[Java][apache-httpclient][feign][okhttp-gson] Enable access token refresh

modules/openapi-generator/src/main/resources/Java/auth/HttpBearerAuth.mustache

@@ -4,13 +4,15 @@ package {{invokerPackage}}.auth;
 
 import {{invokerPackage}}.Pair;
 
-import java.util.Map;
 import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Supplier;
 
 {{>generatedAnnotation}}
 public class HttpBearerAuth implements Authentication {
   private final String scheme;
-  private String bearerToken;
+  private Supplier<String> tokenSupplier;
 
   public HttpBearerAuth(String scheme) {
     this.scheme = scheme;
@@ -22,7 +24,7 @@ public class HttpBearerAuth implements Authentication {
    * @return The bearer token
    */
   public String getBearerToken() {
-    return bearerToken;
+    return tokenSupplier.get();
   }
 
   /**
@@ -31,12 +33,22 @@ public class HttpBearerAuth implements Authentication {
    * @param bearerToken The bearer token to send in the Authorization header
    */
   public void setBearerToken(String bearerToken) {
-    this.bearerToken = bearerToken;
+    this.tokenSupplier = () -> bearerToken;
+  }
+
+  /**
+   * Sets the supplier of tokens, which together with the scheme, will be sent as the value of the Authorization header.
+   *
+   * @param tokenSupplier The supplier of bearer tokens to send in the Authorization header
+   */
+  public void setBearerToken(Supplier<String> tokenSupplier) {
+    this.tokenSupplier = tokenSupplier;
   }
 
   @Override
   public void applyToParams(List<Pair> queryParams, Map<String, String> headerParams, Map<String, String> cookieParams) {
-    if(bearerToken == null) {
+    String bearerToken = Optional.ofNullable(tokenSupplier).map(Supplier::get).orElse(null);
+    if (bearerToken == null) {
       return;
     }
 

modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/ApiClient.mustache

@@ -49,6 +49,7 @@ import java.util.List;
 import java.util.Arrays;
 import java.util.ArrayList;
 import java.util.Date;
+import java.util.function.Supplier;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -335,6 +336,20 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
     throw new RuntimeException("No Bearer authentication configured!");
   }
 
+  /**
+   * Helper method to set the supplier of access tokens for Bearer authentication.
+   *
+   * @param tokenSupplier the token supplier function
+   */
+  public void setBearerToken(Supplier<String> tokenSupplier) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof HttpBearerAuth) {
+        ((HttpBearerAuth) auth).setBearerToken(tokenSupplier);
+        return;
+      }
+    }
+    throw new RuntimeException("No Bearer authentication configured!");
+  }
   {{/hasHttpBearerMethods}}
 
   {{#hasHttpBasicMethods}}

modules/openapi-generator/src/main/resources/Java/libraries/feign/ApiClient.mustache

@@ -2,6 +2,7 @@ package {{invokerPackage}};
 
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.function.Supplier;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -265,6 +266,15 @@ public class ApiClient {
     apiAuthorization.setBearerToken(bearerToken);
   }
 
+  /**
+   * Helper method to configure the supplier of bearer tokens.
+   * @param tokenSupplier the supplier of bearer tokens.
+   */
+  public void setBearerToken(Supplier<String> tokenSupplier) {
+    HttpBearerAuth apiAuthorization =  getAuthorization(HttpBearerAuth.class);
+    apiAuthorization.setBearerToken(tokenSupplier);
+  }
+
   /**
    * Helper method to configure the first api key found
    * @param apiKey API key

modules/openapi-generator/src/main/resources/Java/libraries/feign/auth/HttpBearerAuth.mustache

@@ -2,35 +2,51 @@ package {{invokerPackage}}.auth;
 
 import feign.RequestInterceptor;
 import feign.RequestTemplate;
+import java.util.Optional;
+import java.util.function.Supplier;
 
 /**
  * An interceptor that adds the request header needed to use HTTP bearer authentication.
  */
 public class HttpBearerAuth implements RequestInterceptor {
   private final String scheme;
-  private String bearerToken;
+  private Supplier<String> tokenSupplier;
 
   public HttpBearerAuth(String scheme) {
     this.scheme = scheme;
   }
 
   /**
    * Gets the token, which together with the scheme, will be sent as the value of the Authorization header.
+   *
+   * @return The bearer token
    */
   public String getBearerToken() {
-    return bearerToken;
+    return tokenSupplier.get();
   }
 
