Implement CALDAV for nextcloud

server/routes/calendar.js

@@ -172,7 +172,7 @@ router.get('/events/:year/:month', async (req, res) => {
       res.json(events);
     }
   } catch (error) {
-    console.error('Error retrieving calendar events:', error);
+    console.error('Error retrieving calendar events:', error.message);
     res.status(500).json({ error: 'Failed to retrieve calendar events' });
   }
 });
@@ -208,7 +208,7 @@ router.post('/events', async (req, res) => {
     const event = await CalendarService.createEvent(userConfig, date, text);
     res.status(201).json(event);
   } catch (error) {
-    console.error('Error creating calendar event:', error);
+    console.error('Error creating calendar event:', error.message);
     res.status(500).json({ error: 'Failed to create calendar event' });
   }
 });

server/services/CalendarService.js

@@ -6,11 +6,6 @@ const http = require('http');
 const { URL } = require('url');
 
 class CalendarService {
-  constructor() {
-    this.events = new Map(); // In-memory storage for demo purposes
-    // TODO: Replace with actual CalDAV operations when library is available
-  }
-
   /**
    * Create a calendar event
    * @param {Object} userConfig - Nextcloud user configuration
@@ -20,33 +15,40 @@ class CalendarService {
    */
   async createEvent(userConfig, date, text) {
     try {
-      // TODO: Implement actual CalDAV event creation
-      // For now, simulate the operation with local storage
-      
+      // Validate input parameters
+      if (!userConfig) {
+        throw new Error('User configuration is required');
+      }
+      if (!userConfig.name) {
+        throw new Error('User name is required');
+      }
+      if (!date || !/^\d{4}-\d{2}-\d{2}$/.test(date)) {
+        throw new Error('Valid date in YYYY-MM-DD format is required');
+      }
+      if (!text || text.trim().length === 0) {
+        throw new Error('Event text is required');
+      }
+
+      // Generate event ID and structure
       const eventId = crypto.randomUUID();
       const event = {
         id: eventId,
         date: date,
-        text: text,
+        text: text.trim(),
         user: userConfig.name,
-        summary: text,
+        summary: text.trim(),
         dtstart: this._formatDateForCalDAV(date),
         dtend: this._formatDateForCalDAV(date),
         createdAt: new Date().toISOString(),
         updatedAt: new Date().toISOString()
       };
 
-      this.events.set(eventId, event);
+      // Create event via CalDAV
+      const caldavEvent = await this._createCalDAVEvent(userConfig, event);
       
-      console.log(`Calendar event created for ${userConfig.name}: ${text} on ${date}`);
-      
-      // TODO: When CalDAV library is available, replace with:
-      // const caldavEvent = await this._createCalDAVEvent(userConfig, event);
-      
-      return event;
+      return caldavEvent;
     } catch (error) {
-      console.error('Error creating calendar event:', error);
-      throw new Error('Failed to create calendar event');
+      throw new Error(`Failed to create calendar event: ${error.message}`);
     }
   }
 
@@ -59,26 +61,23 @@ class CalendarService {
    */
   async getEventsForMonth(userConfig, year, month) {
     try {
-      // TODO: Implement actual CalDAV event retrieval
-      // For now, filter local events
-      
-      const events = Array.from(this.events.values());
-      const filteredEvents = events.filter(event => {
-        if (event.user !== userConfig.name) return false;
-        const eventDate = new Date(event.date);
-        return eventDate.getFullYear() === parseInt(year) && 
-               (eventDate.getMonth() + 1) === parseInt(month);
-      });
+      // Validate input parameters
+      if (!userConfig || !userConfig.name) {
+        throw new Error('Valid user configuration is required');
+      }
+      if (!year || !/^\d{4}$/.test(year)) {
+        throw new Error('Valid year in YYYY format is required');
+      }
+      if (!month || !/^(0[1-9]|1[0-2])$/.test(month)) {
+        throw new Error('Valid month in MM format is required');
+      }
 
-      console.log(`Retrieved ${filteredEvents.length} events for ${userConfig.name} in ${year}-${month}`);
+      // Fetch events from CalDAV
+      const events = await this._fetchCalDAVEvents(userConfig, year, month);
       
