build.gradle

import groovy.json.JsonSlurper
import org.apache.tools.ant.filters.ReplaceTokens
import java.nio.file.Paths

static def findNodeModules(baseDir) {
  def basePath = baseDir.toPath().normalize()
  // Node's module resolution algorithm searches up to the root directory,
  // after which the base path will be null
  while (basePath) {
    def nodeModulesPath = Paths.get(basePath.toString(), "node_modules")
    def reactNativePath = Paths.get(nodeModulesPath.toString(), "react-native")
    if (nodeModulesPath.toFile().exists() && reactNativePath.toFile().exists()) {
      return nodeModulesPath.toString()
    }
    basePath = basePath.getParent()
  }
  throw new GradleException("VisionCamera: Failed to find node_modules/ path!")
}
static def findNodeModulePath(baseDir, packageName) {
    def basePath = baseDir.toPath().normalize()
    // Node's module resolution algorithm searches up to the root directory,
    // after which the base path will be null
    while (basePath) {
        def candidatePath = Paths.get(basePath.toString(), "node_modules", packageName)
        if (candidatePath.toFile().exists()) {
            return candidatePath.toString()
        }
        basePath = basePath.getParent()
    }
    return null
}

def isNewArchitectureEnabled() {
    // To opt-in for the New Architecture, you can either:
    // - Set `newArchEnabled` to true inside the `gradle.properties` file
    // - Invoke gradle with `-newArchEnabled=true`
    // - Set an environment variable `ORG_GRADLE_PROJECT_newArchEnabled=true`
    return project.hasProperty("newArchEnabled") && project.newArchEnabled == "true"
}

def nodeModules = findNodeModules(projectDir)
logger.warn("VisionCamera: node_modules/ found at: ${nodeModules}")
def reactNative = new File("$nodeModules/react-native")
def CMAKE_NODE_MODULES_DIR = project.getProjectDir().getParentFile().getParent()
def reactProperties = new Properties()
file("$nodeModules/react-native/ReactAndroid/gradle.properties").withInputStream { reactProperties.load(it) }
def REACT_NATIVE_FULL_VERSION = reactProperties.getProperty("VERSION_NAME")
def REACT_NATIVE_VERSION = reactProperties.getProperty("VERSION_NAME").split("\\.")[1].toInteger()

def FOR_HERMES = System.getenv("FOR_HERMES") == "True"
rootProject.getSubprojects().forEach({project ->
  if (project.plugins.hasPlugin("com.android.application")) {
    FOR_HERMES = project.ext.react.enableHermes
  }
})
def jsRuntimeDir = {
  if (FOR_HERMES) {
      if (REACT_NATIVE_VERSION >= 69) {
          return Paths.get(CMAKE_NODE_MODULES_DIR, "react-native", "sdks", "hermes")
      } else {
          return Paths.get(CMAKE_NODE_MODULES_DIR, "hermes-engine")
      }
  } else {
      return Paths.get(CMAKE_NODE_MODULES_DIR, "react-native", "ReactCommon", "jsi")
  }
}.call()
logger.warn("VisionCamera: Building with ${FOR_HERMES ? "Hermes" : "JSC"}...")

buildscript {
  // Buildscript is evaluated before everything else so we can't use getExtOrDefault
  def kotlin_version = rootProject.ext.has('kotlinVersion') ? rootProject.ext.get('kotlinVersion') : project.properties['VisionCamera_kotlinVersion']

  repositories {
    google()
    mavenCentral()
    maven {
      url "https://plugins.gradle.org/m2/"
    }
  }

  dependencies {
    classpath 'com.android.tools.build:gradle:4.2.2'
    classpath 'de.undercouch:gradle-download-task:4.1.2'
    // noinspection DifferentKotlinGradleVersion
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
  }
}

apply plugin: 'com.android.library'
apply plugin: 'de.undercouch.download'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

def getExtOrDefault(name) {
  return rootProject.ext.has(name) ? rootProject.ext.get(name) : project.properties['VisionCamera_' + name]
}

def getExtOrIntegerDefault(name) {
  return rootProject.ext.has(name) ? rootProject.ext.get(name) : (project.properties['VisionCamera_' + name]).toInteger()
}

def resolveBuildType() {
    def buildType = "debug"
    tasks.all({ task ->
        if (task.name == "buildCMakeRelease") {
            buildType = "release"
        }
    })
    return buildType
}

