Generación de publicaciones virales para Facebook usando Gemini 2.0 e generación de imágenes con IA

• •Cuenta de Google y credenciales de API de Gmail
• •Pueden requerirse credenciales de autenticación para la API de destino
• •Credenciales de API de Google Sheets
• •Credenciales de Graph API de Facebook
• •Clave de API de Google Gemini

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                "value": "={{ $('Format Content').item.json.content }}"
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                "value": "={{ $json.id ? `[{\"media_fbid\":\"${$json.id}\"}]` : \"\" }}"
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              "leftValue": "={{ $json[\"Content\"] ? $json[\"Content\"].length > 0 : (\n    $json[\"message\"]?.text?.length >= 50\n) }}",
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        "functionCode": "const raw =\n  $json[\"Nội dung đầy đủ\"] ||\n  $json.message?.content ||\n  \"\";\n\nconst cleaned = raw.replace(/[#*]+/g, \"\").trim();\n\nreturn [\n  {\n    json: {\n      content: cleaned,\n      platform: \"facebook\",\n    },\n  },\n];"
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            "Ngày": "={{ new Date().toLocaleDateString(\"vi-VN\") }}",
            "Nội dung ngắn": "={{ $('code2').item.json.content }}",
            "Nội dung đầy đủ": "={{ $json.text?.trim() ? $json.text : $json.message?.content }}"
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          "name": "Google Sheets account"
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      "onError": "continueRegularOutput",
      "position": [
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      "parameters": {
        "text": "=You are a marketing content writer. Here is the input content. Do 3 things:\n\n1. Quickly analyze the content.\n\n2. Bullet out the main points to write the article (content marketing or social media post).\n\n3. Return the correct format requested, **no further explanation**, **no additional paragraphs other than the following JSON**.\n\nReturn the result in the following format:\n{\n\"prompt_image\": \"...\",\n\"content\": \"...\"\n}\n\n---\n\"prompt_image\": [write a prompt to create an AI image that matches the content, note: absolutely do not put text in the image, only describe the image and appropriate design style]\n\n\"content\": [write complete, clear, concise, and focused content that can be posted on Facebook, website, or blog]\n\nContent to be processed:\n\"\"\n{{\n$json.message?.text?.trim()\n? $json.message.text\n: $json.content?.trim()\n? $json.content\n: $json['Content']?.trim()\n? $json['Content']\n: \"\"\n}}\n\"\"\"",
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        "text": "=You are a social media content writer. Here is a summary of the content that has been analyzed by AI. Let's turn it into **a complete article**, with the following requirements:\n\n1. **Keep the spirit and main message of the content intact.**\n2. Rewrite it into a coherent article, with a clear introduction - body - conclusion.\n3. Use a **friendly, approachable tone**, easy to understand, suitable for posting on Facebook\n4. Use emojis sparingly to increase attraction (if appropriate).\n5. Keep the length moderate (from 200–350 words).\n6. **Do not insert titles or #hashtags**, just focus on the main content.\n\nHere is the summary:\n\"\"\n{{ $json.content }}\n\"\"\"",
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      "position": [
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      "parameters": {
        "jsCode": "const base64Data = $json.data[0].b64_json;\n\nif (!base64Data) {\n  throw new Error(\"Không tìm thấy dữ liệu ảnh base64.\");\n}\n\nreturn [\n  {\n    json: {},\n    binary: {\n      data: {\n        data: base64Data,\n        mimeType: \"image/png\",\n        fileName: \"image.png\"\n      }\n    }\n  }\n];\n"
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    {
      "id": "6357acfa-99b4-45c8-80e9-65c3fb267071",
      "name": "Google Gemini Modelo de chat",
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        "options": {},
        "modelName": "models/gemini-2.0-flash-001"
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        "jsCode": "let rawText = $json.text || '';\n\n// Bước 1: Tách phần JSON bên trong ```json ... ```\nconst matched = rawText.match(/```json\\s*([\\s\\S]*?)\\s*```/);\n\nif (!matched || !matched[1]) {\n  return [{ json: { prompt_image: '', content: '', error: 'Can not find JSON in ```json```' } }];\n}\n\nlet jsonString = matched[1]\n  .replace(/\\n/g, '')      // Xoá xuống dòng\n  .replace(/\\r/g, '')      // Xoá carriage return\n  .replace(/\\t/g, '')      // Xoá tab (nếu có)\n  .trim();\n\ntry {\n  const parsed = JSON.parse(jsonString);\n  return [{\n    json: {\n      prompt_image: parsed.prompt_image || '',\n      content: parsed.content || ''\n    }\n  }];\n} catch (err) {\n  return [{\n    json: {\n      prompt_image: '',\n      content: '',\n      error: 'error parse JSON: ' + err.message\n    }\n  }];\n}"
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      "name": "HTTP Solicitud",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
        -800,
