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fp-go/http/headers/headers.go

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// Copyright (c) 2023 IBM Corp.
// All rights reserved.
//
// 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"
"net/textproto"
A "github.com/IBM/fp-go/array"
F "github.com/IBM/fp-go/function"
L "github.com/IBM/fp-go/optics/lens"
LA "github.com/IBM/fp-go/optics/lens/array"
LRG "github.com/IBM/fp-go/optics/lens/record/generic"
RG "github.com/IBM/fp-go/record/generic"
)
// HTTP headers
const (
Accept = "Accept"
Authorization = "Authorization"
ContentType = "Content-Type"
ContentLength = "Content-Length"
)
var (
// Monoid is a [M.Monoid] to concatenate [http.Header] maps
Monoid = RG.UnionMonoid[http.Header](A.Semigroup[string]())
// AtValues is a [L.Lens] that focusses on the values of a header
AtValues = F.Flow2(
textproto.CanonicalMIMEHeaderKey,
LRG.AtRecord[http.Header, []string],
)
composeHead = F.Pipe1(
LA.AtHead[string](),
L.ComposeOptions[http.Header, string](A.Empty[string]()),
)
// AtValue is a [L.Lens] that focusses on first value of a header
AtValue = F.Flow2(
AtValues,
composeHead,
)
)