libsignal/java/android/build.gradle

import groovy.json.JsonSlurper

plugins {
    id 'com.android.library' version '8.4.1'
    id 'maven-publish'
    id 'signing'
}

archivesBaseName = "libsignal-android"

repositories {
    google()
    mavenCentral()
    mavenLocal()
}

android {
    namespace 'org.signal.libsignal'

    compileSdk 34
    ndkVersion '27.0.12077973'

    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 33
        multiDexEnabled true
        testInstrumentationRunner "org.signal.libsignal.util.AndroidJUnitRunner"
        // Automatically propagate matching environment variables into Java properties.
        // See the custom AndroidJUnitRunner and TestEnvironment classes for more details.
        testInstrumentationRunnerArguments["org.signal.libsignal.test.environment"] = collectTestEnvironment()
    }

    compileOptions {
        coreLibraryDesugaringEnabled true
        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17
    }

    sourceSets {
        androidTest {
            java {
                // Also run all the Android-agnostic tests by default.
                srcDir '../client/src/test/java'
                srcDir '../shared/test/java'
            }
            resources {
                srcDir '../client/src/test/resources'
            }
        }
    }

    packagingOptions {
        // Defer stripping to the Android app project.
        doNotStrip '**/*.so'
    }

    publishing {
        singleVariant('release')
    }
}

String collectTestEnvironment() {
    def result = []
    System.getenv().each { k, v ->
        if (k.startsWith("LIBSIGNAL_TESTING_")) {
            // Limit what characters we accept in values.
            // This is going to get mashed down to a single command-line argument.
            // (This pattern is only meant to head off likely problems and was not specifically
            // tested; if you need to use one of these characters, you can remove the check and see
            // if things Just Work, or tweak our AndroidJUnitRunner to handle different delimiters
            // or escaping.)
            if (v.matches(".*[, \t\r\n].*")) {
                logger.warn("warning: ignoring ${k} for running tests; it contains invalid characters")
                return
            }
            result << "${k}=${v}"
        }
    }
    result.join(",")
}

// From https://github.com/rustls/rustls-platform-verifier
File findRustlsPlatformVerifierClasses() {
    def dependencyText = providers.exec {
        it.workingDir = project.rootDir.parentFile
        commandLine("bash", "java/find_cargo.sh", "metadata", "--format-version", "1")
    }.standardOutput.asText.get()

    def dependencyJson = new JsonSlurper().parseText(dependencyText)
    def manifestPath = file(dependencyJson.packages.find { it.name == "rustls-platform-verifier-android" }.manifest_path)

    // Modifications here:
    // Rather than use the Maven repository in the crates.io source, reference the AAR directly by path.
    // Then, extract the classes from it so that we have a self-contained library.
    def aar = fileTree(manifestPath.parentFile).matching {
        include "maven/rustls/rustls-platform-verifier/*/rustls-platform-verifier-*.aar"
    }.getSingleFile()
    def classesJar = zipTree(aar).matching {
        // Make sure there's nothing in the AAR that we haven't accounted for.
        // This isn't perfect: there could be something important in AndroidManifest.xml.
        // But it's likely good enough.
        exclude "AndroidManifest.xml"
        exclude "META-INF/com/android/build/gradle/aar-metadata.properties"
        exclude "R.txt"
    }.getSingleFile()
    assert classesJar.name == "classes.jar"
    return classesJar
}

dependencies {
    implementation files(findRustlsPlatformVerifierClasses())

    androidTestImplementation "androidx.test:runner:1.4.0"
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.6'
    api project(':client')
}

preBuild {
    dependsOn 'collectAssets'
    dependsOn 'makeJniLibraries'
}

String[] archsFromProperty(String prop) {
    findProperty(prop)?.split(',')?.findAll { it != '' }?.collect { 'android-' + it }
}

task makeJniLibraries(type:Exec) {
    group 'Rust'
    description 'Build the JNI libraries for Android'

    def archs = archsFromProperty('androidArchs') ?: ['android']
    def debugLevelLogsFlag = project.hasProperty('debugLevelLogs') ? ['--debug-level-logs'] : []
    def debugFlag = project.hasProperty('debugRust') ? ['--debug'] : []
    // Explicitly specify 'bash' for Windows compatibility.
    commandLine 'bash', '../build_jni.sh', *debugLevelLogsFlag, *debugFlag, *archs
    environment 'ANDROID_NDK_HOME', android.ndkDirectory
}

task collectAssets(type:Copy) {
    from('../../acknowledgments/acknowledgments.md') {
        rename 'acknowledgments.md', 'libsignal.md'
    }
    into 'src/main/assets/acknowledgments'
}

// MARK: Publication
afterEvaluate {
    publishing {
        publications {
            mavenJava(MavenPublication) {
                artifactId = archivesBaseName
                from components.release

                pom {
                    name = archivesBaseName
                    packaging = 'aar'
                    description = 'Signal Protocol cryptography library for Android'
                    url = 'https://github.com/signalapp/libsignal'

                    scm {
                        url = 'scm:git@github.com:signalapp/libsignal.git'
                        connection = 'scm:git@github.com:signalapp/libsignal.git'
                        developerConnection = 'scm:git@github.com:signalapp/libsignal.git'
                    }

                    licenses {
                        license {
                            name = 'AGPLv3'
                            url = 'https://www.gnu.org/licenses/agpl-3.0.txt'
                        }
                    }

                    developers {
                        developer {
                            name = 'Signal Messenger LLC'
                        }
                    }
                }
            }
        }
    }

    setUpSigningKey(signing)
    signing {
        required { isReleaseBuild() && gradle.taskGraph.hasTask(":android:publish") }
        sign publishing.publications.mavenJava
    }
}