// Copyright 2023, The Android Open Source Project
//
// 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.

// Rust bindgen wrappers to allow calling into libavb from Rust.
//
// The auto-generated wrappers are Rust unsafe and somewhat difficult to work
// with so are not exposed outside of this directory; instead we will provide
// a safe higher-level Rust API.
rust_defaults {
    name: "libavb_bindgen.common.defaults",
    wrapper_src: "bindgen/avb.h",
    crate_name: "avb_bindgen",
    edition: "2021",
    visibility: [
        ":__subpackages__",
        // TODO(b/290110273): add the Rust public API layer here and adjust
        // Virtualization packages to depend on it instead of the raw bindgen.
        "//packages/modules/Virtualization:__subpackages__",
    ],
    source_stem: "bindings",
    bindgen_flags: [
        "--constified-enum-module=AvbDescriptorTag",
        "--bitfield-enum=Avb.*Flags",
        "--default-enum-style rust",
        "--with-derive-default",
        "--with-derive-custom=Avb.*Descriptor=FromZeroes,FromBytes",
        "--with-derive-custom=AvbCertPermanentAttributes=FromZeroes,FromBytes,AsBytes",
        "--with-derive-custom=AvbCertCertificate.*=FromZeroes,FromBytes,AsBytes",
        "--with-derive-custom=AvbCertUnlock.*=FromZeroes,FromBytes,AsBytes",
        "--allowlist-type=AvbDescriptorTag",
        "--allowlist-type=Avb.*Flags",
        "--allowlist-function=.*",
        "--allowlist-var=AVB.*",
        "--use-core",
        "--raw-line=#![no_std]",
        "--raw-line=use zerocopy::{AsBytes, FromBytes, FromZeroes};",
        "--ctypes-prefix=core::ffi",
    ],
    cflags: ["-DBORINGSSL_NO_CXX"],
}

// Full bindgen defaults for std targets.
rust_defaults {
    name: "libavb_bindgen.std.defaults",
    defaults: ["libavb_bindgen.common.defaults"],
    host_supported: true,
    static_libs: ["libavb_cert"],
    shared_libs: ["libcrypto"],
    rustlibs: ["libzerocopy"],
    apex_available: ["com.android.virt"],
}

// Full bindgen default for nostd targets.
rust_defaults {
    name: "libavb_bindgen.nostd.defaults",
    defaults: ["libavb_bindgen.common.defaults"],
    static_libs: [
        "libavb_cert_baremetal",
        "libcrypto_baremetal",
    ],
    rustlibs: ["libzerocopy_nostd_noalloc"],
}

// Internal source-only bindgen with std.
//
// This target should only be used as `srcs`, not `rustlibs` or `rlibs`. This
// is because the `rust_bindgen` rule intentionally only generates rlibs
// (b/166332519), and also forces its dependencies to use rlibs. However, this
// can create mismatched library types if the depenency is also used elsewhere
// in a build rule as a dylib. In particular for us, libzerocopy and its own
// dependency libbyteorder trigger this problem like so:
//
//              build target (prefer dylib)
//                  /                 \
//          libavb_rs (dylib)          \
//               /                      \
//       libavb_bindgen (rlib)    ... arbitrary dependency chain (dylib) ...
//            /                             \
//     libzerocopy (rlib)                    \
//         /                                  \
//   libbyteorder (rlib)               libbyteorder (dylib)
//
// By using it as a `srcs` instead, we can wrap it in a `rust_library` which
// allows selecting either library type and fixes the conflict:
//
//              build target (prefer dylib)
//                  /                 \
//          libavb_rs (dylib)          \
//               /                      \
//       libavb_bindgen (dylib)    ... arbitrary dependency chain (dylib) ...
//            /                         /
//     libzerocopy (dylib)             /
//                 \                  /
//                  libbyteorder (dylib)
//
rust_bindgen {
    name: "libavb_bindgen_for_srcs_only",
    defaults: ["libavb_bindgen.std.defaults"],
}

// Bindgen with std.
//
// See above for why we need a `rust_library` wrapper here.
rust_library {
    name: "libavb_bindgen",
    defaults: ["libavb_bindgen.std.defaults"],
    srcs: [":libavb_bindgen_for_srcs_only"],
}

// Bindgen nostd.
//
// Nostd targets always use rlibs, so we don't need a `rust_library` wrapper in
// this case; the rlib-only bindgen target is sufficient.
rust_bindgen {
    name: "libavb_bindgen_nostd",
    defaults: ["libavb_bindgen.nostd.defaults"],
}

// Bindgen auto-generated tests.
rust_test {
    name: "libavb_bindgen_test",
    srcs: [":libavb_bindgen_for_srcs_only"],
    crate_name: "avb_bindgen_test",
    edition: "2021",
    test_suites: ["general-tests"],
    auto_gen_config: true,
    clippy_lints: "none",
    lints: "none",
    rustlibs: ["libzerocopy"],
}

// Rust library wrapping libavb C implementation.

