com.oembedler.moon.graphiql.boot.PropsLoader Maven / Gradle / Ivy
package com.oembedler.moon.graphiql.boot;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.util.StreamUtils;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Optional;
import java.util.Properties;
class PropsLoader {
private static final String GRAPHIQL_PROPS_PREFIX = "graphiql.props.";
private static final String GRAPHIQL_PROPS_RESOURCES_PREFIX = GRAPHIQL_PROPS_PREFIX + "resources.";
private static final String GRAPHIQL_PROPS_VALUES_PREFIX = GRAPHIQL_PROPS_PREFIX + "variables.";
private Environment environment;
PropsLoader(Environment environment) {
this.environment = environment;
}
String load() throws IOException {
PropertyGroupReader reader = new PropertyGroupReader(environment, GRAPHIQL_PROPS_VALUES_PREFIX);
Properties props = reader.load();
ObjectMapper objectMapper = new ObjectMapper();
loadPropFromResource("defaultQuery").ifPresent(it -> props.put("defaultQuery", it));
loadPropFromResource("query").ifPresent(it -> props.put("query", it));
loadPropFromResource("variables").ifPresent(it -> props.put("variables", it));
return objectMapper.writeValueAsString(props);
}
private Optional loadPropFromResource(String prop) throws IOException {
String property = GRAPHIQL_PROPS_RESOURCES_PREFIX + prop;
if (environment.containsProperty(property)) {
String location = environment.getProperty(property);
Resource resource = new ClassPathResource(location);
return Optional.of(loadResource(resource));
}
return Optional.empty();
}
private String loadResource(Resource resource) throws IOException {
try (InputStream inputStream = resource.getInputStream()) {
return StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);
}
}
}