   /**
    * Sets the token, which together with the scheme, will be sent as the value of the Authorization header.
+   *
+   * @param bearerToken The bearer token to send in the Authorization header
    */
   public void setBearerToken(String bearerToken) {
-    this.bearerToken = bearerToken;
+    this.tokenSupplier = () -> bearerToken;
+  }
+
+  /**
+   * Sets the supplier of tokens, which together with the scheme, will be sent as the value of the Authorization header.
+   *
+   * @param tokenSupplier The supplier of bearer tokens to send in the Authorization header
+   */
+  public void setBearerToken(Supplier<String> tokenSupplier) {
+    this.tokenSupplier = tokenSupplier;
   }
 
   @Override
   public void apply(RequestTemplate template) {
-    if(bearerToken == null) {
+    String bearerToken = Optional.ofNullable(tokenSupplier).map(Supplier::get).orElse(null);
+    if (bearerToken == null) {
       return;
     }
 

modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache

@@ -53,6 +53,7 @@ import java.time.format.DateTimeFormatter;
 import java.util.*;
 import java.util.Map.Entry;
 import java.util.concurrent.TimeUnit;
+import java.util.function.Supplier;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -528,14 +529,23 @@ public class ApiClient {
     }
 
     {{#hasHttpBearerMethods}}
-        /**
-        * Helper method to set access token for the first Bearer authentication.
-        * @param bearerToken Bearer token
-        */
+    /**
+     * Helper method to set access token for the first Bearer authentication.
+     * @param bearerToken Bearer token
+     */
     public void setBearerToken(String bearerToken) {
+        setBearerToken(() -> bearerToken);
+    }
+
+    /**
+     * Helper method to set the supplier of access tokens for Bearer authentication.
+     *
+     * @param tokenSupplier The supplier of bearer tokens
+     */
+    public void setBearerToken(Supplier<String> tokenSupplier) {
         for (Authentication auth : authentications.values()) {
             if (auth instanceof HttpBearerAuth) {
-                ((HttpBearerAuth) auth).setBearerToken(bearerToken);
+                ((HttpBearerAuth) auth).setBearerToken(tokenSupplier);
                 return;
             }
         }

modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/auth/HttpBearerAuth.mustache

@@ -6,13 +6,15 @@ import {{invokerPackage}}.ApiException;
 import {{invokerPackage}}.Pair;
 
 import java.net.URI;
-import java.util.Map;
 import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Supplier;
 
 {{>generatedAnnotation}}
 public class HttpBearerAuth implements Authentication {
   private final String scheme;
-  private String bearerToken;
+  private Supplier<String> tokenSupplier;
 
   public HttpBearerAuth(String scheme) {
     this.scheme = scheme;
@@ -24,7 +26,7 @@ public class HttpBearerAuth implements Authentication {
    * @return The bearer token
    */
   public String getBearerToken() {
-    return bearerToken;
+    return tokenSupplier.get();
   }
 
   /**
@@ -33,12 +35,22 @@ public class HttpBearerAuth implements Authentication {
    * @param bearerToken The bearer token to send in the Authorization header
    */
   public void setBearerToken(String bearerToken) {
-    this.bearerToken = bearerToken;
+    this.tokenSupplier = () -> bearerToken;
+  }
+
+  /**
+   * Sets the supplier of tokens, which together with the scheme, will be sent as the value of the Authorization header.
+   *
+   * @param tokenSupplier The supplier of bearer tokens to send in the Authorization header
+   */
+  public void setBearerToken(Supplier<String> tokenSupplier) {
+    this.tokenSupplier = tokenSupplier;
   }
 
   @Override
   public void applyToParams(List<Pair> queryParams, Map<String, String> headerParams, Map<String, String> cookieParams,
                             String payload, String method, URI uri) throws ApiException {
+    String bearerToken = Optional.ofNullable(tokenSupplier).map(Supplier::get).orElse(null);
     if (bearerToken == null) {
       return;
     }

modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache

@@ -188,18 +188,18 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
 
     {{#hasHttpBearerMethods}}
     /**
-     * Helper method to set token for HTTP bearer authentication.
+     * Helper method to set access token for the first Bearer authentication.
      *
-     * @param bearerToken the token
+     * @param bearerToken Bearer token
      */
     public void setBearerToken(String bearerToken) {
         setBearerToken(() -> bearerToken);
     }
 
