Model the Faraday HTTP client

ql/lib/codeql/ruby/frameworks/HTTPClients.qll

@@ -4,3 +4,4 @@
 
 private import codeql.ruby.frameworks.http_clients.NetHTTP
 private import codeql.ruby.frameworks.http_clients.Excon
+private import codeql.ruby.frameworks.http_clients.Faraday

ql/lib/codeql/ruby/frameworks/http_clients/Faraday.qll

@@ -0,0 +1,38 @@
+private import ruby
+private import codeql.ruby.Concepts
+private import codeql.ruby.ApiGraphs
+
+/**
+ * A call that makes an HTTP request using `Faraday`.
+ * ```ruby
+ * # one-off request
+ * Faraday.get("http://example.com").body
+ *
+ * # connection re-use
+ * connection = Faraday.new("http://example.com")
+ * connection.get("/").body
+ * ```
+ */
+class FaradayHTTPRequest extends HTTP::Client::Request::Range {
+  DataFlow::Node request;
+  DataFlow::CallNode responseBody;
+
+  FaradayHTTPRequest() {
+    exists(API::Node requestNode |
+      requestNode =
+        [
+          // one-off requests
+          API::getTopLevelMember("Faraday"),
+          // connection re-use
+          API::getTopLevelMember("Faraday").getInstance()
+        ].getReturn(["get", "head", "delete", "post", "put", "patch", "trace"]) and
+      responseBody = requestNode.getAMethodCall("body") and
+      request = requestNode.getAnImmediateUse() and
+      this = request.asExpr().getExpr()
+    )
+  }
+
+  override DataFlow::Node getResponseBody() { result = responseBody }
+
+  override string getFramework() { result = "Faraday" }
+}

ql/test/library-tests/frameworks/http_clients/Faraday.expected

@@ -0,0 +1,9 @@
+| Faraday.rb:3:9:3:42 | call to get | Faraday.rb:4:1:4:10 | call to body |
+| Faraday.rb:6:9:6:62 | call to post | Faraday.rb:7:1:7:10 | call to body |
+| Faraday.rb:9:9:9:61 | call to put | Faraday.rb:10:1:10:10 | call to body |
+| Faraday.rb:12:9:12:63 | call to patch | Faraday.rb:13:1:13:10 | call to body |
+| Faraday.rb:15:9:15:45 | call to delete | Faraday.rb:16:1:16:10 | call to body |
+| Faraday.rb:18:9:18:43 | call to head | Faraday.rb:19:1:19:10 | call to body |
+| Faraday.rb:24:9:24:44 | call to trace | Faraday.rb:25:1:25:10 | call to body |
+| Faraday.rb:28:9:28:27 | call to get | Faraday.rb:29:1:29:10 | call to body |
+| Faraday.rb:31:10:31:46 | call to post | Faraday.rb:32:1:32:11 | call to body |

ql/test/library-tests/frameworks/http_clients/Faraday.ql

@@ -0,0 +1,4 @@
+import codeql.ruby.frameworks.http_clients.Faraday
+import codeql.ruby.DataFlow
+
+query DataFlow::Node faradayHTTPRequests(FaradayHTTPRequest e) { result = e.getResponseBody() }

ql/test/library-tests/frameworks/http_clients/Faraday.rb

@@ -0,0 +1,32 @@
+require "faraday"
+
+resp1 = Faraday.get("http://example.com/")
+resp1.body
+
+resp2 = Faraday.post("http://example.com/", body: "some_data")
+resp2.body
+
+resp3 = Faraday.put("http://example.com/", body: "some_data")
+resp3.body
+
+resp4 = Faraday.patch("http://example.com/", body: "some_data")
+resp4.body
+
+resp5 = Faraday.delete("http://example.com/")
+resp5.body
+
+resp6 = Faraday.head("http://example.com/")
+resp6.body
+
+resp7 = Faraday.options("http://example.com/")
+resp7.body
+
+resp8 = Faraday.trace("http://example.com/")
+resp8.body
+
+connection = Faraday.new("http://example.com")
+resp9 = connection.get("/")
+resp9.body
+
+resp10 = connection.post("/foo", some: "data")
+resp10.body