Fix more Unicode bugs

src/main/java/com/google/devtools/build/lib/analysis/BUILD

@@ -1477,6 +1477,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/actions:artifacts",
         "//src/main/java/com/google/devtools/build/lib/actions:commandline_item",
         "//src/main/java/com/google/devtools/build/lib/collect/nestedset",
+        "//src/main/java/com/google/devtools/build/lib/unsafe:string",
         "//src/main/java/com/google/devtools/build/lib/util",
         "//src/main/java/net/starlark/java/eval",
         "//third_party:jsr305",
@@ -1493,6 +1494,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/actions:artifact_expander",
         "//src/main/java/com/google/devtools/build/lib/actions:artifacts",
         "//src/main/java/com/google/devtools/build/lib/collect/nestedset",
+        "//src/main/java/com/google/devtools/build/lib/unsafe:string",
         "//src/main/java/com/google/devtools/build/lib/util",
         "//third_party:guava",
         "//third_party:jsr305",

src/main/java/com/google/devtools/build/lib/analysis/ConfiguredRuleClassProvider.java

@@ -53,6 +53,7 @@
 import com.google.devtools.build.lib.packages.RuleTransitionData;
 import com.google.devtools.build.lib.packages.WorkspaceFactory;
 import com.google.devtools.build.lib.starlarkbuildapi.core.Bootstrap;
+import com.google.devtools.build.lib.unsafe.StringUnsafe;
 import com.google.devtools.build.lib.vfs.DigestHashFunction;
 import com.google.devtools.build.lib.vfs.Path;
 import com.google.devtools.build.lib.vfs.PathFragment;
@@ -131,7 +132,10 @@ protected synchronized byte[] getFastDigest(PathFragment path) {
 
     @Override
     protected synchronized byte[] getDigest(PathFragment path) {
-      return getDigestFunction().getHashFunction().hashString(path.toString(), UTF_8).asBytes();
+      return getDigestFunction()
+          .getHashFunction()
+          .hashBytes(StringUnsafe.getInstance().getInternalStringBytes(path.getPathString()))
+          .asBytes();
     }
   }
 

src/main/java/com/google/devtools/build/lib/analysis/RepoMappingManifestAction.java

@@ -16,7 +16,6 @@
 import static com.google.common.collect.ImmutableList.toImmutableList;
 import static com.google.common.collect.ImmutableSortedMap.toImmutableSortedMap;
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
-import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Comparator.comparing;
 
 import com.github.benmanes.caffeine.cache.Caffeine;
@@ -146,7 +145,7 @@ protected void computeKey(
   public String getFileContents(@Nullable EventHandler eventHandler) throws IOException {
     ByteArrayOutputStream stream = new ByteArrayOutputStream();
     newDeterministicWriter().writeOutputFile(stream);
-    return stream.toString(UTF_8);
+    return stream.toString(ISO_8859_1);
   }
 
   @Override

src/main/java/com/google/devtools/build/lib/analysis/SourceManifestAction.java

@@ -15,7 +15,6 @@
 
 import static com.google.common.collect.ImmutableList.toImmutableList;
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
-import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.ImmutableList;
@@ -213,7 +212,7 @@ public void writeOutputFile(OutputStream out, @Nullable EventHandler eventHandle
   public String getFileContents(@Nullable EventHandler eventHandler) throws IOException {
     ByteArrayOutputStream stream = new ByteArrayOutputStream();
     writeOutputFile(stream, eventHandler);
-    return stream.toString(UTF_8);
+    return stream.toString(ISO_8859_1);
   }
 
   @Override

src/main/java/com/google/devtools/build/lib/analysis/actions/LazyWriteNestedSetOfTupleAction.java

@@ -14,7 +14,6 @@
 
 package com.google.devtools.build.lib.analysis.actions;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.google.devtools.build.lib.actions.ActionExecutionContext;
 import com.google.devtools.build.lib.actions.ActionKeyContext;
@@ -25,6 +24,7 @@
 import com.google.devtools.build.lib.collect.nestedset.NestedSet;
 import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
 import com.google.devtools.build.lib.collect.nestedset.Order;
+import com.google.devtools.build.lib.unsafe.StringUnsafe;
 import com.google.devtools.build.lib.util.Fingerprint;
 import javax.annotation.Nullable;
 import net.starlark.java.eval.Tuple;
@@ -49,7 +49,8 @@ public LazyWriteNestedSetOfTupleAction(
 