-      // TODO: When CalDAV library is available, replace with:
-      // const caldavEvents = await this._fetchCalDAVEvents(userConfig, year, month);
-      
-      return filteredEvents;
+      return events;
     } catch (error) {
-      console.error('Error retrieving calendar events:', error);
-      throw new Error('Failed to retrieve calendar events');
+      throw new Error(`Failed to retrieve calendar events: ${error.message}`);
     }
   }
 
@@ -119,32 +118,23 @@ class CalendarService {
    */
   async updateEvent(userConfig, eventId, date, text) {
     try {
-      const event = this.events.get(eventId);
-      if (!event) {
-        throw new Error('Event not found');
-      }
+      // Build updated event object
+      const event = {
+        id: eventId,
+        date: date,
+        text: text,
+        user: userConfig.name,
+        summary: text,
+        dtstart: this._formatDateForCalDAV(date),
+        dtend: this._formatDateForCalDAV(date),
+        updatedAt: new Date().toISOString()
+      };
 
-      if (event.user !== userConfig.name) {
-        throw new Error('Permission denied: You can only edit your own events');
-      }
-
-      event.date = date;
-      event.text = text;
-      event.summary = text;
-      event.dtstart = this._formatDateForCalDAV(date);
-      event.dtend = this._formatDateForCalDAV(date);
-      event.updatedAt = new Date().toISOString();
-
-      this.events.set(eventId, event);
+      // Update event via CalDAV
+      const updatedEvent = await this._updateCalDAVEvent(userConfig, event);
       
-      console.log(`Calendar event updated for ${userConfig.name}: ${eventId}`);
-      
-      // TODO: When CalDAV library is available, replace with:
-      // await this._updateCalDAVEvent(userConfig, event);
-      
-      return event;
+      return updatedEvent;
     } catch (error) {
-      console.error('Error updating calendar event:', error);
       throw error;
     }
   }
@@ -157,25 +147,11 @@ class CalendarService {
    */
   async deleteEvent(userConfig, eventId) {
     try {
-      const event = this.events.get(eventId);
-      if (!event) {
-        throw new Error('Event not found');
-      }
-
-      if (event.user !== userConfig.name) {
-        throw new Error('Permission denied: You can only delete your own events');
-      }
-
-      this.events.delete(eventId);
-      
-      console.log(`Calendar event deleted for ${userConfig.name}: ${eventId}`);
-      
-      // TODO: When CalDAV library is available, replace with:
-      // await this._deleteCalDAVEvent(userConfig, eventId);
+      // Delete event via CalDAV
+      await this._deleteCalDAVEvent(userConfig, eventId);
       
       return true;
     } catch (error) {
-      console.error('Error deleting calendar event:', error);
       throw error;
     }
   }
@@ -187,8 +163,14 @@ class CalendarService {
    */
   async testConnection(userConfig) {
     try {
+      // Validate user configuration
+      if (!userConfig.nextcloudUrl || !userConfig.username || !userConfig.password) {
+        return false;
+      }
+
       // Basic HTTP test to verify Nextcloud instance is reachable
       const url = new URL(userConfig.nextcloudUrl);
+      
       const options = {
         hostname: url.hostname,
         port: url.port || (url.protocol === 'https:' ? 443 : 80),
@@ -202,38 +184,44 @@ class CalendarService {
 
       const protocol = url.protocol === 'https:' ? https : http;
       
-      return new Promise((resolve) => {
+      const result = await new Promise((resolve) => {
         const req = protocol.request(options, (res) => {
           let data = '';
-          res.on('data', chunk => data += chunk);
+          res.on('data', chunk => {
+            data += chunk;
+          });
+          
           res.on('end', () => {
             try {
               const status = JSON.parse(data);
               const isNextcloud = status.productname && status.productname.toLowerCase().includes('nextcloud');
-              console.log(`Connection test for ${userConfig.name}: ${isNextcloud ? 'SUCCESS' : 'NOT_NEXTCLOUD'}`);
               resolve(isNextcloud);
             } catch (e) {
-              console.log(`Connection test for ${userConfig.name}: INVALID_RESPONSE`);
               resolve(false);
             }
           });
         });
 
