href, String title) {
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if (provider.documentation == null)
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provider.documentation = new StringBuilder();
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else
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provider.documentation.append("<br /><br />");
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provider.documentation.append("<a href=\"").append(href).append("\">").append(title).append("</a>");
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}
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private static EmailProvider addSpecials(Context context, EmailProvider provider) {
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if ("imap.gmail.com".equals(provider.imap_host))
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provider.helpUrl = Helper.FAQ_URI + "#user-content-faq6";
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if (provider.imap_host.endsWith("office365.com") ||
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provider.imap_host.endsWith("live.com"))
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provider.helpUrl = Helper.FAQ_URI + "#user-content-faq14";
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if (provider.imap_host.endsWith("yahoo.com"))
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provider.helpUrl = Helper.FAQ_URI + "#user-content-faq88";
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return provider;
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}
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private static SRVRecord lookup(String dns) throws TextParseException, UnknownHostException {
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Lookup lookup = new Lookup(dns, Type.SRV);
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// https://dns.watch/ 84.200.69.80
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SimpleResolver resolver = new SimpleResolver("8.8.8.8");
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lookup.setResolver(resolver);
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Log.i("Lookup dns=" + dns + " @" + resolver.getAddress());
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Record[] records = lookup.run();
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if (lookup.getResult() != Lookup.SUCCESSFUL)
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if (lookup.getResult() == Lookup.HOST_NOT_FOUND)
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throw new UnknownHostException(dns);
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else
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throw new IllegalArgumentException(lookup.getErrorString());
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Log.i("Found dns=" + (records == null ? -1 : records.length));
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return (records == null || records.length == 0 ? null : (SRVRecord) records[0]);
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}
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@Override
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public String toString() {
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return name;
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}
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}
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