Fix a few issues with the C generator (part 2) (OpenAPITools#20227)

* [C] Don't convert post body strings to JSON

If the body provided for the api request is a just a string itself,
don't try to convert it to JSON, simply submit the string.

* [C] Implement BearerToken authentication

* [C] Handle nullable fields correctly

* [C] Fix implementation of FromString for enums

* [C] Update the test schemas to cover the changes

* Update samples

* Fix the updated samples

* [C] Add the new samples folder to the CI workflow

Author: eafer

.github/workflows/samples-c-libcurl-client.yaml

@@ -5,10 +5,12 @@ on:
     paths:
       - 'samples/client/petstore/c/**'
       - 'samples/client/petstore/c-useJsonUnformatted/**'
+      - 'samples/client/others/c/bearerAuth/**'
   pull_request:
     paths:
       - 'samples/client/petstore/c/**'
       - 'samples/client/petstore/c-useJsonUnformatted/**'
+      - 'samples/client/others/c/bearerAuth/**'
 
 jobs:
   build:
@@ -20,6 +22,7 @@ jobs:
         sample:
           - 'samples/client/petstore/c/'
           - 'samples/client/petstore/c-useJsonUnformatted/'
+          - 'samples/client/others/c/bearerAuth/'
 
     steps:
       - uses: actions/checkout@v4

bin/configs/c-bearer-auth.yaml

@@ -0,0 +1,4 @@
+generatorName: c
+outputDir: samples/client/others/c/bearerAuth
+inputSpec: modules/openapi-generator/src/test/resources/3_0/c/bearer_auth.yaml
+templateDir: modules/openapi-generator/src/main/resources/C-libcurl

modules/openapi-generator/src/main/resources/C-libcurl/api-body.mustache

@@ -324,13 +324,18 @@ end:
     }
     {{/isArray}}
     {{^isArray}}
+    {{#isString}}
+    localVarBodyParameters = strdup({{paramName}});
+    {{/isString}}
+    {{^isString}}
     cJSON *localVarSingleItemJSON_{{paramName}} = NULL;
     if ({{paramName}} != NULL)
     {
         //string
         localVarSingleItemJSON_{{paramName}} = {{dataType}}_convertToJSON({{paramName}});
         localVarBodyParameters = {{{cJSONPrint}}}(localVarSingleItemJSON_{{paramName}});
     }
+    {{/isString}}
     {{/isArray}}
     {{/bodyParam}}
     {{#produces}}
@@ -458,10 +463,12 @@ end:
     free(localVarBodyParameters);
     {{/isArray}}
     {{^isArray}}
+    {{^isString}}
     if (localVarSingleItemJSON_{{paramName}}) {
         cJSON_Delete(localVarSingleItemJSON_{{paramName}});
         localVarSingleItemJSON_{{paramName}} = NULL;
     }
+    {{/isString}}
     free(localVarBodyParameters);
     {{/isArray}}
     {{/bodyParams}}