// Common defaults for all variations.
rust_defaults {
    name: "libavb_rs_common.defaults",
    crate_name: "avb",
    srcs: ["src/lib.rs"],
    clippy_lints: "android",
    lints: "android",
}

// No std, no features.
rust_defaults {
    name: "libavb_rs_nostd.defaults",
    defaults: ["libavb_rs_common.defaults"],
    // Only rlib can build without the required nostd hooks (eh_personality,
    // panic_handler, etc) to defer them for the final binary to implement.
    prefer_rlib: true,
    no_stdlibs: true,
    rustlibs: [
        "libavb_bindgen_nostd",
        "libzerocopy_nostd_noalloc",
    ],
    whole_static_libs: [
        "libavb_cert_baremetal",
    ],
    stdlibs: [
        "libcore.rust_sysroot",
    ],
}

// Std, no features.
rust_defaults {
    name: "libavb_rs.defaults",
    defaults: ["libavb_rs_common.defaults"],
    host_supported: true,
    rustlibs: [
        "libavb_bindgen",
        "libzerocopy",
    ],
    whole_static_libs: [
        "libavb_cert",
    ],
}

// Adds UUID feature for nostd.
rust_defaults {
    name: "libavb_rs_nostd.uuid.defaults",
    features: [
        "uuid",
    ],
    rustlibs: [
        "libuuid_nostd",
    ],
}

// Adds UUID feature for std.
rust_defaults {
    name: "libavb_rs.uuid.defaults",
    features: [
        "uuid",
    ],
    rustlibs: [
        "libuuid",
    ],
}

// lib: no std, no features.
rust_library_rlib {
    name: "libavb_rs_nostd",
    defaults: ["libavb_rs_nostd.defaults"],
}

// lib: no std, UUID feature.
rust_library_rlib {
    name: "libavb_rs_nostd_uuid",
    defaults: [
        "libavb_rs_nostd.defaults",
        "libavb_rs_nostd.uuid.defaults",
    ],
}

// lib: std, no features.
rust_library {
    name: "libavb_rs",
    defaults: ["libavb_rs.defaults"],
}

// lib: std, UUID feature.
rust_library {
    name: "libavb_rs_uuid",
    defaults: [
        "libavb_rs.defaults",
        "libavb_rs.uuid.defaults",
    ],
}

// TestOps lib: std
rust_library {
    crate_name: "avb_test",
    name: "libavb_test_rs_testops",
    srcs: ["tests/test_ops.rs"],
    clippy_lints: "android",
    lints: "android",
    host_supported: true,
    rustlibs: [
        "libavb_rs",
    ],
    whole_static_libs: [
        "libavb_cert",
    ],
}

// "libavb_rs.defaults" plus additional unit test defaults.
rust_defaults {
    name: "libavb_rs_unittest.defaults",
    defaults: ["libavb_rs.defaults"],
    data: [":libavb_rs_example_descriptors"],
    test_suites: ["general-tests"],
}

// Unit tests: std, no features.
rust_test {
    name: "libavb_rs_unittest",
    defaults: ["libavb_rs_unittest.defaults"],
}

// Unit tests: std, UUID feature.
rust_test {
    name: "libavb_rs_uuid_unittest",
    defaults: [
        "libavb_rs_unittest.defaults",
        "libavb_rs.uuid.defaults",
    ],
}

// Example descriptors in binary format.
filegroup {
    name: "libavb_rs_example_descriptors",
    srcs: [
        "testdata/chain_partition_descriptor.bin",
        "testdata/hash_descriptor.bin",
        "testdata/hashtree_descriptor.bin",
        "testdata/kernel_commandline_descriptor.bin",
        "testdata/property_descriptor.bin",
    ],
}

