Add FiatAPI methods to Liquid SDK (#331)

* Add FiatAPI methods to Liquid SDK

* Add mirrored structs of fiat crate on Dart bindings

* Re-generate bindings

* Fix sdk-common imports

* Avoid using hardcoded Breez Server URL, re-use sdk-common constant

* Update Cargo.lock

---------

Co-authored-by: Erdem Yerebasmaz <erdem@yerebasmaz.com>

lib/bindings/src/breez_liquid_sdk.udl

@@ -191,6 +191,44 @@ interface LnUrlAuthError {
     ServiceConnectivity(string err);
 };
 
+dictionary Rate {
+    string coin;
+    f64 value;
+};
+
+dictionary FiatCurrency {
+    string id;
+    CurrencyInfo info;
+};
+
+dictionary Symbol {
+    string? grapheme;
+    string? template;
+    boolean? rtl;
+    u32? position;
+};
+
+dictionary LocaleOverrides {
+    string locale;
+    u32? spacing;
+    Symbol symbol;
+};
+
+dictionary LocalizedName {
+    string locale;
+    string name;
+};
+
+dictionary CurrencyInfo {
+    string name;
+    u32 fraction_size;
+    u32? spacing;
+    Symbol? symbol;
+    Symbol? uniq_symbol;
+    sequence<LocalizedName> localized_name;
+    sequence<LocaleOverrides> locale_overrides;
+};
+
 // END sdk-common mirror imports
 ////////////////////////////////
 
@@ -498,4 +536,10 @@ interface BindingLiquidSdk {
 
     [Throws=LnUrlAuthError]
     LnUrlCallbackStatus lnurl_auth(LnUrlAuthRequestData req_data);
+
+    [Throws=LiquidSdkError]
+    sequence<Rate> fetch_fiat_rates();
+
+    [Throws=LiquidSdkError]
+    sequence<FiatCurrency> list_fiat_currencies();
 };

lib/bindings/src/lib.rs

@@ -6,11 +6,12 @@ use anyhow::Result;
 use breez_liquid_sdk::logger::Logger;
 use breez_liquid_sdk::{
     error::*, model::*, sdk::LiquidSdk, AesSuccessActionDataDecrypted, AesSuccessActionDataResult,
-    BitcoinAddressData, InputType, LNInvoice, LnUrlAuthError, LnUrlAuthRequestData,
-    LnUrlCallbackStatus, LnUrlErrorData, LnUrlPayError, LnUrlPayErrorData, LnUrlPayRequest,
-    LnUrlPayRequestData, LnUrlWithdrawError, LnUrlWithdrawRequest, LnUrlWithdrawRequestData,
-    LnUrlWithdrawResult, LnUrlWithdrawSuccessData, MessageSuccessActionData, Network, RouteHint,
-    RouteHintHop, SuccessActionProcessed, UrlSuccessActionData,
+    BitcoinAddressData, CurrencyInfo, FiatCurrency, InputType, LNInvoice, LnUrlAuthError,
+    LnUrlAuthRequestData, LnUrlCallbackStatus, LnUrlErrorData, LnUrlPayError, LnUrlPayErrorData,
+    LnUrlPayRequest, LnUrlPayRequestData, LnUrlWithdrawError, LnUrlWithdrawRequest,
+    LnUrlWithdrawRequestData, LnUrlWithdrawResult, LnUrlWithdrawSuccessData, LocaleOverrides,
+    LocalizedName, MessageSuccessActionData, Network, Rate, RouteHint, RouteHintHop,
+    SuccessActionProcessed, Symbol, UrlSuccessActionData,
 };
 use log::{Metadata, Record, SetLoggerError};
 use once_cell::sync::Lazy;
@@ -169,6 +170,14 @@ impl BindingLiquidSdk {
         rt().block_on(self.sdk.lnurl_auth(req_data))
     }
 
+    pub fn fetch_fiat_rates(&self) -> Result<Vec<Rate>, LiquidSdkError> {
+        rt().block_on(self.sdk.fetch_fiat_rates())
+    }
+
+    pub fn list_fiat_currencies(&self) -> Result<Vec<FiatCurrency>, LiquidSdkError> {
+        rt().block_on(self.sdk.list_fiat_currencies())
+    }
+
     pub fn list_refundables(&self) -> LiquidSdkResult<Vec<RefundableSwap>> {
         rt().block_on(self.sdk.list_refundables())
     }