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setup.go
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setup.go
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// Copyright 2015 Light Code Labs, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rewrite
import (
"net/http"
"strings"
"github.com/icasei/caddy"
"github.com/icasei/caddy/caddyhttp/httpserver"
)
func init() {
caddy.RegisterPlugin("rewrite", caddy.Plugin{
ServerType: "http",
Action: setup,
})
}
// setup configures a new Rewrite middleware instance.
func setup(c *caddy.Controller) error {
rewrites, err := rewriteParse(c)
if err != nil {
return err
}
cfg := httpserver.GetConfig(c)
cfg.AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
return Rewrite{
Next: next,
FileSys: http.Dir(cfg.Root),
Rules: rewrites,
}
})
return nil
}
func rewriteParse(c *caddy.Controller) ([]httpserver.HandlerConfig, error) {
var rules []httpserver.HandlerConfig
for c.Next() {
var rule Rule
var err error
var base = "/"
var pattern, to string
var ext []string
var negate bool
args := c.RemainingArgs()
var matcher httpserver.RequestMatcher
switch len(args) {
case 1:
base = args[0]
fallthrough
case 0:
// Integrate request matcher for 'if' conditions.
matcher, err = httpserver.SetupIfMatcher(c)
if err != nil {
return nil, err
}
for c.NextBlock() {
if httpserver.IfMatcherKeyword(c) {
continue
}
switch c.Val() {
case "r", "regexp":
if !c.NextArg() {
return nil, c.ArgErr()
}
pattern = c.Val()
case "to":
args1 := c.RemainingArgs()
if len(args1) == 0 {
return nil, c.ArgErr()
}
to = strings.Join(args1, " ")
case "ext":
args1 := c.RemainingArgs()
if len(args1) == 0 {
return nil, c.ArgErr()
}
ext = args1
default:
return nil, c.ArgErr()
}
}
// ensure to is specified
if to == "" {
return nil, c.ArgErr()
}
if rule, err = NewComplexRule(base, pattern, to, ext, matcher); err != nil {
return nil, err
}
rules = append(rules, rule)
// the only unhandled case is 2 and above
default:
if args[0] == "not" {
negate = true
args = args[1:]
}
rule, err = NewSimpleRule(args[0], strings.Join(args[1:], " "), negate)
if err != nil {
return nil, err
}
rules = append(rules, rule)
}
}
return rules, nil
}