Merge c8fb4c17f1 into fab7d17031

Allow instance admins to add custom CSS that will affect
every page of their instance.

This is done with a new CustomCSS instance setting that
works pretty much exactly like the Users CustomCSS property.
This custom CSS is then requested for every page load.
User styles/themes take precedence over this CSS.

docs/admin/settings.md

@@ -167,3 +167,11 @@ Links to the set contact account and/or email address will appear on the footer
 The selected **contact user** must be an active (not suspended) admin and/or moderator on the instance.
 
 If you're on a single-user instance and you give admin privileges to your main account, you can just fill in your own username here; you don't need to make a separate admin account just for this.
+
+### Instance Custom CSS
+
+custom CSS allows you to further customize the way your instance looks when visited through a browser.
+
+This custom CSS will be applied to all pages of your instance. Users themes and CSS still take precedence over this customization.
+
+See the [Custom CSS](./custom_css.md) page for some tips on writing custom CSS for your instance.

docs/api/swagger.yaml

@@ -1550,6 +1550,10 @@ definitions:
                 $ref: '#/definitions/instanceV1Configuration'
             contact_account:
                 $ref: '#/definitions/account'
+            custom_css:
+                description: Custom CSS for the instance.
+                type: string
+                x-go-name: CustomCSS
             debug:
                 description: Whether or not instance is running in DEBUG mode. Omitted if false.
                 type: boolean
@@ -1730,6 +1734,10 @@ definitions:
                 $ref: '#/definitions/instanceV2Configuration'
             contact:
                 $ref: '#/definitions/instanceV2Contact'
+            custom_css:
+                description: Instance Custom Css
+                type: string
+                x-go-name: CustomCSS
             debug:
                 description: Whether or not instance is running in DEBUG mode. Omitted if false.
                 type: boolean

internal/api/client/instance/instancepatch.go

@@ -175,6 +175,7 @@ func validateInstanceUpdate(form *apimodel.InstanceSettingsUpdateRequest) error
 		form.ContactEmail == nil &&
 		form.ShortDescription == nil &&
 		form.Description == nil &&
+		form.CustomCSS == nil &&
 		form.Terms == nil &&
 		form.Avatar == nil &&
 		form.AvatarDescription == nil &&

internal/api/client/instance/instancepatch_test.go

@@ -858,7 +858,7 @@ func (suite *InstancePatchTestSuite) TestInstancePatch8() {
   "static_url": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/small/`+instanceAccount.AvatarMediaAttachment.ID+`.webp",`+`
   "thumbnail_static_type": "image/webp",
   "thumbnail_description": "A bouncing little green peglin.",
-  "blurhash": "LE9801Rl4Yt5%dWCV]t5Dmoex?WC"
+  "blurhash": "LF9Hm*Rl4Yt5.4RlRSt5IXkBxsj["
 }`, string(instanceV2ThumbnailJson))
 
 	// double extra special bonus: now update the image description without changing the image

internal/api/client/streaming/stream.go

@@ -35,6 +35,8 @@
 	"github.com/gorilla/websocket"
 )
 
+var pingMsg = []byte("ping!")
+
 // StreamGETHandler swagger:operation GET /api/v1/streaming streamGet
 //
 // Initiate a websocket connection for live streaming of statuses and notifications.
@@ -389,40 +391,57 @@ func (m *Module) writeToWSConn(
 ) {
 	for {
 		// Wrap context with timeout to send a ping.
-		pingctx, cncl := context.WithTimeout(ctx, ping)
+		pingCtx, cncl := context.WithTimeout(ctx, ping)
 
-		// Block on receipt of msg.
+		// Block and wait for
-		msg, ok := stream.Recv(pingctx)
+		// one of the following:
+		//
+		// - receipt of msg
+		// - timeout of pingCtx
+		// - stream closed.
+		msg, haveMsg := stream.Recv(pingCtx)
 
-		// Check if cancel because ping.
+		// If ping context has timed
-		pinged := (pingctx.Err() != nil)
+		// out, we should send a ping.
+		//
+		// In any case cancel pingCtx
+		// as we're done with it.
+		shouldPing := (pingCtx.Err() != nil)
 		cncl()
 
 		switch {
-		case !ok && pinged:
+		case !haveMsg && !shouldPing:
-			// The ping context timed out!
+			// We have no message and we shouldn't
-			l.Trace("writing websocket ping")
+			// send a ping; this means the stream
+			// has been closed from the client's end,
+			// so there's nothing further to do here.
+			l.Trace("no message and we shouldn't ping, returning...")
+			return
 