// plugin.js file only exists since REA v2.
def hasReanimated2 = file("${nodeModules}/react-native-reanimated/plugin.js").exists()
def disableFrameProcessors = rootProject.ext.has("disableFrameProcessors") ? rootProject.ext.get("disableFrameProcessors").asBoolean() : false
def ENABLE_FRAME_PROCESSORS = hasReanimated2 && !disableFrameProcessors

if (ENABLE_FRAME_PROCESSORS) {
  logger.warn("VisionCamera: Frame Processors are enabled! Building C++ part...")
} else {
  if (disableFrameProcessors) {
    logger.warn("VisionCamera: Frame Processors are disabled because the user explicitly disabled it ('disableFrameProcessors=${disableFrameProcessors}'). C++ part will not be built.")
  } else if (!hasReanimated2) {
    logger.warn("VisionCamera: Frame Processors are disabled because REA v2 does not exist. C++ part will not be built.")
  }
}

android {
  compileSdkVersion getExtOrIntegerDefault('compileSdkVersion')
  buildToolsVersion getExtOrDefault('buildToolsVersion')
  ndkVersion getExtOrDefault('ndkVersion')

  defaultConfig {
    minSdkVersion 21
    targetSdkVersion getExtOrIntegerDefault('targetSdkVersion')

    if (ENABLE_FRAME_PROCESSORS) {
      externalNativeBuild {
        cmake {
          cppFlags "-fexceptions", "-frtti", "-std=c++1y", "-DONANDROID"
          abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
          arguments '-DANDROID_STL=c++_shared',
                  "-DREACT_NATIVE_VERSION=${REACT_NATIVE_VERSION}",
                  "-DNODE_MODULES_DIR=${nodeModules}",
                  "-DFOR_HERMES=${FOR_HERMES}",
                  "-DJS_RUNTIME_DIR=${jsRuntimeDir}"
        }
      }
    }
  }

  dexOptions {
    javaMaxHeapSize "4g"
  }

  if (ENABLE_FRAME_PROCESSORS) {
    externalNativeBuild {
      cmake {
        path "CMakeLists.txt"
      }
    }
  }

  packagingOptions {
    // Exclude all Libraries that are already present in the user's app (through React Native or by him installing REA)
    excludes = ["**/libc++_shared.so", "**/libfbjni.so", "**/libjsi.so", "**/libreactnativejni.so", "**/libfolly_json.so", "**/libreanimated.so", "**/libjscexecutor.so", "**/libhermes.so", "**/libfolly_runtime.so"]
    // META-INF is duplicate by CameraX.
    exclude "META-INF/**"
  }

  buildTypes {
    release {
      minifyEnabled false
    }
  }

  lintOptions {
    disable 'GradleCompatible'
  }
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }

  configurations {
    extractHeaders
    extractJNI
  }
}

repositories {
  mavenCentral()
  google()

  def found = false
  def defaultDir = null
  def androidSourcesName = 'React Native sources'

  if (rootProject.ext.has('reactNativeAndroidRoot')) {
    defaultDir = rootProject.ext.get('reactNativeAndroidRoot')
  } else {
    defaultDir = new File(
            projectDir,
            '/../../../node_modules/react-native/android'
    )
  }

  if (defaultDir.exists()) {
    maven {
      url defaultDir.toString()
      name androidSourcesName
    }

    logger.info(":${project.name}:reactNativeAndroidRoot ${defaultDir.canonicalPath}")
    found = true
  } else {
    def parentDir = rootProject.projectDir

