[Rust Server] Handle arrays in forms (#19625)

* [Rust Server] Handle arrays in forms correctly

* [Rust Server] Add tests

* Update samples

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java

@@ -1520,6 +1520,10 @@ private void processParam(CodegenParameter param, CodegenOperation op) {
         if (Boolean.TRUE.equals(param.isFreeFormObject)) {
             param.vendorExtensions.put("x-format-string", "{:?}");
             example = null;
+        } else if (param.isArray && param.isString) {
+            // This occurs if the parameter is a form property and is Vec<String>
+            param.vendorExtensions.put("x-format-string", "{:?}");
+            example = (param.example != null) ? "&vec![\"" + param.example + "\".to_string()]" : "&Vec::new()";
         } else if (param.isString) {
             param.vendorExtensions.put("x-format-string", "\\\"{}\\\"");
             example = "\"" + ((param.example != null) ? param.example : "") + "\".to_string()";

modules/openapi-generator/src/main/resources/rust-server/client-request-body-instance.mustache

@@ -28,11 +28,36 @@
         // Consumes form body
     {{#formParams}}
       {{#-first}}
-        let params = &[
+        let mut params = vec![];
       {{/-first}}
-            ("{{{baseName}}}", {{#vendorExtensions}}{{#required}}Some({{#isString}}param_{{{paramName}}}{{/isString}}{{^isString}}format!("{:?}", param_{{{paramName}}}){{/isString}}){{/required}}{{^required}}{{#isString}}param_{{{paramName}}}{{/isString}}{{^isString}}param_{{{paramName}}}.map(|param| format!("{:?}", param)){{/isString}}{{/required}}{{/vendorExtensions}}),
+      {{^required}}
+        if let Some(param_{{{paramName}}}) = param_{{{paramName}}} {
+      {{/required}}
+      {{#isArray}}
+        // style=form,explode=true
+        for param_{{{paramName}}} in param_{{{paramName}}} {
+      {{/isArray}}
+        params.push(("{{{baseName}}}",
+      {{^isString}}
+            format!("{{{vendorExtensions.x-format-string}}}", param_{{{paramName}}})
+      {{/isString}}
+      {{#isString}}
+        {{#isArray}}
+            param_{{{paramName}}}.to_string()
+        {{/isArray}}
+        {{^isArray}}
+            param_{{{paramName}}}
+        {{/isArray}}
+      {{/isString}}
+        ));
+      {{#isArray}}
+        }
+      {{/isArray}}
+      {{^required}}
+        }
+      {{/required}}
       {{#-last}}
-        ];
+
         let body = serde_urlencoded::to_string(params).expect("impossible to fail to serialize");
 
         *request.body_mut() = Body::from(body.into_bytes());

modules/openapi-generator/src/test/resources/3_0/rust-server/openapi-v3.yaml

@@ -495,6 +495,24 @@ paths:
       responses:
         200:
           description: OK
+  /form-test:
+    post:
+      summary: Test a Form Post
+      operationId: FormTest
+      requestBody:
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              properties:
+                requiredArray:
+                  type: array
+                  items:
+                    type: string
+        required: true
+      responses:
+        '200':
+          description: OK
 
 components:
   securitySchemes:

samples/server/petstore/rust-server/output/openapi-v3/Cargo.toml

@@ -10,6 +10,7 @@ edition = "2018"
 [features]
 default = ["client", "server"]
 client = [
+    "serde_urlencoded",
     "serde_ignored", "regex", "percent-encoding", "lazy_static",
     "hyper", "hyper-openssl", "hyper-tls", "native-tls", "openssl", "url"
 ]
@@ -55,6 +56,7 @@ serde_ignored = {version = "0.1.1", optional = true}
 url = {version = "2.1", optional = true}
 
 # Client-specific
+serde_urlencoded = {version = "0.6.1", optional = true}
 
 # Server, and client callback-specific
 lazy_static = { version = "1.4", optional = true }

samples/server/petstore/rust-server/output/openapi-v3/README.md

@@ -89,6 +89,7 @@ To run a client, follow one of the following simple steps:
 cargo run --example client AnyOfGet
 cargo run --example client CallbackWithHeaderPost
 cargo run --example client ComplexQueryParamGet
+cargo run --example client FormTest
 cargo run --example client GetWithBooleanParameter
 cargo run --example client JsonComplexQueryParamGet
 cargo run --example client MandatoryRequestHeaderGet
@@ -152,6 +153,7 @@ Method | HTTP request | Description
 [****](docs/default_api.md#) | **GET** /any-of | 
 [****](docs/default_api.md#) | **POST** /callback-with-header | 
 [****](docs/default_api.md#) | **GET** /complex-query-param | 
+[**FormTest**](docs/default_api.md#FormTest) | **POST** /form-test | Test a Form Post
 [**GetWithBooleanParameter**](docs/default_api.md#GetWithBooleanParameter) | **GET** /get-with-bool | 
 [****](docs/default_api.md#) | **GET** /json-complex-query-param | 
 [****](docs/default_api.md#) | **GET** /mandatory-request-header | 