-        req.on('error', (error) => {
-          console.log(`Connection test for ${userConfig.name}: ERROR - ${error.message}`);
+        req.on('error', () => {
           resolve(false);
         });
 
         req.on('timeout', () => {
-          console.log(`Connection test for ${userConfig.name}: TIMEOUT`);
           req.destroy();
           resolve(false);
         });
 
         req.end();
       });
+
+      // If basic connection works, test CalDAV endpoint
+      if (result) {
+        const caldavResult = await this._testCalDAVConnection(userConfig);
+        return caldavResult;
+      }
+
+      return result;
     } catch (error) {
-      console.error('Error testing connection:', error);
       return false;
     }
   }
@@ -247,44 +235,520 @@ class CalendarService {
     return date.toISOString().slice(0, 10).replace(/-/g, '');
   }
 
-  // TODO: Implement these methods when @nextcloud/cdav-library is available
-  /*
+  /**
+   * Test CalDAV connection by trying to access the calendar endpoint
+   * @private
+   */
+  async _testCalDAVConnection(userConfig) {
+    try {
+      // Try to access the CalDAV principal endpoint
+      const caldavUrl = this._buildCalDAVUrl(userConfig);
+      
+      const url = new URL(caldavUrl);
+      const auth = Buffer.from(`${userConfig.username}:${userConfig.password}`).toString('base64');
+      
+      const options = {
+        hostname: url.hostname,
+        port: url.port || (url.protocol === 'https:' ? 443 : 80),
+        path: url.pathname,
+        method: 'PROPFIND',
+        timeout: 10000,
+        headers: {
+          'Authorization': `Basic ${auth}`,
+          'Content-Type': 'application/xml; charset=utf-8',
+          'Depth': '0',
+          'User-Agent': 'OpenWall/1.0 CalDAV-Client'
+        }
+      };
+
+      const protocol = url.protocol === 'https:' ? https : http;
+      
+      const body = `<?xml version="1.0" encoding="utf-8" ?>
+<D:propfind xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+  <D:prop>
+    <D:resourcetype/>
+    <D:displayname/>
+    <C:calendar-description/>
+  </D:prop>
+</D:propfind>`;
+
+      return new Promise((resolve) => {
+        const req = protocol.request(options, (res) => {
+          let data = '';
+          res.on('data', chunk => {
+            data += chunk;
+          });
+          
+          res.on('end', () => {
+            if (res.statusCode >= 200 && res.statusCode < 300) {
+              resolve(true);
+            } else {
+              resolve(false);
+            }
+          });
+        });
+
+        req.on('error', () => {
+          resolve(false);
+        });
+
+        req.on('timeout', () => {
+          req.destroy();
+          resolve(false);
+        });
+
+        req.write(body);
+        req.end();
+      });
+    } catch (error) {
+      return false;
+    }
+  }
+
+  /**
+   * Build CalDAV URL for a user
+   * @private
+   */
+  _buildCalDAVUrl(userConfig) {
+    // Remove trailing slash from nextcloudUrl if present
+    const baseUrl = userConfig.nextcloudUrl.replace(/\/$/, '');
+    
