Split CelEncoderExtensions into CelEncoderCompilerLibrary and CelEncoderRuntimeLibrary to allow its usage in Lite runtime.

extensions/BUILD.bazel

@@ -102,3 +102,20 @@ java_library(
     visibility = ["//:internal"],
     exports = ["//extensions/src/main/java/dev/cel/extensions:bindings"],
 )
+
+java_library(
+    name = "encoders_compiler_library",
+    visibility = ["//:internal"],
+    exports = ["//extensions/src/main/java/dev/cel/extensions:encoders_compiler_library"],
+)
+
+java_library(
+    name = "encoders_runtime_library",
+    visibility = ["//:internal"],
+    exports = ["//extensions/src/main/java/dev/cel/extensions:encoders_runtime_library"],
+)
+
+cel_android_library(
+    name = "encoders_runtime_library_android",
+    exports = ["//extensions/src/main/java/dev/cel/extensions:encoders_runtime_library_android"],
+)

extensions/src/main/java/dev/cel/extensions/BUILD.bazel

@@ -236,17 +236,18 @@ java_library(
     ],
 )
 
+# build_cleaner: disable=deps
 java_library(
     name = "encoders",
     srcs = ["CelEncoderExtensions.java"],
     deps = [
+        ":encoders_compiler_library",
+        ":encoders_runtime_library",
+        ":extension_library",
         "//checker:checker_builder",
-        "//common:compiler_common",
+        "//common:cel_function_decl",
         "//common:options",
-        "//common/types",
-        "//common/values:cel_byte_string",
         "//compiler:compiler_builder",
-        "//extensions:extension_library",
         "//runtime",
         "//runtime:function_binding",
         "@maven//:com_google_errorprone_error_prone_annotations",
@@ -255,6 +256,51 @@ java_library(
     ],
 )
 
+java_library(
+    name = "encoders_compiler_library",
+    srcs = ["CelEncoderCompilerLibrary.java"],
+    tags = [
+    ],
+    deps = [
+        ":extension_library",
+        "//checker:checker_builder",
+        "//common:cel_function_decl",
+        "//common:cel_overload_decl",
+        "//common/types",
+        "//compiler:compiler_builder",
+        "@maven//:com_google_errorprone_error_prone_annotations",
+        "@maven//:com_google_guava_guava",
+    ],
+)
+
+java_library(
+    name = "encoders_runtime_library",
+    srcs = ["CelEncoderRuntimeLibrary.java"],
+    tags = [
+    ],
+    deps = [
+        "//common/values:cel_byte_string",
+        "//runtime:function_binding",
+        "//runtime:lite_runtime",
+        "@maven//:com_google_errorprone_error_prone_annotations",
+        "@maven//:com_google_guava_guava",
+    ],
+)
+
+cel_android_library(
+    name = "encoders_runtime_library_android",
+    srcs = ["CelEncoderRuntimeLibrary.java"],
+    tags = [
+    ],
+    deps = [
+        "//common/values:cel_byte_string",
+        "//runtime:function_binding_android",
+        "//runtime:lite_runtime_android",
+        "@maven//:com_google_errorprone_error_prone_annotations",
+        "@maven_android//:com_google_guava_guava",
+    ],
+)
+
 java_library(
     name = "optional_library",
     srcs = ["CelOptionalLibrary.java"],

extensions/src/main/java/dev/cel/extensions/CelEncoderCompilerLibrary.java

@@ -0,0 +1,131 @@
+// Copyright 2023 Google LLC
+//
+// 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
+//
+//      https://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 dev.cel.extensions;
+
+import static com.google.common.collect.ImmutableSet.toImmutableSet;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.errorprone.annotations.Immutable;
+import dev.cel.checker.CelCheckerBuilder;
+import dev.cel.common.CelFunctionDecl;
+import dev.cel.common.CelOverloadDecl;
+import dev.cel.common.types.SimpleType;
+import dev.cel.compiler.CelCompilerLibrary;
+import java.util.Set;
+
+/** Internal implementation of CEL Encoder compile-time extensions. */
+@Immutable
+public final class CelEncoderCompilerLibrary
+    implements CelCompilerLibrary, CelExtensionLibrary.FeatureSet {
+
+  /** Enumeration of functions for Encoder compile-time extension. */
+  public enum Function {
+    DECODE(
+        CelFunctionDecl.newFunctionDeclaration(
+            "base64.decode",
+            CelOverloadDecl.newGlobalOverload(
+                "base64_decode_string", SimpleType.BYTES, SimpleType.STRING))),
+    ENCODE(
+        CelFunctionDecl.newFunctionDeclaration(
+            "base64.encode",
+            CelOverloadDecl.newGlobalOverload(
+                "base64_encode_bytes", SimpleType.STRING, SimpleType.BYTES)));
+
+    private final CelFunctionDecl functionDecl;
+
+    public String getFunction() {
+      return functionDecl.name();
+    }
+
+    public CelFunctionDecl getFunctionDecl() {
+      return functionDecl;
+    }
+
+    Function(CelFunctionDecl functionDecl) {
+      this.functionDecl = functionDecl;
+    }
+  }
+
+  private static final class Library implements CelExtensionLibrary<CelEncoderCompilerLibrary> {
+    private final CelEncoderCompilerLibrary version0;
+
+    Library() {
+      version0 = new CelEncoderCompilerLibrary(0, ImmutableSet.copyOf(Function.values()));
+    }
+
+    @Override
+    public String name() {
+      return "encoders";
+    }
+
+    @Override
+    public ImmutableSet<CelEncoderCompilerLibrary> versions() {
+      return ImmutableSet.of(version0);
+    }
+  }
+
+  private static final Library LIBRARY = new Library();
+
+  public static CelExtensionLibrary<CelEncoderCompilerLibrary> library() {
+    return LIBRARY;
+  }
+
+  /** Returns the latest version of the 'encoders' compiler extension. */
+  public static CelEncoderCompilerLibrary encoders() {
+    return library().latest();
+  }
+
+  /** Returns the specified version of the 'encoders' compiler extension. */
+  public static CelEncoderCompilerLibrary encoders(int version) {
+    return library().version(version);
+  }
+
+  /** Returns the 'encoders' compiler extension with only the specified functions. */
+  public static CelEncoderCompilerLibrary encoders(Function... functions) {
+    return encoders(ImmutableSet.copyOf(functions));
+  }
+
+  /** Returns the 'encoders' compiler extension with only the specified functions. */
+  public static CelEncoderCompilerLibrary encoders(Set<Function> functions) {
+    return new CelEncoderCompilerLibrary(functions);
+  }
+
+  private final ImmutableSet<Function> functions;
+  private final int version;
+
+  CelEncoderCompilerLibrary(Set<Function> functions) {
+    this(-1, functions);
+  }
+
+  private CelEncoderCompilerLibrary(int version, Set<Function> functions) {
+    this.version = version;
+    this.functions = ImmutableSet.copyOf(functions);
+  }
+
+  @Override
+  public int version() {
+    return version;
+  }
+
+  @Override
+  public ImmutableSet<CelFunctionDecl> functions() {
+    return functions.stream().map(Function::getFunctionDecl).collect(toImmutableSet());
+  }
+
+  @Override
+  public void setCheckerOptions(CelCheckerBuilder checkerBuilder) {
+    functions.forEach(function -> checkerBuilder.addFunctionDeclarations(function.functionDecl));
+  }
+}