feat(Rust): Add support for multipart file uploads in reqwest generators

Author: Elric Milon

modules/openapi-generator/src/main/resources/rust/Cargo.mustache

@@ -97,7 +97,7 @@ rustls-tls = ["reqwest/rustls-tls"]
 {{/reqwest}}
 {{#reqwestTrait}}
 async-trait = "^0.1"
-reqwest = { version = "^0.12", default-features = false, features = ["json", "multipart"] }
+reqwest = { version = "^0.12", default-features = false, features = ["json", "multipart", "stream"] }
 {{#supportMiddleware}}
 reqwest-middleware = { version = "^0.4", features = ["json", "multipart"] }
 {{/supportMiddleware}}

modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache

@@ -391,7 +391,14 @@ impl {{classname}} for {{classname}}Client {
         let mut local_var_form = reqwest::multipart::Form::new();
         {{#formParams}}
         {{#isFile}}
-        // TODO: support file upload for '{{{baseName}}}' parameter
+        {{^isRequired}}
+        if let Some(ref path) = {{{baseName}}} {
+            local_var_form = local_var_form.file("{{{baseName}}}", path.as_os_str()).await?;
+        }
+        {{/isRequired}}
+        {{#isRequired}}
+            local_var_form = local_var_form.file("{{{baseName}}}", {{{baseName}}}.as_os_str()).await?;
+        {{/isRequired}}
         {{/isFile}}
         {{^isFile}}
         {{#required}}

modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache

@@ -397,13 +397,20 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{/isNullable}}
     {{/required}}
     {{^required}}
-    if let Some(param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
+    if let Some(ref param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
         multipart_form = multipart_form.file("{{{baseName}}}", param_value)?;
     }
     {{/required}}
     {{/supportAsync}}
     {{#supportAsync}}
-    // TODO: support file upload for '{{{baseName}}}' parameter
+    {{^required}}
+    if let Some(ref param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
+       multipart_form = multipart_form.file("{{{baseName}}}", param_value.as_os_str()).await?;
+    }
+    {{/required}}
+    {{#required}}
+    multipart_form = multipart_form.file("{{{baseName}}}", {{{vendorExtensions.x-rust-param-identifier}}}.as_os_str()).await?;
+    {{/required}}
     {{/supportAsync}}
     {{/isFile}}
     {{^isFile}}
@@ -420,7 +427,12 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{/required}}
     {{^required}}
     if let Some(param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
-        multipart_form = multipart_form.text("{{{baseName}}}", param_value{{#isArray}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(","){{/isArray}}.to_string());
+    {{#isPrimitiveType}}
+        multipart_form = multipart_form.text("{{{baseName}}}", param_value.to_string());
+    {{/isPrimitiveType}}
+    {{^isPrimitiveType}}
+        multipart_form = multipart_form.text("{{{baseName}}}", serde_json::to_string(&param_value)?);
+    {{/isPrimitiveType}}
     }
     {{/required}}
     {{/isFile}}