feat: add set custom primary colors method in initialize flow

src/config.js

@@ -171,6 +171,7 @@ let config = {
   MFE_CONFIG_API_URL: process.env.MFE_CONFIG_API_URL,
   APP_ID: process.env.APP_ID,
   SUPPORT_URL: process.env.SUPPORT_URL,
+  CUSTOM_PRIMARY_COLORS: process.env.CUSTOM_PRIMARY_COLORS || {},
 };
 
 /**
@@ -325,4 +326,5 @@ export function ensureConfig(keys, requester = 'unspecified application code') {
  * @property {string} APP_ID
  * @property {string} SUPPORT_URL
  * @property {string} PARAGON_THEME_URLS
+ * @property {Object} CUSTOM_PRIMARY_COLORS
  */

src/constants.js

@@ -64,3 +64,17 @@ export const APP_INIT_ERROR = `${APP_TOPIC}.INIT_ERROR`;
 export const CONFIG_TOPIC = 'CONFIG';
 
 export const CONFIG_CHANGED = `${CONFIG_TOPIC}.CHANGED`;
+
+export const PRIMARY_COLOR_DEFINITIONS = {
+  'pgn-color-primary-100': { '#FFFFFF': 94 },
+  'pgn-color-primary-200': { '#FFFFFF': 75 },
+  'pgn-color-primary-300': { '#FFFFFF': 50 },
+  'pgn-color-primary-400': { '#FFFFFF': 25 },
+  'pgn-color-primary-500': { '#FFFFFF': 0 },
+  'pgn-color-primary-600': { '#000000': 10 },
+  'pgn-color-primary-700': { '#000000': 20 },
+  'pgn-color-primary-800': { '#000000': 25 },
+  'pgn-color-primary-900': { '#000000': 30 },
+  'pgn-color-link-base': { '#FFFFFF': 35 },
+  'pgn-color-link-hover': { '#FFFFFF': 0 },
+};

src/index.js

@@ -7,6 +7,7 @@ export {
   ensureDefinedConfig,
   parseURL,
   getPath,
+  mix,
 } from './utils';
 export {
   APP_TOPIC,

src/initialize.js

@@ -54,7 +54,7 @@ Note that the env.config.js file in frontend-platform's root directory is NOT us
 initialization code, it's just there for the test suite and example application.
 */
 import envConfig from 'env.config'; // eslint-disable-line import/no-unresolved
-import { getPath } from './utils';
+import { getPath, mix } from './utils';
 import {
   publish,
 } from './pubSub';
@@ -87,6 +87,7 @@ import {
   APP_LOGGING_INITIALIZED,
   APP_ANALYTICS_INITIALIZED,
   APP_READY, APP_INIT_ERROR,
+  PRIMARY_COLOR_DEFINITIONS,
 } from './constants';
 import configureCache from './auth/LocalForageCache';
 
@@ -205,6 +206,41 @@ export function loadExternalScripts(externalScripts, data) {
   });
 }
 
+/*
+ * Set custom colors based on the config content.
+ * This method allows to change primary colors and its levels on runtime,
+ * if a specific level is already in the configuration that level will have
+ * priority otherwise the level will be calculated based on primary color by
+ * using the mix function.
+ */
+export function setCustomPrimaryColors() {
+  const { CUSTOM_PRIMARY_COLORS } = getConfig();
+  const primary = CUSTOM_PRIMARY_COLORS['pgn-color-primary-base'];
+
+  if (!primary) {
+    return;
+  }
+  document.documentElement.style.setProperty('--pgn-color-primary-base', primary);
+
+  Object.keys(PRIMARY_COLOR_DEFINITIONS).forEach((key) => {
+    let color;
+
+    if (key in CUSTOM_PRIMARY_COLORS) {
+      color = CUSTOM_PRIMARY_COLORS[key];
+    } else {
+      try {
+        const [base, weight] = Object.entries(PRIMARY_COLOR_DEFINITIONS[key])[0];
+
+        color = mix(base, primary, weight);
+      } catch (error) {
+        // eslint-disable-next-line no-console
+        console.error('Error setting custom colors', error.message);
+      }
+    }
+    document.documentElement.style.setProperty('--'.concat(key), color);
+  });
+}
+
 /**
  * The default handler for the initialization lifecycle's `analytics` phase.
  *
@@ -306,6 +342,7 @@ export async function initialize({
     await handlers.config();
     await jsFileConfig();
     await runtimeConfig();
+    setCustomPrimaryColors();
     publish(APP_CONFIG_INITIALIZED);
 
