pezkuwi-api/packages/merkleize-metadata/dist/esm/main.mjs

import { Blake3256, compact, u32 } from '@pezkuwi/bizinikiwi-bindings';
import { lookupType, extrinsicDec, extrinsicMetadata, metadataDigest, extraInfo } from './codecs.mjs';
import { getAccessibleTypes } from './get-accessible-types.mjs';
import { getLookup } from './get-lookup.mjs';
import { getMetadata } from './get-metadata.mjs';
import { compactTypeRefs, toBytes } from './utils.mjs';
import { decodeAndCollectKnownLeafs } from './decode-and-collect.mjs';
import { getProofData } from './proof.mjs';
import { getDynamicBuilder, getLookupFn } from '@pezkuwi/metadata-builders';
import { mergeUint8 } from '@pezkuwi/papi-utils';

const assertExpected = (name, expected, received) => {
  if (received != null && received !== expected)
    throw new Error(
      `${name} not expected. Received ${received} expected ${expected}`
    );
};
const merkleizeMetadata = (metadataBytes, {
  decimals,
  tokenSymbol,
  ...hinted
}) => {
  const metadata = getMetadata(metadataBytes);
  const checkedVersion = metadata.extrinsic.version.includes(4) ? 4 : null;
  if (checkedVersion == null) throw new Error("Only extrinsic v4 is supported");
  const { ss58Prefix, buildDefinition } = getDynamicBuilder(
    getLookupFn(metadata)
  );
  if (ss58Prefix == null) throw new Error("SS58 prefix not found in metadata");
  assertExpected("SS58 prefix", ss58Prefix, hinted.base58Prefix);
  const version = metadata.pallets.find((x) => x.name === "System")?.constants.find((x) => x.name === "Version");
  if (version == null) throw new Error("System.Version constant not found");
  const { spec_name: specName, spec_version: specVersion } = buildDefinition(
    version.type
  ).dec(version.value);
  if (typeof specName !== "string" || typeof specVersion !== "number")
    throw new Error("Spec name or spec version not found");
  assertExpected("Spec name", specName, hinted.specName);
  assertExpected("Spec version", specVersion, hinted.specVersion);
  const info = {
    decimals,
    tokenSymbol,
    specVersion,
    specName,
    base58Prefix: ss58Prefix
  };
  const definitions = new Map(
    metadata.lookup.map((value) => [value.id, value])
  );
  const accessibleTypes = getAccessibleTypes(metadata, definitions);
  const getPrimitive = (frameId) => {
    const {
      def: { tag, value }
    } = definitions.get(frameId);
    if (tag === "primitive") return value.tag;
    if (tag !== "composite" && tag !== "tuple" || value.length > 1)
      throw new Error("The provided definition doesn't map to a primitive");
    return value.length === 0 ? null : getPrimitive(tag === "tuple" ? value[0] : value[0].type);
  };
  const getTypeRef = (frameId) => {
    const { def } = definitions.get(frameId);
    if (def.tag === "primitive") return { tag: def.value.tag, value: void 0 };
    if (def.tag === "compact") {
      const primitive = getPrimitive(def.value);
      const tag = compactTypeRefs[primitive];
      if (!tag) throw new Error("Invalid primitive for Compact");
      return { tag, value: void 0 };
    }
    return accessibleTypes.has(frameId) ? { tag: "perId", value: accessibleTypes.get(frameId) } : { tag: "void", value: void 0 };
  };
  const extrinsic = {
    version: checkedVersion,
    addressTy: getTypeRef(metadata.extrinsic.address),
    callTy: getTypeRef(metadata.extrinsic.call),
    signatureTy: getTypeRef(metadata.extrinsic.signature),
    signedExtensions: metadata.extrinsic.signedExtensions.map((se) => ({
      identifier: se.identifier,
      includedInExtrinsic: getTypeRef(se.type),
      includedInSignedData: getTypeRef(se.additionalSigned)
    }))
  };
  const lookup = getLookup(
    definitions,
    accessibleTypes,
    getTypeRef,
    getPrimitive
  );
  const lookupEncoded = lookup.map(lookupType.enc);
  let hashTree;
  const getHashTree = () => {
    if (hashTree) return hashTree;
    if (!lookupEncoded.length) return hashTree = [new Uint8Array(32).fill(0)];
    hashTree = new Array(lookupEncoded.length * 2 - 1);
    let leavesStartIdx = lookupEncoded.length - 1;
    for (let i = 0; i < lookupEncoded.length; i++)
      hashTree[leavesStartIdx + i] = Blake3256(lookupEncoded[i]);
    for (let i = hashTree.length - 2; i > 0; i -= 2)
      hashTree[(i - 1) / 2] = Blake3256(
        mergeUint8([hashTree[i], hashTree[i + 1]])
      );
    return hashTree;
  };
  let digested;
  const digest = () => {
    if (digested) return digested;
    const rootLookupHash = getHashTree()[0];
    const digest2 = {
      tag: "V1",
      value: {
        typeInformationTreeRoot: rootLookupHash,
        extrinsicMetadataHash: Blake3256(extrinsicMetadata.enc(extrinsic)),
        ...info
      }
    };
    return digested = Blake3256(metadataDigest.enc(digest2));
  };
  const generateProof = (knownIndexes) => {
    const proofData = getProofData(lookupEncoded, knownIndexes);
    const hashTree2 = getHashTree();
    const proofs = proofData.proofIdxs.map((idx) => hashTree2[idx]);
    return mergeUint8([
      compact.enc(proofData.leaves.length),
      ...proofData.leaves,
      compact.enc(proofData.leafIdxs.length),
      ...proofData.leafIdxs.map((x) => u32.enc(x)),
      compact.enc(proofs.length),
      ...proofs,
      extrinsicMetadata.enc(extrinsic),
      extraInfo.enc(info)
    ]);
  };
  const getProofForExtrinsicPayload = (extrinsicPayload) => {
    const typeRefs = [
      extrinsic.callTy,
      ...extrinsic.signedExtensions.map((x) => x.includedInExtrinsic),
      ...extrinsic.signedExtensions.map((x) => x.includedInSignedData)
    ];
    return generateProof(
      decodeAndCollectKnownLeafs(extrinsicPayload, typeRefs, lookup)
    );
  };
  const getProofForExtrinsicParts = (callData, includedInExtrinsic, includedInSignedData) => {
    const bytes = mergeUint8(
      [callData, includedInExtrinsic, includedInSignedData].map(toBytes)
    );
    return getProofForExtrinsicPayload(bytes);
  };
  const getProofForExtrinsic = (transaction, txAdditionalSigned) => {
    let [, { version: version2, type }, bytes] = extrinsicDec(transaction);
    if (version2 !== extrinsic.version)
      throw new Error("Incorrect extrinsic version");
    const typeRefs = type === "signed" ? [
      extrinsic.addressTy,
      extrinsic.signatureTy,
      ...extrinsic.signedExtensions.map((x) => x.includedInExtrinsic),
      extrinsic.callTy
    ] : [extrinsic.callTy];
    if (txAdditionalSigned) {
      bytes = mergeUint8([bytes, toBytes(txAdditionalSigned)]);
      typeRefs.push(
        ...extrinsic.signedExtensions.map((x) => x.includedInSignedData)
      );
    }
    return generateProof(decodeAndCollectKnownLeafs(bytes, typeRefs, lookup));
  };
  return {
    digest,
    getProofForExtrinsic,
    getProofForExtrinsicParts,
    getProofForExtrinsicPayload
  };
};

export { merkleizeMetadata };
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