Load TLS config files from config path before stash home (#1678)

* Load tls files from config or home directory
* Update README
* Require both ssl files if either present

pkg/manager/config/config.go

@@ -157,18 +157,11 @@ func (e MissingConfigError) Error() string {
 	return fmt.Sprintf("missing the following mandatory settings: %s", strings.Join(e.missingFields, ", "))
 }
 
-func HasTLSConfig() bool {
-	ret, _ := utils.FileExists(paths.GetSSLCert())
-	if ret {
-		ret, _ = utils.FileExists(paths.GetSSLKey())
-	}
-
-	return ret
-}
-
 type Instance struct {
 	cpuProfilePath string
 	isNewSystem    bool
+	certFile       string
+	keyFile        string
 	sync.RWMutex
 	//deadlock.RWMutex // for deadlock testing/issues
 }
@@ -192,6 +185,26 @@ func (i *Instance) SetConfigFile(fn string) {
 	viper.SetConfigFile(fn)
 }
 
+func (i *Instance) InitTLS() {
+	configDirectory := i.GetConfigPath()
+	tlsPaths := []string{
+		configDirectory,
+		paths.GetStashHomeDirectory(),
+	}
+
+	i.certFile = utils.FindInPaths(tlsPaths, "stash.crt")
+	i.keyFile = utils.FindInPaths(tlsPaths, "stash.key")
+}
+
+func (i *Instance) GetTLSFiles() (certFile, keyFile string) {
+	return i.certFile, i.keyFile
+}
+
+func (i *Instance) HasTLSConfig() bool {
+	certFile, keyFile := i.GetTLSFiles()
+	return certFile != "" && keyFile != ""
+}
+
 // GetCPUProfilePath returns the path to the CPU profile file to output
 // profiling info to. This is set only via a commandline flag. Returns an
 // empty string if not set.