# dhanushmsr/secure-file-transmissions architecture

> Architecture diagram of the GitHub repository dhanushmsr/secure-file-transmissions, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-20). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/dhanushmsr/secure-file-transmissions
- Repository: https://github.com/dhanushmsr/secure-file-transmissions

## Overview

#### Purpose and Entry Points
This is a Python web application centered on a “transmission system” workflow, with distinct sender, receiver, administrator, feedback, and history views. The primary application entry point is `app.py`; deployment process startup is likely represented by `procfile`. Python dependencies are declared in `requirements.txt`.

#### Application and Request Boundary
`app.py` is the central control boundary: it likely initializes the web runtime, defines routes, accepts user actions, coordinates persistence, and renders the HTML views. Browser-facing assets and server-rendered templates are separated into:
- `templates/`
- `static/`
- `app.py`

#### Role-Oriented User Flows
The UI is organized around explicit operational roles:
- Sender workflow: `templates/sender.html`
- Receiver workflow: `templates/receiver.html`
- Administrative workflow: `templates/admin.html`
- Authentication entry: `templates/login.html`

A typical control flow is browser request → route in `app.py` → database/file interaction → template render or redirect. Sender and receiver pages are the primary domain boundary; administrative access is a separate management boundary.

#### Persistence and Historical Records
The repository includes a local SQLite database, `transmission_system.db`, which is the material persistence layer for application state. Historical/audit-oriented views are distinct from active workflows:
- `templates/history.html`
- `templates/admin_history.html`
- `transmission_system.db`

This suggests history is exposed differently to ordinary users and administrators, with `app.py` mediating authorization and record retrieval.

#### File/Audio Handling
The application has a server-side upload area at `static/uploads/`, containing an example WAV file:
- `static/uploads/file_example_WAV_1MG1.wav`
- `static/uploads/`

This indicates transmitted or processed artifacts may include audio files. The important boundary is between user-originated file content, application handling in `app.py`, and publicly served static storage. Upload validation, naming, and access control are therefore architecturally sensitive responsibilities.

#### Feedback and Presentation Layer
Feedback is a first-class interaction path through `templates/feedback.html`, likely allowing users to submit or review transmission-related comments. Shared visual styling is served from:
- `static/css/style.css`
- `templates/feedback.html`

The application is server-rendered rather than a separate frontend service: templates, static content, runtime logic, uploads, and SQLite persistence are co-located in one deployable unit.

#### Runtime and Infrastructure
Material runtime/infrastructure elements are:
- Python application process: `app.py`
- Dependency environment: `requirements.txt`
- Process deployment declaration: `procfile`
- Local relational persistence: `transmission_system.db`
- Static file serving/upload storage: `static/`

No external API, queue, cloud service, or separate worker process is evidenced by the repository tree.

Main entry points: [`app.py`](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/app.py) (Web application), [`static/css/style.css`](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/static/css/style.css) (Shared styles), [`transmission_system.db`](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/transmission_system.db) (Transmission records), [`templates/sender.html`](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/sender.html) (Sender workflow)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_ui["Server-rendered UI"]
  node_login["Login<br/>authentication template<br/>[login.html]"]
  node_sender["Sender workflow<br/>template<br/>[sender.html]"]
  node_receiver["Receiver workflow<br/>template<br/>[receiver.html]"]
  node_admin["Admin workflow<br/>template<br/>[admin.html]"]
  node_feedback["Feedback<br/>template<br/>[feedback.html]"]
  node_history["User history<br/>template<br/>[history.html]"]
  node_admin_history["Admin history<br/>template<br/>[admin_history.html]"]
  node_styles["Shared styles<br/>stylesheet<br/>[style.css]"]
end

subgraph group_storage["Local storage"]
  node_database[("Transmission records<br/>SQLite database")]
  node_uploads["Upload storage<br/>static files"]
  node_sample_wav["Example WAV<br/>audio artifact"]
end

node_browser(("Browser users<br/>client"))
node_process["Process startup<br/>deployment"]
node_app["Web application<br/>Python runtime<br/>[app.py]"]
node_dependencies["Python dependencies<br/>dependency manifest<br/>[requirements.txt]"]

