// Define the workflow
const workflow = {
  "nodes": [
    {
      "id": "upload_image",
      "type": "http",
      "dependencies": [],
      "http": {
        "method": "PUT",
        "url": "https://your-storage-url.com/uploads/{{context.filename}}",
        "headers": {
          "Content-Type": "{{context.contentType}}"
        },
        "body": "{{context.imageData}}"
      }
    },
    {
      "id": "generate_thumbnails",
      "type": "http",
      "dependencies": ["upload_image"],
      "http": {
        "method": "POST",
        "url": "https://your-image-processor.com/process",
        "body": {
          "source": "{{results.upload_image.url}}",
          "operations": [
            { "resize": { "width": 400, "height": 400, "fit": "cover" }},
            { "resize": { "width": 200, "height": 200, "fit": "cover" }}
          ]
        }
      }
    },
    {
      "id": "update_cdn",
      "type": "http",
      "dependencies": ["generate_thumbnails"],
      "http": {
        "method": "POST",
        "url": "https://your-cdn.com/assets",
        "body": {
          "images": "{{results.generate_thumbnails.images}}",
          "metadata": {
            "sizes": ["medium", "small"],
            "contentType": "{{context.contentType}}"
          }
        }
      }
    }
  ]
}

// Execute the workflow
fetch("https://api.graphcompose.io/workflows", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify(workflow)
})