Feat/106 implement authorization logic

auth/src/main/java/eu/project/auth/authz/AuthzManager.kt

@@ -0,0 +1,11 @@
+package eu.project.auth.authz
+
+import eu.project.auth.token.AccessToken
+
+/**
+ * Provides access tokens.
+ */
+interface AuthzManager {
+
+    fun getAccessToken(): AccessToken?
+}

auth/src/main/java/eu/project/auth/authz/AuthzManagerImpl.kt

@@ -0,0 +1,21 @@
+package eu.project.auth.authz
+
+import eu.project.auth.client.SupabaseClient
+import eu.project.auth.token.AccessToken
+import io.github.jan.supabase.auth.auth
+import javax.inject.Inject
+
+/**
+ * Implementation of `AuthzManager` that uses `SupabaseClient` to retrieve access token.
+ */
+internal class AuthzManagerImpl @Inject constructor(supabaseClient: SupabaseClient) : AuthzManager {
+
+    private val client = supabaseClient.client
+
+    override fun getAccessToken(): AccessToken? {
+
+        // try to retrieve current access token, if it's null, return null
+        val rawAccessToken = client.auth.currentAccessTokenOrNull() ?: return null
+        return AccessToken(rawAccessToken)
+    }
+}

auth/src/main/java/eu/project/auth/module/AuthModule.kt

@@ -8,6 +8,8 @@ import dagger.hilt.android.qualifiers.ApplicationContext
 import dagger.hilt.components.SingletonComponent
 import eu.project.auth.authn.AuthnManager
 import eu.project.auth.authn.AuthnManagerImpl
+import eu.project.auth.authz.AuthzManager
+import eu.project.auth.authz.AuthzManagerImpl
 import eu.project.auth.client.SupabaseClient
 import eu.project.auth.credentialManager.GoogleCredentialManager
 import eu.project.auth.credentialManager.GoogleCredentialManagerImpl
@@ -28,6 +30,13 @@ internal class AuthModule {
             googleCredentialManager = googleCredentialManager
         )
 
+    @Provides
+    @Singleton
+    fun provideAuthzManager(
+        supabaseClient: SupabaseClient
+    ): AuthzManager =
+        AuthzManagerImpl(supabaseClient = supabaseClient)
+
     @Provides
     @Singleton
     fun provideGoogleCredentialManager(