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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package subscription // import "miniflux.app/reader/subscription"
import (
"fmt"
"io"
"regexp"
"strings"
"miniflux.app/config"
"miniflux.app/errors"
"miniflux.app/http/client"
"miniflux.app/reader/browser"
"miniflux.app/reader/parser"
"miniflux.app/url"
"github.com/PuerkitoBio/goquery"
)
var (
errUnreadableDoc = "Unable to analyze this page: %v"
youtubeChannelRegex = regexp.MustCompile(`youtube\.com/channel/(.*)`)
youtubeVideoRegex = regexp.MustCompile(`youtube\.com/watch\?v=(.*)`)
)
// FindSubscriptions downloads and try to find one or more subscriptions from an URL.
func FindSubscriptions(websiteURL, userAgent, cookie, username, password string, fetchViaProxy, allowSelfSignedCertificates bool) (Subscriptions, *errors.LocalizedError) {
websiteURL = findYoutubeChannelFeed(websiteURL)
websiteURL = parseYoutubeVideoPage(websiteURL)
clt := client.NewClientWithConfig(websiteURL, config.Opts)
clt.WithCredentials(username, password)
clt.WithUserAgent(userAgent)
clt.WithCookie(cookie)
clt.AllowSelfSignedCertificates = allowSelfSignedCertificates
if fetchViaProxy {
clt.WithProxy()
}
response, err := browser.Exec(clt)
if err != nil {
return nil, err
}
body := response.BodyAsString()
if format := parser.DetectFeedFormat(body); format != parser.FormatUnknown {
var subscriptions Subscriptions
subscriptions = append(subscriptions, &Subscription{
Title: response.EffectiveURL,
URL: response.EffectiveURL,
Type: format,
})
return subscriptions, nil
}
subscriptions, err := parseWebPage(response.EffectiveURL, strings.NewReader(body))
if err != nil || subscriptions != nil {
return subscriptions, err
}
return tryWellKnownUrls(websiteURL, userAgent, cookie, username, password)
}
func parseWebPage(websiteURL string, data io.Reader) (Subscriptions, *errors.LocalizedError) {
var subscriptions Subscriptions
queries := map[string]string{
"link[type='application/rss+xml']": "rss",
"link[type='application/atom+xml']": "atom",
"link[type='application/json']": "json",
}
doc, err := goquery.NewDocumentFromReader(data)
if err != nil {
return nil, errors.NewLocalizedError(errUnreadableDoc, err)
}
for query, kind := range queries {
doc.Find(query).Each(func(i int, s *goquery.Selection) {
subscription := new(Subscription)
subscription.Type = kind
if title, exists := s.Attr("title"); exists {
subscription.Title = title
} else {
subscription.Title = "Feed"
}
if feedURL, exists := s.Attr("href"); exists {
subscription.URL, _ = url.AbsoluteURL(websiteURL, feedURL)
}
if subscription.Title == "" {
subscription.Title = subscription.URL
}
if subscription.URL != "" {
subscriptions = append(subscriptions, subscription)
}
})
}
return subscriptions, nil
}
func findYoutubeChannelFeed(websiteURL string) string {
matches := youtubeChannelRegex.FindStringSubmatch(websiteURL)
if len(matches) == 2 {
return fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?channel_id=%s`, matches[1])
}
return websiteURL
}
func parseYoutubeVideoPage(websiteURL string) string {
if !youtubeVideoRegex.MatchString(websiteURL) {
return websiteURL
}
clt := client.NewClientWithConfig(websiteURL, config.Opts)
response, browserErr := browser.Exec(clt)
if browserErr != nil {
return websiteURL
}
doc, docErr := goquery.NewDocumentFromReader(response.Body)
if docErr != nil {
return websiteURL
}
if channelID, exists := doc.Find(`meta[itemprop="channelId"]`).First().Attr("content"); exists {
return fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?channel_id=%s`, channelID)
}
return websiteURL
}
func tryWellKnownUrls(websiteURL, userAgent, cookie, username, password string) (Subscriptions, *errors.LocalizedError) {
var subscriptions Subscriptions
knownURLs := map[string]string{
"/atom.xml": "atom",
"/feed.xml": "atom",
"/feed/": "atom",
"/rss.xml": "rss",
}
lastCharacter := websiteURL[len(websiteURL)-1:]
if lastCharacter == "/" {
websiteURL = websiteURL[:len(websiteURL)-1]
}
for knownURL, kind := range knownURLs {
fullURL, err := url.AbsoluteURL(websiteURL, knownURL)
if err != nil {
continue
}
clt := client.NewClientWithConfig(fullURL, config.Opts)
clt.WithCredentials(username, password)
clt.WithUserAgent(userAgent)
clt.WithCookie(cookie)
// Some websites redirects unknown URLs to the home page.
// As result, the list of known URLs is returned to the subscription list.
// We don't want the user to choose between invalid feed URLs.
clt.WithoutRedirects()
response, err := clt.Get()
if err != nil {
continue
}
if response != nil && response.StatusCode == 200 {
subscription := new(Subscription)
subscription.Type = kind
subscription.Title = fullURL
subscription.URL = fullURL
if subscription.URL != "" {
subscriptions = append(subscriptions, subscription)
}
}
}
return subscriptions, nil
}
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