traefik/pkg/responsemodifiers/response_modifier.go

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package responsemodifiers
import (
"context"
"net/http"
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"github.com/containous/traefik/v2/pkg/config/runtime"
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)
// NewBuilder creates a builder.
func NewBuilder(configs map[string]*runtime.MiddlewareInfo) *Builder {
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return &Builder{configs: configs}
}
// Builder holds builder configuration.
type Builder struct {
configs map[string]*runtime.MiddlewareInfo
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}
// Build Builds the response modifier.
func (f *Builder) Build(ctx context.Context, names []string) func(*http.Response) error {
var modifiers []func(*http.Response) error
for _, middleName := range names {
if conf, ok := f.configs[middleName]; ok {
if conf.Headers != nil {
getLogger(ctx, middleName, "Headers").Debug("Creating Middleware (ResponseModifier)")
modifiers = append(modifiers, buildHeaders(conf.Headers))
} else if conf.Chain != nil {
getLogger(ctx, middleName, "Chain").Debug("Creating Middleware (ResponseModifier)")
modifiers = append(modifiers, f.Build(ctx, conf.Chain.Middlewares))
}
}
}
if len(modifiers) > 0 {
return func(resp *http.Response) error {
for i := len(modifiers); i > 0; i-- {
err := modifiers[i-1](resp)
if err != nil {
return err
}
}
return nil
}
}
return func(response *http.Response) error { return nil }
}