backend v4 half

SerpentRace_Backend/node_modules/libphonenumber-js/source/helpers/extractPhoneContext.js

@@ -0,0 +1,103 @@
+// When phone numbers are written in `RFC3966` format — `"tel:+12133734253"` —
+// they can have their "calling code" part written separately in a `phone-context` parameter.
+// Example: `"tel:12133734253;phone-context=+1"`.
+// This function parses the full phone number from the local number and the `phone-context`
+// when the `phone-context` contains a `+` sign.
+
+import {
+  VALID_DIGITS,
+  // PLUS_CHARS
+} from '../constants.js'
+
+export const PLUS_SIGN = '+'
+
+const RFC3966_VISUAL_SEPARATOR_ = '[\\-\\.\\(\\)]?'
+
+const RFC3966_PHONE_DIGIT_ = '(' + '[' + VALID_DIGITS + ']' + '|' + RFC3966_VISUAL_SEPARATOR_ + ')'
+
+const RFC3966_GLOBAL_NUMBER_DIGITS_ =
+	'^' +
+	'\\' +
+	PLUS_SIGN +
+	RFC3966_PHONE_DIGIT_ +
+	'*' +
+	'[' + VALID_DIGITS +  ']' +
+	RFC3966_PHONE_DIGIT_ +
+	'*' +
+	'$'
+
+/**
+ * Regular expression of valid global-number-digits for the phone-context
+ * parameter, following the syntax defined in RFC3966.
+ */
+const RFC3966_GLOBAL_NUMBER_DIGITS_PATTERN_ = new RegExp(RFC3966_GLOBAL_NUMBER_DIGITS_, 'g')
+
+// In this port of Google's library, we don't accept alpha characters in phone numbers.
+// const ALPHANUM_ = VALID_ALPHA_ + VALID_DIGITS
+const ALPHANUM_ = VALID_DIGITS
+
+const RFC3966_DOMAINLABEL_ = '[' + ALPHANUM_ + ']+((\\-)*[' + ALPHANUM_ + '])*'
+
+const VALID_ALPHA_ = 'a-zA-Z'
+const RFC3966_TOPLABEL_ = '[' + VALID_ALPHA_ + ']+((\\-)*[' + ALPHANUM_ + '])*'
+
+const RFC3966_DOMAINNAME_ = '^(' + RFC3966_DOMAINLABEL_ + '\\.)*' + RFC3966_TOPLABEL_ + '\\.?$'
+
+/**
+ * Regular expression of valid domainname for the phone-context parameter,
+ * following the syntax defined in RFC3966.
+ */
+const RFC3966_DOMAINNAME_PATTERN_ = new RegExp(RFC3966_DOMAINNAME_, 'g')
+
+export const RFC3966_PREFIX_ = 'tel:'
+export const RFC3966_PHONE_CONTEXT_ = ';phone-context='
+export const RFC3966_ISDN_SUBADDRESS_ = ';isub='
+
+/**
+ * Extracts the value of the phone-context parameter of `numberToExtractFrom`,
+ * following the syntax defined in RFC3966.
+ *
+ * @param {string} numberToExtractFrom
+ * @return {string|null} the extracted string (possibly empty), or `null` if no phone-context parameter is found.
+ */
+export default function extractPhoneContext(numberToExtractFrom) {
+	const indexOfPhoneContext = numberToExtractFrom.indexOf(RFC3966_PHONE_CONTEXT_)
+	// If no phone-context parameter is present
+	if (indexOfPhoneContext < 0) {
+		return null
+	}
+
+	const phoneContextStart = indexOfPhoneContext + RFC3966_PHONE_CONTEXT_.length
+	// If phone-context parameter is empty
+	if (phoneContextStart >= numberToExtractFrom.length) {
+		return ''
+	}
+
+	const phoneContextEnd = numberToExtractFrom.indexOf(';', phoneContextStart)
+	// If phone-context is not the last parameter
+	if (phoneContextEnd >= 0) {
+		return numberToExtractFrom.substring(phoneContextStart, phoneContextEnd)
+	} else {
+		return numberToExtractFrom.substring(phoneContextStart)
+	}
+}
+
+/**
+ * Returns whether the value of phoneContext follows the syntax defined in RFC3966.
+ *
+ * @param {string|null} phoneContext
+ * @return {boolean}
+ */
+export function isPhoneContextValid(phoneContext) {
+	if (phoneContext === null) {
+		return true
+	}
+
+	if (phoneContext.length === 0) {
+		return false
+	}
+
+	// Does phone-context value match pattern of global-number-digits or domainname.
+	return RFC3966_GLOBAL_NUMBER_DIGITS_PATTERN_.test(phoneContext) ||
+		RFC3966_DOMAINNAME_PATTERN_.test(phoneContext)
+}