lli - move custom engine to utils

Signed-off-by: lli <lli@anonyome.com>

aries/aries_vcx/src/common/signing.rs

@@ -1,25 +1,12 @@
 use aries_vcx_core::wallet::base_wallet::BaseWallet;
-use base64::{
-    self, alphabet,
-    engine::{general_purpose, DecodePaddingMode, GeneralPurpose, GeneralPurposeConfig},
-    Engine,
-};
+use base64::{self, engine::general_purpose, Engine};
 use messages::msg_fields::protocols::connection::{
     response::{ConnectionSignature, ResponseContent},
     ConnectionData,
 };
 use time;
 
-use crate::errors::error::prelude::*;
-
-/// A default [GeneralPurposeConfig] configuration with a [decode_padding_mode] of
-/// [DecodePaddingMode::Indifferent]
-pub const LENIENT_PAD: GeneralPurposeConfig =
-    GeneralPurposeConfig::new().with_decode_padding_mode(DecodePaddingMode::Indifferent);
-
-/// A [GeneralPurpose] engine using the [alphabet::URL_SAFE] base64 alphabet and
-/// [DecodePaddingMode::Indifferent] config to decode both padded and unpadded.
-pub const URL_SAFE_LENIENT: GeneralPurpose = GeneralPurpose::new(&alphabet::URL_SAFE, LENIENT_PAD);
+use crate::{errors::error::prelude::*, utils::base64::URL_SAFE_LENIENT};
 
 // Utility function to handle both padded and unpadded Base64URL data
 fn base64url_decode(encoded: &str) -> VcxResult<Vec<u8>> {

aries/aries_vcx/src/utils/base64.rs

@@ -0,0 +1,13 @@
+use base64::{
+    alphabet,
+    engine::{DecodePaddingMode, GeneralPurpose, GeneralPurposeConfig},
+};
+
+/// A default [GeneralPurposeConfig] configuration with a [decode_padding_mode] of
+/// [DecodePaddingMode::Indifferent]
+pub const LENIENT_PAD: GeneralPurposeConfig =
+    GeneralPurposeConfig::new().with_decode_padding_mode(DecodePaddingMode::Indifferent);
+
+/// A [GeneralPurpose] engine using the [alphabet::URL_SAFE] base64 alphabet and
+/// [DecodePaddingMode::Indifferent] config to decode both padded and unpadded.
+pub const URL_SAFE_LENIENT: GeneralPurpose = GeneralPurpose::new(&alphabet::URL_SAFE, LENIENT_PAD);

aries/aries_vcx/src/utils/mod.rs

@@ -26,6 +26,7 @@ macro_rules! secret {
     }};
 }
 
+pub mod base64;
 pub mod openssl;
 pub mod qualifier;