Make code compatible with Ruby 2.7

Not including specs etc.

lib/nostr/client.rb

@@ -81,7 +81,7 @@ module Nostr
     # @return [Subscription] The subscription object
     #
     def subscribe(subscription_id: SecureRandom.hex, filter: Filter.new)
-      subscriptions[subscription_id] = Subscription.new(id: subscription_id, filter:)
+      subscriptions[subscription_id] = Subscription.new(id: subscription_id, filter: filter)
       parent_to_child_channel.push([ClientMessageType::REQ, subscription_id, filter.to_h].to_json)
       subscriptions[subscription_id]
     end

lib/nostr/event.rb

@@ -149,7 +149,9 @@ module Nostr
     #
     # @return [Array<String>] The event's updated list of tags
     #
-    def add_event_reference(event_id) = tags.push(['e', event_id])
+    def add_event_reference(event_id)
+      tags.push(['e', event_id])
+    end
 
     # Adds a reference to a pubkey as a 'p' tag
     #
@@ -163,7 +165,9 @@ module Nostr
     #
     # @return [Array<String>] The event's updated list of tags
     #
-    def add_pubkey_reference(pubkey) = tags.push(['p', pubkey.to_s])
+    def add_pubkey_reference(pubkey)
+      tags.push(['p', pubkey.to_s])
+    end
 
     # Signs an event with the user's private key
     #
@@ -212,13 +216,13 @@ module Nostr
     #
     def to_h
       {
-        id:,
+        id: id,
-        pubkey:,
+        pubkey: pubkey,
-        created_at:,
+        created_at: created_at,
-        kind:,
+        kind: kind,
-        tags:,
+        tags: tags,
-        content:,
+        content: content,
-        sig:
+        sig: sig
       }
     end
 

lib/nostr/filter.rb

@@ -148,14 +148,14 @@ module Nostr
     #
     def to_h
       {
-        ids:,
+        ids: ids,
-        authors:,
+        authors: authors,
-        kinds:,
+        kinds: kinds,
         '#e': e,
         '#p': p,
-        since:,
+        since: since,
         until: self.until,
-        limit:
+        limit: limit
       }.compact
     end
 

lib/nostr/keygen.rb

@@ -33,7 +33,7 @@ module Nostr
       private_key = generate_private_key
       public_key  = extract_public_key(private_key)
 
-      KeyPair.new(private_key:, public_key:)
+      KeyPair.new(private_key: private_key, public_key: public_key)
     end
 
     # Generates a private key

nostr.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = 'Client and relay implementation of the Nostr protocol.'
   spec.homepage = 'https://nostr-ruby.com/'
   spec.license = 'MIT'
-  spec.required_ruby_version = '>= 3.2.0'
+  spec.required_ruby_version = '>= 2.7.2'
   spec.metadata['rubygems_mfa_required'] = 'true'
 
   spec.metadata['homepage_uri'] = spec.homepage