@alexop/openapi-zod-client/src/makeSchemaResolver.ts

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import type { OpenAPIObject, SchemaObject } from "openapi3-ts";
import { get } from "pastable/server";

import { normalizeString } from "./utils";

const autocorrectRef = (ref: string) => (ref[1] === "/" ? ref : "#/" + ref.slice(1));

type RefInfo = {
    ref: string;
    name: string;
    normalized: string;
};

export const makeSchemaResolver = (doc: OpenAPIObject) => {
    // both used for debugging purpose
    // eslint-disable-next-line sonarjs/no-unused-collection
    const nameByRef = new Map<string, string>();
    // eslint-disable-next-line sonarjs/no-unused-collection
    const refByName = new Map<string, string>();

    const byRef = new Map<string, RefInfo>();
    const byNormalized = new Map<string, RefInfo>();

    const getSchemaByRef = (ref: string) => {
        // #components -> #/components
        const correctRef = autocorrectRef(ref);
        const split = correctRef.split("/");

        // "#/components/schemas/Something.jsonld" -> #/components/schemas
        const path = split.slice(1, -1).join("/")!;
        const map = get(doc, path.replace("#/", "").replace("#", "").replaceAll("/", ".")) ?? ({} as any);

        // "#/components/schemas/Something.jsonld" -> "Something.jsonld"
        const name = split[split.length - 1]!;
        const normalized = normalizeString(name);

        nameByRef.set(correctRef, normalized);
        refByName.set(normalized, correctRef);

        const infos = { ref: correctRef, name, normalized };
        byRef.set(infos.ref, infos);
        byNormalized.set(infos.normalized, infos);

        // doc.components.schemas["Something.jsonld"]
        return map[name] as SchemaObject;
    };

    return {
        getSchemaByRef,
        resolveRef: (ref: string) => byRef.get(autocorrectRef(ref))!,
        resolveSchemaName: (normalized: string) => byNormalized.get(normalized)!,
    };
};

export type DocumentResolver = ReturnType<typeof makeSchemaResolver>;