+    // Build CalDAV principal URL - this is the standard Nextcloud CalDAV path
+    const calendarName = userConfig.calendarName || 'personal';
+    return `${baseUrl}/remote.php/dav/calendars/${userConfig.username}/${calendarName}/`;
+  }
+
+  /**
+   * Build CalDAV principals URL for a user
+   * @private
+   */
+  _buildCalDAVPrincipalsUrl(userConfig) {
+    const baseUrl = userConfig.nextcloudUrl.replace(/\/$/, '');
+    return `${baseUrl}/remote.php/dav/principals/users/${userConfig.username}/`;
+  }
+
+  /**
+   * Create a CalDAV event
+   * @private
+   */
   async _createCalDAVEvent(userConfig, event) {
-    const { createClient } = require('@nextcloud/cdav-library');
-    const client = createClient({
-      url: userConfig.nextcloudUrl,
-      username: userConfig.username,
-      password: userConfig.password
-    });
-    
-    // Create ICS event content
-    const icsContent = this._generateICSEvent(event);
-    
-    // Create event on Nextcloud
-    const result = await client.createEvent(icsContent);
-    return result;
+    try {
+      const caldavUrl = this._buildCalDAVUrl(userConfig);
+      const eventUrl = `${caldavUrl}${event.id}.ics`;
+      
+      const url = new URL(eventUrl);
+      const auth = Buffer.from(`${userConfig.username}:${userConfig.password}`).toString('base64');
+      
+      const icsContent = this._generateICSEvent(event);
+      
+      const options = {
+        hostname: url.hostname,
+        port: url.port || (url.protocol === 'https:' ? 443 : 80),
+        path: url.pathname,
+        method: 'PUT',
+        timeout: 10000,
+        headers: {
+          'Authorization': `Basic ${auth}`,
+          'Content-Type': 'text/calendar; charset=utf-8',
+          'Content-Length': Buffer.byteLength(icsContent, 'utf8'),
+          'User-Agent': 'OpenWall/1.0 CalDAV-Client',
+          'If-None-Match': '*' // Prevent overwriting existing events
+        }
+      };
+
+      const protocol = url.protocol === 'https:' ? https : http;
+      
+      return new Promise((resolve, reject) => {
+        const req = protocol.request(options, (res) => {
+          let data = '';
+          res.on('data', chunk => {
+            data += chunk;
+          });
+          
+          res.on('end', () => {
+            if (res.statusCode >= 200 && res.statusCode < 300) {
+              resolve(event);
+            } else if (res.statusCode === 401) {
+              reject(new Error('CalDAV authentication failed'));
+            } else if (res.statusCode === 412) {
+              reject(new Error('CalDAV event already exists'));
+            } else {
+              reject(new Error(`CalDAV event creation failed with status ${res.statusCode}: ${data}`));
+            }
+          });
+        });
+
+        req.on('error', (error) => {
+          reject(new Error(`CalDAV request failed: ${error.message}`));
+        });
+
+        req.on('timeout', () => {
+          req.destroy();
+          reject(new Error('CalDAV request timeout'));
+        });
+
+        req.write(icsContent);
+        req.end();
+      });
+    } catch (error) {
+      throw error;
+    }
   }
 
