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ContractRootNode,
OpRootNode,
ContractTypeNode,
FieldNode,
ModelNode,
OpRouteNode,
OpOperationNode,
ParamSource,
} from '@contractkit/core';
import { resolveModifiers, resolveSecurity, SECURITY_NONE } from '@contractkit/core';
export interface OpenApiServerEntry {
url: string;
description?: string;
}
export interface OpenApiSecurityScheme {
type: string;
scheme?: string;
bearerFormat?: string;
name?: string;
in?: string;
}
export interface OpenApiConfig {
baseDir?: string;
output?: string;
info?: {
title?: string;
version?: string;
description?: string;
};
servers?: OpenApiServerEntry[];
/** Global OpenAPI security requirements (e.g. [{ bearerAuth: [] }]). Distinct from scheme definitions. */
security?: Record<string, string[]>[];
/**
* Whether to document operations marked `internal`. Defaults to `false` — internal ops
* are omitted from the spec so external consumers don't see them. Set to `true` for an
* internal-use spec.
*/
includeInternal?: boolean;
}
// ─── Type reachability ────────────────────────────────────────────────────
function collectRefsFromType(type: ContractTypeNode, out: Set<string>): void {
switch (type.kind) {
case 'ref':
out.add(type.name);
break;
case 'array':
collectRefsFromType(type.item, out);
break;
case 'tuple':
for (const item of type.items) collectRefsFromType(item, out);
break;
case 'record':
collectRefsFromType(type.value, out);
break;
case 'union':
case 'discriminatedUnion':
case 'intersection':
for (const member of type.members) collectRefsFromType(member, out);
break;
case 'lazy':
collectRefsFromType(type.inner, out);
break;
case 'inlineObject':
for (const field of type.fields) collectRefsFromType(field.type, out);
break;
}
}
function collectParamSourceRefs(source: ParamSource | undefined, out: Set<string>): void {
if (!source) return;
Iif (source.kind === 'ref') {
out.add(source.name);
return;
}
Eif (source.kind === 'params') {
for (const p of source.nodes) collectRefsFromType(p.type, out);
return;
}
collectRefsFromType(source.node, out);
}
/** Collect all type names directly referenced by public operations (seed set). */
function collectPublicTypeRefs(opRoots: OpRootNode[], includeInternal = false): Set<string> {
const refs = new Set<string>();
for (const opRoot of opRoots) {
for (const route of opRoot.routes) {
for (const op of route.operations) {
if (!includeInternal && resolveModifiers(route, op).includes('internal')) continue;
if (op.request) {
for (const body of op.request.bodies) collectRefsFromType(body.bodyType, refs);
}
for (const resp of op.responses) {
if (resp.bodyType) collectRefsFromType(resp.bodyType, refs);
if (resp.headers) {
for (const h of resp.headers) collectRefsFromType(h.type, refs);
}
}
collectParamSourceRefs(route.params, refs);
collectParamSourceRefs(op.query, refs);
collectParamSourceRefs(op.headers, refs);
}
}
}
return refs;
}
/** BFS-expand seed type names through the contract model graph. */
function computeReachableSchemas(seeds: Set<string>, modelMap: Map<string, ModelNode>): Set<string> {
const reachable = new Set<string>(seeds);
const frontier = [...seeds];
while (frontier.length > 0) {
const name = frontier.pop()!;
const model = modelMap.get(name);
if (!model) continue;
const refs = new Set<string>();
if (model.type) collectRefsFromType(model.type, refs);
for (const field of model.fields) collectRefsFromType(field.type, refs);
Iif (model.bases) for (const b of model.bases) refs.add(b);
for (const ref of refs) {
Eif (!reachable.has(ref)) {
reachable.add(ref);
frontier.push(ref);
}
}
}
return reachable;
}
// ─── Public entry point ────────────────────────────────────────────────────
export interface OpenApiCodegenContext {
contractRoots: ContractRootNode[];
opRoots: OpRootNode[];
config: OpenApiConfig;
/** Named OpenAPI security scheme definitions to include in components.securitySchemes */
securitySchemes?: Record<string, OpenApiSecurityScheme>;
}
export function generateOpenApi(ctx: OpenApiCodegenContext): string {
const { contractRoots, opRoots, config, securitySchemes } = ctx;
const includeInternal = config.includeInternal ?? false;
const doc: Record<string, unknown> = {
openapi: '3.1.0',
info: {
title: config.info?.title ?? 'API',
version: config.info?.version ?? '0.0.1',
