50 lines
1.8 KiB
JavaScript
50 lines
1.8 KiB
JavaScript
/**
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* The public interface of this module exposes the functions as specified by
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* https://github.com/ethereum/consensus-specs/blob/dev/specs/eip4844/polynomial-commitments.md#kzg
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*/
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const fs = require("fs");
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const path = require("path");
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const bindings = require("bindings")("kzg");
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/**
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* Converts JSON formatted trusted setup into the native format that
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* the native library requires. Returns the absolute file path to the
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* the formatted file. The path will be the same as the origin
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* file but with a ".txt" extension.
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*
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* @param {string} filePath - The absolute path of JSON formatted trusted setup
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*
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* @return {string} - The absolute path of the re-formatted trusted setup
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*
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* @throws {Error} - For invalid file operations
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*/
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function transformTrustedSetupJson(filePath) {
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const trustedSetup = JSON.parse(fs.readFileSync(filePath, "utf8"));
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const setupText =
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bindings.FIELD_ELEMENTS_PER_BLOB +
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"\n65\n" +
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trustedSetup.setup_G1_lagrange.map((p) => p.substring(2)).join("\n") +
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"\n" +
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trustedSetup.setup_G2.map((p) => p.substring(2)).join("\n");
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const outputPath = filePath.replace(".json", ".txt");
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fs.writeFileSync(outputPath, setupText);
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return outputPath;
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}
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const originalLoadTrustedSetup = bindings.loadTrustedSetup;
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// docstring in ./kzg.d.ts with exported definition
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bindings.loadTrustedSetup = function loadTrustedSetup(filePath) {
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if (!(filePath && typeof filePath === "string")) {
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throw new TypeError("must initialize kzg with the filePath to a txt/json trusted setup");
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}
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if (!fs.existsSync(filePath)) {
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throw new Error(`no trusted setup found: ${filePath}`);
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}
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if (path.parse(filePath).ext === ".json") {
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filePath = transformTrustedSetupJson(filePath);
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}
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originalLoadTrustedSetup(filePath);
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};
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module.exports = exports = bindings;
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