#3 add basic bitcoin block handler

core/src/main/kotlin/fund/cyber/node/common/Util.kt

@@ -3,4 +3,5 @@ package fund.cyber.node.common
 import java.util.*
 
 fun Deque<String>.intValue(): Int? = first?.toIntOrNull()
+fun Deque<String>.longValue(): Long? = first?.toLongOrNull()
 fun Deque<String>.stringValue(): String? = first

search-api/src/main/kotlin/fund/cyber/search/SearchApiApplication.kt

@@ -1,5 +1,6 @@
 package fund.cyber.search
 
+import fund.cyber.search.handler.BitcoinBlockHandler
 import fund.cyber.search.handler.SearchHandler
 import io.undertow.Handlers
 import io.undertow.Undertow
@@ -12,6 +13,7 @@ object SearchApiApplication {
 
         val httpHandler = Handlers.path()
                 .addPrefixPath("/search", SearchHandler())
+                .addPrefixPath("/bitcoin/block/{blockNumber}", BitcoinBlockHandler())
 
         Undertow.builder()
                 .addHttpListener(8085, "0.0.0.0")

search-api/src/main/kotlin/fund/cyber/search/handler/BitcoinBlockHandler.kt

@@ -0,0 +1,28 @@
+package fund.cyber.search.handler
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import fund.cyber.node.common.longValue
+import fund.cyber.search.context.AppContext
+import io.undertow.server.HttpHandler
+import io.undertow.server.HttpServerExchange
+import io.undertow.util.Headers
+
+class BitcoinBlockHandler(
+        private val jsonSerializer: ObjectMapper = AppContext.jsonSerializer
+) : HttpHandler {
+
+    override fun handleRequest(exchange: HttpServerExchange) {
+
+        val blockNumber = exchange.pathParameters["blockNumber"]?.longValue()
+
+        if (blockNumber == null || blockNumber < 0) {
+            exchange.statusCode = 400
+            return
+        }
+
+        val rawResponse = jsonSerializer.writeValueAsString("""{"block":"$blockNumber"}""")
+
+        exchange.responseHeaders.put(Headers.CONTENT_TYPE, "application/json")
+        exchange.responseSender.send(rawResponse)
+    }
+}