| 1 | // SPDX-License-Identifier: AGPL-3.0-or-later |
| 2 | |
| 3 | package storage |
| 4 | |
| 5 | import ( |
| 6 | "bytes" |
| 7 | "context" |
| 8 | "crypto/md5" //nolint:gosec // ETag, not security-sensitive — matches S3 etag derivation. |
| 9 | "encoding/hex" |
| 10 | "fmt" |
| 11 | "io" |
| 12 | "sort" |
| 13 | "strings" |
| 14 | "sync" |
| 15 | "time" |
| 16 | ) |
| 17 | |
| 18 | // MemoryStore is an in-process ObjectStore implementation. Used by tests. |
| 19 | // Honors the same If-None-Match semantics as the s3 backend. |
| 20 | type MemoryStore struct { |
| 21 | mu sync.RWMutex |
| 22 | objects map[string]memObject |
| 23 | // signedURLBase is the prefix of generated SignedURLs so tests can |
| 24 | // assert their shape. Defaults to "mem://". |
| 25 | signedURLBase string |
| 26 | } |
| 27 | |
| 28 | type memObject struct { |
| 29 | body []byte |
| 30 | etag string |
| 31 | contentType string |
| 32 | lastModified time.Time |
| 33 | } |
| 34 | |
| 35 | // NewMemoryStore constructs an empty in-memory store. |
| 36 | func NewMemoryStore() *MemoryStore { |
| 37 | return &MemoryStore{ |
| 38 | objects: make(map[string]memObject), |
| 39 | signedURLBase: "mem://", |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | // Put implements ObjectStore. |
| 44 | func (m *MemoryStore) Put(_ context.Context, key string, body io.Reader, opts PutOpts) (PutResult, error) { |
| 45 | if key == "" { |
| 46 | return PutResult{}, fmt.Errorf("storage: put: %w: empty key", ErrInvalidPath) |
| 47 | } |
| 48 | buf, err := io.ReadAll(body) |
| 49 | if err != nil { |
| 50 | return PutResult{}, fmt.Errorf("storage: put: read body: %w", err) |
| 51 | } |
| 52 | m.mu.Lock() |
| 53 | defer m.mu.Unlock() |
| 54 | if opts.IfNoneMatch == "*" { |
| 55 | if _, exists := m.objects[key]; exists { |
| 56 | return PutResult{}, ErrPreconditionFailed |
| 57 | } |
| 58 | } |
| 59 | sum := md5.Sum(buf) //nolint:gosec // not security-sensitive. |
| 60 | etag := hex.EncodeToString(sum[:]) |
| 61 | m.objects[key] = memObject{ |
| 62 | body: buf, |
| 63 | etag: etag, |
| 64 | contentType: opts.ContentType, |
| 65 | lastModified: time.Now().UTC(), |
| 66 | } |
| 67 | return PutResult{ETag: etag, Size: int64(len(buf))}, nil |
| 68 | } |
| 69 | |
| 70 | // Get implements ObjectStore. |
| 71 | func (m *MemoryStore) Get(_ context.Context, key string) (io.ReadCloser, ObjectMeta, error) { |
| 72 | m.mu.RLock() |
| 73 | defer m.mu.RUnlock() |
| 74 | o, ok := m.objects[key] |
| 75 | if !ok { |
| 76 | return nil, ObjectMeta{}, ErrNotFound |
| 77 | } |
| 78 | return io.NopCloser(bytes.NewReader(o.body)), m.metaOf(key, o), nil |
| 79 | } |
| 80 | |
| 81 | // Stat implements ObjectStore. |
| 82 | func (m *MemoryStore) Stat(_ context.Context, key string) (ObjectMeta, error) { |
| 83 | m.mu.RLock() |
| 84 | defer m.mu.RUnlock() |
| 85 | o, ok := m.objects[key] |
| 86 | if !ok { |
| 87 | return ObjectMeta{}, ErrNotFound |
| 88 | } |
| 89 | return m.metaOf(key, o), nil |
| 90 | } |
| 91 | |
| 92 | // Delete implements ObjectStore. Idempotent. |
