Merge the matrix-java-sdk due to it no longer maintained. Remove thirdparty repositories.

src/main/java/io/kamax/matrix/MatrixIdCodec.java

@@ -0,0 +1,93 @@
+/*
+ * matrix-java-sdk - Matrix Client SDK for Java
+ * Copyright (C) 2018 Kamax Sarl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.matrix;
+
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+
+import java.nio.charset.StandardCharsets;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static io.kamax.matrix.MatrixID.ALLOWED_CHARS;
+
+public class MatrixIdCodec {
+
+    public static final String DELIMITER = "=";
+    public static final String ENCODE_REGEX = "[^" + ALLOWED_CHARS + "]+";
+    public static final Pattern ENCODE_PATTERN = Pattern.compile(ENCODE_REGEX);
+    public static final Pattern DECODE_PATTERN = Pattern.compile("(=[0-9a-f]{2})+");
+
+    private MatrixIdCodec() {
+        // not for public consumption
+    }
+
+    public static String encode(String decoded) {
+        decoded = decoded.toLowerCase();
+
+        StringBuilder builder = new StringBuilder();
+        for (Character c : decoded.toCharArray()) {
+            String s = c.toString();
+            Matcher lp = ENCODE_PATTERN.matcher(s);
+            if (!lp.find()) {
+                builder.append(s);
+            } else {
+                for (byte b : c.toString().getBytes(StandardCharsets.UTF_8)) {
+                    builder.append(DELIMITER);
+                    builder.append(Hex.encodeHexString(new byte[] { b }));
+                }
+            }
+        }
+
+        return builder.toString();
+    }
+
+    public static String decode(String encoded) {
+        StringBuilder builder = new StringBuilder();
+
+        Matcher m = DECODE_PATTERN.matcher(encoded);
+        int prevEnd = 0;
+        while (m.find()) {
+            try {
+                int start = m.start();
+                int end = m.end();
+                String sub = encoded.substring(start, end).replaceAll(DELIMITER, "");
+                String decoded = new String(Hex.decodeHex(sub.toCharArray()), StandardCharsets.UTF_8);
+                builder.append(encoded, prevEnd, start);
+                builder.append(decoded);
+                prevEnd = end - 1;
+            } catch (DecoderException e) {
+                e.printStackTrace();
+            }
+        }
+        prevEnd++;
+        if (prevEnd < encoded.length()) {
+            builder.append(encoded, prevEnd, encoded.length());
+        }
+
+        if (builder.length() == 0) {
+            return encoded;
+        } else {
+            return builder.toString();
+        }
+    }
+
+}