Calendar Events

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Without this, an all-day date\n// like 20260902 becomes UTC midnight, which is 5pm the *previous* day in\n// Pacific — so the event renders one day early.\nexport function zonedWallClockToUtc(\n year: number,\n month: number,\n day: number,\n hour = 0,\n minute = 0,\n second = 0,\n timeZone: string = CALENDAR_TIME_ZONE,\n): Date {\n const asIfUtc = Date.UTC(year, month - 1, day, hour, minute, second);\n\n // Guess using the offset in effect at that UTC instant, then re-check in\n // case the guess landed on the far side of a DST transition.\n const guessOffset = timeZoneOffsetMs(new Date(asIfUtc), timeZone);\n const guess = new Date(asIfUtc - guessOffset);\n const actualOffset = timeZoneOffsetMs(guess, timeZone);\n\n return actualOffset === guessOffset ? guess : new Date(asIfUtc - actualOffset);\n}\n\nexport function parseICalEvents(\n icalData: string,\n startDate: Date,\n endDate: Date,\n): CalendarEvent[] {\n const events: CalendarEvent[] = [];\n\n // First, unfold the lines (continuation lines start with space/tab)\n const rawLines = icalData.split(/\\r?\\n/);\n const unfoldedLines: string[] = [];\n\n for (let i = 0; i < rawLines.length; i++) {\n const line = rawLines[i];\n\n // If this line starts with space or tab, it's a continuation\n if (line.startsWith(\" \") || line.startsWith(\"\\t\")) {\n // Append to the previous line (removing the leading whitespace)\n if (unfoldedLines.length > 0) {\n unfoldedLines[unfoldedLines.length - 1] += line.substring(1);\n }\n } else {\n // New line\n unfoldedLines.push(line);\n }\n }\n\n let currentEvent:\n | Partial & {\n rrule?: string;\n timezone?: string;\n dtstart?: string;\n }\n | null = null;\n let inEvent = false;\n\n for (const line of unfoldedLines) {\n const trimmedLine = line.trim();\n\n if (trimmedLine === \"BEGIN:VEVENT\") {\n inEvent = true;\n currentEvent = {};\n } else if (trimmedLine === \"END:VEVENT\" && inEvent) {\n if (currentEvent && currentEvent.start) {\n // If this event has a recurrence rule, expand it\n if (currentEvent.rrule && currentEvent.dtstart) {\n const expandedEvents = expandRecurringEvent(\n currentEvent,\n startDate,\n endDate,\n );\n events.push(...expandedEvents);\n } else {\n // Check if single event is in our date range\n const eventDate = new Date(currentEvent.start);\n if (eventDate >= startDate && eventDate <= endDate) {\n events.push(currentEvent as CalendarEvent);\n }\n }\n }\n currentEvent = null;\n inEvent = false;\n } else if (inEvent && currentEvent) {\n if (trimmedLine.startsWith(\"SUMMARY:\")) {\n currentEvent.summary = trimmedLine.substring(8);\n } else if (trimmedLine.startsWith(\"DESCRIPTION:\")) {\n currentEvent.description = trimmedLine.substring(12);\n } else if (trimmedLine.startsWith(\"RRULE:\")) {\n currentEvent.rrule = trimmedLine.substring(6);\n } else if (trimmedLine.startsWith(\"DTSTART\")) {\n // Store the raw DTSTART line for timezone-aware parsing\n currentEvent.dtstart = trimmedLine;\n\n // Parse the timezone if present\n if (trimmedLine.includes(\"TZID=\")) {\n const tzMatch = trimmedLine.match(/TZID=([^:]+):/);\n if (tzMatch) {\n currentEvent.timezone = tzMatch[1];\n }\n }\n\n const dateValue = trimmedLine.split(\":\")[1];\n if (dateValue) {\n // Handle both date-time and date-only formats\n const dateTimeMatch = dateValue.match(\n /^(\\d{4})(\\d{2})(\\d{2})T(\\d{2})(\\d{2})(\\d{2})(Z?)