[#63] iam: Support tag keys

Support:
* aws:PrincipalTag
* aws:ResourceTag
* aws:Request

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

iam/converter.go

@@ -9,6 +9,7 @@ import (
 	"unicode/utf8"
 
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
+	"git.frostfs.info/TrueCloudLab/policy-engine/schema/common"
 )
 
 const (
@@ -62,7 +63,11 @@ const (
 	s3ActionPutObjectVersionTagging          = "s3:PutObjectVersionTagging"
 )
 
-const condKeyAWSPrincipalARN = "aws:PrincipalArn"
+const (
+	condKeyAWSPrincipalARN       = "aws:PrincipalArn"
+	condKeyAWSPrincipalTagPrefix = "aws:PrincipalTag/"
+	userClaimTagPrefix           = "tag-"
+)
 
 const (
 	// String condition operators.
@@ -175,7 +180,7 @@ func convertToChainCondition(c Conditions) ([]GroupedConditions, error) {
 				group.Conditions[i] = chain.Condition{
 					Op:     condType,
 					Object: chain.ObjectRequest,
-					Key:    key,
+					Key:    transformKey(key),
 					Value:  converted,
 				}
 			}
@@ -186,6 +191,15 @@ func convertToChainCondition(c Conditions) ([]GroupedConditions, error) {
 	return grouped, nil
 }
 
+func transformKey(key string) string {
+	tagName, isTag := strings.CutPrefix(key, condKeyAWSPrincipalTagPrefix)
+	if isTag {
+		return fmt.Sprintf(common.PropertyKeyFormatFrostFSIDUserClaim, userClaimTagPrefix+tagName)
+	}
+
+	return key
+}
+
 func getConditionTypeAndConverter(op string) (chain.ConditionType, convertFunction, error) {
 	switch {
 	case strings.HasPrefix(op, "String"):

iam/converter_test.go

@@ -1500,6 +1500,64 @@ func TestResourceParsing(t *testing.T) {
 	}
 }
 
+func TestTagsConditions(t *testing.T) {
+	policy := `
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+	  "Principal": "*",
+      "Action": "s3:PutObjectTagging",
+      "Resource": "*",
+      "Condition": {
+        "StringEquals": {
+          "aws:PrincipalTag/department": "hr",
+          "aws:ResourceTag/owner": "hr-admin",
+          "aws:Request/scope": "*"
+        }
+      }
+    }
+  ]
+}
+`
+
+	expectedConditions := []chain.Condition{
+		{
+			Op:     chain.CondStringEquals,
+			Object: chain.ObjectRequest,
+			Key:    "frostfsid:userClaim/tag-department",
+			Value:  "hr",
+		},
+		{
+			Op:     chain.CondStringEquals,
+			Object: chain.ObjectRequest,
+			Key:    "aws:ResourceTag/owner",
+			Value:  "hr-admin",
+		},
+		{
+			Op:     chain.CondStringEquals,
+			Object: chain.ObjectRequest,
+			Key:    "aws:Request/scope",
+			Value:  "*",
+		},
+	}
+
+	var p Policy
+	err := json.Unmarshal([]byte(policy), &p)
+	require.NoError(t, err)
+
+	s3Chain, err := ConvertToS3Chain(p, newMockUserResolver(nil, nil, ""))
+	require.NoError(t, err)
+	require.Len(t, s3Chain.Rules, 1)
+	require.ElementsMatch(t, expectedConditions, s3Chain.Rules[0].Condition)
+
+	nativeChain, err := ConvertToNativeChain(p, newMockUserResolver(nil, nil, ""))
+	require.NoError(t, err)
+	require.Len(t, nativeChain.Rules, 1)
+	require.ElementsMatch(t, expectedConditions, nativeChain.Rules[0].Condition)
+}
+
 func requireChainRulesMatch(t *testing.T, expected, actual []chain.Rule) {
 	require.Equal(t, len(expected), len(actual), "length of chain rules differ")
 

schema/common/consts.go

@@ -2,4 +2,6 @@ package common
 
 const (
 	PropertyKeyFrostFSIDGroupID = "frostfsid:groupID"
+
+	PropertyKeyFormatFrostFSIDUserClaim = "frostfsid:userClaim/%s"
 )