    1.upto(5, {
      if (found) return true
      parentDir = parentDir.parentFile

      def androidSourcesDir = new File(
              parentDir,
              'node_modules/react-native'
      )

      def androidPrebuiltBinaryDir = new File(
              parentDir,
              'node_modules/react-native/android'
      )

      if (androidPrebuiltBinaryDir.exists()) {
        maven {
          url androidPrebuiltBinaryDir.toString()
          name androidSourcesName
        }

        logger.info(":${project.name}:reactNativeAndroidRoot ${androidPrebuiltBinaryDir.canonicalPath}")
        found = true
      } else if (androidSourcesDir.exists()) {
        maven {
          url androidSourcesDir.toString()
          name androidSourcesName
        }

        logger.info(":${project.name}:reactNativeAndroidRoot ${androidSourcesDir.canonicalPath}")
        found = true
      }
    })
  }

  if (!found) {
    throw new GradleException(
            "${project.name}: unable to locate React Native android sources. " +
                    "Ensure you have you installed React Native as a dependency in your project and try again."
    )
  }
}

def kotlin_version = getExtOrDefault('kotlinVersion')

dependencies {
  // noinspection GradleDynamicVersion
  implementation 'com.facebook.react:react-native:+'

  if (ENABLE_FRAME_PROCESSORS) {
    implementation project(':react-native-reanimated')

    //noinspection GradleDynamicVersion
    extractHeaders("com.facebook.fbjni:fbjni:+:headers")
    //noinspection GradleDynamicVersion
    extractJNI("com.facebook.fbjni:fbjni:+")

    def rnAarMatcher = "**/react-native/**/*${resolveBuildType()}.aar"
    if (REACT_NATIVE_VERSION < 69) {
      rnAarMatcher = "**/**/*.aar"
    }
    def rnAAR = fileTree("$reactNative/android").matching({ it.include rnAarMatcher }).singleFile
    def jscAAR = fileTree("${nodeModules}/jsc-android/dist/org/webkit/android-jsc").matching({ it.include "**/**/*.aar" }).singleFile
    def jsEngine = FOR_HERMES ? "hermes" : "jsc"
    def reaAAR = "${nodeModules}/react-native-reanimated/android/react-native-reanimated-${REACT_NATIVE_VERSION}-${jsEngine}.aar"
    extractJNI(files(rnAAR, jscAAR, reaAAR))
  }

  implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-guava:1.5.2"
  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2"

  implementation "androidx.camera:camera-core:1.1.0-beta02"
  implementation "androidx.camera:camera-camera2:1.1.0-beta02"
  implementation "androidx.camera:camera-lifecycle:1.1.0-beta02"
  implementation "androidx.camera:camera-video:1.1.0-beta02"

  implementation "androidx.camera:camera-view:1.1.0-beta02"
  implementation "androidx.camera:camera-extensions:1.1.0-beta02"

  implementation "androidx.exifinterface:exifinterface:1.3.3"
}


if (ENABLE_FRAME_PROCESSORS) {
  // third-party-ndk deps headers
  // mostly a copy of https://github.com/software-mansion/react-native-reanimated/blob/master/android/build.gradle#L115
  def customDownloadsDir = System.getenv("REACT_NATIVE_DOWNLOADS_DIR")
  def downloadsDir = customDownloadsDir ? new File(customDownloadsDir) : new File("$buildDir/downloads")
  def thirdPartyNdkDir = new File("$buildDir/third-party-ndk")
  def thirdPartyVersionsFile = new File("${nodeModules}/react-native/ReactAndroid/gradle.properties")
  def thirdPartyVersions = new Properties()
  thirdPartyVersions.load(new FileInputStream(thirdPartyVersionsFile))

  def BOOST_VERSION = thirdPartyVersions["BOOST_VERSION"]
  def boost_file = new File(downloadsDir, "boost_${BOOST_VERSION}.tar.gz")
  def DOUBLE_CONVERSION_VERSION = thirdPartyVersions["DOUBLE_CONVERSION_VERSION"]
  def double_conversion_file = new File(downloadsDir, "double-conversion-${DOUBLE_CONVERSION_VERSION}.tar.gz")
  def FOLLY_VERSION = thirdPartyVersions["FOLLY_VERSION"]
  def folly_file = new File(downloadsDir, "folly-${FOLLY_VERSION}.tar.gz")
  def GLOG_VERSION = thirdPartyVersions["GLOG_VERSION"]
  def glog_file = new File(downloadsDir, "glog-${GLOG_VERSION}.tar.gz")

