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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"
"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(remote string) (*gopher.Response, error) {
resp, err := gopher.Get(remote)
if err != nil {
return nil, err
}
return resp, nil
}
// gopherFeed will fetch and insert a new core.Feed into a core.FullData given a
// gopher url (or update if it's preexisting)
func gopherFeed(data *core.FullData, remote string, title string) error {
resp, err := fetchGopher(remote)
if err != nil {
return err
}
defer resp.Body.Close()
if len(resp.Dir.Items) != 0 {
// TODO
return fmt.Errorf("Gemini-style feeds served over gopher are currently unsupported.")
}
reader := io.LimitReader(resp.Body, 1073741824) // 1 GiB
gofeed, err := gofeed.NewParser().Parse(reader)
if err != nil {
return err
}
feed, err := core.GofeedConvert(gofeed, title)
if err != nil {
return err
}
data.InsertFeed(feed, remote)
return nil
}
// gopherPage will fetch and insert a new core.Page into a core.FullData given a
// gopher url (or update if it's preexisting)
func gopherPage(data *core.FullData, remote string, title string) error {
resp, err := fetchGopher(remote)
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
}
var page core.Page
page.Title = title
page.Link = remote
h := sha256.New()
if _, err := io.Copy(h, reader); err != nil {
return err
}
newHash := fmt.Sprintf("%x", h.Sum(nil))
page.Hash = newHash
page.Updated = time.Now()
data.InsertPage(&page, remote)
return nil
}
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