     /**
-     * Helper method to set the token supplier for HTTP bearer authentication.
+     * Helper method to set the supplier of access tokens for Bearer authentication.
      *
-     * @param tokenSupplier the token supplier function
+     * @param tokenSupplier The supplier of bearer tokens
      */
     public void setBearerToken(Supplier<String> tokenSupplier) {
         for (Authentication auth : authentications.values()) {

modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/auth/HttpBearerAuth.mustache

@@ -14,14 +14,29 @@ public class HttpBearerAuth implements Authentication {
         this.scheme = scheme;
     }
 
+    /**
+     * Gets the token, which together with the scheme, will be sent as the value of the Authorization header.
+     *
+     * @return The bearer token
+     */
     public String getBearerToken() {
         return tokenSupplier.get();
     }
 
+    /**
+     * Sets the token, which together with the scheme, will be sent as the value of the Authorization header.
+     *
+     * @param bearerToken The bearer token to send in the Authorization header
+     */
     public void setBearerToken(String bearerToken) {
         this.tokenSupplier = () -> bearerToken;
     }
-
+
+    /**
+     * Sets the supplier of tokens, which together with the scheme, will be sent as the value of the Authorization header.
+     *
+     * @param tokenSupplier The supplier of bearer tokens to send in the Authorization header
+     */
     public void setBearerToken(Supplier<String> tokenSupplier) {
         this.tokenSupplier = tokenSupplier;
     }

samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/ApiClient.java

@@ -55,6 +55,7 @@
 import java.util.Arrays;
 import java.util.ArrayList;
 import java.util.Date;
+import java.util.function.Supplier;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -305,6 +306,20 @@ public ApiClient setBearerToken(String bearerToken) {
     throw new RuntimeException("No Bearer authentication configured!");
   }
 
+  /**
+   * Helper method to set the supplier of access tokens for Bearer authentication.
+   *
+   * @param tokenSupplier the token supplier function
+   */
+  public void setBearerToken(Supplier<String> tokenSupplier) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof HttpBearerAuth) {
+        ((HttpBearerAuth) auth).setBearerToken(tokenSupplier);
+        return;
+      }
+    }
+    throw new RuntimeException("No Bearer authentication configured!");
+  }
 
   /**
    * Helper method to set username for the first HTTP basic authentication.

samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/auth/HttpBearerAuth.java

@@ -15,13 +15,15 @@
 
 import org.openapitools.client.Pair;
 
-import java.util.Map;
 import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Supplier;
 
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen")
 public class HttpBearerAuth implements Authentication {
   private final String scheme;
-  private String bearerToken;
+  private Supplier<String> tokenSupplier;
 
   public HttpBearerAuth(String scheme) {
     this.scheme = scheme;
@@ -33,7 +35,7 @@ public HttpBearerAuth(String scheme) {
    * @return The bearer token
    */
   public String getBearerToken() {
-    return bearerToken;
+    return tokenSupplier.get();
   }
 
   /**
@@ -42,12 +44,22 @@ public String getBearerToken() {
    * @param bearerToken The bearer token to send in the Authorization header
    */
   public void setBearerToken(String bearerToken) {
-    this.bearerToken = bearerToken;
+    this.tokenSupplier = () -> bearerToken;
+  }
+
+  /**
+   * Sets the supplier of tokens, which together with the scheme, will be sent as the value of the Authorization header.
+   *
+   * @param tokenSupplier The supplier of bearer tokens to send in the Authorization header
+   */
+  public void setBearerToken(Supplier<String> tokenSupplier) {
+    this.tokenSupplier = tokenSupplier;
   }
 
   @Override
   public void applyToParams(List<Pair> queryParams, Map<String, String> headerParams, Map<String, String> cookieParams) {
-    if(bearerToken == null) {
+    String bearerToken = Optional.ofNullable(tokenSupplier).map(Supplier::get).orElse(null);
+    if (bearerToken == null) {
       return;
     }