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export function addLinkCardIfNecessary({
uri,
newText,
cursorLocation,
mayBePaste,
onNewLink,
prevAddedLinks,
}: {
uri: string
newText: string
cursorLocation: number
mayBePaste: boolean
onNewLink: (uri: string) => void
prevAddedLinks: Set<string>
}) {
// It would be cool if we could just use facet.index.byteEnd, but you know... *upside down smiley*
const lastCharacterPosition = findIndexInText(uri, newText) + uri.length
// If the text being added is not from a paste, then we should only check if the cursor is one
// position ahead of the last character. However, if it is a paste we need to check both if it's
// the same position _or_ one position ahead. That is because iOS will add a space after a paste if
// pasting into the middle of a sentence!
const cursorLocationIsOkay =
cursorLocation === lastCharacterPosition + 1 || mayBePaste
// Checking previouslyAddedLinks keeps a card from getting added over and over i.e.
// Link card added -> Remove link card -> Press back space -> Press space -> Link card added -> and so on
// We use the isValidUrl regex below because we don't want to add embeds only if the url is valid, i.e.
// http://facebook is a valid url, but that doesn't mean we want to embed it. We should only embed if
// the url is a valid url _and_ domain. new URL() won't work for this check.
const shouldCheck =
cursorLocationIsOkay && !prevAddedLinks.has(uri) && isValidUrlAndDomain(uri)
if (shouldCheck) {
onNewLink(uri)
prevAddedLinks.add(uri)
}
}
// https://stackoverflow.com/questions/8667070/javascript-regular-expression-to-validate-url
// question credit Muhammad Imran Tariq https://stackoverflow.com/users/420613/muhammad-imran-tariq
// answer credit Christian David https://stackoverflow.com/users/967956/christian-david
function isValidUrlAndDomain(value: string) {
return /^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(
value,
)
}
export function findIndexInText(term: string, text: string) {
// This should find patterns like:
// HELLO SENTENCE http://google.com/ HELLO
// HELLO SENTENCE http://google.com HELLO
// http://google.com/ HELLO.
// http://google.com/.
const pattern = new RegExp(`\\b(${term})(?![/w])`, 'i')
const match = pattern.exec(text)
return match ? match.index : -1
}
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