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jwt-validator.go
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jwt-validator.go
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// Licensed to NASA JPL under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. NASA JPL licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package jwtparser
import (
"crypto/x509"
"encoding/pem"
"fmt"
"net/http"
"github.com/auth0-community/go-auth0"
"github.com/pixlise/core/v4/core/fileaccess"
"gopkg.in/square/go-jose.v2"
"gopkg.in/square/go-jose.v2/jwt"
)
const apiAudience = "pixlise-backend"
// Implements a JWT validation and claim extraction interface
type JWTInterface interface {
ValidateRequest(r *http.Request) (*jwt.JSONWebToken, error)
Claims(r *http.Request, token *jwt.JSONWebToken, values ...interface{}) error
}
func InitJWTValidator(auth0Domain string, configBucket string, pemPath string, fs fileaccess.FileAccess) (*auth0.JWTValidator, error) {
// Create a configuration with the Auth0 information
auth0PEM, err := fs.ReadObject(configBucket, pemPath)
secret, err := loadPublicKey(auth0PEM)
if err != nil {
return nil, fmt.Errorf("Failed to load PEM file: %v", err.Error())
}
secretProvider := auth0.NewKeyProvider(secret)
audience := []string{apiAudience}
configuration := auth0.NewConfiguration(secretProvider, audience, "https://"+auth0Domain+"/", jose.RS256)
return auth0.NewValidator(configuration, nil), nil
// NOTE: if we have to extract the token from multiple places we can do this...
/*auth0.FromMultiple(
auth0.RequestTokenExtractorFunc(auth0.FromHeader),
auth0.RequestTokenExtractorFunc(auth0.FromParams),
))*/
}
// Extracted from https://github.com/square/go-jose/blob/master/utils.go
// loadPublicKey loads a public key from PEM/DER-encoded data.
// You can download the Auth0 pem file from `applications -> your_app -> scroll down -> Advanced Settings -> certificates -> download`
func loadPublicKey(data []byte) (interface{}, error) {
input := data
block, _ := pem.Decode(data)
if block != nil {
input = block.Bytes
}
// Try to load SubjectPublicKeyInfo
pub, err0 := x509.ParsePKIXPublicKey(input)
if err0 == nil {
return pub, nil
}
cert, err1 := x509.ParseCertificate(input)
if err1 == nil {
return cert.PublicKey, nil
}
return nil, fmt.Errorf("Public key parse error, got '%s' and '%s'", err0, err1)
}