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rule_impl.go
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rule_impl.go
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// Copyright 2022 Dimitrij Drus <dadrus@gmx.de>
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package rules
import (
"fmt"
"net/url"
"slices"
"strings"
"github.com/rs/zerolog"
"github.com/dadrus/heimdall/internal/heimdall"
"github.com/dadrus/heimdall/internal/rules/config"
"github.com/dadrus/heimdall/internal/rules/patternmatcher"
"github.com/dadrus/heimdall/internal/rules/rule"
)
type ruleImpl struct {
id string
encodedSlashesHandling config.EncodedSlashesHandling
urlMatcher patternmatcher.PatternMatcher
backend *config.Backend
methods []string
srcID string
isDefault bool
hash []byte
sc compositeSubjectCreator
sh compositeSubjectHandler
fi compositeSubjectHandler
eh compositeErrorHandler
}
func (r *ruleImpl) Execute(ctx heimdall.Context) (rule.Backend, error) {
logger := zerolog.Ctx(ctx.AppContext())
if r.isDefault {
logger.Info().Msg("Executing default rule")
} else {
logger.Info().Str("_src", r.srcID).Str("_id", r.id).Msg("Executing rule")
}
// authenticators
sub, err := r.sc.Execute(ctx)
if err != nil {
return nil, r.eh.Execute(ctx, err)
}
// authorizers & contextualizer
if err = r.sh.Execute(ctx, sub); err != nil {
return nil, r.eh.Execute(ctx, err)
}
// finalizers
if err = r.fi.Execute(ctx, sub); err != nil {
return nil, r.eh.Execute(ctx, err)
}
var upstream rule.Backend
if r.backend != nil {
targetURL := *ctx.Request().URL
if r.encodedSlashesHandling == config.EncodedSlashesOn && len(targetURL.RawPath) != 0 {
targetURL.RawPath = ""
}
upstream = &backend{
targetURL: r.backend.CreateURL(&targetURL),
}
}
return upstream, nil
}
func (r *ruleImpl) MatchesURL(requestURL *url.URL) bool {
var path string
switch r.encodedSlashesHandling {
case config.EncodedSlashesOff:
if strings.Contains(requestURL.RawPath, "%2F") {
return false
}
path = requestURL.Path
case config.EncodedSlashesNoDecode:
if len(requestURL.RawPath) != 0 {
path = strings.ReplaceAll(requestURL.RawPath, "%2F", "$$$escaped-slash$$$")
path, _ = url.PathUnescape(path)
path = strings.ReplaceAll(path, "$$$escaped-slash$$$", "%2F")
break
}
fallthrough
default:
path = requestURL.Path
}
return r.urlMatcher.Match(fmt.Sprintf("%s://%s%s", requestURL.Scheme, requestURL.Host, path))
}
func (r *ruleImpl) MatchesMethod(method string) bool { return slices.Contains(r.methods, method) }
func (r *ruleImpl) ID() string { return r.id }
func (r *ruleImpl) SrcID() string { return r.srcID }
type backend struct {
targetURL *url.URL
}
func (b *backend) URL() *url.URL { return b.targetURL }