[feature] Advertise rich text formats, support content_type field (#1370)

* Advertise rich text formats, support content_type field

* Update JSON in instance patch tests

* Replace format with content_type everywhere

* update migration to work with both pg and sqlite

* regenerate swagger docs

* update instance serialization + tests

* fix up

* learn to code tobi please, i'm begging you

---------

Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>

docs/api/swagger.yaml

@@ -143,10 +143,10 @@ definitions:
                 description: Whether new statuses should be marked sensitive by default.
                 type: boolean
                 x-go-name: Sensitive
-            status_format:
+            status_content_type:
-                description: The default posting format for new statuses.
+                description: The default posting content type for new statuses.
                 type: string
-                x-go-name: StatusFormat
+                x-go-name: StatusContentType
         title: Source represents display or publishing preferences of user's own account.
         type: object
         x-go-package: github.com/superseriousbusiness/gotosocial/internal/api/model
@@ -1240,6 +1240,15 @@ definitions:
                 format: int64
                 type: integer
                 x-go-name: MaxMediaAttachments
+            supported_mime_types:
+                description: List of mime types that it's possible to use for statuses on this instance.
+                example:
+                    - text/plain
+                    - text/markdown
+                items:
+                    type: string
+                type: array
+                x-go-name: SupportedMimeTypes
         title: InstanceConfigurationStatuses models instance status config parameters.
         type: object
         x-go-name: InstanceConfigurationStatuses
@@ -2112,12 +2121,12 @@ definitions:
         x-go-package: github.com/superseriousbusiness/gotosocial/internal/api/model
     statusCreateRequest:
         properties:
-            format:
+            content_type:
                 description: |-
-                    Format to use when parsing this status.
+                    Content type to use when parsing this status.
                     in: formData
                 type: string
-                x-go-name: Format
+                x-go-name: ContentType
             in_reply_to_id:
                 description: |-
                     ID of the status being replied to, if status is a reply.
@@ -2463,10 +2472,10 @@ definitions:
                 description: Mark authored statuses as sensitive by default.
                 type: boolean
                 x-go-name: Sensitive
-            status_format:
+            status_content_type:
-                description: Default format for authored statuses (plain or markdown).
+                description: Default format for authored statuses (text/plain or text/markdown).
                 type: string
-                x-go-name: StatusFormat
+                x-go-name: StatusContentType
         title: UpdateSource is to be used specifically in an UpdateCredentialsRequest.
         type: object
         x-go-name: UpdateSource
@@ -3081,9 +3090,9 @@ paths:
                   in: formData
                   name: source[language]
                   type: string
-                - description: Default format to use for authored statuses (plain or markdown).
+                - description: Default content type to use for authored statuses (text/plain or text/markdown).
                   in: formData
-                  name: source[status_format]
+                  name: source[status_content_type]
                   type: string
                 - description: Custom CSS to use when rendering this account's profile or statuses. String must be no more than 5,000 characters (~5kb).
                   in: formData
@@ -4874,11 +4883,11 @@ paths:
                   name: language
                   type: string
                   x-go-name: Language
-                - description: Format to use when parsing this status.
+                - description: Content type to use when parsing this status.
                   in: formData
-                  name: format
+                  name: content_type
                   type: string
-                  x-go-name: Format
+                  x-go-name: ContentType
                 - description: This status will be federated beyond the local timeline(s).
                   in: query
                   name: federated

internal/api/client/accounts/accountupdate.go

@@ -99,9 +99,9 @@
 //		description: Default language to use for authored statuses (ISO 6391).
 //		type: string
 //	-
-//		name: source[status_format]
+//		name: source[status_content_type]
 //		in: formData
-//		description: Default format to use for authored statuses (plain or markdown).
+//		description: Default content type to use for authored statuses (text/plain or text/markdown).
 //		type: string
 //	-
 //		name: custom_css
@@ -190,8 +190,8 @@ func parseUpdateAccountForm(c *gin.Context) (*apimodel.UpdateCredentialsRequest,
 		form.Source.Language = &language
 	}
 