/,\n );\n const dateOnlyMatch = dateValue.match(/^(\\d{4})(\\d{2})(\\d{2})$/);\n\n if (dateTimeMatch) {\n const [, y, mo, d, h, mi, s, zulu] = dateTimeMatch;\n if (zulu === \"Z\") {\n // Already UTC: 20240115T140000Z\n currentEvent.start = `${y}-${mo}-${d}T${h}:${mi}:${s}Z`;\n } else {\n // Wall-clock time with no offset (either TZID-qualified or\n // floating), so interpret it in the event's own zone.\n currentEvent.start = zonedWallClockToUtc(\n +y,\n +mo,\n +d,\n +h,\n +mi,\n +s,\n currentEvent.timezone ?? CALENDAR_TIME_ZONE,\n ).toISOString();\n }\n currentEvent.isAllDay = false;\n } else if (dateOnlyMatch) {\n // All-day event (DTSTART;VALUE=DATE:20240115). A bare date has no\n // time or zone, so anchor it to midnight in the calendar's zone.\n // Treating it as UTC midnight would land it the previous evening\n // in Pacific and render the event a day early.\n const [, y, mo, d] = dateOnlyMatch;\n currentEvent.start = zonedWallClockToUtc(+y, +mo, +d).toISOString();\n currentEvent.isAllDay = true;\n }\n }\n }\n }\n }\n\n // Sort events by start time\n return events.sort((a, b) =>\n new Date(a.start).getTime() - new Date(b.start).getTime()\n );\n}\n\n// Parses an RRULE UNTIL value, which per RFC 5545 is either an all-day date\n// (YYYYMMDD) or a date-time (YYYYMMDDTHHMMSSZ, typically in UTC).\nfunction parseRRuleUntil(untilStr: string): Date | null {\n const match = untilStr.match(\n /^(\\d{4})(\\d{2})(\\d{2})(T(\\d{2})(\\d{2})(\\d{2})Z?)?$/,\n );\n if (!match) return null;\n\n const [, year, month, day, hasTime, hour, minute, second] = match;\n\n if (hasTime) {\n return new Date(Date.UTC(\n parseInt(year),\n parseInt(month) - 1,\n parseInt(day),\n parseInt(hour),\n parseInt(minute),\n parseInt(second),\n ));\n }\n\n // Date-only UNTIL is inclusive of the entire day\n return new Date(Date.UTC(\n parseInt(year),\n parseInt(month) - 1,\n parseInt(day),\n 23,\n 59,\n 59,\n ));\n}\n\nfunction expandRecurringEvent(\n event: Partial & {\n rrule: string;\n timezone?: string;\n dtstart: string;\n },\n startDate: Date,\n endDate: Date,\n): CalendarEvent[] {\n const expandedEvents: CalendarEvent[] = [];\n\n // Parse RRULE\n const rruleParts = event.rrule.split(\";\").reduce((acc, part) => {\n const [key, value] = part.split(\"=\");\n acc[key] = value;\n return acc;\n }, {} as Record);\n\n const freq = rruleParts.FREQ;\n const byDay = rruleParts.BYDAY;\n const until = rruleParts.UNTIL ? parseRRuleUntil(rruleParts.UNTIL) : null;\n const count = rruleParts.COUNT ? parseInt(rruleParts.COUNT, 10) : null;\n\n if (!freq) return [];\n\n // The recurrence itself stops at whichever is earlier: the caller's query\n // window end, or the rule's own UNTIL date. This lets a rule like\n // \"every Monday until March 1st\" stop correctly even if the caller asks\n // for a much wider date range.\n const effectiveEndDate = until && until < endDate ? until : endDate;\n\n // Parse the original start date\n const dtstartValue = event.dtstart.split(\":\")[1];\n if (!dtstartValue) return [];\n\n // Parse the base date and time\n const match = dtstartValue.match(\n /(\\d{4})(\\d{2})(\\d{2})T(\\d{2})(\\d{2})(\\d{2})/,\n );\n if (!match) return [];\n\n const [, year, month, day, hour, minute, second] = match;\n\n // Create base date in the specified timezone (or UTC if none)\n const baseDate = event.timezone\n ? zonedWallClockToUtc(\n +year,\n +month,\n +day,\n +hour,\n +minute,\n +second,\n event.timezone,\n )\n : new Date(`${year}-${month}-${day}T${hour}:${minute}:${second}Z`);\n\n // Start from the base date, but we'll fast-forward to find occurrences in our range\n let currentDate = new Date(baseDate);\n\n // Generate instances up to the end date (with a reasonable limit)\n let iterationCount = 0;\n const maxIterations = 100; // Safety limit\n\n // Tracks EVERY occurrence generated from DTSTART onward (not just ones\n // that land inside [startDate, endDate]), since RRULE's COUNT counts\n // occurrences from DTSTART, including ones before the query window.