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news.go
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news.go
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package cron
import (
"crypto/md5"
"errors"
"fmt"
"regexp"
"strings"
"time"
"github.com/TUM-Dev/Campus-Backend/server/model"
"github.com/guregu/null"
"github.com/microcosm-cc/bluemonday"
"github.com/mmcdole/gofeed"
log "github.com/sirupsen/logrus"
"gorm.io/gorm"
)
const (
NewsImageDirectory = "news/newspread/"
NewspreadHook = "newspread"
ImpulsivHook = "impulsivHook"
//MAX_IMAGE_RETRYS = 3
)
var ImageContentTypeRegex, _ = regexp.Compile("image/[a-z.]+")
// newsCron fetches news and saves them to the database
func (c *CronService) newsCron(cronjob *model.Crontab) error {
//check if source id provided for news job is not null
if !cronjob.ID.Valid {
fields := log.Fields{
"Cron": cronjob.Cron,
"Interval": cronjob.Interval,
"LastRun": cronjob.LastRun,
"Type": cronjob.Type,
"ID": cronjob.ID,
}
log.WithFields(fields).Warn("skipping news job, id of source is null")
return nil
}
// get news source for cronjob
var source model.NewsSource
err := c.db.Find(&source, cronjob.ID.Int64).Error
if err != nil {
log.WithError(err).Error("getting news source from database")
return err
}
// skip sources with null url
if source.URL.Valid {
// clean up news older than one year
err := c.cleanOldNewsForSource(source.Source)
if err != nil {
return err
}
err = c.parseNewsFeed(source)
if err != nil {
return err
}
}
return nil
}
// parseNewsFeed processes a single news feed, extracts titles, content etc and saves it to the database
func (c *CronService) parseNewsFeed(source model.NewsSource) error {
log.WithField("url", source.URL.String).Trace("processing newsfeed")
feed, err := c.gf.ParseURL(source.URL.String)
if err != nil {
log.WithError(err).Error("parsing rss")
return err
}
// get all news for this source so we only process new ones, using map for performance reasons
existingNewsLinksForSource := make([]string, 0)
if err := c.db.Table("`news`").
Select("`link`").
Find(&existingNewsLinksForSource, "`src` = ?", source.Source).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
log.WithError(err).Error("failed to fetch existing news")
return err
}
var newNews []model.News
for _, item := range feed.Items {
// execute special actions for some sources:
if source.Hook.Valid {
switch source.Hook.String {
case NewspreadHook:
c.newspreadHook(item)
case ImpulsivHook:
c.impulsivHook(item)
}
}
if skipNews(existingNewsLinksForSource, item.Link) {
continue
}
// pick the first enclosure that is an image (if any)
var pickedEnclosure *gofeed.Enclosure
for _, enclosure := range item.Enclosures {
if strings.HasSuffix(enclosure.URL, "jpg") ||
strings.HasSuffix(enclosure.URL, "jpeg") ||
strings.HasSuffix(enclosure.URL, "png") ||
ImageContentTypeRegex.MatchString(enclosure.Type) {
pickedEnclosure = enclosure
break
}
}
var enclosureUrl = null.StringFrom("")
var file *model.File
var fileID null.Int
if pickedEnclosure != nil {
file, err = c.saveImage(pickedEnclosure.URL)
if err != nil {
log.WithError(err).WithField("url", pickedEnclosure.URL).Error("can't save news image")
} else {
fileID = null.IntFrom(file.File)
}
enclosureUrl = null.StringFrom(pickedEnclosure.URL)
}
newsItem := model.News{
Date: *item.PublishedParsed,
Created: time.Now(),
Title: item.Title,
Description: bluemonday.StrictPolicy().Sanitize(item.Description),
NewsSourceID: source.Source,
NewsSource: source,
Link: item.Link,
Image: enclosureUrl,
FileID: fileID,
File: file,
}
newNews = append(newNews, newsItem)
}
if ammountOfNewNews := len(newNews); ammountOfNewNews != 0 {
err = c.db.Save(&newNews).Error
if err != nil {
log.WithField("ammountOfNewNews", ammountOfNewNews).Error("Inserting new news failed")
} else {
log.WithField("ammountOfNewNews", ammountOfNewNews).Trace("Inserting new news")
}
return err
}
return nil
}
// saveImage saves an image to the database, so it can be downloaded by another cronjob and returns its id
func (c *CronService) saveImage(url string) (*model.File, error) {
targetFileName := fmt.Sprintf("%x.jpg", md5.Sum([]byte(url)))
var file model.File
// path intentionally omitted in query to allow for deduplication
if err := c.db.First(&file, "name = ?", targetFileName).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
log.WithError(err).WithField("targetFileName", targetFileName).Error("Couldn't query database for file")
return nil, err
} else if err == nil {
return &file, nil
}
// does not exist, store in database
file = model.File{
Name: targetFileName,
Path: NewsImageDirectory,
URL: null.StringFrom(url),
Downloaded: null.BoolFrom(false),
}
if err := c.db.Create(&file).Error; err != nil {
log.WithError(err).Error("Could not store new file to database")
return nil, err
}
return &file, nil
}
// skipNews returns true if link is in existingLinks or link is invalid
func skipNews(existingLinks []string, link string) bool {
if link == "" {
return true
}
for _, l := range existingLinks {
if l == link {
return true
}
}
return false
}
func (c *CronService) cleanOldNewsForSource(source int64) error {
log.WithField("source", source).Trace("Truncating old entries")
oneYearAgo := time.Now().Add(time.Hour * 24 * 365 * -1)
if res := c.db.Delete(&model.News{}, "`src` = ? AND `created` < ?", source, oneYearAgo); res.Error == nil {
log.WithField("RowsAffected", res.RowsAffected).Info("cleaned up old news")
} else {
log.WithError(res.Error).Error("failed to clean up old news")
return res.Error
}
return nil
}
// newspreadHook extracts image urls from the body if the feed because such entries are a bit weird
func (c *CronService) newspreadHook(item *gofeed.Item) {
re := regexp.MustCompile(`https://storage.googleapis.com/tum-newspread-de/assets/[a-z\-0-9]+\.jpeg`)
extractedImageSlice := re.FindAllString(item.Content, 1)
extractedImageURL := ""
if len(extractedImageSlice) != 0 {
extractedImageURL = extractedImageSlice[0]
}
item.Enclosures = []*gofeed.Enclosure{{URL: extractedImageURL}}
item.Description = ""
}
// impulsivHook Converts the title of impulsiv news to a human friendly one
func (c *CronService) impulsivHook(item *gofeed.Item) {
// Convert titles such as "123" to "Impulsiv - Ausgabe 123"
re := regexp.MustCompile("[0-9]+")
match := re.FindAllString(item.Title, -1)
if len(match) == 1 && match[0] == item.Title {
item.Title = fmt.Sprintf("Impulsiv - Ausgabe %s", item.Title)
} else {
// convert titles such as "Lösungen zur Ausgabe 137" to "Impulsiv - Lösungen zur Ausgabe 137"
item.Title = fmt.Sprintf("Impulsiv - %s", item.Title)
}
}