-	if statusFormat, ok := sourceMap["status_format"]; ok {
+	if statusContentType, ok := sourceMap["status_content_type"]; ok {
-		form.Source.StatusFormat = &statusFormat
+		form.Source.StatusContentType = &statusContentType
 	}
 
 	if form == nil ||
@@ -205,7 +205,7 @@ func parseUpdateAccountForm(c *gin.Context) (*apimodel.UpdateCredentialsRequest,
 			form.Source.Privacy == nil &&
 			form.Source.Sensitive == nil &&
 			form.Source.Language == nil &&
-			form.Source.StatusFormat == nil &&
+			form.Source.StatusContentType == nil &&
 			form.FieldsAttributes == nil &&
 			form.CustomCSS == nil &&
 			form.EnableRSS == nil) {

internal/api/client/accounts/accountupdate_test.go

@@ -414,13 +414,13 @@ func (suite *AccountUpdateTestSuite) TestAccountUpdateCredentialsPATCHHandlerUpd
 	suite.True(apimodelAccount.Locked)
 }
 
-func (suite *AccountUpdateTestSuite) TestAccountUpdateCredentialsPATCHHandlerUpdateStatusFormatOK() {
+func (suite *AccountUpdateTestSuite) TestAccountUpdateCredentialsPATCHHandlerUpdateStatusContentTypeOK() {
 	// set up the request
 	// we're updating the language of zork
 	requestBody, w, err := testrig.CreateMultipartFormData(
 		"", "",
 		map[string]string{
-			"source[status_format]": "markdown",
+			"source[status_content_type]": "text/markdown",
 		})
 	if err != nil {
 		panic(err)
@@ -450,22 +450,22 @@ func (suite *AccountUpdateTestSuite) TestAccountUpdateCredentialsPATCHHandlerUpd
 
 	// check the returned api model account
 	// fields should be updated
-	suite.Equal("markdown", apimodelAccount.Source.StatusFormat)
+	suite.Equal("text/markdown", apimodelAccount.Source.StatusContentType)
 
 	dbAccount, err := suite.db.GetAccountByID(context.Background(), suite.testAccounts["local_account_1"].ID)
 	if err != nil {
 		suite.FailNow(err.Error())
 	}
-	suite.Equal(dbAccount.StatusFormat, "markdown")
+	suite.Equal(dbAccount.StatusContentType, "text/markdown")
 }
 
-func (suite *AccountUpdateTestSuite) TestAccountUpdateCredentialsPATCHHandlerUpdateStatusFormatBad() {
+func (suite *AccountUpdateTestSuite) TestAccountUpdateCredentialsPATCHHandlerUpdateStatusContentTypeBad() {
 	// set up the request
 	// we're updating the language of zork
 	requestBody, w, err := testrig.CreateMultipartFormData(
 		"", "",
 		map[string]string{
-			"source[status_format]": "peepeepoopoo",
+			"source[status_content_type]": "peepeepoopoo",
 		})
 	if err != nil {
 		panic(err)
@@ -486,7 +486,7 @@ func (suite *AccountUpdateTestSuite) TestAccountUpdateCredentialsPATCHHandlerUpd
 	b, err := ioutil.ReadAll(result.Body)
 	suite.NoError(err)
 
-	suite.Equal(`{"error":"Bad Request: status format 'peepeepoopoo' was not recognized, valid options are 'plain', 'markdown'"}`, string(b))
+	suite.Equal(`{"error":"Bad Request: status content type 'peepeepoopoo' was not recognized, valid options are 'text/plain', 'text/markdown'"}`, string(b))
 }
 
 func TestAccountUpdateTestSuite(t *testing.T) {

internal/api/client/instance/instancepatch_test.go

@@ -90,7 +90,11 @@ func (suite *InstancePatchTestSuite) TestInstancePatch1() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [
@@ -188,7 +192,11 @@ func (suite *InstancePatchTestSuite) TestInstancePatch2() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [
@@ -286,7 +294,11 @@ func (suite *InstancePatchTestSuite) TestInstancePatch3() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [
@@ -435,7 +447,11 @@ func (suite *InstancePatchTestSuite) TestInstancePatch6() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [
@@ -554,7 +570,11 @@ func (suite *InstancePatchTestSuite) TestInstancePatch8() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [
@@ -689,7 +709,11 @@ func (suite *InstancePatchTestSuite) TestInstancePatch9() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [

