1 files changed, 106 insertions, 0 deletions
diff --git a/src/main/java/org/openintents/openpgp/util/OpenPgpUtils.java b/src/main/java/org/openintents/openpgp/util/OpenPgpUtils.java
new file mode 100644
index 0000000..ef0a88c
--- /dev/null
+++ b/src/main/java/org/openintents/openpgp/util/OpenPgpUtils.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2014-2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openintents.openpgp.util;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.ResolveInfo;
+import android.text.TextUtils;
+
+public class OpenPgpUtils {
+
+    public static final Pattern PGP_MESSAGE = Pattern.compile(
+            ".*?(-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----).*",
+            Pattern.DOTALL);
+
+    public static final Pattern PGP_SIGNED_MESSAGE = Pattern.compile(
+            ".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
+            Pattern.DOTALL);
+
+    public static final int PARSE_RESULT_NO_PGP = -1;
+    public static final int PARSE_RESULT_MESSAGE = 0;
+    public static final int PARSE_RESULT_SIGNED_MESSAGE = 1;
+
+    public static int parseMessage(String message) {
+        Matcher matcherSigned = PGP_SIGNED_MESSAGE.matcher(message);
+        Matcher matcherMessage = PGP_MESSAGE.matcher(message);
+
+        if (matcherMessage.matches()) {
+            return PARSE_RESULT_MESSAGE;
+        } else if (matcherSigned.matches()) {
+            return PARSE_RESULT_SIGNED_MESSAGE;
+        } else {
+            return PARSE_RESULT_NO_PGP;
+        }
+    }
+
+    public static boolean isAvailable(Context context) {
+        Intent intent = new Intent(OpenPgpApi.SERVICE_INTENT);
+        List<ResolveInfo> resInfo = context.getPackageManager().queryIntentServices(intent, 0);
+        return !resInfo.isEmpty();
+    }
+
+    public static String convertKeyIdToHex(long keyId) {
+        return "0x" + convertKeyIdToHex32bit(keyId >> 32) + convertKeyIdToHex32bit(keyId);
+    }
+
+    private static String convertKeyIdToHex32bit(long keyId) {
+        String hexString = Long.toHexString(keyId & 0xffffffffL).toLowerCase(Locale.ENGLISH);
+        while (hexString.length() < 8) {
+            hexString = "0" + hexString;
+        }
+        return hexString;
+    }
+
+    private static final Pattern USER_ID_PATTERN = Pattern.compile("^(.*?)(?: (\\[.*\\]))?(?: \\((.*)\\))?(?: <(.*)>)?$");
+
+    /**
+     * Splits userId string into naming part, email part, and comment part
+     * <p/>
+     * User ID matching:
+     * http://fiddle.re/t4p6f
+     *
+     * @param userId
+     * @return theParsedUserInfo
+     */
+    public static UserInfo splitUserId(final String userId) {
+        if (!TextUtils.isEmpty(userId)) {
+            final Matcher matcher = USER_ID_PATTERN.matcher(userId);
+            if (matcher.matches()) {
+                return new UserInfo(matcher.group(1), matcher.group(4), matcher.group(3));
+            }
+        }
+        return new UserInfo(null, null, null);
+    }
+
+    public static class UserInfo {
+        public final String name;
+        public final String email;
+        public final String comment;
+
+        public UserInfo(String name, String email, String comment) {
+            this.name = name;
+            this.email = email;
+            this.comment = comment;
+        }
+    }
+}