More SQLite (#871)

* SQLite support for appservice

* SQLite support for mediaapi

* Copyright notices

* SQLite for public rooms API (although with some slight differences in behaviour)

* Lazy match aliases, add TODOs

6 files changed, 460 insertions, 0 deletions

diff --git a/mediaapi/storage/sqlite3/media_repository_table.go b/mediaapi/storage/sqlite3/media_repository_table.go
new file mode 100644
index 00000000..8e2e6236
--- /dev/null
+++ b/mediaapi/storage/sqlite3/media_repository_table.go
@@ -0,0 +1,115 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const mediaSchema = `
+-- The media_repository table holds metadata for each media file stored and accessible to the local server,
+-- the actual file is stored separately.
+CREATE TABLE IF NOT EXISTS mediaapi_media_repository (
+    -- The id used to refer to the media.
+    -- For uploads to this server this is a base64-encoded sha256 hash of the file data
+    -- For media from remote servers, this can be any unique identifier string
+    media_id TEXT NOT NULL,
+    -- The origin of the media as requested by the client. Should be a homeserver domain.
+    media_origin TEXT NOT NULL,
+    -- The MIME-type of the media file as specified when uploading.
+    content_type TEXT NOT NULL,
+    -- Size of the media file in bytes.
+    file_size_bytes INTEGER NOT NULL,
+    -- When the content was uploaded in UNIX epoch ms.
+    creation_ts INTEGER NOT NULL,
+    -- The file name with which the media was uploaded.
+    upload_name TEXT NOT NULL,
+    -- Alternate RFC 4648 unpadded base64 encoding string representation of a SHA-256 hash sum of the file data.
+    base64hash TEXT NOT NULL,
+    -- The user who uploaded the file. Should be a Matrix user ID.
+    user_id TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS mediaapi_media_repository_index ON mediaapi_media_repository (media_id, media_origin);
+`
+
+const insertMediaSQL = `
+INSERT INTO mediaapi_media_repository (media_id, media_origin, content_type, file_size_bytes, creation_ts, upload_name, base64hash, user_id)
+    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+`
+
+const selectMediaSQL = `
+SELECT content_type, file_size_bytes, creation_ts, upload_name, base64hash, user_id FROM mediaapi_media_repository WHERE media_id = $1 AND media_origin = $2
+`
+
+type mediaStatements struct {
+	insertMediaStmt *sql.Stmt
+	selectMediaStmt *sql.Stmt
+}
+
+func (s *mediaStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(mediaSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertMediaStmt, insertMediaSQL},
+		{&s.selectMediaStmt, selectMediaSQL},
+	}.prepare(db)
+}
+
+func (s *mediaStatements) insertMedia(
+	ctx context.Context, mediaMetadata *types.MediaMetadata,
+) error {
+	mediaMetadata.CreationTimestamp = types.UnixMs(time.Now().UnixNano() / 1000000)
+	_, err := s.insertMediaStmt.ExecContext(
+		ctx,
+		mediaMetadata.MediaID,
+		mediaMetadata.Origin,
+		mediaMetadata.ContentType,
+		mediaMetadata.FileSizeBytes,
+		mediaMetadata.CreationTimestamp,
+		mediaMetadata.UploadName,
+		mediaMetadata.Base64Hash,
+		mediaMetadata.UserID,
+	)
+	return err
+}
+
+func (s *mediaStatements) selectMedia(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) (*types.MediaMetadata, error) {
+	mediaMetadata := types.MediaMetadata{
+		MediaID: mediaID,
+		Origin:  mediaOrigin,
+	}
+	err := s.selectMediaStmt.QueryRowContext(
+		ctx, mediaMetadata.MediaID, mediaMetadata.Origin,
+	).Scan(
+		&mediaMetadata.ContentType,
+		&mediaMetadata.FileSizeBytes,
+		&mediaMetadata.CreationTimestamp,
+		&mediaMetadata.UploadName,
+		&mediaMetadata.Base64Hash,
+		&mediaMetadata.UserID,
+	)
+	return &mediaMetadata, err
+}
diff --git a/mediaapi/storage/sqlite3/prepare.go b/mediaapi/storage/sqlite3/prepare.go
new file mode 100644
index 00000000..a6bc24c9
--- /dev/null
+++ b/mediaapi/storage/sqlite3/prepare.go
@@ -0,0 +1,38 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// FIXME: This should be made common!
+
+package sqlite3
+
+import (
+	"database/sql"
+)
+
+// a statementList is a list of SQL statements to prepare and a pointer to where to store the resulting prepared statement.
+type statementList []struct {
+	statement **sql.Stmt
+	sql       string
+}
+
+// prepare the SQL for each statement in the list and assign the result to the prepared statement.
+func (s statementList) prepare(db *sql.DB) (err error) {
+	for _, statement := range s {
+		if *statement.statement, err = db.Prepare(statement.sql); err != nil {
+			return
