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import { transformProperties } from "./util.ts";
export const APP_PREFIX = "crupest";
export const APP_NAME = "mailserver";
interface ConfigItemDef {
env: string;
description: string;
default?: string;
secret?: boolean;
}
export const CONFIG_DEFS = {
mailDomain: {
env: "MAIL_DOMAIN",
description: "the part after `@` of an address",
},
dataPath: {
env: "DATA_PATH",
description: "path to save app persistent data",
},
ldaPath: {
env: "LDA_PATH",
description: "full path of lda executable",
"default": "/dovecot/libexec/dovecot/dovecot-lda",
},
inboundFallback: {
env: "INBOUND_FALLBACK",
description: "comma separated addresses used as fallback receipts",
"default": "",
},
awsInboundPath: {
env: "AWS_INBOUND_PATH",
description: "(random set) path for aws sns",
},
awsInboundKey: {
env: "AWS_INBOUND_KEY",
description: "(random set) http header Authorization for aws sns",
},
awsRegion: { env: "AWS_REGION", description: "aws region" },
awsAccessKeyId: { env: "AWS_USER", description: "aws access key id" },
awsSecretAccessKey: {
env: "AWS_PASSWORD",
description: "aws secret access key",
secret: true,
},
awsMailBucket: {
env: "AWS_MAIL_BUCKET",
description: "aws s3 bucket saving raw mails",
secret: true,
},
} as const satisfies Record<string, ConfigItemDef>;
type ConfigDefs = typeof CONFIG_DEFS;
type ConfigKey = keyof ConfigDefs;
type ConfigMap = {
[K in ConfigKey]: ConfigItemDef & { value: string };
};
function getFullEnvKey(key: string): string {
return `${APP_PREFIX.toUpperCase()}_${APP_NAME.toUpperCase()}_${key}`;
}
function resolveAppConfigItem(def: ConfigItemDef): string {
const envKey = getFullEnvKey(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 {
#config = transformProperties(
CONFIG_DEFS,
(def) => ({ ...def, value: resolveAppConfigItem(def) }),
) as ConfigMap;
readonly HTTP_HOST = "0.0.0.0";
readonly HTTP_PORT = 2345;
readonly SMTP_HOST = "127.0.0.1";
readonly SMTP_PORT = 2346;
get<K extends ConfigKey>(key: K): ConfigMap[K] {
return this.#config[key];
}
getValue(key: ConfigKey): string {
return this.get(key).value;
}
getValueList(key: ConfigKey, separator: string = ","): string[] {
const value = this.getValue(key);
if (value.length === 0) return [];
return value.split(separator);
}
[Symbol.for("Deno.customInspect")]() {
return Object.entries(this.#config).map(([key, item]) =>
`${key} [env: ${getFullEnvKey(item.env)}]: ${
item.secret === true ? "***" : item.value
}`
).join("\n");
}
}
const config = new Config();
export default config;
export const getConfigValue = config.getValue.bind(config);
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