67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
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package api
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import (
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"net/http"
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"reflect"
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"strconv"
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)
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const (
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defaultPageSize = 10
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maxPageSize = 100
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)
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type pageParams struct {
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Page int
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PageSize int
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Offset int
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}
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// parsePageParams reads page + pageSize (or limit) from the query string.
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// Defaults: page=1, pageSize=10. pageSize is capped at 100.
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func parsePageParams(r *http.Request) pageParams {
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page := 1
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pageSize := defaultPageSize
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if v := r.URL.Query().Get("page"); v != "" {
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if n, err := strconv.Atoi(v); err == nil && n > 0 {
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page = n
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}
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}
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if v := r.URL.Query().Get("pageSize"); v != "" {
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if n, err := strconv.Atoi(v); err == nil && n > 0 {
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pageSize = n
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}
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} else if v := r.URL.Query().Get("limit"); v != "" {
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if n, err := strconv.Atoi(v); err == nil && n > 0 {
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pageSize = n
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}
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}
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if pageSize > maxPageSize {
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pageSize = maxPageSize
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}
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return pageParams{
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Page: page,
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PageSize: pageSize,
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Offset: (page - 1) * pageSize,
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}
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}
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func writePage(w http.ResponseWriter, items any, total int64, p pageParams) {
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if items == nil {
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items = []any{}
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} else {
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v := reflect.ValueOf(items)
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if v.Kind() == reflect.Slice && v.IsNil() {
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items = reflect.MakeSlice(v.Type(), 0, 0).Interface()
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}
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}
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writeJSON(w, http.StatusOK, map[string]any{
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"items": items,
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"total": total,
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"page": p.Page,
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"pageSize": p.PageSize,
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})
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}
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