internal/api/client/statuses/statuscreate_test.go

@@ -105,14 +105,14 @@ func (suite *StatusCreateTestSuite) TestPostNewStatus() {
 func (suite *StatusCreateTestSuite) TestPostNewStatusMarkdown() {
 	// set default post language of account 1 to markdown
 	testAccount := suite.testAccounts["local_account_1"]
-	testAccount.StatusFormat = "markdown"
+	testAccount.StatusContentType = "text/markdown"
 	a := testAccount
 
 	err := suite.db.UpdateAccount(context.Background(), a)
 	if err != nil {
 		suite.FailNow(err.Error())
 	}
-	suite.Equal(a.StatusFormat, "markdown")
+	suite.Equal(a.StatusContentType, "text/markdown")
 
 	t := suite.testTokens["local_account_1"]
 	oauthToken := oauth.DBTokenToToken(t)

internal/api/model/account.go

@@ -174,8 +174,8 @@ type UpdateSource struct {
 	Sensitive *bool `form:"sensitive" json:"sensitive" xml:"sensitive"`
 	// Default language to use for authored statuses. (ISO 6391)
 	Language *string `form:"language" json:"language" xml:"language"`
-	// Default format for authored statuses (plain or markdown).
+	// Default format for authored statuses (text/plain or text/markdown).
-	StatusFormat *string `form:"status_format" json:"status_format" xml:"status_format"`
+	StatusContentType *string `form:"status_content_type" json:"status_content_type" xml:"status_content_type"`
 }
 
 // UpdateField is to be used specifically in an UpdateCredentialsRequest.

internal/api/model/instance.go

@@ -73,6 +73,10 @@ type InstanceConfigurationStatuses struct {
 	//
 	// example: 25
 	CharactersReservedPerURL int `json:"characters_reserved_per_url"`
+	// List of mime types that it's possible to use for statuses on this instance.
+	//
+	// example: ["text/plain","text/markdown"]
+	SupportedMimeTypes []string `json:"supported_mime_types,omitempty"`
 }
 
 // InstanceConfigurationMediaAttachments models instance media attachment config parameters.

internal/api/model/source.go

@@ -31,8 +31,8 @@ type Source struct {
 	Sensitive bool `json:"sensitive"`
 	// The default posting language for new statuses.
 	Language string `json:"language"`
-	// The default posting format for new statuses.
+	// The default posting content type for new statuses.
-	StatusFormat string `json:"status_format"`
+	StatusContentType string `json:"status_content_type"`
 	// Profile bio.
 	Note string `json:"note"`
 	// Metadata about the account.

internal/api/model/status.go

@@ -179,9 +179,9 @@ type StatusCreateRequest struct {
 	// ISO 639 language code for this status.
 	// in: formData
 	Language string `form:"language" json:"language" xml:"language"`
-	// Format to use when parsing this status.
+	// Content type to use when parsing this status.
 	// in: formData
-	Format StatusFormat `form:"format" json:"format" xml:"format"`
+	ContentType StatusContentType `form:"content_type" json:"content_type" xml:"content_type"`
 }
 
 // Visibility models the visibility of a status.
@@ -227,16 +227,16 @@ type AdvancedVisibilityFlagsForm struct {
 	Likeable *bool `form:"likeable" json:"likeable" xml:"likeable"`
 }
 
-// StatusFormat is the format in which to parse the submitted status.
+// StatusContentType is the content type with which to parse the submitted status.
-// Can be either plain or markdown. Empty will default to plain.
+// Can be either text/plain or text/markdown. Empty will default to text/plain.
 //
-// swagger:enum statusFormat
+// swagger:enum statusContentType
 // swagger:type string
-type StatusFormat string
+type StatusContentType string
 
