@ndn/packet/lib/name/digest-comp_node.js

NDNts: Network Layer Packets

import { fromHex, toHex } from "@ndn/util";
import { TT } from "../an_node.js";
import { Component } from "./component_node.js";
const DIGEST_LENGTH = 32;
class DigestComp {
    tt;
    altUriPrefix;
    altUriRegex;
    constructor(tt, altUriPrefix) {
        this.tt = tt;
        this.altUriPrefix = altUriPrefix;
        this.altUriRegex = new RegExp(`^${altUriPrefix}=([0-9a-fA-F]{${2 * DIGEST_LENGTH}})$`);
    }
    match(comp) {
        return comp.type === this.tt && comp.length === DIGEST_LENGTH;
    }
    create(v) {
        if (v.length !== DIGEST_LENGTH) {
            throw new Error(`digest length must be ${DIGEST_LENGTH}`);
        }
        return new Component(this.tt, v);
    }
    parse(comp) {
        return comp.value;
    }
    toAltUri(comp) {
        return `${this.altUriPrefix}=${toHex(comp.value).toLowerCase()}`;
    }
    fromAltUri(input) {
        const m = this.altUriRegex.exec(input);
        if (!m) {
            return undefined;
        }
        return new Component(this.tt, fromHex(m[1]));
    }
}
class ImplicitDigestComp extends DigestComp {
    /** Remove ImplicitDigest if present at last component. */
    strip(name) {
        if (name.get(-1)?.is(this)) {
            return name.getPrefix(-1);
        }
        return name;
    }
}
/** ImplicitSha256DigestComponent. */
export const ImplicitDigest = new ImplicitDigestComp(TT.ImplicitSha256DigestComponent, "sha256digest");
class ParamsDigestPlaceHolder extends Component {
}
class ParamsDigestComp extends DigestComp {
    /** ParamsDigest placeholder during Interest encoding. */
    PLACEHOLDER = new ParamsDigestPlaceHolder(this.tt, "placeholder");
    /** Determine if comp is a ParamsDigest placeholder. */
    isPlaceholder(comp) {
        return comp instanceof ParamsDigestPlaceHolder;
    }
    /** Find ParamsDigest or placeholder in name. */
    findIn(name, matchPlaceholder = true) {
        return name.comps.findIndex((comp) => this.match(comp) ||
            (matchPlaceholder && this.isPlaceholder(comp)));
    }
}
/** ParametersSha256DigestComponent */
export const ParamsDigest = new ParamsDigestComp(TT.ParametersSha256DigestComponent, "params-sha256");