openrtc 1.0.1

OpenRTC: a Rust-first P2P runtime for device discovery, signaling, and iroh/QUIC networking.
Documentation 
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use base64::Engine;

/// Best-effort Firebase ID-token `sub` extraction for Firestore rule fields.
/// Does not verify the JWT signature; the token is already the caller's credential.
pub fn firebase_uid_from_id_token(token: &str) -> Option<String> {
    let payload_segment = token.split('.').nth(1)?.trim();
    if payload_segment.is_empty() {
        return None;
    }

    let mut padded = payload_segment.to_string();
    let remainder = padded.len() % 4;
    if remainder != 0 {
        padded.push_str(&"=".repeat(4 - remainder));
    }

    let decoded = base64::engine::general_purpose::URL_SAFE_NO_PAD
        .decode(payload_segment)
        .or_else(|_| base64::engine::general_purpose::URL_SAFE.decode(&padded))
        .ok()?;
    let json: serde_json::Value = serde_json::from_slice(&decoded).ok()?;
    json.get("sub")
        .or_else(|| json.get("user_id"))
        .and_then(|value| value.as_str())
        .map(str::to_string)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn firebase_uid_from_id_token_reads_sub_claim() {
        // Header: {"alg":"none","typ":"JWT"}
        // Payload: {"sub":"user-abc-123","aud":"test"}
        let token = "eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.\
            eyJzdWIiOiJ1c2VyLWFiYy0xMjMiLCJhdWQiOiJ0ZXN0In0.\
            signature";
        assert_eq!(
            firebase_uid_from_id_token(token).as_deref(),
            Some("user-abc-123"),
        );
    }
}