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package feed
import (
"log"
"net/http"
"strings"
"time"
"github.com/PuerkitoBio/goquery"
"adammathes.com/neko/internal/safehttp"
"adammathes.com/neko/models"
)
type Feed struct {
Id int64 `json:"_id" xml:"-"`
Url string `json:"url" xml:"xmlUrl,attr"`
WebUrl string `json:"web_url" xml:"htmlUrl,attr"`
Title string `json:"title" xml:"text,attr"`
Category string `json:"category"`
// for OPML output purposes
XMLName string `json:"-" xml:"outline"`
Type string `json:"-" xml:"type,attr"`
}
type Category struct {
Title string `json:"title"`
}
func NewFeed(url string) error {
url = ResolveFeedURL(url)
stmt, err := models.DB.Prepare("INSERT INTO feed(url) VALUES(?)")
if err != nil {
return err
}
_, err = stmt.Exec(url)
if err != nil {
return err
}
return nil
}
func All() ([]*Feed, error) {
return filter(" ORDER BY lower(TITLE) asc")
}
func filter(where string) ([]*Feed, error) {
// todo: add back in title
rows, err := models.DB.Query(`SELECT
id, url, web_url, title, category
FROM feed ` + where)
if err != nil {
return nil, err
}
defer func() { _ = rows.Close() }()
feeds := make([]*Feed, 0)
for rows.Next() {
f := new(Feed)
err := rows.Scan(&f.Id, &f.Url, &f.WebUrl, &f.Title, &f.Category)
f.Type = "rss"
if err != nil {
return nil, err
}
feeds = append(feeds, f)
}
if err = rows.Err(); err != nil {
return nil, err
}
return feeds, nil
}
func (f *Feed) Update() {
if len(f.Title) == 0 {
return
}
if f.Id == 0 {
return
}
if len(f.Url) == 0 {
return
}
_, _ = models.DB.Exec(`UPDATE feed
SET title=?, url=?, web_url=?, category=?
WHERE id=?`, f.Title, f.Url, f.WebUrl, f.Category, f.Id)
}
func (f *Feed) Delete() {
_, err := models.DB.Exec(`DELETE FROM feed
WHERE id=?`, f.Id)
if err != nil {
log.Println(err)
}
}
func (f *Feed) ByUrl(url string) error {
err := models.DB.QueryRow(`SELECT id, url, title, category
FROM feed
WHERE url = ?`, url).Scan(&f.Id, &f.Url, &f.Title, &f.Category)
if err != nil {
return err
}
return nil
}
func (f *Feed) Create() error {
res, err := models.DB.Exec(`INSERT INTO feed(url, title, category)
VALUES(?, ?, ?)`, f.Url, f.Title, f.Category)
if err != nil {
return err
}
id, _ := res.LastInsertId()
f.Id = id
return nil
}
// Given a string `url`, return to the best guess of the feed
func ResolveFeedURL(url string) string {
c := safehttp.NewSafeClient(10 * time.Second)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return url
}
req.Header.Set("User-Agent", "neko RSS Crawler +https://github.com/adammathes/neko")
resp, err := c.Do(req)
if err != nil {
return url
}
defer func() { _ = resp.Body.Close() }()
contentType := resp.Header.Get("Content-Type")
if contentType == "" {
return url
}
switch {
case strings.HasPrefix(contentType, "text/xml"):
return url
case strings.HasPrefix(contentType, "text/rss+xml"):
return url
case strings.HasPrefix(contentType, "application/rss+xml"):
return url
case strings.HasPrefix(contentType, "application/atom+xml"):
return url
}
// goquery is probably overkill here
resp, err = c.Get(url)
if err != nil {
return url
}
defer func() { _ = resp.Body.Close() }()
doc, err := goquery.NewDocumentFromReader(resp.Body)
if err != nil {
return url
}
var f string
// loop over each link element, return first one that is of type rss or atom
f = ""
doc.Find("link").Each(func(i int, s *goquery.Selection) {
if f != "" {
// we're done
return
}
t := s.AttrOr("type", "")
h := s.AttrOr("href", "")
if t == "application/atom+xml" {
f = h
}
if t == "application/rss+xml" {
f = h
}
})
// if we have nothing, just return the original url
if f == "" {
f = url
}
// if we don't start with http[s] its probably relative
if f[0] != 'h' {
f = url + f
}
return f
}
func Categories() ([]*Category, error) {
rows, err := models.DB.Query(`SELECT
DISTINCT category
FROM feed
WHERE category!=""
ORDER BY lower(category) ASC`)
if err != nil {
return nil, err
}
defer func() { _ = rows.Close() }()
categories := make([]*Category, 0)
for rows.Next() {
c := new(Category)
err := rows.Scan(&c.Title)
if err != nil {
return nil, err
}
categories = append(categories, c)
}
if err = rows.Err(); err != nil {
return nil, err
}
return categories, nil
}
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