Add numeric/date policy conditions (#9233)

add new policy conditions

- NumericEquals
- NumericNotEquals
- NumericLessThan
- NumericLessThanEquals
- NumericGreaterThan
- NumericGreaterThanEquals
- DateEquals
- DateNotEquals
- DateLessThan
- DateLessThanEquals
- DateGreaterThan
- DateGreaterThanEquals

pkg/bucket/policy/condition/datelessthanfunc.go

@@ -0,0 +1,153 @@
+/*
+ * 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"
+	"time"
+)
+
+func toDateLessThanFuncString(n name, key Key, value time.Time) string {
+	return fmt.Sprintf("%v:%v:%v", n, key, value.Format(time.RFC3339))
+}
+
+// dateLessThanFunc - 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 dateLessThanFunc struct {
+	k     Key
+	value time.Time
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is in
+// condition values.
+func (f dateLessThanFunc) 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
+	}
+
+	t, err := time.Parse(time.RFC3339, requestValue[0])
+	if err != nil {
+		return false
+	}
+
+	return t.Before(f.value)
+}
+
+// key() - returns condition key which is used by this condition function.
+func (f dateLessThanFunc) key() Key {
+	return f.k
+}
+
+// name() - returns "DateLessThan" condition name.
+func (f dateLessThanFunc) name() name {
+	return dateLessThan
+}
+
+func (f dateLessThanFunc) String() string {
+	return toDateLessThanFuncString(dateLessThan, f.k, f.value)
+}
+
+// toMap - returns map representation of this function.
+func (f dateLessThanFunc) toMap() map[Key]ValueSet {
+	if !f.k.IsValid() {
+		return nil
+	}
+
+	values := NewValueSet()
+	values.Add(NewStringValue(f.value.Format(time.RFC3339)))
+
+	return map[Key]ValueSet{
+		f.k: values,
+	}
+}
+
+// dateNotEqualsFunc - 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 dateLessThanEqualsFunc struct {
+	dateLessThanFunc
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is NOT in
+// condition values.
+func (f dateLessThanEqualsFunc) 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
+	}
+
+	t, err := time.Parse(time.RFC3339, requestValue[0])
+	if err != nil {
+		return false
+	}
+
+	return t.Before(f.value) || t.Equal(f.value)
+}
+
+// name() - returns "DateNotEquals" condition name.
+func (f dateLessThanEqualsFunc) name() name {
+	return dateLessThanEquals
+}
+
+func (f dateLessThanEqualsFunc) String() string {
+	return toDateLessThanFuncString(dateNotEquals, f.dateLessThanFunc.k, f.dateLessThanFunc.value)
+}
+
+// newDateLessThanFunc - returns new DateLessThan function.
+func newDateLessThanFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToTime(dateLessThan, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDateLessThanFunc(key, v)
+}
+
+// NewDateLessThanFunc - returns new DateLessThan function.
+func NewDateLessThanFunc(key Key, value time.Time) (Function, error) {
+	return &dateLessThanFunc{key, value}, nil
+}
+
+// newDateNotEqualsFunc - returns new DateNotEquals function.
+func newDateLessThanEqualsFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToTime(dateNotEquals, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDateLessThanEqualsFunc(key, v)
+}
+
+// NewDateLessThanEqualsFunc - returns new DateNotEquals function.
+func NewDateLessThanEqualsFunc(key Key, value time.Time) (Function, error) {
+	return &dateLessThanEqualsFunc{dateLessThanFunc{key, value}}, nil
+}