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/numericgreaterfunc.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"
+	"strconv"
+)
+
+func toNumericGreaterThanFuncString(n name, key Key, value int) string {
+	return fmt.Sprintf("%v:%v:%v", n, key, value)
+}
+
+// numericGreaterThanFunc - 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 numericGreaterThanFunc struct {
+	k     Key
+	value int
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is in
+// condition values.
+func (f numericGreaterThanFunc) 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 rvInt > f.value
+}
+
+// key() - returns condition key which is used by this condition function.
+func (f numericGreaterThanFunc) key() Key {
+	return f.k
+}
+
+// name() - returns "NumericGreaterThan" condition name.
+func (f numericGreaterThanFunc) name() name {
+	return numericGreaterThan
+}
+
+func (f numericGreaterThanFunc) String() string {
+	return toNumericGreaterThanFuncString(numericGreaterThan, f.k, f.value)
+}
+
+// toMap - returns map representation of this function.
+func (f numericGreaterThanFunc) toMap() map[Key]ValueSet {
+	if !f.k.IsValid() {
+		return nil
+	}
+
+	values := NewValueSet()
+	values.Add(NewIntValue(f.value))
+
+	return map[Key]ValueSet{
+		f.k: values,
+	}
+}
+
+// numericGreaterThanEqualsFunc - 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 numericGreaterThanEqualsFunc struct {
+	numericGreaterThanFunc
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is NOT in
+// condition values.
+func (f numericGreaterThanEqualsFunc) 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 rvInt >= f.value
+}
+
+// name() - returns "NumericGreaterThanEquals" condition name.
+func (f numericGreaterThanEqualsFunc) name() name {
+	return numericGreaterThanEquals
+}
+
+func (f numericGreaterThanEqualsFunc) String() string {
+	return toNumericGreaterThanFuncString(numericGreaterThanEquals, f.numericGreaterThanFunc.k, f.numericGreaterThanFunc.value)
+}
+
+// newNumericGreaterThanFunc - returns new NumericGreaterThan function.
+func newNumericGreaterThanFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToInt(numericGreaterThan, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewNumericGreaterThanFunc(key, v)
+}
+
+// NewNumericGreaterThanFunc - returns new NumericGreaterThan function.
+func NewNumericGreaterThanFunc(key Key, value int) (Function, error) {
+	return &numericGreaterThanFunc{key, value}, nil
+}
+
+// newNumericGreaterThanEqualsFunc - returns new NumericGreaterThanEquals function.
+func newNumericGreaterThanEqualsFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToInt(numericGreaterThanEquals, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewNumericGreaterThanEqualsFunc(key, v)
+}
+
+// NewNumericGreaterThanEqualsFunc - returns new NumericGreaterThanEquals function.
+func NewNumericGreaterThanEqualsFunc(key Key, value int) (Function, error) {
+	return &numericGreaterThanEqualsFunc{numericGreaterThanFunc{key, value}}, nil
+}