\n let occurrenceCount = 0;\n\n while (currentDate <= effectiveEndDate && iterationCount < maxIterations) {\n if (count !== null && occurrenceCount >= count) break;\n\n iterationCount++;\n\n // For MONTHLY with BYDAY, we need to find the specific day in the month\n if (freq === \"MONTHLY\" && byDay) {\n const targetDate = findByDayInMonth(currentDate, byDay);\n if (targetDate && targetDate <= effectiveEndDate) {\n occurrenceCount++;\n if (count !== null && occurrenceCount > count) break;\n\n // Check if this instance is within our range\n if (targetDate >= startDate && targetDate <= endDate) {\n expandedEvents.push({\n summary: event.summary,\n description: event.description,\n start: targetDate.toISOString(),\n isAllDay: event.isAllDay || false,\n });\n }\n }\n // Move to next month\n currentDate.setMonth(currentDate.getMonth() + 1);\n } else {\n if (currentDate <= effectiveEndDate) {\n occurrenceCount++;\n if (count !== null && occurrenceCount > count) break;\n\n // Check if this instance is within our range\n if (currentDate >= startDate) {\n expandedEvents.push({\n summary: event.summary,\n description: event.description,\n start: currentDate.toISOString(),\n isAllDay: event.isAllDay || false,\n });\n }\n }\n\n // Move to the next occurrence based on frequency\n if (freq === \"MONTHLY\") {\n currentDate.setMonth(currentDate.getMonth() + 1);\n } else if (freq === \"WEEKLY\") {\n currentDate.setDate(currentDate.getDate() + 7);\n } else if (freq === \"DAILY\") {\n currentDate.setDate(currentDate.getDate() + 1);\n } else if (freq === \"YEARLY\") {\n currentDate.setFullYear(currentDate.getFullYear() + 1);\n } else {\n // Unknown frequency, break to avoid infinite loop\n break;\n }\n }\n }\n\n return expandedEvents;\n}\n\nfunction findByDayInMonth(date: Date, byDay: string): Date | null {\n // BYDAY format examples: \"2FR\" = 2nd Friday, \"MO\" = every Monday, \"-1SA\" = last Saturday\n\n const weekdayMap: Record = {\n SU: 0,\n MO: 1,\n TU: 2,\n WE: 3,\n TH: 4,\n FR: 5,\n SA: 6,\n };\n\n // Extract the position and day\n const match = byDay.match(/^(-?\\d+)?([A-Z]{2})$/);\n if (!match) return null;\n\n const [, posStr, dayCode] = match;\n const targetWeekday = weekdayMap[dayCode];\n\n if (targetWeekday === undefined) return null;\n\n const year = date.getFullYear();\n const month = date.getMonth();\n const hour = date.getHours();\n const minute = date.getMinutes();\n const second = date.getSeconds();\n\n if (!posStr) {\n // No position specified - this would match every occurrence (not typically used in RRULE)\n return null;\n }\n\n const position = parseInt(posStr);\n\n if (position > 0) {\n // Find the Nth occurrence of the weekday in the month\n const firstDayOfMonth = new Date(Date.UTC(year, month, 1));\n const firstWeekday = firstDayOfMonth.getUTCDay();\n\n // Calculate the date of the first occurrence of target weekday\n let daysUntilTarget = (targetWeekday - firstWeekday + 7) % 7;\n let targetDate = 1 + daysUntilTarget;\n\n // Add weeks to get to the Nth occurrence\n targetDate += (position - 1) * 7;\n\n // Check if this date exists in the month\n const resultDate = new Date(\n Date.UTC(year, month, targetDate, hour, minute, second),\n );\n if (resultDate.getUTCMonth() !