Added Registration API

src/invidious/routes/api/v1/authentication.cr

@@ -1,4 +1,74 @@
 module Invidious::Routes::API::V1::Authentication
+  def self.register(env)
+    env.response.content_type = "application/json"
+    if !CONFIG.registration_enabled
+      return error_json(400, "Registration has been disabled by administrator")
+    else
+      # check if user is registering or responding to captcha
+      begin
+        creds = Credentials.from_json(env.request.body || "{}")
+      rescue JSON::SerializableError
+        creds = nil
+      end
+
+      begin
+        captcha_response = CaptchaRespone.from_json(env.request.body || "{}")
+      rescue JSON::SerializableError
+        captcha_response = nil
+      end
+
+      if creds
+        # user is registering
+        password = creds.password
+        username = creds.username
+        if creds.password.empty?
+          return error_json(401, "Password cannot be empty")
+        end
+        # See https://security.stackexchange.com/a/39851
+        if creds.password.bytesize > 55
+          return error_json(400, "Password cannot be longer than 55 characters")
+        end
+
+        password = password.byte_slice(0, 55)
+
+        if CONFIG.captcha_enabled
+          # if captcha is enabled, send captcha
+          captcha = Invidious::User::Captcha.generate_text(HMAC_KEY)
+          # puts captcha
+          return captcha
+        end
+      end
+      if captcha_response
+        # process captcha response
+        answer = captcha_response.answer
+        answer = answer.lstrip('0')
+        answer = OpenSSL::HMAC.hexdigest(:sha256, HMAC_KEY, answer)
+        begin
+          validate_request(tokens[0], answer, env.request, HMAC_KEY, locale)
+        rescue ex
+          return error_jsonror(400, ex)
+        end
+      end
+      # create user if we made it past credentials and captcha
+      sid = Base64.urlsafe_encode(Random::Secure.random_bytes(32))
+      user, sid = create_user(sid, email, password)
+      Invidious::Database::Users.insert(user)
+      Invidious::Database::SessionIDs.insert(sid, email)
+      # send user info
+      if token = Invidious::Database::SessionIDs.select_one(sid: sid)
+        response = JSON.build do |json|
+          json.object do
+            json.field "session", token[:session]
+            json.field "issued", token[:issued].to_unix
+          end
+        end
+        return response
+      else
+        return error_json(500, "Token not found")
+      end
+    end
+  end
+
   def self.login(env)
     env.response.content_type = "application/json"
     # locale = env.get("preferences").as(Preferences).locale
@@ -44,6 +114,13 @@ module Invidious::Routes::API::V1::Authentication
   end
 end
 
+struct CaptchaResponse
+  include JSON::Serializable
+  include YAML::Serializable
+
+  property answer : String
+end
+
 struct Credentials
   include JSON::Serializable
   include YAML::Serializable