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package main
import (
_url "net/url"
"strings"
log "github.com/sirupsen/logrus"
"regexp"
xhtml "golang.org/x/net/html"
)
func stripHNPrefix(title string) string {
title = strings.TrimPrefix(title, "Ask HN:")
title = strings.TrimPrefix(title, "Show HN:")
title = strings.TrimPrefix(title, "Tell HN:")
title = strings.TrimPrefix(title, "Experiment HN:")
title = strings.TrimPrefix(title, "Launch HN:")
return strings.TrimSpace(title)
}
/**
* removes given param from URL
*/
func _removeParam(url, key string) string {
u, err := _url.Parse(url)
if err != nil {
log.Fatal(err)
}
q := u.Query()
q.Del(key)
u.RawQuery = q.Encode()
return u.String()
}
func normalizeUrl(url string) string {
/**
* Redirect http:// to https://
*/
match, err := regexp.MatchString("^http://", url)
if err != nil {
log.Fatal(err)
}
if match {
log.Debug("normalize: ", "http:// ", url)
r := regexp.MustCompile("^http://")
url = r.ReplaceAllString(url, "https://")
}
/**
* add missing https:// if no scheme
* Fun fact: https://news.ycombinator.com/item?id=27351340 broke this part
*/
u, err := _url.Parse(url)
if err != nil {
log.Fatal(err)
}
if "" == u.Scheme {
if strings.HasPrefix(url, "/") {
url = "https:" + url
} else {
url = "https://" + url
}
}
/**
* Apple TV accepts youtube:// scheme
*/
match, err = regexp.MatchString("youtube://", url)
if err != nil {
log.Fatal(err)
}
if match {
r := regexp.MustCompile("youtube://")
url = r.ReplaceAllString(url, "https://")
}
/**
* Redirect youtu.be to desktop version
*/
match, err = regexp.MatchString("youtu.be/", url)
if err != nil {
log.Fatal(err)
}
if match {
log.Debug("normalize: ", "youtu.be ", url)
u, err := _url.Parse(url)
if err != nil {
log.Fatal(err)
}
q := u.Query()
q.Add("v", strings.TrimLeft(u.Path, "/"))
u.Host = "www.youtube.com"
u.Path = "watch"
u.RawQuery = q.Encode()
url = u.String()
//r := regexp.MustCompile("youtu.be/")
//url = r.ReplaceAllString(url, "youtube.com/watch?v=")
}
/**
* Redirect m.youtube.com to desktop version
*/
match, err = regexp.MatchString("/m.youtube.com/", url)
if err != nil {
log.Fatal(err)
}
if match {
log.Debug("normalize: ", "m.youtube.com ", url)
/**
* remove tracking param "si"
*/
url = _removeParam(url, "si")
r := regexp.MustCompile("/m.youtube.com/")
url = r.ReplaceAllString(url, "/www.youtube.com/")
}
/**
* Redirect m.imdb.com to desktop version
*/
match, err = regexp.MatchString("/m.imdb.com/", url)
if err != nil {
log.Fatal(err)
}
if match {
log.Debug("normalize: ", "m.imdb.com ", url)
r := regexp.MustCompile("/m.imdb.com/")
url = r.ReplaceAllString(url, "/www.imdb.com")
}
/**
* Append www. to normalize URL. exclude relative URLs starting with // since this is not recognized by Go
* Screw that, wierd edge case. Someone pasted a
*/
u, err = _url.Parse(url)
if err != nil {
log.Fatal(err)
}
if ! strings.HasPrefix(u.Host, "www.") {
u.Host = "www." + u.Host
}
url = u.String()
/**
* Redirects youtube.com/c/<name> to youtube.com/@<name>
*/
match, err = regexp.MatchString("/.youtube.com/c/", url)
if err != nil {
log.Fatal(err)
}
if match {
log.Debug("normalize: ", "youtube.com/c/ -> @ ", url)
/**
* remove tracking param "si"
*/
url = _removeParam(url, "si")
r := regexp.MustCompile("youtube.com/c/")
url = r.ReplaceAllString(url, "youtube.com/@")
}
/**
* remove tracking param "si", "feature" and "pp" from every youtube video
*/
match, err = regexp.MatchString("/www.youtube.com/", url)
if err != nil {
log.Fatal(err)
}
if match {
url = _removeParam(url, "si")
url = _removeParam(url, "pp")
url = _removeParam(url, "feature")
}
/**
* remove tracking utm_ params
*/
url = _removeParam(url, "utm_source")
url = _removeParam(url, "utm_medium")
url = _removeParam(url, "utm_campaign")
url = _removeParam(url, "utm_term")
url = _removeParam(url, "utm_content")
return url
}
func RemoveNode(root_node *xhtml.Node, remove_me *xhtml.Node) {
found_node := false
check_nodes := make(map[int]*xhtml.Node)
i := 0
// loop through siblings
for n := root_node.FirstChild; n != nil; n = n.NextSibling {
if n == remove_me {
found_node = true
n.Parent.RemoveChild(n)
}
check_nodes[i] = n
i++
}
// check if removing node is found
// if yes no need to check childs returning
// if no continue loop through childs and so on
if found_node == false {
for _, item := range check_nodes {
RemoveNode(item, remove_me)
}
}
}
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