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// Define as CommonJS export:
Eif (typeof require === 'function' && typeof exports === 'object') {
module.exports = factory(); // eslint-disable-line
}
// Define as AMD:
else if (typeof define === 'function' && define.amd) { // eslint-disable-line no-undef
define([], factory); // eslint-disable-line no-undef
}
// Browser:
else {
window.JsonRPC = factory(); // eslint-disable-line no-undef
}
})(() => {
/**
* List of errors
*
* @type {object}
*/
const ERRORS = {
// codes from -32000 to -32099 reserved for implementation-defined server-errors.
INVALID_REQUEST: {
code: -32600,
message: 'Invalid Request'
},
METHOD_NOT_FOUND: {
code: -32601,
message: 'Method not found'
},
INVALID_PARAMS: {
code: -32602,
message: 'Invalid params'
},
INTERNAL_ERROR: {
code: -32603,
message: 'Internal error'
},
PARSE_ERROR: {
code: -32700,
message: 'Parse error'
}
};
/**
* List of supported message types
*
* @type {object}
*/
const MESSAGE_TYPES = {
REQUEST: 'request',
INTERNAL_REQUEST: 'internal_request',
NOTIFICATION: 'notification',
INTERNAL_NOTIFICATION: 'internal_notification',
RESPONSE: 'response',
ERROR: 'error',
BATCH: 'batch'
};
/**
* Contains prefix of name of all messages for internal usage
*
* @type {string}
*/
const INTERNAL_MESSAGE_PREFIX = 'rpc.';
/**
* Constructor of error object, that should be thrown from "parse" method
*
* @param {object} error
*
* @constructor
*/
function ParserError(error) {
this.name = 'ParserError';
this.message = 'Failed to parse JSON-RPC message';
this.rpcError = error;
Eif (Error.captureStackTrace) {
Error.captureStackTrace(this, ParserError);
}
else {
this.stack = (new Error()).stack;
}
}
ParserError.prototype = Object.create(Error.prototype);
ParserError.prototype.constructor = ParserError;
/**
* Utility function for assertion
*
* @param {boolean} condition
* @param {string} errorText
*
* @returns {void}
*
* @throws Error if condition is falsy
*/
function assert(condition, errorText) {
if (!condition) {
throw new Error(errorText);
}
}
/**
* Utility function to create basic JSON-RPC message
*
* @param {number|string|undefined} id?
* @param {object} messageData?
*
* @returns {object}
*
* @private
*/
function _createMessage(id, messageData = null) {
if (id !== undefined && id !== null) {
if (typeof id === 'string') {
assert(id.length > 0, 'ID of message is not defined');
}
else {
assert(Number.isInteger(id), `ID should be a string or an integer number, "${typeof id}" given`);
}
}
const message = {
jsonrpc: '2.0',
...messageData
};
if (id !== undefined) {
message.id = id;
}
return message;
}
/**
* Create a JSON-RPC request object ( https://www.jsonrpc.org/specification#request_object )
*
* @param {number|string|undefined} id
* @param {string} method
* @param {object|array|undefined} params
* @param {boolean} isInternal
*
* @returns {object}
*
* @private
*/
function _createRequestObject(id, method, params, isInternal) {
assert(typeof method === 'string', 'Method should be a string');
assert(method.trim().length > 0, 'Method name should not be empty');
if (!isInternal) {
assert(method.indexOf(INTERNAL_MESSAGE_PREFIX) !== 0, `Invalid method name "${method}": only internal methods can be prefixed with "${INTERNAL_MESSAGE_PREFIX}"`);
}
if (params !== undefined && params !== null) {
assert(
Array.isArray(params) || typeof params === 'object',
`Request parameters must be a structured value (an array or an object), "${typeof params}" given`
);
}
if (isInternal) {
if (method.indexOf(INTERNAL_MESSAGE_PREFIX) !== 0) {
method = `${INTERNAL_MESSAGE_PREFIX}${method}`;
}
}
let messageData = {method};
if (params) {
messageData.params = params;
}
return _createMessage(id, messageData);
}
/**
* Utility function to create JSON-RPC request
*
* @param {number|string} id
* @param {string} method
* @param {object|array|undefined} params
* @param {boolean} isInternal
*
* @returns {object}
*
* @private
*/
function _createRequest(id, method, params, isInternal) {
assert(id !== undefined && id !== null, 'ID of request is not defined');
return _createRequestObject(id, method, params, isInternal);
}
/**
* Utility function to create JSON-RPC notification
*
* @param {string} method
* @param {object|array|undefined} params
* @param {boolean} isInternal
*
* @returns {object}
*
* @private
*/
function _createNotification(method, params, isInternal) {
return _createRequestObject(undefined, method, params, isInternal);
}
/**
* Utility function to create JSON-RPC response
*
* @param {number|string} id
* @param {object} responseData
*
* @returns {object}
*
* @private
*/
function _createResponse(id, responseData) {
assert(id !== undefined, 'ID of response is not defined');
return _createMessage(id, responseData);
}
/**
* Creates a response error object ( https://www.jsonrpc.org/specification#error_object )
*
* @param {Number|{code: int, message: string?}} errorData - error code
* @param {*} additionalData? - error details
*
* @return {Object}
*/
function _createErrorObject(errorData, additionalData) {
if (Number.isInteger(errorData)) {
errorData = {code: errorData};
}
assert(
typeof errorData === 'object' && errorData !== null && !Array.isArray(errorData),
'Error code should be an integer number or object with "code" and "message" property'
);
assert(errorData.message === undefined || typeof errorData.message === 'string', 'Error message should be a string');
assert(Number.isInteger(errorData.code), 'Error code should be an integer value');
