From f232e7401502129433b390206ba22ee221a73530 Mon Sep 17 00:00:00 2001
From: Pedro Perafan <pedroperafan18@gmail.com>
Date: Sun, 9 Nov 2025 00:29:35 -0600
Subject: [PATCH] feat: Add API versioning for v2
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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- Move all endpoints to /api/v1 namespace
- Use sinatra-contrib for namespace support
- Set JSON content type for all API v1 endpoints
- Maintain backward compatibility with root endpoint

API changes:
- POST /chain → POST /api/v1/chain
- POST /chain/:id/block → POST /api/v1/chain/:id/block
- POST /chain/:id/block/:block_id/valid → POST /api/v1/chain/:id/block/:block_id/valid

This allows for future API versions while maintaining stability
for v1 consumers.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 Gemfile      |  3 ++-
 Gemfile.lock |  9 +++++++
 main.rb      | 74 +++++++++++++++++++++++++++++-----------------------
 3 files changed, 53 insertions(+), 33 deletions(-)

diff --git a/Gemfile b/Gemfile
index 6591d82..75e3710 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,7 @@ ruby '3.2.2'
 
 gem 'dotenv', '~> 2.7'
 gem 'mongoid', '~> 7.0.5'
+gem 'rackup', '~> 2.1.0'
 gem 'rspec', '~> 3.10'
 gem 'sinatra', '~> 4.0.0'
-gem 'rackup', '~> 2.1.0'
+gem 'sinatra-contrib', '~> 4.0.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index f00e547..71b2fff 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,6 +22,7 @@ GEM
     mongoid (7.0.13)
       activemodel (>= 5.1, < 6.2)
       mongo (>= 2.7.0, < 3.0.0)
+    multi_json (1.17.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     rack (3.0.8)
@@ -53,6 +54,12 @@ GEM
       rack-protection (= 4.0.0)
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
+    sinatra-contrib (4.0.0)
+      multi_json (>= 0.0.2)
+      mustermann (~> 3.0)
+      rack-protection (= 4.0.0)
+      sinatra (= 4.0.0)
+      tilt (~> 2.0)
     tilt (2.3.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
@@ -60,6 +67,7 @@ GEM
     zeitwerk (2.6.12)
 
 PLATFORMS
+  arm64-darwin-25
   x86_64-linux
 
 DEPENDENCIES
@@ -68,6 +76,7 @@ DEPENDENCIES
   rackup (~> 2.1.0)
   rspec (~> 3.10)
   sinatra (~> 4.0.0)
+  sinatra-contrib (~> 4.0.0)
 
 RUBY VERSION
    ruby 3.2.2p53
diff --git a/main.rb b/main.rb
index fd0c317..75c612d 100644
--- a/main.rb
+++ b/main.rb
@@ -1,49 +1,59 @@
 # frozen_string_literal: true
+
 require 'sinatra'
+require 'sinatra/namespace'
 require 'json'
 require 'mongoid'
 require 'dotenv/load'
 require_relative 'src/blockchain'
+
 Mongoid.load!('./config/mongoid.yml', ENV['ENVIRONMENT'] || :development)
 
 get '/' do
   'Hello to ChainForge!'
 end
 
-post '/chain' do
-  blockchain = Blockchain.create
-  blockchain.save!
-  { id: blockchain.id }.to_json
-end
+# API v1
+namespace '/api/v1' do
+  before do
+    content_type :json
+  end
 
-post '/chain/:id/block' do
-  block_data = parse_json_body
-  chain_id = params[:id]
-  blockchain = find_block_chain(chain_id)
-  block = blockchain.add_block(block_data)
-
-  {
-    chain_id: chain_id,
-    block_id: block.id.to_s,
-    block_hash: block._hash
-  }.to_json
-end
+  post '/chain' do
+    blockchain = Blockchain.create
+    blockchain.save!
+    { id: blockchain.id }.to_json
+  end
 
-post '/chain/:id/block/:block_id/valid' do
-  block_data = parse_json_body
-  chain_id = params[:id]
-  block_id = params[:block_id]
-  blockchain = find_block_chain(chain_id)
-  block = blockchain.blocks.find(block_id)
-  raise 'Block not found' unless block
-
-  valid = block.valid_data?(block_id, block_data)
-
-  {
-    chain_id: chain_id,
-    block_id: block.id.to_s,
-    valid: valid
-  }.to_json
+  post '/chain/:id/block' do
+    block_data = parse_json_body
+    chain_id = params[:id]
+    blockchain = find_block_chain(chain_id)
+    block = blockchain.add_block(block_data['data'])
+
+    {
+      chain_id: chain_id,
+      block_id: block.id.to_s,
+      block_hash: block._hash
+    }.to_json
+  end
+
+  post '/chain/:id/block/:block_id/valid' do
+    block_data = parse_json_body
+    chain_id = params[:id]
+    block_id = params[:block_id]
+    blockchain = find_block_chain(chain_id)
+    block = blockchain.blocks.find(block_id)
+    raise 'Block not found' unless block
+
+    valid = block.valid_data?(block_data['data'])
+
+    {
+      chain_id: chain_id,
+      block_id: block.id.to_s,
+      valid: valid
+    }.to_json
+  end
 end
 
 helpers do