1 files changed, 239 insertions, 0 deletions
diff --git a/internal/processing/interactionrequests/accept.go b/internal/processing/interactionrequests/accept.go
new file mode 100644
index 000000000..ad86e50d1
--- /dev/null
+++ b/internal/processing/interactionrequests/accept.go
@@ -0,0 +1,239 @@
+// 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 interactionrequests
+
+import (
+	"context"
+	"time"
+
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	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/messages"
+	"github.com/superseriousbusiness/gotosocial/internal/uris"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// Accept accepts an interaction request with the given ID,
+// on behalf of the given account (whose post it must target).
+func (p *Processor) Accept(
+	ctx context.Context,
+	acct *gtsmodel.Account,
+	reqID string,
+) (*apimodel.InteractionRequest, gtserror.WithCode) {
+	req, err := p.state.DB.GetInteractionRequestByID(ctx, reqID)
+	if err != nil {
+		err := gtserror.Newf("db error getting interaction request: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if req.TargetAccountID != acct.ID {
+		err := gtserror.Newf(
+			"interaction request %s does not belong to account %s",
+			reqID, acct.ID,
+		)
+		return nil, gtserror.NewErrorNotFound(err)
+	}
+
+	if !req.IsPending() {
+		err := gtserror.Newf(
+			"interaction request %s has already been handled",
+			reqID,
+		)
+		return nil, gtserror.NewErrorNotFound(err)
+	}
+
+	// Lock on the interaction req URI to
+	// ensure nobody else is modifying it rn.
+	unlock := p.state.ProcessingLocks.Lock(req.InteractionURI)
+	defer unlock()
+
+	// Mark the request as accepted
+	// and generate a URI for it.
+	req.AcceptedAt = time.Now()
+	req.URI = uris.GenerateURIForAccept(acct.Username, req.ID)
+	if err := p.state.DB.UpdateInteractionRequest(
+		ctx,
+		req,
+		"accepted_at",
+		"uri",
+	); err != nil {
+		err := gtserror.Newf("db error updating interaction request: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	switch req.InteractionType {
+
+	case gtsmodel.InteractionLike:
+		if errWithCode := p.acceptLike(ctx, req); errWithCode != nil {
+			return nil, errWithCode
+		}
+
+	case gtsmodel.InteractionReply:
+		if errWithCode := p.acceptReply(ctx, req); errWithCode != nil {
+			return nil, errWithCode
+		}
+
+	case gtsmodel.InteractionAnnounce:
+		if errWithCode := p.acceptAnnounce(ctx, req); errWithCode != nil {
+			return nil, errWithCode
+		}
+
+	default:
+		err := gtserror.Newf("unknown interaction type for interaction request %s", reqID)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	// Return the now-accepted req to the caller so
+	// they can do something with it if they need to.
+	apiReq, err := p.converter.InteractionReqToAPIInteractionReq(
+		ctx,
+		req,
+		acct,
+	)
+	if err != nil {
+		err := gtserror.Newf("error converting interaction request: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return apiReq, nil
+}
+
+// Package-internal convenience
+// function to accept a like.
+func (p *Processor) acceptLike(
+	ctx context.Context,
+	req *gtsmodel.InteractionRequest,
+) gtserror.WithCode {
+	// If the Like is missing, that means it's
+	// probably already been undone by someone,
+	// so there's nothing to actually accept.
+	if req.Like == nil {
+		err := gtserror.Newf("no Like found for interaction request %s", req.ID)
+		return gtserror.NewErrorNotFound(err)
+	}
+
+	// Update the Like.
+	req.Like.PendingApproval = util.Ptr(false)
+	req.Like.PreApproved = false
+	req.Like.ApprovedByURI = req.URI
+	if err := p.state.DB.UpdateStatusFave(
+		ctx,
+		req.Like,
+		"pending_approval",
+		"approved_by_uri",
+	); err != nil {
+		err := gtserror.Newf("db error updating status fave: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	// Send the accepted request off through the
+	// client API processor to handle side effects.
+	p.state.Workers.Client.Queue.Push(&messages.FromClientAPI{
+		APObjectType:   ap.ActivityLike,
+		APActivityType: ap.ActivityAccept,
+		GTSModel:       req,
+		Origin:         req.TargetAccount,
+		Target:         req.InteractingAccount,
+	})
+
+	return nil
+}
+
+// Package-internal convenience
+// function to accept a reply.
+func (p *Processor) acceptReply(
+	ctx context.Context,
+	req *gtsmodel.InteractionRequest,
+) gtserror.WithCode {
+	// If the Reply is missing, that means it's
+	// probably already been undone by someone,
+	// so there's nothing to actually accept.
+	if req.Reply == nil {
+		err := gtserror.Newf("no Reply found for interaction request %s", req.ID)
+		return gtserror.NewErrorNotFound(err)
+	}
+
+	// Update the Reply.
+	req.Reply.PendingApproval = util.Ptr(false)
+	req.Reply.PreApproved = false
+	req.Reply.ApprovedByURI = req.URI
+	if err := p.state.DB.UpdateStatus(
+		ctx,
+		req.Reply,
+		"pending_approval",
+		"approved_by_uri",
+	); err != nil {
+		err := gtserror.Newf("db error updating status reply: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	// Send the accepted request off through the
+	// client API processor to handle side effects.
+	p.state.Workers.Client.Queue.Push(&messages.FromClientAPI{
+		APObjectType:   ap.ObjectNote,
+		APActivityType: ap.ActivityAccept,
+		GTSModel:       req,
+		Origin:         req.TargetAccount,
+		Target:         req.InteractingAccount,
+	})
+
+	return nil
+}
+
+// Package-internal convenience
+// function to accept an announce.
+func (p *Processor) acceptAnnounce(
+	ctx context.Context,
+	req *gtsmodel.InteractionRequest,
+) gtserror.WithCode {
+	// If the Announce is missing, that means it's
+	// probably already been undone by someone,
+	// so there's nothing to actually accept.
+	if req.Reply == nil {
+		err := gtserror.Newf("no Announce found for interaction request %s", req.ID)
+		return gtserror.NewErrorNotFound(err)
+	}
+
+	// Update the Announce.
+	req.Announce.PendingApproval = util.Ptr(false)
+	req.Announce.PreApproved = false
+	req.Announce.ApprovedByURI = req.URI
+	if err := p.state.DB.UpdateStatus(
+		ctx,
+		req.Announce,
+		"pending_approval",
+		"approved_by_uri",
+	); err != nil {
+		err := gtserror.Newf("db error updating status announce: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	// Send the accepted request off through the
+	// client API processor to handle side effects.
+	p.state.Workers.Client.Queue.Push(&messages.FromClientAPI{
+		APObjectType:   ap.ActivityAnnounce,
+		APActivityType: ap.ActivityAccept,
+		GTSModel:       req,
+		Origin:         req.TargetAccount,
+		Target:         req.InteractingAccount,
+	})
+
+	return nil
+}