Create parameter data builder

api/Cargo.toml

@@ -8,6 +8,7 @@ workspace = ".."
 arrayref = "0.3"
 base64 = "0.9"
 chrono = "0.4"
+derive_builder = "0.5"
 failure = "0.1"
 failure_derive = "0.1"
 hkdf = "0.3"

api/src/action/params.rs

@@ -149,7 +149,8 @@ impl<'a> Params<'a> {
 }
 
 /// The parameters data object, that is sent to the server.
-#[derive(Clone, Debug, Serialize)]
+// TODO: make sure downloads are in-bound when using the builder
+#[derive(Clone, Debug, Builder, Serialize)]
 pub struct ParamsData {
     /// The number of times this file may be downloaded.
     /// This value must be in the `(0,20)` bounds, as enforced by Send servers.

api/src/lib.rs

@@ -1,5 +1,7 @@
 #[macro_use]
 extern crate arrayref;
+#[macro_use]
+extern crate derive_builder;
 extern crate failure;
 #[macro_use]
 extern crate failure_derive;