Initial commit
This commit is contained in:
Manu Mtz.-Almeida
commit
322e348743
177
config.go
Normal file
177
config.go
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@ -0,0 +1,177 @@
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package cors
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import (
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"net/http"
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"net/textproto"
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"strconv"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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)
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type cors struct {
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allowAllOrigins bool
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allowedOriginFunc func(string) bool
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allowedOrigins []string
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allowedMethods []string
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allowedHeaders []string
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exposedHeaders []string
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normalHeaders http.Header
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preflightHeaders http.Header
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}
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func newCors(c Config) *cors {
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if err := c.Validate(); err != nil {
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panic(err.Error())
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}
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return &cors{
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allowedOriginFunc: c.AllowOriginFunc,
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allowAllOrigins: c.AllowAllOrigins,
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allowedOrigins: normalize(c.AllowedOrigins),
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allowedMethods: normalize(c.AllowedMethods),
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allowedHeaders: normalize(c.AllowedHeaders),
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normalHeaders: generateNormalHeaders(c),
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preflightHeaders: generatePreflightHeaders(c),
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}
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}
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func (cors *cors) applyCors(c *gin.Context) {
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origin := c.Request.Header.Get("Origin")
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if len(origin) == 0 {
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// request is not a CORS request
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return
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}
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if !cors.validateOrigin(origin) {
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goto failed
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}
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if c.Request.Method == "OPTIONS" {
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if !cors.handlePreflight(c) {
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goto failed
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}
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} else if !cors.handleNormal(c) {
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goto failed
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}
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if cors.allowAllOrigins {
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c.Header("Access-Control-Allow-Origin", "*")
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} else {
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c.Header("Access-Control-Allow-Origin", origin)
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}
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return
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failed:
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c.AbortWithStatus(http.StatusForbidden)
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}
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func (cors *cors) validateOrigin(origin string) bool {
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if cors.allowAllOrigins {
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return true
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}
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if cors.allowedOriginFunc != nil {
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return cors.allowedOriginFunc(origin)
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}
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for _, value := range cors.allowedOrigins {
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if value == origin {
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return true
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}
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}
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return false
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}
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func (cors *cors) validateMethod(method string) bool {
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for _, value := range cors.allowedMethods {
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if strings.EqualFold(value, method) {
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return true
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}
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}
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return false
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}
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func (cors *cors) validateHeader(header string) bool {
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for _, value := range cors.allowedHeaders {
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if strings.EqualFold(value, header) {
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return true
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}
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}
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return false
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}
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func (cors *cors) handlePreflight(c *gin.Context) bool {
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c.AbortWithStatus(200)
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if !cors.validateMethod(c.Request.Header.Get("Access-Control-Request-Method")) {
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return false
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}
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if !cors.validateHeader(c.Request.Header.Get("Access-Control-Request-Header")) {
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return false
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}
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for key, value := range cors.preflightHeaders {
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c.Writer.Header()[key] = value
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}
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return true
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}
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func (cors *cors) handleNormal(c *gin.Context) bool {
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for key, value := range cors.normalHeaders {
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c.Writer.Header()[key] = value
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}
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return true
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}
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func generateNormalHeaders(c Config) http.Header {
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headers := make(http.Header)
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if c.AllowCredentials {
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headers.Set("Access-Control-Allow-Credentials", "true")
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}
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if len(c.ExposedHeaders) > 0 {
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headers.Set("Access-Control-Expose-Headers", strings.Join(c.ExposedHeaders, ", "))
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}
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if c.AllowAllOrigins {
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headers.Set("Access-Control-Allow-Origin", "*")
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} else {
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headers.Set("Vary", "Origin")
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}
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return headers
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}
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func generatePreflightHeaders(c Config) http.Header {
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headers := make(http.Header)
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if c.AllowCredentials {
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headers.Set("Access-Control-Allow-Credentials", "true")
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}
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if len(c.AllowedMethods) > 0 {
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value := strings.Join(c.AllowedMethods, ", ")
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headers.Set("Access-Control-Allow-Methods", value)
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}
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if len(c.AllowedHeaders) > 0 {
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value := strings.Join(c.AllowedHeaders, ", ")
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headers.Set("Access-Control-Allow-Headers", value)
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}
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if c.MaxAge > time.Duration(0) {
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value := strconv.FormatInt(int64(c.MaxAge/time.Second), 10)
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headers.Set("Access-Control-Max-Age", value)
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}
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if c.AllowAllOrigins {
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headers.Set("Access-Control-Allow-Origin", "*")
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} else {
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headers.Set("Vary", "Origin")
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}
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return headers
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}
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func normalize(values []string) []string {
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if values == nil {
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return nil
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}
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distinctMap := make(map[string]bool, len(values))
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normalized := make([]string, 0, len(values))
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for _, value := range values {
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value = strings.TrimSpace(value)
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value = textproto.CanonicalMIMEHeaderKey(value)
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if _, seen := distinctMap[value]; !seen {
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normalized = append(normalized, value)
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distinctMap[value] = true
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}
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}
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return normalized
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}
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101
cors.go
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101
cors.go
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@ -0,0 +1,101 @@
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package cors
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import (
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"errors"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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)
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type Config struct {
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AbortOnError bool
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AllowAllOrigins bool
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// AllowedOrigins is a list of origins a cross-domain request can be executed from.
