Java: Add VS Code model editor queries

java/ql/lib/semmle/code/java/dataflow/internal/ModelExclusions.qll

@@ -25,7 +25,7 @@ class TestLibrary extends RefType {
 }
 
 /** Holds if the given file is a test file. */
-private predicate isInTestFile(File file) {
+predicate isInTestFile(File file) {
   file.getAbsolutePath().matches(["%/test/%", "%/guava-tests/%", "%/guava-testlib/%"]) and
   not file.getAbsolutePath().matches(["%/ql/test/%", "%/ql/automodel/test/%"]) // allows our test cases to work
 }

java/ql/src/utils/modeleditor/AutomodelVsCode.qll

@@ -0,0 +1,139 @@
+/** Provides classes and predicates related to handling APIs for the VS Code extension. */
+
+private import java
+private import semmle.code.java.dataflow.DataFlow
+private import semmle.code.java.dataflow.ExternalFlow
+private import semmle.code.java.dataflow.FlowSources
+private import semmle.code.java.dataflow.FlowSummary
+private import semmle.code.java.dataflow.internal.DataFlowPrivate
+private import semmle.code.java.dataflow.internal.FlowSummaryImpl as FlowSummaryImpl
+private import semmle.code.java.dataflow.TaintTracking
+private import semmle.code.java.dataflow.internal.ModelExclusions
+
+/** Holds if the given callable/method is not worth supporting. */
+private predicate isUninteresting(Callable c) {
+  c.getDeclaringType() instanceof TestLibrary or
+  c.(Constructor).isParameterless() or
+  c.getDeclaringType() instanceof AnonymousClass
+}
+
+/**
+ * A callable method from either the Standard Library, a 3rd party library or from the source.
+ */
+class CallableMethod extends Callable {
+  CallableMethod() { not isUninteresting(this) }
+
+  /**
+   * Gets information about the external API in the form expected by the MaD modeling framework.
+   */
+  string getApiName() {
+    result =
+      this.getDeclaringType().getPackage() + "." + this.getDeclaringType().nestedName() + "#" +
+        this.getName() + paramsString(this)
+  }
+
+  private string getJarName() {
+    result = this.getCompilationUnit().getParentContainer*().(JarFile).getBaseName()
+  }
+
+  private string getJarVersion() {
+    result = this.getCompilationUnit().getParentContainer*().(JarFile).getSpecificationVersion()
+  }
+
+  /**
+   * Gets the jar file containing this API. Normalizes the Java Runtime to "rt.jar" despite the presence of modules.
+   */
+  string jarContainer() {
+    result = this.getJarName()
+    or
+    not exists(this.getJarName()) and result = "rt.jar"
+  }
+
+  /**
+   * Gets the version of the JAR file containing this API. Empty if no version is found in the JAR.
+   */
+  string jarVersion() {
+    result = this.getJarVersion()
+    or
+    not exists(this.getJarVersion()) and result = ""
+  }
+
+  /** Gets a node that is an input to a call to this API. */
+  private DataFlow::Node getAnInput() {
+    exists(Call call | call.getCallee().getSourceDeclaration() = this |
+      result.asExpr().(Argument).getCall() = call or
+      result.(ArgumentNode).getCall().asCall() = call
+    )
+  }
+
+  /** Gets a node that is an output from a call to this API. */
+  private DataFlow::Node getAnOutput() {
+    exists(Call call | call.getCallee().getSourceDeclaration() = this |
+      result.asExpr() = call or
+      result.(DataFlow::PostUpdateNode).getPreUpdateNode().(ArgumentNode).getCall().asCall() = call
+    )
+  }
+
+  /** Holds if this API has a supported summary. */
+  pragma[nomagic]
+  predicate hasSummary() {
+    this = any(SummarizedCallable sc).asCallable() or
+    TaintTracking::localAdditionalTaintStep(this.getAnInput(), _)
+  }
+
+  pragma[nomagic]
+  predicate isSource() {
+    this.getAnOutput() instanceof RemoteFlowSource or sourceNode(this.getAnOutput(), _)
+  }
+
+  /** Holds if this API is a known sink. */
+  pragma[nomagic]
+  predicate isSink() { sinkNode(this.getAnInput(), _) }
+
+  /** Holds if this API is a known neutral. */
+  pragma[nomagic]
+  predicate isNeutral() {
+    exists(
+      string namespace, string type, string name, string signature, string kind, string provenance
+    |
+      neutralModel(namespace, type, name, signature, kind, provenance) and
+      this = interpretElement(namespace, type, false, name, signature, "")
+    )
+  }
+
+  /**
+   * Holds if this API is supported by existing CodeQL libraries, that is, it is either a
+   * recognized source, sink or neutral or it has a flow summary.
+   */
+  predicate isSupported() {
+    this.hasSummary() or this.isSource() or this.isSink() or this.isNeutral()
+  }
+}
+
+boolean isSupported(CallableMethod method) {
+  method.isSupported() and result = true
+  or
+  not method.isSupported() and result = false
+}
+
+string supportedType(CallableMethod method) {
+  method.isSink() and result = "sink"
+  or
+  method.isSource() and result = "source"
+  or
+  method.hasSummary() and result = "summary"
+  or
+  method.isNeutral() and result = "neutral"
+  or
+  not method.isSupported() and result = ""
+}
+
+string methodClassification(Call method) {
+  isInTestFile(method.getLocation().getFile()) and result = "test"
+  or
+  method.getFile() instanceof GeneratedFile and result = "generated"
+  or
+  not isInTestFile(method.getLocation().getFile()) and
+  not method.getFile() instanceof GeneratedFile and
+  result = "source"
+}

