447a51f08b
* feat: kubesphere 4.0 Signed-off-by: ci-bot <ci-bot@kubesphere.io> * feat: kubesphere 4.0 Signed-off-by: ci-bot <ci-bot@kubesphere.io> --------- Signed-off-by: ci-bot <ci-bot@kubesphere.io> Co-authored-by: ks-ci-bot <ks-ci-bot@example.com> Co-authored-by: joyceliu <joyceliu@yunify.com>
76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package printers
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import (
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"io"
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"os"
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"runtime"
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"strings"
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"github.com/moby/term"
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)
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// terminalEscaper replaces ANSI escape sequences and other terminal special
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// characters to avoid terminal escape character attacks (issue #101695).
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var terminalEscaper = strings.NewReplacer("\x1b", "^[", "\r", "\\r")
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// WriteEscaped replaces unsafe terminal characters with replacement strings
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// and writes them to the given writer.
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func WriteEscaped(writer io.Writer, output string) error {
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_, err := terminalEscaper.WriteString(writer, output)
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return err
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}
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// EscapeTerminal escapes terminal special characters in a human readable (but
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// non-reversible) format.
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func EscapeTerminal(in string) string {
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return terminalEscaper.Replace(in)
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}
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// IsTerminal returns whether the passed object is a terminal or not
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func IsTerminal(i interface{}) bool {
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_, terminal := term.GetFdInfo(i)
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return terminal
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}
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// AllowsColorOutput returns true if the specified writer is a terminal and
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// the process environment indicates color output is supported and desired.
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func AllowsColorOutput(w io.Writer) bool {
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if !IsTerminal(w) {
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return false
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}
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// https://en.wikipedia.org/wiki/Computer_terminal#Dumb_terminals
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if os.Getenv("TERM") == "dumb" {
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return false
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}
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// https://no-color.org/
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if _, nocolor := os.LookupEnv("NO_COLOR"); nocolor {
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return false
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}
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// On Windows WT_SESSION is set by the modern terminal component.
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// Older terminals have poor support for UTF-8, VT escape codes, etc.
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if runtime.GOOS == "windows" && os.Getenv("WT_SESSION") == "" {
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return false
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}
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return true
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}
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