[feature] Allow exposing allows, implement `/api/v1/domain_blocks` and `/api/v1/domain_allows` (#4169)

- adds config flags `instance-expose-allowlist` and `instance-expose-allowlist-web` to allow instance admins to expose their allowlist via the web + api.
- renames `instance-expose-suspended` and `instance-expose-suspended-web` to  `instance-expose-blocklist` and `instance-expose-blocklist-web`.
- deprecates the `suspended` filter on `/api/v1/instance/peers` endpoint and adds `blocked` and `allowed` filters
- adds the `flat` query param to `/api/v1/instance/peers` to allow forcing return of a flat list of domains
- implements `/api/v1/instance/domain_blocks` and `/api/v1/instance/domain_allows` endpoints with or without auth depending on config
- rejigs the instance about page to include a general section on domain permissions, with block and allow subsections (and appropriate links)

Closes https://codeberg.org/superseriousbusiness/gotosocial/issues/3847
Closes https://codeberg.org/superseriousbusiness/gotosocial/issues/4150

Prerequisite to https://codeberg.org/superseriousbusiness/gotosocial/issues/3711

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4169
Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Co-committed-by: tobi <tobi.smethurst@protonmail.com>

5 files changed, 336 insertions, 41 deletions

diff --git a/internal/api/client/instance/domainperms.go b/internal/api/client/instance/domainperms.go
new file mode 100644
index 000000000..6503388a5
--- /dev/null
+++ b/internal/api/client/instance/domainperms.go
@@ -0,0 +1,172 @@
+// 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 instance
+
+import (
+	"errors"
+	"net/http"
+
+	apiutil "code.superseriousbusiness.org/gotosocial/internal/api/util"
+	"code.superseriousbusiness.org/gotosocial/internal/config"
+	"code.superseriousbusiness.org/gotosocial/internal/gtserror"
+	"github.com/gin-gonic/gin"
+)
+
+// InstanceDomainBlocksGETHandler swagger:operation GET /api/v1/instance/domain_blocks instanceDomainBlocksGet
+//
+// List blocked domains.
+//
+// OAuth token may need to be provided depending on setting `instance-expose-blocklist`.
+//
+//	---
+//	tags:
+//	- instance
+//
+//	produces:
+//	- application/json
+//
+//	security:
+//	- OAuth2 Bearer: []
+//
+//	responses:
+//		'200':
+//			description: List of blocked domains.
+//			schema:
+//				type: array
+//				items:
+//					"$ref": "#/definitions/domain"
+//		'400':
+//			description: bad request
+//		'401':
+//			description: unauthorized
+//		'403':
+//			description: forbidden
+//		'404':
+//			description: not found
+//		'406':
+//			description: not acceptable
+//		'500':
+//			description: internal server error
+func (m *Module) InstanceDomainBlocksGETHandler(c *gin.Context) {
+	authed, errWithCode := apiutil.TokenAuth(c,
+		false, false, false, false,
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	if _, err := apiutil.NegotiateAccept(c, apiutil.JSONAcceptHeaders...); err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	if (authed.Account == nil || authed.User == nil) && !config.GetInstanceExposeBlocklist() {
+		const errText = "domain blocks endpoint requires an authenticated account/user"
+		errWithCode := gtserror.NewErrorUnauthorized(errors.New(errText), errText)
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	data, errWithCode := m.processor.InstancePeersGet(
+		c.Request.Context(),
+		true,  // Include blocked.
+		false, // Don't include allowed.
+		false, // Don't include open.
+		false, // Don't flatten.
+		true,  // Include severity.
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	apiutil.JSON(c, http.StatusOK, data)
+}
+
+// InstanceDomainAllowsGETHandler swagger:operation GET /api/v1/instance/domain_allows instanceDomainAllowsGet
+//
+// List explicitly allowed domains.
+//
+// OAuth token may need to be provided depending on setting `instance-expose-allowlist`.
+//
+//	---
+//	tags:
+//	- instance
+//
+//	produces:
+//	- application/json
+//
+//	security:
+//	- OAuth2 Bearer: []
+//
+//	responses:
+//		'200':
+//			description: List of explicitly allowed domains.
+//			schema:
+//				type: array
+//				items:
+//					"$ref": "#/definitions/domain"
+//		'400':
+//			description: bad request
+//		'401':
+//			description: unauthorized
+//		'403':
+//			description: forbidden
+//		'404':
+//			description: not found
+//		'406':
+//			description: not acceptable
+//		'500':
+//			description: internal server error
+func (m *Module) InstanceDomainAllowsGETHandler(c *gin.Context) {
+	authed, errWithCode := apiutil.TokenAuth(c,
+		false, false, false, false,
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	if _, err := apiutil.NegotiateAccept(c, apiutil.JSONAcceptHeaders...); err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	if (authed.Account == nil || authed.User == nil) && !config.GetInstanceExposeAllowlist() {
+		const errText = "domain allows endpoint requires an authenticated account/user"
+		errWithCode := gtserror.NewErrorUnauthorized(errors.New(errText), errText)
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	data, errWithCode := m.processor.InstancePeersGet(
+		c.Request.Context(),
+		false, // Don't include blocked.
+		true,  // Include allowed.
+		false, // Don't include open.
+		false, // Don't flatten.
+		false, // Don't include severity.
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	apiutil.JSON(c, http.StatusOK, data)
+}
diff --git a/internal/api/client/instance/instance.go b/internal/api/client/instance/instance.go
index cd6c438c8..0e06941cc 100644
--- a/internal/api/client/instance/instance.go
+++ b/internal/api/client/instance/instance.go
@@ -29,7 +29,10 @@ const (
 	InstanceInformationPathV2 = "/v2/instance"
 	InstancePeersPath         = InstanceInformationPathV1 + "/peers"
 	InstanceRulesPath         = InstanceInformationPathV1 + "/rules"
+	InstanceBlocklistPath     = InstanceInformationPathV1 + "/domain_blocks"
+	InstanceAllowlistPath     = InstanceInformationPathV1 + "/domain_allows"
 	PeersFilterKey            = "filter" // PeersFilterKey is used to provide filters to /api/v1/instance/peers
+	PeersFlatKey              = "flat"   // PeersFlatKey is used to set "flat=true" in /api/v1/instance/peers
 )
 
