From a3854ced0f09ca25a9d15094dd9aa67cbe7546df Mon Sep 17 00:00:00 2001
From: Evert Prants <imsonotsleepy@gmail.com>
Date: Sun, 6 Dec 2020 18:16:11 +0200
Subject: [PATCH] calendar plugin

---
 calendar/plugin.json |   9 ++
 calendar/plugin.ts   | 277 +++++++++++++++++++++++++++++++++
 package-lock.json    | 357 +++++++++++++++++++++++++++++++++++++++++++
 package.json         |   1 +
 squeebot.repo.json   |   4 +
 5 files changed, 648 insertions(+)
 create mode 100644 calendar/plugin.json
 create mode 100644 calendar/plugin.ts

diff --git a/calendar/plugin.json b/calendar/plugin.json
new file mode 100644
index 0000000..a6bfd86
--- /dev/null
+++ b/calendar/plugin.json
@@ -0,0 +1,9 @@
+{
+  "main": "plugin.js",
+  "name": "calendar",
+  "description": "Plugin for iCalendar/VCS room events",
+  "version": "1.0.0",
+  "tags": ["commands", "utility", "calendar"],
+  "dependencies": ["simplecommands"],
+  "npmDependencies": ["node-ical@^0.12.3"]
+}
diff --git a/calendar/plugin.ts b/calendar/plugin.ts
new file mode 100644
index 0000000..0eede94
--- /dev/null
+++ b/calendar/plugin.ts
@@ -0,0 +1,277 @@
+import {
+  Plugin,
+  Configurable,
+  EventListener,
+  DependencyLoad
+} from '@squeebot/core/lib/plugin';
+
+import { async as ical } from 'node-ical';
+
+import { logger } from '@squeebot/core/lib/core';
+import { Formatter, IMessage } from '@squeebot/core/lib/types';
+import { fullIDMatcher, readableTime } from '@squeebot/core/lib/common';
+
+let calendarTimeout: NodeJS.Timeout;
+
+interface CalendarConfiguration {
+  name: string;
+  url: string;
+  timeFrame: number;
+  overrideDescription?: string;
+  rooms: string[];
+}
+
+interface Event {
+  id: string;
+  name: string;
+  start: number;
+  end: number;
+  description: string;
+  from: CalendarConfiguration;
+}
+
+const loaded: CalendarConfiguration[] = [];
+let memcache: Event[] = [];
+
+function nts(): number {
+  return Math.floor(Date.now() / 1000);
+}
+
+function eventsFor(msg: IMessage): Event[] {
+  return memcache.filter((ev: Event) => {
+    if (!msg.fullRoomID) {
+      return false;
+    }
+
+    if (!ev.from.rooms.length) {
+      return true;
+    }
+
+    let matchesOne = false;
+    for (const room of ev.from.rooms) {
+      if (fullIDMatcher(msg.fullRoomID, room)) {
+        matchesOne = true;
+      }
+    }
+
+    return matchesOne;
+  });
+}
+
+function sortStartTime(a: Event, b: Event): number {
+  return a.start - b.end;
+}
+
+function colorize(events: Event[], format: Formatter): string[] {
+  const colorized: string[] = [];
+
+  for (const event of events) {
+    let color = 'gold';
+
+    if (event.start <= nts() && event.end > nts()) {
+      color = 'green';
+    } else if (event.end < nts()) {
+      color = 'red';
+    }
+
+    colorized.push(format.color(color, event.name));
+  }
+
+  return colorized;
+}
+
+function tellEvent(eventData: Event, msg: IMessage, countdown = true): void {
+  if (!eventData) {
+    return;
+  }
+
+  const keys = [];
+  let startColor = 'gold';
+  let tstamp = '';
+
+  if (eventData.start > nts()) {
+    const timeLeftStamp = countdown ? 'in ' +
+      readableTime(eventData.start - nts()) : new Date(eventData.start * 1000);
+    tstamp = 'starts ' + timeLeftStamp + '.';
+  } else if (eventData.start <= nts() && eventData.end > nts()) {
+    const timeLeftStamp = countdown ? 'in ' +
+      readableTime(eventData.end - nts()) : new Date(eventData.end * 1000);
+    startColor = 'green';
+    tstamp = 'ends ' + timeLeftStamp + '.';
+  } else {
+    startColor = 'red';
+    tstamp = 'is over :(';
+  }
+
+  keys.push(['field', 'Event', { type: 'title', color: 'green' }]);
+  keys.push(['field', eventData.name, { color: startColor }]);
+  keys.push(['bold', tstamp]);
+  keys.push(['field', eventData.description || '', { type: 'content' }]);
+
+  msg.resolve(keys);
+}
+
+async function fetchCalendars(interval: number): Promise<void> {
+  clearTimeout(calendarTimeout);
+
+  memcache = [];
+  for (const cfg of loaded) {
+    let result;
+    let events = 0;
+    try {
+      result = await ical.fromURL(cfg.url);
+    } catch (e) {
+      logger.error('Calendar %s fetch failed:', cfg.name, e.stack);
+    }
+
+    for (const key in result) {
+      const data = result[key];
+      if (!data.type || data.type !== 'VEVENT') {
+        continue;
+      }
+
+      const start = Math.floor(new Date(data.start).getTime() / 1000);
