Merge pull request #81 from NordSecurity/null_str_conversion

Add option to convert null strings to empty

CHANGELOG.md

@@ -1,3 +1,7 @@
+### v0.8.1+v0.25.0
+
+- Add a configuration option `null_string_to_empty` to convert non-optional null strings to empty strings
+
 ----
 
 ### v0.8.0+v0.25.0

bindgen/src/gen_cs/mod.rs

@@ -38,6 +38,7 @@ pub struct Config {
     external_packages: HashMap<String, String>,
     global_methods_class_name: Option<String>,
     access_modifier: Option<String>,
+    null_string_to_empty: Option<bool>,
 }
 
 #[derive(Debug, Default, Clone, Serialize, Deserialize)]

bindgen/templates/StringHelper.cs

@@ -24,6 +24,13 @@ public override string Read(BigEndianStream stream) {
     }
 
     public override RustBuffer Lower(string value) {
+        {%- match config.null_string_to_empty %}
+        {%- when Some(true) %}
+        if (value == null) {
+            value = "";
+        }
+        {%- when _ %}
+        {%- endmatch %}
         var bytes = System.Text.Encoding.UTF8.GetBytes(value);
         var rbuf = RustBuffer.Alloc(bytes.Length);
         rbuf.AsWriteableStream().WriteBytes(bytes);

docs/CONFIGURATION.md

@@ -55,3 +55,5 @@ uniffi-bindgen-cs path/to/definitions.udl --config path/to/uniffi.toml
     ```
 
 - `access_modifier` - override the default `internal` access modifier for "exported" uniffi symbols.
+
+- `null_string_to_empty` - when set to `true`, `null` strings will be converted to empty strings even if they are not optional.