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import { resolveModifiers, classifyContentType } from '@contractkit/core';
import { renderPyType, toPythonFieldName } from './codegen-models.js';
// ─── Public entry point ────────────────────────────────────────────────────
export interface ClientCodegenOptions {
/** Map from model name → Python module path (e.g. "._models_payments") */
modelModulePaths?: Map<string, string>;
/** Current client's module name (e.g. "_client_payments") — used to avoid self-imports */
currentModule?: string;
/** Set of model names that have Input variants */
modelsWithInput?: Set<string>;
/**
* Whether to emit client methods for operations marked `internal`. Defaults to `false` —
* internal ops are omitted so consumers don't pick them up. Set to `true` for an
* internal-use SDK that should expose them.
*/
includeInternal?: boolean;
}
/**
* Returns true if the root contains at least one operation eligible for client emission.
* With `includeInternal: false` (default) that means at least one non-internal op; with
* `includeInternal: true` any op qualifies.
*/
export function hasPublicOperations(root: OpRootNode, includeInternal = false): boolean {
for (const route of root.routes) {
for (const op of route.operations) {
if (includeInternal || !resolveModifiers(route, op).includes('internal')) return true;
}
}
return false;
}
/**
* Generate a Pydantic/httpx async Python client class from an OpRootNode.
*/
export function generatePythonClient(root: OpRootNode, opts: ClientCodegenOptions = {}): string {
const clientClassName = deriveClientClassName(root.file);
const { modelsWithInput } = opts;
const includeInternal = opts.includeInternal ?? false;
// Collect all model types referenced in public ops
const referencedModels = collectReferencedModels(root, modelsWithInput, includeInternal);
const lines: string[] = [];
lines.push('# Auto-generated by contractkit-plugin-python-sdk. Do not edit manually.');
lines.push('from __future__ import annotations');
lines.push('');
// stdlib imports
const needsDatetime = referencedModels.has('__datetime__');
const needsDate = referencedModels.has('__date__');
const needsTime = referencedModels.has('__time__');
const needsUUID = referencedModels.has('__uuid__');
const needsAny = referencedModels.has('__any__');
Iif (needsDatetime || needsDate || needsTime) {
const dtParts: string[] = [];
if (needsDate) dtParts.push('date');
if (needsDatetime) dtParts.push('datetime');
if (needsTime) dtParts.push('time');
lines.push(`from datetime import ${dtParts.join(', ')}`);
}
if (needsUUID) lines.push('from uuid import UUID');
// Collect public ops once — used both for TypedDict emission and method generation.
const publicOps: Array<{ route: OpRouteNode; op: OpOperationNode }> = [];
for (const route of root.routes) {
for (const op of route.operations) {
if (!includeInternal && resolveModifiers(route, op).includes('internal')) continue;
publicOps.push({ route, op });
}
}
const opsWithRespHeaders = publicOps.filter(({ op }) => {
const primary = op.responses.find(r => r.bodyType) ?? op.responses[0];
return (primary?.headers?.length ?? 0) > 0;
});
if (needsAny || opsWithRespHeaders.length > 0) {
const typingImports: string[] = [];
Iif (needsAny) typingImports.push('Any');
Eif (opsWithRespHeaders.length > 0) typingImports.push('TypedDict');
lines.push(`from typing import ${typingImports.join(', ')}`);
}
lines.push('from ._base_client import BaseClient, SdkError # noqa: F401');
// Model imports grouped by module
const modelImportsByModule = new Map<string, Set<string>>();
for (const name of referencedModels) {
if (name.startsWith('__')) continue; // sentinel keys
const modulePath = opts.modelModulePaths?.get(name);
if (modulePath) {
let s = modelImportsByModule.get(modulePath);
if (!s) {
s = new Set();
modelImportsByModule.set(modulePath, s);
}
s.add(name);
}
}
for (const [mod, names] of [...modelImportsByModule].sort((a, b) => a[0].localeCompare(b[0]))) {
const sorted = [...names].sort().join(', ');
lines.push(`from ${mod} import ${sorted}`);
}
// Per-method response-header TypedDicts.
