feat: add alby client for lightning

adds alby client for lightning backend

.env.example

@@ -38,6 +38,8 @@ MINT_LIGHTNING_BACKEND=Lnbits
 LNBITS_URL=https://legend.lnbits.com
 LNBITS_ADMIN_KEY=YOUR_ADMIN_KEY
 
+ALBY_API_KEY=YOUR_API_KEY
+
 # absolute path to the lnd macaroon file
 LND_MACAROON_PATH="/.../admin.macaroon"
 # absolute path to the tls certificate

moksha-mint/src/alby.rs

@@ -0,0 +1,144 @@
+use hyper::{header::CONTENT_TYPE, http::HeaderValue};
+use serde::{Deserialize, Serialize};
+use url::Url;
+
+use crate::model::{CreateInvoiceParams, CreateInvoiceResult, PayInvoiceResult};
+
+#[derive(Debug, thiserror::Error)]
+pub enum AlbyError {
+    #[error("reqwest error: {0}")]
+    ReqwestError(#[from] reqwest::Error),
+
+    #[error("url error: {0}")]
+    UrlError(#[from] url::ParseError),
+
+    #[error("serde error: {0}")]
+    SerdeError(#[from] serde_json::Error),
+
+    #[error("Not found")]
+    NotFound,
+
+    #[error("Unauthorized")]
+    Unauthorized,
+}
+
+#[derive(Clone)]
+pub struct AlbyClient {
+    api_key: String,
+    alby_url: Url,
+    reqwest_client: reqwest::Client,
+}
+
+impl AlbyClient {
+    pub fn new(api_key: &str) -> Result<AlbyClient, AlbyError> {
+        let alby_url = Url::parse("https://api.getalby.com")?;
+
+        let reqwest_client = reqwest::Client::builder().build()?;
+
+        Ok(AlbyClient {
+            api_key: api_key.to_owned(),
+            alby_url,
+            reqwest_client,
+        })
+    }
+}
+
+impl AlbyClient {
+    pub async fn make_get(&self, endpoint: &str) -> Result<String, AlbyError> {
+        let url = self.alby_url.join(endpoint)?;
+        let response = self
+            .reqwest_client
+            .get(url)
+            .bearer_auth(self.api_key.clone())
+            .send()
+            .await?;
+
+        if response.status() == reqwest::StatusCode::NOT_FOUND {
+            return Err(AlbyError::NotFound);
+        }
+
+        Ok(response.text().await?)
+    }
+
+    pub async fn make_post(&self, endpoint: &str, body: &str) -> Result<String, AlbyError> {
+        let url = self.alby_url.join(endpoint)?;
+        let response = self
+            .reqwest_client
+            .post(url)
+            .bearer_auth(self.api_key.clone())
+            .header(
+                CONTENT_TYPE,
+                HeaderValue::from_str("application/json").expect("Invalid header value"),
+            )
+            .body(body.to_string())
+            .send()
+            .await?;
+
+        if response.status() == reqwest::StatusCode::NOT_FOUND {
+            return Err(AlbyError::NotFound);
+        }
+
+        if response.status() == reqwest::StatusCode::UNAUTHORIZED {
+            return Err(AlbyError::Unauthorized);
+        }
+
+        Ok(response.text().await?)
+    }
+}
+
+impl AlbyClient {
+    pub async fn create_invoice(
+        &self,
+        params: &CreateInvoiceParams,
+    ) -> Result<CreateInvoiceResult, AlbyError> {
+        let params = serde_json::json!({
+            "amount": params.amount,
+            "description": params.memo,
+        });
+
+        let body = self
+            .make_post("invoices", &serde_json::to_string(&params)?)
+            .await?;
+
+        let response: serde_json::Value = serde_json::from_str(&body)?;
+        let payment_request = response["payment_request"]
+            .as_str()
+            .expect("payment_request is empty")
+            .to_owned();
+        let payment_hash = response["payment_hash"]
+            .as_str()
+            .expect("payment_hash is empty")
+            .to_owned();
+
+        Ok(CreateInvoiceResult {
+            payment_hash: payment_hash.as_bytes().to_vec(),
+            payment_request,
+        })
+    }
+
+    pub async fn pay_invoice(&self, bolt11: &str) -> Result<PayInvoiceResult, AlbyError> {
+        let body = self
+            .make_post(
+                "payments/bolt11",
+                &serde_json::to_string(&serde_json::json!({"invoice": bolt11 }))?,
+            )
+            .await?;
+
+        let response: serde_json::Value = serde_json::from_str(&body)?;
+
+        Ok(PayInvoiceResult {
+            payment_hash: response["payment_hash"]
+                .as_str()
+                .expect("payment_hash is empty")
+                .to_owned(),
+        })
+    }
+
+    pub async fn is_invoice_paid(&self, payment_hash: &str) -> Result<bool, AlbyError> {
+        let body = self.make_get(&format!("invoices/{payment_hash}")).await?;
+
+        Ok(serde_json::from_str::<serde_json::Value>(&body)?["settled"]
+            .as_bool()
+            .unwrap_or(false))
+    }
+}