+		}
+	}
+	return
+}
diff --git a/mediaapi/storage/sqlite3/sql.go b/mediaapi/storage/sqlite3/sql.go
new file mode 100644
index 00000000..9cd78b8e
--- /dev/null
+++ b/mediaapi/storage/sqlite3/sql.go
@@ -0,0 +1,36 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"database/sql"
+)
+
+type statements struct {
+	media     mediaStatements
+	thumbnail thumbnailStatements
+}
+
+func (s *statements) prepare(db *sql.DB) (err error) {
+	if err = s.media.prepare(db); err != nil {
+		return
+	}
+	if err = s.thumbnail.prepare(db); err != nil {
+		return
+	}
+
+	return
+}
diff --git a/mediaapi/storage/sqlite3/storage.go b/mediaapi/storage/sqlite3/storage.go
new file mode 100644
index 00000000..6477f830
--- /dev/null
+++ b/mediaapi/storage/sqlite3/storage.go
@@ -0,0 +1,106 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+
+	// Import the postgres database driver.
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// Database is used to store metadata about a repository of media files.
+type Database struct {
+	statements statements
+	db         *sql.DB
+}
+
+// Open opens a postgres database.
+func Open(dataSourceName string) (*Database, error) {
+	var d Database
+	var err error
+	if d.db, err = sql.Open("sqlite3", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = d.statements.prepare(d.db); err != nil {
+		return nil, err
+	}
+	return &d, nil
+}
+
+// StoreMediaMetadata inserts the metadata about the uploaded media into the database.
+// Returns an error if the combination of MediaID and Origin are not unique in the table.
+func (d *Database) StoreMediaMetadata(
+	ctx context.Context, mediaMetadata *types.MediaMetadata,
+) error {
+	return d.statements.media.insertMedia(ctx, mediaMetadata)
+}
+
+// GetMediaMetadata returns metadata about media stored on this server.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there is no metadata associated with this media.
+func (d *Database) GetMediaMetadata(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) (*types.MediaMetadata, error) {
+	mediaMetadata, err := d.statements.media.selectMedia(ctx, mediaID, mediaOrigin)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return mediaMetadata, err
+}
+
+// StoreThumbnail inserts the metadata about the thumbnail into the database.
+// Returns an error if the combination of MediaID and Origin are not unique in the table.
+func (d *Database) StoreThumbnail(
+	ctx context.Context, thumbnailMetadata *types.ThumbnailMetadata,
+) error {
+	return d.statements.thumbnail.insertThumbnail(ctx, thumbnailMetadata)
+}
+
+// GetThumbnail returns metadata about a specific thumbnail.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there is no metadata associated with this thumbnail.
+func (d *Database) GetThumbnail(
+	ctx context.Context,
+	mediaID types.MediaID,
+	mediaOrigin gomatrixserverlib.ServerName,
+	width, height int,
+	resizeMethod string,
+) (*types.ThumbnailMetadata, error) {
+	thumbnailMetadata, err := d.statements.thumbnail.selectThumbnail(
+		ctx, mediaID, mediaOrigin, width, height, resizeMethod,
+	)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnailMetadata, err
+}
+
+// GetThumbnails returns metadata about all thumbnails for a specific media stored on this server.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there are no thumbnails associated with this media.
+func (d *Database) GetThumbnails(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) ([]*types.ThumbnailMetadata, error) {
+	thumbnails, err := d.statements.thumbnail.selectThumbnails(ctx, mediaID, mediaOrigin)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnails, err
+}
diff --git a/mediaapi/storage/sqlite3/thumbnail_table.go b/mediaapi/storage/sqlite3/thumbnail_table.go
new file mode 100644
index 00000000..95332c9d
--- /dev/null
+++ b/mediaapi/storage/sqlite3/thumbnail_table.go
@@ -0,0 +1,162 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const thumbnailSchema = `
+-- The mediaapi_thumbnail table holds metadata for each thumbnail file stored and accessible to the local server,
+-- the actual file is stored separately.
+CREATE TABLE IF NOT EXISTS mediaapi_thumbnail (
+    media_id TEXT NOT NULL,
+    media_origin TEXT NOT NULL,
+    content_type TEXT NOT NULL,
+    file_size_bytes INTEGER NOT NULL,
+    creation_ts INTEGER NOT NULL,
+    width INTEGER NOT NULL,
+    height INTEGER NOT NULL,
+    resize_method TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS mediaapi_thumbnail_index ON mediaapi_thumbnail (media_id, media_origin, width, height, resize_method);
