GoBlog/utils.go

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package main
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import (
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"io"
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"math/rand"
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"net/http"
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"net/url"
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"sort"
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"strings"
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"time"
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"github.com/PuerkitoBio/goquery"
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"github.com/araddon/dateparse"
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)
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type requestContextKey string
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func urlize(str string) string {
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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('-')
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}
}
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return sb.String()
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}
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func sortedStrings(s []string) []string {
sort.Slice(s, func(i, j int) bool {
return strings.ToLower(s[i]) < strings.ToLower(s[j])
})
return s
}
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func generateRandomString(chars int) string {
rand.Seed(time.Now().UnixNano())
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letters := []rune("abcdefghijklmnopqrstuvwxyz")
b := make([]rune, chars)
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for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}
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func isAllowedHost(r *http.Request, hosts ...string) bool {
if r.URL == nil {
return false
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}
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
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}
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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)
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}
})
links, err = resolveURLReferences(baseURL, links...)
return 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
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}
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func unescapedPath(p string) string {
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if u, err := url.PathUnescape(p); err == nil {
return u
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}
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return p
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}
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func slashIfEmpty(s string) string {
if s == "" {
return "/"
}
return s
}
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type stringGroup struct {
Identifier string
Strings []string
}
func groupStrings(toGroup []string) []stringGroup {
stringMap := map[string][]string{}
for _, s := range toGroup {
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first := strings.ToUpper(strings.Split(s, "")[0])
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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
}
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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
}