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/binaryequalsfunc.go

@@ -111,6 +111,10 @@ func validateBinaryEqualsValues(n name, key Key, values set.StringSet) error {
 			if s != "COPY" && s != "REPLACE" {
 				return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzMetadataDirective, n)
 			}
+		case S3XAmzContentSha256:
+			if s == "" {
+				return fmt.Errorf("invalid empty value for '%v' for %v condition", S3XAmzContentSha256, n)
+			}
 		}
 		values.Add(s)
 	}

pkg/bucket/policy/condition/boolfunc.go

@@ -38,6 +38,10 @@ func (f booleanFunc) evaluate(values map[string][]string) bool {
 		requestValue = values[f.k.Name()]
 	}
 
+	if len(requestValue) == 0 {
+		return false
+	}
+
 	return f.value == requestValue[0]
 }
 

pkg/bucket/policy/condition/dateequalsfunc.go

@@ -0,0 +1,164 @@
+/*
+ * 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"
+	"time"
+)
+
+func toDateEqualsFuncString(n name, key Key, value time.Time) string {
+	return fmt.Sprintf("%v:%v:%v", n, key, value.Format(time.RFC3339))
+}
+
+// dateEqualsFunc - 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 dateEqualsFunc struct {
+	k     Key
+	value time.Time
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is in
+// condition values.
+func (f dateEqualsFunc) 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 f.value.Equal(t)
+}
+
+// key() - returns condition key which is used by this condition function.
+func (f dateEqualsFunc) key() Key {
+	return f.k
+}
+
+// name() - returns "DateEquals" condition name.
+func (f dateEqualsFunc) name() name {
+	return dateEquals
+}
+
+func (f dateEqualsFunc) String() string {
+	return toDateEqualsFuncString(dateEquals, f.k, f.value)
+}
+
+// toMap - returns map representation of this function.
+func (f dateEqualsFunc) 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 dateNotEqualsFunc struct {
+	dateEqualsFunc
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is NOT in
+// condition values.
+func (f dateNotEqualsFunc) evaluate(values map[string][]string) bool {
+	return !f.dateEqualsFunc.evaluate(values)
+}
+
+// name() - returns "DateNotEquals" condition name.
+func (f dateNotEqualsFunc) name() name {
+	return dateNotEquals
+}
+
+func (f dateNotEqualsFunc) String() string {
+	return toDateEqualsFuncString(dateNotEquals, f.dateEqualsFunc.k, f.dateEqualsFunc.value)
+}
+
+func valueToTime(n name, values ValueSet) (v time.Time, err error) {
+	if len(values) != 1 {
+		return v, fmt.Errorf("only one value is allowed for %s condition", n)
+	}
+
+	for vs := range values {
+		switch vs.GetType() {
+		case reflect.String:
+			s, err := vs.GetString()
+			if err != nil {
+				return v, err
+			}
+			if v, err = time.Parse(time.RFC3339, s); err != nil {
+				return v, fmt.Errorf("value %s must be a time.Time string for %s condition: %w", vs, n, err)
+			}
+		default:
+			return v, fmt.Errorf("value %s must be a time.Time for %s condition", vs, n)
+		}
+	}
+
+	return v, nil
+
+}
+
+// newDateEqualsFunc - returns new DateEquals function.
+func newDateEqualsFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToTime(dateEquals, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDateEqualsFunc(key, v)
+}
+
+// NewDateEqualsFunc - returns new DateEquals function.
+func NewDateEqualsFunc(key Key, value time.Time) (Function, error) {
+	return &dateEqualsFunc{key, value}, nil
+}
+
+// newDateNotEqualsFunc - returns new DateNotEquals function.
+func newDateNotEqualsFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToTime(dateNotEquals, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDateNotEqualsFunc(key, v)
+}
+
+// NewDateNotEqualsFunc - returns new DateNotEquals function.
+func NewDateNotEqualsFunc(key Key, value time.Time) (Function, error) {
+	return &dateNotEqualsFunc{dateEqualsFunc{key, value}}, nil
+}

