Function getConditionValue

packages/next-routing/src/matchers.ts:43–76

* Extracts the value for a RouteHas condition from the request context

(
  condition: RouteHas,
  url: URL,
  headers: Headers
)

 * Extracts the value for a RouteHas condition from the request context
 */
function getConditionValue(
  condition: RouteHas,
  url: URL,
  headers: Headers
): string | undefined {
  switch (condition.type) {
    case 'header':
      return headers.get(condition.key) || undefined
    case 'cookie': {
      const cookieHeader = headers.get('cookie')
      if (!cookieHeader) return undefined

      // Parse cookies
      const cookies = cookieHeader.split(';').reduce(
        (acc, cookie) => {
          const [key, ...valueParts] = cookie.trim().split('=')
          if (key) {
            acc[key] = valueParts.join('=')
          }
          return acc
        },
        {} as Record<string, string>
      )

      return cookies[condition.key]
    }
    case 'query':
      return url.searchParams.get(condition.key) || undefined
    case 'host':
      return url.hostname
    default:
      return ''
  }
}

/**
 * Normalizes a capture key to only contain a-zA-Z characters