[feature] Allow users to set default interaction policies per status visibility (#3108)

* [feature] Allow users to set default interaction policies

* use vars for default policies

* avoid some code repetition

* unfuck form binding

* avoid bonkers loop

* beep boop

* put policyValsToAPIPolicyVals in separate function

* don't bother with slices.Grow

* oops

8 files changed, 730 insertions, 57 deletions

diff --git a/internal/api/client.go b/internal/api/client.go
index 07fc82aaa..b8b226804 100644
--- a/internal/api/client.go
+++ b/internal/api/client.go
@@ -34,6 +34,7 @@ import (
 	filtersV2 "github.com/superseriousbusiness/gotosocial/internal/api/client/filters/v2"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/followrequests"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/instance"
+	"github.com/superseriousbusiness/gotosocial/internal/api/client/interactionpolicies"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/lists"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/markers"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/media"
@@ -58,32 +59,33 @@ type Client struct {
 	processor *processing.Processor
 	db        db.DB
 
-	accounts       *accounts.Module       // api/v1/accounts
-	admin          *admin.Module          // api/v1/admin
-	apps           *apps.Module           // api/v1/apps
-	blocks         *blocks.Module         // api/v1/blocks
-	bookmarks      *bookmarks.Module      // api/v1/bookmarks
-	conversations  *conversations.Module  // api/v1/conversations
-	customEmojis   *customemojis.Module   // api/v1/custom_emojis
-	favourites     *favourites.Module     // api/v1/favourites
-	featuredTags   *featuredtags.Module   // api/v1/featured_tags
-	filtersV1      *filtersV1.Module      // api/v1/filters
-	filtersV2      *filtersV2.Module      // api/v2/filters
-	followRequests *followrequests.Module // api/v1/follow_requests
-	instance       *instance.Module       // api/v1/instance
-	lists          *lists.Module          // api/v1/lists
-	markers        *markers.Module        // api/v1/markers
-	media          *media.Module          // api/v1/media, api/v2/media
-	mutes          *mutes.Module          // api/v1/mutes
-	notifications  *notifications.Module  // api/v1/notifications
-	polls          *polls.Module          // api/v1/polls
-	preferences    *preferences.Module    // api/v1/preferences
-	reports        *reports.Module        // api/v1/reports
-	search         *search.Module         // api/v1/search, api/v2/search
-	statuses       *statuses.Module       // api/v1/statuses
-	streaming      *streaming.Module      // api/v1/streaming
-	timelines      *timelines.Module      // api/v1/timelines
-	user           *user.Module           // api/v1/user
+	accounts            *accounts.Module            // api/v1/accounts
+	admin               *admin.Module               // api/v1/admin
+	apps                *apps.Module                // api/v1/apps
+	blocks              *blocks.Module              // api/v1/blocks
+	bookmarks           *bookmarks.Module           // api/v1/bookmarks
+	conversations       *conversations.Module       // api/v1/conversations
+	customEmojis        *customemojis.Module        // api/v1/custom_emojis
+	favourites          *favourites.Module          // api/v1/favourites
+	featuredTags        *featuredtags.Module        // api/v1/featured_tags
+	filtersV1           *filtersV1.Module           // api/v1/filters
+	filtersV2           *filtersV2.Module           // api/v2/filters
+	followRequests      *followrequests.Module      // api/v1/follow_requests
+	instance            *instance.Module            // api/v1/instance
+	interactionPolicies *interactionpolicies.Module // api/v1/interaction_policies
+	lists               *lists.Module               // api/v1/lists
+	markers             *markers.Module             // api/v1/markers
+	media               *media.Module               // api/v1/media, api/v2/media
+	mutes               *mutes.Module               // api/v1/mutes
+	notifications       *notifications.Module       // api/v1/notifications
+	polls               *polls.Module               // api/v1/polls
+	preferences         *preferences.Module         // api/v1/preferences
+	reports             *reports.Module             // api/v1/reports
+	search              *search.Module              // api/v1/search, api/v2/search
+	statuses            *statuses.Module            // api/v1/statuses
+	streaming           *streaming.Module           // api/v1/streaming
+	timelines           *timelines.Module           // api/v1/timelines
+	user                *user.Module                // api/v1/user
 }
 
