Adding ooo chat app as a solution.

Author: chanelgreco

solutions/ooo-chat-app/Code.js

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+/**
+ * Responds to an ADDED_TO_SPACE event in Chat.
+ * @param {object} event the event object from Chat
+ * @return {object} JSON-formatted response
+ * @see https://developers.google.com/hangouts/chat/reference/message-formats/events
+ */
+ function onAddToSpace(event) {
+    let message = 'Thank you for adding me to ';
+    if (event.space.type === 'DM') {
+      message += 'a DM, ' + event.user.displayName + '!';
+    } else {
+      message += event.space.displayName;
+    }
+    return { text: message };
+  }
+  
+  /**
+   * Responds to a REMOVED_FROM_SPACE event in Chat.
+   * @param {object} event the event object from Chat
+   * @param {object} event the event object from Chat
+   * @see https://developers.google.com/hangouts/chat/reference/message-formats/events
+   */
+  function onRemoveFromSpace(event) {
+    console.log('App removed from ', event.space.name);
+  }
+  
+  
+  /**
+   * Responds to a MESSAGE event triggered in Chat.
+   * @param {object} event the event object from Chat
+   * @return {function} call the respective function
+   */
+  function onMessage(event) {
+    const message = event.message;
+  
+    if (message.slashCommand) {
+      switch (message.slashCommand.commandId) {
+        case 1: // Help command
+          return createHelpCard();
+        case 2: // Block out day command
+          return blockDayOut();
+        case 3: // Cancel all meetings command
+          return cancelAllMeetings();
+        case 4: // Set auto reply command
+          return setAutoReply();
+      }
+    }
+  }
+  
+  function createHelpCard() {
+    return {
+      "cardsV2": [
+        {
+          "cardId": "2",
+          "card": {
+            "sections": [
+              {
+                "header": "",
+                "widgets": [
+                  {
+                    "decoratedText": {
+                      "topLabel": "",
+                      "text": "Hi! 👋 I'm here to help you with your out of office tasks.<br><br>Here's a list of commands I understand.",
+                      "wrapText": true
+                    }
+                  }
+                ]
+              },
+              {
+                "widgets": [
+                  {
+                    "decoratedText": {
+                      "topLabel": "",
+                      "text": "<b>/blockDayOut</b>: I will block out your calendar for you.",
+                      "wrapText": true
+                    }
+                  },
+                  {
+                    "decoratedText": {
+                      "topLabel": "",
+                      "text": "<b>/cancelAllMeetings</b>: I will cancel all your meetings for the day.",
+                      "wrapText": true
+                    }
+                  },
+                  {
+                    "decoratedText": {
+                      "topLabel": "",
+                      "text": "<b>/setAutoReply</b>: Set an out of office auto reply in Gmail.",
+                      "wrapText": true
+                    }
+                  }
+                ]
+              }
+            ],
+            "header": {
+              "title": "OOO app",
+              "subtitle": "Helping you manage your OOO",
+              "imageUrl": "https://goo.gle/3SfMkjb",
+              "imageType": "SQUARE"
+            }
+          }
+        }
+      ]
+    }
+  }
+  
+  /**
+   * Adds an all day event to the users Google Calendar.
+   * @return {object} JSON-formatted response
+   */
+  function blockDayOut() {
+    blockOutCalendar();
+    return createResponseCard('Your calendar has been blocked out for you.')
+  }
+  
+  /**
+   * Cancels all of the users meeting for the current day.
+   * @return {object} JSON-formatted response
+   */
+  function cancelAllMeetings() {
+    cancelMeetings();
+    return createResponseCard('All your meetings have been canceled.')
+  }
+  
+  /**
+   * Sets an out of office auto reply in the users Gmail account.
+   * @return {object} JSON-formatted response
+   */
+  function setAutoReply() {
+    turnOnAutoResponder();
+    return createResponseCard('The out of office auto reply has been turned on.')
+  }
+  
+  
+  const ONE_DAY_MILLIS = 24 * 60 * 60 * 1000;
+  
+  /**
+   * Places an all-day meeting on the user's Calendar.
+   */
+  function blockOutCalendar() {
+    CalendarApp.createAllDayEvent('I am out of office today', new Date(), new Date(Date.now() + ONE_DAY_MILLIS));
+  }
+  
+  /**
+   * Declines all meetings for the day.
+   */
+  
+  function cancelMeetings() {
+    const events = CalendarApp.getEventsForDay(new Date());
+  
+    events.forEach(function(event) {
+      if (event.getGuestList().length > 0) {
+        event.setMyStatus(CalendarApp.GuestStatus.NO);
+      }
+    });
+  }
+  
+  /**
+   * Turns on the user's vacation response for today in Gmail.
+   */
+  function turnOnAutoResponder() {
+    const currentTime = (new Date()).getTime();
+    Gmail.Users.Settings.updateVacation({
+      enableAutoReply: true,
+      responseSubject: 'I am out of the office today',
+      responseBodyHtml: 'I am out of the office today; will be back on the next business day.<br><br><i>Created by OOO Chat app!</i>',
+      restrictToContacts: true,
+      restrictToDomain: true,
+      startTime: currentTime,
+      endTime: currentTime + ONE_DAY_MILLIS
+    }, 'me');
+  }
+  
+  function createResponseCard(responseText) {
+    return {
+      "cardsV2": [
+        {
+          "cardId": "1",
+          "card": {
+            "sections": [
+              {
+                "widgets": [
+                  {
+                    "decoratedText": {
+                      "topLabel": "",
+                      "text": responseText,
+                      "startIcon": {
+                        "knownIcon": "NONE",
+                        "altText": "Task done",
+                        "iconUrl": "https://fonts.gstatic.com/s/i/short-term/web/system/1x/task_alt_gm_grey_48dp.png"
+                      },
+                      "wrapText": true
+                    }
+                  }
+                ]
+              }
+            ],
+            "header": {
+              "title": "OOO app",
+              "subtitle": "Helping you manage your OOO",
+              "imageUrl": "https://goo.gle/3SfMkjb",
+              "imageType": "CIRCLE"
+            }
+          }
+        }
+      ]
+    }
+  }
+  
+  

solutions/ooo-chat-app/README.md

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+Sample code for a custom Google Chat app that manages your out of office tasks.
+
+Learn more about Chat apps: https://developers.google.com/chat

solutions/ooo-chat-app/appsscript.json

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+{
+    "timeZone": "Europe/Madrid",
+    "exceptionLogging": "STACKDRIVER",
+    "runtimeVersion": "V8",
+    "dependencies": {
+      "enabledAdvancedServices": [
+        {
+          "userSymbol": "Gmail",
+          "version": "v1",
+          "serviceId": "gmail"
+        }
+      ]
+    },
+    "chat": {}
+  }