get alias for pubkey via REST controller

application/src/main/java/de/cotto/lndmanagej/controller/NodeController.java

@@ -0,0 +1,23 @@
+package de.cotto.lndmanagej.controller;
+
+import de.cotto.lndmanagej.grpc.GrpcNodeInfo;
+import de.cotto.lndmanagej.model.Pubkey;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/node/")
+public class NodeController {
+    private final GrpcNodeInfo grpcNodeInfo;
+
+    public NodeController(GrpcNodeInfo grpcNodeInfo) {
+        this.grpcNodeInfo = grpcNodeInfo;
+    }
+
+    @GetMapping("/{pubkey}/alias")
+    public String getAlias(@PathVariable Pubkey pubkey) {
+        return grpcNodeInfo.getNode(pubkey).alias();
+    }
+}

application/src/main/java/de/cotto/lndmanagej/controller/PubkeyConverter.java

@@ -0,0 +1,19 @@
+package de.cotto.lndmanagej.controller;
+
+import de.cotto.lndmanagej.model.Pubkey;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.Nonnull;
+
+@Component
+public class PubkeyConverter implements Converter<String, Pubkey> {
+    public PubkeyConverter() {
+        // default constructor
+    }
+
+    @Override
+    public Pubkey convert(@Nonnull String source) {
+        return Pubkey.create(source);
+    }
+}