forked from caddyserver/caddy
/
rewrite.go
65 lines (52 loc) · 1.33 KB
/
rewrite.go
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// Package rewrite is middleware for rewriting requests internally to
// a different path.
package rewrite
import (
"net/http"
"github.com/mholt/caddy/middleware"
)
// New instantiates a new Rewrites middleware.
func New(c middleware.Controller) (middleware.Middleware, error) {
rewrites, err := parse(c)
if err != nil {
return nil, err
}
return func(next middleware.Handler) middleware.Handler {
return Rewrite{Next: next, Rules: rewrites}
}, nil
}
// Rewrite is middleware to rewrite request locations internally before being handled.
type Rewrite struct {
Next middleware.Handler
Rules []RewriteRule
}
// ServeHTTP implements the middleware.Handler interface.
func (rw Rewrite) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, rule := range rw.Rules {
if r.URL.Path == rule.From {
r.URL.Path = rule.To
break
}
}
return rw.Next.ServeHTTP(w, r)
}
func parse(c middleware.Controller) ([]RewriteRule, error) {
var rewrites []RewriteRule
for c.Next() {
var rule RewriteRule
if !c.NextArg() {
return rewrites, c.ArgErr()
}
rule.From = c.Val()
if !c.NextArg() {
return rewrites, c.ArgErr()
}
rule.To = c.Val()
rewrites = append(rewrites, rule)
}
return rewrites, nil
}
// RewriteRule describes an internal location rewrite rule.
type RewriteRule struct {
From, To string
}