103 lines
1.9 KiB
Go
103 lines
1.9 KiB
Go
package api
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import (
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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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)
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const (
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defaultPerPage = 100
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defaultPage = 1
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)
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const nextPageHeader = "X-Next-Page"
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type pageInfo struct {
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startIndex int
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endIndex int
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nextPage int
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}
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type searchCriterion struct {
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Search string `url:"search"`
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Status string `url:"status"`
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}
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func newSearchCriterion(query url.Values) *searchCriterion {
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if len(query) == 0 {
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return nil
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}
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search := query.Get("search")
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status := query.Get("status")
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if status == "" && search == "" {
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return nil
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}
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return &searchCriterion{Search: search, Status: status}
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}
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func (c *searchCriterion) withStatus(name string) bool {
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return c.Status == "" || strings.EqualFold(name, c.Status)
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}
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func (c *searchCriterion) searchIn(values ...string) bool {
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if c.Search == "" {
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return true
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}
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for _, v := range values {
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if strings.Contains(strings.ToLower(v), strings.ToLower(c.Search)) {
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return true
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}
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}
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return false
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}
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func pagination(request *http.Request, max int) (pageInfo, error) {
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perPage, err := getIntParam(request, "per_page", defaultPerPage)
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if err != nil {
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return pageInfo{}, err
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}
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page, err := getIntParam(request, "page", defaultPage)
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if err != nil {
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return pageInfo{}, err
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}
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startIndex := (page - 1) * perPage
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if startIndex != 0 && startIndex >= max {
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return pageInfo{}, fmt.Errorf("invalid request: page: %d, per_page: %d", page, perPage)
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}
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endIndex := startIndex + perPage
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if endIndex >= max {
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endIndex = max
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}
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nextPage := 1
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if page*perPage < max {
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nextPage = page + 1
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}
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return pageInfo{startIndex: startIndex, endIndex: endIndex, nextPage: nextPage}, nil
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}
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func getIntParam(request *http.Request, key string, defaultValue int) (int, error) {
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raw := request.URL.Query().Get(key)
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if raw == "" {
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return defaultValue, nil
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}
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value, err := strconv.Atoi(raw)
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if err != nil || value <= 0 {
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return 0, fmt.Errorf("invalid request: %s: %d", key, value)
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}
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return value, nil
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}
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