make mimetype allow list configurable and add example config

storage/pkg/command/gateway.go

@@ -9,6 +9,7 @@ import (
 	"path"
 	"strings"
 
+	"github.com/mitchellh/mapstructure"
 	"github.com/owncloud/ocis/storage/pkg/tracing"
 
 	"github.com/owncloud/ocis/ocis-pkg/sync"
@@ -167,6 +168,11 @@ func gatewayConfigFromStruct(c *cli.Context, cfg *config.Config, logger log.Logg
 				},
 				"appregistry": map[string]interface{}{
 					"driver": "static",
+					"drivers": map[string]interface{}{
+						"static": map[string]interface{}{
+							"mime_types": mimetypes(cfg, logger),
+						},
+					},
 				},
 				"storageregistry": map[string]interface{}{
 					"driver": cfg.Reva.StorageRegistry.Driver,
@@ -222,6 +228,118 @@ func rules(cfg *config.Config, logger log.Logger) map[string]map[string]interfac
 	}
 }
 
+func mimetypes(cfg *config.Config, logger log.Logger) (m map[string]map[string]string) {
+
+	type mimeTypeConfig struct {
+		Extension   string `json:"extension" mapstructure:"extension"`
+		Name        string `json:"name" mapstructure:"name"`
+		Description string `json:"description" mapstructure:"description"`
+		Icon        string `json:"icon" mapstructure:"icon"`
+		DefaultApp  string `json:"default_app" mapstructure:"default_app"`
+	}
+	type mimetypesConfig map[string]mimeTypeConfig
+
+	var mimetypes mimetypesConfig
+
+	// load default app mimetypes from a json file
+	if cfg.Reva.AppRegistry.MimetypesJSON != "" {
+		data, err := ioutil.ReadFile(cfg.Reva.AppRegistry.MimetypesJSON)
+		if err != nil {
+			logger.Error().Err(err).Msg("Failed to read app registry mimetypes from JSON file: " + cfg.Reva.AppRegistry.MimetypesJSON)
+			return nil
+		}
+		if err = json.Unmarshal(data, &mimetypes); err != nil {
+			logger.Error().Err(err).Msg("Failed to unmarshal storage registry rules")
+			return nil
+		}
+		if err := mapstructure.Decode(mimetypes, &m); err != nil {
+			return nil
+		}
+		return m
+	}
+
+	logger.Info().Msg("No app registry mimetypes JSON file provided, loading default configuration")
+
+	mimetypes = map[string]mimeTypeConfig{
+		"application/pdf": {
+			Extension:   "pdf",
+			Name:        "PDF",
+			Description: "PDF document",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/vnd.oasis.opendocument.text": {
+			Extension:   "odt",
+			Name:        "OpenDocument",
+			Description: "OpenDocument text document",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/vnd.oasis.opendocument.spreadsheet": {
+			Extension:   "ods",
+			Name:        "OpenSpreadsheet",
+			Description: "OpenDocument spreadsheet document",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/vnd.oasis.opendocument.presentation": {
+			Extension:   "odp",
+			Name:        "OpenPresentation",
+			Description: "OpenDocument presentation document",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/vnd.openxmlformats-officedocument.wordprocessingml.document": {
+			Extension:   "docx",
+			Name:        "Microsoft Word",
+			Description: "Microsoft Word document",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet": {
+			Extension:   "xlsx",
+			Name:        "Microsoft Excel",
+			Description: "Microsoft Excel document",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/vnd.openxmlformats-officedocument.presentationml.presentation": {
+			Extension:   "pptx",
+			Name:        "Microsoft PowerPoint",
+			Description: "Microsoft PowerPoint document",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/vnd.jupyter": {
+			Extension:   "ipynb",
+			Name:        "Jupyter Notebook",
+			Description: "Jupyter Notebook",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"text/markdown": {
+			Extension:   "md",
+			Name:        "Markdown file",
+			Description: "Markdown file",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+		"application/compressed-markdown": {
+			Extension:   "zmd",
+			Name:        "Compressed markdown file",
+			Description: "Compressed markdown file",
+			Icon:        "",
+			DefaultApp:  "",
+		},
+	}
+
+	if err := mapstructure.Decode(mimetypes, &m); err != nil {
+		return nil
+	}
+	return m
+
+}
+
 // GatewaySutureService allows for the storage-gateway command to be embedded and supervised by a suture supervisor tree.
 type GatewaySutureService struct {
 	cfg *config.Config