111 行
2.8 KiB
TypeScript
111 行
2.8 KiB
TypeScript
import type { PostImportSourceIssue } from '@/lib/postImportTypes'
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const MAX_ROWS = 100
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const MAX_URL_BYTES = 20 * 1024
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const truncateUrl = (value: string): string =>
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value.length > 120 ? `${ value.slice (0, 117) }…` : value
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const bytesize = (value: string): number =>
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new TextEncoder ().encode (value).length
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const normaliseImportUrl = (value: string): string | null => {
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const trimmed = value.trim ()
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if (!(trimmed))
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return null
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try
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{
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const url = new URL (trimmed)
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if (!(url.protocol === 'http:' || url.protocol === 'https:'))
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return null
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if (!(url.host))
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return null
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url.hostname = url.hostname.toLowerCase ()
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if (url.pathname.endsWith ('/'))
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url.pathname = url.pathname.replace (/\/+$/, '')
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return url.toString ()
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}
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catch
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{
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return null
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}
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}
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export const countImportSourceLines = (source: string): number =>
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source
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.split (/\r\n|\n|\r/)
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.map (_1 => _1.trim ())
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.filter (_1 => _1 !== '')
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.length
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export const validateImportSource = (
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source: string,
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): PostImportSourceIssue[] => {
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const lines = source.split (/\r\n|\n|\r/)
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const issues: PostImportSourceIssue[] = []
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const seen = new Map<string, number> ()
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let count = 0
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lines.forEach ((rawLine, index) => {
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const value = rawLine.trim ()
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if (!(value))
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return
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++count
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const sourceRow = index + 1
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const displayUrl = truncateUrl (value)
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const normalised = normaliseImportUrl (value)
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if (count > MAX_ROWS)
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{
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issues.push ({
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sourceRow,
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message: `取込件数は ${ MAX_ROWS } 件までです．`,
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url: displayUrl })
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return
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}
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if (!(value.startsWith ('http://') || value.startsWith ('https://')))
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{
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issues.push ({
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sourceRow,
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message: 'HTTP または HTTPS の URL ではありません．',
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url: displayUrl })
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return
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}
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if (bytesize (value) > MAX_URL_BYTES)
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{
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issues.push ({
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sourceRow,
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message: 'URL が長すぎます．',
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url: displayUrl })
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return
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}
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if (normalised == null)
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{
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issues.push ({
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sourceRow,
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message: 'URL の形式が不正です．',
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url: displayUrl })
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return
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}
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const duplicateRow = seen.get (normalised)
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if (duplicateRow != null)
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{
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issues.push ({
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sourceRow,
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message: `${ duplicateRow } 行目と同じ URL です．`,
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url: displayUrl })
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return
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}
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seen.set (normalised, sourceRow)
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})
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return issues
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}
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