dev Graphic Flow Chart | Send Email

[DevCEDTeam]

Conceptual Flow Chart (Text Description)

Here’s the step-by-step conceptual flow of the process involving OAuth 2.0 for Gmail API Authentication and Vertex AI Gemini for generating AI-powered email content:

1. OAuth 2.0 Setup:

   • The user initiates the process by requesting an access token through OAuth 2.0.
   • The system checks if a valid OAuth 2.0 token exists (stored locally).
   • If the token exists and is valid, proceed to email generation.
   • If the token is missing or expired, the user is prompted for authentication, and a new token is stored for future use.

2. AI Email Content Generation:

   • The email body is passed to Vertex AI Gemini.
   • Vertex AI Gemini processes the input and generates the AI-enhanced response or embedding.
   • The AI response is passed back to the system.

3. Email Composition:

   • The system builds an HTML email with the following elements:
     • AI-generated response from Vertex AI Gemini.
     • Tracking Pixel for monitoring email opens.
     • Unsubscribe Link.

4. Sending the Email via Gmail API:

   • The HTML email content is base64-encoded.
   • The email is sent via the Gmail API using the authenticated OAuth 2.0 token.
   • The system logs the message ID and confirms successful delivery.

---

Mermaid Graphic Flow Code

flowchart TD
    A[Start Process] --> B{Check for 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 Email Content with 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 the Email Content]
    I --> J[Send Email via Gmail API]

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

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

---

Explanation of the Flow:

1. OAuth 2.0 Token Check:

   • The process starts by checking if an OAuth token exists and is valid. If it's missing or expired, the user is prompted to authenticate.

2. AI Content Generation:

   • Once authenticated, the system sends the email content to Vertex AI Gemini, which generates AI-enhanced content.

3. HTML Email Construction:

   • The system builds the HTML email, embedding the AI content, tracking pixel, and unsubscribe link.

4. Email Sending via Gmail API:

   • The email is base64-encoded and sent through the Gmail API using the OAuth token.

5. Success Handling:

   • If the email is sent successfully, the message ID is logged. If there’s an error, the system retries or handles the error gracefully.

---

This Mermaid flowchart represents the entire process, providing a clear visual flow from authentication, AI content generation, and email sending, to logging and error handling.