 func (c *Client) Route(r *router.Router, m ...gin.HandlerFunc) {
@@ -116,6 +118,7 @@ func (c *Client) Route(r *router.Router, m ...gin.HandlerFunc) {
 	c.filtersV2.Route(h)
 	c.followRequests.Route(h)
 	c.instance.Route(h)
+	c.interactionPolicies.Route(h)
 	c.lists.Route(h)
 	c.markers.Route(h)
 	c.media.Route(h)
@@ -136,31 +139,32 @@ func NewClient(state *state.State, p *processing.Processor) *Client {
 		processor: p,
 		db:        state.DB,
 
-		accounts:       accounts.New(p),
-		admin:          admin.New(state, p),
-		apps:           apps.New(p),
-		blocks:         blocks.New(p),
-		bookmarks:      bookmarks.New(p),
-		conversations:  conversations.New(p),
-		customEmojis:   customemojis.New(p),
-		favourites:     favourites.New(p),
-		featuredTags:   featuredtags.New(p),
-		filtersV1:      filtersV1.New(p),
-		filtersV2:      filtersV2.New(p),
-		followRequests: followrequests.New(p),
-		instance:       instance.New(p),
-		lists:          lists.New(p),
-		markers:        markers.New(p),
-		media:          media.New(p),
-		mutes:          mutes.New(p),
-		notifications:  notifications.New(p),
-		polls:          polls.New(p),
-		preferences:    preferences.New(p),
-		reports:        reports.New(p),
-		search:         search.New(p),
-		statuses:       statuses.New(p),
-		streaming:      streaming.New(p, time.Second*30, 4096),
-		timelines:      timelines.New(p),
-		user:           user.New(p),
+		accounts:            accounts.New(p),
+		admin:               admin.New(state, p),
+		apps:                apps.New(p),
+		blocks:              blocks.New(p),
+		bookmarks:           bookmarks.New(p),
+		conversations:       conversations.New(p),
+		customEmojis:        customemojis.New(p),
+		favourites:          favourites.New(p),
+		featuredTags:        featuredtags.New(p),
+		filtersV1:           filtersV1.New(p),
+		filtersV2:           filtersV2.New(p),
+		followRequests:      followrequests.New(p),
+		instance:            instance.New(p),
+		interactionPolicies: interactionpolicies.New(p),
+		lists:               lists.New(p),
+		markers:             markers.New(p),
+		media:               media.New(p),
+		mutes:               mutes.New(p),
+		notifications:       notifications.New(p),
+		polls:               polls.New(p),
+		preferences:         preferences.New(p),
+		reports:             reports.New(p),
+		search:              search.New(p),
+		statuses:            statuses.New(p),
+		streaming:           streaming.New(p, time.Second*30, 4096),
+		timelines:           timelines.New(p),
+		user:                user.New(p),
 	}
 }
diff --git a/internal/api/client/admin/reportsget_test.go b/internal/api/client/admin/reportsget_test.go
index 28efabc00..265920409 100644
--- a/internal/api/client/admin/reportsget_test.go
+++ b/internal/api/client/admin/reportsget_test.go
@@ -528,7 +528,27 @@ func (suite *ReportsGetTestSuite) TestReportsGetAll() {
         "tags": [],
         "emojis": [],
         "card": null,
-        "poll": null
+        "poll": null,
+        "interaction_policy": {
+          "can_favourite": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          },
+          "can_reply": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          },
+          "can_reblog": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          }
+        }
       }
     ],
     "rules": [
@@ -750,7 +770,27 @@ func (suite *ReportsGetTestSuite) TestReportsGetCreatedByAccount() {
         "tags": [],
         "emojis": [],
         "card": null,
-        "poll": null
+        "poll": null,
+        "interaction_policy": {
+          "can_favourite": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          },
+          "can_reply": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          },
+          "can_reblog": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          }
+        }
       }
     ],
     "rules": [
@@ -972,7 +1012,27 @@ func (suite *ReportsGetTestSuite) TestReportsGetTargetAccount() {
         "tags": [],
         "emojis": [],
         "card": null,
-        "poll": null
+        "poll": null,
+        "interaction_policy": {