   @Override
   public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx) {
-    return out -> out.write(getContents(delimiter).getBytes(UTF_8));
+    return out ->
+        out.write(StringUnsafe.getInstance().getInternalStringBytes(getContents(delimiter)));
   }
 
   /** Computes the Action key for this action by computing the fingerprint for the file contents. */

src/main/java/com/google/devtools/build/lib/analysis/actions/LazyWritePathsFileAction.java

@@ -15,7 +15,6 @@
 
 package com.google.devtools.build.lib.analysis.actions;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.devtools.build.lib.actions.ActionExecutionContext;
@@ -26,6 +25,7 @@
 import com.google.devtools.build.lib.collect.nestedset.NestedSet;
 import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
 import com.google.devtools.build.lib.collect.nestedset.Order;
+import com.google.devtools.build.lib.unsafe.StringUnsafe;
 import com.google.devtools.build.lib.util.Fingerprint;
 import java.util.function.Function;
 import javax.annotation.Nullable;
@@ -71,7 +71,7 @@ public LazyWritePathsFileAction(
 
   @Override
   public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx) {
-    return out -> out.write(getContents().getBytes(UTF_8));
+    return out -> out.write(StringUnsafe.getInstance().getInternalStringBytes(getContents()));
   }
 
   /** Computes the Action key for this action by computing the fingerprint for the file contents. */

src/main/java/com/google/devtools/build/lib/analysis/actions/LocalTemplateExpansionStrategy.java

@@ -14,7 +14,7 @@
 
 package com.google.devtools.build.lib.analysis.actions;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
 
 import com.google.common.collect.ImmutableList;
 import com.google.devtools.build.lib.actions.AbstractAction;
@@ -47,7 +47,8 @@ public ImmutableList<SpawnResult> expandTemplate(
       final String expandedTemplate =
           getExpandedTemplateUnsafe(
               templateMetadata.template(), templateMetadata.substitutions(), ctx.getPathResolver());
-      DeterministicWriter deterministicWriter = out -> out.write(expandedTemplate.getBytes(UTF_8));
+      DeterministicWriter deterministicWriter =
+          out -> out.write(expandedTemplate.getBytes(ISO_8859_1));
       return ctx.getContext(FileWriteActionContext.class)
           .writeOutputToFile(
               action,

src/main/java/com/google/devtools/build/lib/analysis/actions/StarlarkAction.java

@@ -13,7 +13,7 @@
 // limitations under the License.
 package com.google.devtools.build.lib.analysis.actions;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.ImmutableMap;
@@ -349,10 +349,13 @@ protected void afterExecute(
       for (Artifact input : allInputs.toList()) {
         usedInputsByMappedPath.put(pathMapper.getMappedExecPathString(input), input);
       }
+      // Bazel encodes file system paths as raw bytes stored in a Latin-1 encoded string, so we need
+      // to make sure to also decode the unused input list as Latin-1.
       try (BufferedReader br =
           new BufferedReader(
               new InputStreamReader(
-                  getUnusedInputListInputStream(actionExecutionContext, spawnResults), UTF_8))) {
+                  getUnusedInputListInputStream(actionExecutionContext, spawnResults),
+                  ISO_8859_1))) {
         String line;
         while ((line = br.readLine()) != null) {
           line = line.trim();

src/main/java/com/google/devtools/build/lib/analysis/actions/Template.java

@@ -14,6 +14,8 @@
 
 package com.google.devtools.build.lib.analysis.actions;
 
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+
 import com.google.common.annotations.VisibleForTesting;
 import com.google.devtools.build.lib.actions.Artifact;
 import com.google.devtools.build.lib.actions.ArtifactPathResolver;
@@ -22,16 +24,12 @@
 import com.google.devtools.build.lib.vfs.FileSystemUtils;
 import com.google.devtools.build.lib.vfs.Path;
 import java.io.IOException;
-import java.nio.charset.Charset;
-import java.nio.charset.StandardCharsets;
 import javax.annotation.Nullable;
 
 /** A template that contains text content, or alternatively throws an {@link IOException}. */
 @Immutable // all subclasses are immutable
 public abstract class Template {
 
-  static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
-
   /** We only allow subclasses in this file. */
   private Template() {}
 
