Add API tokens support (#9)

Make it possible to create token authorized to query predetermined set of routes.

Reviewed-on: #9
Co-authored-by: Pierre HUBERT <pierre.git@communiquons.org>
Co-committed-by: Pierre HUBERT <pierre.git@communiquons.org>

virtweb_backend/src/constants.rs

@@ -89,3 +89,21 @@ pub const NAT_MODE_ENV_VAR_NAME: &str = "NAT_MODE";
 
 /// Nat hook file path
 pub const NAT_HOOK_PATH: &str = "/etc/libvirt/hooks/network";
+
+/// Directory where API tokens are stored, inside storage directory
+pub const STORAGE_TOKENS_DIR: &str = "tokens";
+
+/// API token name min length
+pub const API_TOKEN_NAME_MIN_LENGTH: usize = 3;
+
+/// API token name max length
+pub const API_TOKEN_NAME_MAX_LENGTH: usize = 30;
+
+/// API token description min length
+pub const API_TOKEN_DESCRIPTION_MIN_LENGTH: usize = 5;
+
+/// API token description max length
+pub const API_TOKEN_DESCRIPTION_MAX_LENGTH: usize = 30;
+
+/// API token right path max length
+pub const API_TOKEN_RIGHT_PATH_MAX_LENGTH: usize = 255;