forked from mirrors/gotosocial
62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
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/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package web
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import (
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// nolint:gosec
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"crypto/sha1"
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"encoding/hex"
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"io"
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"time"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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"codeberg.org/gruf/go-cache/v2"
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)
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func newETagCache() cache.Cache[string, eTagCacheEntry] {
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eTagCache := cache.New[string, eTagCacheEntry]()
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eTagCache.SetTTL(time.Hour, false)
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if !eTagCache.Start(time.Minute) {
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log.Panic("could not start eTagCache")
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}
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return eTagCache
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}
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type eTagCacheEntry struct {
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eTag string
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lastModified time.Time
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}
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// generateEtag generates a strong (byte-for-byte) etag using
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// the entirety of the provided reader.
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func generateEtag(r io.Reader) (string, error) {
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// nolint:gosec
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hash := sha1.New()
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if _, err := io.Copy(hash, r); err != nil {
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return "", err
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}
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b := make([]byte, 0, sha1.Size)
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b = hash.Sum(b)
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return `"` + hex.EncodeToString(b) + `"`, nil
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}
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