implement publickey authentication in JavaFileStorage (not yet integrated in main app)

src/java/JavaFileStorageTest-AS/app/src/main/java/com/crocoapps/javafilestoragetest/MainActivity.java

@@ -135,7 +135,12 @@ package com.crocoapps.javafilestoragetest;
 import group.pals.android.lib.ui.filechooser.FileChooserActivity;
 import group.pals.android.lib.ui.filechooser.providers.BaseFileProviderUtils;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
 import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
 import java.util.List;
@@ -662,6 +667,20 @@ public class MainActivity extends Activity implements JavaFileStorage.FileStorag
 		return this;
 	}
 
+	public static String readStream(InputStream is) {
+		StringBuilder sb = new StringBuilder(512);
+		try {
+			Reader r = new InputStreamReader(is, "UTF-8");
+			int c = 0;
+			while ((c = r.read()) != -1) {
+				sb.append((char) c);
+			}
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+		return sb.toString();
+	}
+
 	@Override
 	public void performManualFileSelect(boolean isForSave, final int requestCode,
 			String protocolId)
@@ -669,6 +688,30 @@ public class MainActivity extends Activity implements JavaFileStorage.FileStorag
 		if (protocolId.equals("sftp"))
 		{
 			final View view = getLayoutInflater().inflate(R.layout.sftp_credentials, null);
+
+			view.findViewById(R.id.send_public_key).setOnClickListener(v -> {
+				Intent sendIntent = new Intent();
+
+
+                SftpStorage sftpStorage = (SftpStorage)storageToTest;
+                try {
+                    String pub_filename = sftpStorage.createKeyPair();
+
+                    sendIntent.setAction(Intent.ACTION_SEND);
+                    sendIntent.putExtra(Intent.EXTRA_TEXT, readStream(new FileInputStream(pub_filename)));
+
+                    sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Keepass2Android sftp public key");
+                    sendIntent.setType("text/plain");
+                    this.startActivity(Intent.createChooser(sendIntent, "Send public key to..."));
+                }
+                catch (Exception ex)
+                {
+                    Toast.makeText(this,"Failed to create key pair: " + ex.getMessage(), Toast.LENGTH_LONG);
+                    return;
+                }
+
+
+			});
 			new AlertDialog.Builder(this)
 					.setView(view)
 					.setTitle("Enter SFTP credentials")

src/java/JavaFileStorageTest-AS/app/src/main/res/layout/sftp_credentials.xml

@@ -15,7 +15,7 @@
             android:layout_height="wrap_content"
             android:singleLine="true"
             android:inputType="textNoSuggestions"
-            android:text=""
+            android:text="philipp-gross"
 			android:hint="@string/hint_sftp_host" />
 	  <TextView
             android:id="@+id/portsep"
@@ -63,6 +63,9 @@
             android:singleLine="true"
 			android:text="/home/philipp"
 			 />
-		
+		<Button android:id="@+id/send_public_key"
+			android:layout_width="fill_parent"
+			android:layout_height="wrap_content"
+			android:text="send public key" />
 
 </LinearLayout>