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| package filter
import (
"fmt"
"strings"
"github.com/samber/lo"
"github.com/valyala/fasthttp"
"{{{ .Package }}}/app/util"
)
const MaxRowsDefault = 100
var AllowedColumns = map[string][]string{}
type Params struct {
Key string `json:"key"`
Orderings Orderings `json:"orderings,omitempty"`
Limit int `json:"limit,omitempty"`
Offset int `json:"offset,omitempty"`
}
func ParamsWithDefaultOrdering(key string, params *Params, orderings ...*Ordering) *Params {
if params == nil {
return ParamsWithDefaultOrdering(key, &Params{Key: key}, orderings...)
}
if len(params.Orderings) == 0 {
params.Orderings = orderings
}
return params
}
func (p *Params) Sanitize(key string, defaultOrderings ...*Ordering) *Params {
if p == nil {
return &Params{Key: key, Orderings: defaultOrderings}
}
if p.Limit == 0 || p.Limit > 100000 {
p.Limit = MaxRowsDefault
}
if p.Offset < 0 {
p.Offset = 0
}
if len(p.Orderings) == 0 {
return p.CloneOrdering(defaultOrderings...)
}
return p
}
func (p *Params) WithLimit(n int) *Params {
p.Limit = n
return p
}
func (p *Params) CloneOrdering(orderings ...*Ordering) *Params {
if p == nil {
return nil
}
return &Params{Key: p.Key, Orderings: orderings, Limit: p.Limit, Offset: p.Offset}
}
func (p *Params) CloneLimit(limit int) *Params {
if p == nil {
return nil
}
return &Params{Key: p.Key, Orderings: p.Orderings, Limit: limit, Offset: p.Offset}
}
func (p *Params) HasNextPage(count int) bool {
if p == nil || p.Limit == 0 {
return false
}
return count >= (p.Offset + p.Limit)
}
func (p *Params) NextPage() *Params {
limit := p.Limit
if limit == 0 {
limit = MaxRowsDefault
}
offset := p.Offset + limit
if offset < 0 {
offset = 0
}
return &Params{Key: p.Key, Orderings: p.Orderings, Limit: p.Limit, Offset: offset}
}
func (p *Params) HasPreviousPage() bool {
return p != nil && p.Offset > 0
}
func (p *Params) PreviousPage() *Params {
limit := p.Limit
if limit == 0 {
limit = MaxRowsDefault
}
offset := p.Offset - limit
if offset < 0 {
offset = 0
}
return &Params{Key: p.Key, Orderings: p.Orderings, Limit: p.Limit, Offset: offset}
}
func (p *Params) GetOrdering(col string) *Ordering {
return lo.FindOrElse(p.Orderings, nil, func(o *Ordering) bool {
return o.Column == col
})
}
func (p *Params) OrderByString() string {
ret := lo.Map(p.Orderings, func(o *Ordering, _ int) string {
dir := ""
if !o.Asc {
dir = " desc"
}
return fmt.Sprintf("%q%s", o.Column, dir)
})
return strings.Join(ret, ", ")
}
func (p *Params) Filtered(available []string, logger util.Logger) *Params {
if available == nil {
available = AllowedColumns[p.Key]
}
if len(available) == 0 {
logger.Warnf("no columns available for [%s]", p.Key)
}
if len(available) == 1 && available[0] == "*" {
return p
}
if len(p.Orderings) > 0 {
allowed := Orderings{}
lo.ForEach(p.Orderings, func(o *Ordering, _ int) {
containsCol := lo.ContainsBy(available, func(c string) bool {
return c == o.Column
})
if containsCol {
allowed = append(allowed, o)
} else {
const msg = "no column [%s] for [%s] available in allowed columns [%s]"
logger.Warnf(msg, o.Column, p.Key, util.StringArrayOxfordComma(available, "and"))
}
})
return &Params{Key: p.Key, Orderings: allowed, Limit: p.Limit, Offset: p.Offset}
}
return p
}
func (p *Params) String() string {
ol := ""
if p.Offset > 0 {
ol += fmt.Sprintf("%d/", p.Offset)
}
if p.Limit > 0 {
ol += fmt.Sprint(p.Limit)
}
ord := lo.Map(p.Orderings, func(o *Ordering, _ int) string {
return o.String()
})
return fmt.Sprintf("%s(%s): %s", p.Key, ol, strings.Join(ord, " / "))
}
func (p *Params) ToQueryString(u *fasthttp.URI) string {
if p == nil {
return ""
}
if u == nil {
return ""
}
ret := &fasthttp.Args{}
u.QueryArgs().CopyTo(ret)
ret.Del(p.Key + ".o")
ret.Del(p.Key + ".l")
ret.Del(p.Key + ".x")
lo.ForEach(p.Orderings, func(o *Ordering, _ int) {
s := o.Column
if !o.Asc {
s += ".d"
}
ret.Add(p.Key+".o", s)
})
if p.Limit != 0 && p.Limit != 1000 {
ret.Add(p.Key+".l", fmt.Sprint(p.Limit))
}
if p.Offset > 0 {
ret.Add(p.Key+".x", fmt.Sprint(p.Offset))
}
return string(ret.QueryString())
}
|