make maxSendable dynamic through env variables

Signed-off-by: Nitesh Balusu <[email protected]>

.env.example

@@ -11,3 +11,4 @@ INCLUDE_HOP_HINTS=true # Adds route hints to an invoice
 NOSTR_PRIVATE_KEY="Random nsec or hex private key to sign zaps" 
 NIP_05_PUBKEY="Your npub or hex public key"
 RELAYS="wss://relay.nostr.band, wss://nostr-pub.wellorder.net, wss://brb.io" # comma separated list of relays
+MAX_SENDABLE=100000 #Max amount someone can send you in milli sats.

.vscode/settings.json

@@ -1,6 +1,6 @@
 {
   "[rust]": {
-      "editor.defaultFormatter": "rust-lang.rust-analyzer",
-      "editor.formatOnSave": true
+    "editor.defaultFormatter": "rust-lang.rust-analyzer",
+    "editor.formatOnSave": true
   },
-}
+}

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustdress"
-version = "0.4.14"
+version = "0.5.14"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/server/constants.rs

@@ -46,6 +46,7 @@ pub enum EnvVariables {
     NOSTR_PRIVATE_KEY,
     NIP_05_PUBKEY,
     RELAYS,
+    MAX_SENDABLE,
 }
 
 impl AsRef<OsStr> for EnvVariables {
@@ -64,6 +65,7 @@ impl AsRef<OsStr> for EnvVariables {
             EnvVariables::NOSTR_PRIVATE_KEY => OsStr::new("NOSTR_PRIVATE_KEY"),
             EnvVariables::NIP_05_PUBKEY => OsStr::new("NIP_05_PUBKEY"),
             EnvVariables::RELAYS => OsStr::new("RELAYS"),
+            EnvVariables::MAX_SENDABLE => OsStr::new("MAX_SENDABLE"),
         }
     }
 }

src/server/parsing_functions.rs

@@ -1,3 +1,5 @@
+use std::env;
+
 use hyper::{Body, Response, StatusCode};
 use rusted_nostr_tools::{
     event_methods::{get_event_hash, SignedEvent, UnsignedEvent},
@@ -9,7 +11,10 @@ use urlencoding::decode;
 
 use crate::server::constants::CONSTANTS;
 
-use super::utils::{get_identifiers, get_nostr_keys};
+use super::{
+    constants::EnvVariables,
+    utils::{get_identifiers, get_nostr_keys},
+};
 
 pub fn find_key<'a>(key: &'a str, vector: &'a [(String, String)]) -> Option<&'a (String, String)> {
     vector.iter().find(|(k, _)| *k == key)
@@ -202,10 +207,24 @@ pub fn handle_response_body() -> String {
 
     let lnurl_url = "https://".to_owned() + &domain + "/.well-known/lnurlp/" + username.as_str();
 
+    let max_sendable = match env::var(EnvVariables::MAX_SENDABLE)
+        .unwrap_or(CONSTANTS.max_sendamount.to_string())
+        .parse::<i64>()
+    {
+        Ok(n) => {
+            if n < 1000 {
+                CONSTANTS.max_sendamount
+            } else {
+                n
+            }
+        }
+        Err(_) => CONSTANTS.max_sendamount,
+    };
+
     let mut response_body = json!({
         "callback": lnurl_url,
         "commentAllowed": CONSTANTS.max_comment_length,
-        "maxSendable": CONSTANTS.max_sendamount,
+        "maxSendable": max_sendable,
         "metadata": metadata,
         "minSendable": CONSTANTS.min_sendamount,
         "tag": "payRequest",