+          "can_favourite": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          },
+          "can_reply": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          },
+          "can_reblog": {
+            "always": [
+              "public"
+            ],
+            "with_approval": []
+          }
+        }
       }
     ],
     "rules": [
diff --git a/internal/api/client/interactionpolicies/getdefaults.go b/internal/api/client/interactionpolicies/getdefaults.go
new file mode 100644
index 000000000..4ad0071f4
--- /dev/null
+++ b/internal/api/client/interactionpolicies/getdefaults.go
@@ -0,0 +1,77 @@
+// 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 interactionpolicies
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+// PoliciesDefaultsGETHandler swagger:operation GET /api/v1/interaction_policies/defaults policiesDefaultsGet
+//
+// Get default interaction policies for new statuses created by you.
+//
+//	---
+//	tags:
+//	- interaction_policies
+//
+//	produces:
+//	- application/json
+//
+//	security:
+//	- OAuth2 Bearer:
+//		- read:accounts
+//
+//	responses:
+//		'200':
+//			description: A default policies object containing a policy for each status visibility.
+//			schema:
+//				"$ref": "#/definitions/defaultPolicies"
+//		'401':
+//			description: unauthorized
+//		'406':
+//			description: not acceptable
+//		'500':
+//			description: internal server error
+func (m *Module) PoliciesDefaultsGETHandler(c *gin.Context) {
+	authed, err := oauth.Authed(c, true, true, true, true)
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), 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
+	}
+
+	resp, errWithCode := m.processor.Account().DefaultInteractionPoliciesGet(
+		c.Request.Context(),
+		authed.Account,
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	apiutil.JSON(c, http.StatusOK, resp)
+}
diff --git a/internal/api/client/interactionpolicies/policies.go b/internal/api/client/interactionpolicies/policies.go
new file mode 100644
index 000000000..9b34a8c80
--- /dev/null
+++ b/internal/api/client/interactionpolicies/policies.go
@@ -0,0 +1,45 @@
+// 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 interactionpolicies
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/superseriousbusiness/gotosocial/internal/processing"
+)
+
+const (
+	BasePath     = "/v1/interaction_policies"
+	DefaultsPath = BasePath + "/defaults"
+)
+
+type Module struct {
+	processor *processing.Processor
+}
+
+func New(processor *processing.Processor) *Module {
+	return &Module{
+		processor: processor,
+	}
+}
+
+func (m *Module) Route(attachHandler func(method string, path string, f ...gin.HandlerFunc) gin.IRoutes) {
+	attachHandler(http.MethodGet, DefaultsPath, m.PoliciesDefaultsGETHandler)
+	attachHandler(http.MethodPatch, DefaultsPath, m.PoliciesDefaultsPATCHHandler)
+}
diff --git a/internal/api/client/interactionpolicies/updatedefaults.go b/internal/api/client/interactionpolicies/updatedefaults.go
new file mode 100644
index 000000000..e11a3bd19
--- /dev/null
+++ b/internal/api/client/interactionpolicies/updatedefaults.go
@@ -0,0 +1,334 @@
+// 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 interactionpolicies
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/gin-gonic/gin/binding"
+	"github.com/go-playground/form/v4"
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+// PoliciesDefaultsPATCHHandler swagger:operation PATCH /api/v1/interaction_policies/defaults policiesDefaultsUpdate
+//
+// Update default interaction policies per visibility level for new statuses created by you.
+//
+// If submitting using form data, use the following pattern:
+//
+// `VISIBILITY[INTERACTION_TYPE][CONDITION][INDEX]=Value`
+//
+// For example: `public[can_reply][always][0]=author`
+//
+// Using `curl` this might look something like:
+//
+// `curl -F 'public[can_reply][always][0]=author' -F 'public[can_reply][always][1]=followers'`
+//
+// The JSON equivalent would be:
+//
+// `curl -H 'Content-Type: application/json' -d '{"public":{"can_reply":{"always":["author","followers"]}}}'`
+//
+// Any visibility level left unspecified in the request body will be returned to the default.
