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// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package rewrite // import "miniflux.app/v2/internal/reader/rewrite"
import (
"log/slog"
"strconv"
"strings"
"text/scanner"
"miniflux.app/v2/internal/model"
"miniflux.app/v2/internal/urllib"
"golang.org/x/text/cases"
"golang.org/x/text/language"
)
type rule struct {
name string
args []string
}
func (rule rule) applyRule(entryURL string, entry *model.Entry) {
switch rule.name {
case "add_image_title":
entry.Content = addImageTitle(entryURL, entry.Content)
case "add_mailto_subject":
entry.Content = addMailtoSubject(entryURL, entry.Content)
case "add_dynamic_image":
entry.Content = addDynamicImage(entryURL, entry.Content)
case "add_dynamic_iframe":
entry.Content = addDynamicIframe(entryURL, entry.Content)
case "add_youtube_video":
entry.Content = addYoutubeVideo(entryURL, entry.Content)
case "add_invidious_video":
entry.Content = addInvidiousVideo(entryURL, entry.Content)
case "add_youtube_video_using_invidious_player":
entry.Content = addYoutubeVideoUsingInvidiousPlayer(entryURL, entry.Content)
case "add_youtube_video_from_id":
entry.Content = addYoutubeVideoFromId(entry.Content)
case "add_pdf_download_link":
entry.Content = addPDFLink(entryURL, entry.Content)
case "nl2br":
entry.Content = strings.ReplaceAll(entry.Content, "\n", "<br>")
case "convert_text_link", "convert_text_links":
entry.Content = replaceTextLinks(entry.Content)
case "fix_medium_images":
entry.Content = fixMediumImages(entryURL, entry.Content)
case "use_noscript_figure_images":
entry.Content = useNoScriptImages(entryURL, entry.Content)
case "replace":
// Format: replace("search-term"|"replace-term")
if len(rule.args) >= 2 {
entry.Content = replaceCustom(entry.Content, rule.args[0], rule.args[1])
} else {
slog.Warn("Cannot find search and replace terms for replace rule",
slog.Any("rule", rule),
slog.String("entry_url", entryURL),
)
}
case "replace_title":
// Format: replace_title("search-term"|"replace-term")
if len(rule.args) >= 2 {
entry.Title = replaceCustom(entry.Title, rule.args[0], rule.args[1])
} else {
slog.Warn("Cannot find search and replace terms for replace_title rule",
slog.Any("rule", rule),
slog.String("entry_url", entryURL),
)
}
case "remove":
// Format: remove("#selector > .element, .another")
if len(rule.args) >= 1 {
entry.Content = removeCustom(entry.Content, rule.args[0])
} else {
slog.Warn("Cannot find selector for remove rule",
slog.Any("rule", rule),
slog.String("entry_url", entryURL),
)
}
case "add_castopod_episode":
entry.Content = addCastopodEpisode(entryURL, entry.Content)
case "base64_decode":
selector := "body"
if len(rule.args) >= 1 {
selector = rule.args[0]
}
entry.Content = applyFuncOnTextContent(entry.Content, selector, decodeBase64Content)
case "add_hn_links_using_hack":
entry.Content = addHackerNewsLinksUsing(entry.Content, "hack")
case "add_hn_links_using_opener":
entry.Content = addHackerNewsLinksUsing(entry.Content, "opener")
case "parse_markdown":
entry.Content = parseMarkdown(entry.Content)
case "remove_tables":
entry.Content = removeTables(entry.Content)
case "remove_clickbait":
entry.Title = cases.Title(language.English).String(strings.ToLower(entry.Title))
}
}
// Rewriter modify item contents with a set of rewriting rules.
func Rewriter(entryURL string, entry *model.Entry, customRewriteRules string) {
rulesList := getPredefinedRewriteRules(entryURL)
if customRewriteRules != "" {
rulesList = customRewriteRules
}
rules := parseRules(rulesList)
rules = append(rules, rule{name: "add_pdf_download_link"})
slog.Debug("Rewrite rules applied",
slog.Any("rules", rules),
slog.String("entry_url", entryURL),
)
for _, rule := range rules {
rule.applyRule(entryURL, entry)
}
}
func parseRules(rulesText string) (rules []rule) {
scan := scanner.Scanner{Mode: scanner.ScanIdents | scanner.ScanStrings}
scan.Init(strings.NewReader(rulesText))
for {
switch scan.Scan() {
case scanner.Ident:
rules = append(rules, rule{name: scan.TokenText()})
case scanner.String:
if l := len(rules) - 1; l >= 0 {
text, _ := strconv.Unquote(scan.TokenText())
rules[l].args = append(rules[l].args, text)
}
case scanner.EOF:
return
}
}
}
func getPredefinedRewriteRules(entryURL string) string {
urlDomain := urllib.Domain(entryURL)
for domain, rules := range predefinedRules {
if strings.Contains(urlDomain, domain) {
return rules
}
}
return ""
}
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