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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 push
import (
"errors"
"fmt"
"net/http"
"strings"
"github.com/mholt/caddy"
"github.com/mholt/caddy/caddyhttp/httpserver"
)
func init() {
caddy.RegisterPlugin("push", caddy.Plugin{
ServerType: "http",
Action: setup,
})
}
var errInvalidHeader = errors.New("header directive requires [name] [value]")
var errHeaderStartsWithColon = errors.New("header cannot start with colon")
var errMethodNotSupported = errors.New("push supports only GET and HEAD methods")
const pushHeader = "X-Push"
var emptyRules = []Rule{}
// setup configures a new Push middleware
func setup(c *caddy.Controller) error {
rules, err := parsePushRules(c)
if err != nil {
return err
}
cfg := httpserver.GetConfig(c)
cfg.AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
return Middleware{Next: next, Rules: rules, Root: http.Dir(cfg.Root)}
})
return nil
}
func parsePushRules(c *caddy.Controller) ([]Rule, error) {
var rules = make(map[string]*Rule)
for c.NextLine() {
var rule *Rule
var resources []Resource
var ops []ruleOp
parseBlock := func() error {
for c.NextBlock() {
val := c.Val()
switch val {
case "method":
if !c.NextArg() {
return c.ArgErr()
}
method := c.Val()
if err := validateMethod(method); err != nil {
return errMethodNotSupported
}
ops = append(ops, setMethodOp(method))
case "header":
args := c.RemainingArgs()
if len(args) != 2 {
return errInvalidHeader
}
if err := validateHeader(args[0]); err != nil {
return err
}
ops = append(ops, setHeaderOp(args[0], args[1]))
default:
resources = append(resources, Resource{
Path: val,
Method: http.MethodGet,
Header: http.Header{pushHeader: []string{}},
})
}
}
return nil
}
args := c.RemainingArgs()
if len(args) == 0 {
rule = new(Rule)
rule.Path = "/"
rules["/"] = rule
err := parseBlock()
if err != nil {
return emptyRules, err
}
} else {
path := args[0]
if existingRule, ok := rules[path]; ok {
rule = existingRule
} else {
rule = new(Rule)
rule.Path = path
rules[rule.Path] = rule
}
for i := 1; i < len(args); i++ {
resources = append(resources, Resource{
Path: args[i],
Method: http.MethodGet,
Header: http.Header{pushHeader: []string{}},
})
}
err := parseBlock()
if err != nil {
return emptyRules, err
}
}
for _, op := range ops {
op(resources)
}
rule.Resources = append(rule.Resources, resources...)
}
var returnRules []Rule
for _, rule := range rules {
returnRules = append(returnRules, *rule)
}
return returnRules, nil
}
func setHeaderOp(key, value string) func(resources []Resource) {
return func(resources []Resource) {
for index := range resources {
resources[index].Header.Set(key, value)
}
}
}
func setMethodOp(method string) func(resources []Resource) {
return func(resources []Resource) {
for index := range resources {
resources[index].Method = method
}
}
}
func validateHeader(header string) error {
if strings.HasPrefix(header, ":") {
return errHeaderStartsWithColon
}
switch strings.ToLower(header) {
case "content-length", "content-encoding", "trailer", "te", "expect", "host":
return fmt.Errorf("push headers cannot include %s", header)
}
return nil
}
// rules based on https://go-review.googlesource.com/#/c/29439/4/http2/go18.go#94
func validateMethod(method string) error {
if method != http.MethodGet && method != http.MethodHead {
return errMethodNotSupported
}
return nil
}