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56 lines
1.6 KiB
Nim
56 lines
1.6 KiB
Nim
when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import
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std/options,
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stew/[byteutils, results],
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libp2p/crypto/crypto
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import
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../../waku/v1/protocol/waku_protocol,
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../../waku/v2/waku_core
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const
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ContentTopicApplication = "waku"
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ContentTopicAppVersion = "1"
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proc toV1Topic*(contentTopic: ContentTopic): waku_protocol.Topic {.raises: [ValueError]} =
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## Extracts the 4-byte array v1 topic from a content topic
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## with format `/waku/1/<v1-topic-bytes-as-hex>/rfc26`
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let ns = NsContentTopic.parse(contentTopic)
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if ns.isErr():
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let err = ns.tryError()
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raise newException(ValueError, $err)
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let name = ns.value.name
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hexToByteArray(hexStr=name, N=4) # Byte array length
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proc toV2ContentTopic*(v1Topic: waku_protocol.Topic): ContentTopic =
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## Convert a 4-byte array v1 topic to a namespaced content topic
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## with format `/waku/1/<v1-topic-bytes-as-hex>/rfc26`
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##
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## <v1-topic-bytes-as-hex> should be prefixed with `0x`
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var namespacedTopic = NsContentTopic()
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namespacedTopic.generation = none(int)
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namespacedTopic.bias = Unbiased
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namespacedTopic.application = ContentTopicApplication
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namespacedTopic.version = ContentTopicAppVersion
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namespacedTopic.name = v1Topic.to0xHex()
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namespacedTopic.encoding = "rfc26"
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return ContentTopic($namespacedTopic)
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proc isBridgeable*(msg: WakuMessage): bool =
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## Determines if a Waku v2 msg is on a bridgeable content topic
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let ns = NsContentTopic.parse(msg.contentTopic)
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if ns.isErr():
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return false
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return ns.value.application == ContentTopicApplication and ns.value.version == ContentTopicAppVersion
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