wren/glyph Public Public: anyone can read this; nobody can change it.

/**

 * The API, described: every route in `routes.ts` that declares `api`, as an

 * OpenAPI 3.1 document. Each operation also names the contract cell it is

 * (`x-contract`: the resource, the verb, and the least role the table asks

 * for), so a change of policy is a change here too, and shows in the pull.

 *

 *   bun run contract:emit    write contract/openapi.json from the table

 *

 * `src/openapi.test.ts` fails when the committed file and the routes

 * disagree: the description can go stale only in a commit that fails.

 */

import { contract } from "./contract.ts";

import { description, title, version } from "./env.ts";

import { AUDIT_ROW, DRAWING, ERROR, routes, type Schema } from "./routes.ts";

import { doorOf } from "./security.ts";

// The shapes said once, under components, and referred to wherever they appear.

const NAMED = new Map<Schema, string>([

  [DRAWING, "Drawing"],

  [AUDIT_ROW, "AuditRow"],

  [ERROR, "Error"],

]);

const named = (schema: Schema): Schema => {

  const name = NAMED.get(schema);

  if (name !== undefined) return { $ref: `#/components/schemas/${name}` };

  return Object.fromEntries(

    Object.entries(schema).map(([key, value]) => [

      key,

      typeof value === "object" && value !== null && !Array.isArray(value)

        ? named(value as Schema)

        : value,

    ]),

  );

};

const content = (schema: Schema) => ({

  "application/json": { schema: named(schema) },

});

export function openapi(): Record<string, unknown> {

  const paths: Record<string, Record<string, unknown>> = {};

  for (const route of routes) {

    if (route.api === undefined) continue;

    const { summary, body, answer, status, query } = route.api;

    const path = route.path.replace(/:(\w+)/g, "{$1}");

    const params = [...route.path.matchAll(/:(\w+)/g)].map(([, name]) => ({

      name,

      in: "path",

      required: true,

      schema: { type: "integer" },

    }));

    const door = doorOf(route.method, route.path.replace(/:\w+/g, "0"));

    const least =

      door === undefined

        ? undefined

        : contract.resources[door.resource]?.can[door.verb];

    paths[path] ??= {};

    paths[path][route.method.toLowerCase()] = {

      summary,

      operationId: `${route.method.toLowerCase()}${path.replace(/[{}]/g, "").replace(/(^|[/._-])(\w)/g, (_, __, c: string) => c.toUpperCase())}`,

      ...(params.length > 0 || query !== undefined

        ? {

            parameters: [

              ...params,

              ...Object.entries(query ?? {}).map(([name, schema]) => ({

                name,

                in: "query",

                schema: named(schema),

              })),

            ],

          }

        : {}),

      ...(body === undefined

        ? {}

        : { requestBody: { required: true, content: content(body) } }),

      responses: {

        [String(status ?? 200)]: {

          description: summary,

          content: content(answer),

        },

        default: {

          description: "{ error, message }: why not",

          content: content(ERROR),

        },

      },

      ...(door === undefined ? {} : { "x-contract": { ...door, least } }),

    };

  }

  return {

    openapi: "3.1.0",

    info: { title, version, description },

    paths,

    components: {

      schemas: Object.fromEntries(

        [...NAMED].map(([schema, name]) => [name, schema]),

      ),

    },

  };

}

/** The file's text: stable, so the same table always writes the same bytes. */

export const emit = (): string => `${JSON.stringify(openapi(), null, 2)}\n`;