 type Module struct {
@@ -45,9 +48,9 @@ func New(processor *processing.Processor) *Module {
 func (m *Module) Route(attachHandler func(method string, path string, f ...gin.HandlerFunc) gin.IRoutes) {
 	attachHandler(http.MethodGet, InstanceInformationPathV1, m.InstanceInformationGETHandlerV1)
 	attachHandler(http.MethodGet, InstanceInformationPathV2, m.InstanceInformationGETHandlerV2)
-
 	attachHandler(http.MethodPatch, InstanceInformationPathV1, m.InstanceUpdatePATCHHandler)
 	attachHandler(http.MethodGet, InstancePeersPath, m.InstancePeersGETHandler)
-
 	attachHandler(http.MethodGet, InstanceRulesPath, m.InstanceRulesGETHandler)
+	attachHandler(http.MethodGet, InstanceBlocklistPath, m.InstanceDomainBlocksGETHandler)
+	attachHandler(http.MethodGet, InstanceAllowlistPath, m.InstanceDomainAllowsGETHandler)
 }
diff --git a/internal/api/client/instance/instancepeersget.go b/internal/api/client/instance/instancepeersget.go
index 7afeb7104..d9f7610b7 100644
--- a/internal/api/client/instance/instancepeersget.go
+++ b/internal/api/client/instance/instancepeersget.go
@@ -18,8 +18,10 @@
 package instance
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
+	"strconv"
 	"strings"
 
 	apiutil "code.superseriousbusiness.org/gotosocial/internal/api/util"
@@ -31,6 +33,8 @@ import (
 
