com.google.javascript.jscomp.ConformanceRules Maven / Gradle / Ivy
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/*
* Copyright 2014 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Ascii;
import com.google.common.base.Joiner;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSetMultimap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import com.google.common.reflect.TypeToken;
import com.google.javascript.jscomp.CheckConformance.InvalidRequirementSpec;
import com.google.javascript.jscomp.CheckConformance.Precondition;
import com.google.javascript.jscomp.CheckConformance.Rule;
import com.google.javascript.jscomp.CodingConvention.AssertionFunctionLookup;
import com.google.javascript.jscomp.Requirement.Severity;
import com.google.javascript.jscomp.parsing.JsDocInfoParser;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.QualifiedName;
import com.google.javascript.rhino.Token;
import com.google.javascript.rhino.jstype.EnumElementType;
import com.google.javascript.rhino.jstype.FunctionType;
import com.google.javascript.rhino.jstype.JSType;
import com.google.javascript.rhino.jstype.JSTypeNative;
import com.google.javascript.rhino.jstype.JSTypeRegistry;
import com.google.javascript.rhino.jstype.ObjectType;
import com.google.javascript.rhino.jstype.Property;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import javax.annotation.Nullable;
/**
* Standard conformance rules. See
* third_party/java_src/jscomp/java/com/google/javascript/jscomp/conformance.proto
*/
@GwtIncompatible("java.lang.reflect, java.util.regex")
public final class ConformanceRules {
private static final AllowList ALL_TS_ALLOWLIST = createTsAllowlist();
private static AllowList createTsAllowlist() {
try {
return new AllowList(ImmutableList.of(), ImmutableList.of(".*\\.closure\\.js"));
} catch (Throwable t) {
throw new AssertionError(t);
}
}
private ConformanceRules() {}
/**
* Classes extending AbstractRule must return ConformanceResult from their checkConformance
* implementation. For simple rules, the constants CONFORMANCE, POSSIBLE_VIOLATION, VIOLATION are
* sufficient. However, for some rules additional clarification specific to the violation instance
* is helpful, for that, an instance of this class can be created to associate a note with the
* violation.
*/
public static class ConformanceResult {
ConformanceResult(ConformanceLevel level) {
this(level, "");
}
ConformanceResult(ConformanceLevel level, String note) {
this.level = level;
this.note = note;
}
public final ConformanceLevel level;
public final String note;
// For CONFORMANCE rules that don't generate notes:
public static final ConformanceResult CONFORMANCE =
new ConformanceResult(ConformanceLevel.CONFORMANCE);
public static final ConformanceResult POSSIBLE_VIOLATION =
new ConformanceResult(ConformanceLevel.POSSIBLE_VIOLATION);
private static final ConformanceResult POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES =
new ConformanceResult(
ConformanceLevel.POSSIBLE_VIOLATION,
"The type information available for this expression is too loose "
+ "to ensure conformance.");
public static final ConformanceResult VIOLATION =
new ConformanceResult(ConformanceLevel.VIOLATION);
}
/** Possible check check results */
public static enum ConformanceLevel {
// Nothing interesting detected.
CONFORMANCE,
// In the optionally typed world of the Closure Compiler type system
// it is possible that detect patterns that match with looser types
// that the target pattern.
POSSIBLE_VIOLATION,
// Definitely a violation.
VIOLATION,
}
@Nullable
private static Pattern buildPattern(List reqPatterns) throws InvalidRequirementSpec {
if (reqPatterns == null || reqPatterns.isEmpty()) {
return null;
}
// validate the patterns
for (String reqPattern : reqPatterns) {
try {
Pattern.compile(reqPattern);
} catch (PatternSyntaxException e) {
throw new InvalidRequirementSpec("invalid regex pattern", e);
}
}
Pattern pattern = null;
try {
String jointRegExp = "(" + Joiner.on("|").join(reqPatterns) + ")";
pattern = Pattern.compile(jointRegExp);
} catch (PatternSyntaxException e) {
throw new RuntimeException("bad joined regexp", e);
}
return pattern;
}
private static class AllowList {
@Nullable final ImmutableList prefixes;
@Nullable final Pattern regexp;
@Nullable final Requirement.WhitelistEntry allowlistEntry;
AllowList(List prefixes, List regexps) throws InvalidRequirementSpec {
this.prefixes = ImmutableList.copyOf(prefixes);
this.regexp = buildPattern(regexps);
this.allowlistEntry = null;
}
AllowList(Requirement.WhitelistEntry allowlistEntry) throws InvalidRequirementSpec {
this.prefixes = ImmutableList.copyOf(allowlistEntry.getPrefixList());
this.regexp = buildPattern(allowlistEntry.getRegexpList());
this.allowlistEntry = allowlistEntry;
}
/**
* Returns true if the given path matches one of the prefixes or regexps, and false otherwise
*/
boolean matches(String path) {
// If the path ends with .closure.js, it is probably a tsickle-generated file, and there may
// be entries in the allow list for the TypeScript path
String tsPath =
path.endsWith(".closure.js")
? path.substring(0, path.length() - ".closure.js".length()) + ".ts"
: null;
if (prefixes != null) {
for (String prefix : prefixes) {
if (!path.isEmpty()
&& (path.startsWith(prefix) || (tsPath != null && tsPath.startsWith(prefix)))) {
return true;
}
}
}
return regexp != null
&& (regexp.matcher(path).find() || (tsPath != null && regexp.matcher(tsPath).find()));
}
}
/**
* A conformance rule implementation to support things common to all rules such as allowlisting
* and reporting.
*/
public abstract static class AbstractRule implements Rule {
final AbstractCompiler compiler;
final String message;
final Severity severity;
final ImmutableList allowlists;
@Nullable final AllowList onlyApplyTo;
final boolean reportLooseTypeViolations;
final TypeMatchingStrategy typeMatchingStrategy;
final Requirement requirement;
public AbstractRule(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
if (!requirement.hasErrorMessage()) {
throw new InvalidRequirementSpec("missing message");
}
this.compiler = compiler;
String message = requirement.getErrorMessage();
if (requirement.getConfigFileCount() > 0) {
message +=
"\n defined in " + Joiner.on("\n extended by ").join(requirement.getConfigFileList());
}
this.message = message;
if (requirement.getSeverity() == Severity.UNSPECIFIED) {
severity = Severity.WARNING;
} else {
severity = requirement.getSeverity();
}
// build allowlists
ImmutableList.Builder allowlistsBuilder = new ImmutableList.Builder<>();
for (Requirement.WhitelistEntry entry : requirement.getWhitelistEntryList()) {
allowlistsBuilder.add(new AllowList(entry));
}
for (Requirement.WhitelistEntry entry : requirement.getAllowlistEntryList()) {
allowlistsBuilder.add(new AllowList(entry));
}
if (this.tsIsAllowlisted()) {
allowlistsBuilder.add(ALL_TS_ALLOWLIST);
}
if (requirement.getWhitelistCount() > 0 || requirement.getWhitelistRegexpCount() > 0) {
AllowList allowlist =
new AllowList(requirement.getWhitelistList(), requirement.getWhitelistRegexpList());
allowlistsBuilder.add(allowlist);
}
if (requirement.getAllowlistCount() > 0 || requirement.getAllowlistRegexpCount() > 0) {
AllowList allowlist =
new AllowList(requirement.getAllowlistList(), requirement.getAllowlistRegexpList());
allowlistsBuilder.add(allowlist);
}
allowlists = allowlistsBuilder.build();
if (requirement.getOnlyApplyToCount() > 0 || requirement.getOnlyApplyToRegexpCount() > 0) {
onlyApplyTo =
new AllowList(requirement.getOnlyApplyToList(), requirement.getOnlyApplyToRegexpList());
} else {
onlyApplyTo = null;
}
reportLooseTypeViolations = requirement.getReportLooseTypeViolations();
typeMatchingStrategy = getTypeMatchingStrategy(requirement);
this.requirement = requirement;
}
protected boolean tsIsAllowlisted() {
return false;
}
private static TypeMatchingStrategy getTypeMatchingStrategy(Requirement requirement) {
switch (requirement.getTypeMatchingStrategy()) {
case LOOSE:
return TypeMatchingStrategy.LOOSE;
case STRICT_NULLABILITY:
return TypeMatchingStrategy.STRICT_NULLABILITY;
case SUBTYPES:
return TypeMatchingStrategy.SUBTYPES;
case EXACT:
return TypeMatchingStrategy.EXACT;
default:
throw new IllegalStateException("Unknown TypeMatchingStrategy");
}
}
/**
* @return Whether the code represented by the Node conforms to the rule.
*/
protected abstract ConformanceResult checkConformance(NodeTraversal t, Node n);
/** Returns the first AllowList entry that matches the given path, and null otherwise. */
@Nullable
private AllowList findAllowListForPath(String path) {
Optional pathRegex = compiler.getOptions().getConformanceRemoveRegexFromPath();
if (pathRegex.isPresent()) {
path = pathRegex.get().matcher(path).replaceFirst("");
}
for (AllowList allowlist : allowlists) {
if (allowlist.matches(path)) {
return allowlist;
}
}
return null;
}
@Override
public final void check(NodeTraversal t, Node n) {
ConformanceResult result = checkConformance(t, n);
if (result.level != ConformanceLevel.CONFORMANCE) {
report(n, result);
}
}
/**
* Report a conformance warning for the given node.
