Bye bye Groovy, you won't be missed :(

src/main/java/io/kamax/mxisd/controller/v1/KeyController.java

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.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.mxisd.controller.v1;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import io.kamax.mxisd.controller.v1.io.KeyValidityJson;
+import io.kamax.mxisd.exception.BadRequestException;
+import io.kamax.mxisd.key.KeyManager;
+import org.apache.commons.lang.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.*;
+
+import javax.servlet.http.HttpServletRequest;
+
+import static org.springframework.web.bind.annotation.RequestMethod.GET;
+
+@RestController
+@CrossOrigin
+@RequestMapping(path = IdentityAPIv1.BASE, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
+public class KeyController {
+
+    private Logger log = LoggerFactory.getLogger(KeyController.class);
+
+    @Autowired
+    private KeyManager keyMgr;
+
+    private Gson gson = new Gson();
+    private String validKey = gson.toJson(new KeyValidityJson(true));
+    private String invalidKey = gson.toJson(new KeyValidityJson(false));
+
+    @RequestMapping(value = "/pubkey/{keyType}:{keyId}", method = GET)
+    public String getKey(@PathVariable String keyType, @PathVariable int keyId) {
+        if (!"ed25519".contentEquals(keyType)) {
+            throw new BadRequestException("Invalid algorithm: " + keyType);
+        }
+
+        log.info("Key {}:{} was requested", keyType, keyId);
+        JsonObject obj = new JsonObject();
+        obj.addProperty("public_key", keyMgr.getPublicKeyBase64(keyId));
+        return gson.toJson(obj);
+    }
+
+    @RequestMapping(value = "/pubkey/ephemeral/isvalid", method = GET)
+    public String checkEphemeralKeyValidity(HttpServletRequest request) {
+        log.warn("Ephemeral key was request but no ephemeral key are generated, replying not valid");
+
+        return invalidKey;
+    }
+
+    @RequestMapping(value = "/pubkey/isvalid", method = GET)
+    public String checkKeyValidity(HttpServletRequest request, @RequestParam("public_key") String pubKey) {
+        log.info("Validating public key {}", pubKey);
+
+        // TODO do in manager
+        boolean valid = StringUtils.equals(pubKey, keyMgr.getPublicKeyBase64(keyMgr.getCurrentIndex()));
+        return valid ? validKey : invalidKey;
+    }
+
+}