...(config.info?.description ? { description: config.info.description } : {}),
},
};
if (config.servers && config.servers.length > 0) {
doc.servers = config.servers;
}
if (config.security && config.security.length > 0) {
doc.security = config.security;
}
// Build component schemas from all contract models
const allSchemas: Record<string, unknown> = {};
const modelMap = new Map<string, ModelNode>();
for (const contractRoot of contractRoots) {
for (const model of contractRoot.models) {
modelMap.set(model.name, model);
}
}
for (const contractRoot of contractRoots) {
for (const model of contractRoot.models) {
allSchemas[model.name] = modelToSchema(model, modelMap);
}
}
// Build paths from all operation files
const paths: Record<string, Record<string, unknown>> = {};
for (const opRoot of opRoots) {
for (const route of opRoot.routes) {
const oaPath = convertPath(route.path);
for (const op of route.operations) {
const mods = resolveModifiers(route, op);
if (!includeInternal && mods.includes('internal')) continue;
// Lazily initialize the path object so all-internal routes
// leave no empty entry in the output
if (!paths[oaPath]) paths[oaPath] = {};
const operation = buildOperation(route, op);
if (mods.includes('deprecated')) (operation as Record<string, unknown>).deprecated = true;
paths[oaPath][op.method] = operation;
}
}
}
doc.paths = paths;
// Filter schemas to only include types reachable from public operations.
// When there are no op files, all schemas are included (no filtering).
const schemas: Record<string, unknown> =
opRoots.length > 0
? (() => {
const reachable = computeReachableSchemas(collectPublicTypeRefs(opRoots, includeInternal), modelMap);
const filtered: Record<string, unknown> = {};
for (const [name, schema] of Object.entries(allSchemas)) {
if (reachable.has(name)) filtered[name] = schema;
}
return filtered;
})()
: allSchemas;
const components: Record<string, unknown> = {};
if (Object.keys(schemas).length > 0) {
components.schemas = schemas;
}
if (securitySchemes && Object.keys(securitySchemes).length > 0) {
components.securitySchemes = securitySchemes;
}
if (Object.keys(components).length > 0) {
doc.components = components;
}
return toYaml(doc);
}
// ─── Path conversion ──────────────────────────────────────────────────────
/** Path is already in OpenAPI `{param}` style — return as-is. */
function convertPath(path: string): string {
return path;
}
// ─── Schema conversion ───────────────────────────────────────────────────
function modelToSchema(model: ModelNode, modelMap?: Map<string, ModelNode>): Record<string, unknown> {
// Type alias (no fields)
if (model.type) {
const schema = typeToSchema(model.type, modelMap);
Iif (model.description) schema.description = model.description;
return schema;
}
const properties: Record<string, unknown> = {};
const required: string[] = [];
for (const field of model.fields) {
const prop = fieldToSchema(field, modelMap);
properties[field.name] = prop;
if (!field.optional) {
required.push(field.name);
}
}
const schema: Record<string, unknown> = {
type: 'object',
properties,
};
Eif (required.length > 0) {
schema.required = required;
}
if (model.bases && model.bases.length > 0) {
return {
allOf: [...model.bases.map(b => ({ $ref: `#/components/schemas/${b}` })), schema],
};
}
if (model.description) {
schema.description = model.description;
}
Iif (model.deprecated) {
schema.deprecated = true;
}
return schema;
}
function fieldToSchema(field: FieldNode, modelMap?: Map<string, ModelNode>): Record<string, unknown> {
let schema = typeToSchema(field.type, modelMap);
Iif (field.nullable) {
schema = wrapNullable(schema);
}
if (field.visibility === 'readonly') {
schema.readOnly = true;
} else if (field.visibility === 'writeonly') {
schema.writeOnly = true;
}
if (field.default !== undefined) {
schema.default = field.default;
}
if (field.description) {
schema.description = field.description;
}
Iif (field.deprecated) {
schema.deprecated = true;
}
return schema;
}
function typeToSchema(type: ContractTypeNode, modelMap?: Map<string, ModelNode>): Record<string, unknown> {
switch (type.kind) {
case 'scalar':
return scalarToSchema(type);
case 'array':
return arrayToSchema(type, modelMap);
case 'tuple':