@@ -105,7 +103,8 @@ private static final class ArtifactTemplate extends Template {
     public String getContent(ArtifactPathResolver resolver) throws IOException {
       Path templatePath = resolver.toPath(templateArtifact);
       try {
-        return FileSystemUtils.readContent(templatePath, DEFAULT_CHARSET);
+        // Bazel's internal encoding for strings is raw bytes as Latin-1
+        return FileSystemUtils.readContent(templatePath, ISO_8859_1);
       } catch (IOException e) {
         throw new IOException(
             "failed to load template file '"

src/main/java/com/google/devtools/build/lib/analysis/starlark/StarlarkActionFactory.java

@@ -977,13 +977,8 @@ public void expandTemplate(
     ImmutableMap.Builder<String, Substitution> substitutionsBuilder = ImmutableMap.builder();
     for (Map.Entry<String, String> substitution :
         Dict.cast(substitutionsUnchecked, String.class, String.class, "substitutions").entrySet()) {
-      // Blaze calls ParserInput.fromLatin1 when reading BUILD files, which might
-      // contain UTF-8 encoded symbols as part of template substitution.
-      // As a quick fix, the substitution values are corrected before being passed on.
-      // In the long term, avoiding ParserInput.fromLatin would be a better approach.
       substitutionsBuilder.put(
-          substitution.getKey(),
-          Substitution.of(substitution.getKey(), convertLatin1ToUtf8(substitution.getValue())));
+          substitution.getKey(), Substitution.of(substitution.getKey(), substitution.getValue()));
     }
     if (!Starlark.UNBOUND.equals(computedSubstitutions)) {
       for (Substitution substitution : ((TemplateDict) computedSubstitutions).getAll()) {
@@ -1007,16 +1002,6 @@ public void expandTemplate(
     registerAction(action);
   }
 
-  /**
-   * Returns the proper UTF-8 representation of a String that was erroneously read using Latin1.
-   *
-   * @param latin1 Input string
-   * @return The input string, UTF8 encoded
-   */
-  private static String convertLatin1ToUtf8(String latin1) {
-    return new String(latin1.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
-  }
-
   @Override
   public Args args(StarlarkThread thread) {
     return Args.newArgs(thread.mutability(), getSemantics());

src/main/java/com/google/devtools/build/lib/authandtls/BUILD

@@ -21,6 +21,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/authandtls/credentialhelper",
         "//src/main/java/com/google/devtools/build/lib/concurrent",
         "//src/main/java/com/google/devtools/build/lib/events",
+        "//src/main/java/com/google/devtools/build/lib/unsafe:string",
         "//src/main/java/com/google/devtools/build/lib/vfs",
         "//src/main/java/com/google/devtools/common/options",
         "//third_party:auth",

src/main/java/com/google/devtools/build/lib/authandtls/BasicHttpAuthenticationEncoder.java

@@ -13,8 +13,7 @@
 // limitations under the License.
 package com.google.devtools.build.lib.authandtls;
 
-import com.google.common.base.Strings;
-import java.nio.charset.Charset;
+import com.google.devtools.build.lib.unsafe.StringUnsafe;
 import java.util.Base64;
 
 /**
@@ -26,16 +25,18 @@ public final class BasicHttpAuthenticationEncoder {
 
   private BasicHttpAuthenticationEncoder() {}
 
-  /** Encode username and password into a token with given {@link Charset}. */
-  public static String encode(String username, String password, Charset charset) {
-    StringBuilder sb = new StringBuilder();
-    if (!Strings.isNullOrEmpty(username)) {
-      sb.append(username);
-    }
-    sb.append(":");
-    if (!Strings.isNullOrEmpty(password)) {
-      sb.append(password);
-    }
-    return "Basic " + Base64.getEncoder().encodeToString(sb.toString().getBytes(charset));
+  /**
+   * Encode username and password into a token.
+   *
+   * <p>username and password are expected to use Bazel's internal string encoding. The returned
+   * string is a regular Unicode string.
+   */
+  public static String encode(String username, String password) {
+    // The raw bytes in the internal string are assumed to be UTF-8, which is the encoding used for
+    // basic authentication.
+    return "Basic "
+        + Base64.getEncoder()
+            .encodeToString(
+                StringUnsafe.getInstance().getInternalStringBytes(username + ":" + password));
   }
 }

