Base64 MCP Server

Instructions

Args:
    encoded: Base64编码的字符串
    output_path: 输出图片的路径
    mime_type: 图片的MIME类型 (默认为image/png)

Returns:
    解码结果

Implementation Reference

• base64_server.py:99-140 (handler)

  The handler function for the 'base64_decode_image' tool. It decodes Base64-encoded image data (supporting data: URLs), creates output directory if needed, and saves the image file.

  @mcp.tool()
  def base64_decode_image(
      encoded: str, output_path: str, mime_type: str = "image/png"
  ) -> str:
      """将Base64编码解码为图片
  
      Args:
          encoded: Base64编码的字符串
          output_path: 输出图片的路径
          mime_type: 图片的MIME类型 (默认为image/png)
  
      Returns:
          解码结果
      """
      try:
          # 清理输入，移除可能的前缀和空白
          encoded = encoded.strip()
  
          # 如果输入是Data URL格式，提取实际的Base64部分
          if encoded.startswith("data:"):
              # 分离MIME类型和Base64内容
              header, encoded = encoded.split(",", 1)
              if ";base64" not in header:
                  return "错误: 输入不是有效的Base64编码的Data URL"
              # 提取MIME类型但不使用，因为我们使用参数中的mime_type
  
          # 解码Base64
          image_data = base64.b64decode(encoded)
  
          # 确保输出目录存在
          output_dir = os.path.dirname(output_path)
          if output_dir and not os.path.exists(output_dir):
              os.makedirs(output_dir)
  
          # 保存图片
          with open(output_path, "wb") as image_file:
              image_file.write(image_data)
  
          return f"图片已成功解码并保存到 {output_path}"
      except Exception as e:
          return f"图片解码失败: {str(e)}"