+      const end = Math.floor(new Date(data.end).getTime() / 1000);
+
+      // Skip events that are over and start beyond the time frame
+      if (start > nts() + cfg.timeFrame || end < nts()) {
+        continue;
+      }
+
+      memcache.push({
+        id: key,
+        name: data.summary,
+        start,
+        end,
+        from: cfg,
+        description: data.description || '',
+      });
+
+      events++;
+    }
+
+    logger.log('[calendar] Fetched %d events from %s.', events, cfg.name);
+  }
+
+  calendarTimeout = setTimeout(() => {
+    fetchCalendars(interval).catch(
+      (e) => logger.error('[calendar] fetch error:', e.stack));
+  }, interval * 1000);
+}
+
+@Configurable({
+  calendars: [],
+  updateInterval: 1800,
+})
+class CalendarPlugin extends Plugin {
+  @EventListener('pluginUnload')
+  public unloadEventHandler(plugin: string | Plugin): void {
+    if (plugin === this.name || plugin === this) {
+      clearTimeout(calendarTimeout);
+      this.config.save().then(() =>
+        this.emit('pluginUnloaded', this));
+    }
+  }
+
+  @DependencyLoad('simplecommands')
+  addCalendarCommands(cmd: any): void {
+    const cmds = [
+      {
+        name: 'events',
+        plugin: this.name,
+        execute: async (msg: IMessage, spec: any, prefix: string, ...simplified: any[]): Promise<boolean> => {
+          if (simplified[0] && simplified[0] === 'refresh') {
+            await fetchCalendars(this.config.get('updateInterval', 1800));
+          }
+
+          let events = eventsFor(msg);
+          if (!events.length) {
+            msg.resolve('Events in %s: None currently scheduled.', msg.target?.name);
+            return true;
+          }
+
+          events = events.filter((ev: Event) =>
+            ev.start < nts() + ev.from.timeFrame && ev.end > nts());
+
+          if (!events.length) {
+            msg.resolve('Events in %s: None currently scheduled.', msg.target?.name);
+            return true;
+          }
+
+          events = events.sort(sortStartTime);
+
+          msg.resolve('Events in %s:', msg.target?.name,
+            colorize(events, msg.source.format).join(', '));
+          return true;
+        },
+        description: 'Show a list of upcoming and ongoing events in the current room',
+      },
+      {
+        name: 'event',
+        plugin: this.name,
+        execute: async (msg: IMessage, spec: any, prefix: string, ...simplified: any[]): Promise<boolean> => {
+          let evt = simplified[0];
+          let countdown = true;
+          let slice = 0;
+          if (evt && evt === '-d' || evt === 'get-date' || evt === 'get-time') {
+            countdown = false;
+            evt = simplified[1];
+            slice = 1;
+          }
+
+          if (!evt) {
+            msg.resolve('Please specify an event!');
+            return true;
+          }
+
+          const query = simplified.slice(slice).join(' ');
+          let events = eventsFor(msg);
+          if (!events.length) {
+            msg.resolve('There are no events in %s.', msg.target?.name);
+            return true;
+          }
+
+          events = events.filter((ev: Event) => {
+            if (ev.start > nts() + ev.from.timeFrame || ev.end < nts()) {
+              return false;
+            }
+
+            return ev.name.toLowerCase().match(query) != null;
+          });
+
+          if (!events.length) {
+            msg.resolve('No events match "%s".', query);
+            return true;
+          } else if (events.length > 1) {
+            msg.resolve('Multiple events match "%s":', query);
+            return true;
+          }
+
+          tellEvent(events[0], msg, countdown);
+          return true;
+        },
+        usage: '<event>',
+        description: 'Show details of an event',
+      }
+    ];
+    cmd.registerCommand(cmds);
+  }
+
+  loadConfig(): void {
+    for (const cfg of this.config.get('calendars', [])) {
+      if (!cfg.name || !cfg.url) {
+        logger.error('[%s] Invalid calendar configuration.', this.name);
+        continue;
+      }
+      loaded.push(cfg);
+    }
+  }
+
+  initialize(): void {
+    this.loadConfig();
+    fetchCalendars(this.config.get('updateInterval', 1800)).catch(
+      (e) => logger.error('[%s] fetch error:', this.name, e.stack));
+  }
+}
+
+module.exports = CalendarPlugin;
diff --git a/package-lock.json b/package-lock.json
index 5349e15..a0cbd40 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -531,6 +531,17 @@