return { type: 'array', prefixItems: type.items.map(i => typeToSchema(i, modelMap)) };
case 'record':
return { type: 'object', additionalProperties: typeToSchema(type.value, modelMap) };
case 'enum':
return { type: 'string', enum: type.values };
case 'literal':
return { const: type.value };
case 'union':
return { oneOf: type.members.map(m => typeToSchema(m, modelMap)) };
case 'discriminatedUnion': {
const oneOf = type.members.map(m => typeToSchema(m, modelMap));
const mapping: Record<string, string> = {};
for (const member of type.members) {
Iif (member.kind !== 'ref') continue;
const literalValues = resolveDiscriminatorLiterals(member.name, type.discriminator, modelMap);
Iif (literalValues.length === 0) continue;
for (const v of literalValues) {
mapping[v] = `#/components/schemas/${member.name}`;
}
}
const result: Record<string, unknown> = {
oneOf,
discriminator: { propertyName: type.discriminator },
};
Eif (Object.keys(mapping).length > 0) {
(result.discriminator as Record<string, unknown>).mapping = mapping;
}
return result;
}
case 'intersection':
return { allOf: type.members.map(m => typeToSchema(m, modelMap)) };
case 'ref':
return { $ref: `#/components/schemas/${type.name}` };
case 'inlineObject':
return inlineObjectToSchema(type.fields, modelMap);
case 'lazy':
return typeToSchema(type.inner, modelMap);
}
}
/** Resolve literal values of a model's discriminator field. Returns [] if not resolvable. */
function resolveDiscriminatorLiterals(modelName: string, discriminator: string, modelMap?: Map<string, ModelNode>): string[] {
Iif (!modelMap) return [];
const model = modelMap.get(modelName);
Iif (!model) return [];
const field = model.fields.find(f => f.name === discriminator);
Iif (!field) return [];
Eif (field.type.kind === 'literal') return [String(field.type.value)];
if (field.type.kind === 'enum') return field.type.values;
return [];
}
function scalarToSchema(type: import('@contractkit/core').ScalarTypeNode): Record<string, unknown> {
const s: Record<string, unknown> = {};
switch (type.name) {
case 'string':
s.type = 'string';
if (type.min !== undefined) s.minLength = Number(type.min);
if (type.max !== undefined) s.maxLength = Number(type.max);
Iif (type.len !== undefined) {
s.minLength = type.len;
s.maxLength = type.len;
}
Iif (type.regex) s.pattern = type.regex;
break;
case 'number':
s.type = 'number';
if (type.min !== undefined) s.minimum = Number(type.min);
if (type.max !== undefined) s.maximum = Number(type.max);
break;
case 'int':
s.type = 'integer';
if (type.min !== undefined) s.minimum = Number(type.min);
if (type.max !== undefined) s.maximum = Number(type.max);
break;
case 'bigint':
s.type = 'integer';
s.format = 'int64';
break;
case 'boolean':
s.type = 'boolean';
break;
case 'date':
s.type = 'string';
s.format = 'date';
break;
case 'datetime':
s.type = 'string';
s.format = 'date-time';
break;
case 'duration':
s.type = 'string';
s.format = 'duration';
break;
case 'email':
s.type = 'string';
s.format = 'email';
break;
case 'url':
s.type = 'string';
s.format = 'uri';
break;
case 'uuid':
s.type = 'string';
s.format = 'uuid';
break;
case 'unknown':
// No type constraint
break;
case 'null':
s.type = 'null';
break;
case 'object':
s.type = 'object';
break;
case 'binary':
s.type = 'string';
s.format = 'binary';
break;
case 'json':
// Any JSON value — no type constraint
break;
}
return s;
}
function arrayToSchema(type: import('@contractkit/core').ArrayTypeNode, modelMap?: Map<string, ModelNode>): Record<string, unknown> {
const s: Record<string, unknown> = { type: 'array', items: typeToSchema(type.item, modelMap) };
Iif (type.min !== undefined) s.minItems = type.min;
Iif (type.max !== undefined) s.maxItems = type.max;
return s;
}
function inlineObjectToSchema(fields: FieldNode[], modelMap?: Map<string, ModelNode>): Record<string, unknown> {
const properties: Record<string, unknown> = {};
const required: string[] = [];
for (const field of fields) {
properties[field.name] = fieldToSchema(field, modelMap);
Eif (!field.optional) {
required.push(field.name);
}
}
const schema: Record<string, unknown> = { type: 'object', properties };
Eif (required.length > 0) schema.required = required;
return schema;
}
function wrapNullable(schema: Record<string, unknown>): Record<string, unknown> {
// OpenAPI 3.1 uses JSON Schema nullable via oneOf or type array
