Further reduce dependencies on a Sone for downloading.
[Sone.git] / src / main / java / net / pterodactylus / sone / freenet / Key.java
diff --git a/src/main/java/net/pterodactylus/sone/freenet/Key.java b/src/main/java/net/pterodactylus/sone/freenet/Key.java
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+package net.pterodactylus.sone.freenet;
+
+import static freenet.support.Base64.encode;
+import static java.lang.String.format;
+
+import freenet.keys.FreenetURI;
+
+import com.google.common.annotations.VisibleForTesting;
+
+/**
+ * Encapsulates the parts of a {@link FreenetURI} that do not change while
+ * being converted from SSK to USK and/or back.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class Key {
+
+       private final byte[] routingKey;
+       private final byte[] cryptoKey;
+       private final byte[] extra;
+
+       private Key(byte[] routingKey, byte[] cryptoKey, byte[] extra) {
+               this.routingKey = routingKey;
+               this.cryptoKey = cryptoKey;
+               this.extra = extra;
+       }
+
+       @VisibleForTesting
+       public String getRoutingKey() {
+               return encode(routingKey);
+       }
+
+       @VisibleForTesting
+       public String getCryptoKey() {
+               return encode(cryptoKey);
+       }
+
+       @VisibleForTesting
+       public String getExtra() {
+               return encode(extra);
+       }
+
+       public FreenetURI toUsk(String docName, long edition, String... paths) {
+               return new FreenetURI("USK", docName, paths, routingKey, cryptoKey,
+                               extra, edition);
+       }
+
+       public FreenetURI toSsk(String docName, String... paths) {
+               return new FreenetURI("SSK", docName, paths, routingKey, cryptoKey,
+                               extra);
+       }
+
+       public FreenetURI toSsk(String docName, long edition, String... paths) {
+               return new FreenetURI("SSK", format("%s-%d", docName, edition), paths,
+                               routingKey, cryptoKey, extra, edition);
+       }
+
+       public static Key from(FreenetURI freenetURI) {
+               return new Key(freenetURI.getRoutingKey(), freenetURI.getCryptoKey(),
+                               freenetURI.getExtra());
+       }
+
+       public static String routingKey(FreenetURI freenetURI) {
+               return from(freenetURI).getRoutingKey();
+       }
+
+}