+//
+// Ie., in the example above, "public" would be updated, but "unlisted", "private", and "direct" would be reset to defaults.
+//
+// The server will perform some normalization on submitted policies so that you can't submit totally invalid policies.
+//
+//	---
+//	tags:
+//	- interaction_policies
+//
+//	consumes:
+//	- multipart/form-data
+//	- application/x-www-form-urlencoded
+//	- application/json
+//
+//	produces:
+//	- application/json
+//
+//	parameters:
+//	-
+//		name: public[can_favourite][always][0]
+//		in: formData
+//		description: Nth entry for public.can_favourite.always.
+//		type: string
+//	-
+//		name: public[can_favourite][with_approval][0]
+//		in: formData
+//		description: Nth entry for public.can_favourite.with_approval.
+//		type: string
+//	-
+//		name: public[can_reply][always][0]
+//		in: formData
+//		description: Nth entry for public.can_reply.always.
+//		type: string
+//	-
+//		name: public[can_reply][with_approval][0]
+//		in: formData
+//		description: Nth entry for public.can_reply.with_approval.
+//		type: string
+//	-
+//		name: public[can_reblog][always][0]
+//		in: formData
+//		description: Nth entry for public.can_reblog.always.
+//		type: string
+//	-
+//		name: public[can_reblog][with_approval][0]
+//		in: formData
+//		description: Nth entry for public.can_reblog.with_approval.
+//		type: string
+//
+//	-
+//		name: unlisted[can_favourite][always][0]
+//		in: formData
+//		description: Nth entry for unlisted.can_favourite.always.
+//		type: string
+//	-
+//		name: unlisted[can_favourite][with_approval][0]
+//		in: formData
+//		description: Nth entry for unlisted.can_favourite.with_approval.
+//		type: string
+//	-
+//		name: unlisted[can_reply][always][0]
+//		in: formData
+//		description: Nth entry for unlisted.can_reply.always.
+//		type: string
+//	-
+//		name: unlisted[can_reply][with_approval][0]
+//		in: formData
+//		description: Nth entry for unlisted.can_reply.with_approval.
+//		type: string
+//	-
+//		name: unlisted[can_reblog][always][0]
+//		in: formData
+//		description: Nth entry for unlisted.can_reblog.always.
+//		type: string
+//	-
+//		name: unlisted[can_reblog][with_approval][0]
+//		in: formData
+//		description: Nth entry for unlisted.can_reblog.with_approval.
+//		type: string
+//
+//	-
+//		name: private[can_favourite][always][0]
+//		in: formData
+//		description: Nth entry for private.can_favourite.always.
+//		type: string
+//	-
+//		name: private[can_favourite][with_approval][0]
+//		in: formData
+//		description: Nth entry for private.can_favourite.with_approval.
+//		type: string
+//	-
+//		name: private[can_reply][always][0]
+//		in: formData
+//		description: Nth entry for private.can_reply.always.
+//		type: string
+//	-
+//		name: private[can_reply][with_approval][0]
+//		in: formData
+//		description: Nth entry for private.can_reply.with_approval.
+//		type: string
+//	-
+//		name: private[can_reblog][always][0]
+//		in: formData
+//		description: Nth entry for private.can_reblog.always.
+//		type: string
+//	-
+//		name: private[can_reblog][with_approval][0]
+//		in: formData
+//		description: Nth entry for private.can_reblog.with_approval.
+//		type: string
+//
+//	-
+//		name: direct[can_favourite][always][0]
+//		in: formData
+//		description: Nth entry for direct.can_favourite.always.
+//		type: string
+//	-
+//		name: direct[can_favourite][with_approval][0]
+//		in: formData
+//		description: Nth entry for direct.can_favourite.with_approval.
+//		type: string
+//	-
+//		name: direct[can_reply][always][0]
+//		in: formData
+//		description: Nth entry for direct.can_reply.always.
+//		type: string
+//	-
+//		name: direct[can_reply][with_approval][0]
+//		in: formData
+//		description: Nth entry for direct.can_reply.with_approval.
+//		type: string
+//	-
+//		name: direct[can_reblog][always][0]
+//		in: formData
+//		description: Nth entry for direct.can_reblog.always.
+//		type: string
+//	-
+//		name: direct[can_reblog][with_approval][0]
+//		in: formData
+//		description: Nth entry for direct.can_reblog.with_approval.
+//		type: string
+//
