1use crate::Cents;
  2use crate::db::{billing_subscription, user};
  3use crate::llm::{DEFAULT_MAX_MONTHLY_SPEND, FREE_TIER_MONTHLY_SPENDING_LIMIT};
  4use crate::{Config, db::billing_preference};
  5use anyhow::{Result, anyhow};
  6use chrono::{NaiveDateTime, Utc};
  7use jsonwebtoken::{DecodingKey, EncodingKey, Header, Validation};
  8use serde::{Deserialize, Serialize};
  9use std::time::Duration;
 10use thiserror::Error;
 11use util::maybe;
 12use uuid::Uuid;
 13use zed_llm_client::Plan;
 14
 15#[derive(Clone, Debug, Default, Serialize, Deserialize)]
 16#[serde(rename_all = "camelCase")]
 17pub struct LlmTokenClaims {
 18    pub iat: u64,
 19    pub exp: u64,
 20    pub jti: String,
 21    pub user_id: u64,
 22    pub system_id: Option<String>,
 23    pub metrics_id: Uuid,
 24    pub github_user_login: String,
 25    pub account_created_at: NaiveDateTime,
 26    pub is_staff: bool,
 27    pub has_llm_closed_beta_feature_flag: bool,
 28    pub bypass_account_age_check: bool,
 29    pub has_predict_edits_feature_flag: bool,
 30    pub has_llm_subscription: bool,
 31    pub max_monthly_spend_in_cents: u32,
 32    pub custom_llm_monthly_allowance_in_cents: Option<u32>,
 33    pub plan: Plan,
 34    #[serde(default)]
 35    pub subscription_period: Option<(NaiveDateTime, NaiveDateTime)>,
 36}
 37
 38const LLM_TOKEN_LIFETIME: Duration = Duration::from_secs(60 * 60);
 39
 40impl LlmTokenClaims {
 41    pub fn create(
 42        user: &user::Model,
 43        is_staff: bool,
 44        billing_preferences: Option<billing_preference::Model>,
 45        feature_flags: &Vec<String>,
 46        has_legacy_llm_subscription: bool,
 47        plan: rpc::proto::Plan,
 48        subscription: Option<billing_subscription::Model>,
 49        system_id: Option<String>,
 50        config: &Config,
 51    ) -> Result<String> {
 52        let secret = config
 53            .llm_api_secret
 54            .as_ref()
 55            .ok_or_else(|| anyhow!("no LLM API secret"))?;
 56
 57        let now = Utc::now();
 58        let claims = Self {
 59            iat: now.timestamp() as u64,
 60            exp: (now + LLM_TOKEN_LIFETIME).timestamp() as u64,
 61            jti: uuid::Uuid::new_v4().to_string(),
 62            user_id: user.id.to_proto(),
 63            system_id,
 64            metrics_id: user.metrics_id,
 65            github_user_login: user.github_login.clone(),
 66            account_created_at: user.account_created_at(),
 67            is_staff,
 68            has_llm_closed_beta_feature_flag: feature_flags
 69                .iter()
 70                .any(|flag| flag == "llm-closed-beta"),
 71            bypass_account_age_check: feature_flags
 72                .iter()
 73                .any(|flag| flag == "bypass-account-age-check"),
 74            has_predict_edits_feature_flag: feature_flags
 75                .iter()
 76                .any(|flag| flag == "predict-edits"),
 77            has_llm_subscription: has_legacy_llm_subscription,
 78            max_monthly_spend_in_cents: billing_preferences
 79                .map_or(DEFAULT_MAX_MONTHLY_SPEND.0, |preferences| {
 80                    preferences.max_monthly_llm_usage_spending_in_cents as u32
 81                }),
 82            custom_llm_monthly_allowance_in_cents: user
 83                .custom_llm_monthly_allowance_in_cents
 84                .map(|allowance| allowance as u32),
 85            plan: match plan {
 86                rpc::proto::Plan::Free => Plan::Free,
 87                rpc::proto::Plan::ZedPro => Plan::ZedPro,
 88                rpc::proto::Plan::ZedProTrial => Plan::ZedProTrial,
 89            },
 90            subscription_period: maybe!({
 91                let subscription = subscription?;
 92                let period_start_at = subscription.current_period_start_at()?;
 93                let period_end_at = subscription.current_period_end_at()?;
 94
 95                Some((period_start_at.naive_utc(), period_end_at.naive_utc()))
 96            }),
 97        };
 98
 99        Ok(jsonwebtoken::encode(
100            &Header::default(),
101            &claims,
102            &EncodingKey::from_secret(secret.as_ref()),
103        )?)
104    }
105
106    pub fn validate(token: &str, config: &Config) -> Result<LlmTokenClaims, ValidateLlmTokenError> {
107        let secret = config
108            .llm_api_secret
109            .as_ref()
110            .ok_or_else(|| anyhow!("no LLM API secret"))?;
111
112        match jsonwebtoken::decode::<Self>(
113            token,
114            &DecodingKey::from_secret(secret.as_ref()),
115            &Validation::default(),
116        ) {
117            Ok(token) => Ok(token.claims),
118            Err(e) => {
119                if e.kind() == &jsonwebtoken::errors::ErrorKind::ExpiredSignature {
120                    Err(ValidateLlmTokenError::Expired)
121                } else {
122                    Err(ValidateLlmTokenError::JwtError(e))
123                }
124            }
125        }
126    }
127
128    pub fn free_tier_monthly_spending_limit(&self) -> Cents {
129        self.custom_llm_monthly_allowance_in_cents
130            .map(Cents)
131            .unwrap_or(FREE_TIER_MONTHLY_SPENDING_LIMIT)
132    }
133}
134
135#[derive(Error, Debug)]
136pub enum ValidateLlmTokenError {
137    #[error("access token is expired")]
138    Expired,
139    #[error("access token validation error: {0}")]
140    JwtError(#[from] jsonwebtoken::errors::Error),
141    #[error("{0}")]
142    Other(#[from] anyhow::Error),
143}