func templateSource(fs vfs.Opener, fName string) (string, error) {
tmplFile, err := fs.Open(fName)
if err != nil {
return "", err
}
tmplB := &bytes.Buffer{}
_, err = tmplB.ReadFrom(tmplFile)
return tmplB.String(), err
}
// IsTextFile reports whether the file has a known extension indicating
// a text file, or if a significant chunk of the specified file looks like
// correct UTF-8; that is, if it is likely that the file contains human-
// readable text.
func IsTextFile(fs vfs.Opener, filename string) bool {
// if the extension is known, use it for decision making
if isText, found := textExt[pathpkg.Ext(filename)]; found {
return isText
}
// the extension is not known; read an initial chunk
// of the file and check if it looks like text
f, err := fs.Open(filename)
if err != nil {
return false
}
defer f.Close()
var buf [1024]byte
n, err := f.Read(buf[0:])
if err != nil {
return false
}
return IsText(buf[0:n])
}
func MakeFnIncludeFile(opener vfs.Opener, rules *template.Rules) template.Rule {
return func(path []interface{}, node interface{}) (interface{}, interface{}) {
key := interface{}(nil)
if len(path) > 0 {
key = path[len(path)-1]
}
argInterface, ok := singleKey(node, "Fn::IncludeFile")
if !ok {
return key, node //passthru
}
var argString string
if argString, ok = argInterface.(string); !ok {
return key, node //passthru
}
var absPath string
var err error
if absPath, err = filepath.Abs(argString); err != nil {
panic(fmt.Errorf("Error opening imported file '%s': %s", argString, err))
}
var jsonStream io.Reader
if jsonStream, err = opener.Open(absPath); err != nil {
panic(fmt.Errorf("Error opening imported file '%s': %s", absPath, err))
}
dec := json.NewDecoder(jsonStream)
includedTemplate := interface{}(nil)
if err := dec.Decode(&includedTemplate); err != nil {
panic(fmt.Errorf("Error loading imported file '%s': %s", argString, err))
}
key, generated := template.Walk(path, includedTemplate, rules)
return key, interface{}(generated)
}
}
func MakeFnIncludeFileRaw(opener vfs.Opener) template.Rule {
return func(path []interface{}, node interface{}) (interface{}, interface{}) {
key := interface{}(nil)
if len(path) > 0 {
key = path[len(path)-1]
}
argInterface, ok := singleKey(node, "Fn::IncludeFileRaw")
if !ok {
return key, node //passthru
}
var argString string
if argString, ok = argInterface.(string); !ok {
return key, node //passthru
}
var absPath string
var err error
if absPath, err = filepath.Abs(argString); err != nil {
panic(fmt.Errorf("Error opening imported file '%s': %s", argString, err))
}
var dataStream io.Reader
if dataStream, err = opener.Open(absPath); err != nil {
panic(fmt.Errorf("Error opening imported file '%s': %s", absPath, err))
}
var data []byte
if data, err = ioutil.ReadAll(dataStream); err != nil {
panic(fmt.Errorf("Error loading imported file '%s': %s", argString, err))
}
return key, interface{}(string(data))
}
}