added implementation

1 files changed, 40 insertions, 0 deletions

diff --git a/src/main/java/eu/ortlepp/notificationsender/util/Config.java b/src/main/java/eu/ortlepp/notificationsender/util/Config.java
new file mode 100644
index 0000000..139ea24
--- /dev/null
+++ b/src/main/java/eu/ortlepp/notificationsender/util/Config.java
@@ -0,0 +1,40 @@
+package eu.ortlepp.notificationsender.util;
+
+import software.amazon.awssdk.regions.Region;
+
+/**
+ * Required configuration values read from environment variables.
+ */
+public final class Config {
+
+  /**
+   * The region of the SNS topic. The Name of the environment variable is REGION.
+   * Value example: eu-central-1
+   */
+  public static final Region REGION;
+
+  /**
+   * The ARN of the SNS topic. The Name of the environment variable is ARN.
+   * Value example: arn:aws:sns:eu-central-1:123456789:Topic-Name
+   */
+  public static final String ARN;
+
+
+  static {
+    REGION = Region.of(getEnvVar("REGION"));
+    ARN = getEnvVar("ARN");
+  }
+
+
+  private static String getEnvVar(final String key) {
+    String value =  System.getenv(key);
+    if (value == null) {
+      throw new RuntimeException("environment variable not set: " + key);
+    }
+    return value;
+  }
+
+
+  private Config() {}
+
+}