@metamask/snaps-rpc-methods
Version:
MetaMask Snaps JSON-RPC method implementations
44 lines • 1.5 kB
JavaScript
import { rpcErrors } from "@metamask/rpc-errors";
import { AuxiliaryFileEncoding, enumValue } from "@metamask/snaps-sdk";
import { object, optional, string, union } from "@metamask/superstruct";
import { assertStruct } from "@metamask/utils";
export const GetFileArgsStruct = object({
path: string(),
encoding: optional(union([
enumValue(AuxiliaryFileEncoding.Base64),
enumValue(AuxiliaryFileEncoding.Hex),
enumValue(AuxiliaryFileEncoding.Utf8),
])),
});
const hookNames = {
getSnapFile: true,
};
export const getFileHandler = {
methodNames: ['snap_getFile'],
implementation,
hookNames,
};
/**
* The `snap_getFile` 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.getSnapFile - The function to load a static snap file.
* @returns Nothing.
*/
async function implementation(req, res, _next, end, { getSnapFile }) {
const { params } = req;
assertStruct(params, GetFileArgsStruct, 'Invalid "snap_getFile" parameters', rpcErrors.invalidParams);
try {
res.result = await getSnapFile(params.path, params.encoding ?? AuxiliaryFileEncoding.Base64);
}
catch (error) {
return end(error);
}
return end();
}
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