1 files changed, 102 insertions, 0 deletions
diff --git a/deno/mail-relay/dovecot/deliver.ts b/deno/mail-relay/dovecot/deliver.ts
new file mode 100644
index 0000000..92bdc58
--- /dev/null
+++ b/deno/mail-relay/dovecot/deliver.ts
@@ -0,0 +1,102 @@
+import { basename } from "@std/path";
+
+import config from "../config.ts";
+import log from "../log.ts";
+import {
+  Mail,
+  MailDeliverContext,
+  MailDeliverer,
+  RecipientFromHeadersHook,
+} from "../mail.ts";
+
+export class DovecotMailDeliverer extends MailDeliverer {
+  readonly name = "dovecot";
+
+  constructor() {
+    super();
+    this.preHooks.push(
+      new RecipientFromHeadersHook(),
+    );
+  }
+
+  protected override async doDeliver(
+    mail: Mail,
+    context: MailDeliverContext,
+  ): Promise<void> {
+    const ldaPath = config.get("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;
+    }
+
+    log.info(`Deliver to dovecot users: ${recipients.join(", ")}.`);
+
+    for (const recipient of recipients) {
+      try {
+        const commandArgs = ["-d", recipient];
+        log.info(
+          `Run ${ldaBinName} ${commandArgs.join(" ")}...`,
+        );
+
+        const ldaCommand = new Deno.Command(ldaPath, {
+          args: commandArgs,
+          stdin: "piped",
+          stdout: "piped",
+          stderr: "piped",
+        });
+
+        const ldaProcess = ldaCommand.spawn();
+        using logFiles = await log.openLogForProgram(ldaBinName);
+        ldaProcess.stdout.pipeTo(logFiles.stdout.writable);
+        ldaProcess.stderr.pipeTo(logFiles.stderr.writable);
+
+        const stdinWriter = ldaProcess.stdin.getWriter();
+        await stdinWriter.write(utf8Stream);
+        await stdinWriter.close();
+
+        const status = await ldaProcess.status;
+
+        if (status.success) {
+          context.result.recipients.set(recipient, {
+            kind: "done",
+            message: `${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,
+        });
+      }
+    }
+
+    log.info("Done handling all recipients.");
+  }
+}