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cors.go
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cors.go
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// Copyright 2018-2022 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package cors
import (
"net/http"
"github.com/cs3org/reva/pkg/rhttp/global"
"github.com/mitchellh/mapstructure"
"github.com/rs/cors"
)
const (
defaultPriority = 200
)
func init() {
global.RegisterMiddleware("cors", New)
}
type config struct {
AllowCredentials bool `mapstructure:"allow_credentials"`
OptionsPassthrough bool `mapstructure:"options_passthrough"`
Debug bool `mapstructure:"debug"`
MaxAge int `mapstructure:"max_age"`
Priority int `mapstructure:"priority"`
AllowedMethods []string `mapstructure:"allowed_methods"`
AllowedHeaders []string `mapstructure:"allowed_headers"`
ExposedHeaders []string `mapstructure:"exposed_headers"`
AllowedOrigins []string `mapstructure:"allowed_origins"`
}
// New creates a new CORS middleware.
func New(m map[string]interface{}) (global.Middleware, int, error) {
conf := &config{}
if err := mapstructure.Decode(m, conf); err != nil {
return nil, 0, err
}
if conf.Priority == 0 {
conf.Priority = defaultPriority
}
// apply some defaults to reduce configuration boilerplate
if len(conf.AllowedOrigins) == 0 {
conf.AllowedOrigins = []string{"*"}
}
if len(conf.AllowedMethods) == 0 {
conf.AllowedMethods = []string{
http.MethodOptions,
http.MethodHead,
http.MethodGet,
http.MethodPut,
http.MethodPost,
"DELETE",
"MKCOL",
"PROPFIND",
"PROPPATCH",
"MOVE",
"COPY",
"REPORT",
"SEARCH",
}
}
if len(conf.AllowedHeaders) == 0 {
conf.AllowedHeaders = []string{
"Origin",
"Accept",
"Content-Type",
"Depth",
"Authorization",
"Ocs-Apirequest",
"If-None-Match",
"If-Match",
"Destination",
"Overwrite",
"X-Request-Id",
"X-Requested-With",
"Tus-Resumable",
"Tus-Checksum-Algorithm",
"Upload-Concat",
"Upload-Length",
"Upload-Metadata",
"Upload-Defer-Length",
"Upload-Expires",
"Upload-Checksum",
"Upload-Offset",
"X-HTTP-Method-Override",
}
}
if len(conf.ExposedHeaders) == 0 {
conf.ExposedHeaders = []string{
"Location",
}
}
// TODO(jfd): use log from request context, otherwise fmt will be used to log,
// preventing us from pinging the log to eg jq
c := cors.New(cors.Options{
AllowCredentials: conf.AllowCredentials,
AllowedHeaders: conf.AllowedHeaders,
AllowedMethods: conf.AllowedMethods,
AllowedOrigins: conf.AllowedOrigins,
ExposedHeaders: conf.ExposedHeaders,
MaxAge: conf.MaxAge,
OptionsPassthrough: conf.OptionsPassthrough,
Debug: conf.Debug,
})
return c.Handler, conf.Priority, nil
}