  task createNativeDepsDirectories {
    doLast {
      downloadsDir.mkdirs()
      thirdPartyNdkDir.mkdirs()
    }
  }

  task downloadBoost(dependsOn: createNativeDepsDirectories, type: Download) {
    def transformedVersion = BOOST_VERSION.replace("_", ".")
    def srcUrl = "https://boostorg.jfrog.io/artifactory/main/release/${transformedVersion}/source/boost_${BOOST_VERSION}.tar.gz"
    if (REACT_NATIVE_VERSION < 69) {
      srcUrl = "https://github.com/react-native-community/boost-for-react-native/releases/download/v${transformedVersion}-0/boost_${BOOST_VERSION}.tar.gz"
    }
    src(srcUrl)
    onlyIfNewer(true)
    overwrite(false)
    dest(boost_file)
  }

  task prepareBoost(dependsOn: downloadBoost, type: Copy) {
    from(tarTree(resources.gzip(downloadBoost.dest)))
    from("src/main/jni/third-party/boost/Android.mk")
    include("Android.mk", "boost_${BOOST_VERSION}/boost/**/*.hpp", "boost/boost/**/*.hpp")
    includeEmptyDirs = false
    into("$thirdPartyNdkDir") // /boost_X_XX_X
    doLast {
      file("$thirdPartyNdkDir/boost_${BOOST_VERSION}").renameTo("$thirdPartyNdkDir/boost")
    }
  }

  task downloadDoubleConversion(dependsOn: createNativeDepsDirectories, type: Download) {
    src("https://github.com/google/double-conversion/archive/v${DOUBLE_CONVERSION_VERSION}.tar.gz")
    onlyIfNewer(true)
    overwrite(false)
    dest(double_conversion_file)
  }

  task prepareDoubleConversion(dependsOn: downloadDoubleConversion, type: Copy) {
    from(tarTree(downloadDoubleConversion.dest))
    from("src/main/jni/third-party/double-conversion/Android.mk")
    include("double-conversion-${DOUBLE_CONVERSION_VERSION}/src/**/*", "Android.mk")
    filesMatching("*/src/**/*", { fname -> fname.path = "double-conversion/${fname.name}" })
    includeEmptyDirs = false
    into("$thirdPartyNdkDir/double-conversion")
  }

  task downloadFolly(dependsOn: createNativeDepsDirectories, type: Download) {
    src("https://github.com/facebook/folly/archive/v${FOLLY_VERSION}.tar.gz")
    onlyIfNewer(true)
    overwrite(false)
    dest(folly_file)
  }

  task prepareFolly(dependsOn: downloadFolly, type: Copy) {
    from(tarTree(downloadFolly.dest))
    from("src/main/jni/third-party/folly/Android.mk")
    include("folly-${FOLLY_VERSION}/folly/**/*", "Android.mk")
    eachFile { fname -> fname.path = (fname.path - "folly-${FOLLY_VERSION}/") }
    includeEmptyDirs = false
    into("$thirdPartyNdkDir/folly")
  }

  task downloadGlog(dependsOn: createNativeDepsDirectories, type: Download) {
    src("https://github.com/google/glog/archive/v${GLOG_VERSION}.tar.gz")
    onlyIfNewer(true)
    overwrite(false)
    dest(glog_file)
  }

