Allow functions/transforms in .env fields to transform values before

returning

configs/transform/env.py

@@ -1,4 +1,6 @@
 from pprint import pprint
+import tempfile
+import base64
 import os
 
 class Env:
@@ -9,9 +11,32 @@ class Env:
     def transform(self, config, vault):
         out = []
         for k in self.config["fields"].keys():
-            value = vault.resolve(config, self.config["fields"][k])
+            value = self.config["fields"][k]
+            value = self._decode(value, config, vault)
             if value is None:
                 out.append('# ' + k + '=null')
             else:
                 out.append(k + '="' + value + '"')
         return os.linesep.join(out)
+
+    def _decode(self, value, config, vault):
+        if type(value) is dict:
+            if len(value) != 1:
+                raise Exception('Malformed object literal')
+
+            if 'literal' in value:
+                return value['literal']
+            elif 'vault' in value:
+                return vault.resolve(config, self._decode(value['vault'], config, vault))
+            elif 'file' in value:
+                temp = tempfile.NamedTemporaryFile(delete=False, prefix='configs')
+                temp.write(self._decode(value['file'], config, vault).encode('utf-8'))
+                temp.close()
+                return temp.name
+            elif 'base64' in value:
+                return base64.b64decode(self._decode(value['base64'], config, vault)).decode('utf-8')
+            else:
+                raise Exception('Malformed object literal -- unknown: ' + value.keys()[0])
+
+        else:
+            return vault.resolve(config, value)