Update auto-logout to recognize idle time in background (#6593)

* Fix wording of autoLogoutTimeLimitDescription

* AppStateController and update auto-logout functionality

1 files changed, 73 insertions, 0 deletions

diff --git a/app/scripts/controllers/app-state.js b/app/scripts/controllers/app-state.js
new file mode 100644
index 000000000..9533fd458
--- /dev/null
+++ b/app/scripts/controllers/app-state.js
@@ -0,0 +1,73 @@
+const ObservableStore = require('obs-store')
+const extend = require('xtend')
+
+class AppStateController {
+  /**
+   * @constructor
+   * @param opts
+   */
+  constructor (opts = {}) {
+    const {initState, onInactiveTimeout, preferencesStore} = opts
+    const {preferences} = preferencesStore.getState()
+
+    this.onInactiveTimeout = onInactiveTimeout || (() => {})
+    this.store = new ObservableStore(extend({
+      timeoutMinutes: 0,
+    }, initState))
+    this.timer = null
+
+    preferencesStore.subscribe(state => {
+      this._setInactiveTimeout(state.preferences.autoLogoutTimeLimit)
+    })
+
+    this._setInactiveTimeout(preferences.autoLogoutTimeLimit)
+  }
+
+  /**
+   * Sets the last active time to the current time
+   * @return {void}
+   */
+  setLastActiveTime () {
+    this._resetTimer()
+  }
+
+  /**
+   * Sets the inactive timeout for the app
+   * @param {number} timeoutMinutes the inactive timeout in minutes
+   * @return {void}
+   * @private
+   */
+  _setInactiveTimeout (timeoutMinutes) {
+    this.store.putState({
+      timeoutMinutes,
+    })
+
+    this._resetTimer()
+  }
+
+  /**
+   * Resets the internal inactive timer
+   *
+   * If the {@code timeoutMinutes} state is falsy (i.e., zero) then a new
+   * timer will not be created.
+   *
+   * @return {void}
+   * @private
+   */
+  _resetTimer () {
+    const {timeoutMinutes} = this.store.getState()
+
+    if (this.timer) {
+      clearTimeout(this.timer)
+    }
+
+    if (!timeoutMinutes) {
+      return
+    }
+
+    this.timer = setTimeout(() => this.onInactiveTimeout(), timeoutMinutes * 60 * 1000)
+  }
+}
+
+module.exports = AppStateController
+