  task prepareGlog(dependsOn: downloadGlog, type: Copy) {
    from(tarTree(downloadGlog.dest))
    from("src/main/jni/third-party/glog/")
    include("glog-${GLOG_VERSION}/src/**/*", "Android.mk", "config.h")
    includeEmptyDirs = false
    filesMatching("**/*.h.in") {
      filter(ReplaceTokens, tokens: [
              ac_cv_have_unistd_h           : "1",
              ac_cv_have_stdint_h           : "1",
              ac_cv_have_systypes_h         : "1",
              ac_cv_have_inttypes_h         : "1",
              ac_cv_have_libgflags          : "0",
              ac_google_start_namespace     : "namespace google {",
              ac_cv_have_uint16_t           : "1",
              ac_cv_have_u_int16_t          : "1",
              ac_cv_have___uint16           : "0",
              ac_google_end_namespace       : "}",
              ac_cv_have___builtin_expect   : "1",
              ac_google_namespace           : "google",
              ac_cv___attribute___noinline  : "__attribute__ ((noinline))",
              ac_cv___attribute___noreturn  : "__attribute__ ((noreturn))",
              ac_cv___attribute___printf_4_5: "__attribute__((__format__ (__printf__, 4, 5)))"
      ])
      it.path = (it.name - ".in")
    }
    into("$thirdPartyNdkDir/glog")

    doLast {
      copy {
        from(fileTree(dir: "$thirdPartyNdkDir/glog", includes: ["stl_logging.h", "logging.h", "raw_logging.h", "vlog_is_on.h", "**/src/glog/log_severity.h"]).files)
        includeEmptyDirs = false
        into("$thirdPartyNdkDir/glog/exported/glog")
      }
    }
  }

  task prepareThirdPartyNdkHeaders {
    if (!boost_file.exists()) {
      dependsOn(prepareBoost)
    }
    if (!double_conversion_file.exists()) {
      dependsOn(prepareDoubleConversion)
    }
    if (!folly_file.exists()) {
      dependsOn(prepareFolly)
    }
    if (!glog_file.exists()) {
      dependsOn(prepareGlog)
    }
  }

  prepareThirdPartyNdkHeaders.mustRunAfter createNativeDepsDirectories

  /*
  COPY-PASTE from react-native-reanimated.
  Vision Camera includes "hermes/hermes.h" header file in `NativeProxy.cpp`.
  Previously, we used header files from `hermes-engine` package in `node_modules`.
  Starting from React Native 0.69, Hermes is no longer distributed as package on NPM.
  On the new architecture, Hermes is downloaded from GitHub and then compiled from sources.
  However, on the old architecture, we need to download Hermes header files on our own
  as well as unzip Hermes AAR in order to obtain `libhermes.so` shared library.
  For more details, see https://reactnative.dev/architecture/bundled-hermes
  or https://github.com/reactwg/react-native-new-architecture/discussions/4
  */
  if (REACT_NATIVE_VERSION >= 69 && !isNewArchitectureEnabled()) {
      // copied from `react-native/ReactAndroid/hermes-engine/build.gradle`

      def customDownloadDir = System.getenv("REACT_NATIVE_DOWNLOADS_DIR")
      def downloadDir = customDownloadDir ? new File(customDownloadDir) : new File(reactNative, "sdks/download")

      // By default we are going to download and unzip hermes inside the /sdks/hermes folder
      // but you can provide an override for where the hermes source code is located.
      def hermesDir = System.getenv("REACT_NATIVE_OVERRIDE_HERMES_DIR") ?: new File(reactNative, "sdks/hermes")

      def hermesVersion = "main"
      def hermesVersionFile = new File(reactNative, "sdks/.hermesversion")
      if (hermesVersionFile.exists()) {
          hermesVersion = hermesVersionFile.text
      }

      task downloadHermes(type: Download) {
          src("https://github.com/facebook/hermes/tarball/${hermesVersion}")
          onlyIfNewer(true)
          overwrite(false)
          dest(new File(downloadDir, "hermes.tar.gz"))
      }

      task unzipHermes(dependsOn: downloadHermes, type: Copy) {
          from(tarTree(downloadHermes.dest)) {
              eachFile { file ->
                  // We flatten the unzip as the tarball contains a `facebook-hermes-<SHA>`
                  // folder at the top level.
                  if (file.relativePath.segments.size() > 1) {
                      file.relativePath = new org.gradle.api.file.RelativePath(!file.isDirectory(), file.relativePath.segments.drop(1))
                  }
              }
          }
          into(hermesDir)
      }
  }