*
* @param n The node representing the violating code.
* @param result The result representing the confidence of the violation.
*/
protected void report(Node n, ConformanceResult result) {
DiagnosticType msg;
if (severity == Severity.ERROR) {
// Always report findings that are errors, even if the types are too loose to be certain.
// TODO(bangert): If this causes problems, add another severity category that only
// errors when certain.
msg = CheckConformance.CONFORMANCE_ERROR;
} else {
if (result.level == ConformanceLevel.VIOLATION) {
msg = CheckConformance.CONFORMANCE_VIOLATION;
} else {
msg = CheckConformance.CONFORMANCE_POSSIBLE_VIOLATION;
}
}
String separator = (result.note.isEmpty()) ? "" : "\n";
JSError err = JSError.make(n, msg, message, separator, result.note);
String path = NodeUtil.getSourceName(n);
AllowList allowlist = path != null ? findAllowListForPath(path) : null;
boolean shouldReport =
compiler
.getErrorManager()
.shouldReportConformanceViolation(
requirement,
allowlist != null
? Optional.fromNullable(allowlist.allowlistEntry)
: Optional.absent(),
err);
if (shouldReport && allowlist == null && (onlyApplyTo == null || onlyApplyTo.matches(path))) {
compiler.report(err);
}
}
}
/**
* No-op rule that never reports any violations.
*
* This exists so that, if a requirement becomes obsolete but is extended by other requirements
* that can't all be simultaneously deleted, it can be changed to this rule, allowing it to be
* effectively removed without breaking downstream builds.
*/
static final class NoOp extends AbstractRule {
NoOp(AbstractCompiler compiler, Requirement requirement) throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
return ConformanceResult.CONFORMANCE;
}
}
abstract static class AbstractTypeRestrictionRule extends AbstractRule {
private final JSType nativeObjectType;
private final JSType allowlistedTypes;
private final AssertionFunctionLookup assertionFunctions;
public AbstractTypeRestrictionRule(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
nativeObjectType = compiler.getTypeRegistry().getNativeType(JSTypeNative.OBJECT_TYPE);
List allowlistedTypeNames = requirement.getValueList();
allowlistedTypes = union(allowlistedTypeNames);
assertionFunctions =
AssertionFunctionLookup.of(compiler.getCodingConvention().getAssertionFunctions());
}
protected boolean isAllowlistedType(Node n) {
if (allowlistedTypes != null && n.getJSType() != null) {
JSType targetType = n.getJSType().restrictByNotNullOrUndefined();
if (targetType.isSubtypeOf(allowlistedTypes)) {
return true;
}
}
return false;
}
protected static boolean isKnown(Node n) {
return !isUnknown(n)
&& !isBottom(n)
&& !isTemplateType(n); // TODO(johnlenz): Remove this restriction
}
protected boolean isNativeObjectType(Node n) {
JSType type = n.getJSType().restrictByNotNullOrUndefined();
return type.equals(nativeObjectType);
}
protected static boolean isTop(Node n) {
JSType type = n.getJSType();
return type != null && type.isAllType();
}
protected static boolean isUnknown(Node n) {
JSType type = n.getJSType();
return (type == null || type.isUnknownType());
}
protected static boolean isTemplateType(Node n) {
JSType type = n.getJSType();
if (type.isUnionType()) {
for (JSType member : type.getUnionMembers()) {
if (member.isTemplateType()) {
return true;
}
}
}
return type.isTemplateType();
}
private static boolean isBottom(Node n) {
JSType type = n.getJSType().restrictByNotNullOrUndefined();
return type.isEmptyType();
}
protected JSType union(List typeNames) {
JSTypeRegistry registry = compiler.getTypeRegistry();
List types = new ArrayList<>();
for (String typeName : typeNames) {
JSType type = registry.getGlobalType(typeName);
if (type != null) {
types.add(type);
}
}
if (types.isEmpty()) {
return null;
} else {
return registry.createUnionType(types);
}
}
protected boolean isAssertionCall(Node n) {
if (n.isCall() && n.getFirstChild().isQualifiedName()) {
Node target = n.getFirstChild();
return assertionFunctions.lookupByCallee(target) != null;
}
return false;
}
protected boolean isTypeImmediatelyTightened(Node n) {
return isAssertionCall(n.getParent())
|| n.getParent().isTypeOf()
|| /* casted node */ n.getJSTypeBeforeCast() != null;
}
protected boolean isUsed(Node n) {
if (n.getParent().isName() || NodeUtil.isLhsByDestructuring(n)) {
return false;
}
// Consider lvalues in assignment operations to be used iff the actual assignment
// operation's result is used. e.g. for `a.b.c`:
// USED: `alert(x = a.b.c);`
// UNUSED: `x = a.b.c;`
if (NodeUtil.isAssignmentOp(n.getParent())) {
return NodeUtil.isExpressionResultUsed(n.getParent());
}
return NodeUtil.isExpressionResultUsed(n);
}
}
/**
* Check that variables annotated as @const have an inferred type, if there is no type given
* explicitly.
*/
static class InferredConstCheck extends AbstractRule {
public InferredConstCheck(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
JSDocInfo jsDoc = n.getJSDocInfo();
if (jsDoc != null && jsDoc.hasConstAnnotation() && jsDoc.getType() == null) {
if (n.isAssign()) {
n = n.getFirstChild();
}
JSType type = n.getJSType();
if (type != null && type.isUnknownType() && !NodeUtil.isNamespaceDecl(n)) {
return ConformanceResult.VIOLATION;
}
}
return ConformanceResult.CONFORMANCE;
}
}
/** Banned dependency rule */
static class BannedDependency extends AbstractRule {
private final List paths;
BannedDependency(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
paths = requirement.getValueList();
if (paths.isEmpty()) {
throw new InvalidRequirementSpec("missing value");
}
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isScript()) {
String srcFile = n.getSourceFileName();
for (int i = 0; i < paths.size(); i++) {
String path = paths.get(i);
if (srcFile.startsWith(path)) {
return ConformanceResult.VIOLATION;
}
}
}
return ConformanceResult.CONFORMANCE;
}
}
/** Banned dependency via regex rule */
static class BannedDependencyRegex extends AbstractRule {
@Nullable private final Pattern pathRegexp;
BannedDependencyRegex(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
List pathRegexpList = requirement.getValueList();
if (pathRegexpList.isEmpty()) {
throw new InvalidRequirementSpec("missing value (no banned dependency regexps)");
}
pathRegexp = buildPattern(pathRegexpList);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isScript()) {
String srcFile = n.getSourceFileName();
if (pathRegexp != null && pathRegexp.matcher(srcFile).find()) {
return ConformanceResult.VIOLATION;
}
}
return ConformanceResult.CONFORMANCE;
}
}
/** Banned name rule */
static final class BannedName extends AbstractRule {
private final Requirement.Type requirementType;
private final ImmutableList qualifiedNames;
private final ImmutableSet shortNames;
BannedName(AbstractCompiler compiler, Requirement requirement) throws InvalidRequirementSpec {
super(compiler, requirement);
if (requirement.getValueCount() == 0) {
throw new InvalidRequirementSpec("missing value");
}
this.requirementType = requirement.getType();
ImmutableList.Builder qualifiedBuilder = ImmutableList.builder();
ImmutableSet.Builder shortBuilder = ImmutableSet.builder();
for (String name : requirement.getValueList()) {
Node qualifiedName = NodeUtil.newQName(compiler, name);
qualifiedBuilder.add(qualifiedName);
shortBuilder.add(qualifiedName.getString());
}
this.qualifiedNames = qualifiedBuilder.build();
this.shortNames = shortBuilder.build();
}
private static final Precondition IS_CANDIDATE_NODE =
new Precondition() {
@Override
public boolean shouldCheck(Node n) {
switch (n.getToken()) {
case GETPROP:
return n.getFirstChild().isQualifiedName();
case NAME:
return !n.getString().isEmpty();
default:
return false;
}
}
};
@Override
public final Precondition getPrecondition() {
return IS_CANDIDATE_NODE;
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (requirementType == Requirement.Type.BANNED_NAME_CALL
&& !ConformanceUtil.isCallTarget(n)) {
return ConformanceResult.CONFORMANCE;
}
/**
* Efficiently filter out nearly all candidates.
*
* Ideally we could use a hashset containing the qualified names, but it turns out that
* creating wrapper a object for every Node is more expensive than the loop below.
*/
if (!this.shortNames.contains(n.getString())) {
return ConformanceResult.CONFORMANCE;
}
/**
* Defer expensive infrequent checks.
*
*
These could be a precondition, but they don't usually need to be checked. Since they're
* kind of expensive, it's cheaper overall to defer them.