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// If the special "*" value is present in the list, all origins will be allowed.
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// Default value is ["*"]
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AllowedOrigins []string
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// AllowOriginFunc is a custom function to validate the origin. It take the origin
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// as argument and returns true if allowed or false otherwise. If this option is
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// set, the content of AllowedOrigins is ignored.
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AllowOriginFunc func(origin string) bool
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// AllowedMethods is a list of methods the client is allowed to use with
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// cross-domain requests. Default value is simple methods (GET and POST)
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AllowedMethods []string
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// AllowedHeaders is list of non simple headers the client is allowed to use with
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// cross-domain requests.
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// If the special "*" value is present in the list, all headers will be allowed.
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// Default value is [] but "Origin" is always appended to the list.
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AllowedHeaders []string
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// ExposedHeaders indicates which headers are safe to expose to the API of a CORS
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// API specification
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ExposedHeaders []string
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// AllowCredentials indicates whether the request can include user credentials like
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// cookies, HTTP authentication or client side SSL certificates.
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AllowCredentials bool
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// MaxAge indicates how long (in seconds) the results of a preflight request
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// can be cached
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MaxAge time.Duration
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}
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func (c *Config) AddAllowedMethods(methods ...string) {
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c.AllowedMethods = append(c.AllowedMethods, methods...)
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}
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func (c *Config) AddAllowedHeaders(headers ...string) {
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c.AllowedHeaders = append(c.AllowedHeaders, headers...)
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}
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func (c *Config) AddExposedHeaders(headers ...string) {
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c.ExposedHeaders = append(c.ExposedHeaders, headers...)
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}
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func (c Config) Validate() error {
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if c.AllowAllOrigins && (c.AllowOriginFunc != nil || len(c.AllowedOrigins) > 0) {
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return errors.New("conflict settings: all origins are allowed. AllowOriginFunc or AllowedOrigins is not needed")
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}
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if !c.AllowAllOrigins && c.AllowOriginFunc == nil && len(c.AllowedOrigins) == 0 {
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return errors.New("conflict settings: all origins disabled")
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}
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if c.AllowOriginFunc != nil && len(c.AllowedOrigins) > 0 {
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return errors.New("conflict settings: if a allow origin func is provided, AllowedOrigins is not needed")
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}
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for _, origin := range c.AllowedOrigins {
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if !strings.HasPrefix(origin, "http://") && !strings.HasPrefix(origin, "https://") {
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return errors.New("bad origin: origins must include http:// or https://")
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}
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}
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return nil
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}
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func DefaultConfig() Config {
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return Config{
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AbortOnError: false,
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AllowAllOrigins: true,
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AllowedMethods: []string{"GET", "POST", "PUT", "PATCH", "HEAD"},
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AllowedHeaders: []string{"Content-Type"},
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//ExposedHeaders: "",
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AllowCredentials: false,
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MaxAge: 12 * time.Hour,
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}
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}
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func Default() gin.HandlerFunc {
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return New(DefaultConfig())
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}
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func New(config Config) gin.HandlerFunc {
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s := newCors(config)
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// Algorithm based in http://www.html5rocks.com/static/images/cors_server_flowchart.png
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return func(c *gin.Context) {
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s.applyCors(c)
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}
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}
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151
cors_test.go
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151
cors_test.go
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@ -0,0 +1,151 @@
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package cors
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import (
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"net/http"
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"net/http/httptest"
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"testing"
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"github.com/gin-gonic/gin"
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"github.com/stretchr/testify/assert"
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)
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func init() {
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gin.SetMode(gin.TestMode)
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}
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func performRequest(r http.Handler, method, path string) *httptest.ResponseRecorder {
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req, _ := http.NewRequest(method, path, nil)
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w := httptest.NewRecorder()
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r.ServeHTTP(w, req)
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return w
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}
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func TestBadConfig(t *testing.T) {
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assert.Panics(t, func() { New(Config{}) })
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assert.Panics(t, func() {
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New(Config{
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AllowAllOrigins: true,
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AllowedOrigins: []string{"http://google.com"},
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})
