/
nyaa.go
325 lines (274 loc) · 7.4 KB
/
nyaa.go
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package nyaa
import (
"github.com/PuerkitoBio/goquery"
"github.com/docker/go-units"
"github.com/pkg/errors"
"golang.org/x/net/html"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
)
var NyaaURL = "https://nyaa.si"
var PageLimit uint = 100
func Search(search string, parameters ...SearchParameters) ([]Media, error) {
params, err := getOneParameterSet(parameters)
if err != nil {
return nil, err
}
doc, err := requestHTML(search, params)
if err != nil {
return nil, errors.Wrap(err, "error getting the nyaa page")
}
medias, err := parseSearchPageHTML(doc)
if err != nil {
return nil, errors.Wrap(err, "error parsing html")
}
return medias, nil
}
func getOneParameterSet(parameters []SearchParameters) (SearchParameters, error) {
params := SearchParameters{}
if len(parameters) == 1 {
params = parameters[0]
}
if len(parameters) > 1 {
return SearchParameters{}, errors.New("only one parameter set accepted")
}
if params.Page > PageLimit {
return params, errors.New("exceeded page limit")
}
return params, nil
}
func requestHTML(search string, params SearchParameters) (*goquery.Document, error) {
URL, err := urlForParams(search, params)
if err != nil {
return nil, errors.Wrap(err, "error creating url for search")
}
rep, err := http.Get(URL)
if err != nil {
return nil, errors.Wrap(err, "error requesting results")
}
defer rep.Body.Close()
if rep.StatusCode < 200 || rep.StatusCode >= 300 {
return nil, errors.Errorf("non-OK HTTP status code: %d %s", rep.StatusCode, rep.Status)
}
doc, err := goquery.NewDocumentFromReader(rep.Body)
if err != nil {
return nil, errors.Wrap(err, "error parsing response html")
}
return doc, nil
}
func urlForParams(search string, parameters SearchParameters) (string, error) {
var baseURL string
if parameters.Proxy != "" {
baseURL = parameters.Proxy
} else {
baseURL = NyaaURL
}
if parameters.User != "" {
baseURL += "/user/" + url.PathEscape(parameters.User)
}
URL, err := url.Parse(baseURL)
if err != nil {
return "", errors.Wrap(err, "error parsing nyaa url")
}
query := URL.Query()
query.Set("f", strconv.FormatInt(int64(parameters.Filter), 10))
query.Set("c", string(parameters.Category))
query.Set("q", search)
query.Set("s", string(parameters.SortBy))
query.Set("o", string(parameters.SortOrder))
query.Set("p", strconv.FormatInt(int64(parameters.Page), 10))
URL.RawQuery = query.Encode()
return URL.String(), nil
}
func parseSearchPageHTML(doc *goquery.Document) ([]Media, error) {
selection := doc.Find(".torrent-list tbody tr")
medias := make([]Media, selection.Length())
errChan := make(chan error)
group := sync.WaitGroup{}
group.Add(selection.Length())
doneChan := make(chan struct{})
go func() {
group.Wait()
doneChan <- struct{}{}
}()
go func() {
selection.Each(func(i int, selection *goquery.Selection) {
media, err := parseMediaElement(selection)
if err != nil {
errChan <- errors.Wrap(err, "error parsing media element")
return
}
medias[i] = media
group.Done()
})
}()
select {
case err := <-errChan:
return nil, err
case <-doneChan:
}
return medias, nil
}
func parseMediaElement(elem *goquery.Selection) (Media, error) {
media := Media{}
links := elem.Find("td a:not(.comments)").Nodes
err := parseMediaElementLinks(links, &media)
if err != nil {
return media, err
}
nodes := elem.Find("td").Nodes
err = parseMediaElementTexts(nodes, &media)
if err != nil {
return media, err
}
err = parseMediaElementTimestamp(nodes, &media)
if err != nil {
return media, err
}
err = parseMediaElementCommentCount(elem, &media)
if err != nil {
return media, err
}
return media, nil
}