         "@types/node": "*"
       }
     },
+    "ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
     "amdefine": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
@@ -541,6 +552,34 @@
       "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
       "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
     },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
+    },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
+    },
+    "aws4": {
+      "version": "1.11.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.11.0.tgz",
+      "integrity": "sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA=="
+    },
     "barse": {
       "version": "0.4.3",
       "resolved": "https://registry.npmjs.org/barse/-/barse-0.4.3.tgz",
@@ -567,6 +606,14 @@
         }
       }
     },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "requires": {
+        "tweetnacl": "^0.14.3"
+      }
+    },
     "boolbase": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz",
@@ -591,6 +638,11 @@
         "responselike": "^2.0.0"
       }
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
+    },
     "cheerio": {
       "version": "1.0.0-rc.3",
       "resolved": "https://registry.npmjs.org/cheerio/-/cheerio-1.0.0-rc.3.tgz",
@@ -612,6 +664,14 @@
         "mimic-response": "^1.0.0"
       }
     },
+    "combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "requires": {
+        "delayed-stream": "~1.0.0"
+      }
+    },
     "commander": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
@@ -664,6 +724,14 @@
       "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.3.tgz",
       "integrity": "sha512-a+EPoD+uZiNfh+5fxw2nO9QwFa6nJe2Or35fGY6Ipw1R3R4AGz1d1TEZrCegvw2YTmZ0jXirGYlzxxpYSHwpEg=="
     },
+    "dashdash": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
+      "integrity": "sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=",
+      "requires": {
+        "assert-plus": "^1.0.0"
+      }
+    },
     "decimal.js": {
       "version": "10.2.1",
       "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.2.1.tgz",
@@ -689,6 +757,11 @@
       "resolved": "https://registry.npmjs.org/defer-to-connect/-/defer-to-connect-2.0.0.tgz",
       "integrity": "sha512-bYL2d05vOSf1JEZNx5vSAtPuBMkX8K9EUutg7zlKvTqKXHt7RhWJFbmd7qakVuf13i+IkGmp6FwSsONOf6VYIg=="
     },
+    "delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
+    },
     "dom-serializer": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.1.1.tgz",
@@ -720,6 +793,15 @@
         "domelementtype": "1"
       }
     },
+    "ecc-jsbn": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
+      "integrity": "sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=",
+      "requires": {
+        "jsbn": "~0.1.0",
+        "safer-buffer": "^2.1.0"
+      }
+    },
     "end-of-stream": {
       "version": "1.4.4",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.4.tgz",
@@ -743,6 +825,41 @@
       "resolved": "https://registry.npmjs.org/event-to-promise/-/event-to-promise-0.7.0.tgz",
       "integrity": "sha1-ywffzUGNoiIdkPd+q3E7wjXiCQ8="
     },
+    "extend": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
+      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g=="
+    },
+    "extsprintf": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
+      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU="
+    },
+    "fast-deep-equal": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
+      "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="
+    },
+    "fast-json-stable-stringify": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
+      "integrity": "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw=="
+    },
+    "forever-agent": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
+      "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE="
+    },
+    "form-data": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.3.tgz",
+      "integrity": "sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==",
+      "requires": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.6",
+        "mime-types": "^2.1.12"
+      }
+    },
     "fraction.js": {
       "version": "4.0.12",
       "resolved": "https://registry.npmjs.org/fraction.js/-/fraction.js-4.0.12.tgz",
@@ -785,6 +902,14 @@
         "pump": "^3.0.0"
       }
     },
+    "getpass": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz",
