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feeds.go
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feeds.go
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package main
import (
"context"
"fmt"
"log"
"sync"
"time"
"github.com/microcosm-cc/bluemonday"
"github.com/mmcdole/gofeed"
"github.com/nbd-wtf/go-nostr"
"github.com/nbd-wtf/go-nostr/nip19"
)
func (a *Atomstr) dbGetAllFeeds() *[]feedStruct {
sqlStatement := `SELECT pub, sec, url FROM feeds`
rows, err := a.db.Query(sqlStatement)
if err != nil {
log.Fatal("[ERROR] Returning feeds from DB failed")
}
feedItems := []feedStruct{}
for rows.Next() {
feedItem := feedStruct{}
if err := rows.Scan(&feedItem.Pub, &feedItem.Sec, &feedItem.Url); err != nil {
log.Fatal("[ERROR] Scanning for feeds failed")
}
feedItem.Npub, _ = nip19.EncodePublicKey(feedItem.Pub)
feedItems = append(feedItems, feedItem)
}
return &feedItems
}
// func processFeedUrl(ch chan string, wg *sync.WaitGroup, feedItem *feedStruct) {
func processFeedUrl(ch chan feedStruct, wg *sync.WaitGroup) {
for feedItem := range ch {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) // fetch feeds with 10s timeout
defer cancel()
fp := gofeed.NewParser()
feed, err := fp.ParseURLWithContext(feedItem.Url, ctx)
if err != nil {
log.Println("[ERROR] Can't update feed", feedItem.Url)
} else {
log.Println("[DEBUG] Updating feed ", feedItem.Url)
//fmt.Println(feed)
feedItem.Title = feed.Title
feedItem.Description = feed.Description
feedItem.Link = feed.Link
if feed.Image != nil {
feedItem.Image = feed.Image.URL
} else {
feedItem.Image = defaultFeedImage
}
//feedItem.Image = feed.Image
for i := range feed.Items {
processFeedPost(feedItem, feed.Items[i])
}
log.Println("[DEBUG] Finished updating feed ", feedItem.Url)
}
}
wg.Done()
}
func processFeedPost(feedItem feedStruct, feedPost *gofeed.Item) {
p := bluemonday.StripTagsPolicy() // initialize html sanitizer
//fmt.Println(feedPost.PublishedParsed)
// if time right, then push
if checkMaxAge(feedPost.PublishedParsed, fetchInterval) {
feedText := feedPost.Title + "\n\n" + p.Sanitize(feedPost.Description)
//feedText := feedPost.Title + "\n\n" + feedPost.Description
if feedPost.Link != "" {
feedText = feedText + "\n\n" + feedPost.Link
}
//postTime := convertTimeString(feedPost.PublishedParsed)
ev := nostr.Event{
PubKey: feedItem.Pub,
CreatedAt: nostr.Timestamp(feedPost.PublishedParsed.Unix()),
Kind: nostr.KindTextNote,
Tags: nil,
Content: feedText,
}
ev.Sign(feedItem.Sec)
nostrPostItem(ev)
}
}
func (a *Atomstr) dbWriteFeed(feedItem *feedStruct) bool {
_, err := a.db.Exec(`insert into feeds (pub, sec, url) values(?, ?, ?)`, feedItem.Pub, feedItem.Sec, feedItem.Url)
if err != nil {
fmt.Println("[ERROR] Can't add feed!")
log.Fatal(err)
}
nip19Pub, _ := nip19.EncodePublicKey(feedItem.Pub)
log.Println("[INFO] Added feed " + feedItem.Url + " with public key " + nip19Pub)
return true
}
func (a *Atomstr) dbGetFeed(feedUrl string) *feedStruct {
sqlStatement := `SELECT pub, sec, url FROM feeds WHERE url=$1;`
row := a.db.QueryRow(sqlStatement, feedUrl)
feedItem := feedStruct{}
err := row.Scan(&feedItem.Pub, &feedItem.Sec, &feedItem.Url)
if err != nil {
log.Println("[INFO] Feed not found in DB")
}
return &feedItem
}
func checkValidFeedSource(feedUrl string) (*feedStruct, error) {
log.Println("[DEBUG] Trying to find feed at", feedUrl)
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
fp := gofeed.NewParser()
feed, err := fp.ParseURLWithContext(feedUrl, ctx)
feedItem := feedStruct{}
if err != nil {
log.Println("[ERROR] Not a valid feed source")
return &feedItem, err
}
// FIXME! That needs proper error handling.
feedItem.Url = feedUrl
feedItem.Title = feed.Title
feedItem.Description = feed.Description
feedItem.Link = feed.Link
if feed.Image != nil {
feedItem.Image = feed.Image.URL
} else {
feedItem.Image = defaultFeedImage
}
return &feedItem, err
}
func (a *Atomstr) addSource(feedUrl string) (*feedStruct, error) {
//var feedElem2 *feedStruct
feedItem, err := checkValidFeedSource(feedUrl)
//if feedItem.Title == "" {
if err != nil {
log.Println("[ERROR] No valid feed found on", feedUrl)
return feedItem, err
}
// check for existing feed
feedTest := a.dbGetFeed(feedUrl)
if feedTest.Url != "" {
log.Println("[WARN] Feed already exists")
return feedItem, err
}
feedItemKeys := generateKeysForUrl(feedUrl)
feedItem.Pub = feedItemKeys.Pub
feedItem.Sec = feedItemKeys.Sec
//fmt.Println(feedItem)
a.dbWriteFeed(feedItem)
nostrUpdateFeedMetadata(feedItem)
return feedItem, err
}
func (a *Atomstr) deleteSource(feedUrl string) bool {
// check for existing feed
feedTest := a.dbGetFeed(feedUrl)
if feedTest.Url != "" {
sqlStatement := `DELETE FROM feeds WHERE url=$1;`
_, err := a.db.Exec(sqlStatement, feedUrl)
if err != nil {
log.Println("[WARN] Can't remove Feed")
log.Fatal(err)
}
log.Println("[INFO] Feed removed")
return true
} else {
log.Println("[WARN] Feed not found")
return false
}
}
func (a *Atomstr) listFeeds() {
feeds := a.dbGetAllFeeds()
for _, feedItem := range *feeds {
nip19Pub, _ := nip19.EncodePublicKey(feedItem.Pub)
fmt.Print(nip19Pub + " ")
fmt.Println(feedItem.Url)
}
}