-			// Wrapped context time-out, send a keep-alive "ping".
+		case haveMsg:
-			if err := wsConn.WriteControl(websocket.PingMessage, nil, time.Time{}); err != nil {
+			// We have a message to stream.
-				l.Debugf("error writing websocket ping: %v", err)
+			l.Tracef("writing websocket message: %+v", msg)
-				break
-			}
 
-		case !ok:
+			if err := wsConn.WriteJSON(msg); err != nil {
-			// Stream was
+				// If there's an error writing then drop the
-			// closed.
+				// connection, as client may have disappeared
+				// suddenly; they can reconnect if necessary.
+				l.Debugf("error writing websocket message: %v", err)
 				return
 			}
 
-		l.Trace("writing websocket message: %+v", msg)
+		case shouldPing:
+			// We have no message but we do
+			// need to send a keep-alive ping.
+			l.Trace("writing websocket ping")
 
-		// Received a new message from the processor.
+			if err := wsConn.WriteControl(websocket.PingMessage, pingMsg, time.Time{}); err != nil {
-		if err := wsConn.WriteJSON(msg); err != nil {
+				// If there's an error writing then drop the
-			l.Debugf("error writing websocket message: %v", err)
+				// connection, as client may have disappeared
-			break
+				// suddenly; they can reconnect if necessary.
+				l.Debugf("error writing websocket ping: %v", err)
+				return
+			}
 		}
 	}
-
-	l.Debug("finished websocket write")
 }

internal/api/model/instance.go

@@ -33,6 +33,8 @@ type InstanceSettingsUpdateRequest struct {
 	ShortDescription *string `form:"short_description" json:"short_description" xml:"short_description"`
 	// Longer description of the instance, max 5,000 chars. HTML formatting accepted.
 	Description *string `form:"description" json:"description" xml:"description"`
+	// Custom CSS for the instance.
+	CustomCSS *string `form:"custom_css" json:"custom_css,omitempty" xml:"custom_css"`
 	// Terms and conditions of the instance, max 5,000 chars. HTML formatting accepted.
 	Terms *string `form:"terms" json:"terms" xml:"terms"`
 	// Image to use as the instance thumbnail.

internal/api/model/instancev1.go

@@ -38,6 +38,8 @@ type InstanceV1 struct {
 	//
 	// This should be displayed on the 'about' page for an instance.
 	Description string `json:"description"`
+	// Custom CSS for the instance.
+	CustomCSS string `json:"custom_css,omitempty"`
 	// Raw (unparsed) version of description.
 	DescriptionText string `json:"description_text,omitempty"`
 	// A shorter description of the instance.

internal/api/model/instancev2.go

@@ -53,6 +53,8 @@ type InstanceV2 struct {
 	Description string `json:"description"`
 	// Raw (unparsed) version of description.
 	DescriptionText string `json:"description_text,omitempty"`
+	// Instance Custom Css
+	CustomCSS string `json:"custom_css,omitempty"`
 	// Basic anonymous usage data for this instance.
 	Usage InstanceV2Usage `json:"usage"`
 	// An image used to represent this instance.

internal/db/bundb/filter_test.go

@@ -247,6 +247,54 @@ func (suite *FilterTestSuite) TestFilterCRUD() {
 	}
 }
 
+func (suite *FilterTestSuite) TestFilterTitleOverlap() {
+	var (
+		ctx      = context.Background()
+		account1 = "01HNEJXCPRTJVJY9MV0VVHGD47"
+		account2 = "01JAG5BRJPJYA0FSA5HR2MMFJH"
+	)
+
+	// Create an empty filter for account 1.
+	account1filter1 := &gtsmodel.Filter{
+		ID:          "01HNEJNVZZVXJTRB3FX3K2B1YF",
+		AccountID:   account1,
+		Title:       "my filter",
+		Action:      gtsmodel.FilterActionWarn,
+		ContextHome: util.Ptr(true),
+	}
+	if err := suite.db.PutFilter(ctx, account1filter1); err != nil {
+		suite.FailNow("", "error putting account1filter1: %s", err)
+	}
+
+	// Create a filter for account 2 with
+	// the same title, should be no issue.
+	account2filter1 := &gtsmodel.Filter{
+		ID:          "01JAG5GPXG7H5Y4ZP78GV1F2ET",
+		AccountID:   account2,
+		Title:       "my filter",
+		Action:      gtsmodel.FilterActionWarn,
+		ContextHome: util.Ptr(true),
+	}
+	if err := suite.db.PutFilter(ctx, account2filter1); err != nil {
+		suite.FailNow("", "error putting account2filter1: %s", err)
+	}
+
+	// Try to create another filter for
+	// account 1 with the same name as
+	// an existing filter of theirs.
+	account1filter2 := &gtsmodel.Filter{
+		ID:          "01JAG5J8NYKQE2KYCD28Y4P05V",
+		AccountID:   account1,
+		Title:       "my filter",
+		Action:      gtsmodel.FilterActionWarn,
+		ContextHome: util.Ptr(true),
+	}
+	err := suite.db.PutFilter(ctx, account1filter2)
+	if !errors.Is(err, db.ErrAlreadyExists) {
+		suite.FailNow("", "wanted ErrAlreadyExists, got %s", err)
+	}
+}
+
 func TestFilterTestSuite(t *testing.T) {
 	suite.Run(t, new(FilterTestSuite))
 }