+      "integrity": "sha1-Xv+OPmhNVprkyysSgmBOi6YhSfo=",
+      "requires": {
+        "assert-plus": "^1.0.0"
+      }
+    },
     "got": {
       "version": "11.8.0",
       "resolved": "https://registry.npmjs.org/got/-/got-11.8.0.tgz",
@@ -808,6 +933,20 @@
       "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
       "integrity": "sha1-TK+tdrxi8C+gObL5Tpo906ORpyU="
     },
+    "har-schema": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
+      "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI="
+    },
+    "har-validator": {
+      "version": "5.1.5",
+      "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.1.5.tgz",
+      "integrity": "sha512-nmT2T0lljbxdQZfspsno9hgrG3Uir6Ks5afism62poxqBM6sDnMEuPmzTq8XN0OEwqKLLdh1jQI3qyE66Nzb3w==",
+      "requires": {
+        "ajv": "^6.12.3",
+        "har-schema": "^2.0.0"
+      }
+    },
     "htmlparser2": {
       "version": "3.10.1",
       "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.10.1.tgz",
@@ -826,6 +965,16 @@
       "resolved": "https://registry.npmjs.org/http-cache-semantics/-/http-cache-semantics-4.1.0.tgz",
       "integrity": "sha512-carPklcUh7ROWRK7Cv27RPtdhYhUsela/ue5/jKzjegVvXDqM2ILE9Q2BGn9JZJh1g87cp56su/FgQSzcWS8cQ=="
     },
+    "http-signature": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
+      "integrity": "sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=",
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "jsprim": "^1.2.2",
+        "sshpk": "^1.7.0"
+      }
+    },
     "http2-wrapper": {
       "version": "1.0.0-beta.5.2",
       "resolved": "https://registry.npmjs.org/http2-wrapper/-/http2-wrapper-1.0.0-beta.5.2.tgz",
@@ -848,21 +997,62 @@
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
       "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
     },
+    "is-typedarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz",
+      "integrity": "sha1-5HnICFjfDBsR3dppQPlgEfzaSpo="
+    },
     "isarray": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
       "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
     },
+    "isstream": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
+      "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo="
+    },
     "javascript-natural-sort": {
       "version": "0.7.1",
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@@ -1055,6 +1251,19 @@
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+      "resolved": "https://registry.npmjs.org/moment-timezone/-/moment-timezone-0.5.32.tgz",
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+        "moment": ">= 2.9.0"
+      }
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+    "node-ical": {
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+      "resolved": "https://registry.npmjs.org/node-ical/-/node-ical-0.12.3.tgz",
+      "integrity": "sha512-MCr71z5mUcF7LuC3iIPKMKcaQ4Mr5cft0Uh00BBnkOrsm6vdS2xTUOKy1vhaYZ1V711LJmSAwQakxBXxLlHY3g==",
+      "requires": {
+        "moment-timezone": "^0.5.31",
+        "request": "^2.88.2",
+        "rrule": "2.6.6",
+        "uuid": "^8.3.1"
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@@ -1083,6 +1311,11 @@
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+    "oauth-sign": {
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+      "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.9.0.tgz",
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@@ -1104,11 +1337,21 @@
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+      "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
+      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns="
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+      "resolved": "https://registry.npmjs.org/psl/-/psl-1.8.0.tgz",
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+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
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+    },
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@@ -1138,6 +1386,40 @@
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       }
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+    "request": {
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+      "resolved": "https://registry.npmjs.org/request/-/request-2.88.2.tgz",
+      "integrity": "sha512-MsvtOrfG9ZcrOwAW+Qi+F6HbD0CWXEh9ou77uOb7FM2WPhwT7smM833PzanhJLsgXjN89Ir6V2PczXNnMpwKhw==",
+      "requires": {
