Add initial Request Blocklist feature configuration (#3990)

Add an initial configuration for the new Request Blocklist feature. Include a
couple of testing rules, for the privacy test page[1]. Also include a
corresponding Tracker Allowlist rule for the test page as well.

The feature is only implemented for the extension so far, so let's enable it
there but leave it disabled for other platforms.

1 - https://privacy-test-pages.site/privacy-protections/request-blocklist/

Author: kzar

features/request-blocklist.json

@@ -0,0 +1,37 @@
+{
+    "_meta": {
+        "description": "Request blocking rules necessary to fix website breakage. Note: Tracker request blocking is handled elsewhere.",
+        "sampleExcludeRecords": {
+            "domain": "example.com",
+            "reason": "site breakage"
+        }
+    },
+    "state": "disabled",
+    "settings": {
+        "blockedRequests": {
+            "privacy-test-pages.site": {
+                "rules": [
+                    {
+                        "rule": "privacy-test-pages.site/privacy-protections/request-blocklist/*?block=true",
+                        "domains": [
+                            "privacy-test-pages.site"
+                        ],
+                        "reason": "Testing rule for the privacy test page, see https://privacy-test-pages.site/privacy-protections/request-blocklist/"
+                    }
+                ]
+            },
+            "third-party.site": {
+                "rules": [
+                    {
+                        "rule": "third-party.site/privacy-protections/request-blocklist/*?block=true",
+                        "domains": [
+                            "privacy-test-pages.site"
+                        ],
+                        "reason": "Testing rule for the privacy test page, see https://privacy-test-pages.site/privacy-protections/request-blocklist/"
+                    }
+                ]
+            }
+        }
+    },
+    "exceptions": []
+}

features/tracker-allowlist.json

@@ -9,6 +9,17 @@
     "state": "enabled",
     "settings": {
         "allowlistedTrackers": {
+            "third-party.site": {
+                "rules": [
+                    {
+                        "rule": "allowlisted.third-party.site",
+                        "domains": [
+                            "privacy-test-pages.site"
+                        ],
+                        "reason": "Testing rule for the privacy test pages"
+                    }
+                ]
+            },
             "2mdn.net": {
                 "rules": [
                     {

overrides/extension-override.json

@@ -208,6 +208,9 @@
                     ]
                 }
             }
+        },
+        "requestBlocklist": {
+            "state": "enabled"
         }
     },
     "unprotectedTemporary": [

schema/config.ts

@@ -23,6 +23,7 @@ import { BurnFeature } from './features/burn';
 import { Taskbar } from './features/taskbar';
 import { AppHealth } from './features/appHealth';
 import { ElementHidingFeature } from './features/element-hiding';
+import { RequestBlocklistFeature } from './features/request-blocklist';
 
 export { WebCompatSettings } from './features/webcompat';
 export { DuckPlayerSettings } from './features/duckplayer';
@@ -70,6 +71,7 @@ export type ConfigV5<VersionType> = {
         windowsWebviewFailures_DDGWV?: WindowsWebViewFailures<VersionType>;
         customUserAgent?: CustomUserAgentFeature<VersionType>;
         elementHiding?: ElementHidingFeature<VersionType>;
+        requestBlocklist?: RequestBlocklistFeature<VersionType>;
     };
     unprotectedTemporary: SiteException[];
 };

schema/features/request-blocklist.ts

@@ -0,0 +1,17 @@
+import { Feature } from '../feature';
+
+type RuleType = {
+    rule: string;
+    domains: string[];
+    reason: string[] | string;
+};
+
+type SettingsType = {
+    blockedRequests: {
+        [domain: string]: {
+            rules: RuleType[];
+        };
+    };
+};
+
+export type RequestBlocklistFeature<VersionType> = Feature<SettingsType, VersionType>;