*/
if (NodeUtil.isInSyntheticScript(n) || !isRootOfQualifiedNameGlobal(t, n)) {
return ConformanceResult.CONFORMANCE;
}
for (int i = this.qualifiedNames.size() - 1; i >= 0; i--) {
if (n.matchesQualifiedName(this.qualifiedNames.get(i))) {
return ConformanceResult.VIOLATION;
}
}
return ConformanceResult.CONFORMANCE;
}
private static boolean isRootOfQualifiedNameGlobal(NodeTraversal t, Node n) {
String rootName = NodeUtil.getRootOfQualifiedName(n).getQualifiedName();
Var v = checkNotNull(t.getScope().getVar(rootName), "Missing var for %s", rootName);
return v.isGlobal();
}
}
/** Banned property rule */
static final class BannedProperty extends AbstractRule {
private enum RequirementPrecondition implements Precondition {
BANNED_PROPERTY() {
@Override
public boolean shouldCheck(Node n) {
switch (n.getToken()) {
case STRING_KEY:
case GETPROP:
case GETELEM:
case COMPUTED_PROP:
return true;
default:
return false;
}
}
},
BANNED_PROPERTY_WRITE() {
@Override
public boolean shouldCheck(Node n) {
return NodeUtil.isLValue(n);
}
},
BANNED_PROPERTY_NON_CONSTANT_WRITE() {
@Override
public boolean shouldCheck(Node n) {
if (!NodeUtil.isLValue(n)) {
return false;
}
if (NodeUtil.isLhsOfAssign(n)
&& (NodeUtil.isLiteralValue(n.getNext(), false /* includeFunctions */)
|| NodeUtil.isSomeCompileTimeConstStringValue(n.getNext()))) {
return false;
}
return true;
}
},
BANNED_PROPERTY_READ() {
@Override
public boolean shouldCheck(Node n) {
return !NodeUtil.isLValue(n) && NodeUtil.isExpressionResultUsed(n);
}
},
BANNED_PROPERTY_CALL() {
@Override
public boolean shouldCheck(Node n) {
return ConformanceUtil.isCallTarget(n);
}
},
}
private final JSTypeRegistry registry;
private final ImmutableSetMultimap props;
private final RequirementPrecondition requirementPrecondition;
BannedProperty(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
if (requirement.getValueCount() == 0) {
throw new InvalidRequirementSpec("missing value");
}
switch (requirement.getType()) {
case BANNED_PROPERTY:
this.requirementPrecondition = RequirementPrecondition.BANNED_PROPERTY;
break;
case BANNED_PROPERTY_READ:
this.requirementPrecondition = RequirementPrecondition.BANNED_PROPERTY_READ;
break;
case BANNED_PROPERTY_WRITE:
this.requirementPrecondition = RequirementPrecondition.BANNED_PROPERTY_WRITE;
break;
case BANNED_PROPERTY_NON_CONSTANT_WRITE:
this.requirementPrecondition = RequirementPrecondition.BANNED_PROPERTY_NON_CONSTANT_WRITE;
break;
case BANNED_PROPERTY_CALL:
this.requirementPrecondition = RequirementPrecondition.BANNED_PROPERTY_CALL;
break;
default:
throw new AssertionError(requirement.getType());
}
this.registry = compiler.getTypeRegistry();
ImmutableSetMultimap.Builder builder = ImmutableSetMultimap.builder();
for (String value : requirement.getValueList()) {
String typename = ConformanceUtil.getClassFromDeclarationName(value);
String property = ConformanceUtil.getPropertyFromDeclarationName(value);
if (typename == null || property == null) {
throw new InvalidRequirementSpec("bad prop value");
}
JSType type = registry.getGlobalType(typename);
if (type == null) {
type = registry.resolveViaClosureNamespace(typename);
}
// If type doesn't exist in the copmilation, it can't be a violation. Also, bottom types
// match everything, which is almost surely not what the check is intended to check against.
if (type == null || type.isUnknownType() || type.isEmptyType()) {
continue;
}
builder.put(property, type);
}
this.props = builder.build();
}
@Override
public final Precondition getPrecondition() {
return this.requirementPrecondition;
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
ImmutableSet checkTypes = this.props.get(this.extractName(n));
if (checkTypes.isEmpty()) {
return ConformanceResult.CONFORMANCE;
}
/**
* Avoid type operations when possible.
*
* checkTypes is almost always empty, and operations on unions can be expensive.
*/
JSType foundType = this.extractType(n);
if (foundType == null) {
return ConformanceResult.CONFORMANCE;
}
foundType = foundType.restrictByNotNullOrUndefined();
for (JSType checkType : checkTypes) {
ConformanceResult result = this.matchTypes(foundType, checkType);
if (result.level != ConformanceLevel.CONFORMANCE) {
return result;
}
}
return ConformanceResult.CONFORMANCE;
}
private ConformanceResult matchTypes(JSType foundType, JSType checkType) {
ObjectType foundObj = foundType.toMaybeObjectType();
if (foundObj != null) {
if (foundObj.isFunctionPrototypeType()) {
FunctionType ownerFun = foundObj.getOwnerFunction();
if (ownerFun.isConstructor()) {
foundType = ownerFun.getInstanceType();
}
} else if (foundObj.isTemplatizedType()) {
foundType = foundObj.getRawType();
}
}
if (foundType.isUnknownType()
|| foundType.isTemplateType()
|| foundType.isEmptyType()
|| foundType.isAllType()
|| foundType.equals(this.registry.getNativeType(JSTypeNative.OBJECT_TYPE))) {
if (reportLooseTypeViolations) {
return ConformanceResult.POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES;
}
} else if (foundType.isSubtypeOf(checkType)) {
return ConformanceResult.VIOLATION;
} else if (checkType.isSubtypeWithoutStructuralTyping(foundType)) {
if (matchesPrototype(checkType, foundType)) {
return ConformanceResult.VIOLATION;
} else if (reportLooseTypeViolations) {
// Access of a banned property through a super class may be a violation
return ConformanceResult.POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES;
}
}
return ConformanceResult.CONFORMANCE;
}
private boolean matchesPrototype(JSType type, JSType maybePrototype) {
ObjectType methodClassObjectType = type.toMaybeObjectType();
if (methodClassObjectType != null) {
if (methodClassObjectType.getImplicitPrototype().equals(maybePrototype)) {
return true;
}
}
return false;
}
private JSType extractType(Node n) {
switch (n.getToken()) {
case GETELEM:
case GETPROP:
return n.getFirstChild().getJSType();
case STRING_KEY:
case COMPUTED_PROP:
{
Node parent = n.getParent();
switch (parent.getToken()) {
case OBJECT_PATTERN:
case OBJECTLIT:
return parent.getJSType();
case CLASS_MEMBERS:
return null;
default:
throw new AssertionError();
}
}
default:
return null;
}
}
private String extractName(Node n) {
switch (n.getToken()) {
case GETPROP:
case STRING_KEY:
return n.getString();
case GETELEM:
{
Node string = n.getSecondChild();
return string.isStringLit() ? string.getString() : null;
}
case COMPUTED_PROP:
{
Node string = n.getFirstChild();
return string.isStringLit() ? string.getString() : null;
}
default:
return null;
}
}
}
private static class ConformanceUtil {
static boolean isCallTarget(Node n) {
Node parent = n.getParent();
return (parent.isCall() || parent.isNew()) && parent.getFirstChild() == n;
}
static boolean isLooseType(JSType type) {
return type.isUnknownType() || type.isNoResolvedType() || type.isAllType();
}
static JSType evaluateTypeString(AbstractCompiler compiler, String expression)
throws InvalidRequirementSpec {
Node typeNodes = JsDocInfoParser.parseTypeString(expression);
if (typeNodes == null) {
throw new InvalidRequirementSpec("bad type expression");
}
JSTypeExpression typeExpr = new JSTypeExpression(typeNodes, "conformance");
return compiler.getTypeRegistry().evaluateTypeExpressionInGlobalScope(typeExpr);
}
/**
* Validate the parameters and the 'this' type, of a new or call.
*
* @see TypeCheck#visitParameterList
*/
static boolean validateCall(
AbstractCompiler compiler,
Node callOrNew,
FunctionType functionType,
boolean isCallInvocation) {
checkState(callOrNew.isCall() || callOrNew.isNew());
return validateParameterList(compiler, callOrNew, functionType, isCallInvocation)
&& validateThis(callOrNew, functionType, isCallInvocation);
}
private static boolean validateThis(
Node callOrNew, FunctionType functionType, boolean isCallInvocation) {
if (callOrNew.isNew()) {
return true;
}
JSType thisType = functionType.getTypeOfThis();
if (thisType == null || thisType.isUnknownType()) {
return true;
}
Node thisNode =
isCallInvocation ? callOrNew.getSecondChild() : callOrNew.getFirstFirstChild();
JSType thisNodeType = thisNode.getJSType().restrictByNotNullOrUndefined();
return thisNodeType.isSubtypeOf(thisType);
}
private static boolean validateParameterList(
AbstractCompiler compiler,
Node callOrNew,
FunctionType functionType,
boolean isCallInvocation) {
Node arg = callOrNew.getSecondChild(); // skip the function name
if (isCallInvocation && arg != null) {
arg = arg.getNext();
}
// Get all the annotated types of the argument nodes
ImmutableList.Builder argumentTypes = ImmutableList.builder();
for (; arg != null; arg = arg.getNext()) {
JSType argType = arg.getJSType();
if (argType == null) {
argType = compiler.getTypeRegistry().getNativeType(JSTypeNative.UNKNOWN_TYPE);
}
argumentTypes.add(argType);
}
return functionType.acceptsArguments(argumentTypes.build());
}
/** Extracts the method name from a provided name. */
private static String getPropertyFromDeclarationName(String specName)
throws InvalidRequirementSpec {
String[] parts = specName.split("\\.prototype\\.");
checkState(parts.length == 1 || parts.length == 2);
if (parts.length == 2) {
return parts[1];
}
return null;
}
/** Extracts the class name from a provided name. */
private static String getClassFromDeclarationName(String specName)
throws InvalidRequirementSpec {
String tmp = specName;
String[] parts = tmp.split("\\.prototype\\.");
checkState(parts.length == 1 || parts.length == 2);
if (parts.length == 2) {
return parts[0];
}
return null;
}
private static String removeTypeDecl(String specName) throws InvalidRequirementSpec {
int index = specName.indexOf(':');
if (index < 1) {
throw new InvalidRequirementSpec("value should be in the form NAME:TYPE");
}
return specName.substring(0, index);
}
private static String getTypeFromValue(String specName) {
int index = specName.indexOf(':');
if (index < 1) {
return null;
}
return specName.substring(index + 1);
}
}
/** Restricted name call rule */
static class RestrictedNameCall extends AbstractRule {
private static class Restriction {
final Node name;
final FunctionType restrictedCallType;
Restriction(Node name, FunctionType restrictedCallType) {
this.name = name;
this.restrictedCallType = restrictedCallType;
}
}
private final ImmutableList restrictions;
RestrictedNameCall(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
if (requirement.getValueCount() == 0) {
throw new InvalidRequirementSpec("missing value");
}
ImmutableList.Builder builder = ImmutableList.builder();
for (String value : requirement.getValueList()) {
Node name = NodeUtil.newQName(compiler, getNameFromValue(value));
String restrictedDecl = ConformanceUtil.getTypeFromValue(value);
if (name == null || restrictedDecl == null) {
throw new InvalidRequirementSpec("bad prop value");
}
FunctionType restrictedCallType =
ConformanceUtil.evaluateTypeString(compiler, restrictedDecl).toMaybeFunctionType();
if (restrictedCallType == null) {
throw new InvalidRequirementSpec("invalid conformance type");
}
builder.add(new Restriction(name, restrictedCallType));
}
restrictions = builder.build();
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (ConformanceUtil.isCallTarget(n) && n.isQualifiedName()) {
// TODO(johnlenz): restrict to global names
for (int i = 0; i < restrictions.size(); i++) {
Restriction r = restrictions.get(i);
if (n.matchesQualifiedName(r.name)) {
if (!ConformanceUtil.validateCall(
compiler, n.getParent(), r.restrictedCallType, false)) {
return ConformanceResult.VIOLATION;
}
} else if (n.isGetProp()
&& n.getString().equals("call")
&& n.getFirstChild().matchesQualifiedName(r.name)) {
if (!ConformanceUtil.validateCall(
compiler, n.getParent(), r.restrictedCallType, true)) {
return ConformanceResult.VIOLATION;
}
}
}
}
return ConformanceResult.CONFORMANCE;
}
private static String getNameFromValue(String specName) {
int index = specName.indexOf(':');
if (index < 1) {
return null;
}
return specName.substring(0, index);
}
}
/** Banned property call rule */
static class RestrictedMethodCall extends AbstractRule {
private static class Restriction {
final JSType type;
final String property;
final FunctionType restrictedCallType;
Restriction(JSType type, String property, FunctionType restrictedCallType) {
this.type = type;
this.property = property;
this.restrictedCallType = restrictedCallType;
}
}
private final ImmutableList restrictions;
RestrictedMethodCall(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
if (requirement.getValueCount() == 0) {
throw new InvalidRequirementSpec("missing value");
}
JSTypeRegistry registry = compiler.getTypeRegistry();
ImmutableList.Builder builder = ImmutableList.builder();
for (String value : requirement.getValueList()) {
String type =
ConformanceUtil.getClassFromDeclarationName(ConformanceUtil.removeTypeDecl(value));
String property =
ConformanceUtil.getPropertyFromDeclarationName(ConformanceUtil.removeTypeDecl(value));
String restrictedDecl = ConformanceUtil.getTypeFromValue(value);
if (type == null || property == null || restrictedDecl == null) {
throw new InvalidRequirementSpec("bad prop value");
}
FunctionType restrictedCallType =
ConformanceUtil.evaluateTypeString(compiler, restrictedDecl).toMaybeFunctionType();
if (restrictedCallType == null) {
throw new InvalidRequirementSpec("invalid conformance type");
}
builder.add(new Restriction(registry.getGlobalType(type), property, restrictedCallType));
}
restrictions = builder.build();
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (!n.isGetProp() || !ConformanceUtil.isCallTarget(n)) {
return ConformanceResult.CONFORMANCE;
}
for (int i = 0; i < restrictions.size(); i++) {
Restriction r = restrictions.get(i);
ConformanceResult result = ConformanceResult.CONFORMANCE;
if (matchesProp(n, r)) {
result = checkConformance(t, n, r, false);
} else if (n.getString().equals("call") && matchesProp(n.getFirstChild(), r)) {
// handle .call invocation
result = checkConformance(t, n, r, true);
}
// TODO(johnlenz): should "apply" always be a possible violation?
if (result.level != ConformanceLevel.CONFORMANCE) {
return result;
}
}
return ConformanceResult.CONFORMANCE;
}
private ConformanceResult checkConformance(
NodeTraversal t, Node n, Restriction r, boolean isCallInvocation) {
JSTypeRegistry registry = t.getCompiler().getTypeRegistry();
JSType methodClassType = r.type;
Node lhs = isCallInvocation ? n.getFirstFirstChild() : n.getFirstChild();
if (methodClassType != null && lhs.getJSType() != null) {
JSType targetType = lhs.getJSType().restrictByNotNullOrUndefined();
if (ConformanceUtil.isLooseType(targetType)
|| targetType.equals(registry.getNativeType(JSTypeNative.OBJECT_TYPE))) {
if (reportLooseTypeViolations
&& !ConformanceUtil.validateCall(
compiler, n.getParent(), r.restrictedCallType, isCallInvocation)) {
return ConformanceResult.POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES;
}
} else if (targetType.isSubtypeOf(methodClassType)) {
if (!ConformanceUtil.validateCall(
compiler, n.getParent(), r.restrictedCallType, isCallInvocation)) {
return ConformanceResult.VIOLATION;
}
}
}
return ConformanceResult.CONFORMANCE;
}
private boolean matchesProp(Node n, Restriction r) {
return n.isGetProp() && n.getString().equals(r.property);
}
}
/** Restricted property write. */
static class RestrictedPropertyWrite extends AbstractRule {
private static class Restriction {
final JSType type;
final String property;
final JSType restrictedType;
Restriction(JSType type, String property, JSType restrictedType) {
this.type = type;
this.property = property;
this.restrictedType = restrictedType;
}
}
private final ImmutableList restrictions;
RestrictedPropertyWrite(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
if (requirement.getValueCount() == 0) {
throw new InvalidRequirementSpec("missing value");
}
JSTypeRegistry registry = compiler.getTypeRegistry();
ImmutableList.Builder builder = ImmutableList.builder();
for (String value : requirement.getValueList()) {
String type =
ConformanceUtil.getClassFromDeclarationName(ConformanceUtil.removeTypeDecl(value));
String property =
ConformanceUtil.getPropertyFromDeclarationName(ConformanceUtil.removeTypeDecl(value));
String restrictedDecl = ConformanceUtil.getTypeFromValue(value);
if (type == null || property == null || restrictedDecl == null) {
throw new InvalidRequirementSpec("bad prop value");
}
JSType restrictedType = ConformanceUtil.evaluateTypeString(compiler, restrictedDecl);
builder.add(new Restriction(registry.getGlobalType(type), property, restrictedType));
}
restrictions = builder.build();
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isGetProp() && NodeUtil.isLhsOfAssign(n)) {
JSType rhsType = n.getNext().getJSType();
JSType targetType = n.getFirstChild().getJSType();
if (rhsType != null && targetType != null) {
JSType targetNotNullType = null;
for (Restriction r : restrictions) {
if (n.getString().equals(r.property)) {
if (!rhsType.isSubtypeOf(r.restrictedType)) {
if (ConformanceUtil.isLooseType(targetType)) {
if (reportLooseTypeViolations) {
return ConformanceResult.POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES;
}
} else {
if (targetNotNullType == null) {
targetNotNullType = targetType.restrictByNotNullOrUndefined();
}
if (targetNotNullType.isSubtypeOf(r.type)) {
