mirror of
https://github.com/go-gitea/gitea
synced 2024-08-18 05:10:41 +02:00
430 lines
10 KiB
Go
430 lines
10 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package log
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import (
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"fmt"
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"io"
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"reflect"
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"strconv"
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"strings"
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)
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const escape = "\033"
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// ColorAttribute defines a single SGR Code
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type ColorAttribute int
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// Base ColorAttributes
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const (
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Reset ColorAttribute = iota
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Bold
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Faint
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Italic
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Underline
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BlinkSlow
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BlinkRapid
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ReverseVideo
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Concealed
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CrossedOut
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)
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// Foreground text colors
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const (
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FgBlack ColorAttribute = iota + 30
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FgRed
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FgGreen
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FgYellow
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FgBlue
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FgMagenta
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FgCyan
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FgWhite
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)
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// Foreground Hi-Intensity text colors
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const (
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FgHiBlack ColorAttribute = iota + 90
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FgHiRed
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FgHiGreen
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FgHiYellow
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FgHiBlue
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FgHiMagenta
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FgHiCyan
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FgHiWhite
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)
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// Background text colors
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const (
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BgBlack ColorAttribute = iota + 40
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BgRed
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BgGreen
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BgYellow
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BgBlue
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BgMagenta
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BgCyan
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BgWhite
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)
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// Background Hi-Intensity text colors
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const (
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BgHiBlack ColorAttribute = iota + 100
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BgHiRed
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BgHiGreen
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BgHiYellow
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BgHiBlue
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BgHiMagenta
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BgHiCyan
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BgHiWhite
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)
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var colorAttributeToString = map[ColorAttribute]string{
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Reset: "Reset",
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Bold: "Bold",
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Faint: "Faint",
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Italic: "Italic",
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Underline: "Underline",
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BlinkSlow: "BlinkSlow",
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BlinkRapid: "BlinkRapid",
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ReverseVideo: "ReverseVideo",
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Concealed: "Concealed",
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CrossedOut: "CrossedOut",
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FgBlack: "FgBlack",
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FgRed: "FgRed",
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FgGreen: "FgGreen",
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FgYellow: "FgYellow",
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FgBlue: "FgBlue",
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FgMagenta: "FgMagenta",
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FgCyan: "FgCyan",
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FgWhite: "FgWhite",
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FgHiBlack: "FgHiBlack",
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FgHiRed: "FgHiRed",
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FgHiGreen: "FgHiGreen",
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FgHiYellow: "FgHiYellow",
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FgHiBlue: "FgHiBlue",
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FgHiMagenta: "FgHiMagenta",
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FgHiCyan: "FgHiCyan",
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FgHiWhite: "FgHiWhite",
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BgBlack: "BgBlack",
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BgRed: "BgRed",
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BgGreen: "BgGreen",
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BgYellow: "BgYellow",
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BgBlue: "BgBlue",
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BgMagenta: "BgMagenta",
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BgCyan: "BgCyan",
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BgWhite: "BgWhite",
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BgHiBlack: "BgHiBlack",
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BgHiRed: "BgHiRed",
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BgHiGreen: "BgHiGreen",
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BgHiYellow: "BgHiYellow",
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BgHiBlue: "BgHiBlue",
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BgHiMagenta: "BgHiMagenta",
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BgHiCyan: "BgHiCyan",
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BgHiWhite: "BgHiWhite",
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}
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func (c *ColorAttribute) String() string {
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return colorAttributeToString[*c]
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}
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var colorAttributeFromString = map[string]ColorAttribute{}
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// ColorAttributeFromString will return a ColorAttribute given a string
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func ColorAttributeFromString(from string) ColorAttribute {
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lowerFrom := strings.TrimSpace(strings.ToLower(from))
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return colorAttributeFromString[lowerFrom]
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}
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// ColorString converts a list of ColorAttributes to a color string
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func ColorString(attrs ...ColorAttribute) string {
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return string(ColorBytes(attrs...))
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}
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// ColorBytes converts a list of ColorAttributes to a byte array
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func ColorBytes(attrs ...ColorAttribute) []byte {
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bytes := make([]byte, 0, 20)
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bytes = append(bytes, escape[0], '[')
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if len(attrs) > 0 {
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bytes = append(bytes, strconv.Itoa(int(attrs[0]))...)
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for _, a := range attrs[1:] {
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bytes = append(bytes, ';')
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bytes = append(bytes, strconv.Itoa(int(a))...)
