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cors.go
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cors.go
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package silverhttp
import (
"strings"
"github.com/clubpay/ronykit/kit/utils"
"github.com/go-www/silverlining"
"github.com/go-www/silverlining/h1"
)
const (
HeaderAccessControlAllowCredentials = "Access-Control-Allow-Credentials"
HeaderAccessControlAllowHeaders = "Access-Control-Allow-Headers"
HeaderAccessControlAllowMethods = "Access-Control-Allow-Methods"
HeaderAccessControlAllowOrigin = "Access-Control-Allow-Origin"
HeaderAccessControlExposeHeaders = "Access-Control-Expose-Headers"
HeaderAccessControlMaxAge = "Access-Control-Max-Age"
HeaderAccessControlRequestHeaders = "Access-Control-Request-Headers"
HeaderAccessControlRequestMethod = "Access-Control-Request-Method"
HeaderOrigin = "Origin"
HeaderTimingAllowOrigin = "Timing-Allow-Origin"
HeaderXPermittedCrossDomainPolicies = "X-Permitted-Cross-Domain-Policies"
)
type CORSConfig struct {
AllowedHeaders []string
AllowedMethods []string
AllowedOrigins []string
ExposedHeaders []string
IgnoreEmptyOrigin bool
}
type cors struct {
headers string
methods string
origins []string
exposedHeaders string
ignoreEmptyOrigin bool
}
func newCORS(cfg CORSConfig) *cors {
c := &cors{
ignoreEmptyOrigin: cfg.IgnoreEmptyOrigin,
}
if len(cfg.AllowedOrigins) == 0 {
c.origins = []string{"*"}
} else {
c.origins = cfg.AllowedOrigins
}
if len(cfg.AllowedHeaders) == 0 {
cfg.AllowedHeaders = []string{
"Origin", "Accept", "Content-Type",
"X-Requested-With", "X-Auth-Tokens", "Authorization",
}
}
if len(cfg.ExposedHeaders) == 0 {
c.exposedHeaders = "*"
} else {
c.exposedHeaders = strings.Join(cfg.ExposedHeaders, ",")
}
c.headers = strings.Join(cfg.AllowedHeaders, ",")
if len(cfg.AllowedMethods) == 0 {
c.methods = strings.Join([]string{
MethodGet, MethodHead, MethodPost, MethodPut,
MethodPatch, MethodConnect, MethodDelete,
MethodTrace, MethodOptions,
}, ", ")
} else {
c.methods = strings.Join(cfg.AllowedMethods, ", ")
}
return c
}
func (cors *cors) handle(rc *httpConn) {
if cors == nil {
return
}
resHdr := rc.ctx.ResponseHeaders()
// ByPass cors (Cross Origin Resource Sharing) check
resHdr.Set("Vary", HeaderOrigin)
resHdr.Set(HeaderAccessControlExposeHeaders, cors.exposedHeaders)
origin := rc.Get(HeaderOrigin)
if cors.origins[0] == "*" {
resHdr.Set(HeaderAccessControlAllowOrigin, origin)
} else {
for _, allowedOrigin := range cors.origins {
if strings.EqualFold(origin, allowedOrigin) {
resHdr.Set(HeaderAccessControlAllowOrigin, origin)
}
}
}
if rc.ctx.Method() == h1.MethodOPTIONS {
resHdr.Set(
"Vary",
strings.Join(
[]string{
HeaderAccessControlRequestMethod,
HeaderAccessControlRequestHeaders,
},
",",
),
)
resHdr.Set(HeaderAccessControlRequestMethod, cors.methods)
reqHeaders, _ := rc.ctx.RequestHeaders().GetBytes(utils.S2B(HeaderAccessControlRequestHeaders))
if len(reqHeaders) > 0 {
resHdr.Set(HeaderAccessControlAllowHeaders, utils.B2S(reqHeaders))
} else {
resHdr.Set(HeaderAccessControlAllowHeaders, cors.headers)
}
resHdr.Set(HeaderAccessControlAllowMethods, cors.methods)
rc.ctx.WriteHeader(StatusNoContent)
}
}
func (cors *cors) handleWS(ctx *silverlining.Context) bool {
if cors == nil {
return true
}
origin, _ := ctx.RequestHeaders().Get(HeaderOrigin)
if origin == "" && cors.ignoreEmptyOrigin {
return true
}
if cors.origins[0] == "*" {
return true
} else {
for _, allowedOrigin := range cors.origins {
if strings.EqualFold(origin, allowedOrigin) {
return true
}
}
}
return false
}