pkg/bucket/policy/condition/dategreaterthanfunc.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 toDateGreaterThanFuncString(n name, key Key, value time.Time) string {
+	return fmt.Sprintf("%v:%v:%v", n, key, value.Format(time.RFC3339))
+}
+
+// dateGreaterThanFunc - 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 dateGreaterThanFunc struct {
+	k     Key
+	value time.Time
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is in
+// condition values.
+func (f dateGreaterThanFunc) 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.After(f.value)
+}
+
+// key() - returns condition key which is used by this condition function.
+func (f dateGreaterThanFunc) key() Key {
+	return f.k
+}
+
+// name() - returns "DateGreaterThan" condition name.
+func (f dateGreaterThanFunc) name() name {
+	return dateGreaterThan
+}
+
+func (f dateGreaterThanFunc) String() string {
+	return toDateGreaterThanFuncString(dateGreaterThan, f.k, f.value)
+}
+
+// toMap - returns map representation of this function.
+func (f dateGreaterThanFunc) 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 dateGreaterThanEqualsFunc struct {
+	dateGreaterThanFunc
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is NOT in
+// condition values.
+func (f dateGreaterThanEqualsFunc) 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.After(f.value) || t.Equal(f.value)
+}
+
+// name() - returns "DateNotEquals" condition name.
+func (f dateGreaterThanEqualsFunc) name() name {
+	return dateGreaterThanEquals
+}
+
+func (f dateGreaterThanEqualsFunc) String() string {
+	return toDateGreaterThanFuncString(dateNotEquals, f.dateGreaterThanFunc.k, f.dateGreaterThanFunc.value)
+}
+
+// newDateGreaterThanFunc - returns new DateGreaterThan function.
+func newDateGreaterThanFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToTime(dateGreaterThan, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDateGreaterThanFunc(key, v)
+}
+
+// NewDateGreaterThanFunc - returns new DateGreaterThan function.
+func NewDateGreaterThanFunc(key Key, value time.Time) (Function, error) {
+	return &dateGreaterThanFunc{key, value}, nil
+}
+
+// newDateNotEqualsFunc - returns new DateNotEquals function.
+func newDateGreaterThanEqualsFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToTime(dateNotEquals, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDateGreaterThanEqualsFunc(key, v)
+}
+
+// NewDateGreaterThanEqualsFunc - returns new DateNotEquals function.
+func NewDateGreaterThanEqualsFunc(key Key, value time.Time) (Function, error) {
+	return &dateGreaterThanEqualsFunc{dateGreaterThanFunc{key, value}}, nil
+}

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
+}

pkg/bucket/policy/condition/func.go

@@ -106,6 +106,18 @@ var conditionFuncMap = map[name]func(Key, ValueSet) (Function, error){
 	notIPAddress:              newNotIPAddressFunc,
 	null:                      newNullFunc,
 	boolean:                   newBooleanFunc,
+	numericEquals:             newNumericEqualsFunc,
+	numericNotEquals:          newNumericNotEqualsFunc,
+	numericLessThan:           newNumericLessThanFunc,
+	numericLessThanEquals:     newNumericLessThanEqualsFunc,
+	numericGreaterThan:        newNumericGreaterThanFunc,
+	numericGreaterThanEquals:  newNumericGreaterThanEqualsFunc,
+	dateEquals:                newDateEqualsFunc,
+	dateNotEquals:             newDateNotEqualsFunc,
+	dateLessThan:              newDateLessThanFunc,
+	dateLessThanEquals:        newDateLessThanEqualsFunc,
+	dateGreaterThan:           newDateGreaterThanFunc,
+	dateGreaterThanEquals:     newDateGreaterThanEqualsFunc,
 	// Add new conditions here.
 }
 

pkg/bucket/policy/condition/func_test.go

@@ -268,12 +268,7 @@ func TestFunctionsUnmarshalJSON(t *testing.T) {
 
 	case3Data := []byte(`{}`)
 
