Matthew Holt
6 years ago
4 changed files with 93 additions and 0 deletions
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package headers |
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import ( |
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"net/http" |
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"strings" |
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"bitbucket.org/lightcodelabs/caddy2" |
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"bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp" |
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) |
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func init() { |
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caddy2.RegisterModule(caddy2.Module{ |
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Name: "http.middleware.headers", |
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New: func() (interface{}, error) { return new(Headers), nil }, |
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}) |
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} |
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// Headers is a middleware which can mutate HTTP headers.
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type Headers struct { |
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Request HeaderOps |
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Response RespHeaderOps |
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} |
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// HeaderOps defines some operations to
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// perform on HTTP headers.
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type HeaderOps struct { |
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Add http.Header |
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Set http.Header |
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Delete []string |
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} |
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// RespHeaderOps is like HeaderOps, but
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// optionally deferred until response time.
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type RespHeaderOps struct { |
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HeaderOps |
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Deferred bool `json:"deferred"` |
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} |
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func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error { |
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apply(h.Request, r.Header) |
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if h.Response.Deferred { |
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w = &responseWriterWrapper{ |
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ResponseWriterWrapper: &caddyhttp.ResponseWriterWrapper{ResponseWriter: w}, |
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headerOps: h.Response.HeaderOps, |
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} |
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} else { |
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apply(h.Response.HeaderOps, w.Header()) |
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} |
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return next.ServeHTTP(w, r) |
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} |
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func apply(ops HeaderOps, hdr http.Header) { |
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for fieldName, vals := range ops.Add { |
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for _, v := range vals { |
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hdr.Add(fieldName, v) |
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} |
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} |
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for fieldName, vals := range ops.Set { |
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hdr.Set(fieldName, strings.Join(vals, ",")) |
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} |
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for _, fieldName := range ops.Delete { |
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hdr.Del(fieldName) |
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} |
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} |
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// responseWriterWrapper defers response header
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// operations until WriteHeader is called.
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type responseWriterWrapper struct { |
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*caddyhttp.ResponseWriterWrapper |
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headerOps HeaderOps |
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} |
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func (rww *responseWriterWrapper) WriteHeader(status int) { |
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apply(rww.headerOps, rww.ResponseWriterWrapper.Header()) |
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rww.ResponseWriterWrapper.WriteHeader(status) |
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} |
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// Interface guards
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var ( |
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_ caddyhttp.MiddlewareHandler = (*Headers)(nil) |
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_ caddyhttp.HTTPInterfaces = (*responseWriterWrapper)(nil) |
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) |
@ -0,0 +1,7 @@ |
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package headers |
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import "testing" |
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func TestReqHeaders(t *testing.T) { |
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// TODO: write tests
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} |
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