{
  "nodes": [
    {
      "id": "ce7d5310-7170-46d3-b8d8-3f97407f9dfd",
      "name": "Subscribe Form",
      "type": "n8n-nodes-base.formTrigger",
      "position": [
        -600,
        0
      ],
      "parameters": {
        "options": {
          "path": "newsletter-subscriber-enrollment",
          "appendAttribution": false,
          "respondWithOptions": {
            "values": {
              "respondWith": "text",
              "formSubmittedText": "Your subscription was saved and the confirmation email was accepted by Gmail."
            }
          }
        },
        "formTitle": "Learn something every day!",
        "formFields": {
          "values": [
            {
              "fieldType": "textarea",
              "fieldLabel": "topic",
              "placeholder": "What topic(s) would you like to learn about?",
              "requiredField": true
            },
            {
              "fieldType": "email",
              "fieldLabel": "email",
              "placeholder": "eg. jim@example.com",
              "requiredField": true
            },
            {
              "fieldType": "dropdown",
              "fieldLabel": "frequency",
              "fieldOptions": {
                "values": [
                  {
                    "option": "daily"
                  },
                  {
                    "option": "weekly"
                  },
                  {
                    "option": "surprise me"
                  }
                ]
              },
              "requiredField": true
            }
          ]
        },
        "formDescription": "Get a fact a day (or week) about any subject sent to your inbox.",
        "responseMode": "lastNode"
      },
      "typeVersion": 2.2
    },
    {
      "id": "prepare-newsletter-enrollment",
      "name": "Prepare Newsletter Subscription",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        -320,
        0
      ],
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "function prepareNewsletterEnrollment({ body, baseId, tableIdOrName }) {\n  if (!body || typeof body !== 'object' || Array.isArray(body)) throw new Error('Provide a signup object.');\n  const text = (value, label) => {\n    if (typeof value !== 'string' || !value.trim()) throw new Error('Provide ' + label + '.');\n    return value.trim();\n  };\n  const email = text(body.email, 'one email address'), topic = text(body.topic, 'a topic');\n  // The single-address grammar used by HTML email fields; no display names or recipient lists.\n  if (!/^[a-zA-Z0-9.!#$%&'*+\\-/=?^_`{|}~]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?)*$/.test(email)) throw new Error('Provide one email address.');\n  if (email.includes(\"'\")) throw new Error('This template does not support apostrophes in email addresses.');\n  if (!['daily', 'weekly', 'surprise me'].includes(body.frequency)) throw new Error('Choose daily, weekly or surprise me.');\n  baseId = text(baseId, 'your Airtable base ID'); tableIdOrName = text(tableIdOrName, 'your subscribers table ID');\n  if (!/^app[a-zA-Z0-9]+$/.test(baseId) || !/^tbl[a-zA-Z0-9]+$/.test(tableIdOrName)) throw new Error('Configure your own Airtable base and table IDs.');\n  const fields = { Email: email, Topic: topic, Status: 'active', Interval: body.frequency === 'surprise me' ? 'surprise' : body.frequency, 'Start Day': ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'][new Date().getUTCDay()] };\n  return { baseId, tableIdOrName, data: { fields, recipient: email, subject: 'Learn something every day confirmation', message: 'This is to confirm your request to subscribe to \"Learn something every day!\" - a free service to send you facts about your favourite topics.\\n\\nTopic: ' + topic + '\\nSchedule: ' + body.frequency }, endpoint: '/v0/' + baseId + '/' + tableIdOrName, payload: { typecast: false, performUpsert: { fieldsToMergeOn: ['Email'] }, records: [{ fields }] } };\n}\n\nconst settings={\"baseId\":\"YOUR_AIRTABLE_BASE_ID\",\"tableIdOrName\":\"YOUR_SUBSCRIBERS_TABLE_ID\"};\nreturn $input.all().map((item,index)=>({json:prepareNewsletterEnrollment({body:item.json,...settings}),pairedItem:{item:index}}));\n"
      }
    },
    {
      "id": "3611da19-920b-48e6-84a4-f7be0b3a78fc",
      "name": "Create Subscriber",
      "type": "n8n-nodes-base.airtable",
      "position": [
        -40,
        0
      ],
      "parameters": {
        "authentication": "airtableTokenApi",
        "resource": "record",
        "operation": "upsert",
        "base": {
          "__rl": true,
          "mode": "id",
          "value": "={{ $json.baseId }}"
        },
        "table": {
          "__rl": true,
          "mode": "id",
          "value": "={{ $json.tableIdOrName }}"
        },
        "columns": {
          "mappingMode": "defineBelow",
          "value": {
            "Email": "={{ $json.data.fields[\"Email\"] }}",
            "Topic": "={{ $json.data.fields[\"Topic\"] }}",
            "Status": "={{ $json.data.fields[\"Status\"] }}",
