cedros-login-server 0.0.39

//! Google OAuth authentication handler

use axum::{extract::State, http::HeaderMap, response::IntoResponse, Json};
use chrono::{Duration, Utc};
use std::sync::Arc;

use crate::callback::{AuthCallback, AuthCallbackPayload};
use crate::errors::AppError;
use crate::handlers::auth::{
    call_authenticated_callback_with_timeout, call_registered_callback_with_timeout,
};
use crate::models::{AuthMethod, AuthResponse, GoogleAuthRequest};
use crate::repositories::normalize_email;
use crate::repositories::{
    generate_api_key, ApiKeyEntity, AuditEventType, MembershipEntity, SessionEntity,
    TransactionalOps, UserEntity,
};
use crate::services::EmailService;
use crate::utils::{
    build_json_response_with_cookies, compute_post_login, extract_client_ip_with_fallback,
    get_default_org_context, hash_refresh_token, resolve_org_assignment,
    user_entity_to_auth_user, PeerIp,
};
use crate::AppState;

/// POST /auth/google - Authenticate with Google ID token
pub async fn google_auth<C: AuthCallback, E: EmailService>(
    State(state): State<Arc<AppState<C, E>>>,
    headers: HeaderMap,
    PeerIp(peer_ip): PeerIp,
    Json(req): Json<GoogleAuthRequest>,
) -> Result<impl IntoResponse, AppError> {
    // Enabled check: runtime setting > static config
    let enabled = state
        .settings_service
        .get_bool("auth_google_enabled")
        .await
        .ok()
        .flatten()
        .unwrap_or(state.config.google.enabled);
    if !enabled {
        return Err(AppError::NotFound("Google auth disabled".into()));
    }

    // Resolve client_id: runtime setting > static config
    let client_id = state
        .settings_service
        .get("auth_google_client_id")
        .await
        .ok()
        .flatten()
        .filter(|s| !s.is_empty())
        .or_else(|| state.config.google.client_id.clone())
        .ok_or_else(|| AppError::Config("Google client ID not configured".into()))?;

    // GeoIP country screening (fail-open: skipped when header not configured or absent)
    state.sanctions_service.check_country_from_request(&headers).await?;

    // Verify the Google token (ID token from One Tap, or access token from popup)
    let claims = match (&req.id_token, &req.access_token) {
        (Some(id_token), _) => {
            state
                .google_service
                .verify_id_token(id_token, &client_id)
                .await?
        }
        (_, Some(access_token)) => {
            state
                .google_service
                .verify_access_token(access_token)
                .await?
        }
        _ => return Err(AppError::Validation("Either idToken or accessToken is required".into())),
    };

    let email = claims
        .email
        .ok_or(AppError::Validation("Email not provided by Google".into()))?;
    let normalized_email = normalize_email(&email);

    // Check if user exists by Google ID
    let existing_user = state.user_repo.find_by_google_id(&claims.sub).await?;

    let (user, is_new_user, api_key) = if let Some(user) = existing_user {
        (user, false, None)
    } else if let Some(mut existing) = state.user_repo.find_by_email(&normalized_email).await? {
        // Autolink: Google has verified this email, so we can safely link the
        // Google ID to the existing account without requiring a password proof.
        let now = Utc::now();
        existing.google_id = Some(claims.sub);
        existing.updated_at = now;
        existing.last_login_at = Some(now);
        if !existing.auth_methods.contains(&AuthMethod::Google) {
            existing.auth_methods.push(AuthMethod::Google);
        }
        // Backfill profile fields from Google if missing
        if existing.name.is_none() {
            existing.name = claims.name;
        }
        if existing.picture.is_none() {
            existing.picture = claims.picture;
        }
        let user = state.user_repo.update(existing).await?;
        (user, false, None)
    } else {
        // Signup gating: enforce access codes and/or rate limits for new users
        let gate_result = state
            .signup_gating_service
            .check_signup(req.access_code.as_deref())
            .await?;

        // Create new user
        let now = Utc::now();
        let mut user = UserEntity {
            id: uuid::Uuid::new_v4(),
            email: Some(normalized_email),
            email_verified: true, // Google verified the email
            password_hash: None,
            name: claims.name,
            username: None,
            picture: claims.picture,
            wallet_address: None,
            google_id: Some(claims.sub),
            apple_id: None,
            stripe_customer_id: None,
            auth_methods: vec![AuthMethod::Google],
            is_system_admin: false,
            created_at: now,
            updated_at: now,
            last_login_at: Some(now),
            welcome_completed_at: None,
            referral_code: crate::repositories::generate_referral_code(),
            referred_by: None,
            payout_wallet_address: None,
            kyc_status: "none".to_string(),
            kyc_verified_at: None,
            kyc_expires_at: None,
            accreditation_status: "none".to_string(),
            accreditation_verified_at: None,
            accreditation_expires_at: None,
        };
        // Resolve referral: if feature enabled and referral code provided, link referrer
        let referrals_enabled = state
            .settings_service
            .get_bool("feature_referrals_enabled")
            .await
            .ok()
            .flatten()
            .unwrap_or(false);
        if referrals_enabled {
            if let Some(ref code) = req.referral {
                match state.user_repo.find_by_referral_code(code).await {
                    Ok(Some(referrer)) => {
                        user.referred_by = Some(referrer.id);
                    }
                    Ok(None) => {
                        tracing::debug!(referral_code = %code, "Referral code not found, ignoring");
                    }
                    Err(e) => {
                        tracing::warn!(error = %e, "Failed to look up referral code, ignoring");
                    }
                }
            }
        }

