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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package format
import (
"encoding/json"
"time"
"unicode/utf8"
"code.superseriousbusiness.org/gotosocial/internal/log/level"
"codeberg.org/gruf/go-byteutil"
"codeberg.org/gruf/go-caller"
"codeberg.org/gruf/go-kv/v2"
)
type JSON struct{ Base }
func (fmt *JSON) Format(buf *byteutil.Buffer, stamp time.Time, pc uintptr, lvl level.LEVEL, kvs []kv.Field, msg string) {
// Prepend opening JSON brace.
buf.B = append(buf.B, `{`...)
if fmt.TimeFormat != "" {
// Append JSON formatted timestamp string.
buf.B = append(buf.B, `"timestamp":"`...)
fmt.AppendFormatStamp(buf, stamp)
buf.B = append(buf.B, `", `...)
}
// Append JSON formatted caller func.
buf.B = append(buf.B, `"func":"`...)
buf.B = append(buf.B, caller.Get(pc)...)
buf.B = append(buf.B, `", `...)
if lvl != level.UNSET {
// Append JSON formatted level string.
buf.B = append(buf.B, `"level":"`...)
buf.B = append(buf.B, lvl.String()...)
buf.B = append(buf.B, `", `...)
}
// Append JSON formatted fields.
for _, field := range kvs {
appendStringJSON(buf, field.K)
buf.B = append(buf.B, `:`...)
b, _ := json.Marshal(field.V)
buf.B = append(buf.B, b...)
buf.B = append(buf.B, `, `...)
}
if msg != "" {
// Append JSON formatted msg string.
buf.B = append(buf.B, `"msg":`...)
appendStringJSON(buf, msg)
} else if string(buf.B[len(buf.B)-2:]) == ", " {
// Drop the trailing ", ".
buf.B = buf.B[:len(buf.B)-2]
}
// Append closing JSON brace.
buf.B = append(buf.B, `}`...)
}
// appendStringJSON is modified from the encoding/json.appendString()
// function, copied in here such that we can use it for key appending.
func appendStringJSON(buf *byteutil.Buffer, src string) {
const hex = "0123456789abcdef"
buf.B = append(buf.B, '"')
start := 0
for i := 0; i < len(src); {
if b := src[i]; b < utf8.RuneSelf {
if jsonSafeSet[b] {
i++
continue
}
buf.B = append(buf.B, src[start:i]...)
switch b {
case '\\', '"':
buf.B = append(buf.B, '\\', b)
case '\b':
buf.B = append(buf.B, '\\', 'b')
case '\f':
buf.B = append(buf.B, '\\', 'f')
case '\n':
buf.B = append(buf.B, '\\', 'n')
case '\r':
buf.B = append(buf.B, '\\', 'r')
case '\t':
buf.B = append(buf.B, '\\', 't')
default:
// This encodes bytes < 0x20 except for \b, \f, \n, \r and \t.
buf.B = append(buf.B, '\\', 'u', '0', '0', hex[b>>4], hex[b&0xF])
}
i++
start = i
continue
}
n := len(src) - i
if n > utf8.UTFMax {
n = utf8.UTFMax
}
c, size := utf8.DecodeRuneInString(src[i : i+n])
if c == utf8.RuneError && size == 1 {
buf.B = append(buf.B, src[start:i]...)
buf.B = append(buf.B, `\ufffd`...)
i += size
start = i
continue
}
// U+2028 is LINE SEPARATOR.
// U+2029 is PARAGRAPH SEPARATOR.
// They are both technically valid characters in JSON strings,
// but don't work in JSONP, which has to be evaluated as JavaScript,
// and can lead to security holes there. It is valid JSON to
// escape them, so we do so unconditionally.
// See https://en.wikipedia.org/wiki/JSON#Safety.
if c == '\u2028' || c == '\u2029' {
buf.B = append(buf.B, src[start:i]...)
buf.B = append(buf.B, '\\', 'u', '2', '0', '2', hex[c&0xF])
i += size
start = i
continue
}
i += size
}
buf.B = append(buf.B, src[start:]...)
buf.B = append(buf.B, '"')
}
var jsonSafeSet = [utf8.RuneSelf]bool{
' ': true,
'!': true,
'"': false,
'#': true,
'$': true,
'%': true,
'&': true,
'\'': true,
'(': true,
')': true,
'*': true,
'+': true,
',': true,
'-': true,
'.': true,
'/': true,
'0': true,
'1': true,
'2': true,
'3': true,
'4': true,
'5': true,
'6': true,
'7': true,
'8': true,
'9': true,
':': true,
';': true,
'<': true,
'=': true,
'>': true,
'?': true,
'@': true,
'A': true,
'B': true,
'C': true,
'D': true,
'E': true,
'F': true,
'G': true,
'H': true,
'I': true,
'J': true,
'K': true,
'L': true,
'M': true,
'N': true,
'O': true,
'P': true,
'Q': true,
'R': true,
'S': true,
'T': true,
'U': true,
'V': true,
'W': true,
'X': true,
'Y': true,
'Z': true,
'[': true,
'\\': false,
']': true,
'^': true,
'_': true,
'`': true,
'a': true,
'b': true,
'c': true,
'd': true,
'e': true,
'f': true,
'g': true,
'h': true,
'i': true,
'j': true,
'k': true,
'l': true,
'm': true,
'n': true,
'o': true,
'p': true,
'q': true,
'r': true,
's': true,
't': true,
'u': true,
'v': true,
'w': true,
'x': true,
'y': true,
'z': true,
'{': true,
'|': true,
'}': true,
'~': true,
'\u007f': true,
}
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