1 files changed, 56 insertions, 0 deletions
diff --git a/services/docker/mail-server/aws-sendmail/config.ts b/services/docker/mail-server/aws-sendmail/config.ts
new file mode 100644
index 0000000..0212029
--- /dev/null
+++ b/services/docker/mail-server/aws-sendmail/config.ts
@@ -0,0 +1,56 @@
+import { createSingleton, transformProperties } from "./util.ts";
+
+export const APP_PREFIX = "crupest";
+export const APP_NAME = "mailserver";
+
+interface ConfigItemDef {
+  env: string;
+  description: string;
+  default?: string;
+}
+
+export const CONFIG_DEFS = {
+  awsAccessKeyId: { env: "AWS_USER", description: "aws access key id" },
+  awsSecretAccessKey: {
+    env: "AWS_PASSWORD",
+    description: "aws secret access key",
+  },
+  awsMailBucket: {
+    env: "AWS_MAIL_BUCKET",
+    description: "aws s3 bucket saving raw mails",
+  },
+} as const satisfies Record<string, ConfigItemDef>;
+
+type ConfigDefs = typeof CONFIG_DEFS;
+type ConfigKey = keyof ConfigDefs;
+type ConfigMap = {
+  [K in ConfigKey]: ConfigDefs[K] & { value: string };
+};
+
+function resolveAppConfigItem(def: ConfigItemDef): string {
+  const envKey =
+    `${APP_PREFIX.toUpperCase()}_${APP_NAME.toUpperCase()}_${def.env}`;
+  const value = Deno.env.get(envKey);
+  if (value != null) return value;
+  if (def.default != null) return def.default;
+  throw new Error(
+    `Required env ${envKey} (${def.description}) is not set.`,
+  );
+}
+
+export class Config {
+  private config = transformProperties(
+    CONFIG_DEFS,
+    (def) => ({ ...def, value: resolveAppConfigItem(def) }),
+  ) as ConfigMap;
+
+  get<K extends ConfigKey>(key: K): ConfigMap[K] {
+    return this.config[key];
+  }
+
+  getValue(key: ConfigKey): string {
+    return this.get(key).value;
+  }
+}
+
+export const [getConfig, setConfig] = createSingleton<Config>("Config");