if (schema.$ref) {
return { oneOf: [schema, { type: 'null' }] };
}
if (typeof schema.type === 'string') {
schema.type = [schema.type, 'null'];
}
return schema;
}
// ─── Operation building ─────────────────────────────────────────────────
function buildOperation(route: OpRouteNode, op: OpOperationNode): Record<string, unknown> {
const operation: Record<string, unknown> = {};
// operationId from service binding or SDK name
if (op.sdk) {
operation.operationId = op.sdk;
} else if (op.service) {
const methodPart = op.service.split('.').pop();
Eif (methodPart) operation.operationId = methodPart;
}
if (op.description) {
operation.description = op.description;
}
// Parameters: path params + query + headers
const parameters: Record<string, unknown>[] = [];
if (route.params) {
parameters.push(...paramSourceToParams(route.params, 'path'));
}
if (op.query) {
parameters.push(...paramSourceToParams(op.query, 'query'));
}
if (op.headers) {
parameters.push(...paramSourceToParams(op.headers, 'header'));
}
if (parameters.length > 0) {
operation.parameters = parameters;
}
// Request body
if (op.request && op.request.bodies.length > 0) {
const content: Record<string, { schema: ReturnType<typeof typeToSchema> }> = {};
for (const body of op.request.bodies) {
content[body.contentType] = { schema: typeToSchema(body.bodyType) };
}
operation.requestBody = { required: true, content };
}
// Effective security (operation-level wins; falls back to route-level)
// security: none → empty array (explicit public endpoint, overrides global default)
// security: { fields } → omit operation-level entry (rely on global security from config)
const effectiveSecurity = resolveSecurity(route, op);
Iif (effectiveSecurity === SECURITY_NONE) {
operation.security = [];
}
// Responses
const responses: Record<string, unknown> = {};
for (const resp of op.responses) {
const statusKey = String(resp.statusCode);
const responseObject: Record<string, unknown> = {
description: statusDescription(resp.statusCode),
};
if (resp.bodyType && resp.contentType) {
responseObject.content = {
[resp.contentType]: {
schema: typeToSchema(resp.bodyType),
},
};
}
if (resp.headers && resp.headers.length > 0) {
const headers: Record<string, unknown> = {};
for (const h of resp.headers) {
const headerObject: Record<string, unknown> = {
schema: typeToSchema(h.type),
};
if (!h.optional) headerObject.required = true;
if (h.description) headerObject.description = h.description;
headers[h.name] = headerObject;
}
responseObject.headers = headers;
}
responses[statusKey] = responseObject;
}
if (Object.keys(responses).length > 0) {
operation.responses = responses;
}
return operation;
}
function paramSourceToParams(source: ParamSource, location: 'path' | 'query' | 'header'): Record<string, unknown>[] {
Iif (source.kind === 'ref') {
// Type reference name used as param source — emit a single $ref
return [
{
name: source.name,
in: location,
required: location === 'path',
schema: { $ref: `#/components/schemas/${source.name}` },
},
];
}
Eif (source.kind === 'params') {
// Inline param declarations
return source.nodes.map(p => ({
name: p.name,
in: location,
required: location === 'path',
schema: typeToSchema(p.type),
}));
}
// ContractTypeNode (inline object or other type) — if it's an inlineObject, expand fields
if (source.node.kind === 'inlineObject') {
return source.node.fields.map(f => ({
name: f.name,
in: location,
required: location === 'path' ? true : !f.optional,
schema: typeToSchema(f.type),
}));
}
// For a ref type used as param source
if (source.node.kind === 'ref') {
return [
{
name: source.node.name,
in: location,
required: location === 'path',
schema: { $ref: `#/components/schemas/${source.node.name}` },
},
];
}
return [];
}
function statusDescription(code: number): string {
const descriptions: Record<number, string> = {
200: 'Successful response',
201: 'Created',
204: 'No content',
400: 'Bad request',
401: 'Unauthorized',
403: 'Forbidden',
404: 'Not found',
409: 'Conflict',
422: 'Unprocessable entity',
500: 'Internal server error',
};
return descriptions[code] ?? `Response ${code}`;
}
// ─── YAML serializer ──────────────────────────────────────────────────────
/**
* Minimal YAML serializer sufficient for OpenAPI documents.
