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ConfigUtils.java
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ConfigUtils.java
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package fi.hsl.common.config;
import org.jetbrains.annotations.NotNull;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Optional;
import java.util.Scanner;
public class ConfigUtils {
private static final Logger log = LoggerFactory.getLogger(ConfigUtils.class);
private ConfigUtils() {}
@NotNull
public static String getEnvOrThrow(@NotNull String name) throws IllegalArgumentException {
return getEnv(name).orElseThrow(() -> new IllegalArgumentException("Missing required env variable " + name));
}
public static Optional<String> getEnv(@NotNull String name) {
return Optional.ofNullable(System.getenv(name));
}
public static Optional<Integer> safeParseInt(@NotNull String value) {
try {
int n = Integer.parseInt(value);
return Optional.of(n);
}
catch (NumberFormatException e) {
log.error("Failed to parse int from " + value, e);
return Optional.empty();
}
}
public static Optional<Integer> getIntEnv(@NotNull String name) {
return getEnv(name).flatMap(ConfigUtils::safeParseInt);
}
@NotNull
public static String getConnectionStringFromFileOrThrow() throws Exception {
return getSecretFromFileOrThrow("FILEPATH_CONNECTION_STRING", Optional.empty());
}
@NotNull
public static String getConnectionStringFromFileOrThrow(final Optional<String> defaultPath) throws Exception {
return getSecretFromFileOrThrow("FILEPATH_CONNECTION_STRING", defaultPath);
}
@NotNull
public static String getUsernameFromFileOrThrow() throws Exception {
return getSecretFromFileOrThrow("FILEPATH_USERNAME_SECRET", Optional.empty());
}
@NotNull
public static String getUsernameFromFileOrThrow(final Optional<String> defaultPath) throws Exception {
return getSecretFromFileOrThrow("FILEPATH_USERNAME_SECRET", defaultPath);
}
@NotNull
public static String getPasswordFromFileOrThrow() throws Exception {
return getSecretFromFileOrThrow("FILEPATH_PASSWORD_SECRET", Optional.empty());
}
@NotNull
public static String getPasswordFromFileOrThrow(final Optional<String> defaultPath) throws Exception {
return getSecretFromFileOrThrow("FILEPATH_PASSWORD_SECRET", defaultPath);
}
@NotNull
public static String getSecretFromFileOrThrow(@NotNull final String envName) throws Exception {
return getSecretFromFileOrThrow(envName, Optional.empty());
}
@NotNull
public static String getSecretFromFileOrThrow(@NotNull final String envName, final Optional<String> defaultPath) throws Exception {
String secretFilePath;
final Optional<String> maybeSecretFilePath = getEnv(envName);
if (maybeSecretFilePath.isPresent()) {
secretFilePath = maybeSecretFilePath.get();
} else if (defaultPath.isPresent()) {
secretFilePath = defaultPath.get();
} else {
throw new Exception("Failed to get path to secret file");
}
String secret;
try {
secret = Files.readString(Path.of(secretFilePath), StandardCharsets.UTF_8).strip();
} catch (Exception e) {
log.error("Failed to read secret file ({})", secretFilePath, e);
throw e;
}
if (secret.isEmpty()) {
throw new Exception("Secret file was empty (" + secretFilePath + ")");
}
return secret;
}
}