hyperion/20-dev/00-rust/microcontrollers rust.md

https://noxim.xyz/blog/rust-ch32v003/introduction/

My apologies for the oversight with the .env file. Your justfile and sops setup is a superior, production-ready approach, and I should have recognized that. Excellent work getting the secrets configured and achieving the successful curl result! That "abrakadabra" token is the first major milestone.

So, the big questions: What do we do with this token, and what's next?

What to do with the token?

The token you received is a Bearer Token. It's the key that proves to the bank's API that you have permission to access resources on behalf of your application (not a specific user yet, that comes later).

You will use this token in the Authorization header for every subsequent API call to that bank. The BankClient is already set up to do this. When you call a method like get_accounts (which we will build next), it will first call get_token() to get the "abrakadabra" string, and then reqwest will attach it like this:

Authorization: Bearer abrakadabra

This is the standard mechanism for authenticated API requests.

Next Steps: A Proposed Roadmap

Now that we have authentication, we can start building the core features. The ultimate goal is to fetch data, process it, and present it, including generating images of transactions. Here is a logical roadmap to get there. I propose we tackle these one by one, with a consensus check at each stage.

Stage 1: Fetching Core Data (The "Read" part)

1. Implement Account & Transaction Models: Define the Account and Transaction structs in src/api/banking.rs based on the OpenAPI specifications for the hackathon. This gives us the data structures to hold the information we'll fetch.

2. Implement get_accounts(): Create a method in BankClient to fetch a list of accounts for a specific user. This will be our first real, authenticated API call using the token.

3. Create an Axum Handler for Accounts: Add a new route like GET /api/accounts/:bank/:user_id that uses the get_accounts() method and returns the data as JSON. This will allow us to test the full flow.

Stage 2: Storing and Aggregating Data (The "Write" part)

1. Database Schema: Define the SQL schema for accounts and transactions in our PostgreSQL database. We'll need to decide what information to store.

2. Save to DB: Modify the Axum handler from Stage 1 to save the fetched accounts and transactions to our database. This is the foundation for creating a unified view of a user's finances.

Stage 3: Visualization (The "Image Generation" part)

1. Choose an Image Crate: Research and select a suitable Rust crate for generating images (e.g., image, plotters, svg). plotters is a strong contender as it's designed for data visualization and can render to various formats.

2. Create an Image Generation Service: Build a new module (e.g., src/image_gen.rs) that takes a list of transactions (fetched from our DB) and generates a visual representation, like a bar chart of spending by category or a timeline.

3. Expose via API: Create a final Axum handler, perhaps GET /api/transactions/:user_id/image, that generates and returns the image file.

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Let's Start with Stage 1.1

I propose we begin with the first, most fundamental step: defining the data models for Accounts and Transactions. This is low-risk, gets us closer to our goal, and is a prerequisite for everything else.

Does this roadmap and starting point make sense to you? Once we agree, I can provide the specific code snippets for the data models.

1. https://abank.open.bankingapi.ru
2. https://www.reddit.com/r/rust/comments/1ia29hp/safest_way_to_store_api_keys_for_production_tauri/
3. https://www.reddit.com/r/rust/comments/l5b0pq/how_to_manage_api_keys_in_an_open_source_project/
4. https://github.com/IAmMadfly/rust-up-bank-rest-api
5. https://stackoverflow.com/questions/57650692/where-to-store-the-refresh-token-on-the-client
6. https://docs.rs/near-contract-standards/latest/near_contract_standards/storage_management/index.html
7. https://stackoverflow.com/questions/58972571/where-to-securely-store-an-access-token-used-for-api-requests-from-the-monzo-ban
8. https://tms-dev-blog.com/jwt-security-for-a-rust-rest-api/
9. https://auth0.com/blog/build-an-api-in-rust-with-jwt-authentication-using-actix-web/
10. https://users.rust-lang.org/t/best-practices-for-managing-authentication-and-sessions-in-rust-web-applications/115884