Add electronic signature

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/email_attachment.go

@@ -0,0 +1,105 @@
+// 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 coredata
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"go.gearno.de/kit/pg"
+	"go.probo.inc/probo/pkg/gid"
+)
+
+type (
+	EmailAttachment struct {
+		ID       gid.GID `db:"id"`
+		EmailID  gid.GID `db:"email_id"`
+		FileID   gid.GID `db:"file_id"`
+		Filename string  `db:"filename"`
+		// TODO (to drop)
+		ContentType string    `db:"content_type"`
+		CreatedAt   time.Time `db:"created_at"`
+	}
+
+	EmailAttachments []*EmailAttachment
+)
+
+func NewEmailAttachment(emailID, fileID gid.GID, filename, contentType string) *EmailAttachment {
+	return &EmailAttachment{
+		ID:          gid.New(gid.NilTenant, EmailAttachmentEntityType),
+		EmailID:     emailID,
+		FileID:      fileID,
+		Filename:    filename,
+		ContentType: contentType,
+		CreatedAt:   time.Now(),
+	}
+}
+
+func (a *EmailAttachment) Insert(
+	ctx context.Context,
+	conn pg.Conn,
+) error {
+	q := `
+INSERT INTO email_attachments (id, email_id, file_id, filename, content_type, created_at)
+VALUES (@id, @email_id, @file_id, @filename, @content_type, @created_at)
+`
+	args := pgx.StrictNamedArgs{
+		"id":           a.ID,
+		"email_id":     a.EmailID,
+		"file_id":      a.FileID,
+		"filename":     a.Filename,
+		"content_type": a.ContentType,
+		"created_at":   a.CreatedAt,
+	}
+
+	_, err := conn.Exec(ctx, q, args)
+	if err != nil {
+		return fmt.Errorf("cannot insert email attachment: %w", err)
+	}
+
+	return nil
+}
+
+func (a *EmailAttachments) LoadByEmailID(
+	ctx context.Context,
+	conn pg.Conn,
+	emailID gid.GID,
+) error {
+	q := `
+SELECT id, email_id, file_id, filename, content_type, created_at
+FROM email_attachments
+WHERE email_id = @email_id
+ORDER BY created_at ASC
+`
+	args := pgx.StrictNamedArgs{
+		"email_id": emailID,
+	}
+
+	rows, err := conn.Query(ctx, q, args)
+	if err != nil {
+		return fmt.Errorf("cannot query email attachments: %w", err)
+	}
+
+	attachments, err := pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[EmailAttachment])
+	if err != nil {
+		return fmt.Errorf("cannot collect email attachments: %w", err)
+	}
+
+	*a = attachments
+
+	return nil
+}