add GetQRCodeUseCase and qrcode repository [#76]

- QR코드 생성 및 Bitmap 반환 UseCase 추가

domain/src/main/java/com/foke/together/domain/interactor/GetQRCodeUseCase.kt

@@ -0,0 +1,17 @@
+package com.foke.together.domain.interactor
+
+import android.graphics.Bitmap
+import com.foke.together.domain.output.QRCodeRepositoryInterface
+import javax.inject.Inject
+
+class GetQRCodeUseCase @Inject constructor(
+    private val qrCodeRepository: QRCodeRepositoryInterface
+){
+    suspend operator fun invoke(key: String, url: String): Result<Bitmap> {
+        qrCodeRepository.generateQRCode(key, url)
+            .onSuccess {
+                return qrCodeRepository.readQRCode(key)
+            }
+        return Result.failure(Exception("cannot generate qr code"))
+    }
+}

domain/src/main/java/com/foke/together/domain/output/QRCodeRepositoryInterface.kt

@@ -0,0 +1,8 @@
+package com.foke.together.domain.output
+
+import android.graphics.Bitmap
+
+interface QRCodeRepositoryInterface {
+    suspend fun generateQRCode(key: String, url: String): Result<Unit>
+    suspend fun readQRCode(key: String): Result<Bitmap>
+}

external/src/main/java/com/foke/together/external/qrcode/QRCodeGenerator.kt

@@ -0,0 +1,42 @@
+package com.foke.together.external.qrcode
+
+import android.content.Context
+import android.graphics.Bitmap
+import com.foke.together.util.AppPolicy
+import com.foke.together.util.FileUtil
+import com.foke.together.util.ImageFileUtil
+import qrcode.QRCode
+import javax.inject.Inject
+
+class QRCodeGenerator @Inject constructor(
+) {
+    suspend fun generate(context: Context, key: String, data: String): Result<Unit> =
+        runCatching {
+            val squares = QRCode.ofSquares()
+            // TODO: check customize qrcode
+//        val circles = QRCode.ofCircles()
+//        val roundedSquares = QRCode.ofRoundedSquares()
+
+            val qrcode = squares
+                .withInnerSpacing(0)
+                // TODO: check customize qrcode
+//            .withColor(Colors.BLACK)
+//            .withRadius(20)
+//            .withSize(25)
+//            .withLogo(logo.readBytes(), 20, 20)
+                .build(data)
+
+            val qrImage = qrcode.render().nativeImage() as Bitmap
+
+            // TODO: need to merge ImageFileUtil and FileUtil
+            FileUtil.createDir(context, key)
+            ImageFileUtil.cacheBitmap(context, qrImage, "$key/${AppPolicy.DEFAULT_QR_CODE_IMAGE_NAME}")
+        }
+
+    fun readFile(context: Context, key: String): Result<Bitmap> {
+        FileUtil.readCachedQRCodeImage(context, key)?.run {
+            return Result.success(this)
+        }
+        return Result.failure(Exception("cannot read file"))
+    }
+}

external/src/main/java/com/foke/together/external/repository/QRCodeRepository.kt

@@ -0,0 +1,23 @@
+package com.foke.together.external.repository
+
+import android.content.Context
+import com.foke.together.domain.output.QRCodeRepositoryInterface
+import com.foke.together.external.qrcode.QRCodeGenerator
+import dagger.hilt.android.qualifiers.ApplicationContext
+import javax.inject.Inject
+
+class QRCodeRepository @Inject constructor(
+    @ApplicationContext private val context: Context,
+    private val qrCodeGenerator: QRCodeGenerator
+): QRCodeRepositoryInterface {
+    override suspend fun generateQRCode(key: String, url: String): Result<Unit> {
+        return qrCodeGenerator.generate(context, key, url)
+    }
+
+    override suspend fun readQRCode(key: String) =
+        qrCodeGenerator.readFile(context, key)
+
+    companion object {
+        private val TAG = QRCodeRepository::class.java.simpleName
+    }
+}

external/src/main/java/com/foke/together/external/repository/di/RepositoryModule.kt

@@ -2,8 +2,10 @@ package com.foke.together.external.repository.di
 
 import com.foke.together.domain.output.ExternalCameraRepositoryInterface
 import com.foke.together.domain.output.ImageRepositoryInterface
+import com.foke.together.domain.output.QRCodeRepositoryInterface
 import com.foke.together.external.repository.ExternalCameraRepository
 import com.foke.together.external.repository.ImageRepository
+import com.foke.together.external.repository.QRCodeRepository
 import dagger.Binds
 import dagger.Module
 import dagger.hilt.InstallIn
@@ -19,8 +21,15 @@ abstract class RepositoryModule {
         externalCameraRepository: ExternalCameraRepository
     ): ExternalCameraRepositoryInterface
 
+    @Singleton
     @Binds
     abstract fun bindImageRepository(
         imageRepository: ImageRepository
     ): ImageRepositoryInterface
+
+    @Singleton
+    @Binds
+    abstract fun bindQRCodeRepository(
+        qrCodeRepository: QRCodeRepository
+    ): QRCodeRepositoryInterface
 }

util/src/main/java/com/foke/together/util/AppPolicy.kt

@@ -24,4 +24,6 @@ object AppPolicy {
     const val CAPTURED_FOUR_CUT_IMAGE_NAME = "capture"
     const val SINGLE_ROW_FINAL_IMAGE_NAME = "final_single_row"
     const val TWO_ROW_FINAL_IMAGE_NAME = "final_two_row"
+
+    const val DEFAULT_QR_CODE_IMAGE_NAME = "qrcode"
 }

util/src/main/java/com/foke/together/util/FileUtil.kt

@@ -0,0 +1,25 @@
+package com.foke.together.util
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import java.io.File
+
+object FileUtil {
+    fun readCachedQRCodeImage(context: Context, key: String): Bitmap? {
+        val qrImageFile = File("${context.cacheDir}/$key/${AppPolicy.DEFAULT_QR_CODE_IMAGE_NAME}.jpg")
+        var qrImage: Bitmap? = null
+
+        if (qrImageFile.exists()) {
+            qrImage = BitmapFactory.decodeFile(qrImageFile.absolutePath)
+        }
+        return qrImage
+    }
+
+    fun createDir(context: Context, key: String) {
+        val dir = File("${context.cacheDir}/$key")
+        if(!dir.exists()) {
+            dir.mkdirs()
+        }
+    }
+}