return ConformanceResult.VIOLATION;
}
}
}
}
}
}
}
return ConformanceResult.CONFORMANCE;
}
}
/** Banned Code Pattern rule */
static class BannedCodePattern extends AbstractRule {
private final ImmutableList restrictions;
BannedCodePattern(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
if (requirement.getValueCount() == 0) {
throw new InvalidRequirementSpec("missing value");
}
ImmutableList.Builder builder = ImmutableList.builder();
for (String value : requirement.getValueList()) {
Node parseRoot = new JsAst(SourceFile.fromCode("", value)).getAstRoot(compiler);
if (!parseRoot.hasOneChild() || !parseRoot.getFirstChild().isFunction()) {
throw new InvalidRequirementSpec("invalid conformance template: " + value);
}
Node templateRoot = parseRoot.getFirstChild();
TemplateAstMatcher astMatcher =
new TemplateAstMatcher(compiler, templateRoot, typeMatchingStrategy);
builder.add(astMatcher);
}
restrictions = builder.build();
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
boolean possibleViolation = false;
for (int i = 0; i < restrictions.size(); i++) {
TemplateAstMatcher matcher = restrictions.get(i);
if (matcher.matches(n)) {
if (matcher.isLooseMatch()) {
possibleViolation = true;
} else {
return ConformanceResult.VIOLATION;
}
}
}
return possibleViolation && reportLooseTypeViolations
? ConformanceResult.POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES
: ConformanceResult.CONFORMANCE;
}
}
/** A custom rule proxy, for rules that we load dynamically. */
static class CustomRuleProxy implements Rule {
final Rule customRule;
CustomRuleProxy(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
if (!requirement.hasJavaClass()) {
throw new InvalidRequirementSpec("missing java_class");
}
customRule = createRule(compiler, requirement);
}
@Override
public void check(NodeTraversal t, Node n) {
customRule.check(t, n);
}
private Rule createRule(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
try {
Class custom = getRuleClass(requirement.getJavaClass());
Constructor ctor = getRuleConstructor(custom);
Rule rule;
try {
rule = (Rule) (ctor.newInstance(compiler, requirement));
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
if (cause instanceof InvalidRequirementSpec) {
throw (InvalidRequirementSpec) cause;
}
throw new RuntimeException(cause);
}
return rule;
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException e) {
throw new RuntimeException(e);
}
}
private Constructor getRuleConstructor(Class cls) throws InvalidRequirementSpec {
for (Constructor ctor : cls.getConstructors()) {
Class[] paramClasses = ctor.getParameterTypes();
if (paramClasses.length == 2) {
TypeToken param1 = TypeToken.of(paramClasses[0]);
TypeToken param2 = TypeToken.of(paramClasses[1]);
if (param1.isSupertypeOf(COMPILER_TYPE) && param2.isSupertypeOf(REQUIREMENT_TYPE)) {
return ctor;
}
}
}
throw new InvalidRequirementSpec("No valid class constructors found.");
}
private static final TypeToken RULE_TYPE = new TypeToken() {};
private static final TypeToken COMPILER_TYPE =
new TypeToken() {};
private static final TypeToken REQUIREMENT_TYPE = new TypeToken() {};
private Class getRuleClass(String className) throws InvalidRequirementSpec {
Class customClass;
try {
customClass = Class.forName(className);
} catch (ClassNotFoundException e) {
throw new InvalidRequirementSpec("JavaClass not found.");
}
if (RULE_TYPE.isSupertypeOf(TypeToken.of(customClass))) {
@SuppressWarnings("unchecked") // Assignable to Rule;
Class ruleClass = (Class) customClass;
return ruleClass;
}
throw new InvalidRequirementSpec("JavaClass is not a rule.");
}
}
/** Banned for/of loops */
public static final class BanForOf extends AbstractRule {
public BanForOf(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isForOf() || n.isForAwaitOf()) {
return ConformanceResult.VIOLATION;
}
return ConformanceResult.CONFORMANCE;
}
}
/** Require "use strict" rule */
public static class RequireUseStrict extends AbstractRule {
public RequireUseStrict(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
if (!requirement.getValueList().isEmpty()) {
throw new InvalidRequirementSpec("invalid value");
}
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
return (n.isScript() && !n.isUseStrict())
? ConformanceResult.VIOLATION
: ConformanceResult.CONFORMANCE;
}
}
/** Banned throw of non-error object types. */
public static final class BanThrowOfNonErrorTypes extends AbstractRule {
final JSType errorObjType;
public BanThrowOfNonErrorTypes(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
errorObjType = compiler.getTypeRegistry().getGlobalType("Error");
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (errorObjType != null && n.isThrow()) {
JSType thrown = n.getFirstChild().getJSType();
if (thrown != null) {
// Allow vague types, as is typical of re-throws of exceptions
if (!thrown.isUnknownType()
&& !thrown.isAllType()
&& !thrown.isEmptyType()
&& !thrown.isSubtypeOf(errorObjType)) {
return ConformanceResult.VIOLATION;
}
}
}
return ConformanceResult.CONFORMANCE;
}
}
/** Banned dereferencing null or undefined types. */
public static final class BanNullDeref extends AbstractTypeRestrictionRule {
public BanNullDeref(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
boolean violation;
switch (n.getToken()) {
case GETPROP:
case GETELEM:
case NEW:
case CALL:
violation = report(n.getFirstChild());
break;
case IN:
violation = report(n.getLastChild());
break;
default:
violation = false;
break;
}
return violation ? ConformanceResult.VIOLATION : ConformanceResult.CONFORMANCE;
}
boolean report(Node n) {
return n.getJSType() != null && isKnown(n) && invalidDeref(n) && !isAllowlistedType(n);
}
// Whether the type is known to be invalid to dereference.
private boolean invalidDeref(Node n) {
JSType type = n.getJSType();
// TODO(johnlenz): top type should not be allowed here
return !type.isAllType() && (type.isNullable() || type.isVoidable());
}
}
/** Banned unknown "this" types. */
public static final class BanUnknownThis extends AbstractTypeRestrictionRule {
private final Set reports = Sets.newIdentityHashSet();
public BanUnknownThis(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isThis()) {
JSType type = n.getJSType();
if (type != null && type.isUnknownType() && !isTypeImmediatelyTightened(n)) {
Node root = t.getScopeRoot();
if (!reports.contains(root)) {
reports.add(root);
return ConformanceResult.VIOLATION;
}
}
}
return ConformanceResult.CONFORMANCE;
}
}
/**
* Banned unknown type references of the form "this.prop" unless
* it is immediately cast,
* it is a @template type (until template type restricts are enabled) or
* the value is unused.
* the "this" type is unknown (as this is expected to be used with BanUnknownThis which would
* have already reported the root cause).
*/
public static final class BanUnknownDirectThisPropsReferences
extends AbstractTypeRestrictionRule {
public BanUnknownDirectThisPropsReferences(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isGetProp()
&& isKnownThis(n.getFirstChild()) // not a cascading unknown
&& isUnknown(n)
&& !isTemplateType(n)
&& isUsed(n) // skip most assignments, etc
&& !isTypeImmediatelyTightened(n)
&& !isExplicitlyUnknown(n)) {
return ConformanceResult.VIOLATION;
}
return ConformanceResult.CONFORMANCE;
}
private static boolean isKnownThis(Node n) {
return n.isThis() && !isUnknown(n);
}
private static boolean isExplicitlyUnknown(Node n) {
ObjectType owner = ObjectType.cast(n.getFirstChild().getJSType());
Property prop = owner != null ? owner.getSlot(n.getString()) : null;
return prop != null && !prop.isTypeInferred();
}
}
/**
* Banned unknown type references of the form "instance.prop" unless
* (a) it is immediately cast/asserted, or
* (b) it is a @template type (until template type restrictions are enabled), or
* (c) the value is unused, or
* (d) the source object type is unknown (to avoid error cascades)
*/
public static final class BanUnknownTypedClassPropsReferences
extends AbstractTypeRestrictionRule {
public BanUnknownTypedClassPropsReferences(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected boolean tsIsAllowlisted() {
return true;
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node getprop) {
if (getprop.isGetProp()
&& isUnknown(getprop)
&& isUsed(getprop) // skip most assignments, etc
&& !isTypeImmediatelyTightened(getprop)
&& isCheckablePropertySource(getprop.getFirstChild()) // not a cascading unknown
&& !isTemplateType(getprop)
&& !isDeclaredUnknown(getprop)) {
String propName = getprop.getString();
String typeName = getprop.getFirstChild().getJSType().toString();
return new ConformanceResult(
ConformanceLevel.VIOLATION,
"The property \"" + propName + "\" on type \"" + typeName + "\"");
}
return ConformanceResult.CONFORMANCE;
}
private boolean isCheckablePropertySource(Node n) {
return isKnown(n)
&& !isTop(n)
&& isClassType(n)
&& !isNativeObjectType(n)
&& !isAllowlistedType(n);
}
private boolean isClassType(Node n) {
ObjectType type = n.getJSType().restrictByNotNullOrUndefined().toMaybeObjectType();
if (type == null || !type.isInstanceType()) {
return false;
}
FunctionType ctor = type.getConstructor();
if (ctor == null) {
return false;
}
JSDocInfo info = ctor.getJSDocInfo();
Node source = ctor.getSource();
return (info != null && info.isConstructorOrInterface())
|| (source != null && source.isClass());
}
private boolean isDeclaredUnknown(Node n) {
Node target = n.getFirstChild();
ObjectType targetType = target.getJSType().restrictByNotNullOrUndefined().toMaybeObjectType();
if (targetType == null) {
return false;
}
JSDocInfo info = targetType.getPropertyJSDocInfo(n.getString());
if (info == null || !info.hasType()) {
return false;
}
JSTypeExpression expr = info.getType();
Node typeExprNode = expr.getRoot();
if (typeExprNode.getToken() == Token.QMARK && !typeExprNode.hasChildren()) {
return true;
} else if (typeExprNode.getToken() == Token.PIPE) {
// Might be a union type including ? that's collapsed during checking.