modules/openapi-generator/src/main/resources/C-libcurl/apiClient.c.mustache

@@ -22,6 +22,9 @@ apiClient_t *apiClient_create() {
     apiClient->username = NULL;
     apiClient->password = NULL;
     {{/isBasicBasic}}
+    {{#isBasicBearer}}
+    apiClient->accessToken = NULL;
+    {{/isBasicBearer}}
     {{#isOAuth}}
     apiClient->accessToken = NULL;
     {{/isOAuth}}
@@ -69,6 +72,9 @@ apiClient_t *apiClient_create_with_base_path(const char *basePath
     apiClient->username = NULL;
     apiClient->password = NULL;
     {{/isBasicBasic}}
+    {{#isBasicBearer}}
+    apiClient->accessToken = NULL;
+    {{/isBasicBearer}}
     {{#isOAuth}}
     apiClient->accessToken = NULL;
     {{/isOAuth}}
@@ -108,6 +114,11 @@ void apiClient_free(apiClient_t *apiClient) {
         free(apiClient->password);
     }
     {{/isBasicBasic}}
+    {{#isBasicBearer}}
+    if(apiClient->accessToken) {
+        free(apiClient->accessToken);
+    }
+    {{/isBasicBearer}}
     {{#isOAuth}}
     if(apiClient->accessToken) {
         free(apiClient->accessToken);
@@ -467,6 +478,20 @@ void apiClient_invoke(apiClient_t    *apiClient,
         }
         }
         {{/isApiKey}}
+        {{#isBasicBearer}}
+        // this would only be generated for bearer token authentication
+        if(apiClient->accessToken != NULL)
+        {
+            int authHeaderSize;
+            char *authHeader = NULL;
+
+            authHeaderSize = snprintf(NULL, 0, "Authorization: Bearer %s", apiClient->accessToken) + 1;
+            authHeader = malloc(authHeaderSize);
+            snprintf(authHeader, authHeaderSize, "Authorization: Bearer %s", apiClient->accessToken);
+            headers = curl_slist_append(headers, authHeader);
+            free(authHeader);
+        }
+        {{/isBasicBearer}}
         {{/authMethods}}
         {{/hasAuthMethods}}
 

modules/openapi-generator/src/main/resources/C-libcurl/apiClient.h.mustache

@@ -34,6 +34,9 @@ typedef struct apiClient_t {
     char *username;
     char *password;
     {{/isBasicBasic}}
+    {{#isBasicBearer}}
+    char *accessToken;
+    {{/isBasicBearer}}
     {{#isOAuth}}
     char *accessToken;
     {{/isOAuth}}

modules/openapi-generator/src/main/resources/C-libcurl/model-body.mustache

@@ -49,27 +49,20 @@ fail:
 }
 
 {{projectName}}_{{classVarName}}_{{enumName}}_e {{classname}}_parseFromJSON(cJSON *{{classname}}JSON) {
-    {{projectName}}_{{classVarName}}_{{enumName}}_e *{{classname}} = NULL;
 {{#isEnum}}
 {{#isNumeric}}
-    cJSON *{{{classname}}}Var = cJSON_GetObjectItemCaseSensitive({{classname}}JSON, "{{{classname}}}");
-    if(!cJSON_IsNumber({{{classname}}}Var))
-    {
-        goto end;
+    if(!cJSON_IsNumber({{{classname}}}JSON)) {
+        return 0;
     }
+    return {{classname}}JSON->valueint;
 {{/isNumeric}}
 {{#isString}}
-    {{projectName}}_{{classVarName}}_{{enumName}}_e {{classname}}Variable;
-    cJSON *{{{classname}}}Var = cJSON_GetObjectItemCaseSensitive({{classname}}JSON, "{{{classname}}}");
-    if(!cJSON_IsString({{{classname}}}Var) || ({{{classname}}}Var->valuestring == NULL)){
-        goto end;
+    if(!cJSON_IsString({{{classname}}}JSON) || ({{{classname}}}JSON->valuestring == NULL)) {
+        return 0;
     }
-    {{classname}}Variable = {{classFilename}}_{{classname}}_FromString({{{classname}}}Var->valuestring);
+    return {{classFilename}}_{{classname}}_FromString({{{classname}}}JSON->valuestring);
 {{/isString}}
 {{/isEnum}}
-    return {{classname}}Variable;
-end:
-    return 0;
 }
 {{/isEnum}}
 {{^isEnum}}
@@ -623,6 +616,9 @@ fail:
     {{#vars}}
     // {{{classname}}}->{{{name}}}
     cJSON *{{{name}}} = cJSON_GetObjectItemCaseSensitive({{classname}}JSON, "{{{baseName}}}");
+    if (cJSON_IsNull({{{name}}})) {
+        {{{name}}} = NULL;
+    }
     {{#required}}
     if (!{{{name}}}) {
         goto end;

