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import { basename } from "@std/path";
import { Logger } from "@crupest/base/log";
import { Mail, MailDeliverContext, MailDeliverer } from "./mail.ts";
export class DovecotMailDeliverer extends MailDeliverer {
readonly name = "dovecot";
readonly #ldaPath;
constructor(logger: Logger, ldaPath: string) {
super(logger);
this.#ldaPath = ldaPath;
}
protected override async doDeliver(
mail: Mail,
context: MailDeliverContext,
): Promise<void> {
const ldaPath = this.#ldaPath;
const ldaBinName = basename(ldaPath);
const utf8Stream = mail.toUtf8Bytes();
const recipients = [...context.recipients];
if (recipients.length === 0) {
context.result.message =
"Failed to deliver to dovecot, no recipients are specified.";
return;
}
this.logger.info(`Deliver to dovecot users: ${recipients.join(", ")}.`);
for (const recipient of recipients) {
try {
const commandArgs = ["-d", recipient];
this.logger.info(`Run ${ldaBinName} ${commandArgs.join(" ")}...`);
const ldaCommand = new Deno.Command(ldaPath, {
args: commandArgs,
stdin: "piped",
stdout: "piped",
stderr: "piped",
});
const ldaProcess = ldaCommand.spawn();
using logFiles =
await this.logger.createExternalLogStreamsForProgram(ldaBinName);
ldaProcess.stdout.pipeTo(logFiles.stdout);
ldaProcess.stderr.pipeTo(logFiles.stderr);
const stdinWriter = ldaProcess.stdin.getWriter();
await stdinWriter.write(utf8Stream);
await stdinWriter.close();
const status = await ldaProcess.status;
if (status.success) {
context.result.recipients.set(recipient, {
kind: "done",
message: `${ldaBinName} exited with success.`,
});
} else {
let message = `${ldaBinName} exited with error code ${status.code}`;
if (status.signal != null) {
message += ` (signal ${status.signal})`;
}
// https://doc.dovecot.org/main/core/man/dovecot-lda.1.html
switch (status.code) {
case 67:
message += ", recipient user not known";
break;
case 75:
message += ", temporary error";
break;
}
message += ".";
context.result.recipients.set(recipient, { kind: "fail", message });
}
} catch (cause) {
context.result.recipients.set(recipient, {
kind: "fail",
message: "An error is thrown when running lda: " + cause,
cause,
});
}
}
this.logger.info("Done handling all recipients.");
}
}
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