 // InstancePeersGETHandler swagger:operation GET /api/v1/instance/peers instancePeersGet
 //
+// List peer domains.
+//
 //	---
 //	tags:
 //	- instance
@@ -44,19 +48,32 @@ import (
 //		type: string
 //		description: |-
 //			Comma-separated list of filters to apply to results. Recognized filters are:
-//				- `open` -- include peers that are not suspended or silenced
-//				- `suspended` -- include peers that have been suspended.
+//				- `open` -- include known domains that are not in the domain blocklist
+//				- `allowed` -- include domains that are in the domain allowlist
+//				- `blocked` -- include domains that are in the domain blocklist
+//				- `suspended` -- DEPRECATED! Use `blocked` instead. Same as `blocked`: include domains that are in the domain blocklist;
+//
+//			If filter is `open`, only domains that aren't in the blocklist will be shown.
 //
-//			If filter is `open`, only instances that haven't been suspended or silenced will be returned.
+//			If filter is `blocked`, only domains that *are* in the blocklist will be shown.
 //
-//			If filter is `suspended`, only suspended instances will be shown.
+//			If filter is `allowed`, only domains that are in the allowlist will be shown.
 //
-//			If filter is `open,suspended`, then all known instances will be returned.
+//			If filter is `open,blocked`, then blocked domains and known domains not on the blocklist will be shown.
+//
+//			If filter is `open,allowed`, then allowed domains and known domains not on the blocklist will be shown.
 //
 //			If filter is an empty string or not set, then `open` will be assumed as the default.
 //		in: query
 //		required: false
-//		default: "open"
+//		default: flat
+//	-
+//		name: flat
+//		type: boolean
+//		description: If true, a "flat" array of strings will be returned corresponding to just domain names.
+//		in: query
+//		required: false
+//		default: false
 //
 //	security:
 //	- OAuth2 Bearer: []
@@ -67,12 +84,10 @@ import (
 //				If no filter parameter is provided, or filter is empty, then a legacy,
 //				Mastodon-API compatible response will be returned. This will consist of
 //				just a 'flat' array of strings like `["example.com", "example.org"]`,
-//				which corresponds to domains this instance peers with.
-//
-//
-//				If a filter parameter is provided, then an array of objects with at least
-//				a `domain` key set on each object will be returned.
+//				which corresponds to setting a filter of `open` and flat=true.
 //
+//				If a filter parameter is provided and flat is not true, then an array
+//				of objects with at least a `domain` key set on each object will be returned.
 //
 //				Domains that are silenced or suspended will also have a key
 //				`suspended_at` or `silenced_at` that contains an iso8601 date string.
@@ -81,7 +96,6 @@ import (
 //				will have some letters replaced by `*` to make it more difficult for
 //				bad actors to target instances with harassment.
 //
-//
 //				Whether a flat response or a more detailed response is returned, domains
 //				will be sorted alphabetically by hostname.
 //			schema:
@@ -116,45 +130,85 @@ func (m *Module) InstancePeersGETHandler(c *gin.Context) {
 		return
 	}
 
-	var includeSuspended bool
-	var includeOpen bool
-	var flat bool
+	var (
+		includeBlocked bool
+		includeAllowed bool
+		includeOpen    bool
+		flatten        bool
+	)
+
 	if filterParam := c.Query(PeersFilterKey); filterParam != "" {
 		filters := strings.Split(filterParam, ",")
 		for _, f := range filters {
 			trimmed := strings.TrimSpace(f)
 			switch {
-			case strings.EqualFold(trimmed, "suspended"):
-				includeSuspended = true
+			case strings.EqualFold(trimmed, "blocked") || strings.EqualFold(trimmed, "suspended"):
+				includeBlocked = true
+			case strings.EqualFold(trimmed, "allowed"):
+				includeAllowed = true
 			case strings.EqualFold(trimmed, "open"):
 				includeOpen = true
 			default:
-				err := fmt.Errorf("filter %s not recognized; accepted values are 'open', 'suspended'", trimmed)
+				err := fmt.Errorf("filter %s not recognized; accepted values are 'open', 'blocked', 'allowed', and 'suspended' (deprecated)", trimmed)
 				apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
 				return
 			}
 		}
 	} else {
-		// default is to only include open domains, and present
+		// Default is to only include open domains, and present
 		// them in a 'flat' manner (just an array of strings),
-		// to maintain compatibility with mastodon API
+		// to maintain compatibility with the Mastodon API.
 		includeOpen = true
-		flat = true
+		flatten = true
 	}
 