func parseMediaElementLinks(links []*html.Node, media *Media) error {
if len(links) != 4 {
return errors.Errorf("unexpected layout: expected 4 links, got %d", len(links))
}
href, err := getLinkHref(links, 0)
if err != nil {
return err
}
media.Category = hrefToCategory(href)
href, err = getLinkHref(links, 1)
if err != nil {
return err
}
id, err := hrefToID(href)
if err != nil {
return errors.Wrap(err, "error parsing ID")
}
media.ID = id
title, ok := getAttributeValueByKey(links[1], "title")
if !ok {
return errors.New("unexpected layout: link 1 does not have a title")
}
media.Name = title
href, err = getLinkHref(links, 2)
if err != nil {
return err
}
media.Torrent = href
href, err = getLinkHref(links, 3)
if err != nil {
return err
}
media.Magnet = href
return nil
}
func getLinkHref(links []*html.Node, index int) (string, error) {
href, ok := getAttributeValueByKey(links[index], "href")
if !ok {
return "", errors.Errorf("unexpected layout: link %d does not have an href", index)
}
return href, nil
}
func parseMediaElementTexts(nodes []*html.Node, media *Media) error {
if len(nodes) != 8 {
return errors.Errorf("unexpected layout: expected 8 nodes, got %d", len(nodes))
}
data, err := getFirstChildText(nodes, 3)
if err != nil {
return err
}
size, err := units.FromHumanSize(data)
if err != nil {
return errors.Wrap(err, "error parsing size")
}
media.Size = uint64(size)
data, err = getFirstChildText(nodes, 5)
if err != nil {
return err
}
seeders, err := strconv.Atoi(data)
if err != nil {
return errors.Wrap(err, "error parsing se")
}
media.Seeders = uint(seeders)
data, err = getFirstChildText(nodes, 6)
if err != nil {
return err
}
leechers, err := strconv.Atoi(data)
if err != nil {
return errors.Wrap(err, "error parsing leechers")
}
media.Leechers = uint(leechers)
data, err = getFirstChildText(nodes, 7)
if err != nil {
return err
}
downloads, err := strconv.Atoi(data)
if err != nil {
return errors.Wrap(err, "error parsing downloads")
}
media.Downloads = uint(downloads)
return nil
}
func getFirstChildText(nodes []*html.Node, index int) (string, error) {
child := nodes[index].FirstChild
if child == nil || child.Type != html.TextNode {
return "", errors.Errorf("unexpected layout: expected node %d to have a text first child", index)
}
return child.Data, nil
}
func parseMediaElementTimestamp(nodes []*html.Node, media *Media) error {
timestamp, ok := getAttributeValueByKey(nodes[4], "data-timestamp")
if !ok {
return errors.New("unexpected layout: expected node 5 to have a data-timestamp")
}
timestampInt, err := strconv.Atoi(timestamp)
if err != nil {
return errors.Wrap(err, "error parsing timestamp")
}
media.Date = time.Unix(int64(timestampInt), 0)
return nil
}
func parseMediaElementCommentCount(elem *goquery.Selection, media *Media) error {
nodes := elem.Find(".comments").Nodes
if len(nodes) == 0 {
return nil
}
if len(nodes) > 1 {
return errors.New("found more than one comments element")
}
textChild := nodes[0].LastChild
if textChild == nil || textChild.Type != html.TextNode {
return errors.New("unexpected layout: expected comments elem to have a text last child")
}
commentCount, err := strconv.Atoi(textChild.Data)
if err != nil {
return errors.Wrap(err, "error parsing comment count")
}
media.CommentCount = uint(commentCount)
return nil
}
func getAttributeValueByKey(node *html.Node, key string) (string, bool) {
for _, attribute := range node.Attr {
if attribute.Key == key {
return attribute.Val, true
}
}
return "", false
}
func hrefToCategory(href string) Category {
return Category(strings.TrimPrefix(href, "/?c="))
}
func hrefToID(href string) (uint, error) {
id, err := strconv.Atoi(strings.TrimPrefix(href, "/view/"))
return uint(id), err
}