Import File implementation

Summary: Implementation was missing for the browser. This provides a default implementation.

Reviewed By: aigoncharov

Differential Revision: D48311198

fbshipit-source-id: fd067600f571234e0fbccfb90853b62f175ff8fb

desktop/flipper-server-core/src/FlipperServerImpl.tsx

@@ -521,8 +521,11 @@ export class FlipperServerImpl implements FlipperServer {
       this.pluginManager.downloadPlugin(details),
     'plugins-get-updatable-plugins': (query) =>
       this.pluginManager.getUpdatablePlugins(query),
-    'plugins-install-from-file': (path) =>
-      this.pluginManager.installPluginFromFile(path),
+    'plugins-install-from-content': (contents) => {
+      const bytes = Base64.toUint8Array(contents);
+      const buffer = Buffer.from(bytes);
+      return this.pluginManager.installPluginFromFileOrBuffer(buffer);
+    },
     'plugins-install-from-marketplace': (name: string) =>
       this.pluginManager.installPluginForMarketplace(name),
     'plugins-install-from-npm': (name) =>

desktop/flipper-server-core/src/plugins/PluginManager.tsx

@@ -28,7 +28,7 @@ import {
   getInstalledPlugins,
   getPluginVersionInstallationDir,
   getPluginDirNameFromPackageName,
-  installPluginFromFile,
+  installPluginFromFileOrBuffer,
   removePlugins,
   getUpdatablePlugins,
   getInstalledPlugin,
@@ -71,7 +71,7 @@ export class PluginManager {
   removePlugins = removePlugins;
   getUpdatablePlugins = getUpdatablePlugins;
   getInstalledPlugin = getInstalledPlugin;
-  installPluginFromFile = installPluginFromFile;
+  installPluginFromFileOrBuffer = installPluginFromFileOrBuffer;
   installPluginFromNpm = installPluginFromNpm;
 
   async loadSource(path: string): Promise<PluginSource> {
@@ -186,7 +186,7 @@ export class PluginManager {
         await new Promise((resolve, reject) =>
           writeStream.once('finish', resolve).once('error', reject),
         );
-        return await installPluginFromFile(tmpFile);
+        return await installPluginFromFileOrBuffer(tmpFile);
       }
     } catch (error) {
       console.warn(