add httpUserAgent option, add customized user-agent support to C#

modules/swagger-codegen/src/main/java/io/swagger/codegen/CodegenConfig.java

@@ -184,4 +184,8 @@ public interface CodegenConfig {
 
     String getReleaseVersion();
 
+    void setHttpUserAgent(String httpUserAgent);
+
+    String getHttpUserAgent();
+
 }

modules/swagger-codegen/src/main/java/io/swagger/codegen/CodegenConstants.java

@@ -103,4 +103,7 @@ public class CodegenConstants {
     public static final String RELEASE_VERSION = "releaseVersion";
     public static final String RELEASE_VERSION_DESC= "Release version, e.g. 1.2.5, default to 0.1.0.";
 
+    public static final String HTTP_USER_AGENT = "httpUserAgent";
+    public static final String HTTP_USER_AGENT_DESC = "HTTP user agent, e.g. codegen_csharp_api_client, default to 'Swagger-Codegen/{releaseVersion}}/{language}'";
+
 }

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -84,6 +84,7 @@ public class DefaultCodegen {
     protected Boolean sortParamsByRequiredFlag = true;
     protected Boolean ensureUniqueParams = true;
     protected String gitUserId, gitRepoId, releaseNote, releaseVersion;
+    protected String httpUserAgent;
 
     public List<CliOption> cliOptions() {
         return cliOptions;
@@ -2431,6 +2432,24 @@ public class DefaultCodegen {
         return releaseVersion;
     }
 
+    /**
+     * Set HTTP user agent.
+     *
+     * @param httpUserAgent HTTP user agent
+     */
+    public void setHttpUserAgent(String httpUserAgent) {
+        this.httpUserAgent = httpUserAgent;
+    }
+
+    /**
+     * HTTP user agent 
+     *
+     * @return HTTP user agent
+     */
+    public String getHttpUserAgent() {
+        return httpUserAgent;
+    }
+
     @SuppressWarnings("static-method")
     protected CliOption buildLibraryCliOption(Map<String, String> supportedLibraries) {
         StringBuilder sb = new StringBuilder("library template (sub-template) to use:");

modules/swagger-codegen/src/main/java/io/swagger/codegen/config/CodegenConfigurator.java

@@ -64,6 +64,7 @@ public class CodegenConfigurator {
     private String gitRepoId="YOUR_GIT_REPO_ID";
     private String releaseNote="Minor update";
     private String releaseVersion="0.1.0";
+    private String httpUserAgent;
 
     private final Map<String, String> dynamicProperties = new HashMap<String, String>(); //the map that holds the JsonAnySetter/JsonAnyGetter values
 
@@ -334,6 +335,15 @@ public class CodegenConfigurator {
         this.releaseVersion = releaseVersion;
         return this;
     }
+    
+    public String getHttpUserAgent() {
+        return httpUserAgent;
+    }
+
+    public CodegenConfigurator setHttpUserAgent(String httpUserAgent) {
+        this.httpUserAgent= httpUserAgent;
+        return this;
+    }
 
     public ClientOptInput toClientOptInput() {
 
@@ -366,6 +376,7 @@ public class CodegenConfigurator {
         checkAndSetAdditionalProperty(gitRepoId, CodegenConstants.GIT_REPO_ID);
         checkAndSetAdditionalProperty(releaseVersion, CodegenConstants.RELEASE_VERSION);
         checkAndSetAdditionalProperty(releaseNote, CodegenConstants.RELEASE_NOTE);
+        checkAndSetAdditionalProperty(httpUserAgent, CodegenConstants.HTTP_USER_AGENT);
 
         handleDynamicProperties(config);
 

modules/swagger-codegen/src/main/resources/csharp/ApiClient.mustache

@@ -84,6 +84,9 @@ namespace {{packageName}}.Client
             String contentType)
         {
             var request = new RestRequest(path, method);
+
+            // add user agent header
+            request.AddHeader("User-Agent", Configuration.HttpUserAgent);
    
             // add path parameter, if any
             foreach(var param in pathParams)

modules/swagger-codegen/src/main/resources/csharp/Configuration.mustache

@@ -34,7 +34,8 @@ namespace {{packageName}}.Client
                              Dictionary<String, String> apiKeyPrefix = null,
                              string tempFolderPath = null,
                              string dateTimeFormat = null,
-                             int timeout = 100000
+                             int timeout = 100000,
+                             string httpUserAgent = "{{#httpUserAgent}}{{.}}{{/httpUserAgent}}{{^httpUserAgent}}Swagger-Codegen/{{packageVersion}}/csharp{{/httpUserAgent}}"
                             )
         {
             setApiClientUsingDefault(apiClient);
@@ -42,6 +43,7 @@ namespace {{packageName}}.Client
             Username = username;
             Password = password;
             AccessToken = accessToken;
+            HttpUserAgent = httpUserAgent;
 
             if (defaultHeader != null)
                 DefaultHeader = defaultHeader;
@@ -146,6 +148,12 @@ namespace {{packageName}}.Client
             _defaultHeaderMap.Add(key, value);
         }
 
+        /// <summary>
+        /// Gets or sets the HTTP user agent.
+        /// </summary>
+        /// <value>Http user agent.</value>
+        public String HttpUserAgent { get; set; }
+
         /// <summary>
         /// Gets or sets the username (HTTP basic authentication).
         /// </summary>

modules/swagger-codegen/src/main/resources/csharp/api.mustache

@@ -82,6 +82,12 @@ namespace {{packageName}}.Api
         public {{classname}}(String basePath)
         {
             this.Configuration = new Configuration(new ApiClient(basePath));
+
+            // ensure API client has configuration ready
+            if (Configuration.ApiClient.Configuration == null)
+            {
+                this.Configuration.ApiClient.Configuration = this.Configuration;
+            }
         }
     
         /// <summary>
@@ -96,6 +102,12 @@ namespace {{packageName}}.Api
                 this.Configuration = Configuration.Default; 
             else
                 this.Configuration = configuration;
+
+            // ensure API client has configuration ready
+            if (Configuration.ApiClient.Configuration == null)
+            {
+                this.Configuration.ApiClient.Configuration = this.Configuration;
+            }
         }
 
         /// <summary>