-implementation of "--send-key"

-implementation of "--sign-key"
-partial implementation of exchanging/verifying keys via QR Code

src/org/thialfihar/android/apg/ImportFromQRCodeActivity.java

@@ -0,0 +1,133 @@
+package org.thialfihar.android.apg;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+
+import org.spongycastle.openpgp.PGPKeyRing;
+import org.spongycastle.openpgp.PGPPublicKeyRing;
+import org.thialfihar.android.apg.KeyServer.QueryException;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Message;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.google.zxing.integration.android.IntentIntegrator;
+import com.google.zxing.integration.android.IntentResult;
+
+public class ImportFromQRCodeActivity extends BaseActivity {
+    private static final String TAG = "ImportFromQRCodeActivity";
+
+    private final Bundle status = new Bundle();
+    private final Message msg = new Message();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        IntentIntegrator.initiateScan(this);
+    }
+
+    private void importAndSign(final long keyId, final String expectedFingerprint) {
+        if (expectedFingerprint != null && expectedFingerprint.length() > 0) {
+            
+            Thread t = new Thread() {
+                @Override
+                public void run() {
+                    try {
+                        // TODO: display some sort of spinner here while the user waits
+                        
+                        HkpKeyServer server = new HkpKeyServer(mPreferences.getKeyServers()[0]); // TODO: there should be only 1
+                        String encodedKey = server.get(keyId);
+
+                        PGPKeyRing keyring = Apg.decodeKeyRing(new ByteArrayInputStream(encodedKey.getBytes()));
+                        if (keyring != null && keyring instanceof PGPPublicKeyRing) {
+                            PGPPublicKeyRing publicKeyRing = (PGPPublicKeyRing) keyring;
+
+                            // make sure the fingerprints match before we cache this thing
+                            String actualFingerprint = Apg.convertToHex(publicKeyRing.getPublicKey().getFingerprint());
+                            if (expectedFingerprint.equals(actualFingerprint)) {
+                                // store the signed key in our local cache
+                                int retval = Apg.storeKeyRingInCache(publicKeyRing);
+                                if (retval != Id.return_value.ok && retval != Id.return_value.updated) {
+                                    status.putString(Apg.EXTRA_ERROR, "Failed to store signed key in local cache");
+                                } else {
+                                    Intent intent = new Intent(ImportFromQRCodeActivity.this, SignKeyActivity.class);
+                                    intent.putExtra(Apg.EXTRA_KEY_ID, keyId);
+                                    startActivityForResult(intent, Id.request.sign_key);
+                                }
+                            } else {
+                                status.putString(Apg.EXTRA_ERROR, "Scanned fingerprint does NOT match the fingerprint of the received key.  You shouldnt trust this key.");
+                            }
+                        }
+                    } catch (QueryException e) {
+                        Log.e(TAG, "Failed to query KeyServer", e);
+                        status.putString(Apg.EXTRA_ERROR, "Failed to query KeyServer");
+                        status.putInt(Constants.extras.status, Id.message.done);
+                    } catch (IOException e) {
+                        Log.e(TAG, "Failed to query KeyServer", e);
+                        status.putString(Apg.EXTRA_ERROR, "Failed to query KeyServer");
+                        status.putInt(Constants.extras.status, Id.message.done);
+                    }
+                }
+            };
+
+            t.setName("KeyExchange Download Thread");
+            t.setDaemon(true);
+            t.start();
+        }
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        switch (requestCode) {
+            case IntentIntegrator.REQUEST_CODE: {
+                boolean debug = true; // TODO: remove this!!!
+                IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
+                if (debug || (scanResult != null && scanResult.getFormatName() != null)) {
+                    String[] bits = debug ? new String[] { "5993515643896327656", "0816 F68A 6816 68FB 01BF  2CA5 532D 3EB9 1E2F EDE8" } : scanResult.getContents().split(",");
+                    if (bits.length != 2) {
+                        return; // dont know how to handle this.  Not a valid code
+                    }
+
+                    long keyId = Long.parseLong(bits[0]);
+                    String expectedFingerprint = bits[1];
+                    
+                    importAndSign(keyId, expectedFingerprint);
+                    
+                    break;
+                }
+            }
+            
+            case Id.request.sign_key: {
+                // signals the end of processing.  Signature was either applied, or it wasnt
+                status.putInt(Constants.extras.status, Id.message.done);
+                
+                msg.setData(status);
+                sendMessage(msg);
+                
+                break;
+            }
+
+            default: {
+                super.onActivityResult(requestCode, resultCode, data);
+            }
+        }
+    }
+    
+    @Override
+    public void doneCallback(Message msg) {
+        super.doneCallback(msg);
+        
+        Bundle data = msg.getData();
+        String error = data.getString(Apg.EXTRA_ERROR);
+        if (error != null) {
+            Toast.makeText(this, getString(R.string.errorMessage, error), Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        Toast.makeText(this, R.string.keySignSuccess, Toast.LENGTH_SHORT).show(); // TODO
+        finish();
+    }
+}