Handling request validation/authentication

controllers/responses/error.go

@@ -0,0 +1,50 @@
+package responses
+
+import (
+	"encoding/xml"
+)
+
+const (
+	ERROR_GENERIC = iota * 10
+	ERROR_MISSING_PARAMETER
+	ERROR_CLIENT_TOO_OLD
+	ERROR_SERVER_TOO_OLD
+	ERROR_AUTHENTICATION_FAIL
+	ERROR_AUTHORIZATION_FAIL
+	ERROR_TRIAL_EXPIRED
+	ERROR_DATA_NOT_FOUND
+)
+
+var (
+	errors map[int]string
+)
+
+func init() {
+	errors = make(map[int]string)
+	errors[ERROR_GENERIC] = "A generic error"
+	errors[ERROR_MISSING_PARAMETER] = "Required parameter is missing"
+	errors[ERROR_CLIENT_TOO_OLD] = "Incompatible Subsonic REST protocol version. Client must upgrade"
+	errors[ERROR_SERVER_TOO_OLD] = "Incompatible Subsonic REST protocol version. Server must upgrade"
+	errors[ERROR_AUTHENTICATION_FAIL] = "Wrong username or password"
+	errors[ERROR_AUTHORIZATION_FAIL] = "User is not authorized for the given operation"
+	errors[ERROR_TRIAL_EXPIRED] = "The trial period for the Subsonic server is over. Please upgrade to Subsonic Premium. Visit subsonic.org for details"
+	errors[ERROR_DATA_NOT_FOUND] = "The requested data was not found"
+}
+
+type error struct {
+	XMLName xml.Name`xml:"error"`
+	Code    int     `xml:"code,attr"`
+	Message string  `xml:"message,attr"`
+}
+
+func NewError(errorCode int) []byte {
+	response := NewEmpty()
+	response.Status = "fail"
+	if errors[errorCode] == "" {
+		errorCode = ERROR_GENERIC
+	}
+	xmlBody, _ := xml.Marshal(&error{Code: errorCode, Message: errors[errorCode]})
+	response.Body = xmlBody
+	xmlResponse, _ := xml.Marshal(response)
+	return []byte(xml.Header + string(xmlResponse))
+}