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})
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assert.Panics(t, func() {
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New(Config{
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AllowAllOrigins: true,
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AllowOriginFunc: func(origin string) bool { return false },
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})
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})
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assert.Panics(t, func() {
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New(Config{
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AllowedOrigins: []string{"http://google.com"},
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AllowOriginFunc: func(origin string) bool { return false },
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})
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})
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assert.Panics(t, func() {
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New(Config{
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AllowedOrigins: []string{"google.com"},
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})
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})
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}
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func TestNormalize(t *testing.T) {
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values := normalize([]string{
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"http-access ", "post", "POST", " poSt ",
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"HTTP-Access", "",
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})
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assert.Equal(t, values, []string{"Http-Access", "Post", ""})
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values = normalize(nil)
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assert.Nil(t, values)
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values = normalize([]string{})
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assert.Equal(t, values, []string{})
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}
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func TestGenerateNormalHeaders(t *testing.T) {
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header := generateNormalHeaders(Config{
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AllowAllOrigins: false,
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})
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assert.Contains(t, header.Get("Access-Control-Allow-Origin"), "")
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assert.Contains(t, header.Get("Vary"), "Origin")
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header = generateNormalHeaders(Config{
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AllowAllOrigins: true,
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})
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assert.Contains(t, header.Get("Access-Control-Allow-Origin"), "*")
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assert.Contains(t, header.Get("Vary"), "")
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header = generateNormalHeaders(Config{
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AllowCredentials: true,
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})
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assert.Contains(t, header.Get("Access-Control-Allow-Credentials"), "true")
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header = generateNormalHeaders(Config{
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AllowCredentials: false,
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})
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assert.Contains(t, header.Get("Access-Control-Allow-Credentials"), "")
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header = generateNormalHeaders(Config{
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ExposedHeaders: []string{"x-user", "xpassword"},
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})
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assert.Contains(t, header.Get("Access-Control-Expose-Headers"), "x-user, xpassword")
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}
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//
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// func TestDeny0(t *testing.T) {
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// called := false
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//
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// router := gin.New()
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// router.Use(New(Config{
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// AllowedOrigins: []string{"http://example.com"},
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// }))
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// router.GET("/", func(c *gin.Context) {
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// called = true
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// })
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// w := httptest.NewRecorder()
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// req, _ := http.NewRequest("GET", "/", nil)
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// req.Header.Set("Origin", "https://example.com")
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// router.ServeHTTP(w, req)
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//
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// assert.True(t, called)
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// assert.NotContains(t, w.Header(), "Access-Control")
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// }
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//
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// func TestDenyAbortOnError(t *testing.T) {
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// called := false
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//
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// router := gin.New()
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// router.Use(New(Config{
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// AbortOnError: true,
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// AllowedOrigins: []string{"http://example.com"},
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// }))
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// router.GET("/", func(c *gin.Context) {
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// called = true
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// })
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//
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// w := httptest.NewRecorder()
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// req, _ := http.NewRequest("GET", "/", nil)
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// req.Header.Set("Origin", "https://example.com")
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// router.ServeHTTP(w, req)
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//
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// assert.False(t, called)
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// assert.NotContains(t, w.Header(), "Access-Control")
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// }
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//
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// func TestDeny2(t *testing.T) {
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//
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// }
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// func TestDeny3(t *testing.T) {
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//
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// }
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//
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// func TestPasses0(t *testing.T) {
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//
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// }
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//
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// func TestPasses1(t *testing.T) {
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//
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// }
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//
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// func TestPasses2(t *testing.T) {
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//
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// }
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