internal/db/bundb/migrations/20240126064004_add_filters.go

@@ -20,7 +20,7 @@
 import (
 	"context"
 
-	gtsmodel "github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	gtsmodel "github.com/superseriousbusiness/gotosocial/internal/db/bundb/migrations/20240126064004_add_filters"
 	"github.com/uptrace/bun"
 )
 

internal/db/bundb/migrations/20240126064004_add_filters/filter.go

@@ -0,0 +1,65 @@
+// 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 (
+	"regexp"
+	"time"
+)
+
+// Filter stores a filter created by a local account.
+type Filter struct {
+	ID                   string           `bun:"type:CHAR(26),pk,nullzero,notnull,unique"`                    // id of this item in the database
+	CreatedAt            time.Time        `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // when was item created
+	UpdatedAt            time.Time        `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // when was item last updated
+	ExpiresAt            time.Time        `bun:"type:timestamptz,nullzero"`                                   // Time filter should expire. If null, should not expire.
+	AccountID            string           `bun:"type:CHAR(26),notnull,nullzero"`                              // ID of the local account that created the filter.
+	Title                string           `bun:",nullzero,notnull,unique"`                                    // The name of the filter.
+	Action               string           `bun:",nullzero,notnull"`                                           // The action to take.
+	Keywords             []*FilterKeyword `bun:"-"`                                                           // Keywords for this filter.
+	Statuses             []*FilterStatus  `bun:"-"`                                                           // Statuses for this filter.
+	ContextHome          *bool            `bun:",nullzero,notnull,default:false"`                             // Apply filter to home timeline and lists.
+	ContextNotifications *bool            `bun:",nullzero,notnull,default:false"`                             // Apply filter to notifications.
+	ContextPublic        *bool            `bun:",nullzero,notnull,default:false"`                             // Apply filter to home timeline and lists.
+	ContextThread        *bool            `bun:",nullzero,notnull,default:false"`                             // Apply filter when viewing a status's associated thread.
+	ContextAccount       *bool            `bun:",nullzero,notnull,default:false"`                             // Apply filter when viewing an account profile.
+}
+
+// FilterKeyword stores a single keyword to filter statuses against.
+type FilterKeyword struct {
+	ID        string         `bun:"type:CHAR(26),pk,nullzero,notnull,unique"`                                     // id of this item in the database
+	CreatedAt time.Time      `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`                  // when was item created
+	UpdatedAt time.Time      `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`                  // when was item last updated
+	AccountID string         `bun:"type:CHAR(26),notnull,nullzero"`                                               // ID of the local account that created the filter keyword.
+	FilterID  string         `bun:"type:CHAR(26),notnull,nullzero,unique:filter_keywords_filter_id_keyword_uniq"` // ID of the filter that this keyword belongs to.
+	Filter    *Filter        `bun:"-"`                                                                            // Filter corresponding to FilterID
+	Keyword   string         `bun:",nullzero,notnull,unique:filter_keywords_filter_id_keyword_uniq"`              // The keyword or phrase to filter against.
+	WholeWord *bool          `bun:",nullzero,notnull,default:false"`                                              // Should the filter consider word boundaries?
+	Regexp    *regexp.Regexp `bun:"-"`                                                                            // pre-prepared regular expression
+}
+
+// FilterStatus stores a single status to filter.
+type FilterStatus struct {
+	ID        string    `bun:"type:CHAR(26),pk,nullzero,notnull,unique"`                                       // id of this item in the database
+	CreatedAt time.Time `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`                    // when was item created
+	UpdatedAt time.Time `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`                    // when was item last updated
+	AccountID string    `bun:"type:CHAR(26),notnull,nullzero"`                                                 // ID of the local account that created the filter keyword.
+	FilterID  string    `bun:"type:CHAR(26),notnull,nullzero,unique:filter_statuses_filter_id_status_id_uniq"` // ID of the filter that this keyword belongs to.
+	Filter    *Filter   `bun:"-"`                                                                              // Filter corresponding to FilterID
+	StatusID  string    `bun:"type:CHAR(26),notnull,nullzero,unique:filter_statuses_filter_id_status_id_uniq"` // ID of the status to filter.
+}