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      ],
      "parameters": {
        "url": "https://router.huggingface.co/together/v1/images/generations",
        "method": "POST",
        "options": {},
        "jsonBody": "={\n  \"response_format\": \"b64_json\",\n  \"prompt\": \"{{ $json.prompt_image }}\",\n  \"model\": \"black-forest-labs/FLUX.1-schnell\"\n}\n",
        "sendBody": true,
        "sendHeaders": true,
        "specifyBody": "json",
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              "value": "=Bearer <key>"
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              "value": "application/json"
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      "id": "4006af3a-f2e9-45f7-85c5-966c1c82d2e6",
      "name": "Al enviar el formulario1",
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      ],
      "webhookId": "6e9f8a5b-2f3b-4ea5-927d-76a9a34febc9",
      "parameters": {
        "options": {
          "buttonLabel": "Gửi thông tin",
          "appendAttribution": false,
          "respondWithOptions": {
            "values": {
              "formSubmittedText": "Information sent"
            }
          }
        },
        "formTitle": "Input the post idea",
        "formFields": {
          "values": [
            {
              "fieldType": "textarea",
              "fieldLabel": "Input Information here",
              "placeholder": "At least 50 words",
              "requiredField": true
            }
          ]
        },
        "formDescription": "Input the idea that you want upload to Facebook,"
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      "name": "Agregar fila en hoja",
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          "value": {
            "Date": "={{ $now.toFormat(\"dd/MM/yyyy\") }}",
            "Time": "={{ $now.toFormat(\"HH\") }}",
            "Content": "={{ $json[\"Input Information here\"] }}"
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              "id": "Date",
              "type": "string",
              "display": true,
              "removed": false,
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              "defaultMatch": false,
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              "type": "string",
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              "removed": false,
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          "cachedResultUrl": "https://docs.google.com/spreadsheets/d/1icCYSzDhpAc4itXrfwxhjQgisKye-mtdR8UwyZfS1m8/edit?usp=drivesdk",
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          "name": "Google Sheets account"
        }
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      "alwaysOutputData": true
    },
    {
      "id": "0ce21a3e-5ab5-477d-89a9-606ee4e84dfa",
      "name": "Enviar un mensaje",
      "type": "n8n-nodes-base.gmail",
      "position": [
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      ],
      "webhookId": "7f9e790e-fb8d-485a-9c8c-8d592c4cd138",
      "parameters": {
        "sendTo": "truong11062002@gmail.com",
        "message": "=✅ The post will be published after 2 minutes!\n📄 Review in: https://facebook.com/{{ $json.id.split('_')[0] }}/posts/{{ $json.id.split('_')[1] }}",
        "options": {
          "appendAttribution": false
        },
        "subject": "✅ The draft version is uploaded"
      },
      "credentials": {
        "gmailOAuth2": {
          "id": "GkwYsewcP2AJJXFH",
          "name": "Gmail account 2"
        }
      },
      "typeVersion": 2.1
    },
    {
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      "name": "Nota adhesiva",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
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      "parameters": {
        "width": 672,
        "height": 1264,
        "content": "# Complete Setup Guide: AI Facebook Post Generator\n\n## Prerequisites Checklist\n\nBefore starting, ensure you have:\n- [ ] n8n instance (cloud or self-hosted)\n- [ ] Facebook Business Page (not personal profile)\n- [ ] Google account with access to Sheets and Gmail\n- [ ] Basic understanding of API credentials\n\n**Estimated Setup Time**: 30-45 minutes\n\n---\n\n## Step 1: Facebook Integration Setup\n\n### 1.1 Create Facebook App\n1. Go to [Facebook Developers](https://developers.facebook.com/)\n2. Click **\"My Apps\"** → **\"Create App\"**\n3. Choose **\"Business\"** as app type\n4. Enter app name: `n8n-facebook-poster` (or your preferred name)\n5. Click **\"Create App\"**\n\n### 1.2 Configure Facebook App\n1. In your app dashboard, go to **\"Add a Product\"**\n2. Find **\"Facebook Login\"** and click **\"Set Up\"**\n3. Go to **Settings** → **Basic**\n4. Add your domain to **\"App Domains\"** (for n8n cloud: `app.n8n.cloud`)\n5. Save changes\n\n### 1.3 Get Page Access Token\n1. Go to **Tools** → **Graph API Explorer**\n2. Select your app from the dropdown\n3. Click **\"Generate Access Token\"**\n4. Grant permissions: `pages_manage_posts`, `pages_read_engagement`, `pages_show_list`\n5. Select your Facebook page\n6. Copy the **Page Access Token** (starts with `EAAG...`)\n7. **Important**: Extend token to long-lived:\n   - Use Graph API Explorer\n   - Make GET request to: `/oauth/access_token?grant_type=fb_exchange_token&client_id=YOUR_APP_ID&client_secret=YOUR_APP_SECRET&fb_exchange_token=YOUR_SHORT_TOKEN`\n\n### 1.4 Get Your Page ID\n1. Go to your Facebook page\n2. Click **\"About\"** tab\n3. Scroll down to find **\"Page ID\"** or\n4. Use Graph API Explorer: GET request to `/me/accounts` with your token\n\n---"
