mirror of
https://github.com/tauri-apps/tauri.git
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109 lines
2.9 KiB
TypeScript
109 lines
2.9 KiB
TypeScript
// Copyright 2019-2021 Tauri Programme within The Commons Conservancy
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// SPDX-License-Identifier: Apache-2.0
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// SPDX-License-Identifier: MIT
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/**
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* Invoke your custom commands.
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*
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* This package is also accessible with `window.__TAURI__.tauri` when `tauri.conf.json > build > withGlobalTauri` is set to true.
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* @module
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*/
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/** @ignore */
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declare global {
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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interface Window {
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__TAURI_IPC__: (message: any) => void
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ipc: {
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postMessage: (args: string) => void
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}
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}
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}
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/** @ignore */
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function uid(): number {
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return window.crypto.getRandomValues(new Uint32Array(1))[0]
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}
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/**
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* Transforms a callback function to a string identifier that can be passed to the backend.
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* The backend uses the identifier to `eval()` the callback.
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*
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* @return A unique identifier associated with the callback function.
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*/
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function transformCallback(
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callback?: (response: any) => void,
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once = false
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): number {
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const identifier = uid()
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const prop = `_${identifier}`
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Object.defineProperty(window, prop, {
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value: (result: any) => {
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if (once) {
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Reflect.deleteProperty(window, prop)
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}
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return callback?.(result)
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},
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writable: false,
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configurable: true
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})
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return identifier
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}
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/** Command arguments. */
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interface InvokeArgs {
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[key: string]: unknown
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}
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/**
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* Sends a message to the backend.
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*
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* @param cmd The command name.
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* @param args The optional arguments to pass to the command.
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* @return A promise resolving or rejecting to the backend response.
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*/
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async function invoke<T>(cmd: string, args: InvokeArgs = {}): Promise<T> {
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return new Promise((resolve, reject) => {
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const callback = transformCallback((e: T) => {
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resolve(e)
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Reflect.deleteProperty(window, error)
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}, true)
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const error = transformCallback((e) => {
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reject(e)
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Reflect.deleteProperty(window, callback)
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}, true)
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window.__TAURI_IPC__({
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cmd,
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callback,
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error,
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...args
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})
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})
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}
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/**
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* Convert a device file path to an URL that can be loaded by the webview.
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* Note that `asset:` and `https://asset.localhost` must be allowed on the `csp` value configured on `tauri.conf.json > tauri > security`.
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* Example CSP value: `"csp": "default-src 'self'; img-src 'self' asset: https://asset.localhost"`.
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*
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* Additionally, the `asset` must be allowlisted under `tauri.conf.json > tauri > allowlist > protocol`,
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* and its access scope must be defined on the `assetScope` array on the same `protocol` object.
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*
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* @param filePath the file path.
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*
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* @return the URL that can be used as source on the webview.
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*/
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function convertFileSrc(filePath: string): string {
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return navigator.userAgent.includes('Windows')
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? `https://asset.localhost/${filePath}`
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: `asset://${filePath}`
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}
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export type { InvokeArgs }
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export { transformCallback, invoke, convertFileSrc }
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