Change structure of code to a frontend and backend one

cmd/backend/rss.go

@@ -0,0 +1,132 @@
+package backend
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"time"
+
+	"git.streifling.com/jason/rss"
+)
+
+func GetChannel(db *DB, title, link, description string) (*rss.Channel, error) {
+	channel := &rss.Channel{
+		Title:       title,
+		Link:        link,
+		Description: description,
+		Items:       make([]*rss.Item, 0),
+	}
+
+	articles, err := db.GetCertainArticles(true, false)
+	if err != nil {
+		return nil, fmt.Errorf("error fetching published articles: %v", err)
+	}
+
+	for _, article := range articles {
+		tags, err := db.GetArticleTags(article.ID)
+		if err != nil {
+			return nil, fmt.Errorf("error fetching tags for article %v: %v", article.Title, err)
+		}
+		tagNames := make([]string, 0)
+		for _, tag := range tags {
+			tagNames = append(tagNames, tag.Name)
+		}
+
+		user, err := db.GetUser(article.AuthorID)
+		if err != nil {
+			return nil, fmt.Errorf("error finding user %v: %v", article.AuthorID, err)
+		}
+
+		channel.Items = append(channel.Items, &rss.Item{
+			Title:       article.Title,
+			Author:      user.FirstName + user.LastName,
+			PubDate:     article.Created.Format(time.RFC1123Z),
+			Description: article.Description,
+			Content:     &rss.Content{Value: article.Content},
+			Categories:  tagNames,
+		})
+	}
+
+	return channel, nil
+}
+
+func GenerateRSS(db *DB, title, link, desc string) (*string, error) {
+	channel := &rss.Channel{
+		Title:       title,
+		Link:        link,
+		Description: desc,
+		Items:       make([]*rss.Item, 0),
+	}
+
+	articles, err := db.GetCertainArticles(true, false)
+	if err != nil {
+		return nil, fmt.Errorf("error getting published articles for RSS feed: %v", err)
+	}
+
+	for _, article := range articles {
+		tags, err := db.GetArticleTags(article.ID)
+		if err != nil {
+			return nil, fmt.Errorf("error getting tags for articles for RSS feed: %v", err)
+		}
+		tagNames := make([]string, 0)
+		for _, tag := range tags {
+			tagNames = append(tagNames, tag.Name)
+		}
+		tagNames = append(tagNames, fmt.Sprint("Orient Express ", article.IssueID))
+
+		user, err := db.GetUser(article.AuthorID)
+		if err != nil {
+			return nil, fmt.Errorf("error getting user user info for RSS feed: %v", err)
+		}
+
+		articleTitle, err := ConvertToPlain(article.Title)
+		if err != nil {
+			return nil, fmt.Errorf("error converting title to plain text for RSS feed: %v", err)
+		}
+
+		articleDescription, err := ConvertToPlain(article.Description)
+		if err != nil {
+			return nil, fmt.Errorf("error converting description to plain text for RSS feed: %v", err)
+		}
+
+		articleContent, err := ConvertToHTML(article.Content)
+		if err != nil {
+			return nil, fmt.Errorf("error converting content to HTML for RSS feed: %v", err)
+		}
+
+		channel.Items = append(channel.Items, &rss.Item{
+			Title:       articleTitle,
+			Author:      user.FirstName + " " + user.LastName,
+			PubDate:     article.Created.Format(time.RFC1123Z),
+			Description: articleDescription,
+			Content:     &rss.Content{Value: articleContent},
+			Categories:  tagNames,
+		})
+	}
+
+	feed := rss.NewFeed()
+	feed.Channels = append(feed.Channels, channel)
+	rss, err := feed.ToXML("UTF-8")
+	if err != nil {
+		return nil, fmt.Errorf("error converting RSS feed to XML: %v", err)
+	}
+
+	return &rss, nil
+}
+
+func SaveRSS(filename string, feed *string) error {
+	file, err := os.Create(filename)
+	if err != nil {
+		return fmt.Errorf("error creating file for RSS feed: %v", err)
+	}
+	defer file.Close()
+	if err = file.Chmod(0644); err != nil {
+		return fmt.Errorf("error setting permissions for RSS file: %v", err)
+	}
+
+	if _, err = io.WriteString(file, *feed); err != nil {
+		return fmt.Errorf("error writing to RSS file: %v", err)
+	}
+
+	return nil
+}