for (const { route, op } of opsWithRespHeaders) {
const primary = op.responses.find(r => r.bodyType) ?? op.responses[0]!;
const className = `${snakeToPascal(deriveMethodName(op, route))}Headers`;
lines.push('');
lines.push('');
lines.push(`class ${className}(TypedDict, total=False):`);
for (const h of primary.headers!) {
const pyName = toPythonFieldName(h.name);
const tag = h.optional ? 'optional' : 'required';
lines.push(` ${pyName}: str # ${h.name} (${tag})`);
}
}
lines.push('');
lines.push('');
lines.push(`class ${clientClassName}(BaseClient):`);
let hasAnyMethod = false;
for (const route of root.routes) {
for (const op of route.operations) {
const mods = resolveModifiers(route, op);
if (!includeInternal && mods.includes('internal')) continue;
hasAnyMethod = true;
lines.push('');
if (mods.includes('deprecated')) lines.push(' # @deprecated');
lines.push(...generateMethod(route, op, opts));
}
}
Iif (!hasAnyMethod) {
lines.push(' pass');
}
lines.push('');
return lines.join('\n');
}
// ─── Method generation ────────────────────────────────────────────────────
interface MethodParam {
name: string;
type: string;
optional: boolean;
isModel: boolean; // Pydantic BaseModel → use .model_dump(mode="json")
}
function generateMethod(route: OpRouteNode, op: OpOperationNode, opts: ClientCodegenOptions): string[] {
const lines: string[] = [];
const { modelsWithInput } = opts;
const methodName = deriveMethodName(op, route);
const httpMethod = op.method.toUpperCase();
const params = buildMethodParams(route, op, modelsWithInput);
const selfParam = 'self';
const allParams = params.map(p => {
if (p.optional) return `${p.name}: ${p.type} | None = None`;
return `${p.name}: ${p.type}`;
});
const paramStr = allParams.length > 0 ? `, ${allParams.join(', ')}` : '';
// Return type — non-JSON responses ignore the schema and return raw bytes/str.
const primaryResponse = op.responses.find(r => r.bodyType) ?? op.responses[0];
const isVoid = !primaryResponse?.bodyType;
const respCategory = primaryResponse?.contentType ? classifyContentType(primaryResponse.contentType) : 'json';
const dataType = isVoid
? 'None'
: respCategory === 'text'
? 'str'
: respCategory === 'binary'
? 'bytes'
: renderPyType(primaryResponse!.bodyType!, modelsWithInput);
const isModelReturn = !isVoid && respCategory === 'json' && isModelRef(primaryResponse!.bodyType!, modelsWithInput);
const isListModelReturn = !isVoid && respCategory === 'json' && isListModelRef(primaryResponse!.bodyType!, modelsWithInput);
const respHeaders = primaryResponse?.headers ?? [];
const hasRespHeaders = respHeaders.length > 0;
const headersTypeName = hasRespHeaders ? `${snakeToPascal(methodName)}Headers` : '';
const returnType = hasRespHeaders ? (isVoid ? headersTypeName : `tuple[${dataType}, ${headersTypeName}]`) : dataType;
// Description
const desc = op.description ?? route.description;
if (op.name || desc) {
lines.push(` async def ${methodName}(${selfParam}${paramStr}) -> ${returnType}:`);
lines.push(` """`);
Eif (op.name) lines.push(` ${op.name}`);
Iif (desc) lines.push(` ${desc}`);
lines.push(` """`);
} else {
lines.push(` async def ${methodName}(${selfParam}${paramStr}) -> ${returnType}:`);
}
// Build URL
const urlExpr = buildUrlExpression(route.path);
// Query params
const hasQuery = !!op.query;
const primaryBody = op.request?.bodies[0];
const hasBody = !!primaryBody;
const isMultipart = primaryBody?.contentType === 'multipart/form-data';
const hasCustomHeaders = !!op.headers;
// Build kwargs for _fetch
const fetchKwargs: string[] = [];
fetchKwargs.push(`method="${httpMethod}"`);
const reqCategory = primaryBody?.contentType ? classifyContentType(primaryBody.contentType) : 'json';
if (hasBody) {
const bodyParam = params.find(p => p.name === 'body');
Iif (isMultipart) {
fetchKwargs.push('body=body');
} else if (reqCategory === 'text' || reqCategory === 'binary') {
// Pass-through: caller supplies a str / bytes payload that goes on the wire as-is.
fetchKwargs.push('body=body');
} else if (bodyParam?.isModel) {
fetchKwargs.push('body=body.model_dump(mode="json")');
} else E{
fetchKwargs.push('body=body');
}
// Forward the declared content-type so `_fetch` sets the correct Content-Type header
// (vendor JSON types like `application/vnd.api+json` still serialize as JSON but need
// their literal mime on the wire).
