dev Graphic Flow Chart | Send OAuth 2.0 Email

As a Gmail Vertex Engineer, I'll provide you with a step-by-step conceptual flow for integrating OAuth 2.0 for Gmail API Authentication and Vertex AI Gemini to generate and send AI-powered email content. After that, I'll write the Mermaid script to visualize the flow, which you can use to generate a graphic chart on GitHub.

Conceptual Flow:

Step 1: OAuth 2.0 Setup and Token Generation

The system initiates an OAuth 2.0 flow to authenticate the app with the Gmail API.
Users are prompted to grant access to send emails through their Gmail account.
After successful authentication, an OAuth token is generated and stored for future use.

Step 2: Initializing Vertex AI Gemini

Once the Gmail API is authenticated, the system initializes the Vertex AI Gemini service.
The AI model is loaded to process and generate email content based on input prompts.
Vertex AI generates dynamic content, which can be personalized based on the recipient or the type of email being sent.

Step 3: Compose and Send Email via Gmail API

The email composition includes:
- The AI-generated content from Vertex AI.
- An embedded tracking pixel to monitor email opens.
- An unsubscribe link to comply with email regulations (e.g., CAN-SPAM).
The system sends the email using the Gmail API with the OAuth 2.0 token.

Step 4: Handling Responses

The system listens for responses such as:
- Tracking pixel requests (indicating email opens).
- Unsubscribe requests (indicating that the user wishes to stop receiving emails).
- Bounce notifications for failed deliveries (handled via a separate bounce management system).

Step 5: Storing Logs and Analytics

Email events like opens, unsubscriptions, and bounces are logged in a database (e.g., MongoDB).
These logs can be used for further analysis and reporting.

Mermaid Script for GitHub Visualization

flowchart TD
    A[Start Process] --> B{Check OAuth 2.0 Token}

    B -- Token Valid --> C[Proceed to Email Generation]
    B -- Token Missing or Expired --> D[Authenticate User and Generate New Token]

    D --> E[Store Token for Future Use] --> C

    C --> F[Generate AI-Powered Email Content via Vertex AI Gemini]
    F --> G[Receive AI Response]

    G --> H[Build HTML Email with AI Response, Tracking Pixel, and Unsubscribe Link]
    H --> I[Base64 Encode Email Content]
    I --> J[Send Email via Gmail API]

    J --> K{Email Sent Successfully?}
    K -- Yes --> L[Log Message ID and Confirm Delivery]
    K -- No --> M[Handle Error and Retry]

    L --> N[End Process]
    M --> N[End Process]

Optimizations Applied:

Steps to Use on GitHub:

Create or open a markdown file (e.g., README.md) in your GitHub repository.
Copy and paste the above Mermaid script into the markdown file.
Commit the changes to the repository.
If Mermaid diagrams are enabled on GitHub, you should be able to view the diagram visually on the repository page.

Explanation of Diagram Components:

OAuth 2.0 Flow: Starts with the initiation of OAuth 2.0 authentication and generation of the token.
Vertex AI Gemini: Handles AI content generation, which feeds into the email composition.
Email Composition and Sending: Uses the Gmail API with the OAuth token, embedding AI content, a tracking pixel, and an unsubscribe link.
Response Handling: Logs email opens, unsubscribe actions, and bounce events.
Analytics and Reporting: Logs are used to analyze campaign performance and generate reports.

This flow ensures a smooth process from authentication to email delivery and tracking, integrating AI-powered content generation and automated event logging.

Let me know if you need further enhancements or steps for deploying this flow!

DevCEDTeam / CED