// Integration test defaults.
rust_defaults {
    name: "libavb_rs_test.defaults",
    srcs: ["tests/tests.rs"],
    data: [
        ":avb_cert_test_permanent_attributes",
        ":avb_cert_test_unlock_challenge",
        ":avb_cert_test_unlock_credential",
        ":avb_testkey_rsa4096_pub_bin",
        ":avb_testkey_rsa8192_pub_bin",
        ":avbrs_test_image",
        ":avbrs_test_image_with_vbmeta_footer",
        ":avbrs_test_image_with_vbmeta_footer_for_boot",
        ":avbrs_test_image_with_vbmeta_footer_for_test_part_2",
        ":avbrs_test_vbmeta",
        ":avbrs_test_vbmeta_2_parts",
        ":avbrs_test_vbmeta_cert",
        ":avbrs_test_vbmeta_persistent_digest",
        ":avbrs_test_vbmeta_with_chained_partition",
        ":avbrs_test_vbmeta_with_commandline",
        ":avbrs_test_vbmeta_with_hashtree",
        ":avbrs_test_vbmeta_with_property",
    ],
    rustlibs: [
        "libhex",
        "libzerocopy",
    ],
    test_suites: ["general-tests"],
    clippy_lints: "android",
    lints: "android",
}

// Integration test: no features.
rust_test {
    name: "libavb_rs_test",
    defaults: ["libavb_rs_test.defaults"],
    rustlibs: ["libavb_rs"],
}

// Integration test: UUID feature.
rust_test {
    name: "libavb_rs_uuid_test",
    defaults: [
        "libavb_rs.uuid.defaults",
        "libavb_rs_test.defaults",
    ],
    rustlibs: ["libavb_rs_uuid"],
}

// Test images for verification.

// Unsigned 16KiB test image.
genrule {
    name: "avbrs_test_image",
    tools: ["avbtool"],
    out: ["test_image.img"],
    cmd: "$(location avbtool) generate_test_image --image_size 16384 --output $(out)",
}

// Unsigned vbmeta blob containing the test image descriptor for partition name "test_part".
avb_gen_vbmeta_image {
    name: "avbrs_test_image_descriptor",
    src: ":avbrs_test_image",
    partition_name: "test_part",
    salt: "1000",
}

// Unsigned vbmeta blob containing the test image descriptor for partition name "test_part_2".
avb_gen_vbmeta_image {
    name: "avbrs_test_image_descriptor_2",
    src: ":avbrs_test_image",
    partition_name: "test_part_2",
    salt: "1001",
}

// Unsigned vbmeta blob containing a persistent digest descriptor for partition name
// "test_part_persistent_digest".
//
// Currently this is the only in-tree usage of persistent digests, but if anyone else needs it
// later on it may be worth folding support for this into the `avb_gen_vbmeta_image` rule.
genrule {
    name: "avbrs_test_image_descriptor_persistent_digest",
    tools: ["avbtool"],
    srcs: [":avbrs_test_image"],
    out: ["avbrs_test_image_descriptor_persistent_digest.img"],
    cmd: "$(location avbtool) add_hash_footer --image $(location :avbrs_test_image) --partition_name test_part_persistent_digest --dynamic_partition_size --do_not_append_vbmeta_image --use_persistent_digest --output_vbmeta_image $(out)",
}

// Unsigned vbmeta blob containing a hastree descriptor for partition name
// "test_part_hashtree".
genrule {
    name: "avbrs_test_image_descriptor_hashtree",
    tools: ["avbtool"],
    srcs: [":avbrs_test_image"],
    out: ["avbrs_test_image_descriptor_hashtree.img"],
    // Generating FEC values requires the `fec` tool to be on $PATH, which does
    // not seems to be possible here. For now pass `--do_not_generate_fec`.
    cmd: "$(location avbtool) add_hashtree_footer --image $(location :avbrs_test_image) --partition_name test_part_hashtree --partition_size 0 --salt B000 --do_not_append_vbmeta_image --output_vbmeta_image $(out) --do_not_generate_fec",
}

// Standalone vbmeta image signing the test image descriptor.
genrule {
    name: "avbrs_test_vbmeta",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor",
        ":avb_testkey_rsa4096",
    ],
    out: ["test_vbmeta.img"],
    cmd: "$(location avbtool) make_vbmeta_image --key $(location :avb_testkey_rsa4096) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor) --output $(out)",
}

// Standalone vbmeta image signing the test image descriptor with
// `avb_cert_testkey_psk` and `avb_cert_test_metadata`.
genrule {
    name: "avbrs_test_vbmeta_cert",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor",
        ":avb_cert_test_metadata",
        ":avb_cert_testkey_psk",
    ],
    out: ["test_vbmeta_cert.img"],
    cmd: "$(location avbtool) make_vbmeta_image --key $(location :avb_cert_testkey_psk) --public_key_metadata $(location :avb_cert_test_metadata) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor) --output $(out)",
}

