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import ( "context" "crypto" "crypto/rand" "crypto/rsa" "crypto/sha256" "encoding/base64" "encoding/json" "fmt" "io" "mime" "net/http" "strings"
"stream.place/streamplace/js/app" "stream.place/streamplace/pkg/config" "stream.place/streamplace/pkg/log"
"github.com/dunglas/httpsfv")
const IOS = "ios"const ANDROID = "android"
type UpdateManifest struct { ID string `json:"id"` CreatedAt string `json:"createdAt"` RuntimeVersion string `json:"runtimeVersion"` LaunchAsset UpdateAsset `json:"launchAsset"` Assets []UpdateAsset `json:"assets"` Metadata map[string]string `json:"metadata"` Extra map[string]any `json:"extra"`}
type UpdateAsset struct { Hash string `json:"hash,omitempty"` Key string `json:"key"` ContentType string `json:"contentType"` FileExtension string `json:"fileExtension,omitempty"` URL string `json:"url"` Path string `json:"-"`}
type ExpoMetadata struct { Version int `json:"version"` Bundler string `json:"bundler"` FileMetadata struct { IOS ExpoMetadataPlatform `json:"ios"` Android ExpoMetadataPlatform `json:"android"` } `json:"fileMetadata"`}
type ExpoMetadataPlatform struct { Bundle string `json:"bundle"` Assets []struct { Path string `json:"path"` Ext string `json:"ext"` } `json:"assets"`}
type Updater struct { Metadata ExpoMetadata Extra map[string]any CLI *config.CLI SigningKey *rsa.PrivateKey RuntimeVersion string}
func (u *Updater) GetManifest(platform, runtime, prefix string) (*UpdateManifest, error) { var plat ExpoMetadataPlatform if platform == IOS { plat = u.Metadata.FileMetadata.IOS } else if platform == ANDROID { plat = u.Metadata.FileMetadata.Android } else { return nil, fmt.Errorf("unknown platform: %s", platform) } if plat.Bundle == "" { // No native bundle means this frontend was exported without one // (`expo export --platform web`), which leaves metadata.json with an // empty fileMetadata. There is nothing to serve an update from. return nil, fmt.Errorf("expo OTA update not found for %s: metadata.json has no %s bundle, did you run `make app`?", platform, platform) } assets := []UpdateAsset{} for _, ass := range plat.Assets { ext := fmt.Sprintf(".%s", ass.Ext) loadEmbeddedMimes() typ := mime.TypeByExtension(ext)
if typ == "" { return nil, fmt.Errorf("unknown content-type for file extention %s", ext) } parts := strings.Split(ass.Path, "/") hash, err := hashFile(ass.Path) if err != nil { return nil, err } assets = append(assets, UpdateAsset{ Hash: hash, Key: parts[len(parts)-1], Path: ass.Path, URL: fmt.Sprintf("%s/%s", prefix, ass.Path), ContentType: typ, FileExtension: ass.Ext, }) } dashParts := strings.Split(plat.Bundle, "-") dotParts := strings.Split(dashParts[len(dashParts)-1], ".") hash, err := hashFile(plat.Bundle) if err != nil { return nil, err } man := UpdateManifest{ ID: u.CLI.Build.UUID, CreatedAt: u.CLI.Build.BuildTimeStrExpo(), RuntimeVersion: runtime, LaunchAsset: UpdateAsset{ Hash: hash, Key: dotParts[0], Path: plat.Bundle, URL: fmt.Sprintf("%s/%s", prefix, plat.Bundle), ContentType: "application/javascript", }, Assets: assets, Metadata: map[string]string{}, Extra: u.Extra, } return &man, nil}
var DefaultKey = "main"
// get keyid, with a default if there's not onefunc getKeyID(header string) string { d, err := httpsfv.UnmarshalDictionary([]string{header}) if err != nil { return DefaultKey } key, ok := d.Get("keyid") if !ok { return DefaultKey } keystr, ok := key.(httpsfv.Item).Value.(string) if !ok { return DefaultKey } return keystr}
func (u *Updater) GetManifestBytes(platform, runtime, signing, prefix string) ([]byte, string, error) { if runtime != u.RuntimeVersion { return nil, "", fmt.Errorf("runtime version mismatch client=%s server=%s", runtime, u.RuntimeVersion) } manifest, err := u.GetManifest(platform, runtime, prefix) if err != nil { return nil, "", err } bs, err := json.Marshal(manifest) if err != nil { return nil, "", err } var header string if u.SigningKey != nil { keyid := getKeyID(signing) msgHash := sha256.New() _, err = msgHash.Write(bs) if err != nil { return nil, "", fmt.Errorf("error getting sha256 hash of manifest: %w", err) } msgHashSum := msgHash.Sum(nil) signature, err := rsa.SignPKCS1v15(rand.Reader, u.SigningKey, crypto.SHA256, msgHashSum) if err != nil { return nil, "", fmt.Errorf("error signing manifest: %w", err) } sigString := base64.StdEncoding.EncodeToString(signature) dict := httpsfv.NewDictionary() dict.Add("sig", httpsfv.NewItem(sigString)) dict.Add("keyid", httpsfv.NewItem(keyid)) header, err = httpsfv.Marshal(dict) if err != nil { return nil, "", fmt.Errorf("error marshalling dict: %w", err) } } return bs, header, nil}