  task prepareHermes() {
      if (REACT_NATIVE_VERSION >= 69) {
          if (!isNewArchitectureEnabled()) {
              dependsOn(unzipHermes)
          }

          doLast {
              def hermesAAR = file("$reactNative/android/com/facebook/react/hermes-engine/$REACT_NATIVE_FULL_VERSION/hermes-engine-$REACT_NATIVE_FULL_VERSION-${resolveBuildType()}.aar") // e.g. hermes-engine-0.70.0-rc.1-debug.aar
              if (!hermesAAR.exists()) {
                  throw new GradleScriptException("Could not find hermes-engine AAR", null)
              }

              def soFiles = zipTree(hermesAAR).matching({ it.include "**/*.so" })

              copy {
                  from soFiles
                  from "$reactNative/ReactAndroid/src/main/jni/first-party/hermes/Android.mk"
                  into "$thirdPartyNdkDir/hermes"
              }
          }
      } else {
          doLast {
              def hermesPackagePath = findNodeModulePath(projectDir, "hermes-engine")
              if (!hermesPackagePath) {
                  throw new GradleScriptException("Could not find the hermes-engine npm package", null)
              }

              def hermesAAR = file("$hermesPackagePath/android/hermes-debug.aar")
              if (!hermesAAR.exists()) {
                  throw new GradleScriptException("The hermes-engine npm package is missing \"android/hermes-debug.aar\"", null)
              }

              def soFiles = zipTree(hermesAAR).matching({ it.include "**/*.so" })

              copy {
                  from soFiles
                  from "$reactNative/ReactAndroid/src/main/jni/first-party/hermes/Android.mk"
                  into "$thirdPartyNdkDir/hermes"
              }
          }
      }
  }

  prepareHermes.mustRunAfter prepareThirdPartyNdkHeaders

  task prepareJSC {
    doLast {
      def jscPackagePath = file("${nodeModules}/jsc-android")
      if (!jscPackagePath.exists()) {
        throw new GradleScriptException("Could not find the jsc-android npm package", null)
      }

      def jscDist = file("$jscPackagePath/dist")
      if (!jscDist.exists()) {
        throw new GradleScriptException("The jsc-android npm package is missing its \"dist\" directory", null)
      }

      def jscAAR = fileTree(jscDist).matching({ it.include "**/android-jsc/**/*.aar" }).singleFile
      def soFiles = zipTree(jscAAR).matching({ it.include "**/*.so" })

      def headerFiles = fileTree(jscDist).matching({ it.include "**/include/*.h" })

      copy {
        from(soFiles)
        from(headerFiles)
        from("$reactNative/ReactAndroid/src/main/jni/third-party/jsc/Android.mk")

        filesMatching("**/*.h", { it.path = "JavaScriptCore/${it.name}" })

        includeEmptyDirs(false)
        into("$thirdPartyNdkDir/jsc")
      }
    }
  }

  prepareJSC.mustRunAfter prepareHermes

  task extractAARHeaders {
    doLast {
      configurations.extractHeaders.files.each {
        def file = it.absoluteFile
        copy {
          from zipTree(file)
          into "$buildDir/$file.name"
          include "**/*.h"
        }
      }
    }
  }

  extractAARHeaders.mustRunAfter prepareJSC

  task extractJNIFiles {
    doLast {
      configurations.extractJNI.files.each {
        def file = it.absoluteFile

        copy {
          from zipTree(file)
          into "$buildDir/$file.name"
          include "jni/**/*"
        }
      }
    }
  }

  extractJNIFiles.mustRunAfter extractAARHeaders

  // pre-native build pipeline

  tasks.whenTaskAdded { task ->
    if (!task.name.contains('Clean') && (task.name.contains('externalNative') || task.name.contains('CMake'))) {
      task.dependsOn(extractAARHeaders)
      task.dependsOn(extractJNIFiles)
      task.dependsOn(prepareJSC)
      task.dependsOn(prepareHermes)
      task.dependsOn(prepareThirdPartyNdkHeaders)
    }
  }
}