if (primaryBody.contentType !== 'application/json') {
fetchKwargs.push(`content_type=${JSON.stringify(primaryBody.contentType)}`);
}
if (reqCategory === 'text' || reqCategory === 'binary') {
fetchKwargs.push(`body_kind="${reqCategory}"`);
}
}
if (respCategory === 'text' || respCategory === 'binary') {
fetchKwargs.push(`response_kind="${respCategory}"`);
}
if (hasQuery) {
fetchKwargs.push('params=query');
}
Iif (hasCustomHeaders) {
fetchKwargs.push('extra_headers=custom_headers');
}
const kwargsStr = fetchKwargs.length > 1 ? fetchKwargs.join(', ') : (fetchKwargs[0] ?? '');
if (hasRespHeaders) {
lines.push(` result, _response_headers = await self._fetch_with_headers(${urlExpr}, ${kwargsStr})`);
lines.push(...buildHeadersDictLines(respHeaders, headersTypeName));
} else {
lines.push(` result = await self._fetch(${urlExpr}, ${kwargsStr})`);
}
if (isVoid) {
if (hasRespHeaders) {
lines.push(` return headers`);
} else {
lines.push(` return None`);
}
} else {
let dataExpr: string;
if (isListModelReturn) {
const innerType = getListItemType(primaryResponse!.bodyType!, modelsWithInput);
dataExpr = `[${innerType}.model_validate(item) for item in result]`;
} else if (isModelReturn) {
dataExpr = `${dataType}.model_validate(result)`;
} else {
dataExpr = 'result';
}
if (hasRespHeaders) {
lines.push(` return ${dataExpr}, headers`);
} else {
lines.push(` return ${dataExpr}`);
}
}
return lines;
}
/** Build the lines that construct a TypedDict literal of declared response headers. */
function buildHeadersDictLines(headers: OpResponseHeaderNode[], typeName: string): string[] {
const lines: string[] = [];
lines.push(` headers: ${typeName} = {}`);
for (const h of headers) {
const pyName = toPythonFieldName(h.name);
lines.push(` if ${JSON.stringify(h.name.toLowerCase())} in _response_headers:`);
lines.push(` headers[${JSON.stringify(pyName)}] = _response_headers[${JSON.stringify(h.name.toLowerCase())}]`);
}
return lines;
}
/** snake_case → PascalCase. */
function snakeToPascal(s: string): string {
return s
.split('_')
.filter(Boolean)
.map(p => p.charAt(0).toUpperCase() + p.slice(1))
.join('');
}
// ─── URL building ─────────────────────────────────────────────────────────
function buildUrlExpression(path: string): string {
// Replace {paramName} with Python f-string interpolation
const hasBraces = /\{[a-zA-Z_][a-zA-Z0-9_]*\}/.test(path);
if (!hasBraces) return `"${path}"`;
const interpolated = path.replace(/\{([a-zA-Z_][a-zA-Z0-9_]*)\}/g, (_m, name) => `{${name}}`);
return `f"${interpolated}"`;
}
// ─── Parameter building ───────────────────────────────────────────────────
function buildMethodParams(route: OpRouteNode, op: OpOperationNode, modelsWithInput?: Set<string>): MethodParam[] {
const params: MethodParam[] = [];
// Path params
if (route.params) {
if (route.params.kind === 'params') {
for (const p of route.params.nodes) {
params.push({
name: toPythonFieldName(p.name),
type: renderPyType(p.type, modelsWithInput),
optional: false,
isModel: false,
});
}
} else Eif (route.params.kind === 'ref') {
const typeName = modelsWithInput?.has(route.params.name) ? `${route.params.name}Input` : route.params.name;
params.push({ name: 'params', type: typeName, optional: false, isModel: true });
} else {
params.push({ name: 'params', type: renderPyType(route.params.node, modelsWithInput), optional: false, isModel: false });
}
}
// Body — use the first declared MIME's body type as the parameter type.
// Multi-MIME support in Python collapses to a single signature using the primary body.
