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package main
import (
_url "net/url"
"strings"
log "github.com/sirupsen/logrus"
"regexp"
)
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 {
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
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
}
}
match, err = regexp.MatchString("youtube://", url)
if err != nil {
log.Fatal(err)
}
if match {
r := regexp.MustCompile("youtube://")
url = r.ReplaceAllString(url, "https://")
}
match, err = regexp.MatchString("youtu.be/", url)
if err != nil {
log.Fatal(err)
}
if match {
log.Debug("normalize: ", "youtu.be ", url)
/**
* remove tracking param "si"
*/
url = _removeParam(url, "si")
url = _removeParam(url, "feature")
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=")
}
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")
url = _removeParam(url, "feature")
r := regexp.MustCompile("/m.youtube.com/")
url = r.ReplaceAllString(url, "/www.youtube.com/")
}
match, err = regexp.MatchString("/m.imdb.com/", url)
if err != nil {
log.Fatal(err)
}
if match {
log.Debug("normalize: ", "m.imdb.com ", url)
/**
* remove tracking param "si"
*/
url = _removeParam(url, "si")
url = _removeParam(url, "feature")
r := regexp.MustCompile("/m.imdb.com/")
url = r.ReplaceAllString(url, "/www.imdb.com")
}
/*
match, err = regexp.MatchString("m.wikipedia.org", url)
if err != nil {
log.Fatal(err)
}
if match {
r := regexp.MustCompile("m.wikipedia.org")
url = r.ReplaceAllString(url, "wikipedia.org")
}
*/
/**
* 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")
u, err = _url.Parse(url)
if err != nil {
log.Fatal(err)
}
/**
* 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
*/
if ! strings.HasPrefix(u.Host, "www.") {
u.Host = "www." + u.Host
}
url = u.String()
return url
}
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