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// Copyright (C) 2021 nytpu
// SPDX-License-Identifier: AGPL-3.0-or-later
// For more license details, see LICENSE or <https://www.gnu.org/licenses/agpl-3.0.html>.
package fetch
import (
"bytes"
"crypto/sha256"
"fmt"
"io"
"net/url"
"time"
//"github.com/mmcdole/gofeed"
"github.com/prologic/go-gopher"
"golang.nytpu.com/comitium/core"
)
// fetchGopher will make a request for a gopher resource
func fetchGopher(remoteURL *url.URL) (*gopher.Response, error) {
resp, err := gopher.Get(remoteURL.String())
if err != nil {
return nil, err
}
return resp, nil
}
// newGopherFeed will fetch and create a new core.Feed given a gopher url
func newGopherFeed(remoteURL *url.URL, title string) (*core.Feed, error) {
// TODO
return nil, fmt.Errorf("Feeds served over gopher are currently unsupported.")
}
// newGopherPage will create a new core.Page given a gopher url
func newGopherPage(remoteURL *url.URL, title string) (*core.Page, error) {
var page core.Page
page.Title = title
page.Link = remoteURL
err := updateGopherPage(&page)
if err != nil {
return nil, err
}
return &page, nil
}
// updateGopherPage wll check an existing core.Page for changes
func updateGopherPage(p *core.Page) error {
resp, err := fetchGopher(p.Link)
if err != nil {
return err
}
defer resp.Body.Close()
var reader io.Reader
if len(resp.Dir.Items) > 0 {
text, err := resp.Dir.ToText()
if err != nil {
return err
}
reader = io.LimitReader(bytes.NewReader(text), 1073741824) // 1 GiB
} else {
reader = io.LimitReader(resp.Body, 1073741824) // 1 GiB
}
h := sha256.New()
if _, err := io.Copy(h, reader); err != nil {
return err
}
newHash := fmt.Sprintf("%x", h.Sum(nil))
if newHash != p.Hash {
p.Hash = newHash
p.Updated = time.Now()
}
return nil
}
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