cal.pub0.org/packages/lib/getBrandColours.tsx

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import { useBrandColors } from "@calcom/embed-core/embed-iframe";
const BRAND_COLOR = "#292929";
const DARK_BRAND_COLOR = "#fafafa";
type Rgb = {
r: number;
g: number;
b: number;
};
/**
* Given a html color name, check if it exists in our color palette
* and if it does, return the hex code for that color. Otherwise,
* return the default brand color.
*/
export function fallBackHex(val: string | null, dark: boolean): string {
if (val && isValidHexCode(val)) {
return val;
}
return dark ? DARK_BRAND_COLOR : BRAND_COLOR;
}
export function isValidHexCode(hexColor: string): boolean {
// Regular expression for hex color code pattern
const hexColorPattern = /^#([0-9A-Fa-f]{3}){1,2}$/;
// Check if hex color code matches pattern
const isHexColor = hexColorPattern.test(hexColor);
return isHexColor;
}
function hexToRgb(hex: string): Rgb {
const sanitizedHex = hex.replace("##", "#");
const colorParts = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(sanitizedHex);
if (!colorParts) {
throw new Error("Invalid Hex colour");
}
const [, r, g, b] = colorParts;
return {
r: parseInt(r, 16),
g: parseInt(g, 16),
b: parseInt(b, 16),
} as Rgb;
}
function rgbToHex(r: number, g: number, b: number): string {
const toHex = (c: number) => `0${c.toString(16)}`.slice(-2);
return `#${toHex(r)}${toHex(g)}${toHex(b)}`;
}
function lighten(hex: string, intensity: number): string {
const color = hexToRgb(`#${hex}`);
if (!color) {
return "";
}
const r = Math.round(color.r + (255 - color.r) * intensity);
const g = Math.round(color.g + (255 - color.g) * intensity);
const b = Math.round(color.b + (255 - color.b) * intensity);
return rgbToHex(r, g, b);
}
function darken(hex: string, intensity: number): string {
const color = hexToRgb(hex);
if (!color) {
return "";
}
const r = Math.round(color.r * intensity);
const g = Math.round(color.g * intensity);
const b = Math.round(color.b * intensity);
return rgbToHex(r, g, b);
}
function normalizeHexCode(hex: string | null, dark: boolean) {
if (!hex) {
return !dark ? BRAND_COLOR : DARK_BRAND_COLOR;
}
hex = hex.replace("#", "");
// If the length of the hex code is 3, double up each character
// e.g. fff => ffffff or a0e => aa00ee
if (hex.length === 3) {
hex = hex
.split("")
.map(function (hex) {
return hex + hex;
})
.join("");
}
return hex;
}
export const createColorMap = (brandColor: string) => {
const response: Record<string, string> = {
500: `#${brandColor}`.replace("##", "#"),
};
const intensityMap: {
[key: number]: number;
} = {
50: 0.95,
100: 0.9,
200: 0.75,
300: 0.6,
400: 0.3,
600: 0.9,
700: 0.75,
800: 0.6,
900: 0.49,
};
[50, 100, 200, 300, 400].forEach((level) => {
response[level] = lighten(brandColor, intensityMap[level]);
});
[600, 700, 800, 900].forEach((level) => {
response[level] = darken(brandColor, intensityMap[level]);
});
return response;
};
function getWCAGContrastColor(background: string): string {
// Convert the hex background color to RGB
const { r, g, b } = hexToRgb(background);
// Calculate the luminance of the background color
const luminance = (0.2126 * r + 0.7152 * g + 0.0722 * b) / 255;
// If the luminance is less than 0.5, use white as the text color, otherwise use black
return luminance < 0.5 ? "#FFFFFF" : "#000000";
}
export function checkWCAGContrastColor(background: string, target: string) {
const backgroundRGB = hexToRgb(background);
const targetRGB = hexToRgb(target);
const bgLuminance = (0.2126 * backgroundRGB.r + 0.7152 * backgroundRGB.g + 0.0722 * backgroundRGB.b) / 255;
const targetLuminance = (0.2126 * targetRGB.r + 0.7152 * targetRGB.g + 0.0722 * targetRGB.b) / 255;
const contrastRadio =
(Math.max(bgLuminance, targetLuminance) + 0.05) / (Math.min(targetLuminance, bgLuminance) + 0.05);
const MIN_CONTRAST_RATIO = 4.5; // used for BGs
return contrastRadio >= MIN_CONTRAST_RATIO;
}
/**
* Given a light and dark brand color value, update the css variables
* within the document to reflect the new brand colors.
*/
const useGetBrandingColours = ({
lightVal = BRAND_COLOR,
darkVal = DARK_BRAND_COLOR,
}: {
lightVal: string | undefined | null;
darkVal: string | undefined | null;
}) => {
const embedBrandingColors = useBrandColors();
lightVal = embedBrandingColors.brandColor || lightVal;
// convert to 6 digit equivalent if 3 digit code is entered
lightVal = normalizeHexCode(lightVal, false);
darkVal = normalizeHexCode(darkVal, true);
const lightColourMap = createColorMap(lightVal);
const darkColourMap = createColorMap(darkVal);
const theme = {
light: {
"cal-brand": lightColourMap["500"],
"cal-brand-emphasis": lightColourMap["400"],
"cal-brand-subtle": lightColourMap["200"],
"cal-brand-text": getWCAGContrastColor(lightColourMap["500"]),
"cal-brand-accent": getWCAGContrastColor(lightColourMap["500"]),
},
dark: {
"cal-brand": darkColourMap["500"],
"cal-brand-emphasis": darkColourMap["600"],
"cal-brand-subtle": darkColourMap["800"],
"cal-brand-text": getWCAGContrastColor(darkColourMap["500"]),
"cal-brand-accent": getWCAGContrastColor(darkColourMap["500"]),
},
};
return theme;
};
export default useGetBrandingColours;