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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand 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.
//
// go-algorand 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 go-algorand. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"encoding/base64"
"unicode"
"unicode/utf8"
"github.com/algorand/go-algorand/data/basics"
)
// unicodePrintable scan the input string str, and find if it contains any
// non-printable unicode characters. If so, it returns false, along with the
// printable characters that do appear in the input string. Otherwise, it
// returns true, along with a copy of the original string. The returned string
// printableString is gurenteed to be printable in all cases.
func unicodePrintable(str string) (isPrintable bool, printableString string) {
isPrintable = true
encRuneBuf := make([]byte, 8)
for _, r := range str {
if !unicode.IsPrint(r) {
isPrintable = false
} else {
n := utf8.EncodeRune(encRuneBuf, r)
printableString += string(encRuneBuf[:n])
}
}
return
}
func jsonPrintable(str string) bool {
// htmlSafeSet holds the value true if the ASCII character with the given
// array position can be safely represented inside a JSON string, embedded
// inside of HTML <script> tags, without any additional escaping.
//
// All values are true except for the ASCII control characters (0-31), the
// double quote ("), the backslash character ("\"), HTML opening and closing
// tags ("<" and ">"), and the ampersand ("&").
var htmlSafeSet = [utf8.RuneSelf]bool{
' ': true,
'!': true,
'"': false,
'#': true,
'$': true,
'%': true,
'&': false,
'\'': 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,
'<': false,
'=': true,
'>': false,
'?': 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,
}
for _, r := range str {
if r >= utf8.RuneSelf {
return false
}
if htmlSafeSet[r] == false {
return false
}
}
return true
}
func heuristicFormatStr(str string) string {
// See if we can print it as a json output
if jsonPrintable(str) {
return str
}
// otherwise, see if it's a 32 byte string that could be printed as an address
if len(str) == 32 {
var addr basics.Address
copy(addr[:], []byte(str))
return addr.String()
}
// otherwise, use the default json formatter to output the byte array.
return str
}
func heuristicFormatKey(key string) string {
return heuristicFormatStr(key)
}
func heuristicFormatVal(val basics.TealValue) basics.TealValue {
if val.Type == basics.TealUintType {
return val
}
val.Bytes = heuristicFormatStr(val.Bytes)
return val
}
func heuristicFormat(state map[string]basics.TealValue) map[string]basics.TealValue {
result := make(map[string]basics.TealValue, len(state))
for k, v := range state {
result[heuristicFormatKey(k)] = heuristicFormatVal(v)
}
return result
}
// Encode bytes as an app call bytes string.
// Will use `str:` if the string is printable, otherwise `b64:`.
func encodeBytesAsAppCallBytes(value []byte) string {
if isPrintable, _ := unicodePrintable(string(value)); isPrintable {
return "str:" + string(value)
}
return "b64:" + base64.StdEncoding.EncodeToString(value)
}
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