samples/server/petstore/rust-server/output/openapi-v3/api/openapi.yaml

@@ -525,6 +525,19 @@ paths:
       responses:
         "200":
           description: OK
+  /form-test:
+    post:
+      operationId: FormTest
+      requestBody:
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: '#/components/schemas/FormTest_request'
+        required: true
+      responses:
+        "200":
+          description: OK
+      summary: Test a Form Post
 components:
   schemas:
     AnyOfProperty:
@@ -780,6 +793,13 @@ components:
       anyOf:
       - $ref: '#/components/schemas/StringObject'
       - $ref: '#/components/schemas/UuidObject'
+    FormTest_request:
+      properties:
+        requiredArray:
+          items:
+            type: string
+          type: array
+      type: object
     AnyOfObject_anyOf:
       enum:
       - FOO

samples/server/petstore/rust-server/output/openapi-v3/bin/cli.rs

@@ -8,6 +8,7 @@ use openapi_v3::{
     AnyOfGetResponse,
     CallbackWithHeaderPostResponse,
     ComplexQueryParamGetResponse,
+    FormTestResponse,
     GetWithBooleanParameterResponse,
     JsonComplexQueryParamGetResponse,
     MandatoryRequestHeaderGetResponse,
@@ -101,6 +102,11 @@ enum Operation {
         #[structopt(parse(try_from_str = parse_json), long)]
         list_of_strings: Option<Vec<models::StringObject>>,
     },
+    /// Test a Form Post
+    FormTest {
+        #[structopt(parse(try_from_str = parse_json), long)]
+        required_array: Option<Vec<String>>,
+    },
     GetWithBooleanParameter {
         /// Let's check apostrophes get encoded properly!
         #[structopt(short, long)]
@@ -319,6 +325,22 @@ async fn main() -> Result<()> {
                     ,
             }
         }
+        Operation::FormTest {
+            required_array,
+        } => {
+            info!("Performing a FormTest request");
+
+            let result = client.form_test(
+                required_array.as_ref(),
+            ).await?;
+            debug!("Result: {:?}", result);
+
+            match result {
+                FormTestResponse::OK
+                => "OK\n".to_string()
+                    ,
+            }
+        }
         Operation::GetWithBooleanParameter {
             iambool,
         } => {

samples/server/petstore/rust-server/output/openapi-v3/docs/default_api.md

@@ -7,6 +7,7 @@ Method | HTTP request | Description
 ****](default_api.md#) | **GET** /any-of | 
 ****](default_api.md#) | **POST** /callback-with-header | 
 ****](default_api.md#) | **GET** /complex-query-param | 
+**FormTest**](default_api.md#FormTest) | **POST** /form-test | Test a Form Post
 **GetWithBooleanParameter**](default_api.md#GetWithBooleanParameter) | **GET** /get-with-bool | 
 ****](default_api.md#) | **GET** /json-complex-query-param | 
 ****](default_api.md#) | **GET** /mandatory-request-header | 
@@ -122,6 +123,38 @@ No authorization required
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
+# **FormTest**
+> FormTest(optional)
+Test a Form Post
+
+### Required Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **optional** | **map[string]interface{}** | optional parameters | nil if no parameters
+
+### Optional Parameters
+Optional parameters are passed through a map[string]interface{}.
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **required_array** | [**String**](String.md)|  | 
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/x-www-form-urlencoded
+ - **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
 # **GetWithBooleanParameter**
 > GetWithBooleanParameter(iambool)
 

samples/server/petstore/rust-server/output/openapi-v3/examples/client/main.rs

@@ -9,6 +9,7 @@ use openapi_v3::{Api, ApiNoContext, Claims, Client, ContextWrapperExt, models,
                       AnyOfGetResponse,
                       CallbackWithHeaderPostResponse,
                       ComplexQueryParamGetResponse,
+                      FormTestResponse,
                       GetWithBooleanParameterResponse,
                       JsonComplexQueryParamGetResponse,
                       MandatoryRequestHeaderGetResponse,
@@ -66,6 +67,7 @@ fn main() {
                 "AnyOfGet",
                 "CallbackWithHeaderPost",
                 "ComplexQueryParamGet",
+                "FormTest",
                 "GetWithBooleanParameter",
                 "JsonComplexQueryParamGet",
                 "MandatoryRequestHeaderGet",
@@ -185,6 +187,12 @@ fn main() {
             ));
             info!("{:?} (X-Span-ID: {:?})", result, (client.context() as &dyn Has<XSpanIdString>).get().clone());
         },
+        Some("FormTest") => {
+            let result = rt.block_on(client.form_test(
+                  Some(&Vec::new())
+            ));
+            info!("{:?} (X-Span-ID: {:?})", result, (client.context() as &dyn Has<XSpanIdString>).get().clone());
+        },
         Some("GetWithBooleanParameter") => {
             let result = rt.block_on(client.get_with_boolean_parameter(
                   true

