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numericequalsfunc.go
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/
numericequalsfunc.go
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/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* 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 condition
import (
"fmt"
"net/http"
"reflect"
"strconv"
)
func toNumericEqualsFuncString(n name, key Key, value int) string {
return fmt.Sprintf("%v:%v:%v", n, key, value)
}
// numericEqualsFunc - String equals function. It checks whether value by Key in given
// values map is in condition values.
// For example,
// - if values = ["mybucket/foo"], at evaluate() it returns whether string
// in value map for Key is in values.
type numericEqualsFunc struct {
k Key
value int
}
// evaluate() - evaluates to check whether value by Key in given values is in
// condition values.
func (f numericEqualsFunc) evaluate(values map[string][]string) bool {
requestValue, ok := values[http.CanonicalHeaderKey(f.k.Name())]
if !ok {
requestValue = values[f.k.Name()]
}
if len(requestValue) == 0 {
return false
}
rvInt, err := strconv.Atoi(requestValue[0])
if err != nil {
return false
}
return f.value == rvInt
}
// key() - returns condition key which is used by this condition function.
func (f numericEqualsFunc) key() Key {
return f.k
}
// name() - returns "NumericEquals" condition name.
func (f numericEqualsFunc) name() name {
return numericEquals
}
func (f numericEqualsFunc) String() string {
return toNumericEqualsFuncString(numericEquals, f.k, f.value)
}
// toMap - returns map representation of this function.
func (f numericEqualsFunc) toMap() map[Key]ValueSet {
if !f.k.IsValid() {
return nil
}
values := NewValueSet()
values.Add(NewIntValue(f.value))
return map[Key]ValueSet{
f.k: values,
}
}
// numericNotEqualsFunc - String not equals function. It checks whether value by Key in
// given values is NOT in condition values.
// For example,
// - if values = ["mybucket/foo"], at evaluate() it returns whether string
// in value map for Key is NOT in values.
type numericNotEqualsFunc struct {
numericEqualsFunc
}
// evaluate() - evaluates to check whether value by Key in given values is NOT in
// condition values.
func (f numericNotEqualsFunc) evaluate(values map[string][]string) bool {
return !f.numericEqualsFunc.evaluate(values)
}
// name() - returns "NumericNotEquals" condition name.
func (f numericNotEqualsFunc) name() name {
return numericNotEquals
}
func (f numericNotEqualsFunc) String() string {
return toNumericEqualsFuncString(numericNotEquals, f.numericEqualsFunc.k, f.numericEqualsFunc.value)
}
func valueToInt(n name, values ValueSet) (v int, err error) {
if len(values) != 1 {
return -1, fmt.Errorf("only one value is allowed for %s condition", n)
}
for vs := range values {
switch vs.GetType() {
case reflect.Int:
if v, err = vs.GetInt(); err != nil {
return -1, err
}
case reflect.String:
s, err := vs.GetString()
if err != nil {
return -1, err
}
if v, err = strconv.Atoi(s); err != nil {
return -1, fmt.Errorf("value %s must be a int for %s condition: %w", vs, n, err)
}
default:
return -1, fmt.Errorf("value %s must be a int for %s condition", vs, n)
}
}
return v, nil
}
// newNumericEqualsFunc - returns new NumericEquals function.
func newNumericEqualsFunc(key Key, values ValueSet) (Function, error) {
v, err := valueToInt(numericEquals, values)
if err != nil {
return nil, err
}
return NewNumericEqualsFunc(key, v)
}
// NewNumericEqualsFunc - returns new NumericEquals function.
func NewNumericEqualsFunc(key Key, value int) (Function, error) {
return &numericEqualsFunc{key, value}, nil
}
// newNumericNotEqualsFunc - returns new NumericNotEquals function.
func newNumericNotEqualsFunc(key Key, values ValueSet) (Function, error) {
v, err := valueToInt(numericNotEquals, values)
if err != nil {
return nil, err
}
return NewNumericNotEqualsFunc(key, v)
}
// NewNumericNotEqualsFunc - returns new NumericNotEquals function.
func NewNumericNotEqualsFunc(key Key, value int) (Function, error) {
return &numericNotEqualsFunc{numericEqualsFunc{key, value}}, nil
}