[feature] Add List functionality (#1802)

* start working on lists

* further list work

* test list db functions nicely

* more work on lists

* peepoopeepoo

* poke

* start list timeline func

* we're getting there lads

* couldn't be me working on stuff... could it?

* hook up handlers

* fiddling

* weeee

* woah

* screaming, pissing

* fix streaming being a whiny baby

* lint, small test fix, swagger

* tidying up, testing

* fucked! by the linter

* move timelines to state like a boss

* add timeline start to tests using state

* invalidate lists

1 files changed, 51 insertions, 0 deletions

diff --git a/internal/gtsmodel/list.go b/internal/gtsmodel/list.go
new file mode 100644
index 000000000..98188b113
--- /dev/null
+++ b/internal/gtsmodel/list.go
@@ -0,0 +1,51 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package gtsmodel
+
+import "time"
+
+// List refers to a list of follows for which the owning account wants to view a timeline of posts.
+type List struct {
+	ID            string        `validate:"required,ulid" bun:"type:CHAR(26),pk,nullzero,notnull,unique"`               // id of this item in the database
+	CreatedAt     time.Time     `validate:"-" bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`        // when was item created
+	UpdatedAt     time.Time     `validate:"-" bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`        // when was item last updated
+	Title         string        `validate:"required" bun:",nullzero,notnull,unique:listaccounttitle"`                   // Title of this list.
+	AccountID     string        `validate:"required,ulid" bun:"type:CHAR(26),notnull,nullzero,unique:listaccounttitle"` // Account that created/owns the list
+	Account       *Account      `validate:"-" bun:"-"`                                                                  // Account corresponding to accountID
+	ListEntries   []*ListEntry  `validate:"-" bun:"-"`                                                                  // Entries contained by this list.
+	RepliesPolicy RepliesPolicy `validate:"-" bun:",nullzero,notnull,default:'followed'"`                               // RepliesPolicy for this list.
+}
+
+// ListEntry refers to a single follow entry in a list.
+type ListEntry struct {
+	ID        string    `validate:"required,ulid" bun:"type:CHAR(26),pk,nullzero,notnull,unique"`                  // id of this item in the database
+	CreatedAt time.Time `validate:"-" bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`           // when was item created
+	UpdatedAt time.Time `validate:"-" bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`           // when was item last updated
+	ListID    string    `validate:"required,ulid" bun:"type:CHAR(26),notnull,nullzero,unique:listentrylistfollow"` // ID of the list that this entry belongs to.
+	FollowID  string    `validate:"required,ulid" bun:"type:CHAR(26),notnull,nullzero,unique:listentrylistfollow"` // Follow that the account owning this entry wants to see posts of in the timeline.
+	Follow    *Follow   `validate:"-" bun:"-"`                                                                     // Follow corresponding to followID.
+}
+
+// RepliesPolicy denotes which replies should be shown in the list.
+type RepliesPolicy string
+
+const (
+	RepliesPolicyFollowed RepliesPolicy = "followed" // Show replies to any followed user.
+	RepliesPolicyList     RepliesPolicy = "list"     // Show replies to members of the list only.
+	RepliesPolicyNone     RepliesPolicy = "none"     // Don't show replies.
+)