package altsrc import ( "fmt" "io/ioutil" "net/http" "net/url" "os" "runtime" "strings" "github.com/urfave/cli/v2" "gopkg.in/yaml.v2" ) type yamlSourceContext struct { FilePath string } // NewYamlSourceFromFile creates a new Yaml InputSourceContext from a filepath. func NewYamlSourceFromFile(file string) (InputSourceContext, error) { ysc := &yamlSourceContext{FilePath: file} var results map[interface{}]interface{} err := readCommandYaml(ysc.FilePath, &results) if err != nil { return nil, fmt.Errorf("Unable to load Yaml file '%s': inner error: \n'%v'", ysc.FilePath, err.Error()) } return &MapInputSource{file: file, valueMap: results}, nil } // NewYamlSourceFromFlagFunc creates a new Yaml InputSourceContext from a provided flag name and source context. func NewYamlSourceFromFlagFunc(flagFileName string) func(context *cli.Context) (InputSourceContext, error) { return func(context *cli.Context) (InputSourceContext, error) { filePath := context.String(flagFileName) return NewYamlSourceFromFile(filePath) } } func readCommandYaml(filePath string, container interface{}) (err error) { b, err := loadDataFrom(filePath) if err != nil { return err } err = yaml.Unmarshal(b, container) if err != nil { return err } err = nil return } func loadDataFrom(filePath string) ([]byte, error) { u, err := url.Parse(filePath) if err != nil { return nil, err } if u.Host != "" { // i have a host, now do i support the scheme? switch u.Scheme { case "http", "https": res, err := http.Get(filePath) if err != nil { return nil, err } return ioutil.ReadAll(res.Body) default: return nil, fmt.Errorf("scheme of %s is unsupported", filePath) } } else if u.Path != "" { // i dont have a host, but I have a path. I am a local file. if _, notFoundFileErr := os.Stat(filePath); notFoundFileErr != nil { return nil, fmt.Errorf("Cannot read from file: '%s' because it does not exist.", filePath) } return ioutil.ReadFile(filePath) } else if runtime.GOOS == "windows" && strings.Contains(u.String(), "\\") { // on Windows systems u.Path is always empty, so we need to check the string directly. if _, notFoundFileErr := os.Stat(filePath); notFoundFileErr != nil { return nil, fmt.Errorf("Cannot read from file: '%s' because it does not exist.", filePath) } return ioutil.ReadFile(filePath) } return nil, fmt.Errorf("unable to determine how to load from path %s", filePath) }