Implement support for additional properties files

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/java/com/fjordtek/bookstore/config/AdditionalPropertiesConfig.java

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+//Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
+package com.fjordtek.bookstore.config;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MutablePropertySources;
+import org.springframework.core.env.PropertiesPropertySource;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.support.PropertiesLoaderUtils;
+
+/**
+*
+* This class implements a custom EnvironmentPostProcessor interface.
+* <p>
+* Main purpose of this implementation is to load additional properties files into Spring
+* environment as early as possible during Spring Boot initialization process.
+* <p>
+* Loading of this class must be enabled in /resources/META-INF/spring.factories file.
+*
+* @author Pekka Helenius
+*/
+
+@Configuration
+//@Order(Ordered.LOWEST_PRECEDENCE)
+public class AdditionalPropertiesConfig implements EnvironmentPostProcessor {
+
+	private List<Resource> getAdditionalResources() {
+		List<Resource> resources = new ArrayList<Resource>();
+
+		// Add your additional properties files here
+		resources.add(new ClassPathResource("website.properties"));
+		resources.add(new ClassPathResource("authentication.properties"));
+
+		return resources;
+	}
+
+	@Override
+	public void postProcessEnvironment(
+			ConfigurableEnvironment environment,
+			SpringApplication application
+			) {
+
+		MutablePropertySources propertySources = environment.getPropertySources();
+
+		for (Resource res : getAdditionalResources()) {
+			try {
+				propertySources.addLast(
+						new PropertiesPropertySource(
+								res.getFilename(),
+								PropertiesLoaderUtils.loadProperties(res)
+								)
+						);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+
+	}
+
+}
+

bookstore/src/main/resources/META-INF/spring.factories

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+# Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
+org.springframework.boot.env.EnvironmentPostProcessor = com.fjordtek.bookstore.config.AdditionalPropertiesConfig

bookstore/src/main/resources/authentication.properties

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+# Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
+auth.field.username     = b_username
+auth.field.password     = b_password

bookstore/src/main/resources/website.properties

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+# Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
+# BookController
+# Public end points
+#
+page.url.index            = /
+page.url.login            = /login
+page.url.logout           = /logout
+
+page.url.list             = /booklist
+page.url.add              = /bookadd
+page.url.edit             = /bookedit
+page.url.delete           = /bookdelete
+
+page.url.apiref           = /apiref
+page.url.autherror        = /autherror
+
+page.url.error            = /error
+
+# BookRestController
+# Public JSON end points
+#
+page.url.json             = /json
+page.url.json.list        = ${page.url.list}
+page.url.json.book        = /book
+
+
+# BookBasePathAwareController
+# Native REST API end points
+#
+page.url.restapi.list     = /${page.url.list}
+
+# Bookstore assets & resources
+#
+page.url.resources.css    = /css
+page.url.resources.js     = /js
+page.url.resources.images = /images