for (Node child = typeExprNode.getFirstChild(); child != null; child = child.getNext()) {
if (child.getToken() == Token.QMARK) {
return true;
}
}
}
return false;
}
}
/**
* Banned accessing properties from objects that are unresolved forward-declared type names. For
* legacy reasons this is allowed but causes unexpected weaknesses in the type inference.
*/
public static final class BanUnresolvedType extends AbstractTypeRestrictionRule {
public BanUnresolvedType(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isGetProp()) {
Node target = n.getFirstChild();
JSType type = target.getJSType();
JSType nonConformingPart = getNonConformingPart(type);
if (nonConformingPart != null && !isTypeImmediatelyTightened(n)) {
return new ConformanceResult(
ConformanceLevel.VIOLATION,
"Reference to type '" + nonConformingPart + "' never resolved.");
}
}
return ConformanceResult.CONFORMANCE;
}
private static @Nullable JSType getNonConformingPart(JSType type) {
if (type == null) {
return null;
}
if (type.isUnionType()) {
// unwrap union types which might contain unresolved type name
// references for example {Foo|undefined}
for (JSType part : type.getUnionMembers()) {
JSType nonConformingPart = getNonConformingPart(part);
if (nonConformingPart != null) {
return nonConformingPart;
}
}
} else if (type.isNoResolvedType()) {
return type;
}
return null;
}
}
/** Ban any use of unresolved forward-declared types */
public static final class StrictBanUnresolvedType extends AbstractTypeRestrictionRule {
public StrictBanUnresolvedType(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
JSType nonConformingPart = BanUnresolvedType.getNonConformingPart(n.getJSType());
if (nonConformingPart != null && !isTypeImmediatelyTightened(n)) {
return new ConformanceResult(
ConformanceLevel.VIOLATION,
"Reference to type '" + nonConformingPart + "' never resolved.");
}
return ConformanceResult.CONFORMANCE;
}
}
/** Banned global var declarations. */
public static final class BanGlobalVars extends AbstractRule {
private final ImmutableSet allowlistedNames;
public BanGlobalVars(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
this.allowlistedNames = ImmutableSet.copyOf(requirement.getValueList());
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (t.inGlobalScope()
&& NodeUtil.isDeclaration(n)
&& !n.getBooleanProp(Node.IS_NAMESPACE)
&& !isAllowlisted(n)) {
Node enclosingScript = NodeUtil.getEnclosingScript(n);
if (enclosingScript != null
&& (enclosingScript.getBooleanProp(Node.GOOG_MODULE)
|| enclosingScript.getBooleanProp(Node.ES6_MODULE)
|| enclosingScript.getInputId().equals(compiler.getSyntheticCodeInputId()))) {
return ConformanceResult.CONFORMANCE;
}
return ConformanceResult.VIOLATION;
}
return ConformanceResult.CONFORMANCE;
}
private boolean isAllowlisted(Node n) {
if (n.isFromExterns()) {
return true;
}
if (n.isFunction()) {
return isAllowlistedName(n.getFirstChild().getString());
}
if (NodeUtil.isNameDeclaration(n)) {
for (Node name : NodeUtil.findLhsNodesInNode(n)) {
if (!isAllowlistedName(name.getString())) {
return false;
}
}
return true;
}
return false;
}
private boolean isAllowlistedName(String name) {
if (this.allowlistedNames.contains(name)) {
return true;
}
// names created by JSCompiler internals
return name.equals("$jscomp")
|| name.startsWith("$jscomp$compprop")
|| ClosureRewriteModule.isModuleContent(name)
|| ClosureRewriteModule.isModuleExport(name)
|| ScopedAliases.isScopedAliases(name);
}
}
/** Checks that file does not include an @enhance annotation for a banned namespace. */
public static final class BannedEnhance extends AbstractRule {
private final ImmutableSet bannedEnhancedNamespaces;
public BannedEnhance(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
if (requirement.getValueCount() == 0) {
throw new InvalidRequirementSpec("missing value");
}
this.bannedEnhancedNamespaces = ImmutableSet.copyOf(requirement.getValueList());
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
JSDocInfo docInfo = n.getJSDocInfo();
if (docInfo == null || !docInfo.hasEnhance()) {
return ConformanceResult.CONFORMANCE;
}
for (String banned : this.bannedEnhancedNamespaces) {
if (docInfo.getEnhance().equals(banned)) {
return new ConformanceResult(
ConformanceLevel.VIOLATION, "The enhanced namespace \"" + banned + "\"");
}
}
return ConformanceResult.CONFORMANCE;
}
private static final Precondition IS_SCRIPT_NODE =
new Precondition() {
@Override
public boolean shouldCheck(Node n) {
return n.isScript();
}
};
@Override
public final Precondition getPrecondition() {
return IS_SCRIPT_NODE;
}
}
private static final QualifiedName GOOG_DOM = QualifiedName.of("goog.dom");
private static final QualifiedName GOOG_DOM_TAGNAME = QualifiedName.of("goog.dom.TagName");
/**
* Bans {@code document.createElement} and similar methods with string literal parameter specified
* in {@code value}, e.g. {@code value: 'script'}. The purpose of banning these is that they don't
* provide the type information which hinders other rules. Authors should use e.g. {@code
* goog.dom.createElement(goog.dom.TagName.SCRIPT)} which returns HTMLScriptElement.
*/
public static final class BanCreateElement extends AbstractRule {
private final Set bannedTags;
private final JSType domHelperType;
private final JSType documentType;
public BanCreateElement(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
bannedTags = new HashSet<>();
for (String value : requirement.getValueList()) {
bannedTags.add(Ascii.toLowerCase(value));
}
if (bannedTags.isEmpty()) {
throw new InvalidRequirementSpec("Specify one or more values.");
}
domHelperType = compiler.getTypeRegistry().getGlobalType("goog.dom.DomHelper");
documentType = compiler.getTypeRegistry().getGlobalType("Document");
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (n.isCall()) {
Node tag = n.getSecondChild();
if (tag != null
&& tag.isStringLit()
&& bannedTags.contains(Ascii.toLowerCase(tag.getString()))) {
return checkCreateElement(n);
}
}
return ConformanceResult.CONFORMANCE;
}
private ConformanceResult checkCreateElement(Node n) {
Node target = n.getFirstChild();
if (!target.isGetProp()) {
return ConformanceResult.CONFORMANCE;
}
String functionName = target.getString();
if (!"createElement".equals(functionName) && !"createDom".equals(functionName)) {
return ConformanceResult.CONFORMANCE;
}
Node srcObj = target.getFirstChild();
if (GOOG_DOM.matches(srcObj)) {
return ConformanceResult.VIOLATION;
}
JSType type = srcObj.getJSType();
if (type == null || ConformanceUtil.isLooseType(type)) {
return reportLooseTypeViolations
? ConformanceResult.POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES
: ConformanceResult.CONFORMANCE;
}
if ((domHelperType != null && domHelperType.isSubtypeOf(type))
|| (documentType != null && documentType.isSubtypeOf(type))) {
return ConformanceResult.VIOLATION;
}
return ConformanceResult.CONFORMANCE;
}
}
/**
* Ban {@code goog.dom.createDom} and {@code goog.dom.DomHelper#createDom} with parameters
* specified in {@code value} in the format tagname.attribute, e.g. {@code value: 'iframe.src'}.
* Tag name might be also {@code *} to ban the attribute in any tag. Note that string literal
* values assigned to banned attributes are allowed as they couldn't be attacker controlled.