+`
+
+const insertThumbnailSQL = `
+INSERT INTO mediaapi_thumbnail (media_id, media_origin, content_type, file_size_bytes, creation_ts, width, height, resize_method)
+    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+`
+
+// Note: this selects one specific thumbnail
+const selectThumbnailSQL = `
+SELECT content_type, file_size_bytes, creation_ts FROM mediaapi_thumbnail WHERE media_id = $1 AND media_origin = $2 AND width = $3 AND height = $4 AND resize_method = $5
+`
+
+// Note: this selects all thumbnails for a media_origin and media_id
+const selectThumbnailsSQL = `
+SELECT content_type, file_size_bytes, creation_ts, width, height, resize_method FROM mediaapi_thumbnail WHERE media_id = $1 AND media_origin = $2
+`
+
+type thumbnailStatements struct {
+	insertThumbnailStmt  *sql.Stmt
+	selectThumbnailStmt  *sql.Stmt
+	selectThumbnailsStmt *sql.Stmt
+}
+
+func (s *thumbnailStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(thumbnailSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertThumbnailStmt, insertThumbnailSQL},
+		{&s.selectThumbnailStmt, selectThumbnailSQL},
+		{&s.selectThumbnailsStmt, selectThumbnailsSQL},
+	}.prepare(db)
+}
+
+func (s *thumbnailStatements) insertThumbnail(
+	ctx context.Context, thumbnailMetadata *types.ThumbnailMetadata,
+) error {
+	thumbnailMetadata.MediaMetadata.CreationTimestamp = types.UnixMs(time.Now().UnixNano() / 1000000)
+	_, err := s.insertThumbnailStmt.ExecContext(
+		ctx,
+		thumbnailMetadata.MediaMetadata.MediaID,
+		thumbnailMetadata.MediaMetadata.Origin,
+		thumbnailMetadata.MediaMetadata.ContentType,
+		thumbnailMetadata.MediaMetadata.FileSizeBytes,
+		thumbnailMetadata.MediaMetadata.CreationTimestamp,
+		thumbnailMetadata.ThumbnailSize.Width,
+		thumbnailMetadata.ThumbnailSize.Height,
+		thumbnailMetadata.ThumbnailSize.ResizeMethod,
+	)
+	return err
+}
+
+func (s *thumbnailStatements) selectThumbnail(
+	ctx context.Context,
+	mediaID types.MediaID,
+	mediaOrigin gomatrixserverlib.ServerName,
+	width, height int,
+	resizeMethod string,
+) (*types.ThumbnailMetadata, error) {
+	thumbnailMetadata := types.ThumbnailMetadata{
+		MediaMetadata: &types.MediaMetadata{
+			MediaID: mediaID,
+			Origin:  mediaOrigin,
+		},
+		ThumbnailSize: types.ThumbnailSize{
+			Width:        width,
+			Height:       height,
+			ResizeMethod: resizeMethod,
+		},
+	}
+	err := s.selectThumbnailStmt.QueryRowContext(
+		ctx,
+		thumbnailMetadata.MediaMetadata.MediaID,
+		thumbnailMetadata.MediaMetadata.Origin,
+		thumbnailMetadata.ThumbnailSize.Width,
+		thumbnailMetadata.ThumbnailSize.Height,
+		thumbnailMetadata.ThumbnailSize.ResizeMethod,
+	).Scan(
+		&thumbnailMetadata.MediaMetadata.ContentType,
+		&thumbnailMetadata.MediaMetadata.FileSizeBytes,
+		&thumbnailMetadata.MediaMetadata.CreationTimestamp,
+	)
+	return &thumbnailMetadata, err
+}
+
+func (s *thumbnailStatements) selectThumbnails(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) ([]*types.ThumbnailMetadata, error) {
+	rows, err := s.selectThumbnailsStmt.QueryContext(
+		ctx, mediaID, mediaOrigin,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	var thumbnails []*types.ThumbnailMetadata
+	for rows.Next() {
+		thumbnailMetadata := types.ThumbnailMetadata{
+			MediaMetadata: &types.MediaMetadata{
+				MediaID: mediaID,
+				Origin:  mediaOrigin,
+			},
+		}
+		err = rows.Scan(
+			&thumbnailMetadata.MediaMetadata.ContentType,
+			&thumbnailMetadata.MediaMetadata.FileSizeBytes,
+			&thumbnailMetadata.MediaMetadata.CreationTimestamp,
+			&thumbnailMetadata.ThumbnailSize.Width,
+			&thumbnailMetadata.ThumbnailSize.Height,
+			&thumbnailMetadata.ThumbnailSize.ResizeMethod,
+		)
+		if err != nil {
+			return nil, err
+		}
+		thumbnails = append(thumbnails, &thumbnailMetadata)
+	}
+
+	return thumbnails, rows.Err()
+}
diff --git a/mediaapi/storage/storage.go b/mediaapi/storage/storage.go
index 2c7f937d..1d35a95e 100644
--- a/mediaapi/storage/storage.go
+++ b/mediaapi/storage/storage.go
@@ -19,6 +19,7 @@ import (
 	"net/url"
 
 	"github.com/matrix-org/dendrite/mediaapi/storage/postgres"
+	"github.com/matrix-org/dendrite/mediaapi/storage/sqlite3"
 	"github.com/matrix-org/dendrite/mediaapi/types"
 	"github.com/matrix-org/gomatrixserverlib"
 )
@@ -40,6 +41,8 @@ func Open(dataSourceName string) (Database, error) {
 	switch uri.Scheme {
 	case "postgres":
 		return postgres.Open(dataSourceName)
+	case "file":
+		return sqlite3.Open(dataSourceName)
 	default:
 		return postgres.Open(dataSourceName)
 	}