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/*
GoToSocial
Copyright (C) 2021-2023 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 storage
import (
"context"
"fmt"
"mime"
"net/url"
"path"
"time"
"codeberg.org/gruf/go-bytesize"
"codeberg.org/gruf/go-cache/v3/ttl"
"codeberg.org/gruf/go-store/v2/kv"
"codeberg.org/gruf/go-store/v2/storage"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/log"
)
const (
urlCacheTTL = time.Hour * 24
urlCacheExpiryFrequency = time.Minute * 5
)
// PresignedURL represents a pre signed S3 URL with
// an expiry time.
type PresignedURL struct {
*url.URL
Expiry time.Time // link expires at this time
}
// ErrAlreadyExists is a ptr to underlying storage.ErrAlreadyExists,
// to put the related errors in the same package as our storage wrapper.
var ErrAlreadyExists = storage.ErrAlreadyExists
// Driver wraps a kv.KVStore to also provide S3 presigned GET URLs.
type Driver struct {
// Underlying storage
*kv.KVStore
Storage storage.Storage
// S3-only parameters
Proxy bool
Bucket string
PresignedCache *ttl.Cache[string, PresignedURL]
}
// URL will return a presigned GET object URL, but only if running on S3 storage with proxying disabled.
func (d *Driver) URL(ctx context.Context, key string) *PresignedURL {
// Check whether S3 *without* proxying is enabled
s3, ok := d.Storage.(*storage.S3Storage)
if !ok || d.Proxy {
return nil
}
// Check cache underlying cache map directly to
// avoid extending the TTL (which cache.Get() does).
d.PresignedCache.Lock()
e, ok := d.PresignedCache.Cache.Get(key)
d.PresignedCache.Unlock()
if ok {
return &e.Value
}
u, err := s3.Client().PresignedGetObject(ctx, d.Bucket, key, urlCacheTTL, url.Values{
"response-content-type": []string{mime.TypeByExtension(path.Ext(key))},
})
if err != nil {
// If URL request fails, fallback is to fetch the file. So ignore the error here
return nil
}
psu := PresignedURL{
URL: u,
Expiry: time.Now().Add(urlCacheTTL), // link expires in 24h time
}
d.PresignedCache.Set(key, psu)
return &psu
}
func AutoConfig() (*Driver, error) {
switch backend := config.GetStorageBackend(); backend {
case "s3":
return NewS3Storage()
case "local":
return NewFileStorage()
default:
return nil, fmt.Errorf("invalid storage backend: %s", backend)
}
}
func NewFileStorage() (*Driver, error) {
// Load runtime configuration
basePath := config.GetStorageLocalBasePath()
// Open the disk storage implementation
disk, err := storage.OpenDisk(basePath, &storage.DiskConfig{
// Put the store lockfile in the storage dir itself.
// Normally this would not be safe, since we could end up
// overwriting the lockfile if we store a file called 'store.lock'.
// However, in this case it's OK because the keys are set by
// GtS and not the user, so we know we're never going to overwrite it.
LockFile: path.Join(basePath, "store.lock"),
WriteBufSize: int(16 * bytesize.KiB),
})
if err != nil {
return nil, fmt.Errorf("error opening disk storage: %w", err)
}
// Perform an initial storage clean to delete old dirs.
if err := disk.Clean(context.Background()); err != nil {
log.Errorf(nil, "error performing storage cleanup: %v", err)
}
return &Driver{
KVStore: kv.New(disk),
Storage: disk,
}, nil
}
func NewS3Storage() (*Driver, error) {
// Load runtime configuration
endpoint := config.GetStorageS3Endpoint()
access := config.GetStorageS3AccessKey()
secret := config.GetStorageS3SecretKey()
secure := config.GetStorageS3UseSSL()
bucket := config.GetStorageS3BucketName()
// Open the s3 storage implementation
s3, err := storage.OpenS3(endpoint, bucket, &storage.S3Config{
CoreOpts: minio.Options{
Creds: credentials.NewStaticV4(access, secret, ""),
Secure: secure,
},
GetOpts: minio.GetObjectOptions{},
PutOpts: minio.PutObjectOptions{},
PutChunkSize: 5 * 1024 * 1024, // 5MiB
StatOpts: minio.StatObjectOptions{},
RemoveOpts: minio.RemoveObjectOptions{},
ListSize: 200,
})
if err != nil {
return nil, fmt.Errorf("error opening s3 storage: %w", err)
}
// ttl should be lower than the expiry used by S3 to avoid serving invalid URLs
presignedCache := ttl.New[string, PresignedURL](0, 1000, urlCacheTTL-urlCacheExpiryFrequency)
presignedCache.Start(urlCacheExpiryFrequency)
return &Driver{
KVStore: kv.New(s3),
Proxy: config.GetStorageS3Proxy(),
Bucket: config.GetStorageS3BucketName(),
Storage: s3,
PresignedCache: presignedCache,
}, nil
}
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