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package feed
import (
"context"
"errors"
"fmt"
"net/http"
"net/url"
"time"
"github.com/mmcdole/gofeed"
"undef.ninja/x/feedaka/db"
)
// FetchResult holds the result of fetching a feed, including the resolved URL.
type FetchResult struct {
Feed *gofeed.Feed
URL string
}
func Fetch(ctx context.Context, rawURL string) (*FetchResult, error) {
fp := gofeed.NewParser()
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
f, err := fp.ParseURLWithContext(rawURL, ctx)
if err == nil {
return &FetchResult{Feed: f, URL: rawURL}, nil
}
if !errors.Is(err, gofeed.ErrFeedTypeNotDetected) {
return nil, fmt.Errorf("failed to fetch %s: %w", rawURL, err)
}
discoveredURL, discoverErr := discoverFeedURL(ctx, rawURL)
if discoverErr != nil {
return nil, fmt.Errorf("failed to fetch %s: not a feed and auto-discovery failed: %w", rawURL, discoverErr)
}
f, err = fp.ParseURLWithContext(discoveredURL, ctx)
if err != nil {
return nil, fmt.Errorf("failed to fetch discovered feed %s: %w", discoveredURL, err)
}
return &FetchResult{Feed: f, URL: discoveredURL}, nil
}
func discoverFeedURL(ctx context.Context, rawURL string) (string, error) {
req, err := http.NewRequestWithContext(ctx, "GET", rawURL, nil)
if err != nil {
return "", err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
return "", fmt.Errorf("HTTP %d", resp.StatusCode)
}
base, err := url.Parse(rawURL)
if err != nil {
return "", err
}
links := discoverFeeds(resp.Body, base)
feedURL := selectFeed(links)
if feedURL == "" {
return "", fmt.Errorf("no feed links found in HTML")
}
return feedURL, nil
}
func Sync(ctx context.Context, queries *db.Queries, feedID int64, f *gofeed.Feed) error {
err := queries.UpdateFeedMetadata(ctx, db.UpdateFeedMetadataParams{
Title: f.Title,
FetchedAt: time.Now().UTC().Format(time.RFC3339),
ID: feedID,
})
if err != nil {
return err
}
guids, err := queries.GetArticleGUIDsByFeed(ctx, feedID)
if err != nil {
return err
}
existingFeedGUIDs := make(map[string]bool, len(guids))
for _, guid := range guids {
existingFeedGUIDs[guid] = true
}
for _, item := range f.Items {
if existingFeedGUIDs[item.GUID] {
err := queries.UpdateArticle(ctx, db.UpdateArticleParams{
Title: item.Title,
Url: item.Link,
FeedID: feedID,
Guid: item.GUID,
})
if err != nil {
return err
}
} else {
exists, err := queries.CheckArticleExistsByGUID(ctx, item.GUID)
if err != nil {
return err
}
if exists == 1 {
continue
}
_, err = queries.CreateArticle(ctx, db.CreateArticleParams{
FeedID: feedID,
Guid: item.GUID,
Title: item.Title,
Url: item.Link,
IsRead: 0,
})
if err != nil {
return err
}
}
}
return nil
}
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