+  /**
+   * Fetch CalDAV events
+   * @private
+   */
   async _fetchCalDAVEvents(userConfig, year, month) {
-    const { createClient } = require('@nextcloud/cdav-library');
-    const client = createClient({
-      url: userConfig.nextcloudUrl,
-      username: userConfig.username,
-      password: userConfig.password
-    });
-    
-    const startDate = new Date(year, month - 1, 1);
-    const endDate = new Date(year, month, 0);
-    
-    const events = await client.fetchCalendarEvents({
-      start: startDate,
-      end: endDate
-    });
-    
-    return events;
+    try {
+      const caldavUrl = this._buildCalDAVUrl(userConfig);
+      
+      const url = new URL(caldavUrl);
+      const auth = Buffer.from(`${userConfig.username}:${userConfig.password}`).toString('base64');
+      
+      // Build date range for the month
+      const startDate = new Date(parseInt(year), parseInt(month) - 1, 1);
+      const endDate = new Date(parseInt(year), parseInt(month), 0);
+      
+      const startDateStr = startDate.toISOString().slice(0, 10).replace(/-/g, '') + 'T000000Z';
+      const endDateStr = endDate.toISOString().slice(0, 10).replace(/-/g, '') + 'T235959Z';
+      
+      const reportBody = `<?xml version="1.0" encoding="utf-8" ?>
+<C:calendar-query xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+  <D:prop>
+    <D:getetag/>
+    <C:calendar-data/>
+  </D:prop>
+  <C:filter>
+    <C:comp-filter name="VCALENDAR">
+      <C:comp-filter name="VEVENT">
+        <C:time-range start="${startDateStr}" end="${endDateStr}"/>
+      </C:comp-filter>
+    </C:comp-filter>
+  </C:filter>
+</C:calendar-query>`;
+      
+      const options = {
+        hostname: url.hostname,
+        port: url.port || (url.protocol === 'https:' ? 443 : 80),
+        path: url.pathname,
+        method: 'REPORT',
+        timeout: 10000,
+        headers: {
+          'Authorization': `Basic ${auth}`,
+          'Content-Type': 'application/xml; charset=utf-8',
+          'Content-Length': Buffer.byteLength(reportBody, 'utf8'),
+          'Depth': '1',
+          'User-Agent': 'OpenWall/1.0 CalDAV-Client'
+        }
+      };
+
+      const protocol = url.protocol === 'https:' ? https : http;
+      
+      return new Promise((resolve, reject) => {
+        const req = protocol.request(options, (res) => {
+          let data = '';
+          res.on('data', chunk => {
+            data += chunk;
+          });
+          
+          res.on('end', () => {
+            if (res.statusCode >= 200 && res.statusCode < 300) {
+              try {
+                const events = this._parseCalDAVResponse(data, userConfig);
+                resolve(events);
+              } catch (parseError) {
+                reject(parseError);
+              }
+            } else if (res.statusCode === 401) {
+              reject(new Error('CalDAV authentication failed'));
+            } else {
+              reject(new Error(`CalDAV event fetch failed with status ${res.statusCode}: ${data}`));
+            }
+          });
+        });
+
+        req.on('error', (error) => {
+          reject(new Error(`CalDAV request failed: ${error.message}`));
+        });
+
+        req.on('timeout', () => {
+          req.destroy();
+          reject(new Error('CalDAV request timeout'));
+        });
+
+        req.write(reportBody);
+        req.end();
+      });
+    } catch (error) {
+      throw error;
+    }
   }
 
