chore: increase meta size to 64 bytes + tests (#1629)

tests/v2/test_waku_message_digest.nim

@@ -1,9 +1,12 @@
 {.used.}
 
 import
+  std/sequtils,
   stew/byteutils,
   testutils/unittests
 import
+  ../../waku/v2/protocol/waku_message,
+  ../../waku/v2/protocol/waku_message/codec,
   ../../waku/v2/protocol/waku_message/digest,
   ./testlib/waku2
 
@@ -32,6 +35,10 @@ suite "Waku Message - Deterministic hashing":
 
     ## Then
     check:
+      byteutils.toHex(pubsubTopic.toBytes()) == "2f77616b752f322f64656661756c742d77616b752f70726f746f"
+      byteutils.toHex(message.contentTopic.toBytes()) == "2f77616b752f322f64656661756c742d636f6e74656e742f70726f746f"
+      byteutils.toHex(message.payload) == "010203045445535405060708"
+      byteutils.toHex(message.meta) == ""
       messageHash.toHex() == "87619d05e563521d9126749b45bd4cc2430df0607e77e23572d874ed9c1aaa62"
 
   test "digest computation - meta field (12 bytes)":
@@ -57,8 +64,41 @@ suite "Waku Message - Deterministic hashing":
 
     ## Then
     check:
+      byteutils.toHex(pubsubTopic.toBytes()) == "2f77616b752f322f64656661756c742d77616b752f70726f746f"
+      byteutils.toHex(message.contentTopic.toBytes()) == "2f77616b752f322f64656661756c742d636f6e74656e742f70726f746f"
+      byteutils.toHex(message.payload) == "010203045445535405060708"
+      byteutils.toHex(message.meta) == "73757065722d736563726574"
       messageHash.toHex() == "4fdde1099c9f77f6dae8147b6b3179aba1fc8e14a7bf35203fc253ee479f135f"
 
+  test "digest computation - meta field (64 bytes)":
+    ## Test vector:
+    ##
+    ##  pubsub_topic = 0x2f77616b752f322f64656661756c742d77616b752f70726f746f
+    ##  waku_message.payload = 0x010203045445535405060708
+    ##  waku_message.content_topic = 0x2f77616b752f322f64656661756c742d636f6e74656e742f70726f746f
+    ##  waku_message.meta = 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f
+    ##
+    ##  message_hash = 0xc32ed3b51f0c432be1c7f50880110e1a1a60f6067cd8193ca946909efe1b26ad
+
+    ## Given
+    let pubsubTopic = DefaultPubsubTopic  # /waku/2/default-waku/proto
+    let message = fakeWakuMessage(
+      contentTopic = DefaultContentTopic,  # /waku/2/default-content/proto
+      payload = "\x01\x02\x03\x04TEST\x05\x06\x07\x08".toBytes(),
+      meta = toSeq(0.byte..63.byte)
+    )
+
+    ## When
+    let messageHash = digest(pubsubTopic, message)
+
+    ## Then
+    check:
+      byteutils.toHex(pubsubTopic.toBytes()) == "2f77616b752f322f64656661756c742d77616b752f70726f746f"
+      byteutils.toHex(message.contentTopic.toBytes()) == "2f77616b752f322f64656661756c742d636f6e74656e742f70726f746f"
+      byteutils.toHex(message.payload) == "010203045445535405060708"
+      byteutils.toHex(message.meta) == "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"
+      messageHash.toHex() == "c32ed3b51f0c432be1c7f50880110e1a1a60f6067cd8193ca946909efe1b26ad"
+
   test "digest computation - zero length payload":
     ## Test vector:
     ##
@@ -83,3 +123,18 @@ suite "Waku Message - Deterministic hashing":
     ## Then
     check:
       messageHash.toHex() == "e1a9596237dbe2cc8aaf4b838c46a7052df6bc0d42ba214b998a8bfdbe8487d6"
+
+  test "waku message - check meta size is enforced":
+    # create message with meta size > 64 bytes (invalid)
+    let message = fakeWakuMessage(
+      contentTopic = DefaultContentTopic,
+      payload = "\x01\x02\x03\x04TEST\x05\x06\x07\x08".toBytes(),
+      meta = toSeq(0.byte..66.byte) # 67 bytes
+    )
+
+    let encodedInvalidMsg = message.encode
+    let decoded = WakuMessage.decode(encodedInvalidMsg.buffer)
+
+    check:
+      decoded.isErr == true
+      $decoded.error == "(kind: InvalidLengthField, field: \"meta\")"

waku/v2/protocol/waku_message/message.nim

@@ -14,7 +14,7 @@ import
   ./topics
 
 const
-  MaxMetaAttrLength* = 32 # 32 bytes
+  MaxMetaAttrLength* = 64 # 64 bytes
 
   MaxWakuMessageSize* = 1024 * 1024 # 1 Mibytes. Corresponds to PubSub default