added Facebook links support, reworked Preferences

1 files changed, 197 insertions, 0 deletions

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/FacebookKeyserver.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/FacebookKeyserver.java
new file mode 100644
index 000000000..d87a82a24
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/FacebookKeyserver.java
@@ -0,0 +1,197 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2015 Vincent Breitmoser <v.breitmoser@mugenguild.com>
+ * Copyright (C) 2015 Adithya Abraham Philip <adithyaphilip@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.keyimport;
+
+import android.net.Uri;
+import android.support.annotation.NonNull;
+
+import com.squareup.okhttp.OkHttpClient;
+import com.squareup.okhttp.Request;
+import com.squareup.okhttp.Response;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.pgp.PgpHelper;
+import org.sufficientlysecure.keychain.pgp.UncachedKeyRing;
+import org.sufficientlysecure.keychain.pgp.UncachedPublicKey;
+import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
+import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
+import org.sufficientlysecure.keychain.util.Log;
+
+import java.io.IOException;
+import java.net.Proxy;
+
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+
+public class FacebookKeyserver extends Keyserver {
+
+    private static final String FB_KEY_URL_FORMAT
+            = "https://www.facebook.com/%s/publickey/download";
+    private static final String FB_HOST = "facebook.com";
+    private static final String FB_HOST_WWW = "www." + FB_HOST;
+
+    public static final String FB_URL = "https://" + FB_HOST_WWW;
+
+    public static final String ORIGIN = FB_URL;
+
+    private final Proxy mProxy;
+
+    public FacebookKeyserver(Proxy proxy) {
+        mProxy = proxy;
+    }
+
+    @Override
+    public List<ImportKeysListEntry> search(String fbUsername)
+            throws QueryFailedException, QueryNeedsRepairException {
+        List<ImportKeysListEntry> entry = new ArrayList<>(1);
+
+        String data = get(fbUsername);
+        // if we're here that means key retrieval succeeded,
+        // would have thrown an exception otherwise
+        try {
+            UncachedKeyRing keyRing = UncachedKeyRing.decodeFromData(data.getBytes());
+            try {
+                entry.add(getEntry(keyRing, fbUsername));
+            } catch (UnsupportedOperationException e) {
+                Log.e(Constants.TAG, "Parsing retrieved Facebook key failed!");
+            }
+        } catch (PgpGeneralException | IOException e) {
+            Log.e(Constants.TAG, "Failed parsing key from Facebook during search", e);
+            throw new QueryFailedException("No valid key found on Facebook");
+        }
+        return entry;
+    }
+
+    @Override
+    public String get(String fbUsername) throws QueryFailedException {
+        Log.d(Constants.TAG, "FacebookKeyserver get: " + fbUsername + " using Proxy: " + mProxy);
+
+        String data = query(fbUsername);
+
+        if (data == null) {
+            throw new QueryFailedException("data is null");
+        }
+
+        Matcher matcher = PgpHelper.PGP_PUBLIC_KEY.matcher(data);
+        if (matcher.find()) {
+            return matcher.group(1);
+        }
+        throw new QueryFailedException("data is null");
+    }
+
+    private String query(String fbUsername) throws QueryFailedException {
+        try {
+            String request = String.format(FB_KEY_URL_FORMAT, fbUsername);
+            Log.d(Constants.TAG, "fetching from Facebook with: " + request + " proxy: " + mProxy);
+
+            OkHttpClient client = new OkHttpClient();
+            client.setProxy(mProxy);
+
+            URL url = new URL(request);
+
+            Response response = client.newCall(new Request.Builder().url(url).build()).execute();
+
+            // contains body both in case of success or failure
+            String responseBody = response.body().string();
+
+            if (response.isSuccessful()) {
+                return responseBody;
+            } else {
+                // probably a 404 indicating that the key does not exist
+                throw new QueryFailedException("key for " + fbUsername + " not found on Facebook");
+            }
+
+        } catch (IOException e) {
+            Log.e(Constants.TAG, "IOException at Facebook key download", e);
+            throw new QueryFailedException("Cannot connect to Facebook. "
+                    + "Check your Internet connection!"
+                    + (mProxy == Proxy.NO_PROXY ? "" : " Using proxy " + mProxy));
+        }
+    }
+
+    @Override
+    public void add(String armoredKey) throws AddKeyException {
+        // Implementing will require usage of FB API
+        throw new UnsupportedOperationException("Uploading keys not supported yet");
+    }
+
+    /**
+     * Facebook returns the entire key even during our searching phase.
+     *
+     * @throws UnsupportedOperationException if the key could not be parsed
+     */
+    @NonNull
+    public static ImportKeysListEntry getEntry(UncachedKeyRing ring, String fbUsername)
+            throws UnsupportedOperationException {
+        ImportKeysListEntry entry = new ImportKeysListEntry();
+        entry.setSecretKey(false); // keys imported from Facebook must be public
+        entry.addOrigin(ORIGIN);
+
+        // so we can query for the Facebook username directly, and to identify the source to
+        // download the key from
+        entry.setFbUsername(fbUsername);
+
+        UncachedPublicKey key = ring.getPublicKey();
+
+        entry.setPrimaryUserId(key.getPrimaryUserIdWithFallback());
+        entry.setUserIds(key.getUnorderedUserIds());
+        entry.updateMergedUserIds();
+
+        entry.setPrimaryUserId(key.getPrimaryUserIdWithFallback());
+
+        entry.setKeyId(key.getKeyId());
+        entry.setKeyIdHex(KeyFormattingUtils.convertKeyIdToHex(key.getKeyId()));
+
+        entry.setFingerprintHex(KeyFormattingUtils.convertFingerprintToHex(key.getFingerprint()));
+
+
+        try {
+            if (key.isEC()) { // unsupported key format (ECDH or ECDSA)
+                Log.e(Constants.TAG, "ECDH/ECDSA key - not supported.");
+                throw new UnsupportedOperationException(
+                        "ECDH/ECDSA keys not supported yet");
+            }
+            entry.setBitStrength(key.getBitStrength());
+            final int algorithm = key.getAlgorithm();
+            entry.setAlgorithm(KeyFormattingUtils.getAlgorithmInfo(algorithm, key.getBitStrength(),
+                    key.getCurveOid()));
+        } catch (NumberFormatException | NullPointerException e) {
+            Log.e(Constants.TAG, "Conversion for bit size, algorithm, or creation date failed.", e);
+            // can't use this key
+            throw new UnsupportedOperationException(
+                    "Conversion for bit size, algorithm, or creation date failed.");
+        }
+
+        return entry;
+    }
+
+    public static String getUsernameFromUri(Uri uri) {
+        // path pattern is /username/publickey/download
+        return uri.getPathSegments().get(0);
+    }
+
+    public static boolean isFacebookHost(Uri uri) {
+        String host = uri.getHost();
+        return host.equalsIgnoreCase(FB_HOST) || host.equalsIgnoreCase(FB_HOST_WWW);
+    }
+}