refactor(functions): Make sure only named exports are used (usernameToColor)

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

src/functions/index.ts

@@ -10,4 +10,4 @@ export * from './emoji/index.ts'
 export * from './isDarkTheme/index.ts'
 export * from './preloadImage/index.ts'
 export * from './reference/index.js'
-export { default as usernameToColor } from './usernameToColor/index.js'
+export { usernameToColor } from './usernameToColor/index.js'

src/functions/usernameToColor/index.js

@@ -3,4 +3,60 @@
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
-export { default } from './usernameToColor.js'
+import { GenColors } from '../../utils/GenColors.js'
+
+import md5 from 'md5'
+
+/**
+ * Generate a color from a username
+ * Originally taken from https://github.com/nextcloud/server/blob/master/core/js/placeholder.js
+ *
+ * @param {string} username Display name or user id to generate from
+ * @return {{ r: number, g: number, b: number }} the RGB color
+ */
+export function usernameToColor(username) {
+	// Normalize hash
+	let hash = username.toLowerCase()
+
+	// Already a md5 hash?
+	if (hash.match(/^([0-9a-f]{4}-?){8}$/) === null) {
+		hash = md5(hash)
+	}
+
+	hash = hash.replace(/[^0-9a-f]/g, '')
+
+	const steps = 6
+	const finalPalette = GenColors(steps)
+
+	/**
+	 * Convert a string to an integer evenly
+	 *
+	 * @param {string} hash The hash to convert
+	 * @param {number} maximum Largest number allowed
+	 */
+	function hashToInt(hash, maximum) {
+		let finalInt = 0
+		const result = []
+
+		// Splitting evenly the string
+		for (let i = 0; i < hash.length; i++) {
+			// chars in md5 goes up to f, hex:16
+			result.push(parseInt(hash.charAt(i), 16) % 16)
+		}
+
+		// Adds up all results
+		for (const j in result) {
+			finalInt += result[j]
+		}
+
+		// chars in md5 goes up to f, hex:16
+		// make sure we're always using int in our operation
+		return parseInt(parseInt(finalInt, 10) % maximum, 10)
+	}
+	return finalPalette[hashToInt(hash, steps * 3)]
+}
+
+/**
+ * @deprecated use the named export of `usernameToColor` instead
+ */
+export default usernameToColor