[feature] Parse content warning to HTML, serialize via client API as plaintext (#3876)

* [feature] Parse content warning as HTML, serialize via API to plaintext

* tidy up some cruft

* whoops

* oops

* i'm da joker baybee

* clemency muy lorde

* rename some of the text functions for clarity

* jiggle the opts

* fiddle de deee

* hopefully the last test fix i ever have to do in my beautiful life

3 files changed, 155 insertions, 0 deletions

diff --git a/internal/db/bundb/migrations/20250305205820_content_warning_fixes.go b/internal/db/bundb/migrations/20250305205820_content_warning_fixes.go
new file mode 100644
index 000000000..cf4de834c
--- /dev/null
+++ b/internal/db/bundb/migrations/20250305205820_content_warning_fixes.go
@@ -0,0 +1,61 @@
+// 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 migrations
+
+import (
+	"context"
+	"fmt"
+	"reflect"
+
+	newmodel "github.com/superseriousbusiness/gotosocial/internal/db/bundb/migrations/20250305205820_content_warning_fixes"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/uptrace/bun"
+)
+
+func init() {
+	up := func(ctx context.Context, db *bun.DB) error {
+		return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
+			var newStatus *newmodel.Status
+			newStatusType := reflect.TypeOf(newStatus)
+
+			// Generate new Status.ContentWarningText column definition from bun.
+			colDef, err := getBunColumnDef(tx, newStatusType, "ContentWarningText")
+			if err != nil {
+				return fmt.Errorf("error making column def: %w", err)
+			}
+
+			log.Info(ctx, "adding statuses.content_warning_text column...")
+			_, err = tx.NewAddColumn().Model(newStatus).
+				ColumnExpr(colDef).
+				Exec(ctx)
+			if err != nil {
+				return fmt.Errorf("error adding column: %w", err)
+			}
+
+			return nil
+		})
+	}
+
+	down := func(ctx context.Context, db *bun.DB) error {
+		return nil
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}
diff --git a/internal/db/bundb/migrations/20250305205820_content_warning_fixes/interactionpolicy.go b/internal/db/bundb/migrations/20250305205820_content_warning_fixes/interactionpolicy.go
new file mode 100644
index 000000000..fd0c60a72
--- /dev/null
+++ b/internal/db/bundb/migrations/20250305205820_content_warning_fixes/interactionpolicy.go
@@ -0,0 +1,32 @@
+// 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
+
+type PolicyValue string
+type PolicyValues []PolicyValue
+
+type InteractionPolicy struct {
+	CanLike     PolicyRules
+	CanReply    PolicyRules
+	CanAnnounce PolicyRules
+}
+
+type PolicyRules struct {
+	Always       PolicyValues
+	WithApproval PolicyValues
+}
diff --git a/internal/db/bundb/migrations/20250305205820_content_warning_fixes/status.go b/internal/db/bundb/migrations/20250305205820_content_warning_fixes/status.go
new file mode 100644
index 000000000..b48591937
--- /dev/null
+++ b/internal/db/bundb/migrations/20250305205820_content_warning_fixes/status.go
@@ -0,0 +1,62 @@
+// 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"
+)
+
+type Status struct {
+	ID                       string             `bun:"type:CHAR(26),pk,nullzero,notnull,unique"`
+	CreatedAt                time.Time          `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`
+	EditedAt                 time.Time          `bun:"type:timestamptz,nullzero"`
+	FetchedAt                time.Time          `bun:"type:timestamptz,nullzero"`
+	PinnedAt                 time.Time          `bun:"type:timestamptz,nullzero"`
+	URI                      string             `bun:",unique,nullzero,notnull"`
+	URL                      string             `bun:",nullzero"`
+	Content                  string             `bun:""`
+	AttachmentIDs            []string           `bun:"attachments,array"`
+	TagIDs                   []string           `bun:"tags,array"`
+	MentionIDs               []string           `bun:"mentions,array"`
+	EmojiIDs                 []string           `bun:"emojis,array"`
+	Local                    *bool              `bun:",nullzero,notnull,default:false"`
+	AccountID                string             `bun:"type:CHAR(26),nullzero,notnull"`
+	AccountURI               string             `bun:",nullzero,notnull"`
+	InReplyToID              string             `bun:"type:CHAR(26),nullzero"`
+	InReplyToURI             string             `bun:",nullzero"`
+	InReplyToAccountID       string             `bun:"type:CHAR(26),nullzero"`
+	BoostOfID                string             `bun:"type:CHAR(26),nullzero"`
+	BoostOfAccountID         string             `bun:"type:CHAR(26),nullzero"`
+	ThreadID                 string             `bun:"type:CHAR(26),nullzero"`
+	EditIDs                  []string           `bun:"edits,array"`
+	PollID                   string             `bun:"type:CHAR(26),nullzero"`
+	ContentWarning           string             `bun:",nullzero"`
+	ContentWarningText       string             `bun:""`
+	Visibility               Visibility         `bun:",nullzero,notnull"`
+	Sensitive                *bool              `bun:",nullzero,notnull,default:false"`
+	Language                 string             `bun:",nullzero"`
+	CreatedWithApplicationID string             `bun:"type:CHAR(26),nullzero"`
+	ActivityStreamsType      string             `bun:",nullzero,notnull"`
+	Text                     string             `bun:""`
+	Federated                *bool              `bun:",notnull"`
+	InteractionPolicy        *InteractionPolicy `bun:""`
+	PendingApproval          *bool              `bun:",nullzero,notnull,default:false"`
+	ApprovedByURI            string             `bun:",nullzero"`
+}
+
+type Visibility int16