66 lines
1.4 KiB
TypeScript
66 lines
1.4 KiB
TypeScript
import { base64url } from "multiformats/bases/base64";
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import { base32 } from "multiformats/bases/base32";
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import { equalBytes } from "@noble/curves/abstract/utils";
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import { CID_TYPES } from "#constants.js";
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export class Multihash {
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fullBytes: Uint8Array;
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constructor(fullBytes: Uint8Array) {
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this.fullBytes = fullBytes;
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}
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get functionType(): number {
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return this.fullBytes[0];
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}
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get hashBytes(): Uint8Array {
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return this.fullBytes.subarray(1);
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}
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static fromBase64Url(hash: string): Multihash {
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while (hash.length % 4 !== 0) {
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hash += "=";
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}
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if (hash[0] !== "u") {
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hash = "u" + hash;
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}
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const bytes = base64url.decode(hash);
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return new Multihash(new Uint8Array(bytes));
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}
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toBase64Url(): string {
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return base64url.encode(this.fullBytes).substring(1);
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}
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toBase32(): string {
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return base32
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.encode(this.fullBytes)
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.replace(/=/g, "")
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.toLowerCase()
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.substring(1);
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}
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toString(): string {
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return this.functionType === CID_TYPES.BRIDGE
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? new TextDecoder().decode(this.fullBytes)
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: this.toBase64Url();
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}
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equals(other: any): boolean {
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if (!(other instanceof Multihash)) {
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return false;
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}
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return equalBytes(this.fullBytes, other.fullBytes);
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}
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get hashCode(): number {
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return (
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this.fullBytes[0] +
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this.fullBytes[1] * 256 +
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this.fullBytes[2] * 256 * 256 +
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this.fullBytes[3] * 256 * 256 * 256
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);
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}
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}
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