123 lines
3.3 KiB
Go
123 lines
3.3 KiB
Go
package rewriter
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import (
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"net/http"
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proxy "forge.cadoles.com/Cadoles/go-proxy"
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"forge.cadoles.com/Cadoles/go-proxy/wildcard"
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"forge.cadoles.com/cadoles/bouncer/internal/proxy/director"
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"forge.cadoles.com/cadoles/bouncer/internal/proxy/director/layer/util"
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"forge.cadoles.com/cadoles/bouncer/internal/rule"
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ruleHTTP "forge.cadoles.com/cadoles/bouncer/internal/rule/http"
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"forge.cadoles.com/cadoles/bouncer/internal/store"
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"github.com/pkg/errors"
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"gitlab.com/wpetit/goweb/logger"
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)
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const LayerType store.LayerType = "rewriter"
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type Layer struct {
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requestRuleEngine *util.RevisionedRuleEngine[*RequestVars, *LayerOptions]
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responseRuleEngine *util.RevisionedRuleEngine[*ResponseVars, *LayerOptions]
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}
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func (l *Layer) LayerType() store.LayerType {
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return LayerType
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}
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func (l *Layer) Middleware(layer *store.Layer) proxy.Middleware {
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return func(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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options, err := fromStoreOptions(layer.Options)
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if err != nil {
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logger.Error(ctx, "could not parse layer options", logger.CapturedE(errors.WithStack(err)))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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matches := wildcard.MatchAny(r.URL.String(), options.MatchURLs...)
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if !matches {
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next.ServeHTTP(w, r)
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return
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}
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if err := l.applyRequestRules(ctx, r, layer.Revision, options); err != nil {
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var redirect *errRedirect
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if errors.As(err, &redirect) {
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http.Redirect(w, r, redirect.URL(), redirect.StatusCode())
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return
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}
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logger.Error(ctx, "could not apply request rules", logger.CapturedE(errors.WithStack(err)))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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next.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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}
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// ResponseTransformer implements director.ResponseTransformerLayer.
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func (l *Layer) ResponseTransformer(layer *store.Layer) proxy.ResponseTransformer {
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return func(r *http.Response) error {
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options, err := fromStoreOptions(layer.Options)
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if err != nil {
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return errors.WithStack(err)
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}
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matches := wildcard.MatchAny(r.Request.URL.String(), options.MatchURLs...)
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if !matches {
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return nil
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}
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ctx := r.Request.Context()
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if err := l.applyResponseRules(ctx, r, layer.Revision, options); err != nil {
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return errors.WithStack(err)
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}
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return nil
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}
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}
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func New(funcs ...OptionFunc) *Layer {
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return &Layer{
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requestRuleEngine: util.NewRevisionedRuleEngine(func(options *LayerOptions) (*rule.Engine[*RequestVars], error) {
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engine, err := rule.NewEngine[*RequestVars](
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rule.WithRules(options.Rules.Request...),
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ruleHTTP.WithRequestFuncs(),
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WithRewriterFuncs(),
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)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return engine, nil
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}),
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responseRuleEngine: util.NewRevisionedRuleEngine(func(options *LayerOptions) (*rule.Engine[*ResponseVars], error) {
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engine, err := rule.NewEngine[*ResponseVars](
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rule.WithRules(options.Rules.Response...),
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ruleHTTP.WithResponseFuncs(),
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)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return engine, nil
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}),
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}
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}
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var (
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_ director.MiddlewareLayer = &Layer{}
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_ director.ResponseTransformerLayer = &Layer{}
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)
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