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a762bec06d
On matched header rules, replacer is used to replace any placeholders
defined in header rules iex. X-Backend {hostname} where {hostname} will
be replaced by the hostname key present in the replacer
hostname key added to replacer. The value is determined by the output of
`os.Hostname()`
52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
// Package headers provides middleware that appends headers to
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// requests based on a set of configuration rules that define
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// which routes receive which headers.
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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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"github.com/mholt/caddy/middleware"
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)
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// Headers is middleware that adds headers to the responses
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// for requests matching a certain path.
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type Headers struct {
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Next middleware.Handler
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Rules []Rule
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}
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// ServeHTTP implements the middleware.Handler interface and serves requests,
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// setting headers on the response according to the configured rules.
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func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
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replacer := middleware.NewReplacer(r, nil, "")
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for _, rule := range h.Rules {
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if middleware.Path(r.URL.Path).Matches(rule.Path) {
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for _, header := range rule.Headers {
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if strings.HasPrefix(header.Name, "-") {
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w.Header().Del(strings.TrimLeft(header.Name, "-"))
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} else {
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w.Header().Set(header.Name, replacer.Replace(header.Value))
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}
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}
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}
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}
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return h.Next.ServeHTTP(w, r)
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}
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type (
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// Rule groups a slice of HTTP headers by a URL pattern.
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// TODO: use http.Header type instead?
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Rule struct {
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Path string
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Headers []Header
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}
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// Header represents a single HTTP header, simply a name and value.
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Header struct {
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Name string
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Value string
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}
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)
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