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}
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} else {
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bytes = append(bytes, strconv.Itoa(int(Bold))...)
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}
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bytes = append(bytes, 'm')
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return bytes
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}
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var levelToColor = map[Level][]byte{
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TRACE: ColorBytes(Bold, FgCyan),
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DEBUG: ColorBytes(Bold, FgBlue),
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INFO: ColorBytes(Bold, FgGreen),
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WARN: ColorBytes(Bold, FgYellow),
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ERROR: ColorBytes(Bold, FgRed),
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CRITICAL: ColorBytes(Bold, BgMagenta),
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FATAL: ColorBytes(Bold, BgRed),
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NONE: ColorBytes(Reset),
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}
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var (
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resetBytes = ColorBytes(Reset)
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fgCyanBytes = ColorBytes(FgCyan)
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fgGreenBytes = ColorBytes(FgGreen)
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fgBoldBytes = ColorBytes(Bold)
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)
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type protectedANSIWriterMode int
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const (
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escapeAll protectedANSIWriterMode = iota
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allowColor
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removeColor
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)
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type protectedANSIWriter struct {
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w io.Writer
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mode protectedANSIWriterMode
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}
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// Write will protect against unusual characters
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func (c *protectedANSIWriter) Write(bytes []byte) (int, error) {
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end := len(bytes)
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totalWritten := 0
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normalLoop:
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for i := 0; i < end; {
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lasti := i
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if c.mode == escapeAll {
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for i < end && (bytes[i] >= ' ' || bytes[i] == '\n' || bytes[i] == '\t') {
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i++
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}
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} else {
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// Allow tabs if we're not escaping everything
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for i < end && (bytes[i] >= ' ' || bytes[i] == '\t') {
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i++
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}
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}
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if i > lasti {
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written, err := c.w.Write(bytes[lasti:i])
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totalWritten += written
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if err != nil {
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return totalWritten, err
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}
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}
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if i >= end {
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break
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}
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// If we're not just escaping all we should prefix all newlines with a \t
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if c.mode != escapeAll {
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if bytes[i] == '\n' {
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written, err := c.w.Write([]byte{'\n', '\t'})
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if written > 0 {
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totalWritten++
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}
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if err != nil {
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return totalWritten, err
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}
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i++
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continue normalLoop
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}
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if bytes[i] == escape[0] && i+1 < end && bytes[i+1] == '[' {
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for j := i + 2; j < end; j++ {
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if bytes[j] >= '0' && bytes[j] <= '9' {
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continue
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}
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if bytes[j] == ';' {
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continue
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}
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if bytes[j] == 'm' {
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if c.mode == allowColor {
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written, err := c.w.Write(bytes[i : j+1])
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totalWritten += written
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if err != nil {
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return totalWritten, err
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}
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} else {
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totalWritten = j
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}
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i = j + 1
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continue normalLoop
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}
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break
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}
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}
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}
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// Process naughty character
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if _, err := fmt.Fprintf(c.w, `\%#03o`, bytes[i]); err != nil {
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return totalWritten, err
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}
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i++
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totalWritten++
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}
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return totalWritten, nil
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}
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// ColorSprintf returns a colored string from a format and arguments
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// arguments will be wrapped in ColoredValues to protect against color spoofing
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func ColorSprintf(format string, args ...interface{}) string {
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if len(args) > 0 {
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v := make([]interface{}, len(args))
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for i := 0; i < len(v); i++ {
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v[i] = NewColoredValuePointer(&args[i])
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}
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return fmt.Sprintf(format, v...)
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}
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return format
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}
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// ColorFprintf will write to the provided writer similar to ColorSprintf
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func ColorFprintf(w io.Writer, format string, args ...interface{}) (int, error) {
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if len(args) > 0 {
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v := make([]interface{}, len(args))
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for i := 0; i < len(v); i++ {
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v[i] = NewColoredValuePointer(&args[i])
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}
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return fmt.Fprintf(w, format, v...)
