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import { Mail, MailDeliverContext, MailDeliverer } from "./mail.ts";
// https://doc.dovecot.org/main/core/man/dovecot-lda.1.html
const ldaExitCodeMessageMap = new Map<number, string>();
ldaExitCodeMessageMap.set(67, "recipient user not known");
ldaExitCodeMessageMap.set(75, "temporary error");
type CommandResult = {
kind: "exit-success" | "exit-failure";
status: Deno.CommandStatus;
logMessage: string;
} | { kind: "throw"; cause: unknown; logMessage: string };
async function runCommand(
bin: string,
options: {
args: string[];
stdin?: Uint8Array;
suppressResultLog?: boolean;
errorCodeMessageMap?: Map<number, string>;
},
): Promise<CommandResult> {
const { args, stdin, suppressResultLog, errorCodeMessageMap } = options;
console.info(`Run external command ${bin} ${args.join(" ")}`);
try {
// Create and spawn process.
const command = new Deno.Command(bin, {
args,
stdin: stdin == null ? "null" : "piped",
});
const process = command.spawn();
// Write stdin if any.
if (stdin != null) {
const writer = process.stdin.getWriter();
await writer.write(stdin);
writer.close();
}
// Wait for process to exit.
const status = await process.status;
// Build log message string.
let message = `External command exited with code ${status.code}`;
if (status.signal != null) message += ` (signal: ${status.signal})`;
if (errorCodeMessageMap != null && errorCodeMessageMap.has(status.code)) {
message += `, ${errorCodeMessageMap.get(status.code)}`;
}
message += ".";
suppressResultLog || console.log(message);
// Return result.
return {
kind: status.success ? "exit-success" : "exit-failure",
status,
logMessage: message,
};
} catch (cause) {
const message = `A JS error was thrown when invoking external command:`;
suppressResultLog || console.log(message, cause);
return { kind: "throw", cause, logMessage: message + " " + cause };
}
}
export class DovecotMailDeliverer extends MailDeliverer {
readonly name = "dovecot";
readonly #ldaPath;
readonly #doveadmPath;
constructor(
ldaPath: string,
doveadmPath: string,
) {
super();
this.#ldaPath = ldaPath;
this.#doveadmPath = doveadmPath;
}
protected override async doDeliver(
mail: Mail,
context: MailDeliverContext,
): Promise<void> {
const utf8Bytes = mail.toUtf8Bytes();
const recipients = [...context.recipients];
if (recipients.length === 0) {
throw new Error(
"Failed to deliver to dovecot, no recipients are specified.",
);
}
for (const recipient of recipients) {
const result = await runCommand(
this.#ldaPath,
{
args: ["-d", recipient],
stdin: utf8Bytes,
suppressResultLog: true,
errorCodeMessageMap: ldaExitCodeMessageMap,
},
);
if (result.kind === "exit-success") {
context.result.recipients.set(recipient, {
kind: "success",
message: result.logMessage,
});
} else {
context.result.recipients.set(recipient, {
kind: "failure",
message: result.logMessage,
});
}
}
}
#queryArgs(mailbox: string, messageId: string) {
return ["mailbox", mailbox, "header", "Message-ID", `<${messageId}>`];
}
async #deleteMail(
user: string,
mailbox: string,
messageId: string,
): Promise<void> {
await runCommand(this.#doveadmPath, {
args: ["expunge", "-u", user, ...this.#queryArgs(mailbox, messageId)],
});
}
async #saveMail(user: string, mailbox: string, mail: Uint8Array) {
await runCommand(this.#doveadmPath, {
args: ["save", "-u", user, "-m", mailbox],
stdin: mail,
});
}
async #markAsRead(user: string, mailbox: string, messageId: string) {
await runCommand(this.#doveadmPath, {
args: [
"flags",
"add",
"-u",
user,
"\\Seen",
...this.#queryArgs(mailbox, messageId),
],
});
}
async saveNewSent(mail: Mail, messageIdToDelete: string) {
console.info("Save sent mails and delete ones with old message id.");
// Try to get from and recipients from headers.
const { messageId, from, recipients } = mail.parsed;
if (from == null) {
console.warn("Failed to get sender (from) in headers, skip saving.");
return;
}
if (recipients.has(from)) {
// So the mail should lie in the Inbox.
console.info(
"One recipient of the mail is the sender itself, skip saving.",
);
return;
}
await this.#saveMail(from, "Sent", mail.toUtf8Bytes());
if (messageId != null) {
await this.#markAsRead(from, "Sent", messageId);
} else {
console.warn(
"Message id of the mail is not found, skip marking as read.",
);
}
console.info("Schedule deletion of old mails at 15,30,60 seconds later.");
[15, 30, 60].forEach((seconds) =>
setTimeout(() => {
void this.#deleteMail(from, "Sent", messageIdToDelete);
}, 1000 * seconds)
);
}
}
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