mirror of https://github.com/muety/wakapi.git
88 lines
1.9 KiB
Go
88 lines
1.9 KiB
Go
package utils
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import (
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"errors"
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"net/http"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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const (
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cacheMaxAgePattern = `max-age=(\d+)`
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)
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var (
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cacheMaxAgeRe *regexp.Regexp
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)
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func init() {
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cacheMaxAgeRe = regexp.MustCompile(cacheMaxAgePattern)
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}
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type PageParams struct {
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Page int `json:"page"`
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PageSize int `json:"page_size"`
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}
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func (p *PageParams) Limit() int {
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if p.PageSize < 0 {
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return 0
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}
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return p.PageSize
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}
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func (p *PageParams) Offset() int {
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if p.PageSize <= 0 {
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return 0
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}
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return (p.Page - 1) * p.PageSize
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}
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func IsNoCache(r *http.Request, cacheTtl time.Duration) bool {
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cacheControl := r.Header.Get("cache-control")
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if strings.Contains(cacheControl, "no-cache") {
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return true
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}
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if match := cacheMaxAgeRe.FindStringSubmatch(cacheControl); match != nil && len(match) > 1 {
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if maxAge, _ := strconv.Atoi(match[1]); time.Duration(maxAge)*time.Second <= cacheTtl {
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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 ParsePageParams(r *http.Request) *PageParams {
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pageParams := &PageParams{}
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page := r.URL.Query().Get("page")
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pageSize := r.URL.Query().Get("page_size")
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if p, err := strconv.Atoi(page); err == nil {
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pageParams.Page = p
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}
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if p, err := strconv.Atoi(pageSize); err == nil && pageParams.Page > 0 {
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pageParams.PageSize = p
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}
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return pageParams
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}
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func ParsePageParamsWithDefault(r *http.Request, page, size int) *PageParams {
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pageParams := ParsePageParams(r)
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if pageParams.Page == 0 {
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pageParams.Page = page
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}
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if pageParams.PageSize == 0 {
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pageParams.PageSize = size
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}
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return pageParams
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}
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func ParseUserAgent(ua string) (string, string, error) {
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re := regexp.MustCompile(`(?iU)^(?:(?:wakatime|chrome|firefox)\/(?:v?[\d+.]+|unset)\s)?(?:\((\w+)-.*\)\s.+\s)?([^\/\s]+)-wakatime\/.+$`)
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groups := re.FindAllStringSubmatch(ua, -1)
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if len(groups) == 0 || len(groups[0]) != 3 {
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return "", "", errors.New("failed to parse user agent string")
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}
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return groups[0][1], groups[0][2], nil
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}
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