*/
public static final class BanCreateDom extends AbstractRule {
private final List bannedTagAttrs;
private final JSType domHelperType;
private final JSType classNameTypes;
public BanCreateDom(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
bannedTagAttrs = new ArrayList<>();
for (String value : requirement.getValueList()) {
String[] tagAttr = value.split("\\.");
if (tagAttr.length != 2 || tagAttr[0].isEmpty() || tagAttr[1].isEmpty()) {
throw new InvalidRequirementSpec("Values must be in the format tagname.attribute.");
}
tagAttr[0] = tagAttr[0].toLowerCase(Locale.ROOT);
bannedTagAttrs.add(tagAttr);
}
if (bannedTagAttrs.isEmpty()) {
throw new InvalidRequirementSpec("Specify one or more values.");
}
domHelperType = compiler.getTypeRegistry().getGlobalType("goog.dom.DomHelper");
classNameTypes =
compiler
.getTypeRegistry()
.createUnionType(
compiler.getTypeRegistry().getNativeType(JSTypeNative.STRING_TYPE),
compiler.getTypeRegistry().getNativeType(JSTypeNative.ARRAY_TYPE),
compiler.getTypeRegistry().getNativeType(JSTypeNative.NULL_TYPE),
compiler.getTypeRegistry().getNativeType(JSTypeNative.VOID_TYPE));
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (!isCreateDomCall(n)) {
return ConformanceResult.CONFORMANCE;
}
if (n.getChildCount() < 3) {
// goog.dom.createDom('iframe') is fine.
return ConformanceResult.CONFORMANCE;
}
Collection tagNames = getTagNames(n.getSecondChild());
Node attrs = n.getChildAtIndex(2);
JSType attrsType = attrs.getJSType();
// TODO(tbreisacher): Remove this after the typechecker understands ES6.
if (attrsType == null) {
// Type information is not available; don't run this check.
return ConformanceResult.CONFORMANCE;
}
// String or array attribute sets the class.
boolean isClassName = !attrsType.isUnknownType() && attrsType.isSubtypeOf(classNameTypes);
if (attrs.isNull() || (attrsType != null && attrsType.isVoidType())) {
// goog.dom.createDom('iframe', null) is fine.
return ConformanceResult.CONFORMANCE;
}
for (String[] tagAttr : bannedTagAttrs) {
if (tagNames != null && !tagNames.contains(tagAttr[0]) && !tagAttr[0].equals("*")) {
continue;
}
ConformanceResult violation;
if (tagNames != null || tagAttr[0].equals("*")) {
violation = ConformanceResult.VIOLATION;
} else if (reportLooseTypeViolations) {
violation = ConformanceResult.POSSIBLE_VIOLATION;
} else {
violation = ConformanceResult.CONFORMANCE;
}
if (isClassName) {
if (!tagAttr[1].equals("class")) {
continue;
}
return violation;
}
if (tagAttr[1].equals("textContent")
&& n.getChildCount() > 3
&& violation != ConformanceResult.CONFORMANCE) {
return violation;
}
if (!attrs.isObjectLit()) {
// Attrs is not an object literal and tagName matches or is unknown.
return reportLooseTypeViolations
? ConformanceResult.POSSIBLE_VIOLATION
: ConformanceResult.CONFORMANCE;
}
Node prop = NodeUtil.getFirstPropMatchingKey(attrs, tagAttr[1]);
if (prop != null) {
if (NodeUtil.isSomeCompileTimeConstStringValue(prop)) {
// Ignore string literal values.
continue;
}
return violation;
}
for (Node attr = attrs.getFirstChild(); attr != null; attr = attr.getNext()) {
if (attr.isComputedProp()) {
// We don't know if the computed property matches 'src' or not
return reportLooseTypeViolations
? ConformanceResult.POSSIBLE_VIOLATION_DUE_TO_LOOSE_TYPES
: ConformanceResult.CONFORMANCE;
}
}
}
return ConformanceResult.CONFORMANCE;
}
private ImmutableCollection getTagNames(Node tag) {
if (tag.isStringLit()) {
return ImmutableSet.of(tag.getString().toLowerCase(Locale.ROOT));
} else if (tag.isGetProp() && GOOG_DOM_TAGNAME.matches(tag.getFirstChild())) {
return ImmutableSet.of(tag.getString().toLowerCase(Locale.ROOT));
}
// TODO(jakubvrana): Support union, e.g. {!TagName|!TagName}.
JSType type = tag.getJSType();
if (type == null || !type.isTemplatizedType()) {
return null;
}
ObjectType typeAsObj = type.toMaybeObjectType();
if (typeAsObj.getRawType().getDisplayName().equals("goog.dom.TagName")) {
JSType tagType = Iterables.getOnlyElement(typeAsObj.getTemplateTypes());
return ELEMENT_TAG_NAMES.get(tagType.getDisplayName());
}
return null;
}
private static final ImmutableMultimap ELEMENT_TAG_NAMES =
ImmutableMultimap.builder()
.put("HTMLAnchorElement", "a")
.put("HTMLAppletElement", "applet")
.put("HTMLAreaElement", "area")
.put("HTMLAudioElement", "audio")
.put("HTMLBRElement", "br")
.put("HTMLBaseElement", "base")
.put("HTMLBaseFontElement", "basefont")
.put("HTMLBodyElement", "body")
.put("HTMLButtonElement", "button")
.put("HTMLCanvasElement", "canvas")
.put("HTMLDListElement", "dl")
.put("HTMLDataListElement", "datalist")
.put("HTMLDetailsElement", "details")
.put("HTMLDialogElement", "dialog")
.put("HTMLDirectoryElement", "dir")
.put("HTMLDivElement", "div")
.put("HTMLEmbedElement", "embed")
.put("HTMLFieldSetElement", "fieldset")
.put("HTMLFontElement", "font")
.put("HTMLFormElement", "form")
.put("HTMLFrameElement", "frame")
.put("HTMLFrameSetElement", "frameset")
.put("HTMLHRElement", "hr")
.put("HTMLHeadElement", "head")
.put("HTMLHeadingElement", "h1")
.put("HTMLHeadingElement", "h2")
.put("HTMLHeadingElement", "h3")
.put("HTMLHeadingElement", "h4")
.put("HTMLHeadingElement", "h5")
.put("HTMLHeadingElement", "h6")
.put("HTMLHtmlElement", "html")
.put("HTMLIFrameElement", "iframe")
.put("HTMLImageElement", "img")
.put("HTMLInputElement", "input")
.put("HTMLIsIndexElement", "isindex")
.put("HTMLLIElement", "li")
.put("HTMLLabelElement", "label")
.put("HTMLLegendElement", "legend")
.put("HTMLLinkElement", "link")
.put("HTMLMapElement", "map")
.put("HTMLMenuElement", "menu")
.put("HTMLMetaElement", "meta")
.put("HTMLMeterElement", "meter")
.put("HTMLModElement", "del")
.put("HTMLModElement", "ins")
.put("HTMLOListElement", "ol")
.put("HTMLObjectElement", "object")
.put("HTMLOptGroupElement", "optgroup")
.put("HTMLOptionElement", "option")
.put("HTMLOutputElement", "output")
.put("HTMLParagraphElement", "p")
.put("HTMLParamElement", "param")
.put("HTMLPreElement", "pre")
.put("HTMLProgressElement", "progress")
.put("HTMLQuoteElement", "blockquote")
.put("HTMLQuoteElement", "q")
.put("HTMLScriptElement", "script")
.put("HTMLSelectElement", "select")
.put("HTMLSourceElement", "source")
.put("HTMLSpanElement", "span")
.put("HTMLStyleElement", "style")
.put("HTMLTableCaptionElement", "caption")
.put("HTMLTableCellElement", "td")
.put("HTMLTableCellElement", "th")
.put("HTMLTableColElement", "col")
.put("HTMLTableColElement", "colgroup")
.put("HTMLTableElement", "table")
.put("HTMLTableRowElement", "tr")
.put("HTMLTableSectionElement", "tbody")
.put("HTMLTableSectionElement", "tfoot")
.put("HTMLTableSectionElement", "thead")
.put("HTMLTemplateElement", "template")
.put("HTMLTextAreaElement", "textarea")
.put("HTMLTitleElement", "title")
.put("HTMLTrackElement", "track")
.put("HTMLUListElement", "ul")
.put("HTMLVideoElement", "video")
.build();
private boolean isCreateDomCall(Node n) {
if (!n.isCall()) {
return false;
}
Node target = n.getFirstChild();
if (!target.isGetProp()) {
return false;
}
if (!"createDom".equals(target.getString())) {
return false;
}
Node srcObj = target.getFirstChild();
if (GOOG_DOM.matches(srcObj)) {
return true;
}
JSType type = srcObj.getJSType();
if (type == null) {
return false;
}
if (type.equals(domHelperType)) {
return true;
}
return false;
}
}
/**
* Ban {@code Element#setAttribute} with attribute names specified in {@code value} or any dynamic
* string.
*
* Using the element access syntax to set properties of {@code Element} is considered to be
* equivalent to calling {@code Element#setAttribute}. E.g., {@code element[prop] = value} is
* treated as {@code element.setAttribute(prop, value)} when {@code element} has the type {@code
* Element}.