            "Interval": "={{ $json.data.fields[\"Interval\"] }}",
            "Start Day": "={{ $json.data.fields[\"Start Day\"] }}"
          },
          "matchingColumns": [
            "Email"
          ],
          "schema": [
            {
              "id": "Email",
              "displayName": "Email",
              "required": false,
              "defaultMatch": true,
              "display": true,
              "type": "string",
              "readOnly": false,
              "removed": false
            },
            {
              "id": "Topic",
              "displayName": "Topic",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "readOnly": false,
              "removed": false
            },
            {
              "id": "Status",
              "displayName": "Status",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "readOnly": false,
              "removed": false
            },
            {
              "id": "Interval",
              "displayName": "Interval",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "readOnly": false,
              "removed": false
            },
            {
              "id": "Start Day",
              "displayName": "Start Day",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "readOnly": false,
              "removed": false
            }
          ],
          "attemptToConvertTypes": false,
          "convertFieldsToString": false
        },
        "options": {
          "typecast": false,
          "updateAllMatches": false
        }
      },
      "typeVersion": 2.1,
      "alwaysOutputData": true
    },
    {
      "id": "verify-newsletter-enrollment",
      "name": "Verify Saved Subscriber",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        240,
        0
      ],
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "function verifyNewsletterSubscriber({ records, data, expectedId }) {\n  if (!Array.isArray(records) || records.length !== 1) throw new Error('Airtable did not confirm one saved subscriber.');\n  const record = records[0];\n  if (!record || typeof record.id !== 'string' || !/^rec[a-zA-Z0-9]+$/.test(record.id) || (expectedId && record.id !== expectedId) || !record.fields || Object.entries(data.fields).some(([key, value]) => record.fields[key] !== value)) throw new Error('Airtable did not confirm the saved subscription fields.');\n  return { recipient: data.recipient, subject: data.subject, message: data.message };\n}\n\nconst savedItems=$input.all();\nif(savedItems.length!==$('Prepare Newsletter Subscription').all().length) throw new Error('Airtable did not confirm one saved subscriber per signup.');\nreturn savedItems.map((item,index)=>({json:verifyNewsletterSubscriber({records:[item.json],data:$('Prepare Newsletter Subscription').itemMatching(index).json.data,expectedId:''}),pairedItem:{item:index}}));\n"
      }
    },
    {
      "id": "1ea47e14-0a28-4780-95c7-31e24eb724d5",
      "name": "Send Subscription Confirmation",
      "type": "n8n-nodes-base.gmail",
      "position": [
        520,
        0
      ],
      "parameters": {
        "resource": "message",
        "operation": "send",
        "sendTo": "={{ $json.recipient }}",
        "subject": "={{ $json.subject }}",
        "emailType": "text",
        "message": "={{ $json.message }}",
        "options": {
          "appendAttribution": false
        }
      },
      "typeVersion": 2.1,
      "alwaysOutputData": true
    },
    {
      "id": "confirm-newsletter-enrollment",
      "name": "Confirm Email Acceptance",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        800,
        0
      ],
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "function confirmNewsletterEnrollment({ messageId }) {\n  if (typeof messageId !== 'string' || !messageId.trim()) throw new Error('Gmail did not confirm acceptance of the confirmation email.');\n  return { body: { subscribed: true, confirmationAccepted: true } };\n}\n\nreturn $input.all().map((item,index)=>({json:confirmNewsletterEnrollment({messageId:item.json.id}),pairedItem:{item:index}}));\n"
      }
    }
  ],
  "pinData": {},
  "connections": {
    "Subscribe Form": {
      "main": [
        [
          {
            "node": "Prepare Newsletter Subscription",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Prepare Newsletter Subscription": {
      "main": [
        [
          {
            "node": "Create Subscriber",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Create Subscriber": {
      "main": [
        [
          {
            "node": "Verify Saved Subscriber",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Verify Saved Subscriber": {
      "main": [
        [
          {
            "node": "Send Subscription Confirmation",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Send Subscription Confirmation": {
      "main": [
        [
          {
            "node": "Confirm Email Acceptance",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "name": "Newsletter Subscriber Enrollment",
  "active": false
}