== month) {\n // Date doesn't exist (e.g., 5th Monday in a month with only 4)\n return null;\n }\n\n return resultDate;\n } else {\n // Negative position: find from the end of the month\n const lastDayOfMonth = new Date(Date.UTC(year, month + 1, 0));\n const lastDate = lastDayOfMonth.getUTCDate();\n const lastWeekday = lastDayOfMonth.getUTCDay();\n\n // Find the last occurrence of the target weekday\n let daysBack = (lastWeekday - targetWeekday + 7) % 7;\n let targetDate = lastDate - daysBack;\n\n // Go back the specified number of weeks\n targetDate -= (Math.abs(position) - 1) * 7;\n\n if (targetDate < 1) {\n return null;\n }\n\n return new Date(Date.UTC(year, month, targetDate, hour, minute, second));\n }\n}\n\nfunction matchesByDay(date: Date, byDay: string): boolean {\n // BYDAY format examples: \"2FR\" = 2nd Friday, \"MO\" = every Monday, \"-1SA\" = last Saturday\n\n const weekdayMap: Record = {\n SU: 0,\n MO: 1,\n TU: 2,\n WE: 3,\n TH: 4,\n FR: 5,\n SA: 6,\n };\n\n // Extract the position and day\n const match = byDay.match(/^(-?\\d+)?([A-Z]{2})$/);\n if (!match) return false;\n\n const [, posStr, dayCode] = match;\n const targetWeekday = weekdayMap[dayCode];\n\n if (targetWeekday === undefined) return false;\n\n const actualWeekday = date.getDay();\n\n // If no position specified, just match the weekday\n if (!posStr) {\n return actualWeekday === targetWeekday;\n }\n\n const position = parseInt(posStr);\n\n // Check if it's the correct weekday\n if (actualWeekday !== targetWeekday) return false;\n\n // Calculate which occurrence of this weekday it is in the month\n const dayOfMonth = date.getDate();\n const occurrenceInMonth = Math.ceil(dayOfMonth / 7);\n\n if (position > 0) {\n // Positive position: 1st, 2nd, 3rd, etc.\n return occurrenceInMonth === position;\n } else {\n // Negative position: last (-1), second to last (-2), etc.\n // Calculate from the end of the month\n const year = date.getFullYear();\n const month = date.getMonth();\n const lastDayOfMonth = new Date(year, month + 1, 0).getDate();\n const daysFromEnd = lastDayOfMonth - dayOfMonth;\n const occurrenceFromEnd = Math.floor(daysFromEnd / 7) + 1;\n return occurrenceFromEnd === Math.abs(position);\n }\n}\n\nexport async function generateHTML(\n events: CalendarEvent[],\n isPreview: boolean = false,\n fullViewUrl: string = \"\",\n): Promise {\n // Load the HTML template\n const templateUrl = import.meta.resolve(\"../template.html\");\n const templateResponse = await fetch(templateUrl);\n const template = await templateResponse.text();\n\n // Generate event HTML\n const eventHTML = events.map((event) => {\n // Parse event date/time\n const startDateTime = event.start;\n if (!startDateTime) return \"\";\n\n // Convert to Pacific Time\n const eventDate = new Date(startDateTime);\n const pacificDate = new Intl.DateTimeFormat(\"en-US\", {\n timeZone: \"America/Los_Angeles\",\n weekday: \"long\",\n month: \"long\",\n day: \"numeric\",\n hour: !event.isAllDay ? \"numeric\" : undefined,\n minute: !event.isAllDay ? \"2-digit\" : undefined,\n hour12: !event.isAllDay ? true : undefined,\n }).format(eventDate);\n\n const title = event.summary || \"Untitled Event\";\n const description = event.description || \"\";\n\n // Convert description to paragraphs\n // iCal uses \\n as the escape sequence for newlines in the data\n // iCal uses \\, for commas\n const descriptionParagraphs = description\n .replace(/\\\\,/g, \",\") // Convert escaped commas\n .replace(/\\\\n/g, \"\\n\") // Convert literal \\n to actual newlines\n .split(\"\\n\")\n .filter((p) => p.trim())\n .map((p) => `

