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