-// Format to use when parsing submitted status into an html-formatted status
+// Content type to use when parsing submitted status into an html-formatted status
 const (
-	StatusFormatPlain    StatusFormat = "plain"
+	StatusContentTypePlain    StatusContentType = "text/plain"
-	StatusFormatMarkdown StatusFormat = "markdown"
+	StatusContentTypeMarkdown StatusContentType = "text/markdown"
-	StatusFormatDefault  StatusFormat = StatusFormatPlain
+	StatusContentTypeDefault                    = StatusContentTypePlain
 )

internal/db/bundb/basic_test.go

@@ -89,7 +89,7 @@ func (suite *BasicTestSuite) TestPutAccountWithBunDefaultFields() {
 	suite.Empty(a.Privacy)
 	suite.False(*a.Sensitive)
 	suite.Equal("en", a.Language)
-	suite.Empty(a.StatusFormat)
+	suite.Empty(a.StatusContentType)
 	suite.Equal(testAccount.URI, a.URI)
 	suite.Equal(testAccount.URL, a.URL)
 	suite.Zero(testAccount.FetchedAt)

internal/db/bundb/migrations/20230126170719_format_to_content_type.go

@@ -0,0 +1,96 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
+
+   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"
+	"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 a new column for status_content_type.
+			if _, err := tx.ExecContext(ctx, "ALTER TABLE ? ADD COLUMN ? TEXT", bun.Ident("accounts"), bun.Ident("status_content_type")); err != nil &&
+				!(strings.Contains(err.Error(), "already exists") || strings.Contains(err.Error(), "duplicate column name") || strings.Contains(err.Error(), "SQLSTATE 42701")) {
+				return err
+			}
+
+			// Port values into this column from the old status_format column,
+			// prepending 'text/' to the value to derive the mime type.
+			//
+			// Eg, 'plain' status_format becomes 'text/plain' status_content_type.
+			q := tx.
+				NewUpdate().
+				Table("accounts").
+				Where("? IS NOT NULL", bun.Ident("status_format"))
+
+			// We need to switch here because Postgres and SQLite
+			// have different syntaxes for concatenation.
+			switch tx.Dialect().Name() {
+			case dialect.SQLite:
+				q = q.
+					Set("? = ? || ?", bun.Ident("status_content_type"), "text/", bun.Ident("status_format"))
+			case dialect.PG:
+				q = q.
+					Set("? = CONCAT(?, ?)", bun.Ident("status_content_type"), "text/", bun.Ident("status_format"))
+			default:
+				panic("db conn was neither pg not sqlite")
+			}
+
+			if _, err := q.Exec(ctx); err != nil {
+				return err
+			}
+
+			// Drop the old status_format column.
+			if _, err := tx.ExecContext(ctx, "ALTER TABLE ? DROP COLUMN ?", bun.Ident("accounts"), bun.Ident("status_format")); err != nil &&
+				!(strings.Contains(err.Error(), "no such column") || strings.Contains(err.Error(), "does not exist") || strings.Contains(err.Error(), "SQLSTATE 42703")) {
+				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 {
+			var err error
+			_, err = db.ExecContext(ctx, "ALTER TABLE ? ADD COLUMN ? TEXT", bun.Ident("accounts"), bun.Ident("status_format"))
+			if err != nil && !(strings.Contains(err.Error(), "already exists") || strings.Contains(err.Error(), "duplicate column name") || strings.Contains(err.Error(), "SQLSTATE 42701")) {
+				return err
+			}
+			_, err = db.ExecContext(ctx, "UPDATE ? SET ? = SUBSTR(?, 6) WHERE ? IS NOT NULL", bun.Ident("accounts"), bun.Ident("status_format"), bun.Ident("status_content_type"), bun.Ident("status_content_type"))
+			if err != nil {
+				return err
+			}
+			_, err = db.ExecContext(ctx, "ALTER TABLE ? DROP COLUMN ?", bun.Ident("accounts"), bun.Ident("status_content_type"))
+			if err != nil {
+				return err
+			}
+			return nil
+		})
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}

