react-native-ui-lib/src/helpers/AvatarHelper.js

<p align="center"> <img src="https://user-images.githubusercontent.com/1780255/105469025-56759000-5ca0-11eb-993d-3568c1fd54f4.png" height="250px" style="display:block"/> </p> <p align="center">UI Toolset & Components Library for React Native</p> <p a

import _ from 'lodash';
import URL from 'url-parse';
import Colors from "../style/colors";
export function hashStringToNumber(str) {
  let hash = 5381;

  for (let i = 0; i < str.length; i++) {
    const char = str.charCodeAt(i);
    hash = (hash << 5) + hash + char;
    /* hash * 33 + c */
    // eslint-disable-line
  }

  return hash;
}
export function getAvatarColors() {
  return [Colors.blue20, Colors.cyan20, Colors.green20, Colors.yellow20, Colors.orange20, Colors.red20, Colors.purple20, Colors.violet20];
}
export function getColorById(id, avatarColors = getAvatarColors()) {
  if (!id) {
    return avatarColors[0];
  }

  const hashedId = hashStringToNumber(id);
  const colorIndex = Math.abs(hashedId % avatarColors.length);
  return avatarColors[colorIndex];
}
export function getInitials(name, limit = 2) {
  let initials = '';

  if (name && _.isString(name)) {
    const nameSplitted = _.chain(name).split(/\s+/g).filter(word => word.length > 0).take(limit).value();

    _.each(nameSplitted, str => {
      initials += str[0];
    });
  }

  return _.toUpper(initials);
}
export function getBackgroundColor(name, avatarColors, hashFunction, defaultColor) {
  if (!name || !avatarColors || !hashFunction) {
    return defaultColor;
  }

  const hash = hashFunction(name);
  const index = Math.abs(hash % avatarColors.length);
  return avatarColors[index];
}
export function isGravatarUrl(url) {
  const {
    hostname,
    pathname
  } = new URL(url);
  return _.split(hostname, '.').includes('gravatar') && pathname.startsWith('/avatar/');
}
export function isBlankGravatarUrl(url) {
  return isGravatarUrl(url) && _.endsWith(url, '?d=blank');
}
export function patchGravatarUrl(gravatarUrl) {
  const url = new URL(gravatarUrl, true);
  const {
    query
  } = url;
  query.d = '404';
  delete query.default;
  url.set('query', query);
  return url.toString();
}