feat: add nextcloud integration (#2501)

packages/integrations/src/nextcloud/nextcloud.integration.ts

@@ -0,0 +1,97 @@
+import dayjs from "dayjs";
+import objectSupport from "dayjs/plugin/objectSupport";
+import utc from "dayjs/plugin/utc";
+import * as ical from "node-ical";
+import { DAVClient } from "tsdav";
+
+import { logger } from "@homarr/log";
+
+import { Integration } from "../base/integration";
+import type { CalendarEvent } from "../calendar-types";
+
+dayjs.extend(utc);
+dayjs.extend(objectSupport);
+
+export class NextcloudIntegration extends Integration {
+  public async testConnectionAsync(): Promise<void> {
+    const client = this.createCalendarClient();
+    await client.login();
+  }
+
+  public async getCalendarEventsAsync(start: Date, end: Date): Promise<CalendarEvent[]> {
+    const client = this.createCalendarClient();
+    await client.login();
+
+    const calendars = await client.fetchCalendars();
+    // Parameters must be in ISO-8601, See https://tsdav.vercel.app/docs/caldav/fetchCalendarObjects#arguments
+    const calendarEvents = (
+      await Promise.all(
+        calendars.map(
+          async (calendar) =>
+            await client.fetchCalendarObjects({
+              calendar,
+              timeRange: { start: start.toISOString(), end: end.toISOString() },
+            }),
+        ),
+      )
+    ).flat();
+
+    return calendarEvents.map((event): CalendarEvent => {
+      // @ts-expect-error the typescript definitions for this package are wrong
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-call,@typescript-eslint/no-unsafe-member-access
+      const icalData = ical.default.parseICS(event.data) as ical.CalendarResponse;
+      const veventObject = Object.values(icalData).find((data) => data.type === "VEVENT");
+
+      if (!veventObject) {
+        throw new Error(`Invalid event data object: ${JSON.stringify(event.data)}. Unable to process the calendar.`);
+      }
+
+      logger.debug(`Converting VEVENT event to ${event.etag} from Nextcloud: ${JSON.stringify(veventObject)}`);
+
+      const date = dayjs.utc({
+        days: veventObject.start.getDay(),
+        month: veventObject.start.getMonth(),
+        year: veventObject.start.getFullYear(),
+        hours: veventObject.start.getHours(),
+        minutes: veventObject.start.getMinutes(),
+        seconds: veventObject.start.getSeconds(),
+      });
+
+      const eventUrlWithoutHost = new URL(event.url).pathname;
+      const dateInMillis = veventObject.start.valueOf();
+
+      const url = this.url(
+        `/apps/calendar/timeGridWeek/now/edit/sidebar/${Buffer.from(eventUrlWithoutHost).toString("base64url")}/${dateInMillis / 1000}`,
+      );
+
+      return {
+        name: veventObject.summary,
+        date: date.toDate(),
+        subName: "",
+        description: veventObject.description,
+        links: [
+          {
+            href: url.toString(),
+            name: "Nextcloud",
+            logo: "/images/apps/nextcloud.svg",
+            color: undefined,
+            notificationColor: "#ff8600",
+            isDark: true,
+          },
+        ],
+      };
+    });
+  }
+
+  private createCalendarClient() {
+    return new DAVClient({
+      serverUrl: this.integration.url,
+      credentials: {
+        username: this.getSecretValue("username"),
+        password: this.getSecretValue("password"),
+      },
+      authMethod: "Basic",
+      defaultAccountType: "caldav",
+    });
+  }
+}