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import { USER_AGENT } from './consts';
import {
type ExecuteOptions,
type HttpBodyType,
type HttpExecuteConfig,
type JsonObject,
ParameterLocation,
} from './types';
import { StackOneAPIError } from './utils/error-stackone-api';
interface SerializationOptions {
maxDepth?: number;
strictValidation?: boolean;
}
class ParameterSerializationError extends Error {
constructor(message: string, options?: ErrorOptions) {
super(message, options);
this.name = 'ParameterSerializationError';
}
}
/**
* Convert a JsonValue to a string representation suitable for URLs and form data.
* Objects and arrays are JSON-stringified, primitives are converted directly.
*/
function stringifyValue(value: JsonValue): string {
Eif (typeof value === 'string') {
return value;
}
if (typeof value === 'number' || typeof value === 'boolean') {
return String(value);
}
if (value === null) {
return '';
}
// Arrays and objects
return JSON.stringify(value);
}
/**
* Builds and executes HTTP requests for tools declared with kind:'http'.
*/
export class RequestBuilder {
private method: string;
private url: string;
private bodyType: HttpBodyType;
private params: HttpExecuteConfig['params'];
private headers: Record<string, string>;
constructor(config: HttpExecuteConfig, headers: Record<string, string> = {}) {
this.method = config.method;
this.url = config.url;
this.bodyType = config.bodyType;
this.params = config.params;
this.headers = { ...headers };
}
/**
* Set headers for the request
*/
setHeaders(headers: Record<string, string>): RequestBuilder {
this.headers = { ...this.headers, ...headers };
return this;
}
/**
* Get the current headers
*/
getHeaders(): Record<string, string> {
return { ...this.headers };
}
/**
* Prepare headers for the API request
*/
prepareHeaders(): Record<string, string> {
return {
'User-Agent': USER_AGENT,
...this.headers,
};
}
/**
* Prepare URL and parameters for the API request
*/
prepareRequestParams(params: JsonObject): [string, JsonObject, JsonObject] {
let url = this.url;
const bodyParams: JsonObject = {};
const queryParams: JsonObject = {};
for (const [key, value] of Object.entries(params)) {
// Find the parameter configuration in the params array
const paramConfig = this.params.find((p) => p.name === key);
const paramLocation = paramConfig?.location;
switch (paramLocation) {
case ParameterLocation.PATH:
// Replace path parameter in URL
url = url.replace(`{${key}}`, encodeURIComponent(stringifyValue(value)));
break;
case ParameterLocation.QUERY:
// Add to query parameters
queryParams[key] = value;
break;
case ParameterLocation.HEADER:
// Add to headers
this.headers[key] = stringifyValue(value);
break;
case ParameterLocation.BODY:
// Add to body parameters
bodyParams[key] = value;
break;
default:
paramLocation satisfies undefined; // exhaustive check
// Default to body parameters
bodyParams[key] = value;
break;
}
}
return [url, bodyParams, queryParams];
}
/**
* Build the fetch options for the request
*/
buildFetchOptions(bodyParams: JsonObject): RequestInit {
const headers = this.prepareHeaders();
const fetchOptions: RequestInit = {
method: this.method,
headers,
};
// Handle different body types
if (Object.keys(bodyParams).length > 0) {
switch (this.bodyType) {
case 'json': {
const headersRecord = fetchOptions.headers as Record<string, string>;
fetchOptions.headers = {
...headersRecord,
'Content-Type': 'application/json',
};
fetchOptions.body = JSON.stringify(bodyParams);
break;
}
case 'form': {
const headersRecord = fetchOptions.headers as Record<string, string>;
fetchOptions.headers = {
...headersRecord,
'Content-Type': 'application/x-www-form-urlencoded',
};
const formBody = new URLSearchParams();
for (const [key, value] of Object.entries(bodyParams)) {
formBody.append(key, stringifyValue(value));
}
fetchOptions.body = formBody.toString();
break;
}
case 'multipart-form': {
// Handle file uploads
const formData = new FormData();
for (const [key, value] of Object.entries(bodyParams)) {
formData.append(key, stringifyValue(value));
}
fetchOptions.body = formData;
// Don't set Content-Type for FormData, it will be set automatically with the boundary
break;
}
default: {
this.bodyType satisfies never;
throw new Error(`Unsupported HTTP body type: ${String(this.bodyType)}`);
}
}
}
return fetchOptions;
}
/**
* Validates parameter keys to prevent injection attacks
*/
private validateParameterKey(key: string): void {
if (!/^[a-zA-Z0-9_.-]+$/.test(key)) {
throw new ParameterSerializationError(`Invalid parameter key: ${key}`);
}
}
/**
* Safely serializes values to strings with special type handling
*/
private serializeValue(value: unknown): string {
if (value instanceof Date) {
return value.toISOString();
}
if (value instanceof RegExp) {
