add util

- add PreferenceReader interface
- add PreferenceWriter interface
- add lazy singleton ServicesFactory
- add retrofit dependencies into app module

app/build.gradle

@@ -24,6 +24,10 @@ android {
 }
 
 dependencies {
+    // retrofit
+    implementation "com.squareup.retrofit2:retrofit:2.6.2"
+    implementation "com.squareup.retrofit2:converter-gson:2.6.2"
+
     implementation project(':wrapper')
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation 'androidx.appcompat:appcompat:1.1.0'

app/src/main/java/it/unisannio/ding/ids/wedroid/app/util/PreferenceReader.java

@@ -0,0 +1,7 @@
+package it.unisannio.ding.ids.wedroid.app.util;
+
+public interface PreferenceReader {
+    String getBaseUrl();
+    String getUserId();
+    String getToken();
+}

app/src/main/java/it/unisannio/ding/ids/wedroid/app/util/PreferenceWriter.java

@@ -0,0 +1,7 @@
+package it.unisannio.ding.ids.wedroid.app.util;
+
+public interface PreferenceWriter {
+    void setBaseUrl(String baseUrl);
+    void setUserId(String userId);
+    void setToken(String token);
+}

app/src/main/java/it/unisannio/ding/ids/wedroid/app/util/ServicesFactory.kt

@@ -0,0 +1,59 @@
+package it.unisannio.ding.ids.wedroid.app.util
+
+import it.unisannio.ding.ids.wedroid.wrapper.api.*
+import okhttp3.OkHttpClient
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+
+object ServicesFactory {
+    private val retrofit: Retrofit
+    private lateinit var reader: PreferenceReader //TODO
+
+    init {
+        val httpClient = OkHttpClient.Builder()
+            .addInterceptor {
+                val request = it.request().newBuilder()
+                    .addHeader("Authorization", "Bearer ${reader.token}")
+                    .addHeader("Accept", "application/json")
+                    .addHeader("Content-type", "application/json")
+                    .build()
+
+                it.proceed(request)
+            }.build()
+
+        retrofit = Retrofit.Builder()
+            .baseUrl(reader.baseUrl)
+            .addConverterFactory(GsonConverterFactory.create())
+            .client(httpClient)
+            .build()
+    }
+
+    val boardService by lazy {
+        retrofit.create(BoardService::class.java)
+    }
+
+    val cardCommentService by lazy {
+        retrofit.create(CardCommentService::class.java)
+    }
+
+    val cardService by lazy {
+        retrofit.create(CardService::class.java)
+    }
+
+    val checklistService by lazy {
+        retrofit.create(ChecklistService::class.java)
+    }
+
+    val listService by lazy {
+        retrofit.create(ListService::class.java)
+    }
+
+    val swimlanesService by lazy {
+        retrofit.create(SwimlanesService::class.java)
+    }
+
+    val userService by lazy {
+        retrofit.create(UserService::class.java)
+    }
+}
+