Send mailing list emails

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/mailman/compliance_mailing_list.go

@@ -0,0 +1,161 @@
+// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package mailman
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"go.gearno.de/kit/pg"
+	"go.probo.inc/probo/packages/emails"
+	"go.probo.inc/probo/pkg/baseurl"
+	"go.probo.inc/probo/pkg/coredata"
+	"go.probo.inc/probo/pkg/gid"
+	"go.probo.inc/probo/pkg/mail"
+)
+
+func (s *Service) SubscriptionConfirmationEmailConfig(
+	ctx context.Context,
+	mailingListID gid.GID,
+) (emails.PresenterConfig, string, *mail.Addr, error) {
+	cfg, orgName, _, replyTo, err := s.mailingListEmailConfig(ctx, mailingListID)
+	return cfg, orgName, replyTo, err
+}
+
+func (s *Service) UnsubscribeEmailConfig(
+	ctx context.Context,
+	mailingListID gid.GID,
+) (emails.PresenterConfig, string, *mail.Addr, error) {
+	cfg, orgName, _, replyTo, err := s.mailingListEmailConfig(ctx, mailingListID)
+	return cfg, orgName, replyTo, err
+}
+
+func (s *Service) UpdateEmailConfig(
+	ctx context.Context,
+	mailingListID gid.GID,
+) (emails.PresenterConfig, string, string, *mail.Addr, error) {
+	return s.mailingListEmailConfig(ctx, mailingListID)
+}
+
+func (s *Service) mailingListEmailConfig(
+	ctx context.Context,
+	mailingListID gid.GID,
+) (emails.PresenterConfig, string, string, *mail.Addr, error) {
+	var (
+		mailingList    = &coredata.MailingList{}
+		compliancePage = &coredata.TrustCenter{}
+		organization   = &coredata.Organization{}
+		customDomain   *coredata.CustomDomain
+		logoFile       = &coredata.File{}
+		defaultCfg     = emails.DefaultPresenterConfig(s.bucket, s.apiBaseURL.String())
+	)
+
+	scope := coredata.NewScopeFromObjectID(mailingListID)
+
+	err := s.pg.WithConn(
+		ctx,
+		func(conn pg.Conn) error {
+			if err := mailingList.LoadByID(ctx, conn, scope, mailingListID); err != nil {
+				return fmt.Errorf("cannot load mailing list: %w", err)
+			}
+			if err := compliancePage.LoadByMailingListID(ctx, conn, scope, mailingListID); err != nil {
+				if errors.Is(err, coredata.ErrResourceNotFound) {
+					return err
+				}
+				return fmt.Errorf("cannot load compliance page: %w", err)
+			}
+			if compliancePage.LogoFileID != nil {
+				if err := logoFile.LoadByID(ctx, conn, scope, *compliancePage.LogoFileID); err != nil {
+					return fmt.Errorf("cannot load logo file: %w", err)
+				}
+			}
+			if err := organization.LoadByID(ctx, conn, scope, compliancePage.OrganizationID); err != nil {
+				return fmt.Errorf("cannot load organization: %w", err)
+			}
+			customDomain = &coredata.CustomDomain{}
+			if err := customDomain.LoadByOrganizationID(ctx, conn, scope, organization.ID); err != nil {
+				if !errors.Is(err, coredata.ErrResourceNotFound) {
+					return fmt.Errorf("cannot load custom domain: %w", err)
+				}
+			}
+			return nil
+		},
+	)
+	if err != nil {
+		return defaultCfg, "", "", nil, err
+	}
+
+	cfg, compliancePageURL, err := s.presenterConfigFromTrustCenter(compliancePage, organization, customDomain, logoFile)
+	if err != nil {
+		return defaultCfg, "", "", nil, err
+	}
+
+	compliancePageBase, err := baseurl.Parse(compliancePageURL)
+	if err != nil {
+		return defaultCfg, "", "", nil, fmt.Errorf("cannot parse compliance page URL: %w", err)
+	}
+
+	updatesPageURL, err := compliancePageBase.AppendPath("/updates").String()
+	if err != nil {
+		return defaultCfg, "", "", nil, fmt.Errorf("cannot build updates page URL: %w", err)
+	}
+
+	return cfg, organization.Name, updatesPageURL, mailingList.ReplyTo, nil
+}
+
+func (s *Service) presenterConfigFromTrustCenter(
+	compliancePage *coredata.TrustCenter,
+	organization *coredata.Organization,
+	customDomain *coredata.CustomDomain,
+	logoFile *coredata.File,
+) (emails.PresenterConfig, string, error) {
+	cfg := emails.DefaultPresenterConfig(s.bucket, s.apiBaseURL.String())
+
+	compliancePageBase := s.apiBaseURL.WithPath("/trust/" + compliancePage.ID.String())
+
+	if customDomain != nil && customDomain.SSLStatus == coredata.CustomDomainSSLStatusActive {
+		customBase, err := baseurl.Parse("https://" + customDomain.Domain)
+		if err != nil {
+			return cfg, "", fmt.Errorf("cannot parse custom domain URL: %w", err)
+		}
+		compliancePageBase = customBase.WithPath("")
+	}
+
+	compliancePageURL, err := compliancePageBase.String()
+	if err != nil {
+		return cfg, "", fmt.Errorf("cannot build compliance page URL: %w", err)
+	}
+
+	cfg.BaseURL = compliancePageURL
+
+	if compliancePage.LogoFileID != nil && logoFile != nil && logoFile.FileKey != "" {
+		cfg.SenderCompanyLogo = emails.Asset{
+			Name:       logoFile.FileName,
+			ObjectKey:  logoFile.FileKey,
+			BucketName: logoFile.BucketName,
+			MimeType:   logoFile.MimeType,
+		}
+		cfg.SenderCompanyName = organization.Name
+		if organization.WebsiteURL != nil {
+			cfg.SenderCompanyWebsiteURL = *organization.WebsiteURL
+		}
+		if organization.HeadquarterAddress != nil {
+			cfg.SenderCompanyHeadquarterAddress = *organization.HeadquarterAddress
+		}
+	}
+
+	return cfg, compliancePageURL, nil
+}