Add support for adding fingerprint prefix install constraints

Since more install constraints could be added in the future, add a new
option for inserting just fingerprint prefixes.

Bug: 270562509
Test: atest aapt2_tests
Change-Id: If357c6df09491fa1bec5fe1a00a682d634af69b7

tools/aapt2/cmd/Link.h

@@ -209,6 +209,8 @@ class LinkCommand : public Command {
     AddOptionalFlag("--compile-sdk-version-name",
         "Version name to inject into the AndroidManifest.xml if none is present.",
         &options_.manifest_fixer_options.compile_sdk_version_codename);
+    AddOptionalFlagList("--fingerprint-prefix", "Fingerprint prefix to add to install constraints.",
+                        &options_.manifest_fixer_options.fingerprint_prefixes);
     AddOptionalSwitch("--shared-lib", "Generates a shared Android runtime library.",
         &shared_lib_);
     AddOptionalSwitch("--static-lib", "Generate a static Android library.", &static_lib_);

tools/aapt2/dump/DumpManifest.cpp

@@ -2120,6 +2120,33 @@ class InputType : public ManifestExtractor::Element {
   }
 };
 
+/** Represents <install-constraints> elements. **/
+class InstallConstraints : public ManifestExtractor::Element {
+ public:
+  InstallConstraints() = default;
+  std::vector<std::string> fingerprint_prefixes;
+
+  void Extract(xml::Element* element) override {
+    for (xml::Element* child : element->GetChildElements()) {
+      if (child->name == "fingerprint-prefix") {
+        xml::Attribute* attr = child->FindAttribute(kAndroidNamespace, "value");
+        if (attr) {
+          fingerprint_prefixes.push_back(attr->value);
+        }
+      }
+    }
+  }
+
+  void Print(text::Printer* printer) override {
+    if (!fingerprint_prefixes.empty()) {
+      printer->Print(StringPrintf("install-constraints:\n"));
+      for (const auto& prefix : fingerprint_prefixes) {
+        printer->Print(StringPrintf("  fingerprint-prefix='%s'\n", prefix.c_str()));
+      }
+    }
+  }
+};
+
 /** Represents <original-package> elements. **/
 class OriginalPackage : public ManifestExtractor::Element {
  public:
@@ -2869,7 +2896,7 @@ template <typename T>
 constexpr const char* GetExpectedTagForType() {
   // This array does not appear at runtime, as GetExpectedTagForType function is used by compiler
   // to inject proper 'expected_tag' into ElementCast.
-  std::array<std::pair<const char*, bool>, 37> tags = {
+  std::array<std::pair<const char*, bool>, 38> tags = {
       std::make_pair("action", std::is_same<Action, T>::value),
       std::make_pair("activity", std::is_same<Activity, T>::value),
       std::make_pair("additional-certificate", std::is_same<AdditionalCertificate, T>::value),
@@ -2878,6 +2905,7 @@ constexpr const char* GetExpectedTagForType() {
       std::make_pair("compatible-screens", std::is_same<CompatibleScreens, T>::value),
       std::make_pair("feature-group", std::is_same<FeatureGroup, T>::value),
       std::make_pair("input-type", std::is_same<InputType, T>::value),
+      std::make_pair("install-constraints", std::is_same<InstallConstraints, T>::value),
       std::make_pair("intent-filter", std::is_same<IntentFilter, T>::value),
       std::make_pair("meta-data", std::is_same<MetaData, T>::value),
       std::make_pair("manifest", std::is_same<Manifest, T>::value),
@@ -2948,6 +2976,7 @@ std::unique_ptr<ManifestExtractor::Element> ManifestExtractor::Element::Inflate(
           {"compatible-screens", &CreateType<CompatibleScreens>},
           {"feature-group", &CreateType<FeatureGroup>},
           {"input-type", &CreateType<InputType>},
+          {"install-constraints", &CreateType<InstallConstraints>},
           {"intent-filter", &CreateType<IntentFilter>},
           {"manifest", &CreateType<Manifest>},
           {"meta-data", &CreateType<MetaData>},

tools/aapt2/link/ManifestFixer.cpp

@@ -749,6 +749,23 @@ bool ManifestFixer::Consume(IAaptContext* context, xml::XmlResource* doc) {
     attr->value = options_.compile_sdk_version_codename.value();
   }
 
+  if (!options_.fingerprint_prefixes.empty()) {
+    xml::Element* install_constraints_el = root->FindChild({}, "install-constraints");
+    if (install_constraints_el == nullptr) {
+      std::unique_ptr<xml::Element> install_constraints = std::make_unique<xml::Element>();
+      install_constraints->name = "install-constraints";
+      install_constraints_el = install_constraints.get();
+      root->AppendChild(std::move(install_constraints));
+    }
+    for (const std::string& prefix : options_.fingerprint_prefixes) {
+      std::unique_ptr<xml::Element> prefix_el = std::make_unique<xml::Element>();
+      prefix_el->name = "fingerprint-prefix";
+      xml::Attribute* attr = prefix_el->FindOrCreateAttribute(xml::kSchemaAndroid, "value");
+      attr->value = prefix;
+      install_constraints_el->AppendChild(std::move(prefix_el));
+    }
+  }
+
   xml::XmlActionExecutor executor;
   if (!BuildRules(&executor, context->GetDiagnostics())) {
     return false;

tools/aapt2/link/ManifestFixer.h

@@ -18,11 +18,10 @@
 #define AAPT_LINK_MANIFESTFIXER_H
 
 #include <string>
+#include <vector>
 
 #include "android-base/macros.h"
-
 #include "process/IResourceTableConsumer.h"
-
 #include "xml/XmlActionExecutor.h"
 #include "xml/XmlDom.h"
 
