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builder.go
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builder.go
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// Copyright Istio Authors
//
// 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 headers
import (
"net/http"
)
// Builder for HTTP headers.
type Builder struct {
headers http.Header
}
// New Builder for HTTP headers.
func New() *Builder {
return &Builder{
headers: make(http.Header),
}
}
// Get returns the current value for the key.
func (b *Builder) Get(key string) string {
return b.headers.Get(key)
}
// With sets the given header value.
func (b *Builder) With(key, value string) *Builder {
b.headers.Set(key, value)
return b
}
// WithAuthz sets the Authorization header with the given token.
func (b *Builder) WithAuthz(token string) *Builder {
if token != "" {
return b.With(Authorization, "Bearer "+token)
}
return b
}
// WithHost sets the Host header to the given value.
func (b *Builder) WithHost(host string) *Builder {
return b.With(Host, host)
}
// WithXForwardedFor sets the origin IP of the request.
func (b *Builder) WithXForwardedFor(ip string) *Builder {
return b.With(XForwardedFor, ip)
}
func (b *Builder) Build() http.Header {
if b == nil {
return nil
}
return b.headers
}
func (b *Builder) BuildTo(out http.Header) {
if b == nil {
return
}
for k, v := range b.headers {
out[k] = v
}
}