// get MIME types of built-in update filesfunc (u *Updater) GetMimes() (map[string]string, error) { assets := []UpdateAsset{} ios, err := u.GetManifest(IOS, "", "") if err != nil { return nil, err } assets = append(assets, ios.LaunchAsset) assets = append(assets, ios.Assets...) android, err := u.GetManifest(ANDROID, "", "") if err != nil { return nil, err } assets = append(assets, android.LaunchAsset) assets = append(assets, android.Assets...) m := map[string]string{} for _, ass := range assets { if ass.Path == "" { return nil, fmt.Errorf("asset has no path! asset=%v", ass) } m[ass.Path] = ass.ContentType } return m, nil}
func PrepareUpdater(cli *config.CLI) (*Updater, error) { fs, err := app.Files() if err != nil { return nil, err } file, err := fs.Open("metadata.json") if err != nil { return nil, fmt.Errorf("couldn't read metadata.json, did you run `make app`? error=%w", err) } bs, err := io.ReadAll(file) if err != nil { return nil, err } metadata := ExpoMetadata{} err = json.Unmarshal(bs, &metadata) if err != nil { return nil, err }
extra, err := app.PackageJSON() if err != nil { return nil, fmt.Errorf("package.json failed") }
rt, ok := extra["runtimeVersion"] if !ok { return nil, fmt.Errorf("package.json missing runtimeVersion") } runtimeVersion, ok := rt.(string) if !ok { return nil, fmt.Errorf("package.json has runtimeVersion that's not a string") }
expoConfig, err := fs.Open("expoConfig.json") if err != nil { return nil, fmt.Errorf("couldn't open expoConfig.json: %w", err) } expoConfigBytes, err := io.ReadAll(expoConfig) if err != nil { return nil, fmt.Errorf("couldn't read expoConfig.json: %w", err) } expoConfigJSON := map[string]any{} err = json.Unmarshal(expoConfigBytes, &expoConfigJSON) if err != nil { return nil, fmt.Errorf("couldn't parse expoConfig.json: %w", err) } extra["expoClient"] = expoConfigJSON
var privateKey *rsa.PrivateKey if cli.SigningKeyPath != "" { privateKey, err = cli.ParseSigningKey() if err != nil { return nil, err } }
return &Updater{ CLI: cli, Metadata: metadata, Extra: extra, SigningKey: privateKey, RuntimeVersion: runtimeVersion, }, nil}
func (a *StreamplaceAPI) HandleAppUpdates(ctx context.Context) http.HandlerFunc { return func(w http.ResponseWriter, req *http.Request) { proto := "http" if req.TLS != nil { proto = "https" } if xfproto := req.Header.Get("x-forwarded-proto"); xfproto == "https" { proto = "https" } prefix := fmt.Sprintf("%s://%s", proto, req.Host) log.Log(ctx, "got app-updates request", "method", req.Method, "headers", req.Header) plat := req.Header.Get("expo-platform") if plat == "" { log.Log(ctx, "app-updates request missing Expo-Platform") w.WriteHeader(400) return } runtime := req.Header.Get("expo-runtime-version") if runtime == "" { log.Log(ctx, "app-updates request missing Expo-Runtime-Version") w.WriteHeader(400) return } signing := req.Header.Get("expo-expect-signature") if signing != "" { if a.Updater.SigningKey == nil { log.Log(ctx, "signing requested but we don't have a key", "expo-expect-signature", signing) w.WriteHeader(501) return } } bs, header, err := a.Updater.GetManifestBytes(plat, runtime, signing, prefix) if err != nil { log.Log(ctx, "app-updates request errored getting manfiest", "error", err) w.WriteHeader(400) return } if signing != "" { w.Header().Set("expo-signature", header) } w.Header().Set("content-type", "application/json") w.Header().Set("expo-protocol-version", "1") w.Header().Set("expo-sfv-version", "0") w.WriteHeader(http.StatusOK) if _, err := w.Write(bs); err != nil { log.Error(ctx, "error writing response", "error", err) } }}
func hashFile(path string) (string, error) { fs, err := app.Files() if err != nil { return "", err } file, err := fs.Open(path) if err != nil { return "", err } bs, err := io.ReadAll(file) if err != nil { return "", err } h := sha256.New()
h.Write(bs)
outbs := h.Sum(nil)
sEnc := base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(outbs) return sEnc, nil}