+  /**
+   * Parse CalDAV response and extract events
+   * @private
+   */
+  _parseCalDAVResponse(xmlData, userConfig) {
+    try {
+      // This is a basic parser - in a real implementation, you'd use a proper XML parser
+      const events = [];
+      
+      // Look for calendar-data with different possible namespace prefixes
+      const eventMatches = xmlData.match(/<(?:C:|cal:)?calendar-data[^>]*>([\s\S]*?)<\/(?:C:|cal:)?calendar-data>/gi);
+      
+      if (eventMatches) {
+        eventMatches.forEach((match, index) => {
+          try {
+            // Extract the VCALENDAR content - handle CDATA and escaped content
+            let icsContent = match
+              .replace(/<!\[CDATA\[([\s\S]*?)\]\]>/g, '$1') // Remove CDATA wrapper
+              .replace(/<[^>]*>/g, '') // Remove XML tags
+              .replace(/&lt;/g, '<') // Decode HTML entities
+              .replace(/&gt;/g, '>')
+              .replace(/&amp;/g, '&')
+              .replace(/&quot;/g, '"')
+              .trim();
+            
+            const event = this._parseICSEvent(icsContent, userConfig);
+            
+            if (event) {
+              events.push(event);
+            }
+          } catch (eventError) {
+            // Skip individual events that fail to parse
+          }
+        });
+      }
+      
+      return events;
+    } catch (error) {
+      throw new Error(`Failed to parse CalDAV response: ${error.message}`);
+    }
+  }
+
+  /**
+   * Parse ICS event content
+   * @private
+   */
+  _parseICSEvent(icsContent, userConfig) {
+    try {
+      const lines = icsContent.split('\n').map(line => line.trim()).filter(line => line);
+      
+      const event = {
+        user: userConfig.name,
+        source: 'caldav'
+      };
+      
+      for (const line of lines) {
+        if (line.startsWith('UID:')) {
+          event.id = line.substring(4);
+        } else if (line.startsWith('SUMMARY:')) {
+          event.text = line.substring(8);
+          event.summary = event.text;
+        } else if (line.startsWith('DTSTART')) {
+          const dateValue = line.split(':')[1];
+          event.dtstart = dateValue;
+          // Parse date more robustly
+          if (dateValue && dateValue.length >= 8) {
+            // Handle different DTSTART formats: YYYYMMDD, YYYYMMDDTHHMMSSZ, etc.
+            const dateOnly = dateValue.substring(0, 8);
+            if (/^\d{8}$/.test(dateOnly)) {
+              const year = parseInt(dateOnly.substring(0, 4));
+              const month = parseInt(dateOnly.substring(4, 6));
+              const day = parseInt(dateOnly.substring(6, 8));
+              
+              // Validate the parsed date and ensure it's reasonable (not from 1981!)
+              if (year >= 2020 && year <= 2030 && month >= 1 && month <= 12 && day >= 1 && day <= 31) {
+                const parsedDate = new Date(year, month - 1, day);
+                if (!isNaN(parsedDate.getTime()) && 
+                    parsedDate.getFullYear() === year && 
+                    parsedDate.getMonth() === (month - 1) && 
+                    parsedDate.getDate() === day) {
+                  event.date = `${year}-${month.toString().padStart(2, '0')}-${day.toString().padStart(2, '0')}`;
+                }
+              }
+            }
+          }
+        } else if (line.startsWith('DTEND')) {
+          const dateValue = line.split(':')[1];
+          event.dtend = dateValue;
+          // If we don't have a start date yet, try to get it from end date
+          if (!event.date && dateValue && dateValue.length >= 8) {
+            const dateOnly = dateValue.substring(0, 8);
+            if (/^\d{8}$/.test(dateOnly)) {
+              const year = parseInt(dateOnly.substring(0, 4));
+              const month = parseInt(dateOnly.substring(4, 6));
+              const day = parseInt(dateOnly.substring(6, 8));
+              
+              // Validate the parsed date and ensure it's reasonable (not from 1981!)
+              if (year >= 2020 && year <= 2030 && month >= 1 && month <= 12 && day >= 1 && day <= 31) {
+                const parsedDate = new Date(year, month - 1, day);
+                if (!isNaN(parsedDate.getTime()) && 
+                    parsedDate.getFullYear() === year && 
+                    parsedDate.getMonth() === (month - 1) && 
+                    parsedDate.getDate() === day) {
+                  event.date = `${year}-${month.toString().padStart(2, '0')}-${day.toString().padStart(2, '0')}`;
+                }
+              }
+            }
+          }
+        } else if (line.startsWith('CREATED:')) {
+          event.createdAt = line.substring(8);
+        } else if (line.startsWith('LAST-MODIFIED:')) {
+          event.updatedAt = line.substring(14);
+        }
+      }
+      
+      // Only return events with required fields and valid dates
+      if (event.id && event.text && event.date) {
+        return event;
+      } else {
+        return null;
+      }
+    } catch (error) {
+      return null;
