/
mask.go
72 lines (61 loc) · 1.75 KB
/
mask.go
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// Copyright 2018 BBVA
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mask
import (
"crypto/sha256"
"fmt"
"strconv"
)
func hashSha256(value interface{}) interface{} {
var aStringToHash string
switch v := value.(type) {
case string:
aStringToHash = v
case []uint8:
aStringToHash = string([]byte(v))
case int:
aStringToHash = strconv.Itoa(v)
case int64:
aStringToHash = strconv.FormatInt(v, 10)
case float64:
aStringToHash = strconv.FormatFloat(v, 'f', -1, 64)
}
sm := fmt.Sprintf("%x", sha256.Sum256([]byte(aStringToHash)))
return string(sm)
}
func identity(value interface{}) interface{} {
return value
}
// Factory generates the function that convert the row
// Maybe for security must fail if field is not defined to avoid
// accidental leaks
func Factory(masks []string) func([]interface{}) ([]interface{}, error) {
masker := make([]func(interface{}) interface{}, len(masks))
//TODO: Memoize field values
for i, method := range masks {
switch method {
case "sha256":
masker[i] = hashSha256
default:
masker[i] = identity
}
}
return func(current []interface{}) ([]interface{}, error) {
row := make([]interface{}, len(masks))
for i, value := range current {
row[i] = masker[i](value)
}
return row, nil
}
}