// Standalone vbmeta image signing the test image descriptors for "test_part" and "test_part_2".
genrule {
    name: "avbrs_test_vbmeta_2_parts",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor",
        ":avbrs_test_image_descriptor_2",
        ":avb_testkey_rsa4096",
    ],
    out: ["test_vbmeta_2_parts.img"],
    cmd: "$(location avbtool) make_vbmeta_image --key $(location :avb_testkey_rsa4096) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor) --include_descriptors_from_image $(location :avbrs_test_image_descriptor_2) --output $(out)",
}

// Standalone vbmeta image signing the test image persistent digest descriptor.
genrule {
    name: "avbrs_test_vbmeta_persistent_digest",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor_persistent_digest",
        ":avb_testkey_rsa4096",
    ],
    out: ["test_vbmeta_persistent_digest.img"],
    cmd: "$(location avbtool) make_vbmeta_image --key $(location :avb_testkey_rsa4096) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor_persistent_digest) --output $(out)",
}

// Standalone vbmeta image with property descriptor "test_prop_key" = "test_prop_value".
genrule {
    name: "avbrs_test_vbmeta_with_property",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor",
        ":avb_testkey_rsa4096",
    ],
    out: ["test_vbmeta_with_property.img"],
    cmd: "$(location avbtool) make_vbmeta_image --prop test_prop_key:test_prop_value --key $(location :avb_testkey_rsa4096) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor) --output $(out)",
}

// Standalone vbmeta image with the test image hashtree descriptor.
genrule {
    name: "avbrs_test_vbmeta_with_hashtree",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor_hashtree",
        ":avb_testkey_rsa4096",
    ],
    out: ["test_vbmeta_with_hashtree.img"],
    cmd: "$(location avbtool) make_vbmeta_image --key $(location :avb_testkey_rsa4096) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor_hashtree) --output $(out)",
}

// Standalone vbmeta image with kernel commandline "test_cmdline_key=test_cmdline_value".
genrule {
    name: "avbrs_test_vbmeta_with_commandline",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor",
        ":avb_testkey_rsa4096",
    ],
    out: ["test_vbmeta_with_commandline.img"],
    cmd: "$(location avbtool) make_vbmeta_image --kernel_cmdline test_cmdline_key=test_cmdline_value --key $(location :avb_testkey_rsa4096) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor) --output $(out)",
}

// Standalone vbmeta image with chain descriptor to "test_part_2" with rollback
// index 4, signed by avb_testkey_rsa8192.
genrule {
    name: "avbrs_test_vbmeta_with_chained_partition",
    tools: ["avbtool"],
    srcs: [
        ":avbrs_test_image_descriptor",
        ":avb_testkey_rsa4096",
        ":avb_testkey_rsa8192_pub_bin",
    ],
    out: ["test_vbmeta_with_chained_partition.img"],
    cmd: "$(location avbtool) make_vbmeta_image --chain_partition test_part_2:4:$(location :avb_testkey_rsa8192_pub_bin) --key $(location :avb_testkey_rsa4096) --algorithm SHA512_RSA4096 --include_descriptors_from_image $(location :avbrs_test_image_descriptor) --output $(out)",
}

// Combined test image + signed vbmeta footer for "test_part".
avb_add_hash_footer {
    name: "avbrs_test_image_with_vbmeta_footer",
    src: ":avbrs_test_image",
    partition_name: "test_part",
    private_key: ":avb_testkey_rsa4096",
    salt: "A000",
}

// Combined test image + signed vbmeta footer for "boot".
avb_add_hash_footer {
    name: "avbrs_test_image_with_vbmeta_footer_for_boot",
    src: ":avbrs_test_image",
    partition_name: "boot",
    private_key: ":avb_testkey_rsa4096",
    salt: "A001",
}

// Combined test image + signed vbmeta footer for "test_part_2" signed by
// avb_testkey_rsa8192 with rollback index = 7.
avb_add_hash_footer {
    name: "avbrs_test_image_with_vbmeta_footer_for_test_part_2",
    src: ":avbrs_test_image",
    partition_name: "test_part_2",
    private_key: ":avb_testkey_rsa8192",
    algorithm: "SHA256_RSA8192",
    salt: "A002",
    rollback_index: 7,
}