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import { basename } from "@std/path";
import { LogFileProvider } from "@crupest/base/log";
import { Mail, MailDeliverContext, MailDeliverer } from "./mail.ts";
export class DovecotMailDeliverer extends MailDeliverer {
readonly name = "dovecot";
readonly #logFileProvider;
readonly #ldaPath;
readonly #doveadmPath;
constructor(
logFileProvider: LogFileProvider,
ldaPath: string,
doveadmPath: string,
) {
super();
this.#logFileProvider = logFileProvider;
this.#ldaPath = ldaPath;
this.#doveadmPath = doveadmPath;
}
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;
}
console.info(`Deliver to dovecot users: ${recipients.join(", ")}.`);
for (const recipient of recipients) {
try {
const commandArgs = ["-d", recipient];
console.info(`Run ${ldaBinName} ${commandArgs.join(" ")}...`);
const ldaCommand = new Deno.Command(ldaPath, {
args: commandArgs,
stdin: "piped",
stdout: "piped",
stderr: "piped",
});
const ldaProcess = ldaCommand.spawn();
using logFiles = await this.#logFileProvider
.createExternalLogStreamsForProgram(
ldaBinName,
);
ldaProcess.stdout.pipeTo(logFiles.stdout);
ldaProcess.stderr.pipeTo(logFiles.stderr);
const stdinWriter = ldaProcess.stdin.getWriter();
await stdinWriter.write(utf8Stream);
await stdinWriter.close();
const status = await ldaProcess.status;
if (status.success) {
context.result.recipients.set(recipient, {
kind: "done",
message: `${ldaBinName} exited with success.`,
});
} else {
let message = `${ldaBinName} exited with error code ${status.code}`;
if (status.signal != null) {
message += ` (signal ${status.signal})`;
}
// https://doc.dovecot.org/main/core/man/dovecot-lda.1.html
switch (status.code) {
case 67:
message += ", recipient user not known";
break;
case 75:
message += ", temporary error";
break;
}
message += ".";
context.result.recipients.set(recipient, { kind: "fail", message });
}
} catch (cause) {
context.result.recipients.set(recipient, {
kind: "fail",
message: "An error is thrown when running lda: " + cause,
cause,
});
}
}
console.info("Done handling all recipients.");
}
async #deleteMail(
user: string,
mailbox: string,
messageId: string,
): Promise<void> {
try {
const args = [
"expunge",
"-u",
user,
"mailbox",
mailbox,
"header",
"Message-ID",
`<${messageId}>`,
];
console.info(
`Run external command ${this.#doveadmPath} ${args.join(" ")} ...`,
);
const command = new Deno.Command(this.#doveadmPath, { args });
const status = await command.spawn().status;
if (status.success) {
console.info("Expunged successfully.");
} else {
console.warn("Expunging failed with exit code %d.", status.code);
}
} catch (cause) {
console.warn("Expunging failed with an error thrown: ", cause);
}
}
async #saveMail(user: string, mailbox: string, mail: Uint8Array) {
try {
const args = ["save", "-u", user, "-m", mailbox];
console.info(
`Run external command ${this.#doveadmPath} ${args.join(" ")} ...`,
);
const command = new Deno.Command(this.#doveadmPath, {
args,
stdin: "piped",
});
const process = command.spawn();
const stdinWriter = process.stdin.getWriter();
await stdinWriter.write(mail);
await stdinWriter.close();
const status = await process.status;
if (status.success) {
console.info("Saved successfully.");
} else {
console.warn("Saving failed with exit code %d.", status.code);
}
} catch (cause) {
console.warn("Saving failed with an error thrown: ", cause);
}
}
async saveNewSent(originalMessageId: string, mail: Mail) {
console.info(
"Try to save mail with new id and delete mail with old id in Sent box.",
);
const from = mail.startSimpleParse().sections().headers()
.from();
if (from != null) {
console.info("Parsed sender (from): ", from);
await this.#saveMail(from, "Sent", mail.toUtf8Bytes());
setTimeout(() => {
console.info(
"Try to delete mail in Sent box that has old message id.",
);
this.#deleteMail(from, "Sent", originalMessageId);
}, 1000 * 15);
} else {
console.warn("Failed to determine from.");
}
}
}
|
