Implemented the basic authentication flow, greatly simplifying login

app/build.gradle

@@ -10,8 +10,8 @@ android {
         applicationId "eu.rickvanschijndel.solargraph"
         minSdkVersion 16
         targetSdkVersion 27
-        versionCode 7
-        versionName "1.6"
+        versionCode 8
+        versionName "1.7"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -31,8 +31,6 @@ dependencies {
     implementation 'com.github.PhilJay:MPAndroidChart:v3.0.3'
     implementation 'com.squareup.okhttp3:okhttp:3.10.0'
     implementation 'com.squareup.okhttp3:okhttp-urlconnection:3.10.0'
-    implementation 'com.github.franmontiel:PersistentCookieJar:v1.0.1'
-    implementation 'org.jsoup:jsoup:1.11.3'
     implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
     implementation 'io.reactivex.rxjava2:rxjava:2.1.15'
 

app/src/main/java/eu/rickvanschijndel/solargraph/BasicAuthInterceptor.kt

@@ -0,0 +1,20 @@
+package eu.rickvanschijndel.solargraph
+
+/**
+ * taken from: Alphaaa, https://stackoverflow.com/a/36056355
+ */
+
+import okhttp3.Credentials
+import okhttp3.Interceptor
+import okhttp3.Response
+
+class BasicAuthInterceptor(user: String, password: String): Interceptor {
+    private val credentials = Credentials.basic(user, password)
+
+    override fun intercept(chain: Interceptor.Chain): Response {
+        val request = chain.request()
+        val authenticatedRequest = request.newBuilder()
+                .header("Authorization", credentials).build()
+        return chain.proceed(authenticatedRequest)
+    }
+}