-	if includeOpen && !config.GetInstanceExposePeers() && isUnauthenticated {
-		err := fmt.Errorf("peers open query requires an authenticated account/user")
-		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGetV1)
+	if includeBlocked && isUnauthenticated && !config.GetInstanceExposeBlocklist() {
+		const errText = "peers blocked query requires an authenticated account/user"
+		errWithCode := gtserror.NewErrorUnauthorized(errors.New(errText), errText)
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
 	}
 
-	if includeSuspended && !config.GetInstanceExposeSuspended() && isUnauthenticated {
-		err := fmt.Errorf("peers suspended query requires an authenticated account/user")
-		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGetV1)
+	if includeAllowed && isUnauthenticated && !config.GetInstanceExposeAllowlist() {
+		const errText = "peers allowed query requires an authenticated account/user"
+		errWithCode := gtserror.NewErrorUnauthorized(errors.New(errText), errText)
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
 	}
 
-	data, errWithCode := m.processor.InstancePeersGet(c.Request.Context(), includeSuspended, includeOpen, flat)
+	if includeOpen && isUnauthenticated && !config.GetInstanceExposePeers() {
+		const errText = "peers open query requires an authenticated account/user"
+		errWithCode := gtserror.NewErrorUnauthorized(errors.New(errText), errText)
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	if includeBlocked && includeAllowed {
+		const errText = "cannot include blocked + allowed filters at the same time"
+		errWithCode := gtserror.NewErrorBadRequest(errors.New(errText), errText)
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	if flatStr := c.Query(PeersFlatKey); flatStr != "" {
+		var err error
+		flatten, err = strconv.ParseBool(flatStr)
+		if err != nil {
+			err := fmt.Errorf("error parsing 'flat' key as boolean: %w", err)
+			errWithCode := gtserror.NewErrorBadRequest(err, err.Error())
+			apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+			return
+		}
+	}
+
+	data, errWithCode := m.processor.InstancePeersGet(
+		c.Request.Context(),
+		includeBlocked,
+		includeAllowed,
+		includeOpen,
+		flatten,
+		false, // Don't include severity.
+	)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
diff --git a/internal/api/client/instance/instancepeersget_test.go b/internal/api/client/instance/instancepeersget_test.go
index a18e30875..3c7f1f665 100644
--- a/internal/api/client/instance/instancepeersget_test.go
+++ b/internal/api/client/instance/instancepeersget_test.go
@@ -136,13 +136,14 @@ func (suite *InstancePeersGetTestSuite) TestInstancePeersGetOnlySuspended() {
   {
     "domain": "replyguys.com",
     "suspended_at": "2020-05-13T13:29:12.000Z",
-    "comment": "reply-guying to tech posts"
+    "comment": "reply-guying to tech posts",
+    "severity": "suspend"
   }
 ]`, dst.String())
 }
 
 func (suite *InstancePeersGetTestSuite) TestInstancePeersGetOnlySuspendedUnauthorized() {
-	config.SetInstanceExposeSuspended(false)
+	config.SetInstanceExposeBlocklist(false)
 
 	recorder := httptest.NewRecorder()
 	baseURI := fmt.Sprintf("%s://%s", config.GetProtocol(), config.GetHost())
@@ -159,11 +160,11 @@ func (suite *InstancePeersGetTestSuite) TestInstancePeersGetOnlySuspendedUnautho
 	b, err := io.ReadAll(result.Body)
 	suite.NoError(err)
 