moksha-mint/src/bin/moksha-mint.rs

@@ -1,6 +1,8 @@
 use mokshamint::{
     info::MintInfoSettings,
-    lightning::{LightningType, LnbitsLightningSettings, LndLightningSettings},
+    lightning::{
+        AlbyLightningSettings, LightningType, LnbitsLightningSettings, LndLightningSettings,
+    },
     MintBuilder,
 };
 use std::{env, fmt, net::SocketAddr, path::PathBuf};
@@ -44,6 +46,12 @@ pub async fn main() -> anyhow::Result<()> {
                 .expect("Please provide lnd info");
             LightningType::Lnd(lnd_settings)
         }
+        "Alby" => {
+            let alby_settings = envy::prefixed("ALBY_")
+                .from_env::<AlbyLightningSettings>()
+                .expect("Please provide alby info");
+            LightningType::Alby(alby_settings)
+        }
         _ => panic!(
             "env MINT_LIGHTNING_BACKEND not found or invalid values. Valid values are Lnbits and Lnd"
         ),

moksha-mint/src/error.rs

@@ -11,7 +11,7 @@ use thiserror::Error;
 use tonic_lnd::ConnectError;
 use tracing::{event, Level};
 
-use crate::lnbits::LNBitsError;
+use crate::{alby::AlbyError, lnbits::LNBitsError};
 
 #[derive(Error, Debug)]
 pub enum MokshaMintError {
@@ -24,6 +24,9 @@ pub enum MokshaMintError {
     #[error("Failed to pay invoice {0} - Error {1}")]
     PayInvoice(String, LNBitsError),
 
+    #[error("Failed to pay invoice {0} - Error {1}")]
+    PayInvoiceAlby(String, AlbyError),
+
     #[error("DB Error {0}")]
     Db(#[from] rocksdb::Error),
 
@@ -58,7 +61,10 @@ pub enum MokshaMintError {
     InvalidAmount,
 
     #[error("Lightning Error {0}")]
-    Lightning(#[from] LNBitsError),
+    LightningLNBits(#[from] LNBitsError),
+
+    #[error("Lightning Error {0}")]
+    LightningAlby(#[from] AlbyError),
 }
 
 impl IntoResponse for MokshaMintError {

moksha-mint/src/lib.rs

@@ -13,7 +13,7 @@ use error::MokshaMintError;
 use hyper::http::{HeaderName, HeaderValue};
 use hyper::Method;
 use info::{MintInfoResponse, MintInfoSettings, Parameter};
-use lightning::{Lightning, LightningType, LnbitsLightning};
+use lightning::{AlbyLightning, Lightning, LightningType, LnbitsLightning};
 use mint::{LightningFeeConfig, Mint};
 use model::{GetMintQuery, PostMintQuery};
 use moksha_core::model::{
@@ -33,6 +33,7 @@ use tracing::{event, info, Level};
 use tracing_subscriber::prelude::__tracing_subscriber_SubscriberExt;
 use tracing_subscriber::util::SubscriberInitExt;
 
+mod alby;
 mod database;
 mod error;
 pub mod info;
@@ -88,7 +89,9 @@ impl MintBuilder {
                 lnbits_settings.admin_key.expect("LNBITS_ADMIN_KEY not set"),
                 lnbits_settings.url.expect("LNBITS_URL not set"),
             )),
-
+            Some(LightningType::Alby(alby_settings)) => Arc::new(AlbyLightning::new(
+                alby_settings.api_key.expect("ALBY_API_KEY not set"),
+            )),
             Some(LightningType::Lnd(lnd_settings)) => Arc::new(
                 lightning::LndLightning::new(
                     lnd_settings.grpc_host.expect("LND_GRPC_HOST not set"),