package fetcher import ( "errors" "fmt" "net/http" "net/url" "os" "git.cryptic.systems/volker.raschek/dcmerge/pkg/domain/dockerCompose" "gopkg.in/yaml.v2" ) func Fetch(urls ...string) ([]*dockerCompose.Config, error) { dockerComposeConfigs := make([]*dockerCompose.Config, 0) for _, rawURL := range urls { dockerComposeURL, err := url.Parse(rawURL) if err != nil { return nil, err } switch { case dockerComposeURL.Scheme == "http" || dockerComposeURL.Scheme == "https": dockerComposeConfig, err := getDockerComposeViaHTTP(dockerComposeURL.String()) if err != nil { return nil, err } dockerComposeConfigs = append(dockerComposeConfigs, dockerComposeConfig) case dockerComposeURL.Scheme == "file": fallthrough default: dockerComposeConfig, err := readDockerComposeFromFile(dockerComposeURL.Path) if err != nil { return nil, err } dockerComposeConfigs = append(dockerComposeConfigs, dockerComposeConfig) } } return dockerComposeConfigs, nil } var ErrorPathIsDir error = errors.New("Path is a directory") func getDockerComposeViaHTTP(url string) (*dockerCompose.Config, error) { req, err := http.NewRequest(http.MethodGet, url, nil) if err != nil { return nil, err } resp, err := http.DefaultClient.Do(req) if err != nil { return nil, err } defer resp.Body.Close() if resp.StatusCode != http.StatusOK { return nil, fmt.Errorf("Received unexpected HTTP-Statuscode %v", resp.StatusCode) } dockerCompose := dockerCompose.NewConfig() yamlDecoder := yaml.NewDecoder(resp.Body) err = yamlDecoder.Decode(&dockerCompose) if err != nil { return nil, err } return dockerCompose, nil } func readDockerComposeFromFile(name string) (*dockerCompose.Config, error) { fileStat, err := os.Stat(name) switch { case errors.Is(err, os.ErrNotExist): return nil, err case fileStat.IsDir(): return nil, fmt.Errorf("%w: %s", ErrorPathIsDir, name) } file, err := os.Open(name) if err != nil { return nil, err } defer file.Close() dockerCompose := dockerCompose.NewConfig() yamlDecoder := yaml.NewDecoder(file) err = yamlDecoder.Decode(&dockerCompose) if err != nil { return nil, err } return dockerCompose, nil }