[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

internal/processing/account/interactionpolicies.go

@@ -0,0 +1,208 @@
+// 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 account
+
+import (
+	"cmp"
+	"context"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+)
+
+func (p *Processor) DefaultInteractionPoliciesGet(
+	ctx context.Context,
+	requester *gtsmodel.Account,
+) (*apimodel.DefaultPolicies, gtserror.WithCode) {
+	// Ensure account settings populated.
+	if err := p.populateAccountSettings(ctx, requester); err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	// Take set "direct" policy
+	// or global default.
+	direct := cmp.Or(
+		requester.Settings.InteractionPolicyDirect,
+		gtsmodel.DefaultInteractionPolicyDirect(),
+	)
+
+	directAPI, err := p.converter.InteractionPolicyToAPIInteractionPolicy(ctx, direct, nil, nil)
+	if err != nil {
+		err := gtserror.Newf("error converting interaction policy direct: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	// Take set "private" policy
+	// or global default.
+	private := cmp.Or(
+		requester.Settings.InteractionPolicyFollowersOnly,
+		gtsmodel.DefaultInteractionPolicyFollowersOnly(),
+	)
+
+	privateAPI, err := p.converter.InteractionPolicyToAPIInteractionPolicy(ctx, private, nil, nil)
+	if err != nil {
+		err := gtserror.Newf("error converting interaction policy private: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	// Take set "unlisted" policy
+	// or global default.
+	unlisted := cmp.Or(
+		requester.Settings.InteractionPolicyUnlocked,
+		gtsmodel.DefaultInteractionPolicyUnlocked(),
+	)
+
+	unlistedAPI, err := p.converter.InteractionPolicyToAPIInteractionPolicy(ctx, unlisted, nil, nil)
+	if err != nil {
+		err := gtserror.Newf("error converting interaction policy unlisted: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	// Take set "public" policy
+	// or global default.
+	public := cmp.Or(
+		requester.Settings.InteractionPolicyPublic,
+		gtsmodel.DefaultInteractionPolicyPublic(),
+	)
+
+	publicAPI, err := p.converter.InteractionPolicyToAPIInteractionPolicy(ctx, public, nil, nil)
+	if err != nil {
+		err := gtserror.Newf("error converting interaction policy public: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return &apimodel.DefaultPolicies{
+		Direct:   *directAPI,
+		Private:  *privateAPI,
+		Unlisted: *unlistedAPI,
+		Public:   *publicAPI,
+	}, nil
+}
+
+func (p *Processor) DefaultInteractionPoliciesUpdate(
+	ctx context.Context,
+	requester *gtsmodel.Account,
+	form *apimodel.UpdateInteractionPoliciesRequest,
+) (*apimodel.DefaultPolicies, gtserror.WithCode) {
+	// Lock on this account as we're modifying its Settings.
+	unlock := p.state.ProcessingLocks.Lock(requester.URI)
+	defer unlock()
+
+	// Ensure account settings populated.
+	if err := p.populateAccountSettings(ctx, requester); err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if form.Direct == nil {
+		// Unset/return to global default.
+		requester.Settings.InteractionPolicyDirect = nil
+	} else {
+		policy, err := typeutils.APIInteractionPolicyToInteractionPolicy(
+			form.Direct,
+			apimodel.VisibilityDirect,
+		)
+		if err != nil {
+			return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
+		}
+
+		// Set new default policy.
+		requester.Settings.InteractionPolicyDirect = policy
+	}
+
+	if form.Private == nil {
+		// Unset/return to global default.
+		requester.Settings.InteractionPolicyFollowersOnly = nil
+	} else {
+		policy, err := typeutils.APIInteractionPolicyToInteractionPolicy(
+			form.Private,
+			apimodel.VisibilityPrivate,
+		)
+		if err != nil {
+			return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
+		}
+
+		// Set new default policy.
+		requester.Settings.InteractionPolicyFollowersOnly = policy
+	}
+
+	if form.Unlisted == nil {
+		// Unset/return to global default.
+		requester.Settings.InteractionPolicyUnlocked = nil
+	} else {
+		policy, err := typeutils.APIInteractionPolicyToInteractionPolicy(
+			form.Unlisted,
+			apimodel.VisibilityUnlisted,
+		)
+		if err != nil {
+			return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
+		}
+
+		// Set new default policy.
+		requester.Settings.InteractionPolicyUnlocked = policy
+	}
+
+	if form.Public == nil {
+		// Unset/return to global default.
+		requester.Settings.InteractionPolicyPublic = nil
+	} else {
+		policy, err := typeutils.APIInteractionPolicyToInteractionPolicy(
+			form.Public,
+			apimodel.VisibilityPublic,
+		)
+		if err != nil {
+			return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
+		}
+
+		// Set new default policy.
+		requester.Settings.InteractionPolicyPublic = policy
+	}
+
+	if err := p.state.DB.UpdateAccountSettings(ctx, requester.Settings); err != nil {
+		err := gtserror.Newf("db error updating setttings: %w", err)
+		return nil, gtserror.NewErrorInternalError(err, err.Error())
+	}
+
+	return p.DefaultInteractionPoliciesGet(ctx, requester)
+}
+
+// populateAccountSettings just ensures that
+// Settings is populated on the given account.
+func (p *Processor) populateAccountSettings(
+	ctx context.Context,
+	acct *gtsmodel.Account,
+) error {
+	if acct.Settings != nil {
+		// Already populated.
+		return nil
+	}
+
+	// Not populated,
+	// get from db.
+	var err error
+	acct.Settings, err = p.state.DB.GetAccountSettings(ctx, acct.ID)
+	if err != nil {
+		return gtserror.Newf(
+			"db error getting settings for account %s: %w",
+			acct.ID, err,
+		)
+	}
+
+	return nil
+}