+//	security:
+//	- OAuth2 Bearer:
+//		- write:accounts
+//
+//	responses:
+//		'200':
+//			description: Updated default policies object containing a policy for each status visibility.
+//			schema:
+//				"$ref": "#/definitions/defaultPolicies"
+//		'400':
+//			description: bad request
+//		'401':
+//			description: unauthorized
+//		'406':
+//			description: not acceptable
+//		'422':
+//			description: unprocessable
+//		'500':
+//			description: internal server error
+func (m *Module) PoliciesDefaultsPATCHHandler(c *gin.Context) {
+	authed, err := oauth.Authed(c, true, true, true, true)
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), 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
+	}
+
+	form, err := parseUpdateAccountForm(c)
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	resp, errWithCode := m.processor.Account().DefaultInteractionPoliciesUpdate(
+		c.Request.Context(),
+		authed.Account,
+		form,
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
+	}
+
+	apiutil.JSON(c, http.StatusOK, resp)
+}
+
+// intPolicyFormBinding satisfies gin's binding.Binding interface.
+// Should only be used specifically for multipart/form-data MIME type.
+type intPolicyFormBinding struct {
+	visibility string
+}
+
+func (i intPolicyFormBinding) Name() string {
+	return i.visibility
+}
+
+func (intPolicyFormBinding) Bind(req *http.Request, obj any) error {
+	if err := req.ParseForm(); err != nil {
+		return err
+	}
+
+	// Change default namespace prefix and suffix to
+	// allow correct parsing of the field attributes.
+	decoder := form.NewDecoder()
+	decoder.SetNamespacePrefix("[")
+	decoder.SetNamespaceSuffix("]")
+
+	return decoder.Decode(obj, req.Form)
+}
+
+// customBind does custom form binding for
+// each visibility in the form data.
+func customBind(
+	c *gin.Context,
+	form *apimodel.UpdateInteractionPoliciesRequest,
+) error {
+	for _, vis := range []string{
+		"Direct",
+		"Private",
+		"Unlisted",
+		"Public",
+	} {
+		if err := c.ShouldBindWith(
+			form,
+			intPolicyFormBinding{
+				visibility: vis,
+			},
+		); err != nil {
+			return fmt.Errorf("custom form binding failed: %w", err)
+		}
+	}
+
+	return nil
+}
+
+func parseUpdateAccountForm(c *gin.Context) (*apimodel.UpdateInteractionPoliciesRequest, error) {
+	form := new(apimodel.UpdateInteractionPoliciesRequest)
+
+	switch ct := c.ContentType(); ct {
+	case binding.MIMEJSON:
+		// Just bind with default json binding.
+		if err := c.ShouldBindWith(form, binding.JSON); err != nil {
+			return nil, err
+		}
+
+	case binding.MIMEPOSTForm:
+		// Bind with default form binding first.
+		if err := c.ShouldBindWith(form, binding.FormPost); err != nil {
+			return nil, err
+		}
+
+		// Now do custom binding.
+		if err := customBind(c, form); err != nil {
+			return nil, err
+		}
+
+	case binding.MIMEMultipartPOSTForm:
+		// Bind with default form binding first.
+		if err := c.ShouldBindWith(form, binding.FormMultipart); err != nil {
+			return nil, err
+		}
+
+		// Now do custom binding.
+		if err := customBind(c, form); err != nil {
+			return nil, err
+		}
+
+	default:
+		err := fmt.Errorf(
+			"content-type %s not supported for this endpoint; supported content-types are %s, %s, %s",
+			ct, binding.MIMEJSON, binding.MIMEPOSTForm, binding.MIMEMultipartPOSTForm,
+		)
+		return nil, err
+	}
+
+	return form, nil
+}
diff --git a/internal/api/client/statuses/statusmute_test.go b/internal/api/client/statuses/statusmute_test.go
index 01bea4e5c..9e517b36d 100644
--- a/internal/api/client/statuses/statusmute_test.go
+++ b/internal/api/client/statuses/statusmute_test.go
@@ -147,7 +147,27 @@ func (suite *StatusMuteTestSuite) TestMuteUnmuteStatus() {
   "emojis": [],
   "card": null,
   "poll": null,
-  "text": "hello everyone!"
+  "text": "hello everyone!",
+  "interaction_policy": {
+    "can_favourite": {
+      "always": [
+        "public"
+      ],
+      "with_approval": []
+    },
+    "can_reply": {
+      "always": [
+        "public"
+      ],
+      "with_approval": []
+    },
+    "can_reblog": {
+      "always": [
+        "public"
+      ],
+      "with_approval": []
+    }
+  }
 }`, muted)
 