+        "aws-sign2": "~0.7.0",
+        "aws4": "^1.8.0",
+        "caseless": "~0.12.0",
+        "combined-stream": "~1.0.6",
+        "extend": "~3.0.2",
+        "forever-agent": "~0.6.1",
+        "form-data": "~2.3.2",
+        "har-validator": "~5.1.3",
+        "http-signature": "~1.2.0",
+        "is-typedarray": "~1.0.0",
+        "isstream": "~0.1.2",
+        "json-stringify-safe": "~5.0.1",
+        "mime-types": "~2.1.19",
+        "oauth-sign": "~0.9.0",
+        "performance-now": "^2.1.0",
+        "qs": "~6.5.2",
+        "safe-buffer": "^5.1.2",
+        "tough-cookie": "~2.5.0",
+        "tunnel-agent": "^0.6.0",
+        "uuid": "^3.3.2"
+      },
+      "dependencies": {
+        "uuid": {
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+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+          "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
+        }
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       "resolved": "https://registry.npmjs.org/resolve-alpn/-/resolve-alpn-1.0.0.tgz",
@@ -1151,6 +1433,15 @@
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+    "rrule": {
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+      "resolved": "https://registry.npmjs.org/rrule/-/rrule-2.6.6.tgz",
+      "integrity": "sha512-h6tb/hRo9SNv8xKjcvsEfdmhXvElMXsU3Yz0KmqMehUqxP6a4Qjmth2EuL1FsjdawADjajLS0eBbWfsZzn3SIw==",
+      "requires": {
+        "luxon": "^1.21.3",
+        "tslib": "^1.10.0"
+      }
+    },
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@@ -1171,6 +1462,22 @@
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+    "sshpk": {
+      "version": "1.16.1",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
+      "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
+      "requires": {
+        "asn1": "~0.2.3",
+        "assert-plus": "^1.0.0",
+        "bcrypt-pbkdf": "^1.0.0",
+        "dashdash": "^1.12.0",
+        "ecc-jsbn": "~0.1.1",
+        "getpass": "^0.1.1",
+        "jsbn": "~0.1.0",
+        "safer-buffer": "^2.0.2",
+        "tweetnacl": "~0.14.0"
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     "string-to-stream": {
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       "resolved": "https://registry.npmjs.org/string-to-stream/-/string-to-stream-1.1.1.tgz",
@@ -1227,6 +1534,33 @@
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+    "tough-cookie": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
+      "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
+      "requires": {
+        "psl": "^1.1.28",
+        "punycode": "^2.1.1"
+      }
+    },
+    "tslib": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+      "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
+    },
     "typed-function": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/typed-function/-/typed-function-2.0.0.tgz",
@@ -1237,16 +1571,39 @@
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     },
+    "uri-js": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz",
+      "integrity": "sha512-B0yRTzYdUCCn9n+F4+Gh4yIDtMQcaJsmYBDsTSG8g/OejKBodLQ2IHfN3bM7jUsRXndopT7OIXWdYqc1fjmV6g==",
+      "requires": {
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+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
+    "uuid": {
+      "version": "8.3.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.1.tgz",
+      "integrity": "sha512-FOmRr+FmWEIG8uhZv6C2bTgEVXsHk08kE7mPlrBbEe+c3r9pjceVPgupIfNIhc4yx55H69OXANrUaSuu9eInKg=="
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       "resolved": "https://registry.npmjs.org/varint/-/varint-5.0.2.tgz",
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+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
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diff --git a/package.json b/package.json
index 6f1962e..735a71d 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
     "convert-units": "^2.3.4",
     "gamedig": "^2.0.23",
     "mathjs": "^8.0.1",
+    "node-ical": "^0.12.3",
     "typescript": "^4.1.2"
   },
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diff --git a/squeebot.repo.json b/squeebot.repo.json
index 4e79ac0..7df537c 100644
--- a/squeebot.repo.json
+++ b/squeebot.repo.json
@@ -1,6 +1,10 @@
 {
   "name": "plugins-evert",
   "plugins": [
+    {
+      "name": "calendar",
+      "version": "1.0.0"
+    },
     {
       "name": "debug",
       "version": "1.0.0"