First commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "com.example.safintegrity"
+        minSdk 21
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'com.google.android.material:material:1.5.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.safintegrity">
+
+    <application
+        android:allowBackup="true"
+        android:label="SAFIntegrity"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.MaterialComponents.DayNight.DarkActionBar">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/example/safintegrity/MainActivity.kt

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+package com.example.safintegrity
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.widget.Button
+import android.widget.TextView
+import androidx.activity.result.ActivityResultCallback
+import androidx.activity.result.contract.ActivityResultContracts
+import java.io.InputStream
+import java.security.MessageDigest
+
+class MainActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        findViewById<Button>(R.id.button_create_document)?.setOnClickListener {
+            activityResultLauncherCreation.launch("ImageTest.jpg")
+        }
+
+        findViewById<Button>(R.id.button_open_document)?.setOnClickListener {
+            activityResultLauncherOpening.launch("*/*")
+        }
+    }
+
+    /*
+     * HASH
+     */
+
+    private fun md5(inputStream: InputStream): String {
+        val digest = MessageDigest.getInstance("MD5")
+        inputStream.buffered(1024).use { it.iterator().forEach(digest::update) }
+        return digest.digest().joinToString("") { "%02x".format(it) }
+    }
+
+    private fun InputStream.readAllBytes(bufferSize: Int = DEFAULT_BUFFER_SIZE,
+                                         readBytes: (bytesRead: ByteArray) -> Unit) {
+        val buffer = ByteArray(bufferSize)
+        var read = 0
+        while (read != -1) {
+            read = this.read(buffer, 0, buffer.size)
+            if (read != -1) {
+                val optimizedBuffer: ByteArray = if (buffer.size == read) {
+                    buffer
+                } else {
+                    buffer.copyOf(read)
+                }
+                readBytes.invoke(optimizedBuffer)
+            }
+        }
+    }
+
+    /*
+     * CREATION
+     */
+
+    private val resultCreationCallback = ActivityResultCallback<Uri> { resultUri ->
+        val outputStream = contentResolver.openOutputStream(resultUri, "rwt")
+        outputStream?.use {
+            val assetString = "test.jpg"
+            assets.open(assetString).use { inputStream ->
+                inputStream.readAllBytes { buffer ->
+                    outputStream.write(buffer)
+                }
+            }
+            findViewById<TextView>(R.id.create_document_hash).text =
+                md5(assets.open(assetString))
+        }
+    }
+
+    private val activityResultLauncherCreation = this.registerForActivityResult(
+            CreateDocument(),
+            resultCreationCallback
+        )
+
+    private class CreateDocument : ActivityResultContracts.CreateDocument() {
+        override fun createIntent(context: Context, input: String): Intent {
+            return super.createIntent(context, input).apply {
+                addCategory(Intent.CATEGORY_OPENABLE)
+                type = "application/octet-stream"
+            }
+        }
+    }
+
+    /*
+     * OPENING
+     */
+
+    private val resultOpeningCallback = ActivityResultCallback<Uri> { resultUri ->
+        contentResolver.openInputStream(resultUri)?.let { inputStream ->
+            findViewById<TextView>(R.id.open_document_hash).text = md5(inputStream)
+        }
+    }
+
+    private val activityResultLauncherOpening = this.registerForActivityResult(
+        GetContent(),
+        resultOpeningCallback
+    )
+
+    class GetContent : ActivityResultContracts.GetContent() {
+        override fun createIntent(context: Context, input: String): Intent {
+            return super.createIntent(context, input).apply {
+                addCategory(Intent.CATEGORY_OPENABLE)
+                addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
+                addFlags(Intent.FLAG_GRANT_PREFIX_URI_PERMISSION)
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+            }
+        }
+    }
+}

app/src/main/res/layout/activity_main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <Button
+        android:id="@+id/button_create_document"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="ACTION_CREATE_DOCUMENT"
+        app:layout_constraintBottom_toTopOf="@+id/button_open_document"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+    <TextView
+        android:id="@+id/create_document_hash"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hash"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/button_create_document" />
+    <Button
+        android:layout_marginTop="96dp"
+        android:id="@+id/button_open_document"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="ACTION_OPEN_DOCUMENT"
+        app:layout_constraintBottom_toTopOf="@+id/open_document_hash"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/button_create_document" />
+    <TextView
+        android:id="@+id/open_document_hash"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hash"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/button_open_document" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    id 'com.android.application' version '7.1.1' apply false
+    id 'com.android.library' version '7.1.1' apply false
+    id 'org.jetbrains.kotlin.android' version '1.6.10' apply false
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle.properties

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+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true

gradle/wrapper/gradle-wrapper.properties

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+#Thu Feb 10 12:46:03 CET 2022
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME