|
| 1 | +import { readFile } from 'node:fs/promises'; |
| 2 | + |
| 3 | +const input = process.argv[2]; |
| 4 | + |
| 5 | +if (!input) { |
| 6 | + throw new Error('Usage: node scripts/validate-calendar.mjs <calendar.ics|URL>'); |
| 7 | +} |
| 8 | + |
| 9 | +const calendar = new URL(input, 'file:').protocol === 'file:' |
| 10 | + ? await readFile(input, 'utf8') |
| 11 | + : await (await fetch(input)).text(); |
| 12 | + |
| 13 | +const errors = []; |
| 14 | +const fail = (message) => errors.push(message); |
| 15 | + |
| 16 | +if (/(^|[^\r])\n/.test(calendar)) { |
| 17 | + fail('Content lines must use CRLF line endings.'); |
| 18 | +} |
| 19 | + |
| 20 | +const lines = calendar.replace(/\r?\n[ \t]/g, '').split(/\r?\n/).filter(Boolean); |
| 21 | +const components = []; |
| 22 | +const events = []; |
| 23 | +const timezones = new Set(); |
| 24 | +const timezoneReferences = new Set(); |
| 25 | +let event; |
| 26 | + |
| 27 | +for (const line of lines) { |
| 28 | + if (line.startsWith('BEGIN:')) { |
| 29 | + const component = line.slice('BEGIN:'.length); |
| 30 | + components.push(component); |
| 31 | + if (component === 'VEVENT') { |
| 32 | + event = new Map(); |
| 33 | + events.push(event); |
| 34 | + } |
| 35 | + continue; |
| 36 | + } |
| 37 | + |
| 38 | + if (line.startsWith('END:')) { |
| 39 | + const component = line.slice('END:'.length); |
| 40 | + if (components.pop() !== component) { |
| 41 | + fail(`Mismatched component terminator: ${line}`); |
| 42 | + } |
| 43 | + if (component === 'VEVENT') { |
| 44 | + event = undefined; |
| 45 | + } |
| 46 | + continue; |
| 47 | + } |
| 48 | + |
| 49 | + const separator = line.indexOf(':'); |
| 50 | + if (separator < 1) { |
| 51 | + fail(`Malformed content line: ${line}`); |
| 52 | + continue; |
| 53 | + } |
| 54 | + |
| 55 | + const declaration = line.slice(0, separator); |
| 56 | + const [name, ...parameters] = declaration.split(';'); |
| 57 | + const value = line.slice(separator + 1); |
| 58 | + |
| 59 | + for (const parameter of parameters) { |
| 60 | + if (parameter.startsWith('TZID=')) { |
| 61 | + timezoneReferences.add(parameter.slice('TZID='.length)); |
| 62 | + } |
| 63 | + } |
| 64 | + |
| 65 | + if (components.at(-1) === 'VTIMEZONE' && name === 'TZID') { |
| 66 | + timezones.add(value); |
| 67 | + } |
| 68 | + |
| 69 | + if (event) { |
| 70 | + event.set(name, [...(event.get(name) ?? []), value]); |
| 71 | + } |
| 72 | +} |
| 73 | + |
| 74 | +if (components.length) { |
| 75 | + fail(`Unclosed component: ${components.at(-1)}`); |
| 76 | +} |
| 77 | + |
| 78 | +if (lines[0] !== 'BEGIN:VCALENDAR' || lines.at(-1) !== 'END:VCALENDAR') { |
| 79 | + fail('Calendar must be wrapped in BEGIN:VCALENDAR and END:VCALENDAR.'); |
| 80 | +} |
| 81 | + |
| 82 | +for (const [index, properties] of events.entries()) { |
| 83 | + for (const property of ['UID', 'DTSTAMP', 'DTSTART']) { |
| 84 | + if (properties.get(property)?.length !== 1) { |
| 85 | + fail(`VEVENT ${index + 1} must contain exactly one ${property}.`); |
| 86 | + } |
| 87 | + } |
| 88 | + |
| 89 | + const uid = properties.get('UID')?.[0]; |
| 90 | + if (uid && events.some((other) => other !== properties && other.get('UID')?.[0] === uid)) { |
| 91 | + fail(`VEVENT ${index + 1} reuses UID ${uid}.`); |
| 92 | + } |
| 93 | +} |
| 94 | + |
| 95 | +for (const timezone of timezoneReferences) { |
| 96 | + if (!timezones.has(timezone)) { |
| 97 | + fail(`TZID=${timezone} has no matching VTIMEZONE component.`); |
| 98 | + } |
| 99 | +} |
| 100 | + |
| 101 | +if (errors.length) { |
| 102 | + throw new Error(`Invalid RFC 5545 calendar:\n- ${errors.join('\n- ')}`); |
| 103 | +} |
| 104 | + |
| 105 | +console.log(`Validated ${events.length} VEVENT components.`); |
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