added templating support

changed ping command to use templates
added userjoin/userleave event
added guild to command context
refactored post target service
added logging output to initial loading
added server_id to postTarget
added leave log postTarget

abstracto-application/templating/templating-impl/src/main/java/dev/sheldan/abstracto/templating/config/FreemarkerConfiguration.java

@@ -0,0 +1,24 @@
+package dev.sheldan.abstracto.templating.config;
+
+import dev.sheldan.abstracto.templating.loading.DatabaseTemplateLoader;
+import freemarker.template.Configuration;
+import freemarker.template.TemplateException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.ui.freemarker.FreeMarkerConfigurationFactory;
+
+import java.io.IOException;
+
+@org.springframework.context.annotation.Configuration
+public class FreemarkerConfiguration {
+
+    @Autowired
+    private DatabaseTemplateLoader templateLoader;
+
+    @Bean
+    public Configuration freeMarkerConfiguration() throws IOException, TemplateException {
+        FreeMarkerConfigurationFactory factory = new FreeMarkerConfigurationFactory();
+        factory.setPreTemplateLoaders(templateLoader);
+        return factory.createConfiguration();
+    }
+}

abstracto-application/templating/templating-impl/src/main/java/dev/sheldan/abstracto/templating/loading/DatabaseTemplateLoader.java

@@ -0,0 +1,49 @@
+package dev.sheldan.abstracto.templating.loading;
+
+import dev.sheldan.abstracto.templating.TemplateDto;
+import dev.sheldan.abstracto.templating.TemplateService;
+import freemarker.cache.TemplateLoader;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+
+@Component
+public class DatabaseTemplateLoader implements TemplateLoader {
+
+    @Autowired
+    private TemplateService templateService;
+
+    @Override
+    public Object findTemplateSource(String s) throws IOException {
+        TemplateDto templateDtoByKey = templateService.getTemplateByKey(s);
+        if(templateDtoByKey != null){
+            return templateDtoByKey;
+        } else {
+            return null;
+        }
+    }
+
+    @Override
+    public long getLastModified(Object o) {
+        TemplateDto casted = (TemplateDto) o;
+        TemplateDto templateDtoByKey = templateService.getTemplateByKey(casted.getKey());
+        if(templateDtoByKey != null){
+            return templateDtoByKey.getLastModified().getEpochSecond();
+        } else {
+            return Long.MAX_VALUE;
+        }
+    }
+
+    @Override
+    public Reader getReader(Object o, String s) throws IOException {
+        return new StringReader(((TemplateDto) o).getContent());
+    }
+
+    @Override
+    public void closeTemplateSource(Object o) throws IOException {
+
+    }
+}

abstracto-application/templating/templating-impl/src/main/java/dev/sheldan/abstracto/templating/loading/TemplateRepository.java

@@ -0,0 +1,7 @@
+package dev.sheldan.abstracto.templating.loading;
+
+import dev.sheldan.abstracto.templating.TemplateDto;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface TemplateRepository extends JpaRepository<TemplateDto, String> {
+}

abstracto-application/templating/templating-impl/src/main/java/dev/sheldan/abstracto/templating/loading/TemplateServiceBean.java

@@ -0,0 +1,52 @@
+package dev.sheldan.abstracto.templating.loading;
+
+import dev.sheldan.abstracto.templating.TemplateDto;
+import dev.sheldan.abstracto.templating.TemplateService;
+import freemarker.template.Configuration;
+import freemarker.template.TemplateException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.stereotype.Component;
+import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.util.HashMap;
+
+@Component
+public class TemplateServiceBean implements TemplateService {
+
+    @Autowired
+    private TemplateRepository repository;
+
+    @Autowired
+    private Configuration configuration;
+
+    @Override
+    @Cacheable("template")
+    public TemplateDto getTemplateByKey(String key) {
+        return repository.getOne(key);
+    }
+
+    @Override
+    public String renderTemplate(TemplateDto templateDto) {
+        return null;
+    }
+
+    @Override
+    public String renderTemplate(String key, HashMap<String, Object> parameters) {
+        try {
+            return FreeMarkerTemplateUtils.processTemplateIntoString(configuration.getTemplate(key), parameters);
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (TemplateException e) {
+            e.printStackTrace();
+        }
+        return "";
+    }
+
+    @Override
+    public void createTemplate(String key, String content) {
+        repository.save(TemplateDto.builder().key(key).content(content).lastModified(Instant.now()).build());
+    }
+}

abstracto-application/templating/templating-impl/src/main/java/dev/sheldan/abstracto/templating/seeddata/TemplateSeedDataLoader.java

@@ -0,0 +1,40 @@
+package dev.sheldan.abstracto.templating.seeddata;
+
+import dev.sheldan.abstracto.templating.TemplateService;
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.io.IOUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.context.event.EventListener;
+import org.springframework.core.io.Resource;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.List;
+
+@Component
+public class TemplateSeedDataLoader {
+
+    @Value("classpath*:**/templates/**/*.ftl")
+    private Resource[] resources;
+
+    @Autowired
+    private TemplateService service;
+
+    @EventListener
+    public void handleContextRefreshEvent(ContextRefreshedEvent ctxStartEvt) {
+        List<Resource> templatesToLoad = Arrays.asList(resources);
+        templatesToLoad.forEach(resource -> {
+            try {
+                String templateKey = FilenameUtils.getBaseName(resource.getFilename());
+                String templateContent = IOUtils.toString(resource.getURI(), Charset.defaultCharset());
+                service.createTemplate(templateKey, templateContent);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        });
+    }
+}