Remove default_currency() method from config object

Preparing for multi-currency deployments.

src/config/main.rs

@@ -15,7 +15,6 @@ use crate::utils::crypto::{
     generate_private_key,
     serialize_private_key,
 };
-use crate::utils::currencies::Currency;
 use crate::utils::files::{set_file_permissions, write_file};
 
 use super::blockchain::BlockchainConfig;
@@ -138,10 +137,6 @@ impl Config {
     pub fn media_dir(&self) -> PathBuf {
         self.storage_dir.join("media")
     }
-
-    pub fn default_currency(&self) -> Currency {
-        Currency::Ethereum
-    }
 }
 
 #[derive(Clone)]

src/mastodon_api/accounts/views.rs

@@ -63,6 +63,7 @@ use crate::utils::crypto::{
     generate_private_key,
     serialize_private_key,
 };
+use crate::utils::currencies::Currency;
 use super::helpers::get_relationship;
 use super::types::{
     Account,
@@ -237,11 +238,13 @@ async fn create_identity_proof(
     let actor_id = current_user.profile.actor_id(&config.instance_url());
     let did = proof_data.did.parse::<DidPkh>()
         .map_err(|_| ValidationError("invalid DID"))?;
-    if did.currency() != Some(config.default_currency()) {
+    if did.currency() != Some(Currency::Ethereum) {
+        // DID must point to Ethereum Mainnet because it is a valid
+        // identifier on any Ethereum chain
         return Err(ValidationError("unsupported chain ID").into());
     };
     let maybe_public_address =
-        current_user.public_wallet_address(&config.default_currency());
+        current_user.public_wallet_address(&Currency::Ethereum);
     if let Some(address) = maybe_public_address {
         if did.address != address {
             return Err(ValidationError("DID doesn't match current identity").into());

src/mastodon_api/oauth/views.rs

@@ -11,7 +11,7 @@ use crate::models::users::queries::{
     get_user_by_login_address,
 };
 use crate::utils::crypto::verify_password;
-use crate::utils::currencies::validate_wallet_address;
+use crate::utils::currencies::{validate_wallet_address, Currency};
 use super::types::{TokenRequest, TokenResponse};
 use super::utils::generate_access_token;
 
@@ -36,7 +36,7 @@ async fn token_view(
             // DEPRECATED
             let wallet_address = request_data.wallet_address.as_ref()
                 .ok_or(ValidationError("wallet address is required"))?;
-            validate_wallet_address(&config.default_currency(), wallet_address)?;
+            validate_wallet_address(&Currency::Ethereum, wallet_address)?;
             get_user_by_login_address(db_client, wallet_address).await?
         },
         "eip4361" => {

src/mastodon_api/statuses/views.rs

@@ -38,6 +38,7 @@ use crate::models::reactions::queries::{
     create_reaction,
     delete_reaction,
 };
+use crate::utils::currencies::Currency;
 use super::helpers::{
     build_status,
     build_status_list,
@@ -429,9 +430,9 @@ async fn get_signature(
         .ok_or(HttpError::NotSupported)?
         .ethereum_config()
         .ok_or(HttpError::NotSupported)?;
-    // User must have a public wallet address
+    // User must have a public ethereum address
     let wallet_address = current_user
-        .public_wallet_address(&config.default_currency())
+        .public_wallet_address(&Currency::Ethereum)
         .ok_or(HttpError::PermissionError)?;
     let post = get_post_by_id(db_client, &status_id).await?;
     if post.author.id != current_user.id || !post.is_public() || post.repost_of_id.is_some() {

src/mastodon_api/subscriptions/views.rs

@@ -36,11 +36,11 @@ pub async fn authorize_subscription(
         .ok_or(HttpError::NotSupported)?
         .ethereum_config()
         .ok_or(HttpError::NotSupported)?;
-    // The user must have a public wallet address,
+    // The user must have a public ethereum address,
     // because subscribers should be able
     // to verify that payments are actually sent to the recipient.
     let wallet_address = current_user
-        .public_wallet_address(&config.default_currency())
+        .public_wallet_address(&Currency::Ethereum)
         .ok_or(HttpError::PermissionError)?;
     let signature = create_subscription_signature(
         ethereum_config,