java/ql/src/utils/modeleditor/FetchApplicationModeMethods.ql

@@ -0,0 +1,29 @@
+/**
+ * @name Fetch model editor methods (application mode)
+ * @description A list of 3rd party APIs used in the codebase. Excludes test and generated code.
+ * @kind problem
+ * @problem.severity recommendation
+ * @id java/utils/modeleditor/fetch-application-mode-methods
+ * @tags modeleditor fetch methods application-mode
+ */
+
+private import java
+private import AutomodelVsCode
+
+class ExternalApi extends CallableMethod {
+  ExternalApi() { not this.fromSource() }
+}
+
+private Call aUsage(ExternalApi api) { result.getCallee().getSourceDeclaration() = api }
+
+from
+  ExternalApi externalApi, string apiName, boolean supported, Call usage, string type,
+  string classification
+where
+  apiName = externalApi.getApiName() and
+  supported = isSupported(externalApi) and
+  usage = aUsage(externalApi) and
+  type = supportedType(externalApi) and
+  classification = methodClassification(usage)
+select usage, apiName, supported.toString(), "supported", externalApi.jarContainer(),
+  externalApi.jarVersion(), type, "type", classification, "classification"

java/ql/src/utils/modeleditor/FetchFrameworkModeMethods.ql

@@ -0,0 +1,23 @@
+/**
+ * @name Fetch model editor methods (framework mode)
+ * @description A list of APIs callable by consumers. Excludes test and generated code.
+ * @kind problem
+ * @problem.severity recommendation
+ * @id java/utils/modeleditor/fetch-framework-mode-methods
+ * @tags modeleditor fetch methods framework-mode
+ */
+
+private import java
+private import semmle.code.java.dataflow.internal.ModelExclusions
+private import AutomodelVsCode
+
+class PublicMethodFromSource extends CallableMethod, ModelApi { }
+
+from PublicMethodFromSource publicMethod, string apiName, boolean supported, string type
+where
+  apiName = publicMethod.getApiName() and
+  supported = isSupported(publicMethod) and
+  type = supportedType(publicMethod)
+select publicMethod, apiName, supported.toString(), "supported",
+  publicMethod.getCompilationUnit().getParentContainer().getBaseName(), "library", type, "type",
+  "unknown", "classification"