@@ -75,6 +74,9 @@ struct ManifestFixerOptions {
   // 'android:compileSdkVersionCodename' in the <manifest> tag.
   std::optional<std::string> compile_sdk_version_codename;
 
+  // The fingerprint prefixes to be added to the <install-constraints> tag.
+  std::vector<std::string> fingerprint_prefixes;
+
   // Whether validation errors should be treated only as warnings. If this is 'true', then an
   // incorrect node will not result in an error, but only as a warning, and the parsing will
   // continue.

tools/aapt2/link/ManifestFixer_test.cpp

@@ -965,6 +965,63 @@ TEST_F(ManifestFixerTest, UnexpectedElementsInManifest) {
   ASSERT_THAT(manifest, IsNull());
 }
 
+TEST_F(ManifestFixerTest, InsertFingerprintPrefixIfNotExist) {
+  std::string input = R"(
+      <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="android">
+      </manifest>)";
+  ManifestFixerOptions options;
+  options.fingerprint_prefixes = {"foo", "bar"};
+
+  std::unique_ptr<xml::XmlResource> manifest = VerifyWithOptions(input, options);
+  ASSERT_THAT(manifest, NotNull());
+  xml::Element* install_constraints = manifest->root.get()->FindChild({}, "install-constraints");
+  ASSERT_THAT(install_constraints, NotNull());
+  std::vector<xml::Element*> fingerprint_prefixes = install_constraints->GetChildElements();
+  EXPECT_EQ(fingerprint_prefixes.size(), 2);
+  xml::Attribute* attr;
+  EXPECT_THAT(fingerprint_prefixes[0]->name, StrEq("fingerprint-prefix"));
+  attr = fingerprint_prefixes[0]->FindAttribute(xml::kSchemaAndroid, "value");
+  ASSERT_THAT(attr, NotNull());
+  EXPECT_THAT(attr->value, StrEq("foo"));
+  EXPECT_THAT(fingerprint_prefixes[1]->name, StrEq("fingerprint-prefix"));
+  attr = fingerprint_prefixes[1]->FindAttribute(xml::kSchemaAndroid, "value");
+  ASSERT_THAT(attr, NotNull());
+  EXPECT_THAT(attr->value, StrEq("bar"));
+}
+
+TEST_F(ManifestFixerTest, AppendFingerprintPrefixIfExists) {
+  std::string input = R"(
+      <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="android">
+          <install-constraints>
+            <fingerprint-prefix android:value="foo" />
+          </install-constraints>
+      </manifest>)";
+  ManifestFixerOptions options;
+  options.fingerprint_prefixes = {"bar", "baz"};
+
+  std::unique_ptr<xml::XmlResource> manifest = VerifyWithOptions(input, options);
+  ASSERT_THAT(manifest, NotNull());
+  xml::Element* install_constraints = manifest->root.get()->FindChild({}, "install-constraints");
+  ASSERT_THAT(install_constraints, NotNull());
+  std::vector<xml::Element*> fingerprint_prefixes = install_constraints->GetChildElements();
+  EXPECT_EQ(fingerprint_prefixes.size(), 3);
+  xml::Attribute* attr;
+  EXPECT_THAT(fingerprint_prefixes[0]->name, StrEq("fingerprint-prefix"));
+  attr = fingerprint_prefixes[0]->FindAttribute(xml::kSchemaAndroid, "value");
+  ASSERT_THAT(attr, NotNull());
+  EXPECT_THAT(attr->value, StrEq("foo"));
+  EXPECT_THAT(fingerprint_prefixes[1]->name, StrEq("fingerprint-prefix"));
+  attr = fingerprint_prefixes[1]->FindAttribute(xml::kSchemaAndroid, "value");
+  ASSERT_THAT(attr, NotNull());
+  EXPECT_THAT(attr->value, StrEq("bar"));
+  EXPECT_THAT(fingerprint_prefixes[2]->name, StrEq("fingerprint-prefix"));
+  attr = fingerprint_prefixes[2]->FindAttribute(xml::kSchemaAndroid, "value");
+  ASSERT_THAT(attr, NotNull());
+  EXPECT_THAT(attr->value, StrEq("baz"));
+}
+
 TEST_F(ManifestFixerTest, UsesLibraryMustHaveNonEmptyName) {
   std::string input = R"(
       <manifest xmlns:android="http://schemas.android.com/apk/res/android"