Reject messages with payload size > 1MiB

- Update validation in WireFrameDecoder class
- Write unit and component tests for that case

Closes ONAP-340

Change-Id: I68cb608fd76118719b12a83de1ef930160f8a162
Signed-off-by: Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
Issue-ID: DCAEGEN2-601

3 files changed, 63 insertions, 7 deletions

diff --git a/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/codec.kt b/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/codec.kt
index 22767ed3..39841d6a 100644
--- a/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/codec.kt
+++ b/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/codec.kt
@@ -52,9 +52,9 @@ class WireFrameDecoder {
 
     fun decodeFirst(byteBuf: ByteBuf): Either<WireFrameDecodingError, WireFrame> =
             when {
-                isEmpty(byteBuf)          -> Left(EmptyWireFrame)
+                isEmpty(byteBuf) -> Left(EmptyWireFrame)
                 headerDoesNotFit(byteBuf) -> Left(MissingWireFrameHeaderBytes)
-                else                      -> parseFrame(byteBuf)
+                else -> parseFrame(byteBuf)
             }
 
     private fun headerDoesNotFit(byteBuf: ByteBuf) = byteBuf.readableBytes() < WireFrame.HEADER_SIZE
@@ -74,6 +74,11 @@ class WireFrameDecoder {
         val payloadTypeRaw = byteBuf.readUnsignedByte()
 
         val payloadSize = byteBuf.readInt()
+
+        if (payloadSize > MAX_PAYLOAD_SIZE) {
+            return Left(PayloadSizeExceeded)
+        }
+
         if (byteBuf.readableBytes() < payloadSize) {
             byteBuf.resetReaderIndex()
             return Left(MissingWireFramePayloadBytes)
@@ -83,4 +88,8 @@ class WireFrameDecoder {
 
         return Right(WireFrame(payload, version, payloadTypeRaw, payloadSize))
     }
+
+    companion object {
+        const val MAX_PAYLOAD_SIZE = 1024 * 1024
+    }
 }
diff --git a/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/errors.kt b/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/errors.kt
index fb225202..626bf329 100644
--- a/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/errors.kt
+++ b/hv-collector-domain/src/main/kotlin/org/onap/dcae/collectors/veshv/domain/errors.kt
@@ -19,6 +19,8 @@
  */
 package org.onap.dcae.collectors.veshv.domain
 
+import org.onap.dcae.collectors.veshv.domain.WireFrameDecoder.Companion.MAX_PAYLOAD_SIZE
+
 /**
  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
  * @since June 2018
@@ -35,6 +37,7 @@ class InvalidWireFrameMarker(actualMarker: Short)
     : InvalidWireFrame(
         "Invalid start of frame. Expected 0x%02X, but was 0x%02X".format(WireFrame.MARKER_BYTE, actualMarker))
 
+object PayloadSizeExceeded : InvalidWireFrame("payload size exceeds the limit ($MAX_PAYLOAD_SIZE bytes)")
 
 // Missing bytes errors
 
diff --git a/hv-collector-domain/src/test/kotlin/org/onap/dcae/collectors/veshv/domain/WireFrameCodecsTest.kt b/hv-collector-domain/src/test/kotlin/org/onap/dcae/collectors/veshv/domain/WireFrameCodecsTest.kt
index a97d889c..4d6f0716 100644
--- a/hv-collector-domain/src/test/kotlin/org/onap/dcae/collectors/veshv/domain/WireFrameCodecsTest.kt
+++ b/hv-collector-domain/src/test/kotlin/org/onap/dcae/collectors/veshv/domain/WireFrameCodecsTest.kt
@@ -30,7 +30,9 @@ import org.jetbrains.spek.api.Spek
 import org.jetbrains.spek.api.dsl.describe
 import org.jetbrains.spek.api.dsl.given
 import org.jetbrains.spek.api.dsl.it
+import org.onap.dcae.collectors.veshv.domain.WireFrameDecoder.Companion.MAX_PAYLOAD_SIZE
 import java.nio.charset.Charset
+import kotlin.test.assertTrue
 
 /**
  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
@@ -153,7 +155,7 @@ object WireFrameCodecsTest : Spek({
                 assertThat(buff.readableBytes()).isEqualTo(1)
             }
 
-            it("should throw exception when not even header fits") {
+            it("should return error when not even header fits") {
                 val buff = Unpooled.buffer()
                         .writeByte(0xFF)
 
@@ -161,7 +163,7 @@ object WireFrameCodecsTest : Spek({
 
             }
 
-            it("should throw exception when first byte is not 0xFF but length looks ok") {
+            it("should return error when first byte is not 0xFF but length looks ok") {
                 val buff = Unpooled.buffer()
                         .writeByte(0xAA)
                         .writeBytes("some garbage".toByteArray())
@@ -169,14 +171,14 @@ object WireFrameCodecsTest : Spek({
                 decoder.decodeFirst(buff).assertFailedWithError { it.isInstanceOf(InvalidWireFrameMarker::class.java) }
             }
 
-            it("should throw exception when first byte is not 0xFF and length is to short") {
+            it("should return error when first byte is not 0xFF and length is to short") {
                 val buff = Unpooled.buffer()
                         .writeByte(0xAA)
 
                 decoder.decodeFirst(buff).assertFailedWithError { it.isInstanceOf(MissingWireFrameHeaderBytes::class.java) }
             }
 
-            it("should throw exception when payload doesn't fit") {
+            it("should return error when payload doesn't fit") {
                 val buff = Unpooled.buffer()
                         .writeBytes(encodeSampleFrame())
                 buff.writerIndex(buff.writerIndex() - 2)
@@ -185,8 +187,50 @@ object WireFrameCodecsTest : Spek({
             }
 
         }
-    }
 
+        describe("payload size limit"){
+
+            it("should decode successfully when payload size is equal 1 MiB") {
+
+                val payload = ByteArray(MAX_PAYLOAD_SIZE)
+                val input = WireFrame(
+                        payload = ByteData(payload),
+                        version = 1,
+                        payloadTypeRaw = PayloadContentType.GOOGLE_PROTOCOL_BUFFER.hexValue,
+                        payloadSize = payload.size)
+
+
+                assertTrue(decoder.decodeFirst(encoder.encode(input)).isRight())
+            }
+
+            it("should return error when payload exceeds 1 MiB") {
+
+                val payload = ByteArray(MAX_PAYLOAD_SIZE + 1)
+                val input = WireFrame(
+                        payload = ByteData(payload),
+                        version = 1,
+                        payloadTypeRaw = PayloadContentType.GOOGLE_PROTOCOL_BUFFER.hexValue,
+                        payloadSize = payload.size)
+
+
+                decoder.decodeFirst(encoder.encode(input))
+                        .assertFailedWithError { it.isInstanceOf(PayloadSizeExceeded::class.java) }
+            }
+
+            it("should validate only first message") {
+
+                val payload = ByteArray(MAX_PAYLOAD_SIZE)
+                val input = WireFrame(
+                        payload = ByteData(payload),
+                        version = 1,
+                        payloadTypeRaw = PayloadContentType.GOOGLE_PROTOCOL_BUFFER.hexValue,
+                        payloadSize = payload.size)
+
+
+                assertTrue(decoder.decodeFirst(encoder.encode(input).writeByte(0xFF)).isRight())
+            }
+        }
+    }
 })
 
 private fun <A, B> Either<A, B>.assertFailedWithError(assertj: (ObjectAssert<A>) -> Unit) {