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options.go
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options.go
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// Copyright 2015-present, Cyrill @ Schumacher.fm and the CoreStore contributors
//
// 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.
package backendcors
import (
"regexp"
"github.com/corestoreio/errors"
"github.com/corestoreio/pkg/config"
"github.com/corestoreio/pkg/net/cors"
)
// PrepareOptionFactory creates a closure around the type Backend. The closure
// will be used during a scoped request to figure out the configuration
// depending on the incoming scope. An option array will be returned by the
// closure.
func (be *Configuration) PrepareOptionFactory() cors.OptionFactoryFunc {
return func(sg config.Scoped) []cors.Option {
var (
opts [2]cors.Option
settings cors.Settings
err error
)
// EXPOSED HEADERS
settings.ExposedHeaders, err = be.ExposedHeaders.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsExposedHeaders.Get"))
}
// ALLOWED ORIGINS
settings.AllowedOrigins, err = be.AllowedOrigins.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsAllowedOrigins.Get"))
}
// ALLOW ORIGIN REGEX
aor, err := be.AllowOriginRegex.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsAllowedOriginRegex.Get"))
}
if len(aor) > 1 {
r, err := regexp.Compile(aor)
if err != nil {
return cors.OptionsError(errors.NewFatalf("[backendcors] NetCorsAllowedOriginRegex.regexp.Compile: %s", err))
}
settings.AllowOriginFunc = func(o string) bool {
return r.MatchString(o)
}
}
// ALLOWED METHODS
settings.AllowedMethods, err = be.AllowedMethods.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsAllowedMethods.Get"))
}
// ALLOWED HEADERS
settings.AllowedHeaders, err = be.AllowedHeaders.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsAllowedHeaders.Get"))
}
// ALLOW CREDENTIALS
settings.AllowCredentials, err = be.AllowCredentials.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsAllowCredentials.Get"))
}
// OPTIONS PASSTHROUGH
settings.OptionsPassthrough, err = be.OptionsPassthrough.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsOptionsPassthrough.Get"))
}
// MAX AGE
settings.MaxAge, err = be.MaxAge.Get(sg)
if err != nil {
return cors.OptionsError(errors.Wrap(err, "[backendcors] NetCorsMaxAge.Get"))
}
// in case someone marks the config as partially applied now it's time to revert
// it.
opts[0] = cors.WithMarkPartiallyApplied(false, sg.ScopeIDs()...)
opts[1] = cors.WithSettings(settings, sg.ScopeIDs()...)
return opts[:]
}
}