Adding upstream version 0.28.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tools/mailer/sendmail.go

@@ -0,0 +1,99 @@
+package mailer
+
+import (
+	"bytes"
+	"errors"
+	"mime"
+	"net/http"
+	"os/exec"
+	"strings"
+
+	"github.com/pocketbase/pocketbase/tools/hook"
+)
+
+var _ Mailer = (*Sendmail)(nil)
+
+// Sendmail implements [mailer.Mailer] interface and defines a mail
+// client that sends emails via the "sendmail" *nix command.
+//
+// This client is usually recommended only for development and testing.
+type Sendmail struct {
+	onSend *hook.Hook[*SendEvent]
+}
+
+// OnSend implements [mailer.SendInterceptor] interface.
+func (c *Sendmail) OnSend() *hook.Hook[*SendEvent] {
+	if c.onSend == nil {
+		c.onSend = &hook.Hook[*SendEvent]{}
+	}
+	return c.onSend
+}
+
+// Send implements [mailer.Mailer] interface.
+func (c *Sendmail) Send(m *Message) error {
+	if c.onSend != nil {
+		return c.onSend.Trigger(&SendEvent{Message: m}, func(e *SendEvent) error {
+			return c.send(e.Message)
+		})
+	}
+
+	return c.send(m)
+}
+
+func (c *Sendmail) send(m *Message) error {
+	toAddresses := addressesToStrings(m.To, false)
+
+	headers := make(http.Header)
+	headers.Set("Subject", mime.QEncoding.Encode("utf-8", m.Subject))
+	headers.Set("From", m.From.String())
+	headers.Set("Content-Type", "text/html; charset=UTF-8")
+	headers.Set("To", strings.Join(toAddresses, ","))
+
+	cmdPath, err := findSendmailPath()
+	if err != nil {
+		return err
+	}
+
+	var buffer bytes.Buffer
+
+	// write
+	// ---
+	if err := headers.Write(&buffer); err != nil {
+		return err
+	}
+	if _, err := buffer.Write([]byte("\r\n")); err != nil {
+		return err
+	}
+	if m.HTML != "" {
+		if _, err := buffer.Write([]byte(m.HTML)); err != nil {
+			return err
+		}
+	} else {
+		if _, err := buffer.Write([]byte(m.Text)); err != nil {
+			return err
+		}
+	}
+	// ---
+
+	sendmail := exec.Command(cmdPath, strings.Join(toAddresses, ","))
+	sendmail.Stdin = &buffer
+
+	return sendmail.Run()
+}
+
+func findSendmailPath() (string, error) {
+	options := []string{
+		"/usr/sbin/sendmail",
+		"/usr/bin/sendmail",
+		"sendmail",
+	}
+
+	for _, option := range options {
+		path, err := exec.LookPath(option)
+		if err == nil {
+			return path, err
+		}
+	}
+
+	return "", errors.New("failed to locate a sendmail executable path")
+}