 	// Unmute the status, ensure `muted` is `false`.
@@ -212,7 +232,27 @@ func (suite *StatusMuteTestSuite) TestMuteUnmuteStatus() {
   "emojis": [],
   "card": null,
   "poll": null,
-  "text": "hello everyone!"
+  "text": "hello everyone!",
+  "interaction_policy": {
+    "can_favourite": {
+      "always": [
+        "public"
+      ],
+      "with_approval": []
+    },
+    "can_reply": {
+      "always": [
+        "public"
+      ],
+      "with_approval": []
+    },
+    "can_reblog": {
+      "always": [
+        "public"
+      ],
+      "with_approval": []
+    }
+  }
 }`, unmuted)
 }
 
diff --git a/internal/api/model/interactionpolicy.go b/internal/api/model/interactionpolicy.go
new file mode 100644
index 000000000..7c5df09e8
--- /dev/null
+++ b/internal/api/model/interactionpolicy.go
@@ -0,0 +1,111 @@
+// 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 model
+
+// One interaction policy entry for a status.
+//
+// It can be EITHER one of the internal keywords listed below, OR a full-fledged ActivityPub URI of an Actor, like "https://example.org/users/some_user".
+//
+// Internal keywords:
+//
+//   - public    - Public, aka anyone who can see the status according to its visibility level.
+//   - followers - Followers of the status author.
+//   - following - People followed by the status author.
+//   - mutuals   - Mutual follows of the status author (reserved, unused).
+//   - mentioned - Accounts mentioned in, or replied-to by, the status.
+//   - author    - The status author themself.
+//   - me        - If request was made with an authorized user, "me" represents the user who made the request and is now looking at this interaction policy.
+//
+// swagger:model interactionPolicyValue
+type PolicyValue string
+
+const (
+	PolicyValuePublic    PolicyValue = "public"    // Public, aka anyone who can see the status according to its visibility level.
+	PolicyValueFollowers PolicyValue = "followers" // Followers of the status author.
+	PolicyValueFollowing PolicyValue = "following" // People followed by the status author.
+	PolicyValueMutuals   PolicyValue = "mutuals"   // Mutual follows of the status author (reserved, unused).
+	PolicyValueMentioned PolicyValue = "mentioned" // Accounts mentioned in, or replied-to by, the status.
+	PolicyValueAuthor    PolicyValue = "author"    // The status author themself.
+	PolicyValueMe        PolicyValue = "me"        // If request was made with an authorized user, "me" represents the user who made the request and is now looking at this interaction policy.
+)
+
+// Rules for one interaction type.
+//
+// swagger:model interactionPolicyRules
+type PolicyRules struct {
+	// Policy entries for accounts that can always do this type of interaction.
+	Always []PolicyValue `form:"always" json:"always"`
