Restrict your Telegram bot to approved users only

flowchart TD trig>"user messages the bot"]:::trig s0["receive message"]:::task s1["check user against approved list"]:::task s2["respond to user"]:::task trig --> s0 s0 --> s1 gx{"× is user approved"}:::gate s1 --> gx p00["respond normally"]:::task gx -->|"approved user"| p00 p10["send denial message"]:::task gx -->|"unapproved user"| p10 p11["notify owner of attempt"]:::task p10 --> p11 p00 --> s2 p11 --> s2 out[/"only approved users get responses"/]:::out pay{{"blocks unauthorized use and cost"}}:::pay s2 --> out out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff