external auth: add example HTTP server to use as authentication hook

The server authenticate against an LDAP server.

examples/ldapauthserver/utils/utils.go

@@ -0,0 +1,28 @@
+package utils
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+// IsFileInputValid returns true this is a valid file name.
+// This method must be used before joining a file name, generally provided as
+// user input, with a directory
+func IsFileInputValid(fileInput string) bool {
+	cleanInput := filepath.Clean(fileInput)
+	if cleanInput == "." || cleanInput == ".." {
+		return false
+	}
+	return true
+}
+
+// IsStringPrefixInSlice searches a string prefix in a slice and returns true
+// if a matching prefix is found
+func IsStringPrefixInSlice(obj string, list []string) bool {
+	for _, v := range list {
+		if strings.HasPrefix(obj, v) {
+			return true
+		}
+	}
+	return false
+}

examples/ldapauthserver/utils/version.go

@@ -0,0 +1,41 @@
+package utils
+
+const version = "0.1.0-dev"
+
+var (
+	commit      = ""
+	date        = ""
+	versionInfo VersionInfo
+)
+
+// VersionInfo defines version details
+type VersionInfo struct {
+	Version    string `json:"version"`
+	BuildDate  string `json:"build_date"`
+	CommitHash string `json:"commit_hash"`
+}
+
+func init() {
+	versionInfo = VersionInfo{
+		Version:    version,
+		CommitHash: commit,
+		BuildDate:  date,
+	}
+}
+
+// GetVersionAsString returns the string representation of the VersionInfo struct
+func (v *VersionInfo) GetVersionAsString() string {
+	versionString := v.Version
+	if len(v.CommitHash) > 0 {
+		versionString += "-" + v.CommitHash
+	}
+	if len(v.BuildDate) > 0 {
+		versionString += "-" + v.BuildDate
+	}
+	return versionString
+}
+
+// GetAppVersion returns VersionInfo struct
+func GetAppVersion() VersionInfo {
+	return versionInfo
+}