internal/db/bundb/migrations/20240924222938_add_instance_custom_css.go

@@ -0,0 +1,44 @@
+// 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"
+	"strings"
+
+	"github.com/uptrace/bun"
+)
+
+func init() {
+	up := func(ctx context.Context, db *bun.DB) error {
+		_, err := db.ExecContext(ctx, "ALTER TABLE ? ADD COLUMN ? TEXT", bun.Ident("instances"), bun.Ident("custom_css"))
+		if err != nil && !(strings.Contains(err.Error(), "already exists") || strings.Contains(err.Error(), "duplicate column name") || strings.Contains(err.Error(), "SQLSTATE 42701")) {
+			return err
+		}
+		return nil
+	}
+
+	down := func(ctx context.Context, db *bun.DB) error {
+		_, err := db.ExecContext(ctx, "ALTER TABLE ? DROP COLUMN ?", bun.Ident("instances"), bun.Ident("custom_css"))
+		return err
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}

internal/db/bundb/migrations/20241018151036_filter_unique_fix.go

@@ -0,0 +1,131 @@
+// 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"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/dialect"
+)
+
+func init() {
+	up := func(ctx context.Context, db *bun.DB) error {
+		return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
+
+			// Create the new filters table
+			// with the unique constraint
+			// set on AccountID + Title.
+			if _, err := tx.
+				NewCreateTable().
+				ModelTableExpr("new_filters").
+				Model((*gtsmodel.Filter)(nil)).
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			// Explicitly specify columns to bring
+			// from old table to new, to avoid any
+			// potential Postgres shenanigans.
+			columns := []string{
+				"id",
+				"created_at",
+				"updated_at",
+				"expires_at",
+				"account_id",
+				"title",
+				"action",
+				"context_home",
+				"context_notifications",
+				"context_public",
+				"context_thread",
+				"context_account",
+			}
+
+			// Copy all data for existing
+			// filters to the new table.
+			if _, err := tx.
+				NewInsert().
+				Table("new_filters").
+				Table("filters").
+				Column(columns...).
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			// Drop the old table.
+			if _, err := tx.
+				NewDropTable().
+				Table("filters").
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			// Rename new table to old table.
+			if _, err := tx.
+				ExecContext(
+					ctx,
+					"ALTER TABLE ? RENAME TO ?",
+					bun.Ident("new_filters"),
+					bun.Ident("filters"),
+				); err != nil {
+				return err
+			}
+
+			// Index the new version
+			// of the filters table.
+			if _, err := tx.
+				NewCreateIndex().
+				Table("filters").
+				Index("filters_account_id_idx").
+				Column("account_id").
+				IfNotExists().
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			if db.Dialect().Name() == dialect.PG {
+				// Rename "new_filters_pkey" from the
+				// new table to just "filters_pkey".
+				// This is only necessary on Postgres.
+				if _, err := tx.ExecContext(
+					ctx,
+					"ALTER TABLE ? RENAME CONSTRAINT ? TO ?",
+					bun.Ident("public.filters"),
+					bun.Safe("new_filters_pkey"),
+					bun.Safe("filters_pkey"),
+				); err != nil {
+					return err
+				}
+			}
+
+			return nil
+		})
+	}
+
+	down := func(ctx context.Context, db *bun.DB) error {
+		return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
+			return nil
+		})
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}

internal/gtsmodel/filter.go

@@ -30,8 +30,8 @@ type Filter struct {
 	CreatedAt            time.Time        `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`         // when was item created
 	UpdatedAt            time.Time        `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"`         // when was item last updated
 	ExpiresAt            time.Time        `bun:"type:timestamptz,nullzero"`                                           // Time filter should expire. If null, should not expire.
-	AccountID            string           `bun:"type:CHAR(26),notnull,nullzero"`                              // ID of the local account that created the filter.
+	AccountID            string           `bun:"type:CHAR(26),notnull,nullzero,unique:filters_account_id_title_uniq"` // ID of the local account that created the filter.
-	Title                string           `bun:",nullzero,notnull,unique"`                                    // The name of the filter.
+	Title                string           `bun:",nullzero,notnull,unique:filters_account_id_title_uniq"`              // The name of the filter.
 	Action               FilterAction     `bun:",nullzero,notnull"`                                                   // The action to take.
 	Keywords             []*FilterKeyword `bun:"-"`                                                                   // Keywords for this filter.
 	Statuses             []*FilterStatus  `bun:"-"`                                                                   // Statuses for this filter.

