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// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package scraper // import "miniflux.app/v2/internal/reader/scraper"
import (
"errors"
"fmt"
"io"
"log/slog"
"strings"
"miniflux.app/v2/internal/config"
"miniflux.app/v2/internal/http/client"
"miniflux.app/v2/internal/reader/readability"
"miniflux.app/v2/internal/urllib"
"github.com/PuerkitoBio/goquery"
)
// Fetch downloads a web page and returns relevant contents.
func Fetch(websiteURL, rules, userAgent string, cookie string, allowSelfSignedCertificates, useProxy bool) (string, error) {
clt := client.NewClientWithConfig(websiteURL, config.Opts)
clt.WithUserAgent(userAgent)
clt.WithCookie(cookie)
if useProxy {
clt.WithProxy()
}
clt.AllowSelfSignedCertificates = allowSelfSignedCertificates
response, err := clt.Get()
if err != nil {
return "", err
}
if response.HasServerFailure() {
return "", errors.New("scraper: unable to download web page")
}
if !isAllowedContentType(response.ContentType) {
return "", fmt.Errorf("scraper: this resource is not a HTML document (%s)", response.ContentType)
}
if err = response.EnsureUnicodeBody(); err != nil {
return "", err
}
// The entry URL could redirect somewhere else.
sameSite := urllib.Domain(websiteURL) == urllib.Domain(response.EffectiveURL)
websiteURL = response.EffectiveURL
if rules == "" {
rules = getPredefinedScraperRules(websiteURL)
}
var content string
if sameSite && rules != "" {
slog.Debug("Extracting content with custom rules",
"url", websiteURL,
"rules", rules,
)
content, err = scrapContent(response.Body, rules)
} else {
slog.Debug("Extracting content with readability",
"url", websiteURL,
)
content, err = readability.ExtractContent(response.Body)
}
if err != nil {
return "", err
}
return content, nil
}
func scrapContent(page io.Reader, rules string) (string, error) {
document, err := goquery.NewDocumentFromReader(page)
if err != nil {
return "", err
}
contents := ""
document.Find(rules).Each(func(i int, s *goquery.Selection) {
var content string
content, _ = goquery.OuterHtml(s)
contents += content
})
return contents, nil
}
func getPredefinedScraperRules(websiteURL string) string {
urlDomain := urllib.Domain(websiteURL)
for domain, rules := range predefinedRules {
if strings.Contains(urlDomain, domain) {
return rules
}
}
return ""
}
func isAllowedContentType(contentType string) bool {
contentType = strings.ToLower(contentType)
return strings.HasPrefix(contentType, "text/html") ||
strings.HasPrefix(contentType, "application/xhtml+xml")
}
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