internal/gtsmodel/account.go

@@ -60,7 +60,7 @@ type Account struct {
 	Privacy                 Visibility       `validate:"required_without=Domain,omitempty,oneof=public unlocked followers_only mutuals_only direct" bun:",nullzero"` // Default post privacy for this account
 	Sensitive               *bool            `validate:"-" bun:",default:false"`                                                                                     // Set posts from this account to sensitive by default?
 	Language                string           `validate:"omitempty,bcp47_language_tag" bun:",nullzero,notnull,default:'en'"`                                          // What language does this account post in?
-	StatusFormat            string           `validate:"required_without=Domain,omitempty,oneof=plain markdown" bun:",nullzero"`                                     // What is the default format for statuses posted by this account (only for local accounts).
+	StatusContentType       string           `validate:"required_without=Domain,omitempty,oneof=text/plain text/markdown" bun:",nullzero"`                           // What is the default format for statuses posted by this account (only for local accounts).
 	CustomCSS               string           `validate:"-" bun:",nullzero"`                                                                                          // Custom CSS that should be displayed for this Account's profile and statuses.
 	URI                     string           `validate:"required,url" bun:",nullzero,notnull,unique"`                                                                // ActivityPub URI for this account.
 	URL                     string           `validate:"required_without=Domain,omitempty,url" bun:",nullzero,unique"`                                               // Web URL for this account's profile

internal/processing/account/update.go

@@ -79,7 +79,7 @@ func (p *Processor) Update(ctx context.Context, account *gtsmodel.Account, form
 
 		// Process note to generate a valid HTML representation
 		var f text.FormatFunc
-		if account.StatusFormat == "markdown" {
+		if account.StatusContentType == "text/markdown" {
 			f = p.formatter.FromMarkdown
 		} else {
 			f = p.formatter.FromPlain
@@ -144,12 +144,12 @@ func (p *Processor) Update(ctx context.Context, account *gtsmodel.Account, form
 			account.Privacy = privacy
 		}
 
-		if form.Source.StatusFormat != nil {
+		if form.Source.StatusContentType != nil {
-			if err := validate.StatusFormat(*form.Source.StatusFormat); err != nil {
+			if err := validate.StatusContentType(*form.Source.StatusContentType); err != nil {
 				return nil, gtserror.NewErrorBadRequest(err, err.Error())
 			}
 
-			account.StatusFormat = *form.Source.StatusFormat
+			account.StatusContentType = *form.Source.StatusContentType
 		}
 	}
 

internal/processing/account/update_test.go

@@ -122,13 +122,13 @@ func (suite *AccountUpdateTestSuite) TestAccountUpdateWithMarkdownNote() {
 		Note: &note,
 	}
 
-	// set default post language of account 1 to markdown
+	// set default post content type of account 1 to markdown
-	testAccount.StatusFormat = "markdown"
+	testAccount.StatusContentType = "text/markdown"
 
 	// should get no error from the update function, and an api model account returned
 	apiAccount, errWithCode := suite.accountProcessor.Update(context.Background(), testAccount, form)
 	// reset test account to avoid breaking other tests
-	testAccount.StatusFormat = "plain"
+	testAccount.StatusContentType = "text/plain"
 	suite.NoError(errWithCode)
 	suite.NotNil(apiAccount)
 

internal/processing/status/create.go

@@ -290,32 +290,32 @@ func processContent(ctx context.Context, dbService db.DB, formatter text.Formatt
 		return nil
 	}
 
-	// if format wasn't specified we should try to figure out what format this user prefers
+	// if content type wasn't specified we should try to figure out what content type this user prefers
-	if form.Format == "" {
+	if form.ContentType == "" {
 		acct, err := dbService.GetAccountByID(ctx, accountID)
 		if err != nil {
 			return fmt.Errorf("error processing new content: couldn't retrieve account from db to check post format: %s", err)
 		}
 
-		switch acct.StatusFormat {
+		switch acct.StatusContentType {
-		case "plain":
+		case "text/plain":
-			form.Format = apimodel.StatusFormatPlain
+			form.ContentType = apimodel.StatusContentTypePlain
-		case "markdown":
+		case "text/markdown":
-			form.Format = apimodel.StatusFormatMarkdown
+			form.ContentType = apimodel.StatusContentTypeMarkdown
 		default:
-			form.Format = apimodel.StatusFormatDefault
+			form.ContentType = apimodel.StatusContentTypeDefault
 		}
 	}
 