${escapeHtml(p.trim())}

`)\n .join(\"\");\n\n return `\n

${escapeHtml(pacificDate)}

${escapeHtml(title)}

\n ${descriptionParagraphs}\n

\n `;\n }).join(\"\");\n\n // Replace the placeholder with actual content\n const eventsContent = eventHTML ||\n \"

No events coming up.

\";\n\n let html = template.replace(\"{{EVENTS_CONTENT}}\", eventsContent);\n\n // Replace preview mode placeholders\n if (isPreview) {\n html = html.replace(\"{{PREVIEW_CLASS}}\", ' class=\"preview-mode\"');\n html = html.replace(\n \"{{PREVIEW_LINK}}\",\n `See all upcoming events`,\n );\n } else {\n html = html.replace(\"{{PREVIEW_CLASS}}\", \"\");\n html = html.replace(\"{{PREVIEW_LINK}}\", \"\");\n }\n\n return html;\n}\n\nfunction escapeHtml(text: string): string {\n return text\n .replace(/&/g, \"&\")\n .replace(//g, \">\")\n .replace(/\"/g, \""\")\n .replace(/'/g, \"'\");\n}",[19,60],"088d9366-046a-11f1-a639-42dde27851f2","directory",["D",1770498888162],30,[19],{"_35":67,"_13":19,"_38":41,"_40":-5,"_42":43,"_44":70,"_46":47,"_48":105,"_17":50,"_51":68,"_53":-5,"_55":56,"_57":-5,"_83":106,"_18":107},{"_35":96,"_13":97,"_38":98,"_40":-5,"_42":43,"_44":99,"_46":47,"_48":100,"_17":101,"_51":24,"_53":102,"_55":56,"_57":-5,"_83":103,"_18":104},{"_35":86,"_13":87,"_38":88,"_40":-5,"_42":43,"_44":89,"_46":47,"_48":90,"_17":91,"_51":92,"_53":93,"_55":56,"_57":14,"_83":94,"_18":95},{"_35":76,"_13":77,"_38":78,"_40":-5,"_42":43,"_44":79,"_46":47,"_48":80,"_17":81,"_51":24,"_53":82,"_55":56,"_57":-5,"_83":84,"_18":85},"dafdc7a6-09ee-11f1-b236-42dde27851f2","template.html","dbb01d78-0473-11f1-9881-42dde27851f2",105,["D",1771105690597],33,"\n\n \n \n \n Calendar Events\n \n \n \n