internal/gtsmodel/instance.go

@@ -34,6 +34,7 @@ type Instance struct {
 	ShortDescriptionText   string       `bun:""`                                                            // Raw text version of short description (before parsing).
 	Description            string       `bun:""`                                                            // Longer description of this instance.
 	DescriptionText        string       `bun:""`                                                            // Raw text version of long description (before parsing).
+	CustomCSS              string       `bun:",nullzero"`                                                   // Custom CSS for the instance.
 	Terms                  string       `bun:""`                                                            // Terms and conditions of this instance.
 	TermsText              string       `bun:""`                                                            // Raw text version of terms (before parsing).
 	ContactEmail           string       `bun:""`                                                            // Contact email address for this instance

internal/media/ffmpeg.go

@@ -78,23 +78,17 @@ func ffmpegGenerateWebpThumb(ctx context.Context, inpath, outpath string, width,
 		// (NOT as libwebp_anim).
 		"-codec:v", "libwebp",
 
-		// Select thumb from first 7 frames.
+		// Only one frame
-		// (in particular <= 7 reduced memory usage, marginally)
+		"-frames:v", "1",
-		// (thumb filter: https://ffmpeg.org/ffmpeg-filters.html#thumbnail)
-		"-filter:v", "thumbnail=n=7,"+
 
 		// Scale to dimensions
 		// (scale filter: https://ffmpeg.org/ffmpeg-filters.html#scale)
-			"scale="+strconv.Itoa(width)+
+		"-filter:v", "scale="+strconv.Itoa(width)+":"+strconv.Itoa(height)+","+
-			":"+strconv.Itoa(height)+","+
 
 			// Attempt to use original pixel format
 			// (format filter: https://ffmpeg.org/ffmpeg-filters.html#format)
 			"format=pix_fmts="+pixfmt,
 
-		// Only one frame
-		"-frames:v", "1",
-
 		// Quality not specified,
 		// i.e. use default which
 		// should be 75% webp quality.

internal/media/manager_test.go

@@ -428,7 +428,7 @@ func (suite *ManagerTestSuite) TestSlothVineProcess() {
 	suite.Equal("video/mp4", attachment.File.ContentType)
 	suite.Equal("image/webp", attachment.Thumbnail.ContentType)
 	suite.Equal(312453, attachment.File.FileSize)
-	suite.Equal(5648, attachment.Thumbnail.FileSize)
+	suite.Equal(5598, attachment.Thumbnail.FileSize)
 	suite.Equal("LgIYH}xtNsofxtfPW.j[_4axn+of", attachment.Blurhash)
 
 	// now make sure the attachment is in the database
@@ -441,6 +441,71 @@ func (suite *ManagerTestSuite) TestSlothVineProcess() {
 	equalFiles(suite.T(), suite.state.Storage, dbAttachment.Thumbnail.Path, "./test/test-mp4-thumbnail.webp")
 }
 
