From 66cf03405c5826827d82cdacdf83e5e6b0a6d582 Mon Sep 17 00:00:00 2001
From: Anders Evenrud <andersevenrud@gmail.com>
Date: Mon, 17 Aug 2020 19:42:23 +0200
Subject: [PATCH] Added client side directory VFS watch (#57)

---
 __tests__/utils/vfs.js |  2 ++
 src/config.js          |  2 +-
 src/filesystem.js      | 13 ++++++++++---
 src/utils/vfs.js       | 43 +++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 55 insertions(+), 5 deletions(-)

diff --git a/__tests__/utils/vfs.js b/__tests__/utils/vfs.js
index 05d566b0..b964afd1 100644
--- a/__tests__/utils/vfs.js
+++ b/__tests__/utils/vfs.js
@@ -232,6 +232,8 @@ describe('utils.vfs#basename', () => {
 describe('utils.vfs#pathname', () => {
   test('Should resolve', () => {
     expect(vfs.pathname('home:/foo/bar')).toBe('home:/foo');
+    expect(vfs.pathname('home:/foo')).toBe('home:/');
+    expect(vfs.pathname('home:/')).toBe('home:/');
   });
 });
 
diff --git a/src/config.js b/src/config.js
index 50bc2946..3c0d6164 100644
--- a/src/config.js
+++ b/src/config.js
@@ -236,7 +236,7 @@ export const defaultConfiguration = {
   },
 
   vfs: {
-    watch: false,
+    watch: true,
     defaultPath: 'home:/',
     defaultAdapter: 'system',
     adapters: {},
diff --git a/src/filesystem.js b/src/filesystem.js
index 605d75d6..8137bb77 100644
--- a/src/filesystem.js
+++ b/src/filesystem.js
@@ -30,7 +30,7 @@
 
 import * as VFS from './vfs';
 import {EventEmitter} from '@osjs/event-emitter';
-import {parseMontpointPrefix, filterMountByGroups} from './utils/vfs';
+import {parseMontpointPrefix, filterMountByGroups, createWatchEvents} from './utils/vfs';
 import defaultAdapter from './adapters/vfs/null';
 import systemAdapter from './adapters/vfs/system';
 import appsAdapter from './adapters/vfs/apps';
@@ -233,7 +233,14 @@ export default class Filesystem extends EventEmitter {
   _request(method, ...args) {
     const ev = `osjs/vfs:${method}`;
 
-    const done = () => this.core.emit(`${ev}:done`, ...args);
+    const done = (error) => {
+      this.core.emit(`${ev}:done`, ...args);
+
+      if (!error && this.core.config('vfs.watch')) {
+        const eva = createWatchEvents(method, args);
+        eva.forEach(([e, a]) => this.core.emit(e, a));
+      }
+    };
 
     this.core.emit(ev, ...args);
 
@@ -243,7 +250,7 @@ export default class Filesystem extends EventEmitter {
         return result;
       })
       .catch(error => {
-        done();
+        done(error);
         throw error;
       });
   }
diff --git a/src/utils/vfs.js b/src/utils/vfs.js
index a20c76d1..cca05cf4 100644
--- a/src/utils/vfs.js
+++ b/src/utils/vfs.js
@@ -310,7 +310,12 @@ export const basename = path => path.split('/').reverse()[0];
  */
 export const pathname = path => {
   const split = path.split('/');
-  split.splice(split.length - 1, 1);
+  if (split.length === 2) {
+    split[1] = '';
+  } else {
+    split.splice(split.length - 1, 1);
+  }
+
   return split.join('/');
 };
 
@@ -341,3 +346,39 @@ export const filterMountByGroups = userGroups => (mountGroups, strict = true) =>
     ? mountGroups[strict ? 'every' : 'some'](g => userGroups.indexOf(g) !== -1)
     : true;
 
+
+/**
+ * Creates a list of VFS events to simulate server-side
+ * file watching
+ * @return {object[]}
+ */
+export const createWatchEvents = (method, args) => {
+  const events = [];
+  const options = args[args.length - 1] || {};
+
+  const movement = ['move', 'rename', 'copy'].indexOf(method) !== -1;
+  const invalid = ['readdir', 'download', 'url', 'exists', 'readfile', 'search', 'stat'].indexOf(method) !== -1;
+  const path = i => typeof i === 'string' ? i : i.path;
+
+  if (!invalid) {
+    const obj = {
+      method,
+      source: path(args[0]),
+      pid: options.pid
+    };
+
+    events.push(['osjs/vfs:directoryChanged', {
+      ...obj,
+      path: pathname(path(args[0])),
+    }]);
+
+    if (movement) {
+      events.push(['osjs/vfs:directoryChanged', {
+        ...obj,
+        path: pathname(path(args[1]))
+      }]);
+    }
+  }
+
+  return events;
+};