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pagination.go
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pagination.go
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// Copyright © 2022 Ory Corp
// SPDX-License-Identifier: Apache-2.0
package pagepagination
import (
"fmt"
"net/http"
"net/url"
"strconv"
"github.com/ory/x/pagination"
)
type PagePaginator struct {
MaxItems int
DefaultItems int
}
func (p *PagePaginator) defaults() {
if p.MaxItems == 0 {
p.MaxItems = 1000
}
if p.DefaultItems == 0 {
p.DefaultItems = 250
}
}
// ParsePagination parses limit and page from *http.Request with given limits and defaults.
func (p *PagePaginator) ParsePagination(r *http.Request) (page, itemsPerPage int) {
p.defaults()
if offsetParam := r.URL.Query().Get("page"); offsetParam == "" {
page = 0
} else {
if offset, err := strconv.ParseInt(offsetParam, 10, 0); err != nil {
page = 0
} else {
page = int(offset)
}
}
if limitParam := r.URL.Query().Get("per_page"); limitParam == "" {
itemsPerPage = p.DefaultItems
} else {
if limit, err := strconv.ParseInt(limitParam, 10, 0); err != nil {
itemsPerPage = p.DefaultItems
} else {
itemsPerPage = int(limit)
}
}
if itemsPerPage > p.MaxItems {
itemsPerPage = p.MaxItems
}
if itemsPerPage < 1 {
itemsPerPage = 1
}
if page < 0 {
page = 0
}
return
}
func header(u *url.URL, rel string, limit, offset int64) string {
q := u.Query()
q.Set("per_page", fmt.Sprintf("%d", limit))
q.Set("page", fmt.Sprintf("%d", offset/limit))
u.RawQuery = q.Encode()
return fmt.Sprintf("<%s>; rel=\"%s\"", u.String(), rel)
}
func PaginationHeader(w http.ResponseWriter, u *url.URL, total int64, page, itemsPerPage int) {
pagination.HeaderWithFormatter(w, u, total, page, itemsPerPage, header)
}