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| 1 | +package wasm |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "encoding/json" |
| 6 | + "fmt" |
| 7 | + "runtime" |
| 8 | + "strings" |
| 9 | + |
| 10 | + ocispec "github.com/opencontainers/image-spec/specs-go/v1" |
| 11 | + "oras.land/oras-go/v2/content" |
| 12 | + "oras.land/oras-go/v2/registry/remote" |
| 13 | + "oras.land/oras-go/v2/registry/remote/auth" |
| 14 | + "oras.land/oras-go/v2/registry/remote/credentials" |
| 15 | + "oras.land/oras-go/v2/registry/remote/retry" |
| 16 | + |
| 17 | + "github.com/sqlc-dev/sqlc/internal/info" |
| 18 | +) |
| 19 | + |
| 20 | +const ( |
| 21 | + wasmLayerMediaType = "application/wasm" |
| 22 | + wasmConfigMediaType = "application/vnd.wasm.config.v0+json" |
| 23 | +) |
| 24 | + |
| 25 | +type wasmConfig struct { |
| 26 | + Architecture string `json:"architecture"` |
| 27 | + OS string `json:"os"` |
| 28 | + LayerDigests []string `json:"layerDigests"` |
| 29 | +} |
| 30 | + |
| 31 | +func fetchOCI(ctx context.Context, uri string, plainHTTP bool) ([]byte, error) { |
| 32 | + reference := strings.TrimPrefix(uri, "oci://") |
| 33 | + repo, err := remote.NewRepository(reference) |
| 34 | + if err != nil { |
| 35 | + return nil, fmt.Errorf("parse OCI reference %q: %w", uri, err) |
| 36 | + } |
| 37 | + repo.PlainHTTP = plainHTTP |
| 38 | + |
| 39 | + store, err := credentials.NewStoreFromDocker(credentials.StoreOptions{}) |
| 40 | + if err != nil { |
| 41 | + return nil, fmt.Errorf("load Docker credentials: %w", err) |
| 42 | + } |
| 43 | + client := &auth.Client{ |
| 44 | + Client: retry.DefaultClient, |
| 45 | + Cache: auth.NewCache(), |
| 46 | + Credential: credentials.Credential(store), |
| 47 | + } |
| 48 | + client.SetUserAgent(fmt.Sprintf("sqlc/%s Go/%s (%s %s)", info.Version, runtime.Version(), runtime.GOOS, runtime.GOARCH)) |
| 49 | + repo.Client = client |
| 50 | + |
| 51 | + desc, manifestReader, err := repo.FetchReference(ctx, repo.Reference.Reference) |
| 52 | + if err != nil { |
| 53 | + return nil, fmt.Errorf("fetch OCI manifest %q: %w", uri, err) |
| 54 | + } |
| 55 | + defer manifestReader.Close() |
| 56 | + if desc.MediaType != ocispec.MediaTypeImageManifest { |
| 57 | + return nil, fmt.Errorf("OCI reference %q resolved to unsupported media type %q", uri, desc.MediaType) |
| 58 | + } |
| 59 | + manifestData, err := content.ReadAll(manifestReader, desc) |
| 60 | + if err != nil { |
| 61 | + return nil, fmt.Errorf("read OCI manifest %q: %w", uri, err) |
| 62 | + } |
| 63 | + var manifest ocispec.Manifest |
| 64 | + if err := json.Unmarshal(manifestData, &manifest); err != nil { |
| 65 | + return nil, fmt.Errorf("decode OCI manifest %q: %w", uri, err) |
| 66 | + } |
| 67 | + if manifest.SchemaVersion != 2 { |
| 68 | + return nil, fmt.Errorf("OCI artifact %q: unsupported schema version %d", uri, manifest.SchemaVersion) |
| 69 | + } |
| 70 | + layer, err := wasmLayer(manifest.Layers) |
| 71 | + if err != nil { |
| 72 | + return nil, fmt.Errorf("OCI artifact %q: %w", uri, err) |
| 73 | + } |
| 74 | + if manifest.Config.MediaType != wasmConfigMediaType { |
| 75 | + return nil, fmt.Errorf("OCI artifact %q: unsupported config media type %q", uri, manifest.Config.MediaType) |
| 76 | + } |
| 77 | + configData, err := content.FetchAll(ctx, repo, manifest.Config) |
| 78 | + if err != nil { |
| 79 | + return nil, fmt.Errorf("fetch OCI WASM config %q: %w", uri, err) |
| 80 | + } |
| 81 | + if err := validateWASMConfig(configData, layer); err != nil { |
| 82 | + return nil, fmt.Errorf("OCI artifact %q: %w", uri, err) |
| 83 | + } |
| 84 | + |
| 85 | + body, err := repo.Fetch(ctx, layer) |
| 86 | + if err != nil { |
| 87 | + return nil, fmt.Errorf("fetch OCI WASM layer %q: %w", uri, err) |
| 88 | + } |
| 89 | + defer body.Close() |
| 90 | + wmod, err := content.ReadAll(body, layer) |
| 91 | + if err != nil { |
| 92 | + return nil, fmt.Errorf("read OCI WASM layer %q: %w", uri, err) |
| 93 | + } |
| 94 | + return wmod, nil |
| 95 | +} |
| 96 | + |
| 97 | +func wasmLayer(layers []ocispec.Descriptor) (ocispec.Descriptor, error) { |
| 98 | + if len(layers) != 1 { |
| 99 | + return ocispec.Descriptor{}, fmt.Errorf("manifest must contain exactly one WASM layer") |
| 100 | + } |
| 101 | + if layers[0].MediaType != wasmLayerMediaType { |
| 102 | + return ocispec.Descriptor{}, fmt.Errorf("unsupported WASM layer media type %q", layers[0].MediaType) |
| 103 | + } |
| 104 | + return layers[0], nil |
| 105 | +} |
| 106 | + |
| 107 | +func validateWASMConfig(data []byte, layer ocispec.Descriptor) error { |
| 108 | + var config wasmConfig |
| 109 | + if err := json.Unmarshal(data, &config); err != nil { |
| 110 | + return fmt.Errorf("decode WASM config: %w", err) |
| 111 | + } |
| 112 | + if config.Architecture != "wasm" { |
| 113 | + return fmt.Errorf("unsupported WASM architecture %q", config.Architecture) |
| 114 | + } |
| 115 | + if config.OS != "wasip1" { |
| 116 | + return fmt.Errorf("unsupported WASM OS %q: only wasip1 plugins are supported", config.OS) |
| 117 | + } |
| 118 | + if len(config.LayerDigests) != 1 || config.LayerDigests[0] != layer.Digest.String() { |
| 119 | + return fmt.Errorf("WASM config layerDigests must match the manifest layers") |
| 120 | + } |
| 121 | + return nil |
| 122 | +} |
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