samples/server/petstore/rust-server/output/openapi-v3/examples/server/server.rs

@@ -105,6 +105,7 @@ use openapi_v3::{
     AnyOfGetResponse,
     CallbackWithHeaderPostResponse,
     ComplexQueryParamGetResponse,
+    FormTestResponse,
     GetWithBooleanParameterResponse,
     JsonComplexQueryParamGetResponse,
     MandatoryRequestHeaderGetResponse,
@@ -166,6 +167,16 @@ impl<C> Api<C> for Server<C> where C: Has<XSpanIdString> + Send + Sync
         Err(ApiError("Api-Error: Operation is NOT implemented".into()))
     }
 
+    /// Test a Form Post
+    async fn form_test(
+        &self,
+        required_array: Option<&Vec<String>>,
+        context: &C) -> Result<FormTestResponse, ApiError>
+    {
+        info!("form_test({:?}) - X-Span-ID: {:?}", required_array, context.get().0.clone());
+        Err(ApiError("Api-Error: Operation is NOT implemented".into()))
+    }
+
     async fn get_with_boolean_parameter(
         &self,
         iambool: bool,

samples/server/petstore/rust-server/output/openapi-v3/src/client/mod.rs

@@ -39,6 +39,7 @@ use crate::{Api,
      AnyOfGetResponse,
      CallbackWithHeaderPostResponse,
      ComplexQueryParamGetResponse,
+     FormTestResponse,
      GetWithBooleanParameterResponse,
      JsonComplexQueryParamGetResponse,
      MandatoryRequestHeaderGetResponse,
@@ -670,6 +671,96 @@ impl<S, C> Api<C> for Client<S, C> where
         }
     }
 
+    async fn form_test(
+        &self,
+        param_required_array: Option<&Vec<String>>,
+        context: &C) -> Result<FormTestResponse, ApiError>
+    {
+        let mut client_service = self.client_service.clone();
+        let mut uri = format!(
+            "{}/form-test",
+            self.base_path
+        );
+
+        // Query parameters
+        let query_string = {
+            let mut query_string = form_urlencoded::Serializer::new("".to_owned());
+            query_string.finish()
+        };
+        if !query_string.is_empty() {
+            uri += "?";
+            uri += &query_string;
+        }
+
+        let uri = match Uri::from_str(&uri) {
+            Ok(uri) => uri,
+            Err(err) => return Err(ApiError(format!("Unable to build URI: {}", err))),
+        };
+
+        let mut request = match Request::builder()
+            .method("POST")
+            .uri(uri)
+            .body(Body::empty()) {
+                Ok(req) => req,
+                Err(e) => return Err(ApiError(format!("Unable to create request: {}", e)))
+        };
+
+        // Consumes form body
+        let mut params = vec![];
+        if let Some(param_required_array) = param_required_array {
+        // style=form,explode=true
+        for param_required_array in param_required_array {
+        params.push(("requiredArray",
+            format!("{:?}", param_required_array)
+        ));
+        }
+        }
+
+        let body = serde_urlencoded::to_string(params).expect("impossible to fail to serialize");
+
+        *request.body_mut() = Body::from(body.into_bytes());
+
+        let header = "application/x-www-form-urlencoded";
+        request.headers_mut().insert(CONTENT_TYPE, match HeaderValue::from_str(header) {
+            Ok(h) => h,
+            Err(e) => return Err(ApiError(format!("Unable to create header: {} - {}", header, e)))
+        });
+
+        let header = HeaderValue::from_str(Has::<XSpanIdString>::get(context).0.as_str());
+        request.headers_mut().insert(HeaderName::from_static("x-span-id"), match header {
+            Ok(h) => h,
+            Err(e) => return Err(ApiError(format!("Unable to create X-Span ID header value: {}", e)))
+        });
+
+        let response = client_service.call((request, context.clone()))
+            .map_err(|e| ApiError(format!("No response received: {}", e))).await?;
+
+        match response.status().as_u16() {
+            200 => {
+                Ok(
+                    FormTestResponse::OK
+                )
+            }
+            code => {
+                let headers = response.headers().clone();
+                let body = response.into_body()
+                       .take(100)
+                       .into_raw().await;
+                Err(ApiError(format!("Unexpected response code {}:\n{:?}\n\n{}",
+                    code,
+                    headers,
+                    match body {
+                        Ok(body) => match String::from_utf8(body) {
+                            Ok(body) => body,
+                            Err(e) => format!("<Body was not UTF8: {:?}>", e),
+                        },
+                        Err(e) => format!("<Failed to read body: {}>", e),
+                    }
+                )))
+            }
+        }
+    }
+
     async fn get_with_boolean_parameter(
         &self,
         param_iambool: bool,