Function createFileContentFromBase64

apps/sim/lib/uploads/utils/file-utils.ts:157–191

(
  base64: string,
  mimeType: string
)

 * Create message content from base64-encoded file data.
 */
export function createFileContentFromBase64(
  base64: string,
  mimeType: string
): MessageContent | null {
  // SVG is XML text — Claude only supports raster image formats (JPEG, PNG, GIF, WebP),
  // so send SVGs as an XML document instead
  if (mimeType.toLowerCase() === 'image/svg+xml') {
    return {
      type: 'document',
      source: {
        type: 'base64',
        media_type: 'text/xml',
        data: base64,
      },
    }
  }

  const contentType = getContentType(mimeType)
  if (!contentType) {
    return null
  }

  if (contentType === 'image' && !MODEL_SUPPORTED_IMAGE_MIME_TYPES.has(mimeType.toLowerCase())) {
    return null
  }

  return {
    type: contentType,
    source: {
      type: 'base64',
      media_type: mimeType,
      data: base64,
    },
  }
}

export const MODEL_SUPPORTED_IMAGE_MIME_TYPES = new Set([
  'image/jpeg',