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* JSON-RPC protocol utilities for the serve command
*/
import IJsonRpcRequest from "./types/IJsonRpcRequest";
import IJsonRpcResponse from "./types/IJsonRpcResponse";
/** Standard JSON-RPC error codes */
const ERROR_PARSE = -32700;
const ERROR_INVALID_REQUEST = -32600;
const ERROR_METHOD_NOT_FOUND = -32601;
const ERROR_INVALID_PARAMS = -32602;
const ERROR_INTERNAL = -32603;
/**
* Result of parsing a JSON-RPC request
*/
interface IParseResult {
success: boolean;
request?: IJsonRpcRequest;
error?: IJsonRpcResponse;
}
/**
* JSON-RPC protocol handler
*/
class JsonRpcHandler {
/** Method not found code */
static readonly ERROR_METHOD_NOT_FOUND = ERROR_METHOD_NOT_FOUND;
/** Invalid params code */
static readonly ERROR_INVALID_PARAMS = ERROR_INVALID_PARAMS;
/** Internal error code */
static readonly ERROR_INTERNAL = ERROR_INTERNAL;
/**
* Parse a JSON-RPC request from a line of input
* @param line - Raw input line
* @returns Parse result with request or error response
*/
static parseRequest(line: string): IParseResult {
// Try to parse JSON
let parsed: unknown;
try {
parsed = JSON.parse(line);
} catch {
return {
success: false,
error: this.formatError(null, ERROR_PARSE, "Parse error"),
};
}
// Validate structure
if (typeof parsed !== "object" || parsed === null) {
return {
success: false,
error: this.formatError(null, ERROR_INVALID_REQUEST, "Invalid request"),
};
}
const obj = parsed as Record<string, unknown>;
// Check for required fields
if (!("id" in obj) || !("method" in obj)) {
return {
success: false,
error: this.formatError(null, ERROR_INVALID_REQUEST, "Invalid request"),
};
}
// Validate id type
const id = obj.id;
if (typeof id !== "number" && typeof id !== "string") {
return {
success: false,
error: this.formatError(null, ERROR_INVALID_REQUEST, "Invalid request"),
};
}
// Validate method type
const method = obj.method;
if (typeof method !== "string") {
return {
success: false,
error: this.formatError(id, ERROR_INVALID_REQUEST, "Invalid request"),
};
}
// Validate params if present
const params = obj.params;
if (
params !== undefined &&
(typeof params !== "object" || params === null)
) {
return {
success: false,
error: this.formatError(id, ERROR_INVALID_PARAMS, "Invalid params"),
};
}
return {
success: true,
request: {
id,
method,
params: params as Record<string, unknown> | undefined,
},
};
}
/**
* Format a success response
* @param id - Request identifier
* @param result - Result value
* @returns JSON-RPC response object
*/
static formatResponse(
id: number | string | null,
result: unknown,
): IJsonRpcResponse {
return {
id: id ?? 0,
result,
};
}
/**
* Format an error response
* @param id - Request identifier (null if unknown)
* @param code - Error code
* @param message - Error message
* @param data - Optional additional error context
* @returns JSON-RPC response object
*/
static formatError(
id: number | string | null,
code: number,
message: string,
data?: unknown,
): IJsonRpcResponse {
const error: { code: number; message: string; data?: unknown } = {
code,
message,
};
if (data !== undefined) {
error.data = data;
}
return {
id: id ?? 0,
error,
};
}
}
export default JsonRpcHandler;
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