     loadExternalScripts(externalScripts, {

src/initialize.test.js

@@ -352,6 +352,91 @@ describe('initialize', () => {
     expect(hydrateAuthenticatedUser).not.toHaveBeenCalled();
     expect(logError).not.toHaveBeenCalled();
   });
+
+  it('should not set any color', async () => {
+    const messages = { i_am: 'a message' };
+    await initialize({
+      messages,
+    });
+
+    // eslint-disable-next-line no-underscore-dangle
+    expect(document.documentElement.style._values).toEqual({});
+    expect(logError).not.toHaveBeenCalled();
+  });
+
+  it('should set primary color and calculate its levels', async () => {
+    config.CUSTOM_PRIMARY_COLORS = { 'pgn-color-primary-base': '#A000000' };
+    const messages = { i_am: 'a message' };
+    const expectedKeys = [
+      '--pgn-color-primary-base',
+      '--pgn-color-primary-100',
+      '--pgn-color-primary-200',
+      '--pgn-color-primary-300',
+      '--pgn-color-primary-400',
+      '--pgn-color-primary-500',
+      '--pgn-color-primary-600',
+      '--pgn-color-primary-700',
+      '--pgn-color-primary-800',
+      '--pgn-color-primary-900',
+      '--pgn-color-link-base',
+      '--pgn-color-link-hover',
+    ];
+
+    await initialize({
+      messages,
+    });
+
+    // eslint-disable-next-line no-underscore-dangle
+    expect(Object.keys(document.documentElement.style._values)).toEqual(expectedKeys);
+    expect(logError).not.toHaveBeenCalled();
+  });
+
+  it('should set primary color and its levels from config', async () => {
+    config.CUSTOM_PRIMARY_COLORS = {
+      'pgn-color-primary-base': '#A000000',
+      'pgn-color-primary-100': '#A001000',
+      'pgn-color-primary-200': '#A000000',
+      'pgn-color-primary-300': '#A045000',
+      'pgn-color-primary-400': '#A07AB00',
+      'pgn-color-primary-500': '#A000B12',
+      'pgn-color-primary-600': '#A087400',
+      'pgn-color-primary-700': '#A0abc00',
+      'pgn-color-primary-800': '#AABCFA0',
+      'pgn-color-primary-900': '#A014200',
+      'pgn-color-link-base': '#FF0056',
+      'pgn-color-link-hover': '#AFFCDA',
+    };
+    const messages = { i_am: 'a message' };
+
+    await initialize({
+      messages,
+    });
+
+    // eslint-disable-next-line no-underscore-dangle
+    expect(Object.values(document.documentElement.style._values)).toEqual(Object.values(config.CUSTOM_PRIMARY_COLORS));
+    expect(logError).not.toHaveBeenCalled();
+  });
+  it('should log error when color is invalid', async () => {
+    // eslint-disable-next-line no-console
+    console.error = jest.fn();
+    configureCache.mockReturnValueOnce(Promise.resolve({
+      get: (url) => {
+        const params = new URL(url).search;
+        const mfe = new URLSearchParams(params).get('mfe');
+        return ({ data: { ...newConfig.common, ...newConfig[mfe] } });
+      },
+    }));
+    config.CUSTOM_PRIMARY_COLORS = { 'pgn-color-primary-base': '#AB' };
+    const messages = { i_am: 'a message' };
+
+    await initialize({
+      messages,
+    });
+
+    // eslint-disable-next-line no-console
+    expect(console.error).toHaveBeenNthCalledWith(9, 'Error setting custom colors', 'Parameter color does not have format #RRGGBB');
+    expect(logError).not.toHaveBeenCalled();
+  });
 });
 
 describe('history', () => {

src/utils.js

@@ -201,3 +201,37 @@ export function ensureDefinedConfig(object, requester) {
     }
   });
 }
+
+/**
+ * This function is the javascript version of SASS mix() function,
+ * https://sass-lang.com/documentation/modules/color#mix
+ *
+ * @param {string} First color in hexadecimal.
+ * @param {string} Second color in hexadecimal.
+ * @param {number} Relative opacity of each color.
+ * @returns {string} Returns a color that’s a mixture of color1 and color2.
+ */
+export function mix(color1, color2, weight = 50) {
+  let color = '#';
+
+  function d2h(d) { return d.toString(16); } // convert a decimal value to hex
+  function h2d(h) { return parseInt(h, 16); } // convert a hex value to decimal
+
+  if (color1.length < 6 || color2.length < 6) {
+    throw new Error('Parameter color does not have format #RRGGBB');
+  }
+
+  for (let i = 0; i <= 5; i += 2) { // loop through each of the 3 hex pairs—red, green, and blue
+    const v1 = h2d(color1.replace('#', '').substr(i, 2));
+    const v2 = h2d(color2.replace('#', '').substr(i, 2));
+    let val = d2h(Math.round(v2 + (v1 - v2) * (weight / 100.0)));
+
+    while (val.length < 2) {
+      val = '0'.concat(val);
+    }
+
+    color += val;
+  }
+
+  return color;
+}

src/utils.test.js

@@ -6,6 +6,7 @@ import {
   parseURL,
   getPath,
   getQueryParameters,
+  mix,
 } from '.';
 
 describe('modifyObjectKeys', () => {
@@ -207,3 +208,21 @@ describe('getPath', () => {
     expect(getPath(testURL)).toEqual('/learning/');
   });
 });
+
+describe('mix', () => {
+  it('should return rigth value', () => {
+    const expected = '#546e88'; // This value was calculated in https://sass.js.org/ by using sass mix function
+
+    expect(mix('#FFFFFF', '#0A3055', 30)).toBe(expected);
+  });
+
+  it('should thow error', () => {
+    expect(() => mix('#FFFFFF', '#0A3')).toThrow('Parameter color does not have format #RRGGBB');
+  });
+
+  it('should return rigth value without hash symbol on parameters', () => {
+    const expected = '#8598aa'; // This value was calculated in https://sass.js.org/ by using sass mix function
+
+    expect(mix('FFFFFF', '0A3055')).toBe(expected);
+  });
+});