modules/openapi-generator/src/test/resources/2_0/c/petstore.yaml

@@ -253,6 +253,26 @@ paths:
         - petstore_auth:
             - 'write:pets'
             - 'read:pets'
+  /pet/picture:
+    post:
+      tags:
+        - pet
+      summary: Send a picture of your happy pet
+      description: ''
+      operationId: sharePicture
+      parameters:
+        - in: body
+          name: picture
+          description: A picture you want to share
+          required: true
+          schema:
+            type: string
+      responses:
+        '200':
+          description: successful operation
+          schema:
+            type: string
+            description: Thank you message
   '/pet/{petId}/uploadImage':
     post:
       tags:
@@ -290,6 +310,31 @@ paths:
         - petstore_auth:
             - 'write:pets'
             - 'read:pets'
+  '/pet/{petId}/isAvailable':
+    post:
+      tags:
+        - pet
+      summary: Is this pet still available?
+      description: ''
+      operationId: isPetAvailable
+      produces:
+        - application/json
+      parameters:
+        - name: petId
+          in: path
+          description: ID of pet to check
+          required: true
+          type: integer
+          format: int64
+      responses:
+        '200':
+          description: successful operation
+          schema:
+            $ref: '#/definitions/Bit'
+      security:
+        - petstore_auth:
+            - 'write:pets'
+            - 'read:pets'
   /store/inventory:
     get:
       tags:
@@ -775,3 +820,9 @@ definitions:
         uniqueItems: true
         items:
           type: string
+  Bit:
+    description: bit value
+    type: number
+    enum:
+      - 0
+      - 1

modules/openapi-generator/src/test/resources/3_0/c/bearer_auth.yaml

@@ -0,0 +1,58 @@
+# Copied from k6
+openapi: 3.0.0
+info:
+  title: Sample API
+  description: Optional multiline or single-line description in [CommonMark](http://commonmark.org/help/) or HTML.
+  version: 0.1.9
+servers:
+  - url: http://api.example.com/v1
+    description: Optional server description, e.g. Main (production) server
+  - url: http://staging-api.example.com
+    description: Optional server description, e.g. Internal staging server for testing
+security:
+  - bearerAuth: []
+paths:
+  /users:
+    get:
+      summary: Returns a list of users.
+      description: Optional extended description in CommonMark or HTML.
+      responses:
+        "200": # status code
+          description: A JSON array of user names
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  type: string
+      security:
+        - bearerAuth: []
+  /public:
+    get:
+      summary: Returns public information.
+      description: This endpoint does not require authentication.
+      responses:
+        "200":
+          description: A JSON object with public information
+          content:
+            application/json:
+              schema:
+                type: object
+      security: []
+  /private:
+    get:
+      summary: Returns private information.
+      description: This endpoint requires global security settings.
+      responses:
+        "200":
+          description: A JSON object with private information
+          content:
+            application/json:
+              schema:
+                type: object
+components:
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT # Optional: specify the format (e.g., JWT) if applicable

samples/client/others/c/bearerAuth/.openapi-generator-ignore

@@ -0,0 +1,23 @@
+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/client/others/c/bearerAuth/.openapi-generator/FILES

@@ -0,0 +1,22 @@
+CMakeLists.txt
+Packing.cmake
+README.md
+api/DefaultAPI.c
+api/DefaultAPI.h
+docs/DefaultAPI.md
+external/cJSON.c
+external/cJSON.h
+external/cJSON.licence
+include/apiClient.h
+include/binary.h
+include/keyValuePair.h
+include/list.h
+libcurl.licence
+model/any_type.h
+model/object.c
+model/object.h
+src/apiClient.c
+src/apiKey.c
+src/binary.c
+src/list.c
+uncrustify-rules.cfg

samples/client/others/c/bearerAuth/.openapi-generator/VERSION

@@ -0,0 +1 @@
+7.11.0-SNAPSHOT