-	// parse content out of the status depending on what format has been submitted
+	// parse content out of the status depending on what content type has been submitted
 	var f text.FormatFunc
-	switch form.Format {
+	switch form.ContentType {
-	case apimodel.StatusFormatPlain:
+	case apimodel.StatusContentTypePlain:
 		f = formatter.FromPlain
-	case apimodel.StatusFormatMarkdown:
+	case apimodel.StatusContentTypeMarkdown:
 		f = formatter.FromMarkdown
 	default:
-		return fmt.Errorf("format %s not recognised as a valid status format", form.Format)
+		return fmt.Errorf("format %s not recognised as a valid status format", form.ContentType)
 	}
 	formatted := f(ctx, parseMention, accountID, status.ID, form.Status)
 

internal/processing/status/create_test.go

@@ -50,7 +50,7 @@ func (suite *StatusCreateTestSuite) TestProcessContentWarningWithQuotationMarks(
 			Visibility:  apimodel.VisibilityPublic,
 			ScheduledAt: "",
 			Language:    "en",
-			Format:      apimodel.StatusFormatPlain,
+			ContentType: apimodel.StatusContentTypePlain,
 		},
 		AdvancedVisibilityFlagsForm: apimodel.AdvancedVisibilityFlagsForm{
 			Federated: nil,
@@ -84,7 +84,7 @@ func (suite *StatusCreateTestSuite) TestProcessContentWarningWithHTMLEscapedQuot
 			Visibility:  apimodel.VisibilityPublic,
 			ScheduledAt: "",
 			Language:    "en",
-			Format:      apimodel.StatusFormatPlain,
+			ContentType: apimodel.StatusContentTypePlain,
 		},
 		AdvancedVisibilityFlagsForm: apimodel.AdvancedVisibilityFlagsForm{
 			Federated: nil,
@@ -122,7 +122,7 @@ func (suite *StatusCreateTestSuite) TestProcessStatusMarkdownWithUnderscoreEmoji
 			Visibility:  apimodel.VisibilityPublic,
 			ScheduledAt: "",
 			Language:    "en",
-			Format:      apimodel.StatusFormatMarkdown,
+			ContentType: apimodel.StatusContentTypeMarkdown,
 		},
 		AdvancedVisibilityFlagsForm: apimodel.AdvancedVisibilityFlagsForm{
 			Federated: nil,
@@ -156,7 +156,7 @@ func (suite *StatusCreateTestSuite) TestProcessStatusMarkdownWithSpoilerTextEmoj
 			Visibility:  apimodel.VisibilityPublic,
 			ScheduledAt: "",
 			Language:    "en",
-			Format:      apimodel.StatusFormatMarkdown,
+			ContentType: apimodel.StatusContentTypeMarkdown,
 		},
 		AdvancedVisibilityFlagsForm: apimodel.AdvancedVisibilityFlagsForm{
 			Federated: nil,
@@ -194,7 +194,7 @@ func (suite *StatusCreateTestSuite) TestProcessMediaDescriptionTooShort() {
 			Visibility:  apimodel.VisibilityPublic,
 			ScheduledAt: "",
 			Language:    "en",
-			Format:      apimodel.StatusFormatPlain,
+			ContentType: apimodel.StatusContentTypePlain,
 		},
 		AdvancedVisibilityFlagsForm: apimodel.AdvancedVisibilityFlagsForm{
 			Federated: nil,

internal/trans/import_test.go

@@ -111,7 +111,7 @@ func (suite *ImportMinimalTestSuite) TestImportMinimalOK() {
 	suite.Equal(testAccountBefore.Privacy, testAccountAfter.Privacy)
 	suite.Equal(testAccountBefore.Sensitive, testAccountAfter.Sensitive)
 	suite.Equal(testAccountBefore.Language, testAccountAfter.Language)
-	suite.Equal(testAccountBefore.StatusFormat, testAccountAfter.StatusFormat)
+	suite.Equal(testAccountBefore.StatusContentType, testAccountAfter.StatusContentType)
 	suite.Equal(testAccountBefore.URI, testAccountAfter.URI)
 	suite.Equal(testAccountBefore.URL, testAccountAfter.URL)
 	suite.Equal(testAccountBefore.InboxURI, testAccountAfter.InboxURI)

internal/trans/model/account.go

@@ -43,7 +43,7 @@ type Account struct {
 	Privacy               string          `json:"privacy,omitempty" bun:",nullzero"`
 	Sensitive             *bool           `json:"sensitive"`
 	Language              string          `json:"language,omitempty" bun:",nullzero"`
-	StatusFormat          string          `json:"statusFormat,omitempty" bun:",nullzero"`
+	StatusContentType     string          `json:"statusContentType,omitempty" bun:",nullzero"`
 	URI                   string          `json:"uri" bun:",nullzero"`
 	URL                   string          `json:"url" bun:",nullzero"`
 	InboxURI              string          `json:"inboxURI" bun:",nullzero"`

internal/typeutils/internaltofrontend.go

@@ -46,6 +46,11 @@
 	instanceSourceURL                           = "https://github.com/superseriousbusiness/gotosocial"
 )
 
