package feed import ( "fmt" "net/url" "strings" "time" "github.com/Necoro/gofeed" "github.com/Necoro/feed2imap-go/internal/feed/filter" "github.com/Necoro/feed2imap-go/pkg/config" "github.com/Necoro/feed2imap-go/pkg/log" ) type Feed struct { *config.Feed feed *gofeed.Feed filter *filter.Filter items []Item Global config.GlobalOptions extID FeedID } type FeedID interface { String() string } type FilterFunc func(items []Item, ignHash, alwaysNew bool) []Item type Descriptor struct { Name string Url string } func (feed *Feed) Descriptor() Descriptor { var url string if feed.Url != "" { url = feed.Url } else { url = "exec://" + strings.Join(feed.Exec, "/") } return Descriptor{ Name: feed.Name, Url: url, } } func (feed *Feed) NeedsUpdate(updateTime time.Time) bool { if feed.MinFreq == 0 { // shortcut return true } if !updateTime.IsZero() && int(time.Since(updateTime).Hours()) < feed.MinFreq { log.Printf("Feed '%s' does not need updating, skipping.", feed.Name) return false } return true } func (feed *Feed) FetchSuccessful() bool { return feed.feed != nil } func Create(parsedFeed *config.Feed, global config.GlobalOptions) (*Feed, error) { var itemFilter *filter.Filter var err error if parsedFeed.ItemFilter != "" { if itemFilter, err = filter.New(parsedFeed.ItemFilter); err != nil { return nil, fmt.Errorf("Feed %s: Parsing item-filter: %w", parsedFeed.Name, err) } } return &Feed{Feed: parsedFeed, Global: global, filter: itemFilter}, nil } func (feed *Feed) filterItems() []Item { if feed.filter == nil { return feed.items } items := make([]Item, 0, len(feed.items)) for _, item := range feed.items { res, err := feed.filter.Run(item.Item) if err != nil { log.Errorf("Feed %s: Item %s: Error applying item filter: %s", feed.Name, printItem(item.Item), err) res = true // include } if res { if log.IsDebug() { log.Debugf("Filter '%s' matches for item %s", feed.ItemFilter, printItem(item.Item)) } items = append(items, item) } else if log.IsDebug() { // printItem is not for free log.Debugf("Filter '%s' does not match for item %s", feed.ItemFilter, printItem(item.Item)) } } return items } func (feed *Feed) Filter(filter FilterFunc) { if len(feed.items) > 0 { origLen := len(feed.items) log.Debugf("Filtering %s. Starting with %d items", feed.Name, origLen) items := feed.filterItems() newLen := len(items) if newLen < origLen { log.Printf("Item filter on %s: Reduced from %d to %d items.", feed.Name, origLen, newLen) origLen = newLen } feed.items = filter(items, feed.IgnHash, feed.AlwaysNew) newLen = len(feed.items) if newLen < origLen { log.Printf("Filtered %s. Reduced from %d to %d items.", feed.Name, origLen, newLen) } else { log.Printf("Filtered %s, no reduction.", feed.Name) } } else { log.Debugf("No items for %s. No filtering.", feed.Name) } } func (feed *Feed) SetExtID(extID FeedID) { feed.extID = extID } func (feed *Feed) id() string { if feed.extID == nil { return feed.Name } return feed.extID.String() } func (feed *Feed) url() *url.URL { var feedUrl *url.URL tryUrl := func(content, what string) bool { var err error if content != "" { feedUrl, err = url.Parse(content) if err != nil { log.Errorf("%s '%s' of feed '%s' is not a valid URL.", what, content, feed.Name) } else { return true } } return false } if !(tryUrl(feed.feed.FeedLink, "Self-Link") || tryUrl(feed.Url, "URL") || tryUrl(feed.feed.Link, "Link")) { panic(fmt.Sprintf("Could not find a valid URL for for feed '%s'. How have we ended up here?", feed.Name)) } return feedUrl }