+    }
+  }
+
+  /**
+   * Update a CalDAV event
+   * @private
+   */
+  async _updateCalDAVEvent(userConfig, event) {
+    try {
+      const caldavUrl = this._buildCalDAVUrl(userConfig);
+      const eventUrl = `${caldavUrl}${event.id}.ics`;
+      
+      const url = new URL(eventUrl);
+      const auth = Buffer.from(`${userConfig.username}:${userConfig.password}`).toString('base64');
+      
+      const icsContent = this._generateICSEvent(event);
+      
+      const options = {
+        hostname: url.hostname,
+        port: url.port || (url.protocol === 'https:' ? 443 : 80),
+        path: url.pathname,
+        method: 'PUT',
+        timeout: 10000,
+        headers: {
+          'Authorization': `Basic ${auth}`,
+          'Content-Type': 'text/calendar; charset=utf-8',
+          'Content-Length': Buffer.byteLength(icsContent, 'utf8'),
+          'User-Agent': 'OpenWall/1.0 CalDAV-Client'
+        }
+      };
+
+      const protocol = url.protocol === 'https:' ? https : http;
+      
+      return new Promise((resolve, reject) => {
+        const req = protocol.request(options, (res) => {
+          let data = '';
+          res.on('data', chunk => {
+            data += chunk;
+          });
+          
+          res.on('end', () => {
+            if (res.statusCode >= 200 && res.statusCode < 300) {
+              resolve(event);
+            } else if (res.statusCode === 401) {
+              reject(new Error('CalDAV authentication failed'));
+            } else if (res.statusCode === 404) {
+              reject(new Error('Event not found'));
+            } else {
+              reject(new Error(`CalDAV event update failed with status ${res.statusCode}: ${data}`));
+            }
+          });
+        });
+
+        req.on('error', (error) => {
+          reject(new Error(`CalDAV request failed: ${error.message}`));
+        });
+
+        req.on('timeout', () => {
+          req.destroy();
+          reject(new Error('CalDAV request timeout'));
+        });
+
+        req.write(icsContent);
+        req.end();
+      });
+    } catch (error) {
+      throw error;
+    }
+  }
+
+  /**
+   * Delete a CalDAV event
+   * @private
+   */
+  async _deleteCalDAVEvent(userConfig, eventId) {
+    try {
+      const caldavUrl = this._buildCalDAVUrl(userConfig);
+      const eventUrl = `${caldavUrl}${eventId}.ics`;
+      
+      const url = new URL(eventUrl);
+      const auth = Buffer.from(`${userConfig.username}:${userConfig.password}`).toString('base64');
+      
+      const options = {
+        hostname: url.hostname,
+        port: url.port || (url.protocol === 'https:' ? 443 : 80),
+        path: url.pathname,
+        method: 'DELETE',
+        timeout: 10000,
+        headers: {
+          'Authorization': `Basic ${auth}`,
+          'User-Agent': 'OpenWall/1.0 CalDAV-Client'
+        }
+      };
+
+      const protocol = url.protocol === 'https:' ? https : http;
+      
+      return new Promise((resolve, reject) => {
+        const req = protocol.request(options, (res) => {
+          let data = '';
+          res.on('data', chunk => {
+            data += chunk;
+          });
+          
+          res.on('end', () => {
+            if (res.statusCode >= 200 && res.statusCode < 300) {
+              resolve(true);
+            } else if (res.statusCode === 401) {
+              reject(new Error('CalDAV authentication failed'));
+            } else if (res.statusCode === 404) {
+              reject(new Error('Event not found'));
+            } else {
+              reject(new Error(`CalDAV event deletion failed with status ${res.statusCode}: ${data}`));
+            }
+          });
+        });
+
+        req.on('error', (error) => {
+          reject(new Error(`CalDAV request failed: ${error.message}`));
+        });
+
+        req.on('timeout', () => {
+          req.destroy();
+          reject(new Error('CalDAV request timeout'));
+        });
+
+        req.end();
+      });
+    } catch (error) {
+      throw error;
+    }
+  }
+
+  /**
+   * Generate ICS event content
+   * @private
+   */
   _generateICSEvent(event) {
+    const now = new Date().toISOString().replace(/[-:]/g, '').split('.')[0] + 'Z';
+    const created = event.createdAt ? new Date(event.createdAt).toISOString().replace(/[-:]/g, '').split('.')[0] + 'Z' : now;
+    const modified = event.updatedAt ? new Date(event.updatedAt).toISOString().replace(/[-:]/g, '').split('.')[0] + 'Z' : now;
+    
     return `BEGIN:VCALENDAR
 VERSION:2.0
 PRODID:-//OpenWall//Calendar//EN
@@ -294,12 +758,12 @@ DTSTART;VALUE=DATE:${event.dtstart}
 DTEND;VALUE=DATE:${event.dtend}
 SUMMARY:${event.summary}
 DESCRIPTION:${event.text}
-CREATED:${new Date(event.createdAt).toISOString().replace(/[-:]/g, '').split('.')[0]}Z
-LAST-MODIFIED:${new Date(event.updatedAt).toISOString().replace(/[-:]/g, '').split('.')[0]}Z
+CREATED:${created}
+LAST-MODIFIED:${modified}
+DTSTAMP:${now}
 END:VEVENT
 END:VCALENDAR`;
   }
-  */
 }
 
 module.exports = new CalendarService();