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Since Go 1.7, context is a standard package. Since Go 1.9, everything that is provided by "x/net/context" is a couple of type aliases to types in "context". Many vendored packages still use x/net/context, so vendor entry remains for now. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
37 lines
1.5 KiB
Go
37 lines
1.5 KiB
Go
package middleware // import "github.com/docker/docker/api/server/middleware"
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import (
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"context"
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"net/http"
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"github.com/sirupsen/logrus"
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)
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// CORSMiddleware injects CORS headers to each request
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// when it's configured.
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type CORSMiddleware struct {
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defaultHeaders string
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}
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// NewCORSMiddleware creates a new CORSMiddleware with default headers.
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func NewCORSMiddleware(d string) CORSMiddleware {
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return CORSMiddleware{defaultHeaders: d}
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}
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// WrapHandler returns a new handler function wrapping the previous one in the request chain.
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func (c CORSMiddleware) WrapHandler(handler func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error) func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
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return func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
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// If "api-cors-header" is not given, but "api-enable-cors" is true, we set cors to "*"
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// otherwise, all head values will be passed to HTTP handler
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corsHeaders := c.defaultHeaders
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if corsHeaders == "" {
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corsHeaders = "*"
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}
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logrus.Debugf("CORS header is enabled and set to: %s", corsHeaders)
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w.Header().Add("Access-Control-Allow-Origin", corsHeaders)
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w.Header().Add("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, X-Registry-Auth")
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w.Header().Add("Access-Control-Allow-Methods", "HEAD, GET, POST, DELETE, PUT, OPTIONS")
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return handler(ctx, w, r, vars)
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}
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}
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