react-native-vision-camera/android/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!")
}

def nodeModules = findNodeModules(projectDir)
logger.warn("VisionCamera: node_modules/ found at: ${nodeModules}")
def reactNative = new File("$nodeModules/react-native")

def reactProperties = new Properties()
file("$nodeModules/react-native/ReactAndroid/gradle.properties").withInputStream { reactProperties.load(it) }
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
  }
})
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()
}

// 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}"
        }
      }
    }
  }

  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"]
    // 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 rnAAR = fileTree("${nodeModules}/react-native/android").matching({ it.include "**/**/*.aar" }).singleFile
    def jscAAR = fileTree("${nodeModules}/jsc-android/dist/org/webkit/android-jsc").matching({ it.include "**/**/*.aar" }).singleFile

    def inputFile = file("${nodeModules}/react-native/package.json")
    def json = new JsonSlurper().parseText(inputFile.text)
    def reactNativeVersion = json.version as String
    def (major, minor, patch) = reactNativeVersion.tokenize('.')

    def jsEngine = FOR_HERMES ? "hermes" : "jsc"
    def reaAAR = "${nodeModules}/react-native-reanimated/android/react-native-reanimated-${minor}-${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-alpha12"
  implementation "androidx.camera:camera-camera2:1.1.0-alpha12"
  implementation "androidx.camera:camera-lifecycle:1.1.0-alpha12"
  implementation "androidx.camera:camera-video:1.1.0-alpha12"

  implementation "androidx.camera:camera-view:1.0.0-alpha32"
  implementation "androidx.camera:camera-extensions:1.0.0-alpha32"

  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 downloadsDir = 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) {
    src("https://github.com/react-native-community/boost-for-react-native/releases/download/v${BOOST_VERSION.replace("_", ".")}-0/boost_${BOOST_VERSION}.tar.gz")
    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

  task prepareHermes() {
    doLast {
      def hermesPackagePath = file("${nodeModules}/hermes-engine")
      if (!hermesPackagePath.exists()) {
        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)
    }
  }
}