+func (suite *ManagerTestSuite) TestAnimatedGifProcess() {
+	ctx := context.Background()
+
+	data := func(_ context.Context) (io.ReadCloser, error) {
+		// load bytes from a test image
+		b, err := os.ReadFile("./test/clock-original.gif")
+		if err != nil {
+			panic(err)
+		}
+		return io.NopCloser(bytes.NewBuffer(b)), nil
+	}
+
+	accountID := "01FS1X72SK9ZPW0J1QQ68BD264"
+
+	// process the media with no additional info provided
+	processing, err := suite.manager.CreateMedia(ctx,
+		accountID,
+		data,
+		media.AdditionalMediaInfo{},
+	)
+	suite.NoError(err)
+	suite.NotNil(processing)
+
+	// do a blocking call to fetch the attachment
+	attachment, err := processing.Load(ctx)
+	suite.NoError(err)
+	suite.NotNil(attachment)
+
+	// make sure it's got the stuff set on it that we expect
+	// the attachment ID and accountID we expect
+	suite.Equal(processing.ID(), attachment.ID)
+	suite.Equal(accountID, attachment.AccountID)
+
+	// file meta should be correctly derived from the image
+	suite.EqualValues(gtsmodel.Original{
+		Width:     528,
+		Height:    528,
+		Size:      278784,
+		Aspect:    1,
+		Duration:  util.Ptr(float32(8.58)),
+		Framerate: util.Ptr(float32(16)),
+		Bitrate:   util.Ptr(uint64(114092)),
+	}, attachment.FileMeta.Original)
+	suite.EqualValues(gtsmodel.Small{
+		Width:  512,
+		Height: 512,
+		Size:   262144,
+		Aspect: 1,
+	}, attachment.FileMeta.Small)
+	suite.Equal("image/gif", attachment.File.ContentType)
+	suite.Equal("image/webp", attachment.Thumbnail.ContentType)
+	suite.Equal(122364, attachment.File.FileSize)
+	suite.Equal(12962, attachment.Thumbnail.FileSize)
+	suite.Equal("LmKUZkt700ofoffQofj[00WBj[WB", attachment.Blurhash)
+
+	// now make sure the attachment is in the database
+	dbAttachment, err := suite.db.GetAttachmentByID(ctx, attachment.ID)
+	suite.NoError(err)
+	suite.NotNil(dbAttachment)
+
+	// ensure the files contain the expected data.
+	equalFiles(suite.T(), suite.state.Storage, dbAttachment.File.Path, "./test/clock-processed.gif")
+	equalFiles(suite.T(), suite.state.Storage, dbAttachment.Thumbnail.Path, "./test/clock-thumbnail.webp")
+}
+
 func (suite *ManagerTestSuite) TestLongerMp4Process() {
 	ctx := context.Background()
 
@@ -488,8 +553,8 @@ func (suite *ManagerTestSuite) TestLongerMp4Process() {
 	suite.Equal("video/mp4", attachment.File.ContentType)
 	suite.Equal("image/webp", attachment.Thumbnail.ContentType)
 	suite.Equal(109569, attachment.File.FileSize)
-	suite.Equal(2976, attachment.Thumbnail.FileSize)
+	suite.Equal(2958, attachment.Thumbnail.FileSize)
-	suite.Equal("LIQJfl_3IU?b~qM{ofayWBWVofRj", attachment.Blurhash)
+	suite.Equal("LIQ9}}_3IU?b~qM{ofayWBWVofRj", attachment.Blurhash)
 
 	// now make sure the attachment is in the database
 	dbAttachment, err := suite.db.GetAttachmentByID(ctx, attachment.ID)
@@ -548,8 +613,8 @@ func (suite *ManagerTestSuite) TestBirdnestMp4Process() {
 	suite.Equal("video/mp4", attachment.File.ContentType)
 	suite.Equal("image/webp", attachment.Thumbnail.ContentType)
 	suite.Equal(1409625, attachment.File.FileSize)
-	suite.Equal(14478, attachment.Thumbnail.FileSize)
+	suite.Equal(15056, attachment.Thumbnail.FileSize)
-	suite.Equal("LLF$qyaeRO.9DgM_RPaetkV@WCMw", attachment.Blurhash)
+	suite.Equal("LLF$nqafRO.9DgM_RPadtkV@WCMx", attachment.Blurhash)
 
 	// now make sure the attachment is in the database
 	dbAttachment, err := suite.db.GetAttachmentByID(ctx, attachment.ID)

internal/processing/instance.go

@@ -227,6 +227,17 @@ func (p *Processor) InstancePatch(ctx context.Context, form *apimodel.InstanceSe
 		columns = append(columns, []string{"description", "description_text"}...)
 	}
 
+	// validate & update site custom css if it's set on the form
+	if form.CustomCSS != nil {
+		customCSS := *form.CustomCSS
+		if err := validate.InstanceCustomCSS(customCSS); err != nil {
+			return nil, gtserror.NewErrorBadRequest(err, err.Error())
+		}
+
+		instance.CustomCSS = text.SanitizeToPlaintext(customCSS)
+		columns = append(columns, []string{"custom_css"}...)
+	}
+
 	// Validate & update site
 	// terms if set on the form.
 	if form.Terms != nil {

internal/typeutils/internaltofrontend.go

@@ -1523,6 +1523,7 @@ func (c *Converter) InstanceToAPIV1Instance(ctx context.Context, i *gtsmodel.Ins
 		Title:                i.Title,
 		Description:          i.Description,
 		DescriptionText:      i.DescriptionText,
+		CustomCSS:            i.CustomCSS,
 		ShortDescription:     i.ShortDescription,
 		ShortDescriptionText: i.ShortDescriptionText,
 		Email:                i.ContactEmail,
@@ -1644,6 +1645,7 @@ func (c *Converter) InstanceToAPIV2Instance(ctx context.Context, i *gtsmodel.Ins
 		SourceURL:       instanceSourceURL,
 		Description:     i.Description,
 		DescriptionText: i.DescriptionText,
+		CustomCSS:       i.CustomCSS,
 		Usage:           apimodel.InstanceV2Usage{}, // todo: not implemented
 		Languages:       config.GetInstanceLanguages().TagStrs(),
 		Rules:           c.InstanceRulesToAPIRules(i.Rules),

