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sql.go
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sql.go
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package logger
import (
"database/sql/driver"
"fmt"
"reflect"
"regexp"
"strconv"
"strings"
"time"
"unicode"
"gorm.io/gorm/utils"
)
const (
tmFmtWithMS = "2006-01-02 15:04:05.999"
tmFmtZero = "0000-00-00 00:00:00"
nullStr = "NULL"
)
func isPrintable(s string) bool {
for _, r := range s {
if !unicode.IsPrint(r) {
return false
}
}
return true
}
// A list of Go types that should be converted to SQL primitives
var convertibleTypes = []reflect.Type{reflect.TypeOf(time.Time{}), reflect.TypeOf(false), reflect.TypeOf([]byte{})}
// RegEx matches only numeric values
var numericPlaceholderRe = regexp.MustCompile(`\$\d+\$`)
// ExplainSQL generate SQL string with given parameters, the generated SQL is expected to be used in logger, execute it might introduce a SQL injection vulnerability
func ExplainSQL(sql string, numericPlaceholder *regexp.Regexp, escaper string, avars ...interface{}) string {
var (
convertParams func(interface{}, int)
vars = make([]string, len(avars))
)
convertParams = func(v interface{}, idx int) {
switch v := v.(type) {
case bool:
vars[idx] = strconv.FormatBool(v)
case time.Time:
if v.IsZero() {
vars[idx] = escaper + tmFmtZero + escaper
} else {
vars[idx] = escaper + v.Format(tmFmtWithMS) + escaper
}
case *time.Time:
if v != nil {
if v.IsZero() {
vars[idx] = escaper + tmFmtZero + escaper
} else {
vars[idx] = escaper + v.Format(tmFmtWithMS) + escaper
}
} else {
vars[idx] = nullStr
}
case driver.Valuer:
reflectValue := reflect.ValueOf(v)
if v != nil && reflectValue.IsValid() && ((reflectValue.Kind() == reflect.Ptr && !reflectValue.IsNil()) || reflectValue.Kind() != reflect.Ptr) {
r, _ := v.Value()
convertParams(r, idx)
} else {
vars[idx] = nullStr
}
case fmt.Stringer:
reflectValue := reflect.ValueOf(v)
switch reflectValue.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
vars[idx] = fmt.Sprintf("%d", reflectValue.Interface())
case reflect.Float32, reflect.Float64:
vars[idx] = fmt.Sprintf("%.6f", reflectValue.Interface())
case reflect.Bool:
vars[idx] = fmt.Sprintf("%t", reflectValue.Interface())
case reflect.String:
vars[idx] = escaper + strings.ReplaceAll(fmt.Sprintf("%v", v), escaper, escaper+escaper) + escaper
default:
if v != nil && reflectValue.IsValid() && ((reflectValue.Kind() == reflect.Ptr && !reflectValue.IsNil()) || reflectValue.Kind() != reflect.Ptr) {
vars[idx] = escaper + strings.ReplaceAll(fmt.Sprintf("%v", v), escaper, escaper+escaper) + escaper
} else {
vars[idx] = nullStr
}
}
case []byte:
if s := string(v); isPrintable(s) {
vars[idx] = escaper + strings.ReplaceAll(s, escaper, escaper+escaper) + escaper
} else {
vars[idx] = escaper + "<binary>" + escaper
}
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
vars[idx] = utils.ToString(v)
case float32:
vars[idx] = strconv.FormatFloat(float64(v), 'f', -1, 32)
case float64:
vars[idx] = strconv.FormatFloat(v, 'f', -1, 64)
case string:
vars[idx] = escaper + strings.ReplaceAll(v, escaper, escaper+escaper) + escaper
default:
rv := reflect.ValueOf(v)
if v == nil || !rv.IsValid() || rv.Kind() == reflect.Ptr && rv.IsNil() {
vars[idx] = nullStr
} else if valuer, ok := v.(driver.Valuer); ok {
v, _ = valuer.Value()
convertParams(v, idx)
} else if rv.Kind() == reflect.Ptr && !rv.IsZero() {
convertParams(reflect.Indirect(rv).Interface(), idx)
} else {
for _, t := range convertibleTypes {
if rv.Type().ConvertibleTo(t) {
convertParams(rv.Convert(t).Interface(), idx)
return
}
}
vars[idx] = escaper + strings.ReplaceAll(fmt.Sprint(v), escaper, escaper+escaper) + escaper
}
}
}
for idx, v := range avars {
convertParams(v, idx)
}
if numericPlaceholder == nil {
var idx int
var newSQL strings.Builder
for _, v := range []byte(sql) {
if v == '?' {
if len(vars) > idx {
newSQL.WriteString(vars[idx])
idx++
continue
}
}
newSQL.WriteByte(v)
}
sql = newSQL.String()
} else {
sql = numericPlaceholder.ReplaceAllString(sql, "$$$1$$")
sql = numericPlaceholderRe.ReplaceAllStringFunc(sql, func(v string) string {
num := v[1 : len(v)-1]
n, _ := strconv.Atoi(num)
// position var start from 1 ($1, $2)
n -= 1
if n >= 0 && n <= len(vars)-1 {
return vars[n]
}
return v
})
}
return sql
}