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Merge pull request #76 from icerockdev/develop
Release 0.13.0
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125 changes: 125 additions & 0 deletions
125
web3/src/commonMain/kotlin/dev.icerock.moko.web3/contract/MethodEncoder.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| * Copyright 2021 IceRock MAG Inc. Use of this source code is governed by the Apache 2.0 license. | ||
| */ | ||
|
|
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| package dev.icerock.moko.web3.contract | ||
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| import com.soywiz.kbignum.bi | ||
| import dev.icerock.moko.web3.crypto.KeccakParameter | ||
| import dev.icerock.moko.web3.crypto.digestKeccak | ||
| import dev.icerock.moko.web3.crypto.toHex | ||
| import io.ktor.utils.io.core.toByteArray | ||
| import kotlinx.serialization.json.JsonArray | ||
| import kotlinx.serialization.json.JsonElement | ||
| import kotlinx.serialization.json.JsonObject | ||
| import kotlinx.serialization.json.contentOrNull | ||
| import kotlinx.serialization.json.jsonArray | ||
| import kotlinx.serialization.json.jsonObject | ||
| import kotlinx.serialization.json.jsonPrimitive | ||
|
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| object MethodEncoder { | ||
| @Suppress("UNCHECKED_CAST") | ||
| private fun <T> Encoder<T>.encodeUnchecked(value: Any) = encode(value as T) | ||
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| fun createCallData(abi: JsonArray, method: String, params: List<Any>): String { | ||
| val methodAbi: JsonObject = abi.map { it.jsonObject } | ||
| .firstOrNull { it["name"]?.jsonPrimitive?.contentOrNull == method } | ||
| ?: throw AbiMethodNotFoundException(method, abi) | ||
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| val inputParams: List<JsonObject> = | ||
| methodAbi.getValue(key = "inputs").jsonArray.map { it.jsonObject } | ||
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| val methodSignature: ByteArray = generateMethodSignature(method, inputParams) | ||
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| val data = methodSignature + encodeParams(inputParams, params) | ||
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| return "0x" + data.toHex().lowercase() | ||
| } | ||
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| fun encodeParams(inputParams: List<JsonObject>, params: List<Any>): ByteArray { | ||
| val paramsEncoders = params.indices | ||
| .map { index -> | ||
| val param = inputParams[index] | ||
| val paramName = param.getValue(key = "type").jsonPrimitive.content | ||
| return@map param to paramName | ||
| }.map { (param, typeAnnotation) -> resolveEncoderForType(param, typeAnnotation) } | ||
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| val headPartiallyEncoded = paramsEncoders | ||
| .zip(params) | ||
| .map { (encoder, param) -> | ||
| when(encoder) { | ||
| is StaticEncoder<*> -> EncodedPart.StaticPart(encoder.encodeUnchecked(param)) | ||
| is DynamicEncoder<*> -> EncodedPart.DynamicPart(encoder.encodeUnchecked(param)) | ||
| } | ||
| } | ||
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| val dynamicPartsSizes = headPartiallyEncoded | ||
| .runningFold(initial = headPartiallyEncoded.size * PART_SIZE) { acc: Int, encodedPart: EncodedPart -> | ||
| when(encodedPart) { | ||
| is EncodedPart.DynamicPart -> acc + encodedPart.encoded.size | ||
| is EncodedPart.StaticPart -> acc | ||
| } | ||
| } | ||
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| val headEncoded = headPartiallyEncoded | ||
| .mapIndexed { index, encodedPart -> | ||
| if(encodedPart is EncodedPart.StaticPart) | ||
| encodedPart.encoded | ||
| else | ||
| UInt256Param.encode(dynamicPartsSizes[index].bi) | ||
| }.fold(byteArrayOf()) { acc, part -> acc + part } | ||
|
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| val dynamicPartEncoded = headPartiallyEncoded | ||
| .filterIsInstance<EncodedPart.DynamicPart>() | ||
| .fold(byteArrayOf()) { acc, part -> acc + part.encoded } | ||
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| return headEncoded + dynamicPartEncoded | ||
| } | ||
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| private val listTypeRegex = Regex("(.*)\\[]") | ||
| private fun resolveEncoderForType(param: JsonObject, typeAnnotation: String) = when { | ||
| typeAnnotation.matches(listTypeRegex) -> { | ||
| val (subtypeAnnotation) = listTypeRegex.find(typeAnnotation)!!.destructured | ||
| ListParam(StaticEncoders.forType(subtypeAnnotation).encoder) | ||
| } | ||
| typeAnnotation == "tuple" -> TupleParam(param) | ||
| else -> StaticEncoders.forType(typeAnnotation).encoder | ||
| } | ||
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| @OptIn(ExperimentalStdlibApi::class) | ||
| private fun generateMethodSignature( | ||
| method: String, | ||
| inputParams: List<JsonObject> | ||
| ): ByteArray { | ||
| val signature = "$method(${generateParamsString(inputParams)})".toByteArray() | ||
| return signature.digestKeccak(KeccakParameter.KECCAK_256).sliceArray(0..3) | ||
| } | ||
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| private fun generateParamsString(inputParams: List<JsonObject>): String = buildString { | ||
| inputParams.forEachIndexed { index, param -> | ||
| if (index != 0) append(",") | ||
| append(stringifyType(param, param.getValue(key = "type").jsonPrimitive.content)) | ||
| } | ||
| } | ||
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| private fun stringifyType(param: JsonObject, typeAnnotation: String) = when (typeAnnotation) { | ||
| "tuple" -> { | ||
| val components = param.getValue(key = "components").jsonArray.map(JsonElement::jsonObject) | ||
| "(${generateParamsString(components)})" | ||
| } | ||
| else -> typeAnnotation | ||
| } | ||
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| internal const val PART_SIZE = 32 | ||
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| /** | ||
| * First iteration while encoding is an iteration when all static params encoded, | ||
| * while dynamic params replaced with DynamicPass, later it is being replaced with encoded | ||
| * dynamic params | ||
| */ | ||
| private sealed interface EncodedPart { | ||
| val encoded: ByteArray | ||
| class DynamicPart(override val encoded: ByteArray) : EncodedPart | ||
| class StaticPart(override val encoded: ByteArray) : EncodedPart | ||
| } | ||
| } |
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22 changes: 22 additions & 0 deletions
22
web3/src/commonMain/kotlin/dev.icerock.moko.web3/contract/TupleParam.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| /* | ||
| * Copyright 2021 IceRock MAG Inc. Use of this source code is governed by the Apache 2.0 license. | ||
| */ | ||
|
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| package dev.icerock.moko.web3.contract | ||
|
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| import kotlinx.serialization.json.JsonElement | ||
| import kotlinx.serialization.json.JsonObject | ||
| import kotlinx.serialization.json.jsonArray | ||
| import kotlinx.serialization.json.jsonObject | ||
|
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| class TupleParam(val param: JsonObject) : DynamicEncoder<List<Any>> { | ||
| override fun encode(item: List<Any>): ByteArray { | ||
| val components = param.getValue(key = "components") | ||
| .jsonArray.map(JsonElement::jsonObject) | ||
| return MethodEncoder.encodeParams(components, item) | ||
| } | ||
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| override fun decode(source: ByteArray): List<Any> { | ||
| TODO("moko-web3 does not support decoding dynamic params yet") | ||
| } | ||
| } |
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