Refactor Atom parser to use an adapter

internal/reader/atom/atom_03_adapter.go

@@ -0,0 +1,115 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package atom // import "miniflux.app/v2/internal/reader/atom"
+
+import (
+	"log/slog"
+	"time"
+
+	"miniflux.app/v2/internal/crypto"
+	"miniflux.app/v2/internal/model"
+	"miniflux.app/v2/internal/reader/date"
+	"miniflux.app/v2/internal/reader/sanitizer"
+	"miniflux.app/v2/internal/urllib"
+)
+
+type Atom03Adapter struct {
+	atomFeed *Atom03Feed
+}
+
+func NewAtom03Adapter(atomFeed *Atom03Feed) *Atom03Adapter {
+	return &Atom03Adapter{atomFeed}
+}
+
+func (a *Atom03Adapter) BuildFeed(baseURL string) *model.Feed {
+	feed := new(model.Feed)
+
+	// Populate the feed URL.
+	feedURL := a.atomFeed.Links.firstLinkWithRelation("self")
+	if feedURL != "" {
+		if absoluteFeedURL, err := urllib.AbsoluteURL(baseURL, feedURL); err == nil {
+			feed.FeedURL = absoluteFeedURL
+		}
+	} else {
+		feed.FeedURL = baseURL
+	}
+
+	// Populate the site URL.
+	siteURL := a.atomFeed.Links.OriginalLink()
+	if siteURL != "" {
+		if absoluteSiteURL, err := urllib.AbsoluteURL(baseURL, siteURL); err == nil {
+			feed.SiteURL = absoluteSiteURL
+		}
+	} else {
+		feed.SiteURL = baseURL
+	}
+
+	// Populate the feed title.
+	feed.Title = a.atomFeed.Title.Content()
+	if feed.Title == "" {
+		feed.Title = feed.SiteURL
+	}
+
+	for _, atomEntry := range a.atomFeed.Entries {
+		entry := model.NewEntry()
+
+		// Populate the entry URL.
+		entry.URL = atomEntry.Links.OriginalLink()
+		if entry.URL != "" {
+			if absoluteEntryURL, err := urllib.AbsoluteURL(feed.SiteURL, entry.URL); err == nil {
+				entry.URL = absoluteEntryURL
+			}
+		}
+
+		// Populate the entry content.
+		entry.Content = atomEntry.Content.Content()
+		if entry.Content == "" {
+			entry.Content = atomEntry.Summary.Content()
+		}
+
+		// Populate the entry title.
+		entry.Title = atomEntry.Title.Content()
+		if entry.Title == "" {
+			entry.Title = sanitizer.TruncateHTML(entry.Content, 100)
+		}
+		if entry.Title == "" {
+			entry.Title = entry.URL
+		}
+
+		// Populate the entry author.
+		entry.Author = atomEntry.Author.PersonName()
+		if entry.Author == "" {
+			entry.Author = a.atomFeed.Author.PersonName()
+		}
+
+		// Populate the entry date.
+		for _, value := range []string{atomEntry.Issued, atomEntry.Modified, atomEntry.Created} {
+			if parsedDate, err := date.Parse(value); err == nil {
+				entry.Date = parsedDate
+				break
+			} else {
+				slog.Debug("Unable to parse date from Atom 0.3 feed",
+					slog.String("date", value),
+					slog.String("id", atomEntry.ID),
+					slog.Any("error", err),
+				)
+			}
+		}
+		if entry.Date.IsZero() {
+			entry.Date = time.Now()
+		}
+
+		// Generate the entry hash.
+		for _, value := range []string{atomEntry.ID, atomEntry.Links.OriginalLink()} {
+			if value != "" {
+				entry.Hash = crypto.Hash(value)
+				break
+			}
+		}
+
+		feed.Entries = append(feed.Entries, entry)
+	}
+
+	return feed
+}