@metamask/snaps-rpc-methods
Version:
MetaMask Snaps JSON-RPC method implementations
69 lines • 2.37 kB
JavaScript
import { providerErrors, rpcErrors } from "@metamask/rpc-errors";
import { union } from "@metamask/snaps-sdk";
import { create, object, number, string, array, StructError } from "@metamask/superstruct";
import { SnapEndowments } from "../endowments/index.mjs";
const hookNames = {
hasPermission: true,
sendWebSocketMessage: true,
};
const SendWebSocketMessageParametersStruct = object({
id: string(),
message: union([string(), array(number())]),
});
/**
* Handler for the `snap_sendWebSocketMessage` method.
*/
export const sendWebSocketMessageHandler = {
methodNames: ['snap_sendWebSocketMessage'],
implementation: sendWebSocketMessageImplementation,
hookNames,
};
/**
* The `snap_sendWebSocketMessage` method implementation.
*
* @param req - The JSON-RPC request object.
* @param res - The JSON-RPC response object.
* @param _next - The `json-rpc-engine` "next" callback. Not used by this function.
* @param end - The `json-rpc-engine` "end" callback.
* @param hooks - The RPC method hooks.
* @param hooks.hasPermission - The function to check if a snap has the `endowment:network-access` permission.
* @param hooks.sendWebSocketMessage - The function to send a WebSocket message.
* @returns Nothing.
*/
function sendWebSocketMessageImplementation(req, res, _next, end, { hasPermission, sendWebSocketMessage }) {
if (!hasPermission(SnapEndowments.NetworkAccess)) {
return end(providerErrors.unauthorized());
}
const { params } = req;
try {
const { id, message } = getValidatedParams(params);
sendWebSocketMessage(id, message);
res.result = null;
}
catch (error) {
return end(error);
}
return end();
}
/**
* Validates the parameters for the snap_sendWebSocketMessage method.
*
* @param params - Parameters to validate.
* @returns Validated parameters.
* @throws Throws RPC error if validation fails.
*/
function getValidatedParams(params) {
try {
return create(params, SendWebSocketMessageParametersStruct);
}
catch (error) {
if (error instanceof StructError) {
throw rpcErrors.invalidParams({
message: `Invalid params: ${error.message}.`,
});
}
/* istanbul ignore next */
throw rpcErrors.internal();
}
}
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