@metamask/snaps-rpc-methods/dist/permitted/getState.mjs

MetaMask Snaps JSON-RPC method implementations

import { providerErrors, rpcErrors } from "@metamask/rpc-errors";
import { boolean, create, object, optional, StructError } from "@metamask/superstruct";
import { hasProperty, isObject } from "@metamask/utils";
import { manageStateBuilder } from "../restricted/manageState.mjs";
import { FORBIDDEN_KEYS, StateKeyStruct } from "../utils.mjs";
const hookNames = {
    hasPermission: true,
    getSnapState: true,
    getUnlockPromise: true,
};
/**
 * `snap_getState` gets the state of the Snap.
 */
export const getStateHandler = {
    methodNames: ['snap_getState'],
    implementation: getStateImplementation,
    hookNames,
};
const GetStateParametersStruct = object({
    key: optional(StateKeyStruct),
    encrypted: optional(boolean()),
});
/**
 * The `snap_getState` method implementation.
 *
 * @param request - The JSON-RPC request object.
 * @param response - 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 - Check whether a given origin has a given
 * permission.
 * @param hooks.getSnapState - Get the state of the requesting Snap.
 * @param hooks.getUnlockPromise - Wait for the extension to be unlocked.
 * @returns Nothing.
 */
async function getStateImplementation(request, 
// `GetStateResult` is an alias for `Json` (which is the default type argument
// for `PendingJsonRpcResponse`), but that may not be the case in the future.
// We use `GetStateResult` here to make it clear that this is the expected
// type of the result.
// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-arguments
response, _next, end, { hasPermission, getSnapState, getUnlockPromise }) {
    const { params } = request;
    if (!hasPermission(manageStateBuilder.targetName)) {
        return end(providerErrors.unauthorized());
    }
    try {
        const validatedParams = getValidatedParams(params);
        const { key, encrypted = true } = validatedParams;
        if (encrypted) {
            await getUnlockPromise(true);
        }
        const state = await getSnapState(encrypted);
        response.result = get(state, key);
    }
    catch (error) {
        return end(error);
    }
    return end();
}
/**
 * Validate the parameters of the `snap_getState` method.
 *
 * @param params - The parameters to validate.
 * @returns The validated parameters.
 */
function getValidatedParams(params) {
    try {
        return create(params, GetStateParametersStruct);
    }
    catch (error) {
        if (error instanceof StructError) {
            throw rpcErrors.invalidParams({
                message: `Invalid params: ${error.message}.`,
            });
        }
        /* istanbul ignore next */
        throw rpcErrors.internal();
    }
}
/**
 * Get the value of a key in an object. The key may contain Lodash-style path
 * syntax, e.g., `a.b.c` (with the exception of array syntax). If the key does
 * not exist, `null` is returned.
 *
 * This is a simplified version of Lodash's `get` function, but Lodash doesn't
 * seem to be maintained anymore, so we're using our own implementation.
 *
 * @param value - The object to get the key from.
 * @param key - The key to get.
 * @returns The value of the key in the object, or `null` if the key does not
 * exist.
 */
export function get(value, key) {
    if (key === undefined) {
        return value;
    }
    const keys = key.split('.');
    let result = value;
    // Intentionally using a classic for loop here for performance reasons.
    // eslint-disable-next-line @typescript-eslint/prefer-for-of
    for (let i = 0; i < keys.length; i++) {
        const currentKey = keys[i];
        if (FORBIDDEN_KEYS.includes(currentKey)) {
            throw rpcErrors.invalidParams('Invalid params: Key contains forbidden characters.');
        }
        if (isObject(result)) {
            if (!hasProperty(result, currentKey)) {
                return null;
            }
            result = result[currentKey];
            continue;
        }
        return null;
    }
    return result;
}
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