-	suite.Equal(`{"error":"Unauthorized: peers suspended query requires an authenticated account/user"}`, string(b))
+	suite.Equal(`{"error":"Unauthorized: peers blocked query requires an authenticated account/user"}`, string(b))
 }
 
 func (suite *InstancePeersGetTestSuite) TestInstancePeersGetOnlySuspendedAuthorized() {
-	config.SetInstanceExposeSuspended(false)
+	config.SetInstanceExposeBlocklist(false)
 
 	recorder := httptest.NewRecorder()
 	baseURI := fmt.Sprintf("%s://%s", config.GetProtocol(), config.GetHost())
@@ -186,7 +187,8 @@ func (suite *InstancePeersGetTestSuite) TestInstancePeersGetOnlySuspendedAuthori
   {
     "domain": "replyguys.com",
     "suspended_at": "2020-05-13T13:29:12.000Z",
-    "comment": "reply-guying to tech posts"
+    "comment": "reply-guying to tech posts",
+    "severity": "suspend"
   }
 ]`, dst.String())
 }
@@ -219,11 +221,33 @@ func (suite *InstancePeersGetTestSuite) TestInstancePeersGetAll() {
   {
     "domain": "replyguys.com",
     "suspended_at": "2020-05-13T13:29:12.000Z",
-    "comment": "reply-guying to tech posts"
+    "comment": "reply-guying to tech posts",
+    "severity": "suspend"
   }
 ]`, dst.String())
 }
 
+func (suite *InstancePeersGetTestSuite) TestInstancePeersGetAllowed() {
+	recorder := httptest.NewRecorder()
+	baseURI := fmt.Sprintf("%s://%s", config.GetProtocol(), config.GetHost())
+	requestURI := fmt.Sprintf("%s/%s?filter=allowed", baseURI, instance.InstancePeersPath)
+	ctx := suite.newContext(recorder, http.MethodGet, requestURI, nil, "", false)
+
+	suite.instanceModule.InstancePeersGETHandler(ctx)
+
+	suite.Equal(http.StatusOK, recorder.Code)
+
+	result := recorder.Result()
+	defer result.Body.Close()
+
+	b, err := io.ReadAll(result.Body)
+	suite.NoError(err)
+	dst := new(bytes.Buffer)
+	err = json.Indent(dst, b, "", "  ")
+	suite.NoError(err)
+	suite.Equal(`[]`, dst.String())
+}
+
 func (suite *InstancePeersGetTestSuite) TestInstancePeersGetAllWithObfuscated() {
 	err := suite.db.Put(context.Background(), &gtsmodel.DomainBlock{
 		ID:                 "01G633XTNK51GBADQZFZQDP6WR",
@@ -263,16 +287,55 @@ func (suite *InstancePeersGetTestSuite) TestInstancePeersGetAllWithObfuscated()
   {
     "domain": "o*g.*u**.t**.*or*t.*r**ev**",
     "suspended_at": "2021-06-09T10:34:55.000Z",
-    "comment": "just absolutely the worst, wowza"
+    "comment": "just absolutely the worst, wowza",
+    "severity": "suspend"
   },
   {
     "domain": "replyguys.com",
     "suspended_at": "2020-05-13T13:29:12.000Z",
-    "comment": "reply-guying to tech posts"
+    "comment": "reply-guying to tech posts",
+    "severity": "suspend"
   }
 ]`, dst.String())
 }
 
