github.com/dolthub/dolt/go@v0.40.5-0.20240520175717-68db7794bea6/libraries/utils/jwtauth/validate.go (about)

     1  // Copyright 2022 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package jwtauth
    16  
    17  import (
    18  	"errors"
    19  	"fmt"
    20  	"time"
    21  
    22  	jose "gopkg.in/square/go-jose.v2"
    23  	"gopkg.in/square/go-jose.v2/jwt"
    24  )
    25  
    26  type KeyProvider interface {
    27  	GetKey(kid string) ([]jose.JSONWebKey, error)
    28  }
    29  
    30  var ErrKeyNotFound = errors.New("Key not found")
    31  
    32  func ValidateJWT(unparsed string, reqTime time.Time, keyProvider KeyProvider, expectedClaims jwt.Expected) (*Claims, error) {
    33  	parsed, err := jwt.ParseSigned(unparsed)
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  
    38  	if len(parsed.Headers) != 1 {
    39  		return nil, fmt.Errorf("ValidateJWT: Unexpected JWT headers length %v.", len(parsed.Headers))
    40  	}
    41  
    42  	if parsed.Headers[0].Algorithm != "RS512" &&
    43  		parsed.Headers[0].Algorithm != "RS256" &&
    44  		parsed.Headers[0].Algorithm != "EdDSA" {
    45  		return nil, fmt.Errorf("ValidateJWT: Currently only support RS256, RS512 and EdDSA signatures. Unexpected algorithm: %v", parsed.Headers[0].Algorithm)
    46  	}
    47  
    48  	keyID := parsed.Headers[0].KeyID
    49  
    50  	keys, err := keyProvider.GetKey(keyID)
    51  	if err != nil {
    52  		return nil, err
    53  	}
    54  
    55  	var claims Claims
    56  	claimsError := fmt.Errorf("ValidateJWT: KeyID: %v. Err: %w", keyID, ErrKeyNotFound)
    57  	for _, key := range keys {
    58  		claimsError = parsed.Claims(key.Key, &claims)
    59  		if claimsError == nil {
    60  			break
    61  		}
    62  	}
    63  	if claimsError != nil {
    64  		return nil, claimsError
    65  	}
    66  
    67  	if err := claims.Validate(expectedClaims.WithTime(reqTime)); err != nil {
    68  		return nil, err
    69  	}
    70  
    71  	return &claims, nil
    72  }