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}
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return fmt.Fprint(w, format)
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}
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// ColorFormatted structs provide their own colored string when formatted with ColorSprintf
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type ColorFormatted interface {
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// ColorFormat provides the colored representation of the value
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ColorFormat(s fmt.State)
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}
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var colorFormattedType = reflect.TypeOf((*ColorFormatted)(nil)).Elem()
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// ColoredValue will Color the provided value
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type ColoredValue struct {
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colorBytes *[]byte
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resetBytes *[]byte
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Value *interface{}
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}
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// NewColoredValue is a helper function to create a ColoredValue from a Value
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// If no color is provided it defaults to Bold with standard Reset
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// If a ColoredValue is provided it is not changed
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func NewColoredValue(value interface{}, color ...ColorAttribute) *ColoredValue {
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return NewColoredValuePointer(&value, color...)
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}
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// NewColoredValuePointer is a helper function to create a ColoredValue from a Value Pointer
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// If no color is provided it defaults to Bold with standard Reset
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// If a ColoredValue is provided it is not changed
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func NewColoredValuePointer(value *interface{}, color ...ColorAttribute) *ColoredValue {
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if val, ok := (*value).(*ColoredValue); ok {
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return val
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}
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if len(color) > 0 {
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bytes := ColorBytes(color...)
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return &ColoredValue{
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colorBytes: &bytes,
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resetBytes: &resetBytes,
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Value: value,
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}
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}
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return &ColoredValue{
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colorBytes: &fgBoldBytes,
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resetBytes: &resetBytes,
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Value: value,
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}
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}
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// NewColoredValueBytes creates a value from the provided value with color bytes
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// If a ColoredValue is provided it is not changed
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func NewColoredValueBytes(value interface{}, colorBytes *[]byte) *ColoredValue {
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if val, ok := value.(*ColoredValue); ok {
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return val
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}
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return &ColoredValue{
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colorBytes: colorBytes,
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resetBytes: &resetBytes,
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Value: &value,
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}
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}
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// NewColoredIDValue is a helper function to create a ColoredValue from a Value
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// The Value will be colored with FgCyan
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// If a ColoredValue is provided it is not changed
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func NewColoredIDValue(value interface{}) *ColoredValue {
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return NewColoredValueBytes(value, &fgCyanBytes)
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}
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// Format will format the provided value and protect against ANSI color spoofing within the value
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// If the wrapped value is ColorFormatted and the format is "%-v" then its ColorString will
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// be used. It is presumed that this ColorString is safe.
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func (cv *ColoredValue) Format(s fmt.State, c rune) {
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if c == 'v' && s.Flag('-') {
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if val, ok := (*cv.Value).(ColorFormatted); ok {
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val.ColorFormat(s)
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return
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}
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v := reflect.ValueOf(*cv.Value)
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t := v.Type()
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if reflect.PtrTo(t).Implements(colorFormattedType) {
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vp := reflect.New(t)
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vp.Elem().Set(v)
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val := vp.Interface().(ColorFormatted)
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val.ColorFormat(s)
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return
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}
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}
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s.Write(*cv.colorBytes)
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fmt.Fprintf(&protectedANSIWriter{w: s}, fmtString(s, c), *(cv.Value))
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s.Write(*cv.resetBytes)
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}
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// SetColorBytes will allow a user to set the colorBytes of a colored value
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func (cv *ColoredValue) SetColorBytes(colorBytes []byte) {
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cv.colorBytes = &colorBytes
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}
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// SetColorBytesPointer will allow a user to set the colorBytes pointer of a colored value
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func (cv *ColoredValue) SetColorBytesPointer(colorBytes *[]byte) {
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cv.colorBytes = colorBytes
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}
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// SetResetBytes will allow a user to set the resetBytes pointer of a colored value
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func (cv *ColoredValue) SetResetBytes(resetBytes []byte) {
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cv.resetBytes = &resetBytes
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}
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// SetResetBytesPointer will allow a user to set the resetBytes pointer of a colored value
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func (cv *ColoredValue) SetResetBytesPointer(resetBytes *[]byte) {
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cv.resetBytes = resetBytes
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}
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func fmtString(s fmt.State, c rune) string {
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var width, precision string
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base := make([]byte, 0, 8)
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base = append(base, '%')
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for _, c := range []byte(" +-#0") {
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if s.Flag(int(c)) {
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base = append(base, c)
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}
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}
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if w, ok := s.Width(); ok {
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width = strconv.Itoa(w)
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}
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if p, ok := s.Precision(); ok {
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precision = "." + strconv.Itoa(p)
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}
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return fmt.Sprintf("%s%s%s%c", base, width, precision, c)
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}
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func init() {
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for attr, from := range colorAttributeToString {
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colorAttributeFromString[strings.ToLower(from)] = attr
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}
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}
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