+func (suite *InstancePeersGetTestSuite) TestInstancePeersGetAllWithObfuscatedFlat() {
+	err := suite.db.Put(context.Background(), &gtsmodel.DomainBlock{
+		ID:                 "01G633XTNK51GBADQZFZQDP6WR",
+		CreatedAt:          testrig.TimeMustParse("2021-06-09T12:34:55+02:00"),
+		UpdatedAt:          testrig.TimeMustParse("2021-06-09T12:34:55+02:00"),
+		Domain:             "omg.just.the.worst.org.ever",
+		CreatedByAccountID: "01F8MH17FWEB39HZJ76B6VXSKF",
+		PublicComment:      "just absolutely the worst, wowza",
+		Obfuscate:          util.Ptr(true),
+	})
+	suite.NoError(err)
+
+	recorder := httptest.NewRecorder()
+	baseURI := fmt.Sprintf("%s://%s", config.GetProtocol(), config.GetHost())
+	requestURI := fmt.Sprintf("%s/%s?filter=suspended,open&flat=true", baseURI, instance.InstancePeersPath)
+	ctx := suite.newContext(recorder, http.MethodGet, requestURI, nil, "", false)
+
+	suite.instanceModule.InstancePeersGETHandler(ctx)
+
+	suite.Equal(http.StatusOK, recorder.Code)
+
+	result := recorder.Result()
+	defer result.Body.Close()
+
+	b, err := io.ReadAll(result.Body)
+	suite.NoError(err)
+	dst := new(bytes.Buffer)
+	err = json.Indent(dst, b, "", "  ")
+	suite.NoError(err)
+	suite.Equal(`[
+  "example.org",
+  "fossbros-anonymous.io",
+  "o*g.*u**.t**.*or*t.*r**ev**",
+  "replyguys.com"
+]`, dst.String())
+}
+
 func (suite *InstancePeersGetTestSuite) TestInstancePeersGetFunkyParams() {
 	recorder := httptest.NewRecorder()
 	baseURI := fmt.Sprintf("%s://%s", config.GetProtocol(), config.GetHost())
@@ -289,7 +352,7 @@ func (suite *InstancePeersGetTestSuite) TestInstancePeersGetFunkyParams() {
 	b, err := io.ReadAll(result.Body)
 	suite.NoError(err)
 
-	suite.Equal(`{"error":"Bad Request: filter aaaaaaaaaaaaaaaaa not recognized; accepted values are 'open', 'suspended'"}`, string(b))
+	suite.Equal(`{"error":"Bad Request: filter aaaaaaaaaaaaaaaaa not recognized; accepted values are 'open', 'blocked', 'allowed', and 'suspended' (deprecated)"}`, string(b))
 }
 
 func TestInstancePeersGetTestSuite(t *testing.T) {
diff --git a/internal/api/model/domain.go b/internal/api/model/domain.go
index 8d94321d0..b793d77b0 100644
--- a/internal/api/model/domain.go
+++ b/internal/api/model/domain.go
@@ -32,14 +32,17 @@ type Domain struct {
 	// Time at which this domain was silenced. Key will not be present on open domains.
 	// example: 2021-07-30T09:20:25+00:00
 	SilencedAt string `json:"silenced_at,omitempty"`
-	// If the domain is blocked, what's the publicly-stated reason for the block.
+	// If the domain is blocked or allowed, what's the publicly-stated reason (if any).
 	// Alternative to `public_comment` to be used when serializing/deserializing via /api/v1/instance.
 	// example: they smell
 	Comment *string `form:"comment" json:"comment,omitempty"`
-	// If the domain is blocked, what's the publicly-stated reason for the block.
+	// If the domain is blocked or allowed, what's the publicly-stated reason (if any).
 	// Alternative to `comment` to be used when serializing/deserializing NOT via /api/v1/instance.
 	// example: they smell
 	PublicComment *string `form:"public_comment" json:"public_comment,omitempty"`
+	// Severity of this entry.
+	// Only ever set for domain blocks, and if set, always="suspend".
+	Severity string `form:"severity" json:"severity,omitempty"`
 }
 
 // DomainPermission represents a permission applied to one domain (explicit block/allow).