* Avoids external dependency while producing clean, readable output.
*/
export function toYaml(value: unknown, indent = 0): string {
if (value === null || value === undefined) return 'null';
if (typeof value === 'boolean') return value ? 'true' : 'false';
if (typeof value === 'number') return String(value);
Iif (typeof value === 'bigint') return String(value);
if (typeof value === 'string') {
return yamlString(value);
}
if (Array.isArray(value)) {
if (value.length === 0) return '[]';
// Check if all items are simple scalars (for inline arrays like enum values, required lists)
if (value.every(v => typeof v === 'string' || typeof v === 'number' || typeof v === 'boolean')) {
const items = value.map(v => (typeof v === 'string' ? yamlString(v) : String(v)));
const inline = `[${items.join(', ')}]`;
Eif (inline.length < 80) return inline;
}
const lines: string[] = [];
const pad = ' '.repeat(indent);
for (const item of value) {
if (isPlainObject(item)) {
const entries = Object.entries(item as Record<string, unknown>);
if (entries.length > 0) {
const [firstKey, firstVal] = entries[0]!;
const firstValStr = isComplex(firstVal) ? `\n${toYamlValue(firstVal, indent + 2)}` : ` ${toYaml(firstVal, indent + 2)}`;
lines.push(`${pad}- ${yamlKey(firstKey)}:${firstValStr}`);
for (let i = 1; i < entries.length; i++) {
const [k, v] = entries[i]!;
const valStr = isComplex(v) ? `\n${toYamlValue(v, indent + 2)}` : ` ${toYaml(v, indent + 2)}`;
lines.push(`${pad} ${yamlKey(k)}:${valStr}`);
}
} else E{
lines.push(`${pad}- {}`);
}
} else E{
lines.push(`${pad}- ${toYaml(item, indent + 1)}`);
}
}
return lines.join('\n');
}
Eif (isPlainObject(value)) {
const obj = value as Record<string, unknown>;
const entries = Object.entries(obj);
if (entries.length === 0) return '{}';
const pad = ' '.repeat(indent);
const lines: string[] = [];
for (const [key, val] of entries) {
if (isComplex(val)) {
lines.push(`${pad}${yamlKey(key)}:`);
lines.push(toYamlValue(val, indent + 1));
} else {
lines.push(`${pad}${yamlKey(key)}: ${toYaml(val, indent + 1)}`);
}
}
return lines.join('\n');
}
return String(value);
}
function toYamlValue(value: unknown, indent: number): string {
if (Array.isArray(value)) {
return toYaml(value, indent);
}
Eif (isPlainObject(value)) {
return toYaml(value, indent);
}
return ' '.repeat(indent) + toYaml(value, indent);
}
function isComplex(value: unknown): boolean {
if (Array.isArray(value)) {
// Simple scalar arrays can be inlined
if (value.every(v => typeof v === 'string' || typeof v === 'number' || typeof v === 'boolean')) {
const items = value.map(v => (typeof v === 'string' ? yamlString(v) : String(v)));
return `[${items.join(', ')}]`.length >= 80;
}
return true;
}
return isPlainObject(value);
}
function isPlainObject(value: unknown): boolean {
return typeof value === 'object' && value !== null && !Array.isArray(value);
}
function yamlString(s: string): string {
// Use plain style if safe, otherwise single-quoted
if (s === '') return "''";
if (/^[\w./-]+$/.test(s) && !/^(true|false|null|yes|no|on|off)$/i.test(s) && !/^\d/.test(s)) {
return s;
}
// Single-quote, escaping internal single quotes by doubling
return `'${s.replace(/'/g, "''")}'`;
}
function yamlKey(key: string): string {
// Keys with special chars need quoting
if (/^[\w-]+$/.test(key) && !/^(true|false|null|yes|no|on|off)$/i.test(key)) {
return key;
}
return `'${key.replace(/'/g, "''")}'`;
}
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