*/
public static final class BanSetAttribute extends AbstractRule {
private final ImmutableList bannedAttrs;
private static final String SET_ATTRIBUTE = "setAttribute";
private static final String SET_ATTRIBUTE_NS = "setAttributeNS";
private static final String SET_ATTRIBUTE_NODE = "setAttributeNode";
private static final String SET_ATTRIBUTE_NODE_NS = "setAttributeNodeNS";
private static final ImmutableSet BANNED_PROPERTIES =
ImmutableSet.of(SET_ATTRIBUTE, SET_ATTRIBUTE_NS, SET_ATTRIBUTE_NODE, SET_ATTRIBUTE_NODE_NS);
/**
* Create a custom checker to ban {@code Element#setAttribute} based on conformance a
* requirement spec. Names in {@code value} fields indicate the attribute names that should be
* blocked. Throws {@link InvalidRequirementSpec} if the requirement is malformed.
*/
public BanSetAttribute(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
bannedAttrs =
requirement.getValueList().stream()
.map(v -> v.toLowerCase(Locale.ROOT))
.collect(toImmutableList());
}
private static boolean isEventHandlerAttrName(String attr) {
return !attr.equals("on") && attr.startsWith("on");
}
@Override
protected ConformanceResult checkConformance(NodeTraversal traversal, Node node) {
if (node.isCall()) {
return checkConformanceOnPropertyCall(traversal, node);
} else if (node.isGetElem() && NodeUtil.isLValue(node)) {
return checkConformanceOnGetElement(node);
}
return ConformanceResult.CONFORMANCE;
}
private ConformanceResult checkConformanceOnPropertyCall(NodeTraversal traversal, Node node) {
Optional calledProperty = getBannedPropertyName(node);
if (!calledProperty.isPresent()) {
return ConformanceResult.CONFORMANCE;
}
if (!calledProperty.get().equals(SET_ATTRIBUTE)) {
return ConformanceResult.VIOLATION;
}
// If the function is called with less than two arguments it's either a false positive or
// uncompilable code.
if (node.getChildCount() < 3) {
return ConformanceResult.CONFORMANCE;
}
Node attr = node.getSecondChild();
String attrName = inferStringValue(traversal.getScope(), attr);
if (attrName == null) {
// xid() obfuscates attribute names, thus never clashing with security-sensitive attributes.
return isXid(attr.getJSType())
? ConformanceResult.CONFORMANCE
: ConformanceResult.VIOLATION;
}
attrName = attrName.toLowerCase(Locale.ROOT);
if (bannedAttrs.contains(attrName) || isEventHandlerAttrName(attrName)) {
return ConformanceResult.VIOLATION;
}
return ConformanceResult.CONFORMANCE;
}
private Optional getBannedPropertyName(Node node) {
Node target = node.getFirstChild();
if (!target.isGetProp()) {
return Optional.absent();
}
String propertyName = target.getString();
if (!BANNED_PROPERTIES.contains(propertyName)) {
return Optional.absent();
}
JSType type = target.getFirstChild().getJSType();
if (type == null) {
return Optional.absent();
}
JSType elementType = compiler.getTypeRegistry().getGlobalType("Element");
if (elementType != null && type.isSubtypeOf(elementType)) {
return Optional.of(propertyName);
}
return Optional.absent();
}
private ConformanceResult checkConformanceOnGetElement(Node node) {
Node key = node.getSecondChild();
if (key.isStringLit()) {
String keyName = key.getString().toLowerCase(Locale.ROOT);
if (!bannedAttrs.contains(keyName) && !isEventHandlerAttrName(keyName)) {
return ConformanceResult.CONFORMANCE;
} else if (hasElementType(node)) {
return ConformanceResult.VIOLATION;
}
} else if (hasElementType(node)) { // key is not a string literal.
JSType keyType = key.getJSType();
if (keyType == null || isXid(keyType)) {
return ConformanceResult.CONFORMANCE;
}
// We have seen code using other types of keys (e.g., numbers) for element access. Only
// report
// violations if the key is explicitly typed as string or the union of string and other
// types.
if (keyType.isString()) {
return ConformanceResult.VIOLATION;
}
if (keyType.isUnionType()) {
for (JSType alternate : keyType.toMaybeUnionType().getAlternates()) {
if (alternate.isString()) {
return ConformanceResult.VIOLATION;
}
}
}
}
return ConformanceResult.CONFORMANCE;
}
private boolean hasElementType(Node node) {
JSType objType = node.getFirstChild().getJSType();
JSType elementType = compiler.getTypeRegistry().getGlobalType("Element");
// Do not further check the node if there's no type information available.
if (objType == null || elementType == null) {
return false;
}
// If the type of the object is not known to be a subtype of Element, the code is not
// evquivlanet to setAttribute. Without this check, we will get overwhelmed by false
// positives.
if (objType.isUnknownType() || objType.isEmptyType() || !objType.isSubtypeOf(elementType)) {
return false;
}
return true;
}
private boolean isXid(JSType type) {
if (type == null) {
return false;
}
EnumElementType enumElTy = type.toMaybeEnumElementType();
if (enumElTy != null
&& enumElTy.getEnumType().getReferenceName().equals("enum{xid.String}")) {
return true;
}
return false;
}
@Nullable
private String inferStringValue(Scope scope, Node node) {
if (node == null) {
return null;
}
switch (node.getToken()) {
case STRING_KEY:
case STRINGLIT:
case TEMPLATELIT:
case TEMPLATELIT_STRING:
return NodeUtil.getStringValue(node);
case NAME:
if (scope == null) {
return null;
}
String name = node.getString();
Var var = scope.getVar(name);
if (var == null || !var.isConst()) {
return null;
}
Node initialValue = var.getInitialValue();
return inferStringValue(var.getScope(), initialValue);
case GETPROP:
JSType type = node.getJSType();
if (type == null || !type.isEnumElementType()) {
// For simplicity, only support enums. The JS style guide requires enums to be
// effectively immutable and all enum items should be statically known.
// See go/js-style#features-objects-enums.
return null;
}
Node enumSource = type.toMaybeEnumElementType().getEnumType().getSource();
if (enumSource == null) {
return null;
}
if (!enumSource.isObjectLit() && !enumSource.isClassMembers()) {
return null;
}
return inferStringValue(
null, NodeUtil.getFirstPropMatchingKey(enumSource, node.getString()));
default:
return null;
}
}
}
/**
* Ban {@code Document#execCommand} with command names specified in {@code value} or any dynamic
* string.
*/
public static final class BanExecCommand extends AbstractRule {
private final ImmutableList bannedAttrs;
/**
* Creates a custom checker to ban {@code Document#execCommand} based on a conformance
* requirement spec. Names in {@code value} fields indicate the attribute names that should be
* blocked.
*
* @throws InvalidRequirementSpec if the requirement is malformed
*/
public BanExecCommand(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
bannedAttrs =
requirement.getValueList().stream()
.map(v -> v.toLowerCase(Locale.ROOT))
.collect(toImmutableList());
}
@Override
protected ConformanceResult checkConformance(NodeTraversal traversal, Node node) {
if (!isBannedProperty(node)) {
return ConformanceResult.CONFORMANCE;
}
// If the function is called without arguments then it's either a false positive or
// uncompilable code.
if (node.getChildCount() < 2) {
return ConformanceResult.CONFORMANCE;
}
Node attr = node.getSecondChild();
if (!attr.isStringLit()) {
return ConformanceResult.VIOLATION;
}
String attrName = attr.getString();
if (bannedAttrs.contains(attrName.toLowerCase(Locale.ROOT))) {
return ConformanceResult.VIOLATION;
}
return ConformanceResult.CONFORMANCE;
}
private boolean isBannedProperty(Node node) {
if (!node.isCall()) {
return false;
}
Node target = node.getFirstChild();
if (!target.isGetProp()) {
return false;
}
String propertyName = target.getString();
if (!propertyName.equals("execCommand")) {
return false;
}
JSType type = target.getFirstChild().getJSType();
if (type == null) {
return false;
}
JSType documentType = compiler.getTypeRegistry().getGlobalType("Document");
if (documentType == null || !type.isSubtypeOf(documentType)) {
return false;
}
return true;
}
}
/** Checks that {@code this} is not being referenced directly within a static member function. */
public static final class BanStaticThis extends AbstractTypeRestrictionRule {
public BanStaticThis(AbstractCompiler compiler, Requirement requirement)
throws InvalidRequirementSpec {
super(compiler, requirement);
}
@Override
protected ConformanceResult checkConformance(NodeTraversal t, Node n) {
if (!n.isThis()) {
return ConformanceResult.CONFORMANCE;
}
Node enclosingFunction = NodeUtil.getEnclosingNonArrowFunction(n);
if (enclosingFunction != null && isStaticMethod(enclosingFunction)) {
return ConformanceResult.VIOLATION;
}
return ConformanceResult.CONFORMANCE;
}
private static boolean isStaticMethod(Node n) {
checkArgument(n.isFunction());
Node parent = n.getParent();
return parent != null && parent.isMemberFunctionDef() && parent.isStaticMember();
}
}
}