package com.github.dockerjava.core;

import com.fasterxml.jackson.annotation.JsonProperty;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.google.common.hash.HashFunction;

import com.google.common.hash.Hashing;

import java.io.File;

import java.io.IOException;

import java.nio.charset.StandardCharsets;

import java.util.Optional;

public class DockerContextMetaFile {

private static HashFunction metaHashFunction = Hashing.sha256();

@JsonProperty("Name")

String name;

@JsonProperty("Endpoints")

Endpoints endpoints;

public static class Endpoints {

@JsonProperty("docker")

Docker docker;

public static class Docker {

@JsonProperty("Host")

String host;

@JsonProperty("SkipTLSVerify")

boolean skipTLSVerify;

}

}

public static Optional<DockerContextMetaFile> resolveContextMetaFile(ObjectMapper objectMapper, File dockerConfigPath, String context) {

final File path = dockerConfigPath.toPath()

.resolve("contexts")

.resolve("meta")

.resolve(metaHashFunction.hashString(context, StandardCharsets.UTF_8).toString())

.resolve("meta.json")

.toFile();

return Optional.ofNullable(loadContextMetaFile(objectMapper, path));

}

public static Optional<File> resolveContextTLSFile(File dockerConfigPath, String context) {

final File path = dockerConfigPath.toPath()

.resolve("contexts")

.resolve("tls")

.resolve(metaHashFunction.hashString(context, StandardCharsets.UTF_8).toString())

.resolve("docker")

.toFile();

return Optional.ofNullable(path).filter(File::exists);

}

public static DockerContextMetaFile loadContextMetaFile(ObjectMapper objectMapper, File dockerContextMetaFile) {

try {

return parseContextMetaFile(objectMapper, dockerContextMetaFile);

} catch (Exception exception) {

return null;

}

}

public static DockerContextMetaFile parseContextMetaFile(ObjectMapper objectMapper, File dockerContextMetaFile) throws IOException {

try {

return objectMapper.readValue(dockerContextMetaFile, DockerContextMetaFile.class);

} catch (IOException e) {

throw new IOException("Failed to parse docker context meta file " + dockerContextMetaFile, e);

}

}

}