      },
      "typeVersion": 1
    },
    {
      "id": "2f98cd9a-6ffc-4898-9faa-dd82c220ce65",
      "name": "Nota adhesiva1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
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      "parameters": {
        "color": 3,
        "width": 656,
        "height": 1040,
        "content": "\n## Step 2: Google Services Setup\n\n### 2.1 Enable Google APIs\n1. Go to [Google Cloud Console](https://console.cloud.google.com/)\n2. Create new project or select existing one\n3. Go to **\"APIs & Services\"** → **\"Library\"**\n4. Enable these APIs:\n   - Google Sheets API\n   - Gmail API\n   - Google Drive API (optional)\n\n### 2.2 Create Service Account\n1. Go to **\"APIs & Services\"** → **\"Credentials\"**\n2. Click **\"Create Credentials\"** → **\"Service Account\"**\n3. Name: `n8n-facebook-automation`\n4. Click **\"Create and Continue\"**\n5. Skip role assignment (click **\"Continue\"**)\n6. Click **\"Done\"**\n\n### 2.3 Generate Service Account Key\n1. Click on your service account email\n2. Go to **\"Keys\"** tab\n3. Click **\"Add Key\"** → **\"Create New Key\"**\n4. Choose **\"JSON\"** format\n5. Download the JSON file (save securely)\n\n### 2.4 Prepare Google Sheets\n1. Create two Google Sheets:\n   - **Content Log Sheet**: For tracking generated content\n   - **Input Tracking Sheet**: For logging form submissions\n\n2. **Content Log Sheet Structure**:\n   - Column A: (Date)\n   - Column B: (Short Content)\n   - Column C: (Full Content)\n\n3. **Input Tracking Sheet Structure**:\n   - Column A: \"Date\"\n   - Column B: \"Time\"\n   - Column C: \"Content\"\n\n4. Share both sheets with your service account email (found in the JSON file)\n\n---\n"
      },
      "typeVersion": 1
    },
    {
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      "name": "Nota adhesiva2",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        272,
        -48
      ],
      "parameters": {
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        "content": "\n## Step 3: AI Services Setup\n\n### Get Gemini API Key\n1. Go to [Google AI Studio](https://makersuite.google.com/app/apikey)\n2. Sign in with your Google account\n3. Click **\"Create API Key\"**\n4. Copy the API key (starts with `AIza...`)\n---\n\n## Step 4: n8n Configuration\n\n### 4.1 Import the Workflow\n1. Copy the workflow JSON from the template\n2. In n8n, click **\"Import from JSON\"**\n3. Paste the workflow JSON\n4. Click **\"Import\"**\n\n### 4.2 Configure Credentials\n\n#### Facebook Graph API Credentials\n1. Go to **Settings** → **Credentials**\n2. Click **\"Add Credential\"**\n3. Search for **\"Facebook Graph API\"**\n4. Enter:\n   - **Access Token**: Your Page Access Token from Step 1.3\n5. Test the connection\n6. Save as: `Facebook Page Access`\n\n#### Google Credentials  \n1. Add **\"Google Service Account\"** credential\n2. Upload the JSON file from Step 2.3\n3. Test connection\n4. Save as: `Google Services`\n\n#### Gemini API Credentials\n1. Add **\"Google PaLM API\"** credential\n2. Enter your Gemini API key from Step 3.1\n3. Save as: `Gemini AI`\n\n### 4.3 Update Node Configurations\n\n#### Update Facebook Page ID\n1. Open **\"Facebook Graph API\"** node\n2. Replace `\"113732581629527\"` with your actual Page ID from Step 1.4\n3. Do the same for **\"Facebook Upload Img\"** node\n\n#### Update Google Sheets IDs\n1. Open **\"save content\"** node\n2. Replace the Document ID with your Content Log Sheet ID\n3. Open **\"Append row in sheet\"** node  \n4. Replace the Document ID with your Input Tracking Sheet ID\n\n**To find Sheet ID**: Look at the URL - it's the long string after `/spreadsheets/d/`\n\n#### Update Email Address\n1. Open **\"Send a message\"** node\n2. Replace `xxx@gmail.com` with your email\n3. Configure Gmail credentials if not already done\n\n---\n"
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        "content": "\n## Step 5: Testing & Validation\n\n### 5.1 Test Individual Components\n\n#### Test Google Sheets Connection\n1. Right-click **\"Append row in sheet\"** node\n2. Click **\"Execute Node\"**\n3. Check if a test row appears in your sheet\n\n#### Test Gemini AI\n1. Right-click **\"Basic LLM Chain\"** node\n2. Add test data in **\"Edit Input Data\"**\n3. Execute and verify AI response\n\n#### Test Image Generation\n1. Right-click **\"HTTP Request\"** node\n2. Ensure it has a valid prompt from previous step\n3. Execute and check for base64 image data\n\n#### Test Facebook Upload\n1. Run the full workflow with test content\n2. Check your Facebook page for the post\n3. Verify image uploaded correctly\n\n### 5.2 End-to-End Test\n1. Click **\"Execute Workflow\"** on the trigger node\n2. Submit test content through the form\n3. Monitor each node's execution\n4. Verify final Facebook post"
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