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package app
import (
"bytes"
"context"
"log/slog"
"os"
"strings"
"text/template"
"time"
"git.neonxp.ru/posse/templates"
tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
"github.com/microcosm-cc/bluemonday"
"github.com/mmcdole/gofeed"
)
type App struct {
config *Config
telegram *tgbotapi.BotAPI
templates *template.Template
}
func New(cfg *Config) (*App, error) {
bot, err := tgbotapi.NewBotAPI(cfg.Telegram.BotToken)
if err != nil {
return nil, err
}
tpl, err := template.ParseFS(templates.Templates, "*.gotmpl")
if err != nil {
return nil, err
}
return &App{
config: cfg,
telegram: bot,
templates: tpl,
}, nil
}
func (a *App) Run(ctx context.Context) error {
ticker := time.NewTicker(a.config.RSS.CheckInterval)
if err := a.iteration(); err != nil {
slog.ErrorContext(ctx, "failed iteration", slog.Any("error", err))
}
for {
select {
case <-ctx.Done():
return nil
case <-ticker.C:
if err := a.iteration(); err != nil {
slog.ErrorContext(ctx, "failed iteration", slog.Any("error", err))
}
}
}
}
func (a *App) iteration() error {
seq, err := a.readSeqFile()
if os.IsNotExist(err) {
seq = ""
err = nil
}
if err != nil {
return err
}
items, err := a.findNewItems(seq)
if err != nil || len(items) == 0 {
return err
}
for i := len(items) - 1; i >= 0; i-- {
if err := a.processItem(items[i]); err != nil {
return err
}
if err := a.writeSeqFile(items[i].GUID); err != nil {
return err
}
}
return nil
}
func (a *App) processItem(item *gofeed.Item) error {
buf := bytes.NewBufferString("")
p := bluemonday.Policy{}
p.AllowStandardURLs()
p.AllowElements("b", "i", "code", "u", "strike", "pre", "br", "a")
p.AllowNoAttrs().Globally()
p.AllowAttrs("href").OnElements("a")
s := strings.ReplaceAll(item.Description, "<del>", "<strike>")
s = strings.ReplaceAll(s, "</del>", "</strike>")
s = strings.ReplaceAll(s, "<h1", "<b")
s = strings.ReplaceAll(s, "</h1>", "</b>")
s = strings.ReplaceAll(s, "<h2", "<b")
s = strings.ReplaceAll(s, "</h2>", "</b>")
s = strings.ReplaceAll(s, "<br />", "\n")
s = strings.ReplaceAll(s, "<p>", "")
s = strings.ReplaceAll(s, "</p>", "")
item.Content = p.Sanitize(s)
if err := a.templates.ExecuteTemplate(buf, "telegram", item); err != nil {
return err
}
str := ""
str2 := buf.String()
for str != str2 {
str = str2
str2 = strings.ReplaceAll(str, "\n\n", "\n")
str2 = strings.ReplaceAll(str2, " ", " ")
str2 = strings.Trim(str2, " \t\n")
}
for _, group := range a.config.Telegram.TargetGroups {
switch {
case item.Image != nil:
msg := tgbotapi.NewPhoto(group, tgbotapi.FileURL(item.Image.URL))
msg.ParseMode = tgbotapi.ModeHTML
msg.Caption = str
if _, err := a.telegram.Send(msg); err != nil {
return err
}
default:
msg := tgbotapi.NewMessage(group, str)
msg.ParseMode = tgbotapi.ModeHTML
if _, err := a.telegram.Send(msg); err != nil {
return err
}
}
}
return nil
}
func (a *App) readSeqFile() (string, error) {
seqVal, err := os.ReadFile(a.config.RSS.SeqFile)
if err != nil {
return "", err
}
return string(seqVal), nil
}
func (a *App) writeSeqFile(seqVal string) error {
return os.WriteFile(a.config.RSS.SeqFile, []byte(seqVal), 0o644)
}
func (a *App) findNewItems(from string) ([]*gofeed.Item, error) {
fp := gofeed.NewParser()
feed, err := fp.ParseURL(a.config.RSS.URL)
if err != nil {
return nil, err
}
out := make([]*gofeed.Item, 0, len(feed.Items))
for _, item := range feed.Items {
if item.GUID == from {
break
}
out = append(out, item)
}
return out, nil
}
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