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feat: Expose the maximum hardware resolution through probeSupport() (#…
…6569) This makes it easier to debug hardware resolution issues through the support page, which can now show hardware resolution. To show the support page on Chromecast devices, use chromecast-webdriver-cli.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| /*! @license | ||
| * Shaka Player | ||
| * Copyright 2016 Google LLC | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
|
||
| /** | ||
| * @fileoverview Proxy cast platform methods across frames. Shared between the | ||
| * test environment and support.html. | ||
| */ | ||
|
|
||
| /** | ||
| * Patch Cast's cast.__platform__.canDisplayType to allow it to operate across | ||
| * frames and origins in our testing environment. | ||
| * | ||
| * The Cast runtime only exposes cast.__platform__ on the top window, not | ||
| * iframes embedded within it. However, both Chromecast WebDriver Server in | ||
| * our lab and the test runner Karma use iframes, and there are three different | ||
| * origins involved: WebDriver Server's receiver at github.io, Karma's | ||
| * top-level, and an inner frame of Karma that is raw HTML as text with no | ||
| * origin. | ||
| * | ||
| * With all of these complexities, the only way to access cast.__platform__ is | ||
| * asynchronously via postMessage. This means all callers of | ||
| * cast.__platform__.canDisplayType must use `await`, even though the | ||
| * underlying method is synchronous. If the caller is running in the top frame | ||
| * (as in a real receiver), `await` will do no harm. If the caller is running | ||
| * inside our tests in Karma, the `await` is critical to access __platform__ | ||
| * via this shim. | ||
| */ | ||
| function proxyCastCanDisplayType() { | ||
| if (!navigator.userAgent.includes('CrKey')) { | ||
| // Not Chromecast, do nothing. | ||
| return; | ||
| } | ||
|
|
||
| // Create the namespaces if needed. | ||
| if (!window.cast) { | ||
| window['cast'] = {}; | ||
| } | ||
| if (!cast.__platform__) { | ||
| cast['__platform__'] = {}; | ||
| } | ||
|
|
||
| if (cast.__platform__.canDisplayType) { | ||
| // Already exists, do nothing. | ||
| return; | ||
| } | ||
|
|
||
| // Create an async shim. Calls to canDisplayType will be translated into | ||
| // async messages to the top frame, which will then execute the method and | ||
| // post a message back with results (or an error). The resolve/reject | ||
| // functions for the shim's returned Promise will be stored temporarily in | ||
| // these maps and matched up by request ID. | ||
| /** @type {!Map<number, function(?)>} */ | ||
| const resolveMap = new Map(); | ||
| /** @type {!Map<number, function(?)>} */ | ||
| const rejectMap = new Map(); | ||
| /** @type {number} */ | ||
| let nextId = 0; | ||
|
|
||
| /** | ||
| * @typedef {{ | ||
| * id: number, | ||
| * type: string, | ||
| * result: *, | ||
| * }} | ||
| */ | ||
| let CastShimMessage; | ||
|
|
||
| // Listen for message events for results/errors from the top frame. | ||
| window.addEventListener('message', (event) => { | ||
| const data = /** @type {CastShimMessage} */(event['data']); | ||
| console.log('Received cross-frame message', data); | ||
|
|
||
| if (data.type == 'cast.__platform__:result') { | ||
| // Find the matching resolve function and resolve the promise for this | ||
| // request. | ||
| const resolve = resolveMap.get(data.id); | ||
| if (resolve) { | ||
| resolve(data.result); | ||
|
|
||
| // Clear both resolve and reject from the maps for this ID. | ||
| resolveMap.delete(data.id); | ||
| rejectMap.delete(data.id); | ||
| } | ||
| } else if (data.type == 'cast.__platform__:error') { | ||
| // Find the matching reject function and reject the promise for this | ||
| // request. | ||
| const reject = rejectMap.get(data.id); | ||
| if (reject) { | ||
| reject(data.result); | ||
|
|
||
| // Clear both resolve and reject from the maps for this ID. | ||
| resolveMap.delete(data.id); | ||
| rejectMap.delete(data.id); | ||
| } | ||
| } | ||
| }); | ||
|
|
||
| // Shim canDisplayType to proxy the request up to the top frame. | ||
| cast.__platform__.canDisplayType = /** @type {?} */(castCanDisplayTypeShim); | ||
|
|
||
| /** | ||
| * @param {string} type | ||
| * @return {!Promise<boolean>} | ||
| */ | ||
| function castCanDisplayTypeShim(type) { | ||
| return new Promise((resolve, reject) => { | ||
| // Craft a message for the top frame to execute this method for us. | ||
| const message = { | ||
| id: nextId++, | ||
| type: 'cast.__platform__', | ||
| command: 'canDisplayType', | ||
| args: Array.from(arguments), | ||
| }; | ||
|
|
||
| // Store the resolve and reject functions so we can act on results/errors | ||
| // later. | ||
| resolveMap.set(message.id, resolve); | ||
| rejectMap.set(message.id, reject); | ||
|
|
||
| // Reject after a 5s timeout. This can happen if we're running under an | ||
| // incompatible version of Chromecast WebDriver Server's receiver app. | ||
| setTimeout(() => { | ||
| reject(new Error('canDisplayType timeout!')); | ||
|
|
||
| // Clear both resolve and reject from the maps for this ID. | ||
| resolveMap.delete(message.id); | ||
| rejectMap.delete(message.id); | ||
| }, 5000); | ||
|
|
||
| // Send the message to the top frame. | ||
| console.log('Sending cross-frame message', message); | ||
| window.top.postMessage(message, '*'); | ||
| }); | ||
| } | ||
| } |
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