Implemented MS config POST request

app/src/main/java/eu/faircode/email/EmailProvider.java

@@ -32,10 +32,13 @@ import android.util.Xml;
 import androidx.annotation.NonNull;
 import androidx.preference.PreferenceManager;
 
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 import org.xmlpull.v1.XmlPullParserFactory;
 
+import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
@@ -73,6 +76,14 @@ import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.SSLSession;
 import javax.net.ssl.SSLSocket;
 import javax.net.ssl.SSLSocketFactory;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
 
 public class EmailProvider implements Parcelable {
     public String id;
@@ -879,7 +890,7 @@ public class EmailProvider implements Parcelable {
         for (String link : Misc.getMSUrls(context, domain, email))
             try {
                 URL url = new URL(link);
-                return getMSAutodiscovery(context, domain, url, true, intf);
+                return getMSAutodiscovery(context, domain, email, url, true, intf);
             } catch (Throwable ex) {
                 Log.i(ex);
             }
@@ -887,18 +898,47 @@ public class EmailProvider implements Parcelable {
         throw new UnknownHostException(domain);
     }
 
-    private static EmailProvider getMSAutodiscovery(Context context, String domain, URL url, boolean unsafe, IDiscovery intf) throws IOException, XmlPullParserException {
+    private static EmailProvider getMSAutodiscovery(Context context, String domain, String email, URL url, boolean unsafe, IDiscovery intf)
+            throws IOException, XmlPullParserException, ParserConfigurationException, TransformerException {
         EmailProvider provider = new EmailProvider(domain);
 
+        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
+        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
+
+        // root elements
+        Document doc = docBuilder.newDocument();
+        Element xAutodiscover = doc.createElement("Autodiscover");
+        xAutodiscover.setAttribute("xmlns", "http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006");
+        doc.appendChild(xAutodiscover);
+
+        Element xRequest = doc.createElement("Request");
+        xAutodiscover.appendChild(xRequest);
+
+        Element xEMailAddress = doc.createElement("EMailAddress");
+        xEMailAddress.setTextContent(email);
+        xRequest.appendChild(xEMailAddress);
+
+        Element xAcceptableResponseSchema = doc.createElement("AcceptableResponseSchema");
+        xAcceptableResponseSchema.setTextContent("http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a");
+        xRequest.appendChild(xAcceptableResponseSchema);
+
+        TransformerFactory transformerFactory = TransformerFactory.newInstance();
+        Transformer transformer = transformerFactory.newTransformer();
+        DOMSource source = new DOMSource(doc);
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        StreamResult result = new StreamResult(bos);
+        transformer.transform(source, result);
+
         HttpURLConnection request = null;
         try {
             Log.i("Fetching " + url);
             intf.onStatus("MS " + url);
 
             request = (HttpURLConnection) url.openConnection();
-            request.setRequestMethod("GET");
+            request.setRequestMethod("POST");
             request.setReadTimeout(MS_TIMEOUT);
             request.setConnectTimeout(MS_TIMEOUT);
+            request.setDoOutput(true);
             request.setDoInput(true);
             ConnectionHelper.setUserAgent(context, request);
 
@@ -913,6 +953,8 @@ public class EmailProvider implements Parcelable {
 
             request.connect();
 
+            request.getOutputStream().write(bos.toByteArray());
+
             int status = request.getResponseCode();
             if (status != HttpURLConnection.HTTP_OK)
                 throw new FileNotFoundException("Error " + status + ": " + request.getResponseMessage());
@@ -1014,6 +1056,8 @@ public class EmailProvider implements Parcelable {
 
             provider.validate();
             Log.e("MS=" + url);
+            Log.i("MS imap=" + provider.imap);
+            Log.i("MS smtp=" + provider.smtp);
 
             return provider;
         } finally {