-	// Remove this test after supporting date conditions.
 	case4Data := []byte(`{
-"DateEquals": { "aws:CurrentTime": "2013-06-30T00:00:00Z" }
-}`)
-
-	case5Data := []byte(`{
     "StringLike": {
         "s3:x-amz-metadata-directive": "REPL*"
     },
@@ -336,10 +331,8 @@ func TestFunctionsUnmarshalJSON(t *testing.T) {
 		{case2Data, NewFunctions(func6), false},
 		// empty condition error.
 		{case3Data, nil, true},
-		// unsupported condition error.
-		{case4Data, nil, true},
 		// Success case multiple keys, same condition.
-		{case5Data, NewFunctions(func1, func2_1, func2_2, func2_3, func3, func4, func5, func6, func7), false},
+		{case4Data, NewFunctions(func1, func2_1, func2_2, func2_3, func3, func4, func5, func6, func7), false},
 	}
 
 	for i, testCase := range testCases {

pkg/bucket/policy/condition/key.go

@@ -43,6 +43,9 @@ const (
 	// PutObject API only.
 	S3XAmzMetadataDirective Key = "s3:x-amz-metadata-directive"
 
+	// S3XAmzContentSha256 - set a static content-sha256 for all calls for a given action.
+	S3XAmzContentSha256 = "s3:x-amz-content-sha256"
+
 	// S3XAmzStorageClass - key representing x-amz-storage-class HTTP header applicable to PutObject API
 	// only.
 	S3XAmzStorageClass Key = "s3:x-amz-storage-class"
@@ -59,6 +62,24 @@ const (
 	// S3MaxKeys - key representing max-keys query parameter of ListBucket API only.
 	S3MaxKeys Key = "s3:max-keys"
 
+	// S3ObjectLockRemainingRetentionDays - key representing object-lock-remaining-retention-days
+	// Enables enforcement of an object relative to the remaining retention days, you can set
+	// minimum and maximum allowable retention periods for a bucket using a bucket policy.
+	// This key are specific for s3:PutObjectRetention API.
+	S3ObjectLockRemainingRetentionDays Key = "s3:object-lock-remaining-retention-days"
+
+	// S3ObjectLockMode - key representing object-lock-mode
+	// Enables enforcement of the specified object retention mode
+	S3ObjectLockMode Key = "s3:object-lock-mode"
+
+	// S3ObjectLockRetainUntilDate - key representing object-lock-retain-util-date
+	// Enables enforcement of a specific retain-until-date
+	S3ObjectLockRetainUntilDate Key = "s3:object-lock-retain-until-date"
+
+	// S3ObjectLockLegalHold - key representing object-local-legal-hold
+	// Enables enforcement of the specified object legal hold status
+	S3ObjectLockLegalHold Key = "s3:object-lock-legal-hold"
+
 	// AWSReferer - key representing Referer header of any API.
 	AWSReferer Key = "aws:Referer"
 
@@ -94,10 +115,15 @@ var AllSupportedKeys = append([]Key{
 	S3XAmzServerSideEncryptionCustomerAlgorithm,
 	S3XAmzMetadataDirective,
 	S3XAmzStorageClass,
+	S3XAmzContentSha256,
 	S3LocationConstraint,
 	S3Prefix,
 	S3Delimiter,
 	S3MaxKeys,
+	S3ObjectLockRemainingRetentionDays,
+	S3ObjectLockMode,
+	S3ObjectLockLegalHold,
+	S3ObjectLockRetainUntilDate,
 	AWSReferer,
 	AWSSourceIP,
 	AWSUserAgent,
@@ -121,6 +147,7 @@ var CommonKeys = append([]Key{
 	AWSPrincipalType,
 	AWSUserID,
 	AWSUsername,
+	S3XAmzContentSha256,
 }, JWTKeys...)
 
 func substFuncFromValues(values map[string][]string) func(string) string {

pkg/bucket/policy/condition/name.go

@@ -35,6 +35,18 @@ const (
 	notIPAddress                   = "NotIpAddress"
 	null                           = "Null"
 	boolean                        = "Bool"
+	numericEquals                  = "NumericEquals"
+	numericNotEquals               = "NumericNotEquals"
+	numericLessThan                = "NumericLessThan"
+	numericLessThanEquals          = "NumericLessThanEquals"
+	numericGreaterThan             = "NumericGreaterThan"
+	numericGreaterThanEquals       = "NumericGreaterThanEquals"
+	dateEquals                     = "DateEquals"
+	dateNotEquals                  = "DateNotEquals"
+	dateLessThan                   = "DateLessThan"
+	dateLessThanEquals             = "DateLessThanEquals"
+	dateGreaterThan                = "DateGreaterThan"
+	dateGreaterThanEquals          = "DateGreaterThanEquals"
 )
 