java/ql/test/utils/modeleditor/FetchApplicationModeMethods.expected

@@ -0,0 +1,8 @@
+| com/github/codeql/test/NonPublicClass.java:5:5:5:28 | println(...) | java.io.PrintStream#println(String) | true | supported | rt.jar |  | sink | type | source | classification |
+| com/github/codeql/test/PublicClass.java:7:5:7:27 | println(...) | java.io.PrintStream#println(String) | true | supported | rt.jar |  | sink | type | source | classification |
+| com/github/codeql/test/PublicClass.java:11:5:11:27 | println(...) | java.io.PrintStream#println(String) | true | supported | rt.jar |  | sink | type | source | classification |
+| com/github/codeql/test/PublicClass.java:15:5:15:45 | println(...) | java.io.PrintStream#println(Object) | true | supported | rt.jar |  | sink | type | source | classification |
+| com/github/codeql/test/PublicClass.java:15:24:15:44 | get(...) | java.nio.file.Paths#get(String,String[]) | true | supported | rt.jar |  | sink | type | source | classification |
+| com/github/codeql/test/PublicClass.java:15:24:15:44 | get(...) | java.nio.file.Paths#get(String,String[]) | true | supported | rt.jar |  | summary | type | source | classification |
+| com/github/codeql/test/PublicClass.java:19:5:19:27 | println(...) | java.io.PrintStream#println(String) | true | supported | rt.jar |  | sink | type | source | classification |
+| com/github/codeql/test/PublicInterface.java:7:7:7:29 | println(...) | java.io.PrintStream#println(String) | true | supported | rt.jar |  | sink | type | source | classification |

java/ql/test/utils/modeleditor/FetchApplicationModeMethods.qlref

@@ -0,0 +1 @@
+utils/modeleditor/FetchApplicationModeMethods.ql

java/ql/test/utils/modeleditor/FetchFrameworkModeMethods.expected

@@ -0,0 +1,5 @@
+| com/github/codeql/test/PublicClass.java:6:15:6:19 | stuff | com.github.codeql.test.PublicClass#stuff(String) | false | supported | test | library |  | type | unknown | classification |
+| com/github/codeql/test/PublicClass.java:10:22:10:32 | staticStuff | com.github.codeql.test.PublicClass#staticStuff(String) | false | supported | test | library |  | type | unknown | classification |
+| com/github/codeql/test/PublicClass.java:14:18:14:31 | nonPublicStuff | com.github.codeql.test.PublicClass#nonPublicStuff(String) | false | supported | test | library |  | type | unknown | classification |
+| com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | com.github.codeql.test.PublicInterface#stuff(String) | false | supported | test | library |  | type | unknown | classification |
+| com/github/codeql/test/PublicInterface.java:6:24:6:34 | staticStuff | com.github.codeql.test.PublicInterface#staticStuff(String) | false | supported | test | library |  | type | unknown | classification |

java/ql/test/utils/modeleditor/FetchFrameworkModeMethods.qlref

@@ -0,0 +1 @@
+utils/modeleditor/FetchFrameworkModeMethods.ql

java/ql/test/utils/modeleditor/com/github/codeql/test/NonPublicClass.java

@@ -0,0 +1,7 @@
+package com.github.codeql.test;
+
+class NonPublicClass {
+  public void noCandidates(String here) {
+    System.out.println(here);
+  }
+}

java/ql/test/utils/modeleditor/com/github/codeql/test/PublicClass.java

@@ -0,0 +1,21 @@
+package com.github.codeql.test;
+
+import java.nio.file.Paths;
+
+public class PublicClass {
+  public void stuff(String arg) {
+    System.out.println(arg);
+  }
+
+  public static void staticStuff(String arg) {
+    System.out.println(arg);
+  }
+
+  protected void nonPublicStuff(String arg) {
+    System.out.println(Paths.get("foo", arg));
+  }
+
+  void packagePrivateStuff(String arg) {
+    System.out.println(arg);
+  }
+}

java/ql/test/utils/modeleditor/com/github/codeql/test/PublicInterface.java

@@ -0,0 +1,9 @@
+package com.github.codeql.test;
+
+public interface PublicInterface {
+    public void stuff(String arg);
+
+    public static void staticStuff(String arg) {
+      System.out.println(arg);
+    }
+}