Feat/environment variables in workflow (#6515)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/fields/workflow_fields.py

@@ -1,8 +1,38 @@
 from flask_restful import fields
 
+from core.app.segments import SecretVariable, Variable
+from core.helper import encrypter
 from fields.member_fields import simple_account_fields
 from libs.helper import TimestampField
 
+
+class EnvironmentVariableField(fields.Raw):
+    def format(self, value):
+        # Mask secret variables values in environment_variables
+        if isinstance(value, SecretVariable):
+            return {
+                'id': value.id,
+                'name': value.name,
+                'value': encrypter.obfuscated_token(value.value),
+                'value_type': value.value_type.value,
+            }
+        elif isinstance(value, Variable):
+            return {
+                'id': value.id,
+                'name': value.name,
+                'value': value.value,
+                'value_type': value.value_type.value,
+            }
+        return value
+
+
+environment_variable_fields = {
+    'id': fields.String,
+    'name': fields.String,
+    'value': fields.Raw,
+    'value_type': fields.String(attribute='value_type.value'),
+}
+
 workflow_fields = {
     'id': fields.String,
     'graph': fields.Raw(attribute='graph_dict'),
@@ -13,4 +43,5 @@ workflow_fields = {
     'updated_by': fields.Nested(simple_account_fields, attribute='updated_by_account', allow_null=True),
     'updated_at': TimestampField,
     'tool_published': fields.Boolean,
+    'environment_variables': fields.List(EnvironmentVariableField()),
 }