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cors.go
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cors.go
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/*
Copyright 2023 The Nuclio Authors.
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 cors
import (
"strconv"
"strings"
"github.com/nuclio/nuclio/pkg/common"
"github.com/nuclio/nuclio/pkg/common/headers"
"github.com/valyala/fasthttp"
)
type CORS struct {
Enabled bool
// allow configuration
AllowOrigins []string
AllowMethods []string
AllowHeaders []string
AllowCredentials bool
ExposeHeaders []string
// preflight
PreflightRequestMethod string
PreflightMaxAgeSeconds *int
// encoded
allowMethodsStr string
allowHeadersStr string
preflightMaxAgeSecondsStr string
allowCredentialsStr string
exposeHeadersStr string
}
func NewCORS() *CORS {
cors := &CORS{
Enabled: true,
AllowOrigins: []string{
"*",
},
AllowMethods: []string{
fasthttp.MethodHead,
fasthttp.MethodGet,
fasthttp.MethodPost,
fasthttp.MethodPut,
fasthttp.MethodDelete,
fasthttp.MethodOptions,
fasthttp.MethodPatch,
},
AllowHeaders: []string{
fasthttp.HeaderAccept,
fasthttp.HeaderContentLength,
fasthttp.HeaderContentType,
fasthttp.HeaderAuthorization,
// nuclio custom
headers.LogLevel,
},
ExposeHeaders: []string{},
AllowCredentials: false,
PreflightRequestMethod: fasthttp.MethodOptions,
}
cors.populatePreflightMaxAgeSeconds()
return cors
}
func (c *CORS) OriginAllowed(origin string) bool {
if origin == "" {
return false
}
// when all origins are allowed
if c.isAllowAllOrigins() {
return true
}
// check one-by-one
return common.StringSliceContainsStringCaseInsensitive(c.AllowOrigins, origin)
}
func (c *CORS) MethodAllowed(method string) bool {
return method != "" &&
(method == c.PreflightRequestMethod || common.StringSliceContainsStringCaseInsensitive(c.AllowMethods, method))
}
func (c *CORS) HeadersAllowed(headers []string) bool {
for _, header := range headers {
if !common.StringSliceContainsStringCaseInsensitive(c.AllowHeaders, header) {
return false
}
}
return true
}
func (c *CORS) EncodedAllowMethods() string {
if c.allowMethodsStr == "" {
c.allowMethodsStr = strings.Join(c.AllowMethods, ", ")
}
return c.allowMethodsStr
}
func (c *CORS) EncodeAllowHeaders() string {
if c.allowHeadersStr == "" {
c.allowHeadersStr = strings.Join(c.AllowHeaders, ", ")
}
return c.allowHeadersStr
}
func (c *CORS) EncodeExposeHeaders() string {
if c.exposeHeadersStr == "" {
c.exposeHeadersStr = strings.Join(c.ExposeHeaders, ", ")
}
return c.exposeHeadersStr
}
func (c *CORS) EncodeAllowCredentialsHeader() string {
if c.allowCredentialsStr == "" {
c.allowCredentialsStr = strconv.FormatBool(c.AllowCredentials)
}
return c.allowCredentialsStr
}
func (c *CORS) EncodePreflightMaxAgeSeconds() string {
// defensive programing
c.populatePreflightMaxAgeSeconds()
if c.preflightMaxAgeSecondsStr == "" {
c.preflightMaxAgeSecondsStr = strconv.Itoa(*c.PreflightMaxAgeSeconds)
}
return c.preflightMaxAgeSecondsStr
}
func (c *CORS) isAllowAllOrigins() bool {
for _, allowOrigin := range c.AllowOrigins {
if allowOrigin == "*" {
return true
}
}
return false
}
func (c *CORS) populatePreflightMaxAgeSeconds() {
if c.PreflightMaxAgeSeconds == nil {
five := 5
c.PreflightMaxAgeSeconds = &five
}
}