+var instanceStatusesSupportedMimeTypes = []string{
+	string(apimodel.StatusContentTypePlain),
+	string(apimodel.StatusContentTypeMarkdown),
+}
+
 func (c *converter) AccountToAPIAccountSensitive(ctx context.Context, a *gtsmodel.Account) (*apimodel.Account, error) {
 	// we can build this sensitive account easily by first getting the public account....
 	apiAccount, err := c.AccountToAPIAccountPublic(ctx, a)
@@ -67,16 +72,16 @@ func (c *converter) AccountToAPIAccountSensitive(ctx context.Context, a *gtsmode
 		frc = len(frs)
 	}
 
-	statusFormat := string(apimodel.StatusFormatDefault)
+	statusContentType := string(apimodel.StatusContentTypeDefault)
-	if a.StatusFormat != "" {
+	if a.StatusContentType != "" {
-		statusFormat = a.StatusFormat
+		statusContentType = a.StatusContentType
 	}
 
 	apiAccount.Source = &apimodel.Source{
 		Privacy:             c.VisToAPIVis(ctx, a.Privacy),
 		Sensitive:           *a.Sensitive,
 		Language:            a.Language,
-		StatusFormat:        statusFormat,
+		StatusContentType:   statusContentType,
 		Note:                a.NoteRaw,
 		Fields:              apiAccount.Fields,
 		FollowRequestsCount: frc,
@@ -695,6 +700,7 @@ func (c *converter) InstanceToAPIV1Instance(ctx context.Context, i *gtsmodel.Ins
 	instance.Configuration.Statuses.MaxCharacters = config.GetStatusesMaxChars()
 	instance.Configuration.Statuses.MaxMediaAttachments = config.GetStatusesMediaMaxFiles()
 	instance.Configuration.Statuses.CharactersReservedPerURL = instanceStatusesCharactersReservedPerURL
+	instance.Configuration.Statuses.SupportedMimeTypes = instanceStatusesSupportedMimeTypes
 	instance.Configuration.MediaAttachments.SupportedMimeTypes = media.SupportedMIMETypes
 	instance.Configuration.MediaAttachments.ImageSizeLimit = int(config.GetMediaImageMaxSize())
 	instance.Configuration.MediaAttachments.ImageMatrixLimit = instanceMediaAttachmentsImageMatrixLimit
@@ -820,6 +826,7 @@ func (c *converter) InstanceToAPIV2Instance(ctx context.Context, i *gtsmodel.Ins
 	instance.Configuration.Statuses.MaxCharacters = config.GetStatusesMaxChars()
 	instance.Configuration.Statuses.MaxMediaAttachments = config.GetStatusesMediaMaxFiles()
 	instance.Configuration.Statuses.CharactersReservedPerURL = instanceStatusesCharactersReservedPerURL
+	instance.Configuration.Statuses.SupportedMimeTypes = instanceStatusesSupportedMimeTypes
 	instance.Configuration.MediaAttachments.SupportedMimeTypes = media.SupportedMIMETypes
 	instance.Configuration.MediaAttachments.ImageSizeLimit = int(config.GetMediaImageMaxSize())
 	instance.Configuration.MediaAttachments.ImageMatrixLimit = instanceMediaAttachmentsImageMatrixLimit

