MSC2140 Add hash configuration.

src/main/java/io/kamax/mxisd/HttpMxisd.java

@@ -54,6 +54,7 @@ import io.kamax.mxisd.http.undertow.handler.identity.share.SignEd25519Handler;
 import io.kamax.mxisd.http.undertow.handler.identity.share.StoreInviteHandler;
 import io.kamax.mxisd.http.undertow.handler.identity.v1.*;
 import io.kamax.mxisd.http.undertow.handler.identity.v2.HashDetailsHandler;
+import io.kamax.mxisd.http.undertow.handler.identity.v2.HashLookupHandler;
 import io.kamax.mxisd.http.undertow.handler.invite.v1.RoomInviteHandler;
 import io.kamax.mxisd.http.undertow.handler.profile.v1.InternalProfileHandler;
 import io.kamax.mxisd.http.undertow.handler.profile.v1.ProfileHandler;

src/main/java/io/kamax/mxisd/config/HashingConfig.java

@@ -3,6 +3,9 @@ package io.kamax.mxisd.config;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class HashingConfig {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(HashingConfig.class);
@@ -12,6 +15,7 @@ public class HashingConfig {
     private RotationPolicyEnum rotationPolicy;
     private HashStorageEnum hashStorageType;
     private long delay = 10;
+    private List<Algorithm> algorithms = new ArrayList<>();
 
     public void build() {
         if (isEnabled()) {
@@ -27,6 +31,11 @@ public class HashingConfig {
         }
     }
 
+    public enum Algorithm {
+        NONE,
+        SHA256
+    }
+
     public enum RotationPolicyEnum {
         PER_REQUESTS,
         PER_SECONDS
@@ -76,4 +85,12 @@ public class HashingConfig {
     public void setDelay(long delay) {
         this.delay = delay;
     }
+
+    public List<Algorithm> getAlgorithms() {
+        return algorithms;
+    }
+
+    public void setAlgorithms(List<Algorithm> algorithms) {
+        this.algorithms = algorithms;
+    }
 }

src/main/java/io/kamax/mxisd/http/undertow/handler/identity/v2/HashDetailsHandler.java

@@ -2,6 +2,7 @@ package io.kamax.mxisd.http.undertow.handler.identity.v2;
 
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
+import io.kamax.mxisd.config.HashingConfig;
 import io.kamax.mxisd.hash.HashManager;
 import io.kamax.mxisd.http.undertow.handler.BasicHttpHandler;
 import io.undertow.server.HttpServerExchange;
@@ -11,7 +12,6 @@ public class HashDetailsHandler extends BasicHttpHandler {
     public static final String PATH = "/_matrix/identity/v2/hash_details";
 
     private final HashManager hashManager;
-    private volatile JsonObject response = null;
 
     public HashDetailsHandler(HashManager hashManager) {
         this.hashManager = hashManager;
@@ -23,20 +23,16 @@ public class HashDetailsHandler extends BasicHttpHandler {
     }
 
     private JsonObject getResponse() {
-        if (response == null) {
+        JsonObject response = new JsonObject();
-            synchronized (this) {
+        response.addProperty("lookup_pepper", hashManager.getHashEngine().getPepper());
-                if (response == null) {
+        JsonArray algorithms = new JsonArray();
-                    response = new JsonObject();
+        HashingConfig config = hashManager.getConfig();
-                    response.addProperty("lookup_pepper", hashManager.getHashEngine().getPepper());
+        if (config.isEnabled()) {
-                    JsonArray algorithms = new JsonArray();
+            for (HashingConfig.Algorithm algorithm : config.getAlgorithms()) {
-                    algorithms.add("none");
+                algorithms.add(algorithm.name().toLowerCase());
-                    if (hashManager.getConfig().isEnabled()) {
-                        algorithms.add("sha256");
-                    }
-                    response.add("algorithms", algorithms);
-                }
             }
         }
+        response.add("algorithms", algorithms);
         return response;
     }
 }

src/main/java/io/kamax/mxisd/http/undertow/handler/identity/v2/HashLookupHandler.java

@@ -18,8 +18,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package io.kamax.mxisd.http.undertow.handler.identity.v1;
+package io.kamax.mxisd.http.undertow.handler.identity.v2;
 
+import io.kamax.mxisd.config.HashingConfig;
 import io.kamax.mxisd.exception.InvalidParamException;
 import io.kamax.mxisd.exception.InvalidPepperException;
 import io.kamax.mxisd.hash.HashManager;
@@ -51,6 +52,7 @@ public class HashLookupHandler extends LookupHandler implements ApiHandler {
 
     public HashLookupHandler(LookupStrategy strategy, HashManager hashManager) {
         this.strategy = strategy;
+        this.hashManager = hashManager;
     }
 
     @Override
@@ -61,6 +63,10 @@ public class HashLookupHandler extends LookupHandler implements ApiHandler {
         log.info("Got bulk lookup request from {} with client {} - Is recursive? {}",
             lookupRequest.getRequester(), lookupRequest.getUserAgent(), lookupRequest.isRecursive());
 
+        if (!hashManager.getConfig().isEnabled()) {
+            throw new InvalidParamException();
+        }
+
         if (!hashManager.getHashEngine().getPepper().equals(input.getPepper())) {
             throw new InvalidPepperException();
         }
@@ -78,6 +84,10 @@ public class HashLookupHandler extends LookupHandler implements ApiHandler {
     }
 
     private void noneAlgorithm(HttpServerExchange exchange, HashLookupRequest request, ClientHashLookupRequest input) throws Exception {
+        if (!hashManager.getConfig().getAlgorithms().contains(HashingConfig.Algorithm.NONE)) {
+            throw new InvalidParamException();
+        }
+
         BulkLookupRequest bulkLookupRequest = new BulkLookupRequest();
         List<ThreePidMapping> mappings = new ArrayList<>();
         for (String address : input.getAddresses()) {
@@ -100,6 +110,10 @@ public class HashLookupHandler extends LookupHandler implements ApiHandler {
     }
 
     private void sha256Algorithm(HttpServerExchange exchange, HashLookupRequest request, ClientHashLookupRequest input) {
+        if (!hashManager.getConfig().getAlgorithms().contains(HashingConfig.Algorithm.SHA256)) {
+            throw new InvalidParamException();
+        }
+
         ClientHashLookupAnswer answer = new ClientHashLookupAnswer();
         for (Pair<String, ThreePidMapping> pair : hashManager.getHashStorage().find(request.getHashes())) {
             answer.getMappings().put(pair.getKey(), pair.getValue().getMxid());