const primaryBody = op.request?.bodies[0];
if (primaryBody) {
const cat = classifyContentType(primaryBody.contentType);
Iif (cat === 'multipart' || cat === 'binary') {
params.push({ name: 'body', type: 'bytes', optional: false, isModel: false });
} else if (cat === 'text') {
params.push({ name: 'body', type: 'str', optional: false, isModel: false });
} else {
const bodyType = renderInputPyType(primaryBody.bodyType, modelsWithInput);
const isModel = isModelRef(primaryBody.bodyType, modelsWithInput);
params.push({ name: 'body', type: bodyType, optional: false, isModel });
}
}
// Query
if (op.query) {
const queryType = renderParamSourceType(op.query, modelsWithInput, true);
params.push({ name: 'query', type: queryType, optional: true, isModel: false });
}
// Headers
Iif (op.headers) {
const headersType = renderParamSourceType(op.headers, modelsWithInput, true);
params.push({ name: 'custom_headers', type: headersType, optional: true, isModel: false });
}
return params;
}
function renderParamSourceType(source: ParamSource, modelsWithInput?: Set<string>, forInput = false): string {
Iif (source.kind === 'ref') {
const typeName = forInput && modelsWithInput?.has(source.name) ? `${source.name}Input` : source.name;
return typeName;
}
Eif (source.kind === 'params') {
// const fields = source.nodes.map(p => {
// const pyName = toPythonFieldName(p.name);
// return `"${pyName}": ${renderPyType(p.type, modelsWithInput, forInput)}`;
// });
return `dict`; // simplified — inline dicts are hard to type concisely in Python signatures
}
return renderPyType(source.node, modelsWithInput, forInput);
}
function renderInputPyType(type: ContractTypeNode, modelsWithInput?: Set<string>): string {
return renderPyType(type, modelsWithInput, true);
}
// ─── Model reference detection ────────────────────────────────────────────
function isModelRef(type: ContractTypeNode, modelsWithInput?: Set<string>): boolean {
if (type.kind === 'ref') return /^[A-Z]/.test(type.name);
Iif (type.kind === 'lazy') return isModelRef(type.inner, modelsWithInput);
return false;
}
function isListModelRef(type: ContractTypeNode, modelsWithInput?: Set<string>): boolean {
if (type.kind === 'array') return isModelRef(type.item, modelsWithInput);
Iif (type.kind === 'lazy') return isListModelRef(type.inner, modelsWithInput);
return false;
}
function getListItemType(type: ContractTypeNode, modelsWithInput?: Set<string>): string {
Eif (type.kind === 'array') return renderPyType(type.item, modelsWithInput);
return 'dict';
}
// ─── Referenced model collection ─────────────────────────────────────────
/**
* Collect all model names and scalar sentinels referenced in public operations.
* Sentinels: __datetime__, __date__, __time__, __uuid__, __any__
*/
function collectReferencedModels(root: OpRootNode, modelsWithInput?: Set<string>, includeInternal = false): Set<string> {
const refs = new Set<string>();
for (const route of root.routes) {
for (const op of route.operations) {
if (!includeInternal && resolveModifiers(route, op).includes('internal')) continue;
if (route.params) collectParamSourceRefs(route.params, refs, modelsWithInput);
if (op.request) {
for (const body of op.request.bodies) collectTypeRefs(body.bodyType, refs, modelsWithInput, true);
}
for (const resp of op.responses) {
if (resp.bodyType) collectTypeRefs(resp.bodyType, refs, modelsWithInput, false);
}
if (op.query) collectParamSourceRefs(op.query, refs, modelsWithInput);
Iif (op.headers) collectParamSourceRefs(op.headers, refs, modelsWithInput);
}
}
return refs;
}
function collectParamSourceRefs(source: ParamSource, out: Set<string>, modelsWithInput?: Set<string>): void {
Iif (source.kind === 'ref') {
addModelRef(source.name, out, modelsWithInput);
} else if (source.kind === 'params') {
for (const p of source.nodes) collectTypeRefs(p.type, out, modelsWithInput);
} else E{
collectTypeRefs(source.node, out, modelsWithInput);
}
}
function addModelRef(name: string, out: Set<string>, modelsWithInput?: Set<string>): void {
Eif (/^[A-Z]/.test(name)) {
out.add(name);
if (modelsWithInput?.has(name)) out.add(`${name}Input`);
}
}
function collectTypeRefs(type: ContractTypeNode, out: Set<string>, modelsWithInput?: Set<string>, forInput = false): void {
switch (type.kind) {
case 'scalar':
switch (type.name) {
case 'date':
out.add('__date__');
break;
case 'time':
out.add('__time__');
break;
case 'datetime':
out.add('__datetime__');
break;
case 'uuid':
out.add('__uuid__');
break;
case 'unknown':
case 'json':
case 'object':
out.add('__any__');
break;
}
break;
case 'ref':
if (forInput && modelsWithInput?.has(type.name)) {
out.add(`${type.name}Input`);
} else {
addModelRef(type.name, out, modelsWithInput);
}
break;
case 'array':
collectTypeRefs(type.item, out, modelsWithInput, forInput);
break;
case 'tuple':
type.items.forEach(t => collectTypeRefs(t, out, modelsWithInput, forInput));
break;
case 'record':
collectTypeRefs(type.key, out, modelsWithInput, forInput);
collectTypeRefs(type.value, out, modelsWithInput, forInput);
break;
case 'union':
type.members.forEach(m => collectTypeRefs(m, out, modelsWithInput, forInput));
break;
case 'discriminatedUnion':
type.members.forEach(m => collectTypeRefs(m, out, modelsWithInput, forInput));
break;
case 'intersection':
out.add('__any__');
break;
case 'lazy':
collectTypeRefs(type.inner, out, modelsWithInput, forInput);
break;
case 'inlineObject':
out.add('__any__');
break;
}
}
// ─── Naming helpers ───────────────────────────────────────────────────────
function deriveBaseName(file: string): string {
const base =
file
.split('/')
.pop()
?.replace(/\.(op\.)?ck$/, '') ?? 'Resource';
return base
.split('.')
