feat: add Docker deployment and Microsoft OAuth support

mengpost-backend/services/microsoft.go

@@ -0,0 +1,66 @@
+package services
+
+import (
+	"crypto/tls"
+	"fmt"
+	"strings"
+
+	"mengpost-backend/models"
+)
+
+// 微软个人邮箱常见后缀（Outlook / Hotmail / Live 等）.
+var microsoftConsumerSuffixes = []string{
+	"@outlook.com",
+	"@hotmail.com",
+	"@live.com",
+	"@msn.com",
+}
+
+// IsMicrosoftConsumerEmail 判断是否为消费者微软邮箱（非 Exchange 自建域）.
+func IsMicrosoftConsumerEmail(email string) bool {
+	e := strings.ToLower(strings.TrimSpace(email))
+	for _, suf := range microsoftConsumerSuffixes {
+		if strings.HasSuffix(e, suf) {
+			return true
+		}
+	}
+	return false
+}
+
+// IMAPTLSConfig 为 IMAP TLS 握手提供 ServerName（微软等场景与证书一致）.
+func IMAPTLSConfig(acc *models.Account) *tls.Config {
+	if acc == nil || !acc.UseTLS {
+		return nil
+	}
+	sn := acc.IMAPHost
+	if IsMicrosoftConsumerEmail(acc.Email) && strings.EqualFold(acc.IMAPHost, "outlook.office365.com") {
+		sn = "outlook.office365.com"
+	}
+	return &tls.Config{
+		MinVersion: tls.VersionTLS12,
+		ServerName: sn,
+	}
+}
+
+// SMTPTLSConfig 发信使用 587 STARTTLS 时校验证书（微软 smtp.office365.com）.
+func SMTPTLSConfig(acc *models.Account) *tls.Config {
+	if acc == nil || !IsMicrosoftConsumerEmail(acc.Email) {
+		return nil
+	}
+	if strings.EqualFold(acc.SMTPHost, "smtp.office365.com") {
+		return &tls.Config{
+			MinVersion: tls.VersionTLS12,
+			ServerName: "smtp.office365.com",
+		}
+	}
+	return nil
+}
+
+// WrapMicrosoftMailErr 为微软邮箱附加常见配置说明（IMAP 开关、基础认证与 OAuth）.
+func WrapMicrosoftMailErr(email string, err error) error {
+	if err == nil || !IsMicrosoftConsumerEmail(email) {
+		return err
+	}
+	hint := "（微软邮箱：网页端需开启 IMAP；OAuth 账户无需应用密码。若仍失败请检查令牌是否过期、Azure 权限是否含 IMAP。）"
+	return fmt.Errorf("%w %s", err, hint)
+}