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sitemap.go
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sitemap.go
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package sitemap
import (
"encoding/xml"
"errors"
"io/ioutil"
"net/http"
"time"
)
// Index is a structure of <sitemapindex>
type Index struct {
XMLName xml.Name `xml:"sitemapindex"`
Sitemap []parts `xml:"sitemap"`
}
// parts is a structure of <sitemap> in <sitemapindex>
type parts struct {
Loc string `xml:"loc"`
LastMod string `xml:"lastmod"`
}
// Sitemap is a structure of <sitemap>
type Sitemap struct {
XMLName xml.Name `xml:"urlset"`
URL []URL `xml:"url"`
}
// URL is a structure of <url> in <sitemap>
type URL struct {
Loc string `xml:"loc"`
LastMod string `xml:"lastmod"`
ChangeFreq string `xml:"changefreq"`
Priority float32 `xml:"priority"`
}
// fetch is page acquisition function
var fetch = func(URL string) ([]byte, error) {
var body []byte
res, err := http.Get(URL)
if err != nil {
return body, err
}
defer res.Body.Close()
body, err = ioutil.ReadAll(res.Body)
if err != nil {
return body, err
}
return body, err
}
// Time interval to be used in Index.get
var interval = time.Second
// Get sitemap data from URL
func Get(url string) (Sitemap, error) {
data, err := fetch(url)
if err != nil {
return Sitemap{}, err
}
index, indexErr := ParseIndex(data)
sitemap, sitemapErr := Parse(data)
if indexErr != nil && sitemapErr != nil {
err = errors.New("URL is not a sitemap or sitemapindex")
return Sitemap{}, err
}
if indexErr == nil {
sitemap, err = index.get(data)
if err != nil {
return Sitemap{}, err
}
}
return sitemap, err
}
// Get Sitemap data from sitemapindex file
func (s *Index) get(data []byte) (Sitemap, error) {
index, err := ParseIndex(data)
if err != nil {
return Sitemap{}, err
}
var sitemap Sitemap
for _, s := range index.Sitemap {
time.Sleep(interval)
data, err := fetch(s.Loc)
if err != nil {
return sitemap, err
}
err = xml.Unmarshal(data, &sitemap)
if err != nil {
return sitemap, err
}
}
return sitemap, err
}
// Parse create Sitemap data from text
func Parse(data []byte) (Sitemap, error) {
var sitemap Sitemap
err := xml.Unmarshal(data, &sitemap)
return sitemap, err
}
// ParseIndex create Index data from text
func ParseIndex(data []byte) (Index, error) {
var index Index
err := xml.Unmarshal(data, &index)
return index, err
}
// SetInterval change Time interval to be used in Index.get
func SetInterval(time time.Duration) {
interval = time
}
// SetFetch change fetch closure
func SetFetch(f func(url string) ([]byte, error)) {
fetch = f
}