.map(s => s.charAt(0).toUpperCase() + s.slice(1))
.join('');
}
export function deriveClientClassName(file: string): string {
return `${deriveBaseName(file)}Client`;
}
export function deriveClientModuleName(file: string): string {
const base =
file
.split('/')
.pop()
?.replace(/\.(op\.)?ck$/, '') ?? 'client';
const clean = base.replace(/[^a-zA-Z0-9]/g, '_').toLowerCase();
return `_client_${clean}`;
}
export function deriveClientPropertyName(file: string): string {
const base = deriveBaseName(file);
return base.charAt(0).toLowerCase() + base.slice(1);
}
function deriveMethodName(op: OpOperationNode, route: OpRouteNode): string {
if (op.sdk) return toSnakeCase(op.sdk);
if (op.name) return toSnakeCase(op.name);
return inferMethodName(op.method, route.path);
}
function inferMethodName(method: string, path: string): string {
const segments = path.split('/').filter(s => s.length > 0);
const parts: string[] = [method.toLowerCase()];
for (const seg of segments) {
if (seg.startsWith('{')) {
const paramName = seg.slice(1, -1);
parts.push('by_' + toSnakeCase(paramName));
} else {
parts.push(toSnakeCase(seg.replace(/[.-]/g, '_')));
}
}
return parts.join('_').replace(/_+/g, '_');
}
function toSnakeCase(s: string): string {
return s
.replace(/([a-z0-9])([A-Z])/g, '$1_$2')
.replace(/[^a-zA-Z0-9]/g, '_')
.toLowerCase()
.replace(/_+/g, '_')
.replace(/^_|_$/g, '');
}
// ─── Shared base client content ───────────────────────────────────────────
export const BASE_CLIENT_PY = `# Auto-generated by contractkit-plugin-python-sdk. Do not edit manually.
from __future__ import annotations
import httpx
from typing import Any
class SdkError(Exception):
def __init__(self, status: int, status_text: str, body: Any):
super().__init__(f"{status} {status_text}")
self.status = status
self.status_text = status_text
self.body = body
class BaseClient:
def __init__(self, base_url: str, headers: dict[str, str] | None = None):
self._base_url = base_url.rstrip("/")
self._headers = headers or {}
self._http = httpx.AsyncClient()
async def _fetch(
self,
path: str,
*,
method: str,
body: Any = None,
params: dict | None = None,
extra_headers: dict | None = None,
content_type: str | None = None,
body_kind: str = "json",
response_kind: str = "json",
) -> Any:
result, _ = await self._fetch_with_headers(
path,
method=method,
body=body,
params=params,
extra_headers=extra_headers,
content_type=content_type,
body_kind=body_kind,
response_kind=response_kind,
)
return result
async def _fetch_with_headers(
self,
path: str,
*,
method: str,
body: Any = None,
params: dict | None = None,
extra_headers: dict | None = None,
content_type: str | None = None,
body_kind: str = "json",
response_kind: str = "json",
) -> tuple[Any, dict[str, str]]:
headers = {**self._headers, **(extra_headers or {})}
if body is not None:
headers["Content-Type"] = content_type or "application/json"
# body_kind controls how httpx serializes the request body:
# "json" — body is a JSON-serializable object, sent via httpx's json= kwarg
# "text"/"binary" — body is a raw str/bytes payload, sent via content= unchanged
request_kwargs: dict[str, Any] = {"method": method, "url": f"{self._base_url}{path}", "params": params, "headers": headers}
if body is not None:
if body_kind == "json":
request_kwargs["json"] = body
else:
request_kwargs["content"] = body
response = await self._http.request(**request_kwargs)
if not response.is_success:
try:
error_body = response.json()
except Exception:
error_body = response.text
raise SdkError(response.status_code, response.reason_phrase, error_body)
# HTTP headers are case-insensitive — normalize to lowercase keys for stable lookup.
response_headers = {k.lower(): v for k, v in response.headers.items()}
if response.status_code == 204 or not response.content:
return None, response_headers
if response_kind == "text":
return response.text, response_headers
if response_kind == "binary":
return response.content, response_headers
return response.json(), response_headers
`;
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