internal/validate/formvalidation.go

@@ -189,6 +189,16 @@ func CustomCSS(customCSS string) error {
 	return nil
 }
 
+func InstanceCustomCSS(customCSS string) error {
+
+	maximumCustomCSSLength := config.GetAccountsCustomCSSLength()
+	if length := len([]rune(customCSS)); length > maximumCustomCSSLength {
+		return fmt.Errorf("custom_css must be less than %d characters, but submitted custom_css was %d characters", maximumCustomCSSLength, length)
+	}
+
+	return nil
+}
+
 // EmojiShortcode just runs the given shortcode through the regular expression
 // for emoji shortcodes, to figure out whether it's a valid shortcode, ie., 2-30 characters,
 // a-zA-Z, numbers, and underscores.

internal/web/about.go

@@ -54,7 +54,7 @@ func (m *Module) aboutGETHandler(c *gin.Context) {
 		Template:    "about.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssAbout},
+		Stylesheets: []string{cssAbout, instanceCustomCSSPath},
 		Extra: map[string]any{
 			"showStrap":        true,
 			"blocklistExposed": config.GetInstanceExposeSuspendedWeb(),

internal/web/confirmemail.go

@@ -129,6 +129,7 @@ func (m *Module) confirmEmailPOSTHandler(c *gin.Context) {
 	page := apiutil.WebPage{
 		Template:    "confirmed_email.tmpl",
 		Instance:    instance,
+		Stylesheets: []string{instanceCustomCSSPath},
 		Extra: map[string]any{
 			"email":    user.Email,
 			"username": user.Account.Username,

internal/web/customcss.go

@@ -55,3 +55,22 @@ func (m *Module) customCSSGETHandler(c *gin.Context) {
 	c.Header(cacheControlHeader, cacheControlNoCache)
 	c.Data(http.StatusOK, textCSSUTF8, []byte(customCSS))
 }
+
+func (m *Module) instanceCustomCSSGETHandler(c *gin.Context) {
+
+	if _, err := apiutil.NegotiateAccept(c, apiutil.TextCSS); err != nil {
+		apiutil.WebErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	instanceV1, errWithCode := m.processor.InstanceGetV1(c.Request.Context())
+	if errWithCode != nil {
+		apiutil.WebErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	instanceCustomCSS := instanceV1.CustomCSS
+
+	c.Header(cacheControlHeader, cacheControlNoCache)
+	c.Data(http.StatusOK, textCSSUTF8, []byte(instanceCustomCSS))
+}

internal/web/domain-blocklist.go

@@ -67,7 +67,7 @@ func (m *Module) domainBlockListGETHandler(c *gin.Context) {
 		Template:    "domain-blocklist.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssFA},
+		Stylesheets: []string{cssFA, instanceCustomCSSPath},
 		Javascript:  []string{jsFrontend},
 		Extra:       map[string]any{"blocklist": domainBlocks},
 	}

internal/web/index.go

@@ -59,7 +59,7 @@ func (m *Module) indexHandler(c *gin.Context) {
 		Template:    "index.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssAbout, cssIndex},
+		Stylesheets: []string{cssAbout, cssIndex, instanceCustomCSSPath},
 		Extra:       map[string]any{"showStrap": true},
 	}
 

internal/web/profile.go

@@ -132,7 +132,7 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 	}
 
 	// Prepare stylesheets for profile.
-	stylesheets := make([]string, 0, 6)
+	stylesheets := make([]string, 0, 7)
 