return value.toString();
}
if (typeof value === 'function') {
throw new ParameterSerializationError('Functions cannot be serialized as parameters');
}
Iif (value == null) {
return '';
}
if (typeof value === 'string') {
return value;
}
if (typeof value === 'number' || typeof value === 'boolean') {
return String(value);
}
// For objects and arrays, use JSON serialization
return JSON.stringify(value);
}
/**
* Serialize an object into deep object query parameters with security protections
* Converts {filter: {updated_after: "2020-01-01", job_id: "123"}}
* to filter[updated_after]=2020-01-01&filter[job_id]=123
*/
private serializeDeepObject(
obj: unknown,
prefix: string,
depth = 0,
visited = new WeakSet<object>(),
options: SerializationOptions = {},
): [string, string][] {
const maxDepth = options.maxDepth ?? 10;
const strictValidation = options.strictValidation ?? true;
const params: [string, string][] = [];
// Recursion depth protection
if (depth > maxDepth) {
throw new ParameterSerializationError(
`Maximum nesting depth (${maxDepth}) exceeded for parameter serialization`,
);
}
Iif (obj == null) {
return params;
}
if (typeof obj === 'object' && !Array.isArray(obj)) {
// Circular reference protection
if (visited.has(obj)) {
throw new ParameterSerializationError('Circular reference detected in parameter object');
}
visited.add(obj);
try {
for (const [key, value] of Object.entries(obj as Record<string, unknown>)) {
Eif (strictValidation) {
this.validateParameterKey(key);
}
const nestedKey = `${prefix}[${key}]`;
if (value != null) {
if (this.shouldUseDeepObjectSerialization(key, value)) {
// Recursively handle nested objects
params.push(
...this.serializeDeepObject(value, nestedKey, depth + 1, visited, options),
);
} else {
params.push([nestedKey, this.serializeValue(value)]);
}
}
}
} finally {
// Remove from visited set to allow the same object in different branches
visited.delete(obj);
}
} else E{
// For non-object values, use the prefix as-is
params.push([prefix, this.serializeValue(obj)]);
}
return params;
}
/**
* Check if a parameter should use deep object serialization
* Applies to all plain object parameters (excludes special types and arrays)
*/
private shouldUseDeepObjectSerialization(_key: string, value: unknown): boolean {
return (
typeof value === 'object' &&
value !== null &&
!Array.isArray(value) &&
!(value instanceof Date) &&
!(value instanceof RegExp) &&
typeof value !== 'function'
);
}
/**
* Builds all query parameters with optimized batching
*/
private buildQueryParameters(queryParams: JsonObject): [string, string][] {
const allParams: [string, string][] = [];
for (const [key, value] of Object.entries(queryParams)) {
if (this.shouldUseDeepObjectSerialization(key, value)) {
// Use deep object serialization for complex parameters
allParams.push(...this.serializeDeepObject(value, key));
} else {
// Use safe string conversion for primitive values
allParams.push([key, this.serializeValue(value)]);
}
}
return allParams;
}
/**
* Execute the request
*/
async execute(params: JsonObject, options?: ExecuteOptions): Promise<JsonObject> {
// Prepare request parameters
const [url, bodyParams, queryParams] = this.prepareRequestParams(params);
// Prepare URL with query parameters using optimized batching
const urlWithQuery = new URL(url);
const serializedParams = this.buildQueryParameters(queryParams);
// Batch append all parameters
for (const [paramKey, paramValue] of serializedParams) {
urlWithQuery.searchParams.append(paramKey, paramValue);
}
// Build fetch options
const fetchOptions = this.buildFetchOptions(bodyParams);
// If dryRun is true, return the request details instead of making the API call
if (options?.dryRun) {
// Convert headers to a plain object for JSON serialization
const headersObj =
fetchOptions.headers instanceof Headers
? Object.fromEntries(fetchOptions.headers.entries())
: Array.isArray(fetchOptions.headers)
? Object.fromEntries(fetchOptions.headers)
: (fetchOptions.headers ?? {});
// Convert body to a JSON-serialisable value
const bodyValue =
fetchOptions.body instanceof FormData
? '[FormData]'
: typeof fetchOptions.body === 'string'
? fetchOptions.body
: null;
return {
url: urlWithQuery.toString(),
method: this.method,
headers: headersObj,
body: bodyValue,
mappedParams: params,
} satisfies JsonObject;
}
// Execute the request
const response = await fetch(urlWithQuery.toString(), fetchOptions);
// Check if the response is OK
if (!response.ok) {
const responseBody = await response.json().catch(() => null);
throw new StackOneAPIError(
`API request failed with status ${response.status} for ${url}`,
response.status,
responseBody,
bodyParams,
);
}
// Parse the response
return (await response.json()) as JsonObject;
}
}
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