config.go

/*
Copyright 2015 All rights reserved.
Licensed 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 main

import (
	"errors"
	"fmt"
	"net/url"
	"regexp"
	"strings"
	"time"
)

// newDefaultConfig returns a initialized config
func newDefaultConfig() *Config {
	return &Config{
		TagData:                  make(map[string]string, 0),
		MatchClaims:              make(map[string]string, 0),
		Headers:                  make(map[string]string, 0),
		UpstreamTimeout:          time.Duration(10) * time.Second,
		UpstreamKeepaliveTimeout: time.Duration(10) * time.Second,
		CookieAccessName:         "kc-access",
		CookieRefreshName:        "kc-state",
		SecureCookie:             true,
		SkipUpstreamTLSVerify:    true,
		CrossOrigin:              CORS{},
	}
}

//
// isValid validates if the config is valid
//
func (r *Config) isValid() error {
	if r.Listen == "" {
		return errors.New("you have not specified the listening interface")
	}
	if r.TLSCertificate != "" && r.TLSPrivateKey == "" {
		return errors.New("you have not provided a private key")
	}
	if r.TLSPrivateKey != "" && r.TLSCertificate == "" {
		return errors.New("you have not provided a certificate file")
	}
	if r.TLSCertificate != "" && !fileExists(r.TLSCertificate) {
		return fmt.Errorf("the tls certificate %s does not exist", r.TLSCertificate)
	}
	if r.TLSPrivateKey != "" && !fileExists(r.TLSPrivateKey) {
		return fmt.Errorf("the tls private key %s does not exist", r.TLSPrivateKey)
	}
	if r.TLSCaCertificate != "" && !fileExists(r.TLSCaCertificate) {
		return fmt.Errorf("the tls ca certificate file %s does not exist", r.TLSCaCertificate)
	}
	if r.TLSClientCertificate != "" && !fileExists(r.TLSClientCertificate) {
		return fmt.Errorf("the tls client certificate %s does not exist", r.TLSClientCertificate)
	}

	if r.EnableForwarding {
		if r.ClientID == "" {
			return errors.New("you have not specified the client id")
		}
		if r.DiscoveryURL == "" {
			return errors.New("you have not specified the discovery url")
		}
		if r.ForwardingUsername == "" {
			return errors.New("no forwarding username")
		}
		if r.ForwardingPassword == "" {
			return errors.New("no forwarding password")
		}
	} else {
		if r.Upstream == "" {
			return errors.New("you have not specified an upstream endpoint to proxy to")
		}
		if _, err := url.Parse(r.Upstream); err != nil {
			return fmt.Errorf("the upstream endpoint is invalid, %s", err)
		}
		// step: if the skip verification is off, we need the below
		if !r.SkipTokenVerification {
			if r.ClientID == "" {
				return errors.New("you have not specified the client id")
			}
			if r.DiscoveryURL == "" {
				return errors.New("you have not specified the discovery url")
			}
			if strings.HasSuffix(r.RedirectionURL, "/") {
				r.RedirectionURL = strings.TrimSuffix(r.RedirectionURL, "/")
			}
			if r.EnableRefreshTokens && r.EncryptionKey == "" {
				return errors.New("you have not specified a encryption key for encoding the session state")
			}
			if r.EnableRefreshTokens && (len(r.EncryptionKey) != 16 && len(r.EncryptionKey) != 32) {
				return fmt.Errorf("the encryption key (%d) must be either 16 or 32 characters for AES-128/AES-256 selection", len(r.EncryptionKey))
			}
			if !r.NoRedirects && r.SecureCookie && !strings.HasPrefix(r.RedirectionURL, "https") {
				return errors.New("the cookie is set to secure but your redirection url is non-tls")
			}
			if r.StoreURL != "" {
				if _, err := url.Parse(r.StoreURL); err != nil {
					return fmt.Errorf("the store url is invalid, error: %s", err)
				}
			}
		}
		// step: valid the resources
		for _, resource := range r.Resources {
			if err := resource.valid(); err != nil {
				return err
			}
		}
		// step: validate the claims are validate regex's
		for k, claim := range r.MatchClaims {
			if _, err := regexp.Compile(claim); err != nil {
				return fmt.Errorf("the claim matcher: %s for claim: %s is not a valid regex", claim, k)
			}
		}
	}

	return nil
}

// hasCustomSignInPage checks if there is a custom sign in  page
func (r *Config) hasCustomSignInPage() bool {
	if r.SignInPage != "" {
		return true
	}

	return false
}

// hasForbiddenPage checks if there is a custom forbidden page
func (r *Config) hasCustomForbiddenPage() bool {
	if r.ForbiddenPage != "" {
		return true
	}

	return false
}