129 lines
3.6 KiB
Go
129 lines
3.6 KiB
Go
package tcpmiddleware
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/rs/zerolog/log"
|
|
"github.com/traefik/traefik/v3/pkg/config/runtime"
|
|
"github.com/traefik/traefik/v3/pkg/middlewares/tcp/inflightconn"
|
|
"github.com/traefik/traefik/v3/pkg/middlewares/tcp/ipallowlist"
|
|
"github.com/traefik/traefik/v3/pkg/middlewares/tcp/ipwhitelist"
|
|
"github.com/traefik/traefik/v3/pkg/server/provider"
|
|
"github.com/traefik/traefik/v3/pkg/tcp"
|
|
)
|
|
|
|
type middlewareStackType int
|
|
|
|
const (
|
|
middlewareStackKey middlewareStackType = iota
|
|
)
|
|
|
|
// Builder the middleware builder.
|
|
type Builder struct {
|
|
configs map[string]*runtime.TCPMiddlewareInfo
|
|
}
|
|
|
|
// NewBuilder creates a new Builder.
|
|
func NewBuilder(configs map[string]*runtime.TCPMiddlewareInfo) *Builder {
|
|
return &Builder{configs: configs}
|
|
}
|
|
|
|
// BuildChain creates a middleware chain.
|
|
func (b *Builder) BuildChain(ctx context.Context, middlewares []string) *tcp.Chain {
|
|
chain := tcp.NewChain()
|
|
|
|
for _, name := range middlewares {
|
|
middlewareName := provider.GetQualifiedName(ctx, name)
|
|
|
|
chain = chain.Append(func(next tcp.Handler) (tcp.Handler, error) {
|
|
constructorContext := provider.AddInContext(ctx, middlewareName)
|
|
if midInf, ok := b.configs[middlewareName]; !ok || midInf.TCPMiddleware == nil {
|
|
return nil, fmt.Errorf("middleware %q does not exist", middlewareName)
|
|
}
|
|
|
|
var err error
|
|
if constructorContext, err = checkRecursion(constructorContext, middlewareName); err != nil {
|
|
b.configs[middlewareName].AddError(err, true)
|
|
return nil, err
|
|
}
|
|
|
|
constructor, err := b.buildConstructor(constructorContext, middlewareName)
|
|
if err != nil {
|
|
b.configs[middlewareName].AddError(err, true)
|
|
return nil, err
|
|
}
|
|
|
|
handler, err := constructor(next)
|
|
if err != nil {
|
|
b.configs[middlewareName].AddError(err, true)
|
|
return nil, err
|
|
}
|
|
|
|
return handler, nil
|
|
})
|
|
}
|
|
|
|
return &chain
|
|
}
|
|
|
|
func checkRecursion(ctx context.Context, middlewareName string) (context.Context, error) {
|
|
currentStack, ok := ctx.Value(middlewareStackKey).([]string)
|
|
if !ok {
|
|
currentStack = []string{}
|
|
}
|
|
|
|
if inSlice(middlewareName, currentStack) {
|
|
return ctx, fmt.Errorf("could not instantiate middleware %s: recursion detected in %s", middlewareName, strings.Join(append(currentStack, middlewareName), "->"))
|
|
}
|
|
|
|
return context.WithValue(ctx, middlewareStackKey, append(currentStack, middlewareName)), nil
|
|
}
|
|
|
|
func (b *Builder) buildConstructor(ctx context.Context, middlewareName string) (tcp.Constructor, error) {
|
|
config := b.configs[middlewareName]
|
|
if config == nil || config.TCPMiddleware == nil {
|
|
return nil, fmt.Errorf("invalid middleware %q configuration", middlewareName)
|
|
}
|
|
|
|
var middleware tcp.Constructor
|
|
|
|
// InFlightConn
|
|
if config.InFlightConn != nil {
|
|
middleware = func(next tcp.Handler) (tcp.Handler, error) {
|
|
return inflightconn.New(ctx, next, *config.InFlightConn, middlewareName)
|
|
}
|
|
}
|
|
|
|
// IPWhiteList
|
|
if config.IPWhiteList != nil {
|
|
log.Warn().Msg("IPWhiteList is deprecated, please use IPAllowList instead.")
|
|
|
|
middleware = func(next tcp.Handler) (tcp.Handler, error) {
|
|
return ipwhitelist.New(ctx, next, *config.IPWhiteList, middlewareName)
|
|
}
|
|
}
|
|
|
|
// IPAllowList
|
|
if config.IPAllowList != nil {
|
|
middleware = func(next tcp.Handler) (tcp.Handler, error) {
|
|
return ipallowlist.New(ctx, next, *config.IPAllowList, middlewareName)
|
|
}
|
|
}
|
|
|
|
if middleware == nil {
|
|
return nil, fmt.Errorf("invalid middleware %q configuration: invalid middleware type or middleware does not exist", middlewareName)
|
|
}
|
|
|
|
return middleware, nil
|
|
}
|
|
|
|
func inSlice(element string, stack []string) bool {
|
|
for _, value := range stack {
|
|
if value == element {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|