        let org_assignment = resolve_org_assignment(&state, user.id).await?;
        let membership = MembershipEntity::new(user.id, org_assignment.org_id, org_assignment.role);
        let raw_api_key = generate_api_key();
        let api_key_entity = ApiKeyEntity::new(user.id, &raw_api_key, "default");

        #[cfg(feature = "postgres")]
        let user = if let Some(pool) = state.postgres_pool.as_ref() {
            TransactionalOps::create_user_with_membership_and_api_key(
                pool, &user, &membership, &api_key_entity,
            )
            .await?;
            user
        } else {
            let created = state.user_repo.create(user).await?;
            state.membership_repo.create(membership).await?;
            state.api_key_repo.create(api_key_entity).await?;
            created
        };

        #[cfg(not(feature = "postgres"))]
        let user = {
            let created = state.user_repo.create(user).await?;
            state.membership_repo.create(membership).await?;
            state.api_key_repo.create(api_key_entity).await?;
            created
        };

        // Mark access code as used (non-fatal)
        if let Some(code_id) = gate_result.access_code_id {
            if let Err(e) = state.signup_gating_service.mark_code_used(code_id).await {
                tracing::warn!(
                    user_id = %user.id,
                    code_id = %code_id,
                    error = %e,
                    "Failed to mark access code as used"
                );
            }
        }

        (user, true, Some(raw_api_key))
    };

    // Issue referral signup reward for new users (non-fatal)
    if is_new_user {
        if let Some(referrer_id) = user.referred_by {
            if let Err(e) = crate::services::referral_reward_service::issue_signup_reward(
                &*state.user_repo,
                &*state.credit_repo,
                &*state.referral_payout_repo,
                &state.settings_service,
                &*state.callback,
                user.id,
                referrer_id,
                &state.config.privacy.company_currency,
            )
            .await
            {
                tracing::warn!(
                    user_id = %user.id,
                    referrer_id = %referrer_id,
                    error = %e,
                    "Failed to issue referral signup reward"
                );
            }
        }
    }

    // Get user's memberships to find default org context
    let memberships = state.membership_repo.find_by_user(user.id).await?;
    let token_context = get_default_org_context(&memberships, user.is_system_admin, user.email_verified);

    // Create session with org context
    let session_id = uuid::Uuid::new_v4();
    let token_pair =
        state
            .jwt_service
            .generate_token_pair_with_context(user.id, session_id, &token_context)?;
    let refresh_expiry =
        Utc::now() + Duration::seconds(state.jwt_service.refresh_expiry_secs() as i64);

    let ip_address =
        extract_client_ip_with_fallback(&headers, state.config.server.trust_proxy, peer_ip);
    let user_agent = headers
        .get(axum::http::header::USER_AGENT)
        .and_then(|v| v.to_str().ok())
        .map(|s| s.to_string());

    let mut session = SessionEntity::new_with_id(
        session_id,
        user.id,
        hash_refresh_token(&token_pair.refresh_token, &state.config.jwt.secret),
        refresh_expiry,
        ip_address.clone(),
        user_agent.clone(),
    );
    session.last_strong_auth_at = Some(Utc::now());
    state.session_repo.create(session).await?;

    // Fire callback
    let auth_user = user_entity_to_auth_user(&user);
    let payload = AuthCallbackPayload {
        user: auth_user.clone(),
        method: AuthMethod::Google,
        is_new_user,
        session_id: session_id.to_string(),
        ip_address,
        user_agent,
        referral: req.referral.clone(),
    };

    let callback_data = if is_new_user {
        call_registered_callback_with_timeout(&state.callback, &payload).await
    } else {
        call_authenticated_callback_with_timeout(&state.callback, &payload).await
    };

    // Log audit event (fire-and-forget, don't fail auth on audit error)
    let audit_event = if is_new_user {
        AuditEventType::UserRegister
    } else {
        AuditEventType::UserLogin
    };
    let _ = state
        .audit_service
        .log_user_event(audit_event, user.id, Some(&headers))
        .await;

    let response_tokens = if state.config.cookie.enabled {
        None
    } else {
        Some(token_pair.clone())
    };

    let response = AuthResponse {
        user: auth_user,
        tokens: response_tokens,
        is_new_user,
        callback_data,
        api_key,
        email_queued: None,
        post_login: compute_post_login(&user, &state.settings_service, &*state.totp_repo, &*state.credential_repo, &*state.wallet_material_repo, &*state.storage.pending_wallet_recovery_repo).await,
    };

    Ok(build_json_response_with_cookies(
        &state.config.cookie,
        &token_pair,
        state.jwt_service.refresh_expiry_secs(),
        response,
    ))
}