Function toDataUri

src/utils/image.ts:26–48

(image: string)

const MAX_IMAGE_SIZE_BYTES = 50 * 1024 * 1024;

export async function toDataUri(image: string): Promise<string> {
  if (image.startsWith('data:')) return image;

  if (image.startsWith('http://') || image.startsWith('https://')) {
    const res = await fetch(image);
    if (!res.ok) throw new CLIError(`Failed to download image: HTTP ${res.status}`, ExitCode.GENERAL);
    const contentType = res.headers.get('content-type') || 'image/jpeg';
    const mime = contentType.split(';')[0]!.trim();
    const buf = await res.arrayBuffer();
    if (buf.byteLength > MAX_IMAGE_SIZE_BYTES) {
      throw new CLIError(
        `Image too large (${(buf.byteLength / 1024 / 1024).toFixed(1)} MB). Maximum is 50 MB.`,
        ExitCode.USAGE,
      );
    }
    return `data:${mime};base64,${Buffer.from(buf).toString('base64')}`;
  }

  if (!existsSync(image)) throw new CLIError(`File not found: ${image}`, ExitCode.USAGE);
  const ext = extname(image).toLowerCase();
  if (!IMAGE_MIME_TYPES[ext]) throw new CLIError(`Unsupported image format "${ext}". Supported: jpg, jpeg, png, webp`, ExitCode.USAGE);
  return localFileToDataUri(image);
}