Matthew Holt
6 years ago
4 changed files with 93 additions and 0 deletions
@ -0,0 +1,82 @@ |
|||
package headers |
|||
|
|||
import ( |
|||
"net/http" |
|||
"strings" |
|||
|
|||
"bitbucket.org/lightcodelabs/caddy2" |
|||
"bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp" |
|||
) |
|||
|
|||
func init() { |
|||
caddy2.RegisterModule(caddy2.Module{ |
|||
Name: "http.middleware.headers", |
|||
New: func() (interface{}, error) { return new(Headers), nil }, |
|||
}) |
|||
} |
|||
|
|||
// Headers is a middleware which can mutate HTTP headers.
|
|||
type Headers struct { |
|||
Request HeaderOps |
|||
Response RespHeaderOps |
|||
} |
|||
|
|||
// HeaderOps defines some operations to
|
|||
// perform on HTTP headers.
|
|||
type HeaderOps struct { |
|||
Add http.Header |
|||
Set http.Header |
|||
Delete []string |
|||
} |
|||
|
|||
// RespHeaderOps is like HeaderOps, but
|
|||
// optionally deferred until response time.
|
|||
type RespHeaderOps struct { |
|||
HeaderOps |
|||
Deferred bool `json:"deferred"` |
|||
} |
|||
|
|||
func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error { |
|||
apply(h.Request, r.Header) |
|||
if h.Response.Deferred { |
|||
w = &responseWriterWrapper{ |
|||
ResponseWriterWrapper: &caddyhttp.ResponseWriterWrapper{ResponseWriter: w}, |
|||
headerOps: h.Response.HeaderOps, |
|||
} |
|||
} else { |
|||
apply(h.Response.HeaderOps, w.Header()) |
|||
} |
|||
return next.ServeHTTP(w, r) |
|||
} |
|||
|
|||
func apply(ops HeaderOps, hdr http.Header) { |
|||
for fieldName, vals := range ops.Add { |
|||
for _, v := range vals { |
|||
hdr.Add(fieldName, v) |
|||
} |
|||
} |
|||
for fieldName, vals := range ops.Set { |
|||
hdr.Set(fieldName, strings.Join(vals, ",")) |
|||
} |
|||
for _, fieldName := range ops.Delete { |
|||
hdr.Del(fieldName) |
|||
} |
|||
} |
|||
|
|||
// responseWriterWrapper defers response header
|
|||
// operations until WriteHeader is called.
|
|||
type responseWriterWrapper struct { |
|||
*caddyhttp.ResponseWriterWrapper |
|||
headerOps HeaderOps |
|||
} |
|||
|
|||
func (rww *responseWriterWrapper) WriteHeader(status int) { |
|||
apply(rww.headerOps, rww.ResponseWriterWrapper.Header()) |
|||
rww.ResponseWriterWrapper.WriteHeader(status) |
|||
} |
|||
|
|||
// Interface guards
|
|||
var ( |
|||
_ caddyhttp.MiddlewareHandler = (*Headers)(nil) |
|||
_ caddyhttp.HTTPInterfaces = (*responseWriterWrapper)(nil) |
|||
) |
@ -0,0 +1,7 @@ |
|||
package headers |
|||
|
|||
import "testing" |
|||
|
|||
func TestReqHeaders(t *testing.T) { |
|||
// TODO: write tests
|
|||
} |
Loading…
Reference in new issue