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[FIX] 카카오 네이티브앱키로 수정하면서, 파싱 수정 #66

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Merged
rud15dns merged 1 commit into from
Feb 10, 2026
Merged

[FIX] 카카오 네이티브앱키로 수정하면서, 파싱 수정 #66

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35 changes: 15 additions & 20 deletions src/main/java/com/meetkey/server/global/security/oauth/JwtOidcProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import com.meetkey.server.domain.auth.exception.AuthException;
import com.meetkey.server.global.security.oauth.dto.OidcDTO;
import io.jsonwebtoken.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.math.BigInteger;
Expand All @@ -13,36 +14,29 @@
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPublicKeySpec;
import java.util.Base64;
import java.util.Map;

@Slf4j
@Component
public class JwtOidcProvider {
private final String KID = "kid";

public String getKidFromIdTokenHeader(String token, String iss, String aud){
return (String) getIdTokenClaims(token, iss, aud).getHeader().get(KID);
}
public String getKidFromIdTokenHeader(String token, String iss, String aud) {
String[] parts = token.split("\\.");
if (parts.length != 3) {
throw new AuthException(AuthErrorStatus.INVALID_TOKEN);
}

private Jwt<Header, Claims> getIdTokenClaims(String token, String iss, String aud){
try {
return Jwts.parser()
.requireAudience(aud) // aud 검증 (app id)
.requireIssuer(iss) // iss 검증 (카카오)
.build()
.parseUnsecuredClaims(removeSigFromIdToken(token));
} catch (Exception e){
String headerJson = new String(Base64.getUrlDecoder().decode(parts[0]));
com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
Map<String, Object> header = mapper.readValue(headerJson, Map.class);
return (String) header.get(KID);
} catch (Exception e) {
log.error(e.getMessage());
throw new AuthException(AuthErrorStatus.INVALID_TOKEN);
}
}

/*
* idToken의 서명 제거 메서드
*/
private String removeSigFromIdToken(String token){
String[] splitToken = token.split("\\.");
if (splitToken.length != 3) throw new AuthException(AuthErrorStatus.INVALID_TOKEN);
return splitToken[0] + "." + splitToken[1] + "."; // Header, Payload 추출
}

/*
* 공개키로 서명 검증해서 iss, aud, sub 을 return.
* n: 공개키 모듈
Expand All @@ -64,6 +58,7 @@ private Jws<Claims> getOIDCTokenJws(String token, String n, String e){
.build()
.parseSignedClaims(token);
} catch (Exception ex){
log.error(ex.getMessage());
throw new AuthException(AuthErrorStatus.INVALID_TOKEN);
}
}
Expand Down