Dynamic oauth2RedirectUrl . Fixes #349

Author: bnasslahsen

Diff for: springdoc-openapi-common/src/main/java/org/springdoc/core/Constants.java

@@ -17,6 +17,8 @@ public final class Constants {
     public static final String SPRINGDOC_SWAGGER_UI_CONFIG_URL  ="springdoc.swagger-ui.configUrl";
     public static final String SPRINGDOC_SWAGGER_UI_URL  ="springdoc.swagger-ui.url";
     public static final String SPRINGDOC_SWAGGER_UI_URL_VALUE  ="${" + SPRINGDOC_SWAGGER_UI_URL + ":#{null}}";
+    public static final String SPRINGDOC_OAUTH2_REDIRECT_URL  ="springdoc.swagger-ui.oauth2RedirectUrl";
+    public static final String SPRINGDOC_OAUTH2_REDIRECT_URL_VALUE  ="${" + SPRINGDOC_OAUTH2_REDIRECT_URL + ":#{null}}";
     public static final String SPRINGDOC_SWAGGER_UI_CONFIG_URL_VALUE  ="${" + SPRINGDOC_SWAGGER_UI_CONFIG_URL + ":#{null}}";
     public static final String SPRINGDOC_SHOW_ACTUATOR = "springdoc.show-actuator";
     public static final String SPRINGDOC_SHOW_ACTUATOR_VALUE = "${" + SPRINGDOC_SHOW_ACTUATOR + ":false}";

Diff for: springdoc-openapi-ui/src/main/java/org/springdoc/ui/SwaggerWelcome.java

@@ -43,6 +43,9 @@ class SwaggerWelcome implements InitializingBean {
     @Value(SPRINGDOC_SWAGGER_UI_URL_VALUE)
     private String swaggerUiUrl;
 
+    @Value(SPRINGDOC_OAUTH2_REDIRECT_URL_VALUE)
+    private String oauth2RedirectUrl;
+
     @Autowired
     private SwaggerUiConfigProperties swaggerUiConfig;
 
@@ -95,7 +98,10 @@ private void buildConfigUrl(HttpServletRequest request) {
             } else
                 SwaggerUiConfigProperties.addUrl(url);
         }
-        if (!swaggerUiConfig.isValidUrl(swaggerUiConfig.getOauth2RedirectUrl())) {
+        if(StringUtils.isEmpty(oauth2RedirectUrl)){
+            swaggerUiConfig.setOauth2RedirectUrl(ServletUriComponentsBuilder.fromCurrentContextPath().path(this.uiRootPath).path(SWAGGER_UI_OAUTH_REDIRECT_URL).build().toString());
+        }
+        else if (!swaggerUiConfig.isValidUrl(swaggerUiConfig.getOauth2RedirectUrl())) {
             swaggerUiConfig.setOauth2RedirectUrl(ServletUriComponentsBuilder.fromCurrentContextPath().path(this.uiRootPath).path(swaggerUiConfig.getOauth2RedirectUrl()).build().toString());
         }
     }