Custom HTML support #355 (#1129)

* test

* settings

* version

README.md

@@ -201,7 +201,7 @@ Stirling PDF allows easy customization of the app.
 Includes things like
 
 - Custom application name
-- Custom slogans, icons, images css etc (via file overrides) (Does not currently support html)
+- Custom slogans, icons, HTML, images CSS etc (via file overrides) 
 
 There are two options for this, either using the generated settings file ``settings.yml``
 This file is located in the ``/configs`` directory and follows standard YAML formatting
@@ -229,6 +229,7 @@ system:
   customStaticFilePath: '/customFiles/static/' # Directory path for custom static files
   showUpdate: true # see when a new update is available
   showUpdateOnlyAdmin: false # Only admins can see when a new update is available, depending on showUpdate it must be set to 'true'
+  customHTMLFiles: false # enable to have files placed in /customFiles/templates override the existing template html files
 
 #ui:
 #  appName: exampleAppName # Application's visible name

build.gradle

@@ -12,7 +12,7 @@ plugins {
 import com.github.jk1.license.render.*
 
 group = 'stirling.software'
-version = '0.23.0'
+version = '0.23.1'
 sourceCompatibility = '17'
 
 repositories {

src/main/java/stirling/software/SPDF/config/AppConfig.java

@@ -7,18 +7,34 @@ import java.util.Properties;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.thymeleaf.spring6.SpringTemplateEngine;
 
 import stirling.software.SPDF.model.ApplicationProperties;
 
 @Configuration
+@Lazy
 public class AppConfig {
 
     @Autowired ApplicationProperties applicationProperties;
 
+    @Bean
+    @ConditionalOnProperty(
+            name = "system.customHTMLFiles",
+            havingValue = "true",
+            matchIfMissing = false)
+    public SpringTemplateEngine templateEngine(ResourceLoader resourceLoader) {
+        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
+        templateEngine.addTemplateResolver(new FileFallbackTemplateResolver(resourceLoader));
+        return templateEngine;
+    }
+
     @Bean(name = "loginEnabled")
     public boolean loginEnabled() {
         return applicationProperties.getSecurity().getEnableLogin();

src/main/java/stirling/software/SPDF/config/FileFallbackTemplateResolver.java

@@ -0,0 +1,48 @@
+package stirling.software.SPDF.config;
+
+import java.io.IOException;
+import java.util.Map;
+
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.thymeleaf.IEngineConfiguration;
+import org.thymeleaf.templateresolver.AbstractConfigurableTemplateResolver;
+import org.thymeleaf.templateresource.ClassLoaderTemplateResource;
+import org.thymeleaf.templateresource.FileTemplateResource;
+import org.thymeleaf.templateresource.ITemplateResource;
+
+public class FileFallbackTemplateResolver extends AbstractConfigurableTemplateResolver {
+
+    private final ResourceLoader resourceLoader;
+
+    public FileFallbackTemplateResolver(ResourceLoader resourceLoader) {
+        super();
+        this.resourceLoader = resourceLoader;
+        setSuffix(".html");
+    }
+
+    // Note this does not work in local IDE, Prod jar only.
+    @Override
+    protected ITemplateResource computeTemplateResource(
+            IEngineConfiguration configuration,
+            String ownerTemplate,
+            String template,
+            String resourceName,
+            String characterEncoding,
+            Map<String, Object> templateResolutionAttributes) {
+        Resource resource =
+                resourceLoader.getResource("file:./customFiles/templates/" + resourceName);
+        try {
+            if (resource.exists() && resource.isReadable()) {
+                return new FileTemplateResource(resource.getFile().getPath(), characterEncoding);
+            }
+        } catch (IOException e) {
+            
+        }
+
+        return new ClassLoaderTemplateResource(
+                Thread.currentThread().getContextClassLoader(),
+                "classpath:/templates/" + resourceName,
+                characterEncoding);
+    }
+}

src/main/java/stirling/software/SPDF/model/ApplicationProperties.java

@@ -212,6 +212,15 @@ public class ApplicationProperties {
         private Integer maxFileSize;
         private boolean showUpdate;
         private Boolean showUpdateOnlyAdmin;
+        private boolean customHTMLFiles;
+
+        public boolean isCustomHTMLFiles() {
+            return customHTMLFiles;
+        }
+
+        public void setCustomHTMLFiles(boolean customHTMLFiles) {
+            this.customHTMLFiles = customHTMLFiles;
+        }
 
         public boolean getShowUpdateOnlyAdmin() {
             return showUpdateOnlyAdmin;

src/main/resources/settings.yml.template

@@ -14,6 +14,7 @@ system:
   enableAlphaFunctionality: false # Set to enable functionality which might need more testing before it fully goes live (This feature might make no changes)
   showUpdate: true # see when a new update is available
   showUpdateOnlyAdmin: false # Only admins can see when a new update is available, depending on showUpdate it must be set to 'true'
+  customHTMLFiles: false # Enable to have files placed in /customFiles/templates override the existing template html files
   
 #ui:
 #  appName: exampleAppName # Application's visible name