148 lines
5.1 KiB
Rust
148 lines
5.1 KiB
Rust
use chrono::prelude::*;
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use jsonwebtoken::{DecodingKey, EncodingKey, Header, Validation};
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use serde::{Deserialize, Serialize};
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const SECRET: &str = "some-secret";
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#[derive(Debug, PartialEq, Serialize, Deserialize)]
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struct Claims {
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sub: String,
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#[serde(with = "jwt_numeric_date")]
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iat: DateTime<Utc>,
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#[serde(with = "jwt_numeric_date")]
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exp: DateTime<Utc>,
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}
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impl Claims {
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/// If a token should always be equal to its representation after serializing and deserializing
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/// again, this function must be used for construction. `DateTime` contains a microsecond field
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/// but JWT timestamps are defined as UNIX timestamps (seconds). This function normalizes the
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/// timestamps.
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pub fn new(sub: String, iat: DateTime<Utc>, exp: DateTime<Utc>) -> Self {
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// normalize the timestamps by stripping of microseconds
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let iat = iat.date().and_hms_milli(iat.hour(), iat.minute(), iat.second(), 0);
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let exp = exp.date().and_hms_milli(exp.hour(), exp.minute(), exp.second(), 0);
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Self { sub, iat, exp }
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}
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}
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mod jwt_numeric_date {
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//! Custom serialization of DateTime<Utc> to conform with the JWT spec (RFC 7519 section 2, "Numeric Date")
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use chrono::{DateTime, TimeZone, Utc};
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use serde::{self, Deserialize, Deserializer, Serializer};
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/// Serializes a DateTime<Utc> to a Unix timestamp (milliseconds since 1970/1/1T00:00:00T)
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pub fn serialize<S>(date: &DateTime<Utc>, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let timestamp = date.timestamp();
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serializer.serialize_i64(timestamp)
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}
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/// Attempts to deserialize an i64 and use as a Unix timestamp
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pub fn deserialize<'de, D>(deserializer: D) -> Result<DateTime<Utc>, D::Error>
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where
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D: Deserializer<'de>,
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{
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Utc.timestamp_opt(i64::deserialize(deserializer)?, 0)
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.single() // If there are multiple or no valid DateTimes from timestamp, return None
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.ok_or_else(|| serde::de::Error::custom("invalid Unix timestamp value"))
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}
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#[cfg(test)]
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mod tests {
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const EXPECTED_TOKEN: &str = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJDdXN0b20gRGF0ZVRpbWUgc2VyL2RlIiwiaWF0IjowLCJleHAiOjMyNTAzNjgwMDAwfQ.RTgha0S53MjPC2pMA4e2oMzaBxSY3DMjiYR2qFfV55A";
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use super::super::{Claims, SECRET};
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use chrono::{Duration, TimeZone, Utc};
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use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
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#[test]
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fn round_trip() {
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let sub = "Custom DateTime ser/de".to_string();
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let iat = Utc.timestamp(0, 0);
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let exp = Utc.timestamp(32503680000, 0);
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let claims = Claims::new(sub.clone(), iat, exp);
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let token =
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encode(&Header::default(), &claims, &EncodingKey::from_secret(SECRET.as_ref()))
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.expect("Failed to encode claims");
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assert_eq!(&token, EXPECTED_TOKEN);
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let decoded = decode::<Claims>(
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&token,
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&DecodingKey::from_secret(SECRET.as_ref()),
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&Validation::default(),
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)
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.expect("Failed to decode token");
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assert_eq!(decoded.claims, claims);
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}
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#[test]
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fn should_fail_on_invalid_timestamp() {
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// A token with the expiry of i64::MAX + 1
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let overflow_token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJDdXN0b20gRGF0ZVRpbWUgc2VyL2RlIiwiaWF0IjowLCJleHAiOjkyMjMzNzIwMzY4NTQ3NzYwMDB9.G2PKreA27U8_xOwuIeCYXacFYeR46f9FyENIZfCrvEc";
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let decode_result = decode::<Claims>(
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&overflow_token,
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&DecodingKey::from_secret(SECRET.as_ref()),
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&Validation::default(),
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);
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assert!(decode_result.is_err());
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}
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#[test]
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fn to_token_and_parse_equals_identity() {
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let iat = Utc::now();
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let exp = iat + Duration::days(1);
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let sub = "Custom DateTime ser/de".to_string();
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let claims = Claims::new(sub.clone(), iat, exp);
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let token =
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encode(&Header::default(), &claims, &EncodingKey::from_secret(SECRET.as_ref()))
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.expect("Failed to encode claims");
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let decoded = decode::<Claims>(
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&token,
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&DecodingKey::from_secret(SECRET.as_ref()),
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&Validation::default(),
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)
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.expect("Failed to decode token")
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.claims;
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assert_eq!(claims, decoded);
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}
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}
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let sub = "Custom DateTime ser/de".to_string();
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let iat = Utc::now();
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let exp = iat + chrono::Duration::days(1);
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let claims = Claims::new(sub, iat, exp);
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let token = jsonwebtoken::encode(
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&Header::default(),
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&claims,
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&EncodingKey::from_secret(SECRET.as_ref()),
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)?;
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println!("serialized token: {}", &token);
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let token_data = jsonwebtoken::decode::<Claims>(
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&token,
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&DecodingKey::from_secret(SECRET.as_ref()),
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&Validation::default(),
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)?;
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println!("token data:\n{:#?}", &token_data);
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Ok(())
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}
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