 var supportedConditions = []name{
@@ -49,6 +61,18 @@ var supportedConditions = []name{
 	notIPAddress,
 	null,
 	boolean,
+	numericEquals,
+	numericNotEquals,
+	numericLessThan,
+	numericLessThanEquals,
+	numericGreaterThan,
+	numericGreaterThanEquals,
+	dateEquals,
+	dateNotEquals,
+	dateLessThan,
+	dateLessThanEquals,
+	dateGreaterThan,
+	dateGreaterThanEquals,
 	// Add new conditions here.
 }
 

pkg/bucket/policy/condition/numericequalsfunc.go

@@ -0,0 +1,168 @@
+/*
+ * 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
+}

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
+}

pkg/bucket/policy/condition/numericlessfunc.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 toNumericLessThanFuncString(n name, key Key, value int) string {
+	return fmt.Sprintf("%v:%v:%v", n, key, value)
+}
+
+// numericLessThanFunc - 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 numericLessThanFunc struct {
+	k     Key
+	value int
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is in
+// condition values.
+func (f numericLessThanFunc) 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 numericLessThanFunc) key() Key {
+	return f.k
+}
+
+// name() - returns "NumericLessThan" condition name.
+func (f numericLessThanFunc) name() name {
+	return numericLessThan
+}
+
+func (f numericLessThanFunc) String() string {
+	return toNumericLessThanFuncString(numericLessThan, f.k, f.value)
+}
+
+// toMap - returns map representation of this function.
+func (f numericLessThanFunc) toMap() map[Key]ValueSet {
+	if !f.k.IsValid() {
+		return nil
+	}
+
+	values := NewValueSet()
+	values.Add(NewIntValue(f.value))
+
+	return map[Key]ValueSet{
+		f.k: values,
+	}
+}
+
+// numericLessThanEqualsFunc - 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 numericLessThanEqualsFunc struct {
+	numericLessThanFunc
+}
+
+// evaluate() - evaluates to check whether value by Key in given values is NOT in
+// condition values.
+func (f numericLessThanEqualsFunc) 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 "NumericLessThanEquals" condition name.
+func (f numericLessThanEqualsFunc) name() name {
+	return numericLessThanEquals
+}
+
+func (f numericLessThanEqualsFunc) String() string {
+	return toNumericLessThanFuncString(numericLessThanEquals, f.numericLessThanFunc.k, f.numericLessThanFunc.value)
+}
+
+// newNumericLessThanFunc - returns new NumericLessThan function.
+func newNumericLessThanFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToInt(numericLessThan, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewNumericLessThanFunc(key, v)
+}
+
+// NewNumericLessThanFunc - returns new NumericLessThan function.
+func NewNumericLessThanFunc(key Key, value int) (Function, error) {
+	return &numericLessThanFunc{key, value}, nil
+}
+
+// newNumericLessThanEqualsFunc - returns new NumericLessThanEquals function.
+func newNumericLessThanEqualsFunc(key Key, values ValueSet) (Function, error) {
+	v, err := valueToInt(numericLessThanEquals, values)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewNumericLessThanEqualsFunc(key, v)
+}
+
+// NewNumericLessThanEqualsFunc - returns new NumericLessThanEquals function.
+func NewNumericLessThanEqualsFunc(key Key, value int) (Function, error) {
+	return &numericLessThanEqualsFunc{numericLessThanFunc{key, value}}, nil
+}

pkg/bucket/policy/condition/stringequalsfunc.go

@@ -143,6 +143,10 @@ func validateStringEqualsValues(n name, key Key, values set.StringSet) error {
 			if s != "COPY" && s != "REPLACE" {
 				return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzMetadataDirective, n)
 			}
+		case S3XAmzContentSha256:
+			if s == "" {
+				return fmt.Errorf("invalid empty value for '%v' for %v condition", S3XAmzContentSha256, n)
+			}
 		}
 	}