if (!errorData.message) {
let errorInRegistry = Object.values(ERRORS).find(
error => error.code === errorData.code
);
errorData.message = errorInRegistry ? errorInRegistry.message : 'Internal Server Error';
}
const errorObj = {...errorData};
if (additionalData !== null && additionalData !== undefined) {
errorObj.data = additionalData;
}
return errorObj;
}
/**
* Creates new JSON-RPC request
*
* @param {number|string} id
* @param {string} method
* @param {object|array|undefined} params
*
* @returns {object}
*/
function createRequest(id, method, params) {
return _createRequest(id, method, params, false);
}
/**
* Creates new internal JSON-RPC request
*
* @param {number|string} id
* @param {string} method
* @param {object|array|undefined} params
*
* @returns {object}
*/
function createInternalRequest(id, method, params) {
return _createRequest(id, method, params, true);
}
/**
* Creates new JSON-RPC notification
*
* @param {string} method
* @param {object|array|undefined} params
*
* @returns {object}
*/
function createNotification(method, params) {
return _createNotification(method, params, false);
}
/**
* Creates new internal JSON-RPC notification
*
* @param {string} method
* @param {object|array|undefined} params
*
* @returns {object}
*/
function createInternalNotification(method, params) {
return _createNotification(method, params, true);
}
/**
* Creates JSON-RPC response
*
* @param {number|string} id
* @param {*} result
*
* @returns {object}
*
* @private
*/
function createResponse(id, result) {
assert(id !== undefined && id !== null, 'Response ID is not defined');
assert(result !== undefined, 'Response result is not defined');
return _createResponse(id, {result});
}
/**
* Creates JSON-RPC response with error
*
* @param {number|string} id
* @param {number|{code: number, message: string?}} errorCode
* @param {object} details?
*
* @returns {object}
*/
function createError(id, errorCode, details) {
return _createResponse(id, {error: _createErrorObject(errorCode, details)});
}
/**
* Parses passed message
*
* @param {string|object|array} message - JSON string or object or array or requests (batch)
*
* @returns {Array|object}
*/
function parseMessage(message) {
let result;
// Prase JSON string into object:
if (typeof message === 'string') {
try {
message = JSON.parse(message);
}
catch (e) {
throw new ParserError(createError(null, ERRORS.PARSE_ERROR));
}
}
// If message is an array then it's a batch, so we need to parse every request in this
// batch separately
// (unless we already parsing a batch - in that case parse error should be returned):
if (Array.isArray(message)) {
if (message.length === 0) {
throw new ParserError(createError(null, ERRORS.INVALID_REQUEST));
}
result = {
type: MESSAGE_TYPES.BATCH,
payload: message.map((request) => {
let msg;
try {
msg = parseMessage(request, false);
}
catch (e) {
Eif (e instanceof ParserError) {
msg = e;
}
}
return msg;
})
};
}
// If message is normal js object, so we need to validate it and determine it's type:
else if (typeof message === 'object') {
// The only supported version is JSON-RPC 2.0:
if (message.jsonrpc !== '2.0') {
let id = message.id || null;
throw new ParserError(createError(id, ERRORS.INTERNAL_ERROR));
}
if (message.hasOwnProperty('method')) {
if (message.hasOwnProperty('params')) {
if (typeof message.params !== 'object' || message.params === null) {
throw new ParserError(
createError(message.id || null, ERRORS.INVALID_REQUEST)
);
}
}
if (typeof message.method !== 'string' || message.method.trim().length === 0) {
throw new ParserError(
createError(message.id || null, ERRORS.INVALID_REQUEST)
);
}
if (message.id) {
result = {
type: message.method.indexOf(INTERNAL_MESSAGE_PREFIX) === 0
? MESSAGE_TYPES.INTERNAL_REQUEST
: MESSAGE_TYPES.REQUEST,
payload: {
id: message.id,
method: message.method,
params: message.params
}
};
}
else {
result = {
type: message.method.indexOf(INTERNAL_MESSAGE_PREFIX) === 0
? MESSAGE_TYPES.INTERNAL_NOTIFICATION
: MESSAGE_TYPES.NOTIFICATION,
payload: {
method: message.method,
params: message.params
}
};
}
}
else {
if (!message.id) {
throw new ParserError(createError(null, ERRORS.INVALID_REQUEST));
}
if (
(message.result && message.error) ||
(!message.result && !message.error)
) {
throw new ParserError(createError(message.id, ERRORS.INVALID_REQUEST));
}
else if (message.result) {
result = {
type: MESSAGE_TYPES.RESPONSE,
payload: {
id: message.id,
result: message.result
}
};
}
else {
if (typeof message.error !== 'object' || message.error === null || Array.isArray(message.error)) {
throw new ParserError(createError(message.id, ERRORS.INVALID_REQUEST));
}
if (!message.error.hasOwnProperty('code') || !Number.isInteger(message.error.code)) {
throw new ParserError(createError(message.id, ERRORS.INVALID_REQUEST));
}
if (!message.error.hasOwnProperty('message') || typeof message.error.message !== 'string') {
throw new ParserError(createError(message.id, ERRORS.INVALID_REQUEST));
}
result = {
type: MESSAGE_TYPES.ERROR,
payload: {
id: message.id,
error: message.error
}
};
}
}
}
// If message is not an array and is not an object - it is invalid, so return an error:
else {
throw new ParserError(createError(null, ERRORS.INVALID_REQUEST));
}
return result;
}
return {
ERRORS,
MESSAGE_TYPES,
INTERNAL_MESSAGE_PREFIX,
ParserError,
createRequest,
createInternalRequest,
createNotification,
createInternalNotification,
createResponse,
createError,
parseMessage
};
});
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