76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
// Sshwifty - A Web SSH client
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//
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// Copyright (C) 2019-2021 NI Rui <ranqus@gmail.com>
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//
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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
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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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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//
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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 <https://www.gnu.org/licenses/>.
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package controller
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import (
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"net/http"
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"strings"
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"time"
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)
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func clientSupportGZIP(r *http.Request) bool {
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// Should be good enough
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return strings.Contains(r.Header.Get("Accept-Encoding"), "gzip")
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}
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func clientContentEtagIsValid(r *http.Request, eTag string) bool {
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d := r.Header.Get("If-None-Match")
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if len(d) < 0 {
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return false
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}
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dStart := 0
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qETag := "\"" + eTag + "\""
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for {
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dIdx := strings.Index(d[dStart:], ",")
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if dIdx < 0 {
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return strings.Contains(d[dStart:], qETag) ||
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strings.Contains(d[dStart:], "*")
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}
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if strings.Contains(d[dStart:dStart+dIdx], qETag) {
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return true
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}
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if strings.Contains(d[dStart:dStart+dIdx], "*") {
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return true
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}
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dStart += dIdx + 1
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}
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}
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func clientContentModifiedSince(r *http.Request, mod time.Time) bool {
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d := r.Header.Get("If-Modified-Since")
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if len(d) < 0 {
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return false
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}
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dt, dtErr := time.Parse(time.RFC1123, d)
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if dtErr != nil {
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return false
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}
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return !mod.Before(dt)
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}
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