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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import * as permissionsOps from "../ops/permissions.ts";
import { EventTargetImpl as EventTarget } from "./event_target.ts";
const permissionNames = [
"read",
"write",
"net",
"env",
"run",
"plugin",
"hrtime",
] as const;
type PermissionName = typeof permissionNames[number];
interface RunPermissionDescriptor {
name: "run";
}
interface ReadPermissionDescriptor {
name: "read";
path?: string;
}
interface WritePermissionDescriptor {
name: "write";
path?: string;
}
interface NetPermissionDescriptor {
name: "net";
url?: string;
}
interface EnvPermissionDescriptor {
name: "env";
}
interface PluginPermissionDescriptor {
name: "plugin";
}
interface HrtimePermissionDescriptor {
name: "hrtime";
}
type DenoPermissionDescriptor =
| RunPermissionDescriptor
| ReadPermissionDescriptor
| WritePermissionDescriptor
| NetPermissionDescriptor
| EnvPermissionDescriptor
| PluginPermissionDescriptor
| HrtimePermissionDescriptor;
interface StatusCacheValue {
state: PermissionState;
status: PermissionStatusImpl;
}
export class PermissionStatusImpl extends EventTarget
implements PermissionStatus {
#state: { state: PermissionState };
// eslint-disable-next-line @typescript-eslint/no-explicit-any
onchange: ((this: PermissionStatus, event: Event) => any) | null = null;
get state(): PermissionState {
return this.#state.state;
}
constructor(state: { state: PermissionState }) {
super();
this.#state = state;
}
dispatchEvent(event: Event): boolean {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
let dispatched = super.dispatchEvent(event as any);
if (dispatched && this.onchange) {
this.onchange.call(this, event);
dispatched = !event.defaultPrevented;
}
return dispatched;
}
get [Symbol.toStringTag](): string {
return "PermissionStatus";
}
}
/** A cache of `PermissionStatus` objects and their last known state. */
const statusCache = new Map<string, StatusCacheValue>();
/** Cache the state of a descriptor and return its `PermissionStatus`. */
function cache(
desc: DenoPermissionDescriptor,
state: PermissionState
): PermissionStatusImpl {
let key = desc.name;
if ((desc.name === "read" || desc.name === "write") && desc.path) {
key += `-${desc.path}`;
} else if (desc.name === "net" && desc.url) {
key += `-${desc.url}`;
}
if (statusCache.has(key)) {
const status = statusCache.get(key)!;
if (status.state !== state) {
status.state = state;
status.status.dispatchEvent(new Event("change", { cancelable: false }));
}
return status.status;
}
const status: { state: PermissionState; status?: PermissionStatusImpl } = {
state,
};
status.status = new PermissionStatusImpl(status);
statusCache.set(key, status as StatusCacheValue);
return status.status;
}
function isValidDescriptor(
desc: PermissionDescriptor | DenoPermissionDescriptor
): desc is DenoPermissionDescriptor {
return permissionNames.includes(desc.name as PermissionName);
}
export class PermissionsImpl implements Permissions {
query(
desc: PermissionDescriptor | DenoPermissionDescriptor
): Promise<PermissionStatus> {
if (!isValidDescriptor(desc)) {
return Promise.reject(
new TypeError(
`The provided value "${desc.name}" is not a valid permission name.`
)
);
}
const state = permissionsOps.query(desc);
return Promise.resolve(cache(desc, state) as PermissionStatus);
}
revoke(
desc: PermissionDescriptor | DenoPermissionDescriptor
): Promise<PermissionStatus> {
if (!isValidDescriptor(desc)) {
return Promise.reject(
new TypeError(
`The provided value "${desc.name}" is not a valid permission name.`
)
);
}
const state = permissionsOps.revoke(desc);
return Promise.resolve(cache(desc, state) as PermissionStatus);
}
request(
desc: PermissionDescriptor | DenoPermissionDescriptor
): Promise<PermissionStatus> {
if (!isValidDescriptor(desc)) {
return Promise.reject(
new TypeError(
`The provided value "${desc.name}" is not a valid permission name.`
)
);
}
const state = permissionsOps.request(desc);
return Promise.resolve(cache(desc, state) as PermissionStatus);
}
}
Object.defineProperty(PermissionStatusImpl, "name", {
value: "PermissionStatus",
configurable: true,
});
Object.defineProperty(PermissionsImpl, "name", {
value: "Permissions",
configurable: true,
});
|