src/main/java/com/google/devtools/build/lib/authandtls/NetrcCredentials.java

@@ -13,8 +13,6 @@
 // limitations under the License.
 package com.google.devtools.build.lib.authandtls;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
-
 import com.google.auth.Credentials;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
@@ -58,7 +56,7 @@ public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException
     Credential credential = netrc.getCredential(uri.getHost());
     if (credential != null) {
       String token =
-          BasicHttpAuthenticationEncoder.encode(credential.login(), credential.password(), UTF_8);
+          BasicHttpAuthenticationEncoder.encode(credential.login(), credential.password());
       return ImmutableMap.of("Authorization", ImmutableList.of(token));
     } else {
       return ImmutableMap.of();

src/main/java/com/google/devtools/build/lib/authandtls/NetrcParser.java

@@ -14,7 +14,7 @@
 package com.google.devtools.build.lib.authandtls;
 
 import static com.google.common.base.Predicates.not;
-import static java.nio.charset.StandardCharsets.UTF_8;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
 import static java.util.Objects.requireNonNull;
 
 import com.google.common.base.Strings;
@@ -77,7 +77,7 @@ private static class TokenStream implements Closeable {
     private final Queue<Token> tokens = new ArrayDeque<>();
 
     TokenStream(InputStream inputStream) throws IOException {
-      bufferedReader = new BufferedReader(new InputStreamReader(inputStream, UTF_8));
+      bufferedReader = new BufferedReader(new InputStreamReader(inputStream, ISO_8859_1));
       processLine();
     }
 
@@ -183,8 +183,7 @@ private static Credential parseCredentialForMachine(TokenStream tokenStream, Str
     while (!done && tokenStream.hasNext()) {
       // Peek rather than taking next token since we probably won't process it
       Token token = tokenStream.peek();
-      if (token instanceof ItemToken itemToken) {
-        String item = itemToken.item();
+      if (token instanceof ItemToken(String item)) {
         switch (item) {
           case LOGIN -> {
             tokenStream.next();

src/main/java/com/google/devtools/build/lib/bazel/bzlmod/BUILD

@@ -262,6 +262,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/skyframe:package_lookup_function",
         "//src/main/java/com/google/devtools/build/lib/skyframe:package_lookup_value",
         "//src/main/java/com/google/devtools/build/lib/skyframe:precomputed_value",
+        "//src/main/java/com/google/devtools/build/lib/util:string_encoding",
         "//src/main/java/com/google/devtools/build/lib/vfs",
         "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",
         "//src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs",

src/main/java/com/google/devtools/build/lib/bazel/bzlmod/VendorFileFunction.java

@@ -14,7 +14,7 @@
 
 package com.google.devtools.build.lib.bazel.bzlmod;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
 
 import com.google.common.collect.ImmutableList;
 import com.google.devtools.build.lib.actions.FileValue;
@@ -25,6 +25,7 @@
 import com.google.devtools.build.lib.packages.VendorThreadContext;
 import com.google.devtools.build.lib.rules.repository.RepositoryDelegatorFunction;
 import com.google.devtools.build.lib.skyframe.PrecomputedValue;
+import com.google.devtools.build.lib.util.StringEncoding;
 import com.google.devtools.build.lib.vfs.FileSystemUtils;
 import com.google.devtools.build.lib.vfs.Path;
 import com.google.devtools.build.lib.vfs.Root;
@@ -54,7 +55,8 @@
 public class VendorFileFunction implements SkyFunction {
 
   private static final String VENDOR_FILE_HEADER =
-      """
+      StringEncoding.unicodeToInternal(
+          """
 ###############################################################################
 # This file is used to configure how external repositories are handled in vendor mode.
 # ONLY the two following functions can be used:
@@ -67,7 +69,7 @@ public class VendorFileFunction implements SkyFunction {
 # Note that Bazel will NOT update the vendored source for this repo while running vendor command
 # unless it's unpinned. The user can modify and maintain the vendored source for this repo manually.
 ###############################################################################
-""";
+""");
 
   private final BazelStarlarkEnvironment starlarkEnv;
 
@@ -138,8 +140,7 @@ private void createVendorFile(Path vendorPath, Path vendorFilePath)
       throws VendorFileFunctionException {
     try {
       vendorPath.createDirectoryAndParents();
-      byte[] vendorFileContents = VENDOR_FILE_HEADER.getBytes(UTF_8);
-      FileSystemUtils.writeContent(vendorFilePath, vendorFileContents);
+      FileSystemUtils.writeContent(vendorFilePath, ISO_8859_1, VENDOR_FILE_HEADER);
     } catch (IOException e) {
       throw new VendorFileFunctionException(
           new IOException("error creating VENDOR.bazel file", e), Transience.TRANSIENT);