[feature] implement custom_emojis endpoint (#563)

* implement custom_emojis api endpoint

* add tests for getting custom emoji out of the database and converting to api emoji

* change sort direction of emoji query

* change logging level and initialize array with known length as per kim's suggestions

* add continue to lessen risk of making a malformed struct during conversion from db to api emojis

5 files changed, 100 insertions, 0 deletions

diff --git a/internal/processing/media.go b/internal/processing/media.go
index 5bf9ccec4..907ce1fd2 100644
--- a/internal/processing/media.go
+++ b/internal/processing/media.go
@@ -41,3 +41,7 @@ func (p *processor) MediaUpdate(ctx context.Context, authed *oauth.Auth, mediaAt
 func (p *processor) FileGet(ctx context.Context, authed *oauth.Auth, form *apimodel.GetContentRequestForm) (*apimodel.Content, gtserror.WithCode) {
 	return p.mediaProcessor.GetFile(ctx, authed.Account, form)
 }
+
+func (p *processor) CustomEmojisGet(ctx context.Context) ([]*apimodel.Emoji, gtserror.WithCode) {
+	return p.mediaProcessor.GetCustomEmojis(ctx)
+}
diff --git a/internal/processing/media/getemoji.go b/internal/processing/media/getemoji.go
new file mode 100644
index 000000000..e84e5b570
--- /dev/null
+++ b/internal/processing/media/getemoji.go
@@ -0,0 +1,50 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 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 media
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/sirupsen/logrus"
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) GetCustomEmojis(ctx context.Context) ([]*apimodel.Emoji, gtserror.WithCode) {
+	emojis, err := p.db.GetCustomEmojis(ctx)
+	if err != nil {
+		if err != db.ErrNoEntries {
+			return nil, gtserror.NewErrorNotFound(fmt.Errorf("db error retrieving custom emojis: %s", err))
+		}
+	}
+
+	apiEmojis := make([]*apimodel.Emoji, 0, len(emojis))
+	for _, gtsEmoji := range emojis {
+		apiEmoji, err := p.tc.EmojiToAPIEmoji(ctx, gtsEmoji)
+		if err != nil {
+			logrus.Errorf("error converting emoji with id %s: %s", gtsEmoji.ID, err)
+			continue
+		}
+		apiEmojis = append(apiEmojis, &apiEmoji)
+	}
+
+	return apiEmojis, nil
+}
diff --git a/internal/processing/media/getemoji_test.go b/internal/processing/media/getemoji_test.go
new file mode 100644
index 000000000..c655f54cb
--- /dev/null
+++ b/internal/processing/media/getemoji_test.go
@@ -0,0 +1,42 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 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 media_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+)
+
+type GetEmojiTestSuite struct {
+	MediaStandardTestSuite
+}
+
+func (suite *GetEmojiTestSuite) TestGetCustomEmojis() {
+	emojis, err := suite.mediaProcessor.GetCustomEmojis(context.Background())
+
+	suite.NoError(err)
+	suite.Equal(1, len(emojis))
+	suite.Equal("rainbow", emojis[0].Shortcode)
+}
+
+func TestGetEmojiTestSuite(t *testing.T) {
+	suite.Run(t, &GetEmojiTestSuite{})
+}
diff --git a/internal/processing/media/media.go b/internal/processing/media/media.go
index 2beac922a..e895e0837 100644
--- a/internal/processing/media/media.go
+++ b/internal/processing/media/media.go
@@ -39,6 +39,7 @@ type Processor interface {
 	Delete(ctx context.Context, mediaAttachmentID string) gtserror.WithCode
 	// GetFile retrieves a file from storage and streams it back to the caller via an io.reader embedded in *apimodel.Content.
 	GetFile(ctx context.Context, account *gtsmodel.Account, form *apimodel.GetContentRequestForm) (*apimodel.Content, gtserror.WithCode)
+	GetCustomEmojis(ctx context.Context) ([]*apimodel.Emoji, gtserror.WithCode)
 	GetMedia(ctx context.Context, account *gtsmodel.Account, mediaAttachmentID string) (*apimodel.Attachment, gtserror.WithCode)
 	Update(ctx context.Context, account *gtsmodel.Account, mediaAttachmentID string, form *apimodel.AttachmentUpdateRequest) (*apimodel.Attachment, gtserror.WithCode)
 }
diff --git a/internal/processing/processor.go b/internal/processing/processor.go
index f34cc568f..225606b70 100644
--- a/internal/processing/processor.go
+++ b/internal/processing/processor.go
@@ -122,6 +122,9 @@ type Processor interface {
 	// BlocksGet returns a list of accounts blocked by the requesting account.
 	BlocksGet(ctx context.Context, authed *oauth.Auth, maxID string, sinceID string, limit int) (*apimodel.BlocksResponse, gtserror.WithCode)
 
+	// CustomEmojisGet returns an array of info about the custom emojis on this server
+	CustomEmojisGet(ctx context.Context) ([]*apimodel.Emoji, gtserror.WithCode)
+
 	// FileGet handles the fetching of a media attachment file via the fileserver.
 	FileGet(ctx context.Context, authed *oauth.Auth, form *apimodel.GetContentRequestForm) (*apimodel.Content, gtserror.WithCode)