02-webhook-images.json

{
  "name": "Message487 · 02 · Webhook images",
  "active": false,
  "nodes": [
    {
      "id": "3c2a4ea6-a0fd-55ad-892d-7ebcfd0369c4",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2.1,
      "position": [
        0,
        0
      ],
      "parameters": {
        "httpMethod": "POST",
        "path": "message487/02-webhook-images",
        "authentication": "headerAuth",
        "responseMode": "responseNode",
        "options": {}
      },
      "webhookId": "35f4b9d4-387d-5aec-b10d-7e56171c46f1"
    },
    {
      "id": "2fba2d67-8054-5b2e-9b0d-e986f7842696",
      "name": "Validate event",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        220,
        0
      ],
      "parameters": {
        "jsCode": "const processImages = true;\nconst event = $('Webhook').first().json.body;\nlet reason = '';\nif (!event || event.schema_version !== 1 || typeof event.event_id !== 'string' ||\n    !event.event_id || !['test', 'notification', 'sms'].includes(event.message_type) ||\n    typeof event.text !== 'string') reason = 'Invalid Message487 event';\nconst images = event?.images ?? [];\nif (!Array.isArray(images)) reason = 'images must be an array';\nelse if (processImages && images.some(image => !image || !['image/jpeg', 'image/png'].includes(image.mime_type) ||\n    !Number.isInteger(image.width) || image.width <= 0 || !Number.isInteger(image.height) || image.height <= 0 ||\n    typeof image.data_base64 !== 'string' || !image.data_base64.length ||\n    image.data_base64.length % 4 !== 0 || !/^[A-Za-z0-9+/]*={0,2}$/.test(image.data_base64))) {\n  reason = 'Invalid JPEG/PNG image';\n}\nreturn [{ json: { valid: !reason, reason, event_id: event?.event_id ?? null } }];\n"
      }
    },
    {
      "id": "c57e4445-4585-5ae7-81b2-5a21aff9039a",
      "name": "Valid event",
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        440,
        0
      ],
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "ad1abe2e-40cb-5729-b1e2-5ab82f4422e0",
              "leftValue": "={{ $json.valid }}",
              "rightValue": true,
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      }
    },
    {
      "id": "b427fcc9-ee8b-5648-954e-06e4df3363b4",
      "name": "Reject",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.4,
      "position": [
        640,
        300
      ],
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ { status: \"rejected\", event_id: $json.event_id, reason: $json.reason } }}",
        "options": {
          "responseCode": 400
        }
      }
    },
    {
      "id": "2379636e-be7e-5c90-8784-4fa4e92f3709",
      "name": "Read images",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        640,
        0
      ],
      "parameters": {
        "jsCode": "// The previous validation node checks image metadata and Base64 before this step.\nconst event = $('Webhook').first().json.body;\nconst binary = {};\nconst images = (event.images ?? []).map((image, index) => {\n  const { data_base64, ...metadata } = image;\n  binary[`image${index}`] = { data: data_base64, mimeType: image.mime_type,\n    fileName: `${['avatar', 'app_icon'].includes(image.kind) ? image.kind : 'attachment'}-${index + 1}.${image.mime_type === 'image/png' ? 'png' : 'jpg'}` };\n  return metadata;\n});\nreturn [{ json: { ...event, images, image_count: images.length }, binary }];\n"
      }
    },
    {
      "id": "87c32929-f9c2-5d03-8d5c-47037a71ed3a",
      "name": "Respond",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.4,
      "position": [
        880,
        -200
      ],
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ { status: 'accepted', event_id: $('Webhook').first().json.body.event_id } }}",
        "options": {
          "responseCode": 200
        }
      }
    }
  ],
  "connections": {
    "Webhook": {
      "main": [
        [
          {
            "node": "Validate event",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Validate event": {
      "main": [
        [
          {
            "node": "Valid event",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Valid event": {
      "main": [
        [
          {
            "node": "Read images",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Reject",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Read images": {
      "main": [
        [
          {
            "node": "Respond",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1",
    "timezone": "UTC"
  }
}