Upgrade to Rails 7.0 and apply new framework defaults

* Remove `send_stream` method pulled in before upgrading Rails
* Remove spring, it is no longer included by default for new apps
* Remove deprecated options from environments
* Remove old asset paths and workarounds no longer needed
* Remove unnecessary `OAUTH_10_SUPPORT` const, LTI still uses OAuth 1.0
* Dump schema with new defaults (and specify precision for timestamps where needed)

config/initializers/content_security_policy.rb

@@ -2,66 +2,66 @@
 
 # Be sure to restart your server when you modify this file.
 
-# Define an application-wide content security policy
-# For further information see the following documentation
-# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
+# Define an application-wide content security policy.
+# See the Securing Rails Applications Guide for more information:
+# https://guides.rubyonrails.org/security.html#content-security-policy-header
 
 require_relative 'sentry_csp'
 require_relative 'sentry_javascript'
 
-def self.apply_yml_settings_for(policy)
-  csp_settings = CodeOcean::Config.new(:content_security_policy)
+module CSP
+  def self.apply_yml_settings_for(policy)
+    csp_settings = CodeOcean::Config.new(:content_security_policy)
 
-  csp_settings.read.each do |directive, additional_settings|
-    existing_settings = if directive == 'report_uri'
-                          ''
-                        else
-                          policy.public_send(directive) || []
-                        end
-    all_settings = existing_settings + additional_settings
-    policy.public_send(directive, *all_settings)
+    csp_settings.read.each do |directive, additional_settings|
+      existing_settings = if directive == 'report_uri'
+                            ''
+                          else
+                            policy.public_send(directive) || []
+                          end
+      all_settings = existing_settings + additional_settings
+      policy.public_send(directive, *all_settings)
+    end
+  end
+
+  def self.apply_sentry_settings_for(policy)
+    sentry_domain = URI.parse SentryJavascript.dsn
+    additional_setting = "#{sentry_domain.scheme}://#{sentry_domain.host}"
+    existing_settings = policy.connect_src || []
+    all_settings = existing_settings + [additional_setting]
+    policy.connect_src(*all_settings)
   end
 end
 
-def self.apply_sentry_settings_for(policy)
-  sentry_domain = URI.parse SentryJavascript.dsn
-  additional_setting = "#{sentry_domain.scheme}://#{sentry_domain.host}"
-  existing_settings = policy.connect_src || []
-  all_settings = existing_settings + [additional_setting]
-  policy.connect_src(*all_settings)
+Rails.application.configure do
+  config.content_security_policy do |policy|
+    policy.default_src          :none
+    policy.base_uri             :self
+    policy.font_src             :self
+    # Code executions might return a base64 encoded image as a :data URI
+    policy.img_src              :self, :data
+    policy.object_src           :none
+    policy.media_src            :self
+    policy.script_src           :self, :report_sample
+    # Our ACE editor unfortunately requires :unsafe_inline for the code highlighting
+    policy.style_src            :self, :unsafe_inline, :report_sample
+    policy.connect_src          :self
+    # Our ACE editor uses web workers to highlight code, preferably via URL or otherwise with a blob.
+    policy.child_src            :self, :blob
+    policy.form_action          :self
+    policy.frame_ancestors      :none
+
+    # Specify URI for violation reports
+    policy.report_uri           SentryCsp.report_url if SentryCsp.active?
+
+    CSP.apply_yml_settings_for      policy
+    CSP.apply_sentry_settings_for   policy if SentryJavascript.active?
+  end
+
+  # Generate session nonces for permitted importmap and inline scripts
+  # config.content_security_policy_nonce_generator = ->(request) { request.session.id.to_s }
+  # config.content_security_policy_nonce_directives = %w[script-src]
+
+  # Report violations without enforcing the policy
+  # config.content_security_policy_report_only = true
 end
-
-Rails.application.config.content_security_policy do |policy|
-  policy.default_src          :none
-  policy.base_uri             :self
-  policy.font_src             :self
-  # Code executions might return a base64 encoded image as a :data URI
-  policy.img_src              :self, :data
-  policy.object_src           :none
-  policy.media_src            :self
-  policy.script_src           :self, :report_sample
-  # Our ACE editor unfortunately requires :unsafe_inline for the code highlighting
-  policy.style_src            :self, :unsafe_inline, :report_sample
-  policy.connect_src          :self
-  # Our ACE editor uses web workers to highlight code, preferably via URL or otherwise with a blob.
-  policy.child_src            :self, :blob
-  policy.form_action          :self
-  policy.frame_ancestors      :none
-
-  # Specify URI for violation reports
-  policy.report_uri           SentryCsp.report_url if SentryCsp.active?
-
-  apply_yml_settings_for      policy
-  apply_sentry_settings_for   policy if SentryJavascript.active?
-end
-
-# If you are using UJS then enable automatic nonce generation
-# Rails.application.config.content_security_policy_nonce_generator = ->(request) { request.session.id.to_s }
-
-# Set the nonce only to specific directives
-# Rails.application.config.content_security_policy_nonce_directives = %w[script-src]
-
-# Report CSP violations to a specified URI
-# For further information see the following documentation:
-# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
-# Rails.application.config.content_security_policy_report_only = true