chuanyue-service/library/src/social/google.rs

use std::{collections::HashMap, sync::Arc};

use chrono::Utc;
use futures_util::lock::Mutex;
use jsonwebtoken::{decode, Algorithm, DecodingKey, Validation};
use lazy_static::lazy_static;
use reqwest::Client;
use serde::Deserialize;
use serde_json::Value;

use crate::resp::response::ResErr;

use super::SocialResult;

lazy_static! {
    pub static ref GOOGLE_SOCIAL: GoogleSocial = GoogleSocial::default();
}

#[derive(Default)]
pub struct GoogleSocial {
    google_public_keys: Arc<Mutex<GooglePublicKeys>>,
}

// 假设GOOGLE_PUBLIC_CERT_URL是Google提供的公钥URL
const GOOGLE_PUBLIC_CERT_URL: &str = "https://www.googleapis.com/oauth2/v3/certs";

#[derive(Debug, Default)]
pub struct GoogleJwtProfile {
    // iss (issuer)：签发人
    pub iss: String,
    // sub (subject)：主题
    pub sub: String,
    pub azp: String,
    // aud (audience)：受众
    pub aud: String,
    // iat (Issued At)：签发时间
    pub iat: i64,
    // exp (expiration time)：过期时间
    pub exp: i64,
    pub email: String,
    pub email_verified: bool,
    pub at_hash: String,
    pub name: String,
    pub picture: String,
    pub given_name: String,
    pub family_name: String,
    pub locale: String,
}

impl GoogleJwtProfile {
    fn new() -> Self {
        GoogleJwtProfile {
            ..Default::default()
        }
    }
}

impl From<Value> for GoogleJwtProfile {
    fn from(value: Value) -> Self {
        let mut google_jwt_profile = GoogleJwtProfile::new();
        if let Some(value) = value.get("iss") {
            google_jwt_profile.iss = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("sub") {
            google_jwt_profile.sub = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("azp") {
            google_jwt_profile.azp = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("aud") {
            google_jwt_profile.aud = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("iat") {
            google_jwt_profile.iat = value.as_i64().unwrap_or_default();
        }
        if let Some(value) = value.get("exp") {
            google_jwt_profile.exp = value.as_i64().unwrap_or_default();
        }
        if let Some(value) = value.get("email") {
            google_jwt_profile.email = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("email_verified") {
            google_jwt_profile.email_verified = value.as_bool().unwrap_or_default();
        }
        if let Some(value) = value.get("at_hash") {
            google_jwt_profile.at_hash = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("name") {
            google_jwt_profile.name = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("picture") {
            google_jwt_profile.picture = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("given_name") {
            google_jwt_profile.given_name = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("family_name") {
            google_jwt_profile.family_name = value.as_str().unwrap().to_string();
        }
        if let Some(value) = value.get("locale") {
            google_jwt_profile.locale = value.as_str().unwrap().to_string();
        }
        google_jwt_profile
    }
}

#[derive(Deserialize, Debug, Clone, Default)]
struct GooglePublicKey {
    e: String,
    n: String,
    kty: String,
    use_: String,
    alg: String,
    kid: String,
}

#[derive(Deserialize, Debug, Clone, Default)]
struct GooglePublicKeys {
    keys: Vec<GooglePublicKey>,
    refresh_at: i64,
}

impl GoogleSocial {
    // 异步获取并解析Google公钥
    async fn fetch_and_parse_google_public_keys(&self) -> SocialResult<HashMap<String, GooglePublicKey>>
    {
        let mut public_keys = self.google_public_keys.lock().await;
        if public_keys.keys.is_empty() || public_keys.refresh_at < Utc::now().timestamp() {
            let response = Client::new().get(GOOGLE_PUBLIC_CERT_URL).send().await?;
            let mut google_keys: GooglePublicKeys = response.json().await?;
            tracing::info!("Google公钥获取成功, {:?}", google_keys);
            google_keys.refresh_at = Utc::now().timestamp() + 3600;
            *public_keys = google_keys;
        }

        let mut key_map = HashMap::new();
        // 解析公钥
        for key in public_keys.keys.iter() {
            if key.kty == "RSA" {
                key_map.insert(key.kid.to_owned(), key.to_owned());
            }
        }

        tracing::info!("Google公钥解析成功, {:?}", key_map);
        Ok(key_map)
    }

    // 验证ID Token并考虑kid匹配
    pub async fn verify_id_token(&self, id_token: &str) -> SocialResult<GoogleJwtProfile> {
        // 获取并解析公钥
        let public_keys = self.fetch_and_parse_google_public_keys().await?;

        // 解码Token头部以获取kid
        let token_header = jsonwebtoken::decode_header(id_token).unwrap();
        let kid = token_header.kid;

        // 检查是否找到了有效的kid
        if kid.is_none() {
            return Err(Box::new(ResErr::social("校验Token失败,未找到有效的kid")));
        }
        let kid = kid.unwrap();

        // 根据kid找到正确的公钥
        let key = public_keys
            .get(&kid)
            .ok_or_else(|| Box::new(ResErr::social("校验Token失败,未找到正确的公钥")))?;

        tracing::info!("public key : {:?}", key);

        // 验证Token
        let mut validation: Validation = Validation::new(Algorithm::RS256);
        validation.set_issuer(&["https://accounts.google.com", "accounts.google.com"]); // 设置预期的发行者
        validation.validate_aud = false;

        let decoded = decode::<Value>(
            id_token,
            &DecodingKey::from_rsa_components(key.n.as_str(), key.e.as_str()).unwrap(),
            &validation,
        )?;

        let claims: Value = decoded.claims;
        let google_jwt_profile = GoogleJwtProfile::from(claims);

        // 校验有效期
        if google_jwt_profile.exp < Utc::now().timestamp() {
            return Err(Box::new(ResErr::social("校验Token失败,token有效期无效")));
        }

        Ok(google_jwt_profile)
    }
}