Upcoming Events

\n {{EVENTS_CONTENT}} {{PREVIEW_LINK}}\n \n","children",[],[77],"5923b0a4-09eb-11f1-8e20-42dde27851f2","index.ts","0aa20276-f3fe-11f0-ae7d-42dde27851f2",87,["D",1771104184257],48,"http","import { Hono } from \"https://esm.sh/hono@3.11.7\";\nimport { googleTranslate } from \"https://esm.town/v/halffullheart/dpispta/shared/google-translate.ts\";\nimport { generateHTML, parseICalEvents } from \"./shared/calendar.ts\";\nimport { getCalendarUrl } from \"./shared/env.ts\";\n\nconst app = new Hono();\n\n// Unwrap Hono errors to see original error details\napp.onError((err) => Promise.reject(err));\n\n// Main calendar endpoint\napp.get(\"/\", async (c) => {\n try {\n // Get language code from query parameter (default to null/no translation)\n const lang = c.req.query(\"lang\");\n // Get preview mode from query parameter\n const isPreview = c.req.query(\"preview\") !== undefined;\n\n // Get calendar ID from environment variable\n const calendarUrl = getCalendarUrl();\n\n // Calculate date range (yesterday to 2 months from today)\n const now = new Date();\n const yesterday = new Date(now);\n yesterday.setDate(yesterday.getDate() - 1);\n yesterday.setHours(0, 0, 0, 0);\n\n const twoMonthsFromNow = new Date(now);\n twoMonthsFromNow.setMonth(twoMonthsFromNow.getMonth() + 2);\n twoMonthsFromNow.setHours(23, 59, 59, 999);\n\n console.log(\"Fetching calendar events from\", calendarUrl);\n\n const response = await fetch(calendarUrl);\n\n if (!response.ok) {\n const errorText = await response.text();\n return c.text(\n `Failed to fetch calendar events: ${response.status} ${errorText}`,\n 500,\n );\n }\n\n // Parse iCal data\n const icalData = await response.text();\n const events = parseICalEvents(icalData, yesterday, twoMonthsFromNow);\n\n // Build the URL for \"See all events\" link (base URL without preview param)\n const baseUrl = new URL(c.req.url);\n baseUrl.searchParams.delete(\"preview\");\n const fullViewUrl = baseUrl.toString();\n\n // Generate HTML\n let html = await generateHTML(events, isPreview, fullViewUrl);\n\n // Translate HTML if language code is provided\n if (lang) {\n console.log(`Translating to language: ${lang}`);\n html = await googleTranslate(html, lang);\n }\n\n return c.html(html);\n } catch (error) {\n return c.text(`Error: ${error.message}`, 500);\n }\n});\n\n// Debug endpoint for raw calendar data\napp.get(\"/debug/raw-calendar\", async (c) => {\n try {\n const calendarUrl = getCalendarUrl();\n\n console.log(\"Fetching raw calendar data from\", calendarUrl);\n\n const response = await fetch(calendarUrl);\n\n if (!response.ok) {\n const errorText = await response.text();\n return c.json({\n error: `Failed to fetch calendar: ${response.status}`,\n details: errorText,\n url: calendarUrl,\n }, 500);\n }\n\n const icalData = await response.text();\n\n return c.text(icalData);\n } catch (error) {\n return c.json({\n error: \"Failed to fetch raw calendar data\",\n details: error.message,\n }, 500);\n }\n});\n\n// Debug endpoint for parsed events\napp.get(\"/debug/parsed-events\", async (c) => {\n try {\n const calendarUrl = getCalendarUrl();\n\n // Calculate date range (yesterday to 2 months from today)\n const now = new Date();\n const yesterday = new Date(now);\n yesterday.setDate(yesterday.getDate() - 1);\n yesterday.setHours(0, 0, 0, 0);\n\n const twoMonthsFromNow = new Date(now);\n twoMonthsFromNow.setMonth(twoMonthsFromNow.getMonth() + 2);\n twoMonthsFromNow.setHours(23, 59, 59, 999);\n\n const response = await fetch(calendarUrl);\n\n if (!response.ok) {\n const errorText = await response.text();\n return c.json({\n error: `Failed to fetch calendar: ${response.status}`,\n details: errorText,\n }, 500);\n }\n\n const icalData = await response.text();\n const events = parseICalEvents(icalData, yesterday, twoMonthsFromNow);\n\n return c.json({\n success: true,\n dateRange: {\n start: yesterday.toISOString(),\n end: twoMonthsFromNow.toISOString(),\n },\n eventCount: events.length,\n events: events,\n timestamp: new Date().toISOString(),\n });\n } catch (error) {\n return c.json({\n error: \"Failed to parse calendar events\",\n details: error.message,\n }, 500);\n }\n});\n\nexport default app.fetch;",[],[87],"92caf617-0d27-47bf-9353-a6103006f8c0","README.md","0f140f26-046a-11f1-b024-42dde27851f2",122,["D",1786657342021],2,"# Calendar Events Display\n\nA Val Town application that fetches and displays Google Calendar events with translation support.\n\n## Structure\n\n```\n├── backend/\n│ └── index.ts # Main Hono app with routes\n├── shared/\n│ └── calendar.ts # Shared calendar parsing and HTML generation\n├── index.ts # Entry point (redirects to backend)\n└── README.md\n```\n\n## Environment Variables\n\n- `GOOGLE_CALENDAR_URL` - The public iCal URL for your Google Calendar\n\n## Endpoints\n\n### Main Application\n- `GET /` - Displays formatted calendar events with translation support\n\n### Debug Endpoints\n- `GET /debug/raw-calendar` - Returns the raw iCal data from Google Calendar\n- `GET /debug/parsed-events` - Returns parsed events in JSON format\n\n## Features\n\n- Fetches events from yesterday to 2 months in the future\n- Displays events in Pacific Time\n- Google Translate integration with URL parameter support (`?lang=es`)\n- Responsive design matching Givebacks style\n- Debug endpoints for troubleshooting calendar data\n\n## Usage\n\n1. Set the `GOOGLE_CALENDAR_URL` environment variable to your public Google Calendar iCal URL\n2. Visit the main endpoint to see formatted events\n3. Use debug endpoints to troubleshoot calendar data issues\n4. 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