node_process -->|"starts"| node_app
node_dependencies -.->|"provides runtime packages"| node_app
node_browser -->|"HTTP requests"| node_app
node_app -->|"renders"| node_login
node_app -->|"renders"| node_sender
node_app -->|"renders"| node_receiver
node_app -->|"renders"| node_admin
node_app -->|"renders"| node_feedback
node_app -->|"renders"| node_history
node_app -->|"renders"| node_admin_history
node_app -->|"reads and writes records"| node_database
node_app -->|"stores and retrieves files"| node_uploads
node_uploads -->|"contains"| node_sample_wav
node_browser -.->|"serves static artifacts"| node_uploads
node_styles -.->|"styles"| node_sender
node_styles -.->|"styles"| node_receiver
node_styles -.->|"styles"| node_admin
node_styles -.->|"styles"| node_feedback
node_database -.->|"supplies records"| node_history
node_database -.->|"supplies records"| node_admin_history

click node_process "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/procfile"
click node_app "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/app.py"
click node_dependencies "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/requirements.txt"
click node_login "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/login.html"
click node_sender "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/sender.html"
click node_receiver "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/receiver.html"
click node_admin "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/admin.html"
click node_feedback "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/feedback.html"
click node_history "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/history.html"
click node_admin_history "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/admin_history.html"
click node_styles "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/static/css/style.css"
click node_database "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/transmission_system.db"
click node_sample_wav "https://github.com/dhanushmsr/secure-file-transmissions/blob/main/static/uploads/file_example_WAV_1MG1.wav"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_login,node_sender,node_receiver,node_admin,node_feedback,node_history,node_admin_history,node_styles toneBlue
class node_database,node_uploads,node_sample_wav toneAmber
class node_browser,node_process,node_app,node_dependencies toneNeutral
```

## Components

### Server-rendered UI

- [Login](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/login.html): authentication template · `templates/login.html`
- [Sender workflow](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/sender.html): template · `templates/sender.html`
- [Receiver workflow](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/receiver.html): template · `templates/receiver.html`
- [Admin workflow](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/admin.html): template · `templates/admin.html`
- [Feedback](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/feedback.html): template · `templates/feedback.html`
- [User history](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/history.html): template · `templates/history.html`
- [Admin history](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/templates/admin_history.html): template · `templates/admin_history.html`
- [Shared styles](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/static/css/style.css): stylesheet · `static/css/style.css`

### Local storage

- [Transmission records](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/transmission_system.db): SQLite database · Application state and historical records. · `transmission_system.db`
- **Upload storage**: static files · Publicly served transmitted or processed artifacts.
- [Example WAV](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/static/uploads/file_example_WAV_1MG1.wav): audio artifact · `static/uploads/file_example_WAV_1MG1.wav`

### Other components

- **Browser users**: client · Senders, receivers, administrators, and feedback users.
- [Process startup](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/procfile): deployment · `procfile`
- [Web application](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/app.py): Python runtime · Routes, authorization, transmission handling, and rendering. · `app.py`
- [Python dependencies](https://github.com/dhanushmsr/secure-file-transmissions/blob/main/requirements.txt): dependency manifest · `requirements.txt`

## Connections

- Process startup → Web application: starts
- Python dependencies → Web application: provides runtime packages
- Browser users → Web application: HTTP requests
- Web application → Login: renders
- Web application → Sender workflow: renders
- Web application → Receiver workflow: renders
- Web application → Admin workflow: renders
- Web application → Feedback: renders
- Web application → User history: renders
- Web application → Admin history: renders
- Web application → Transmission records: reads and writes records
- Web application → Upload storage: stores and retrieves files
- Upload storage → Example WAV: contains
- Browser users → Upload storage: serves static artifacts
- Shared styles → Sender workflow: styles
- Shared styles → Receiver workflow: styles
- Shared styles → Admin workflow: styles
- Shared styles → Feedback: styles
- Transmission records → User history: supplies records
- Transmission records → Admin history: supplies records