| 93 | func (m *MemoryStore) Delete(_ context.Context, key string) error { |
| 94 | m.mu.Lock() |
| 95 | defer m.mu.Unlock() |
| 96 | delete(m.objects, key) |
| 97 | return nil |
| 98 | } |
| 99 | |
| 100 | // List implements ObjectStore. ContinuationToken is the last key returned |
| 101 | // in the previous page; results are sorted lexicographically. |
| 102 | func (m *MemoryStore) List(_ context.Context, prefix string, opts ListOpts) (ListResult, error) { |
| 103 | m.mu.RLock() |
| 104 | defer m.mu.RUnlock() |
| 105 | |
| 106 | keys := make([]string, 0, len(m.objects)) |
| 107 | for k := range m.objects { |
| 108 | if strings.HasPrefix(k, prefix) { |
| 109 | keys = append(keys, k) |
| 110 | } |
| 111 | } |
| 112 | sort.Strings(keys) |
| 113 | |
| 114 | if opts.ContinuationToken != "" { |
| 115 | i := sort.SearchStrings(keys, opts.ContinuationToken) |
| 116 | if i < len(keys) && keys[i] == opts.ContinuationToken { |
| 117 | i++ |
| 118 | } |
| 119 | keys = keys[i:] |
| 120 | } |
| 121 | |
| 122 | maxKeys := opts.MaxKeys |
| 123 | if maxKeys <= 0 { |
| 124 | maxKeys = 1000 |
| 125 | } |
| 126 | |
| 127 | var ( |
| 128 | out []ObjectMeta |
| 129 | prefixes []string |
| 130 | ) |
| 131 | seenPrefix := map[string]struct{}{} |
| 132 | |
| 133 | for _, k := range keys { |
| 134 | if !opts.Recursive { |
| 135 | rest := strings.TrimPrefix(k, prefix) |
| 136 | if i := strings.Index(rest, "/"); i >= 0 { |
| 137 | cp := prefix + rest[:i+1] |
| 138 | if _, ok := seenPrefix[cp]; !ok { |
| 139 | seenPrefix[cp] = struct{}{} |
| 140 | prefixes = append(prefixes, cp) |
| 141 | } |
| 142 | continue |
| 143 | } |
| 144 | } |
| 145 | o := m.objects[k] |
| 146 | out = append(out, m.metaOf(k, o)) |
| 147 | if len(out) >= maxKeys { |
| 148 | break |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | res := ListResult{Objects: out, CommonPrefixes: prefixes} |
| 153 | if len(out) >= maxKeys && len(out) > 0 { |
| 154 | res.IsTruncated = true |
| 155 | res.NextContinuationToken = out[len(out)-1].Key |
| 156 | } |
| 157 | return res, nil |
| 158 | } |
| 159 | |
| 160 | // SignedURL implements ObjectStore. Tests can rely on the prefix to |
| 161 | // distinguish memory-backed URLs from real ones. |
| 162 | func (m *MemoryStore) SignedURL(_ context.Context, key string, ttl time.Duration, method string) (string, error) { |
| 163 | switch method { |
| 164 | case "GET", "PUT": |
| 165 | default: |
| 166 | return "", fmt.Errorf("storage: signed url: unsupported method %q", method) |
| 167 | } |
| 168 | if key == "" { |
| 169 | return "", fmt.Errorf("storage: signed url: %w: empty key", ErrInvalidPath) |
| 170 | } |
| 171 | return fmt.Sprintf("%s%s?method=%s&ttl=%s", m.signedURLBase, key, method, ttl), nil |
| 172 | } |
| 173 | |
| 174 | func (m *MemoryStore) metaOf(key string, o memObject) ObjectMeta { |
| 175 | return ObjectMeta{ |
| 176 | Key: key, |
| 177 | Size: int64(len(o.body)), |
| 178 | ETag: o.etag, |
| 179 | ContentType: o.contentType, |
| 180 | LastModified: o.lastModified, |
| 181 | } |
| 182 | } |
| 183 |