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package main
import (
"io"
"net/http"
"net/url"
"sort"
"strings"
"github.com/PuerkitoBio/goquery"
"github.com/araddon/dateparse"
"github.com/thoas/go-funk"
)
type requestContextKey string
func urlize(str string) string {
var sb strings.Builder
for _, c := range strings.ToLower(str) {
if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0' && c <= '9' {
_, _ = sb.WriteRune(c)
} else if c == ' ' {
_, _ = sb.WriteRune('-')
}
}
return sb.String()
}
func sortedStrings(s []string) []string {
sort.Slice(s, func(i, j int) bool {
return strings.ToLower(s[i]) < strings.ToLower(s[j])
})
return s
}
const randomLetters = "abcdefghijklmnopqrstuvwxyz"
func generateRandomString(chars int) string {
return funk.RandomString(chars, []rune(randomLetters))
}
func isAllowedHost(r *http.Request, hosts ...string) bool {
if r.URL == nil {
return false
}
rh := r.URL.Host
switch r.URL.Scheme {
case "http":
rh = strings.TrimSuffix(rh, ":80")
case "https":
rh = strings.TrimSuffix(rh, ":443")
}
for _, host := range hosts {
if rh == host {
return true
}
}
return false
}
func isAbsoluteURL(s string) bool {
if !strings.HasPrefix(s, "https://") && !strings.HasPrefix(s, "http://") {
return false
}
if _, err := url.Parse(s); err != nil {
return false
}
return true
}
func allLinksFromHTML(r io.Reader, baseURL string) ([]string, error) {
doc, err := goquery.NewDocumentFromReader(r)
if err != nil {
return nil, err
}
links := []string{}
doc.Find("a[href]").Each(func(_ int, item *goquery.Selection) {
if href, exists := item.Attr("href"); exists {
links = append(links, href)
}
})
links, err = resolveURLReferences(baseURL, links...)
return funk.UniqString(links), err
}
func resolveURLReferences(base string, refs ...string) ([]string, error) {
b, err := url.Parse(base)
if err != nil {
return nil, err
}
var urls []string
for _, r := range refs {
u, err := url.Parse(r)
if err != nil {
continue
}
urls = append(urls, b.ResolveReference(u).String())
}
return urls, nil
}
func unescapedPath(p string) string {
if u, err := url.PathUnescape(p); err == nil {
return u
}
return p
}
func slashIfEmpty(s string) string {
if s == "" {
return "/"
}
return s
}
type stringGroup struct {
Identifier string
Strings []string
}
func groupStrings(toGroup []string) []stringGroup {
stringMap := map[string][]string{}
for _, s := range toGroup {
first := strings.ToUpper(string([]rune(s)[0]))
stringMap[first] = append(stringMap[first], s)
}
stringGroups := []stringGroup{}
for key, sa := range stringMap {
stringGroups = append(stringGroups, stringGroup{
Identifier: key,
Strings: sortedStrings(sa),
})
}
sort.Slice(stringGroups, func(i, j int) bool {
return strings.ToLower(stringGroups[i].Identifier) < strings.ToLower(stringGroups[j].Identifier)
})
return stringGroups
}
func toLocalSafe(s string) string {
d, _ := toLocal(s)
return d
}
func toLocal(s string) (string, error) {
if s == "" {
return "", nil
}
d, err := dateparse.ParseLocal(s)
if err != nil {
return "", err
}
return d.Local().String(), nil
}
func dateFormat(date string, format string) string {
d, err := dateparse.ParseLocal(date)
if err != nil {
return ""
}
return d.Local().Format(format)
}
type stringPair struct {
first, second string
}