1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
package app
import (
"bytes"
"context"
"log/slog"
"os"
"regexp"
"strings"
"text/template"
"time"
tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
"github.com/mmcdole/gofeed"
"gitrepo.ru/neonxp/rss2world/templates"
)
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)
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("")
item.Content = trimHtml(item.Description)
if err := a.templates.ExecuteTemplate(buf, "telegram", item); err != nil {
return err
}
str := buf.String()
for _, group := range a.config.Telegram.TargetGroups {
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
}
func trimHtml(src string) string {
// Convert all HTML tags to lowercase
re, _ := regexp.Compile("\\<[\\S\\s]+?\\>")
src = re.ReplaceAllStringFunc(src, strings.ToLower)
// Remove STYLE
re, _ = regexp.Compile("\\<style[\\S\\s]+?\\</style\\>")
src = re.ReplaceAllString(src, "")
// Remove SCRIPT
re, _ = regexp.Compile("\\<script[\\S\\s]+?\\</script\\>")
src = re.ReplaceAllString(src, "")
// Remove all HTML code in angle brackets and replace them with newline characters
re, _ = regexp.Compile("\\<[\\S\\s]+?\\>")
src = re.ReplaceAllString(src, "\n")
// Remove consecutive newlines
re, _ = regexp.Compile("\\s{2,}")
src = re.ReplaceAllString(src, "\n")
return strings.TrimSpace(src)
}
|