+	// Policy entries for accounts that require approval to do this type of interaction.
+	WithApproval []PolicyValue `form:"with_approval" json:"with_approval"`
+}
+
+// Interaction policy of a status.
+//
+// swagger:model interactionPolicy
+type InteractionPolicy struct {
+	// Rules for who can favourite this status.
+	CanFavourite PolicyRules `form:"can_favourite" json:"can_favourite"`
+	// Rules for who can reply to this status.
+	CanReply PolicyRules `form:"can_reply" json:"can_reply"`
+	// Rules for who can reblog this status.
+	CanReblog PolicyRules `form:"can_reblog" json:"can_reblog"`
+}
+
+// Default interaction policies to use for new statuses by requesting account.
+//
+// swagger:model defaultPolicies
+type DefaultPolicies struct {
+	// TODO: Add mutuals only default.
+
+	// Default policy for new direct visibility statuses.
+	Direct InteractionPolicy `json:"direct"`
+	// Default policy for new private/followers-only visibility statuses.
+	Private InteractionPolicy `json:"private"`
+	// Default policy for new unlisted/unlocked visibility statuses.
+	Unlisted InteractionPolicy `json:"unlisted"`
+	// Default policy for new public visibility statuses.
+	Public InteractionPolicy `json:"public"`
+}
+
+// swagger:ignore
+type UpdateInteractionPoliciesRequest struct {
+	// Default policy for new direct visibility statuses.
+	// Value `null` or omitted property resets policy to original default.
+	//
+	// in: formData
+	// nullable: true
+	Direct *InteractionPolicy `form:"direct" json:"direct"`
+	// Default policy for new private/followers-only visibility statuses.
+	// Value `null` or omitted property resets policy to original default.
+	//
+	// in: formData
+	// nullable: true
+	Private *InteractionPolicy `form:"private" json:"private"`
+	// Default policy for new unlisted/unlocked visibility statuses.
+	// Value `null` or omitted property resets policy to original default.
+	//
+	// in: formData
+	// nullable: true
+	Unlisted *InteractionPolicy `form:"unlisted" json:"unlisted"`
+	// Default policy for new public visibility statuses.
+	// Value `null` or omitted property resets policy to original default.
+	//
+	// in: formData
+	// nullable: true
+	Public *InteractionPolicy `form:"public" json:"public"`
+}
diff --git a/internal/api/model/status.go b/internal/api/model/status.go
index e469835bd..7358916ab 100644
--- a/internal/api/model/status.go
+++ b/internal/api/model/status.go
@@ -102,6 +102,8 @@ type Status struct {
 	Text string `json:"text,omitempty"`
 	// A list of filters that matched this status and why they matched, if there are any such filters.
 	Filtered []FilterResult `json:"filtered,omitempty"`
+	// The interaction policy for this status, as set by the status author.
+	InteractionPolicy InteractionPolicy `json:"interaction_policy"`
 }
 
 // WebStatus is like *model.Status, but contains