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const log = require('loglevel')
/**
* JSON-RPC error object
*
* @typedef {Object} RpcError
* @property {number} code - Indicates the error type that occurred
* @property {Object} [data] - Contains additional information about the error
* @property {string} [message] - Short description of the error
*/
/**
* Middleware configuration object
*
* @typedef {Object} MiddlewareConfig
* @property {boolean} [override] - Use RPC_ERRORS message in place of provider message
*/
/**
* Map of standard and non-standard RPC error codes to messages
*/
const RPC_ERRORS = {
1: 'An unauthorized action was attempted.',
2: 'A disallowed action was attempted.',
3: 'An execution error occurred.',
[-32600]: 'The JSON sent is not a valid Request object.',
[-32601]: 'The method does not exist / is not available.',
[-32602]: 'Invalid method parameter(s).',
[-32603]: 'Internal JSON-RPC error.',
[-32700]: 'Invalid JSON was received by the server. An error occurred on the server while parsing the JSON text.',
internal: 'Internal server error.',
unknown: 'Unknown JSON-RPC error.',
}
/**
* Modifies a JSON-RPC error object in-place to add a human-readable message,
* optionally overriding any provider-supplied message
*
* @param {RpcError} error - JSON-RPC error object
* @param {boolean} override - Use RPC_ERRORS message in place of provider message
*/
function sanitizeRPCError (error, override) {
if (error.message && !override) { return error }
const message = error.code > -31099 && error.code < -32100 ? RPC_ERRORS.internal : RPC_ERRORS[error.code]
error.message = message || RPC_ERRORS.unknown
}
/**
* json-rpc-engine middleware that both logs standard and non-standard error
* messages and ends middleware stack traversal if an error is encountered
*
* @param {MiddlewareConfig} [config={override:true}] - Middleware configuration
* @returns {Function} json-rpc-engine middleware function
*/
function createErrorMiddleware ({ override = true } = {}) {
return (req, res, next) => {
next(done => {
const { error } = res
if (!error) { return done() }
sanitizeRPCError(error)
log.error(`MetaMask - RPC Error: ${error.message}`, error)
done()
})
}
}
module.exports = createErrorMiddleware
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