fix(codeql): recognize custom admin rate limit middleware

.changeset/codeql-admin-rate-limit-models.md

@@ -0,0 +1,5 @@
+---
+"nostream": patch
+---
+
+fix: teach CodeQL to recognize custom admin rate limit middleware

.github/codeql/codeql-config.yml

@@ -0,0 +1,8 @@
+name: nostream-codeql
+
+packs:
+  javascript-typescript:
+    - cameri/nostream-javascript-models
+
+queries:
+  - uses: security-and-quality

.github/codeql/extensions/nostream-javascript-models/NostreamRateLimitingMiddleware.qll

@@ -0,0 +1,50 @@
+/**
+ * Models Nostream's custom Redis-backed rate limit middleware for CodeQL's
+ * js/missing-rate-limiting query.
+ *
+ * CodeQL only recognizes popular npm rate limiters by default. Nostream uses
+ * in-repo middleware that calls isAdminRateLimited() / isRateLimited().
+ */
+
+import javascript
+import semmle.javascript.security.dataflow.MissingRateLimiting
+
+private predicate isNostreamRateLimitCheck(CallExpr call, string calleeName) {
+  call.getCalleeName() = calleeName
+}
+
+private predicate isInFile(Function fn, string fileSuffix) {
+  fn.getFile().getRelativePath().regexpMatch(".*/" + fileSuffix + "$")
+}
+
+/**
+ * An admin route middleware function that invokes isAdminRateLimited().
+ */
+class NostreamAdminRateLimiterFunction extends DataFlow::FunctionNode {
+  NostreamAdminRateLimiterFunction() {
+    exists(CallExpr call |
+      isNostreamRateLimitCheck(call, "isAdminRateLimited") and
+      call.getEnclosingFunction() = this.getFunction() and
+      isInFile(this.getFunction(), "admin-rate-limit-middleware.ts")
+    )
+  }
+}
+
+/**
+ * A connection-level middleware function that invokes isRateLimited().
+ */
+class NostreamConnectionRateLimiterFunction extends DataFlow::FunctionNode {
+  NostreamConnectionRateLimiterFunction() {
+    exists(CallExpr call |
+      isNostreamRateLimitCheck(call, "isRateLimited") and
+      call.getEnclosingFunction() = this.getFunction() and
+      isInFile(this.getFunction(), "rate-limiter-middleware.ts")
+    )
+  }
+}
+
+class NostreamAdminRateLimitMiddleware extends RateLimitingMiddleware instanceof NostreamAdminRateLimiterFunction {
+}
+
+class NostreamConnectionRateLimitMiddleware extends RateLimitingMiddleware instanceof NostreamConnectionRateLimiterFunction {
+}

.github/codeql/extensions/nostream-javascript-models/codeql-pack.yml

@@ -0,0 +1,5 @@
+name: cameri/nostream-javascript-models
+version: 0.0.1
+library: true
+dependencies:
+  codeql/javascript-all: "*"

.github/workflows/codeql.yml

@@ -85,17 +85,7 @@ jobs:
         with:
           languages: ${{ matrix.language }}
           build-mode: ${{ matrix.build-mode }}
-          # If you wish to specify custom queries, you can do so here or in
-          # a config file. By default, queries listed here will override any
-          # specified in a config file.
-          # Prefix the list here with "+" to use these queries and those in
-          # the config file.
-
-          # For more details on CodeQL's query packs, refer to:
-          # https://docs.github.com/en/code-security/code-scanning/
-          # automatically-scanning-your-code-for-vulnerabilities-and-errors/
-          # configuring-code-scanning#using-queries-in-ql-packs
-          # queries: security-extended,security-and-quality
+          config-file: ./.github/codeql/codeql-config.yml
 
       # If the analyze step fails for one of the languages you are analyzing
       # with "We were unable to automatically build your code", modify the