e44b4b2540
I came across a few blogs that didn't have a link rel alternate but offered a RSS/Atom feed. This aims at solving this issue for "well known" feed urls, since these urls are often the same.
133 lines
3.4 KiB
Go
133 lines
3.4 KiB
Go
// Copyright 2017 Frédéric Guillot. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package subscription // import "miniflux.app/reader/subscription"
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import (
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"io"
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"strings"
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"miniflux.app/errors"
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"miniflux.app/http/client"
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"miniflux.app/reader/browser"
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"miniflux.app/reader/parser"
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"miniflux.app/url"
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"github.com/PuerkitoBio/goquery"
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)
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var (
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errUnreadableDoc = "Unable to analyze this page: %v"
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)
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// FindSubscriptions downloads and try to find one or more subscriptions from an URL.
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func FindSubscriptions(websiteURL, userAgent, username, password string) (Subscriptions, *errors.LocalizedError) {
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request := client.New(websiteURL)
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request.WithCredentials(username, password)
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request.WithUserAgent(userAgent)
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response, err := browser.Exec(request)
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if err != nil {
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return nil, err
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}
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body := response.BodyAsString()
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if format := parser.DetectFeedFormat(body); format != parser.FormatUnknown {
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var subscriptions Subscriptions
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subscriptions = append(subscriptions, &Subscription{
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Title: response.EffectiveURL,
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URL: response.EffectiveURL,
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Type: format,
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})
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return subscriptions, nil
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}
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subscriptions, err := parseDocument(response.EffectiveURL, strings.NewReader(body))
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if err != nil || subscriptions != nil {
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return subscriptions, err
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}
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return tryWellKnownUrls(websiteURL, userAgent, username, password)
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}
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func parseDocument(websiteURL string, data io.Reader) (Subscriptions, *errors.LocalizedError) {
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var subscriptions Subscriptions
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queries := map[string]string{
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"link[type='application/rss+xml']": "rss",
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"link[type='application/atom+xml']": "atom",
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"link[type='application/json']": "json",
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}
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doc, err := goquery.NewDocumentFromReader(data)
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if err != nil {
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return nil, errors.NewLocalizedError(errUnreadableDoc, err)
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}
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for query, kind := range queries {
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doc.Find(query).Each(func(i int, s *goquery.Selection) {
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subscription := new(Subscription)
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subscription.Type = kind
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if title, exists := s.Attr("title"); exists {
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subscription.Title = title
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} else {
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subscription.Title = "Feed"
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}
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if feedURL, exists := s.Attr("href"); exists {
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subscription.URL, _ = url.AbsoluteURL(websiteURL, feedURL)
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}
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if subscription.Title == "" {
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subscription.Title = subscription.URL
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}
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if subscription.URL != "" {
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subscriptions = append(subscriptions, subscription)
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}
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})
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}
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return subscriptions, nil
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}
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func tryWellKnownUrls(websiteURL, userAgent, username, password string) (Subscriptions, *errors.LocalizedError) {
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var subscriptions Subscriptions
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knownURLs := map[string]string{
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"/atom.xml": "atom",
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"/feed.xml": "atom",
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"/feed/": "atom",
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"/rss.xml": "rss",
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}
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lastCharacter := websiteURL[len(websiteURL)-1:]
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if lastCharacter == "/" {
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websiteURL = websiteURL[:len(websiteURL)-1]
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}
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for knownURL, kind := range knownURLs {
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fullURL, err := url.AbsoluteURL(websiteURL, knownURL)
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if err != nil {
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continue
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}
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request := client.New(fullURL)
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request.WithCredentials(username, password)
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request.WithUserAgent(userAgent)
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response, err := request.Get()
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if err != nil {
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continue
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}
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if response != nil && response.StatusCode == 200 {
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subscription := new(Subscription)
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subscription.Type = kind
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subscription.Title = fullURL
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subscription.URL = fullURL
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if subscription.URL != "" {
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subscriptions = append(subscriptions, subscription)
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}
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}
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}
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return subscriptions, nil
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}
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