mendersoftware / reporting / 743020307

// Copyright 2022 Northern.tech AS

//

//    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 http

import (

        "fmt"

        "net/url"

        "github.com/gin-gonic/gin"

)

func pageLinkHdrs(c *gin.Context, page, perPage, total int) {

        url := &url.URL{

                Path:     c.Request.URL.Path,

                RawQuery: c.Request.URL.RawQuery,

                Fragment: c.Request.URL.Fragment,

        }

        query := url.Query()

        query.Set("page", "1")

        query.Set("per_page", fmt.Sprintf("%d", perPage))

        url.RawQuery = query.Encode()

        Link := fmt.Sprintf(`<%s>;rel="first"`, url.String())

        // Previous page

        if page > 1 {

                query.Set("page", fmt.Sprintf("%d", page-1))

                url.RawQuery = query.Encode()

                Link = fmt.Sprintf(`%s, <%s>;rel="previous"`, Link, url.String())

        }

        // Next page

        if total > (perPage*page - 1) {

                query.Set("page", fmt.Sprintf("%d", page+1))

                url.RawQuery = query.Encode()

                Link = fmt.Sprintf(`%s, <%s>;rel="next"`, Link, url.String())

        }

        c.Header("Link", Link)

}