 	// Basic profile stylesheets.
 	stylesheets = append(
@@ -142,6 +142,7 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 			cssStatus,
 			cssThread,
 			cssProfile,
+			instanceCustomCSSPath,
 		}...,
 	)
 

internal/web/settings-panel.go

@@ -53,6 +53,7 @@ func (m *Module) SettingsPanelHandler(c *gin.Context) {
 			cssProfile, // Used for rendering stub/fake profiles.
 			cssStatus,  // Used for rendering stub/fake statuses.
 			cssSettings,
+			instanceCustomCSSPath,
 		},
 		Javascript: []string{jsSettings},
 	}

internal/web/signup.go

@@ -128,6 +128,7 @@ func (m *Module) signupPOSTHandler(c *gin.Context) {
 	page := apiutil.WebPage{
 		Template:    "signed-up.tmpl",
 		Instance:    instance,
+		Stylesheets: []string{instanceCustomCSSPath},
 		OGMeta:      apiutil.OGBase(instance),
 		Extra: map[string]any{
 			"email":    user.UnconfirmedEmail,

internal/web/tag.go

@@ -59,7 +59,7 @@ func (m *Module) tagGETHandler(c *gin.Context) {
 		Template:    "tag.tmpl",
 		Instance:    instance,
 		OGMeta:      apiutil.OGBase(instance),
-		Stylesheets: []string{cssFA, cssThread, cssTag},
+		Stylesheets: []string{cssFA, cssThread, cssTag, instanceCustomCSSPath},
 		Extra:       map[string]any{"tagName": tagName},
 	}
 

internal/web/thread.go

@@ -115,7 +115,7 @@ func (m *Module) threadGETHandler(c *gin.Context) {
 	}
 
 	// Prepare stylesheets for thread.
-	stylesheets := make([]string, 0, 5)
+	stylesheets := make([]string, 0, 6)
 
 	// Basic thread stylesheets.
 	stylesheets = append(
@@ -131,6 +131,7 @@ func (m *Module) threadGETHandler(c *gin.Context) {
 	if theme := targetAccount.Theme; theme != "" {
 		stylesheets = append(
 			stylesheets,
+			instanceCustomCSSPath,
 			themesPathPrefix+"/"+theme,
 		)
 	}

internal/web/web.go

@@ -41,6 +41,7 @@
 	statusPath            = "/statuses/:" + apiutil.WebStatusIDKey // leave out the '/@:username' prefix as this will be served within the profile group
 	tagsPath              = "/tags/:" + apiutil.TagNameKey
 	customCSSPath         = profileGroupPath + "/custom.css"
+	instanceCustomCSSPath = "/custom.css"
 	rssFeedPath           = profileGroupPath + "/feed.rss"
 	assetsPathPrefix      = "/assets"
 	distPathPrefix        = assetsPathPrefix + "/dist"
@@ -114,6 +115,7 @@ func (m *Module) Route(r *router.Router, mi ...gin.HandlerFunc) {
 	r.AttachHandler(http.MethodGet, settingsPathPrefix, m.SettingsPanelHandler)
 	r.AttachHandler(http.MethodGet, settingsPanelGlob, m.SettingsPanelHandler)
 	r.AttachHandler(http.MethodGet, customCSSPath, m.customCSSGETHandler)
+	r.AttachHandler(http.MethodGet, instanceCustomCSSPath, m.instanceCustomCSSGETHandler)
 	r.AttachHandler(http.MethodGet, rssFeedPath, m.rssFeedGETHandler)
 	r.AttachHandler(http.MethodGet, confirmEmailPath, m.confirmEmailGETHandler)
 	r.AttachHandler(http.MethodPost, confirmEmailPath, m.confirmEmailPOSTHandler)

web/source/settings/lib/types/instance.ts

@@ -25,6 +25,7 @@ export interface InstanceV1 {
     description_text?:       string;
     short_description:      string;
     short_description_text?: string;
+    custom_css:             string;
     email:                  string;
     version:                string;
     debug?:                 boolean;

web/source/settings/views/admin/instance/settings.tsx

@@ -66,6 +66,10 @@ function InstanceSettingsForm({ data: instance }: InstanceSettingsFormProps) {
 			valueSelector: (s: InstanceV1) => s.description_text,
 			validator: (val: string) => val.length <= descLimit ? "" : `Instance description is ${val.length} characters; must be ${descLimit} characters or less`
 		}),
+		customCSS: useTextInput("custom_css", {
+			source: instance,
+			valueSelector: (s: InstanceV1) => s.custom_css
+		}),
 		terms: useTextInput("terms", {
 			source: instance,
 			// Select "raw" text version of parsed field for editing.
@@ -191,6 +195,15 @@ function InstanceSettingsForm({ data: instance }: InstanceSettingsFormProps) {
 				type="email"
 			/>
 
+			<TextArea
+				field={form.customCSS}
+				label={"Custom CSS"}
+				className="monospace"
+				rows={8}
+				autoCapitalize="none"
+				spellCheck="false"
+			/>
+
 			<MutationButton label="Save" result={result} disabled={false} />
 		</form>
 	);