subscribers-chat

My attempt at building a fast and reliable application with zero-knowledge, end-to-end encrypted chat and industry-specific features.

Backend

Messaging

Frontend

Desktop

Topology

A NATS supercluster: three regional clusters (3 nodes each, full-mesh routes), linked region-to-region by gateways, fronted by Cloudflare. Clients reach the nearest region over WebSocket; the desktop app runs an embedded leaf node.

flowchart TB
    desktop["🖥️ Tauri desktop<br/>(embedded leaf)"]
    browser["🌐 Browser (wss)"]
    backend["⚙️ Spring Boot services"]
    auth["🔑 Spring Authorization Server<br/>(OAuth2 · NATS auth-callout)"]

    edge{{"☁️ Cloudflare edge"}}

    desktop --> edge
    browser --> edge
    backend --> edge

    edge -->|wss-japan| JP
    edge -->|wss-australia| AU
    edge -->|wss-singapore| SG

    subgraph JP["🇯🇵 japan"]
        direction LR
        j1((n1)) --- j2((n2)) --- j3((n3)) --- j1
    end
    subgraph AU["🇦🇺 australia"]
        direction LR
        a1((n1)) --- a2((n2)) --- a3((n3)) --- a1
    end
    subgraph SG["🇸🇬 singapore"]
        direction LR
        s1((n1)) --- s2((n2)) --- s3((n3)) --- s1
    end

    JP <==>|gateway| AU
    AU <==>|gateway| SG
    SG <==>|gateway| JP

    auth -.->|verifies tokens| edge

    classDef edge fill:#F38020,stroke:#fff,stroke-width:2px,color:#fff;
    classDef region fill:#0d2840,stroke:#27AAE1,color:#e6edf3;
    classDef cli fill:#161b22,stroke:#8b949e,color:#e6edf3;
    classDef node fill:#10302a,stroke:#3fb950,color:#3fb950;

    class edge edge;
    class JP,AU,SG region;
    class desktop,browser,backend,auth cli;
    class j1,j2,j3,a1,a2,a3,s1,s2,s3 node;