Handle multiple conditions in policies (#7079)

Fixes #7078

pkg/policy/condition/func.go

@@ -71,8 +71,14 @@ func (functions Functions) MarshalJSON() ([]byte, error) {
 	nm := make(map[name]map[Key]ValueSet)
 
 	for _, f := range functions {
+		if _, ok := nm[f.name()]; ok {
+			for k, v := range f.toMap() {
+				nm[f.name()][k] = v
+			}
+		} else {
 			nm[f.name()] = f.toMap()
 		}
+	}
 
 	return json.Marshal(nm)
 }

pkg/policy/condition/func_test.go

@@ -273,18 +273,73 @@ func TestFunctionsUnmarshalJSON(t *testing.T) {
 "DateEquals": { "aws:CurrentTime": "2013-06-30T00:00:00Z" }
 }`)
 
+	case5Data := []byte(`{
+    "StringLike": {
+        "s3:x-amz-metadata-directive": "REPL*"
+    },
+    "StringEquals": {
+        "s3:x-amz-copy-source": "mybucket/myobject",
+        "s3:prefix": [
+           "",
+           "home/"
+        ],
+        "s3:delimiter": [
+           "/"
+        ]
+    },
+    "StringNotEquals": {
+        "s3:x-amz-server-side-encryption": "AES256"
+    },
+    "NotIpAddress": {
+        "aws:SourceIp": [
+            "10.1.10.0/24",
+            "10.10.1.0/24"
+        ]
+    },
+    "StringNotLike": {
+        "s3:x-amz-storage-class": "STANDARD"
+    },
+    "Null": {
+        "s3:x-amz-server-side-encryption-customer-algorithm": true
+    },
+    "IpAddress": {
+        "aws:SourceIp": [
+            "192.168.1.0/24",
+            "192.168.2.0/24"
+        ]
+    }
+}`)
+
+	func2_1, err := newStringEqualsFunc(S3XAmzCopySource, NewValueSet(NewStringValue("mybucket/myobject")))
+	if err != nil {
+		t.Fatalf("unexpected error. %v\n", err)
+	}
+
+	func2_2, err := newStringEqualsFunc(S3Prefix, NewValueSet(NewStringValue(""), NewStringValue("home/")))
+	if err != nil {
+		t.Fatalf("unexpected error. %v\n", err)
+	}
+
+	func2_3, err := newStringEqualsFunc(S3Delimiter, NewValueSet(NewStringValue("/")))
+	if err != nil {
+		t.Fatalf("unexpected error. %v\n", err)
+	}
+
 	testCases := []struct {
 		data           []byte
 		expectedResult Functions
 		expectErr      bool
 	}{
+		// Success case, basic conditions.
 		{case1Data, NewFunctions(func1, func2, func3, func4, func5, func6, func7), false},
-		// duplicate condition error.
+		// Duplicate conditions, success case only one value is preserved.
 		{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},
 	}
 
 	for i, testCase := range testCases {