Add a Basic Access Authentication Provider

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added a default implementation of `BasicAccessAuthenticationProvider`
+
 ## [0.7.8] - 2023-10-13
 
 ### Fixed

components/abstractions/src/main/java/com/microsoft/kiota/authentication/BasicAccessAuthenticationProvider.java

@@ -0,0 +1,43 @@
+package com.microsoft.kiota.authentication;
+
+import com.microsoft.kiota.RequestInformation;
+import jakarta.annotation.Nonnull;
+import jakarta.annotation.Nullable;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+
+/** Provides an implementation of the Basic Access Authentication scheme: https://en.wikipedia.org/wiki/Basic_access_authentication . */
+public class BasicAccessAuthenticationProvider implements AuthenticationProvider {
+    private final static String AUTHORIZATION_HEADER_KEY = "Authorization";
+    private static final String BASIC = "Basic ";
+
+    private final String username;
+    private final String password;
+    private final String encoded;
+
+    /**
+     * Instantiates a new BasicAccessAuthenticationProvider.
+     * @param username the username to be used.
+     * @param password the password to be used.
+     */
+    public BasicAccessAuthenticationProvider(@Nonnull final String username, @Nonnull final String password) {
+        Objects.requireNonNull(username);
+        Objects.requireNonNull(password);
+
+        this.username = username;
+        this.password = password;
+        encoded = Base64.getEncoder().encodeToString((username + ":" + password).getBytes(StandardCharsets.UTF_8));
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    @Nonnull
+    public CompletableFuture<Void> authenticateRequest(@Nonnull final RequestInformation request, @Nullable final Map<String, Object> additionalAuthenticationContext) {
+        request.headers.add(AUTHORIZATION_HEADER_KEY, BASIC + encoded);
+        return CompletableFuture.completedFuture(null);
+    }
+}