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* OG (Open Graph) image generation utilities
*/
/**
* Escape special XML characters for safe use in SVG
*/
export function escapeXml(str: string): string {
return str
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """)
.replace(/'/g, "'");
}
/**
* Truncate text to a maximum length with ellipsis
*/
export function truncateText(text: string, maxLength: number): string {
if (text.length <= maxLength) return text;
return `${text.substring(0, maxLength - 1)}…`;
}
/**
* Calculate optimal font size based on text length
* Returns font size in pixels
*/
export function calculateFontSize(
text: string,
maxWidth: number,
baseFontSize: number,
minFontSize: number,
): number {
// Rough approximation: average character width is ~0.6 of font size
const charWidthRatio = 0.6;
const textWidth = text.length * baseFontSize * charWidthRatio;
if (textWidth <= maxWidth) {
return baseFontSize;
}
// Calculate the font size that would fit
const scaledSize = Math.floor(maxWidth / text.length / charWidthRatio);
return Math.max(scaledSize, minFontSize);
}
/**
* Validate hex color format
*/
export function isValidHexColor(color: string): boolean {
return /^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/.test(color);
}
/**
* Lighten a hex color by a percentage
*/
export function lightenColor(hex: string, percent: number): string {
if (!isValidHexColor(hex)) return hex;
// Remove # and expand short form
let color = hex.replace("#", "");
if (color.length === 3) {
color = color
.split("")
.map((c) => c + c)
.join("");
}
const num = Number.parseInt(color, 16);
const r = Math.min(255, Math.floor((num >> 16) + 255 * (percent / 100)));
const g = Math.min(
255,
Math.floor(((num >> 8) & 0x00ff) + 255 * (percent / 100)),
);
const b = Math.min(255, Math.floor((num & 0x0000ff) + 255 * (percent / 100)));
return `#${((r << 16) | (g << 8) | b).toString(16).padStart(6, "0")}`;
}
/**
* Darken a hex color by a percentage
*/
export function darkenColor(hex: string, percent: number): string {
if (!isValidHexColor(hex)) return hex;
// Remove # and expand short form
let color = hex.replace("#", "");
if (color.length === 3) {
color = color
.split("")
.map((c) => c + c)
.join("");
}
const num = Number.parseInt(color, 16);
const r = Math.max(0, Math.floor((num >> 16) * (1 - percent / 100)));
const g = Math.max(
0,
Math.floor(((num >> 8) & 0x00ff) * (1 - percent / 100)),
);
const b = Math.max(0, Math.floor((num & 0x0000ff) * (1 - percent / 100)));
return `#${((r << 16) | (g << 8) | b).toString(16).padStart(6, "0")}`;
}
/**
* OG image configuration interface
*/
export interface OGImageConfig {
title: string;
subtitle: string;
icon: string;
gradient: { from: string; to: string };
}
/**
* Validate OG image configuration
*/
export function isValidOGConfig(config: unknown): config is OGImageConfig {
if (typeof config !== "object" || config === null) return false;
const c = config as Record<string, unknown>;
return (
typeof c.title === "string" &&
c.title.length > 0 &&
typeof c.subtitle === "string" &&
typeof c.icon === "string" &&
typeof c.gradient === "object" &&
c.gradient !== null &&
typeof (c.gradient as Record<string, unknown>).from === "string" &&
typeof (c.gradient as Record<string, unknown>).to === "string"
);
}
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