internal/typeutils/internaltofrontend_test.go

@@ -198,7 +198,7 @@ func (suite *InternalToFrontendTestSuite) TestAccountToFrontendSensitive() {
     "privacy": "public",
     "sensitive": false,
     "language": "en",
-    "status_format": "plain",
+    "status_content_type": "text/plain",
     "note": "hey yo this is my profile!",
     "fields": [],
     "follow_requests_count": 0
@@ -504,7 +504,11 @@ func (suite *InternalToFrontendTestSuite) TestInstanceV1ToFrontend() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [
@@ -616,7 +620,11 @@ func (suite *InternalToFrontendTestSuite) TestInstanceV2ToFrontend() {
     "statuses": {
       "max_characters": 5000,
       "max_media_attachments": 6,
-      "characters_reserved_per_url": 25
+      "characters_reserved_per_url": 25,
+      "supported_mime_types": [
+        "text/plain",
+        "text/markdown"
+      ]
     },
     "media_attachments": {
       "supported_mime_types": [

internal/validate/account_test.go

@@ -63,7 +63,7 @@ func happyAccount() *gtsmodel.Account {
 		Privacy:                 gtsmodel.VisibilityPublic,
 		Sensitive:               testrig.FalseBool(),
 		Language:                "en",
-		StatusFormat:            "plain",
+		StatusContentType:       "text/plain",
 		URI:                     "http://localhost:8080/users/the_mighty_zork",
 		URL:                     "http://localhost:8080/@the_mighty_zork",
 		FetchedAt:               time.Time{},

internal/validate/formvalidation.go

@@ -150,16 +150,16 @@ func Privacy(privacy string) error {
 	return fmt.Errorf("privacy '%s' was not recognized, valid options are 'direct', 'mutuals_only', 'private', 'public', 'unlisted'", privacy)
 }
 
-// StatusFormat checks that the desired status format setting is valid.
+// StatusContentType checks that the desired status format setting is valid.
-func StatusFormat(statusFormat string) error {
+func StatusContentType(statusContentType string) error {
-	if statusFormat == "" {
+	if statusContentType == "" {
 		return fmt.Errorf("empty string for status format not allowed")
 	}
-	switch apimodel.StatusFormat(statusFormat) {
+	switch apimodel.StatusContentType(statusContentType) {
-	case apimodel.StatusFormatPlain, apimodel.StatusFormatMarkdown:
+	case apimodel.StatusContentTypePlain, apimodel.StatusContentTypeMarkdown:
 		return nil
 	}
-	return fmt.Errorf("status format '%s' was not recognized, valid options are 'plain', 'markdown'", statusFormat)
+	return fmt.Errorf("status content type '%s' was not recognized, valid options are 'text/plain', 'text/markdown'", statusContentType)
 }
 
 func CustomCSS(customCSS string) error {

web/source/settings/user/settings.js

@@ -53,14 +53,14 @@ function UserSettingsForm({ data }) {
 		- string source[privacy]
 		- bool source[sensitive]
 		- string source[language]
-		- string source[status_format]
+		- string source[status_content_type]
 	 */
 
 	const form = {
 		defaultPrivacy: useTextInput("source[privacy]", { source: data, defaultValue: "unlisted" }),
 		isSensitive: useBoolInput("source[sensitive]", { source: data }),
 		language: useTextInput("source[language]", { source: data, valueSelector: (s) => s.source.language?.toUpperCase() ?? "EN" }),
-		format: useTextInput("source[status_format]", { source: data, defaultValue: "plain" }),
+		statusContentType: useTextInput("source[status_content_type]", { source: data, defaultValue: "text/plain" }),
 	};
 
 	const [submitForm, result] = useFormSubmit(form, query.useUpdateCredentialsMutation());
@@ -82,10 +82,10 @@ function UserSettingsForm({ data }) {
 				}>
 					<a href="https://docs.gotosocial.org/en/latest/user_guide/posts/#privacy-settings" target="_blank" className="moreinfolink" rel="noreferrer">Learn more about post privacy settings (opens in a new tab)</a>
 				</Select>
-				<Select field={form.format} label="Default post (and bio) format" options={
+				<Select field={form.statusContentType} label="Default post (and bio) format" options={
 					<>
-						<option value="plain">Plain (default)</option>
+						<option value="text/plain">Plain (default)</option>
-						<option value="markdown">Markdown</option>
+						<option value="text/markdown">Markdown</option>
 					</>
 				}>
 					<a href="https://docs.gotosocial.org/en/latest/user_guide/posts/#input-types" target="_blank" className="moreinfolink" rel="noreferrer">Learn more about post format settings (opens in a new tab)</a>