Support using a Widevine-enabled Electron for DRM playback (fix #435) (PR #1073)

docs/api.md

@@ -16,6 +16,7 @@
     - [[app-version]](#app-version)
     - [[build-version]](#build-version)
     - [[electron-version]](#electron-version)
+    - [[widevine]](#widevine)
     - [[no-overwrite]](#no-overwrite)
     - [[conceal]](#conceal)
     - [[icon]](#icon)
@@ -171,6 +172,14 @@ The build version of the application. Maps to the `FileVersion` metadata propert
 
 Electron version without the `v`, see https://github.com/atom/electron/releases.
 
+#### [widevine]
+
+```
+--widevine
+```
+
+Use a Widevine-enabled version of Electron for DRM playback, see https://github.com/castlabs/electron-releases.
+
 #### [no-overwrite]
 
 ```

src/cli.ts

@@ -118,6 +118,10 @@ if (require.main === module) {
       '-e, --electron-version <value>',
       "electron version to package, without the 'v', see https://github.com/electron/electron/releases",
     )
+    .option(
+      '--widevine',
+      "use a Widevine-enabled version of Electron for DRM playback (use at your own risk, it's unofficial, provided by CastLabs)",
+    )
     .option(
       '--no-overwrite',
       'do not override output directory if it already exists; defaults to false',

src/helpers/helpers.ts

@@ -39,7 +39,7 @@ export function getTempDir(prefix: string, mode?: number): string {
 export async function copyFileOrDir(
   sourceFileOrDir: string,
   dest: string,
-): Promise<any> {
+): Promise<void> {
   return new Promise((resolve, reject) => {
     ncp(sourceFileOrDir, dest, (error: any) => {
       if (error) {

src/options/optionsMain.ts

@@ -1,5 +1,6 @@
 import * as fs from 'fs';
 
+import axios from 'axios';
 import * as log from 'loglevel';
 
 // package.json is `require`d to let tsc strip the `src` folder by determining
@@ -130,6 +131,26 @@ export async function getOptions(rawOptions: any): Promise<AppOptions> {
     }
   }
 
+  if (rawOptions.widevine) {
+    const widevineElectronVersion = `${options.packager.electronVersion}-wvvmp`;
+    try {
+      await axios.get(
+        `https://github.com/castlabs/electron-releases/releases/tag/v${widevineElectronVersion}`,
+      );
+    } catch (error) {
+      throw `\nERROR: castLabs Electron version "${widevineElectronVersion}" does not exist. \nVerify versions at https://github.com/castlabs/electron-releases/releases. \nAborting.`;
+    }
+
+    options.packager.electronVersion = widevineElectronVersion;
+    process.env.ELECTRON_MIRROR =
+      'https://github.com/castlabs/electron-releases/releases/download/';
+    log.warn(
+      `\nATTENTION: Using the **unofficial** Electron from castLabs`,
+      "\nIt implements Google's Widevine Content Decryption Module (CDM) for DRM-enabled playback.",
+      `\nSimply abort & re-run without passing the widevine flag to default to ${DEFAULT_ELECTRON_VERSION}`,
+    );
+  }
+
   if (options.nativefier.flashPluginDir) {
     options.nativefier.insecure = true;
   }