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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 log
import (
"net"
"strings"
"github.com/caddyserver/caddy"
"github.com/caddyserver/caddy/caddyhttp/httpserver"
)
// setup sets up the logging middleware.
func setup(c *caddy.Controller) error {
rules, err := logParse(c)
if err != nil {
return err
}
for _, rule := range rules {
for _, entry := range rule.Entries {
entry.Log.Attach(c)
}
}
httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
return Logger{Next: next, Rules: rules, ErrorFunc: httpserver.DefaultErrorFunc}
})
return nil
}
func logParse(c *caddy.Controller) ([]*Rule, error) {
var rules []*Rule
var logExceptions []string
for c.Next() {
args := c.RemainingArgs()
ip4Mask := net.IPMask(net.ParseIP(DefaultIP4Mask).To4())
ip6Mask := net.IPMask(net.ParseIP(DefaultIP6Mask))
ipMaskExists := false
var logRoller *httpserver.LogRoller
logRoller = httpserver.DefaultLogRoller()
for c.NextBlock() {
what := c.Val()
where := c.RemainingArgs()
if what == "ipmask" {
if len(where) == 0 {
return nil, c.ArgErr()
}
if where[0] != "" {
ip4MaskStr := where[0]
ipv4 := net.ParseIP(ip4MaskStr).To4()
if ipv4 == nil {
return nil, c.Err("IPv4 Mask not valid IP Mask Format")
} else {
ip4Mask = net.IPMask(ipv4)
ipMaskExists = true
}
}
if len(where) > 1 {
ip6MaskStr := where[1]
ipv6 := net.ParseIP(ip6MaskStr)
if ipv6 == nil {
return nil, c.Err("IPv6 Mask not valid IP Mask Format")
} else {
ip6Mask = net.IPMask(ipv6)
ipMaskExists = true
}
}
} else if what == "except" {
for i := 0; i < len(where); i++ {
logExceptions = append(logExceptions, where[i])
}
} else if httpserver.IsLogRollerSubdirective(what) {
if err := httpserver.ParseRoller(logRoller, what, where...); err != nil {
return nil, err
}
} else {
return nil, c.ArgErr()
}
}
path := "/"
format := DefaultLogFormat
output := DefaultLogFilename
switch len(args) {
case 0:
// nothing to change
case 1:
// Only an output file specified
output = args[0]
case 2, 3:
// Path scope, output file, and maybe a format specified
path = args[0]
output = args[1]
if len(args) > 2 {
format = strings.Replace(args[2], "{common}", CommonLogFormat, -1)
format = strings.Replace(format, "{combined}", CombinedLogFormat, -1)
}
default:
// Maximum number of args in log directive is 3.
return nil, c.ArgErr()
}
rules = appendEntry(rules, path, &Entry{
Log: &httpserver.Logger{
Output: output,
Roller: logRoller,
V4ipMask: ip4Mask,
V6ipMask: ip6Mask,
IPMaskExists: ipMaskExists,
Exceptions: logExceptions,
},
Format: format,
})
}
return rules, nil
}
func appendEntry(rules []*Rule, pathScope string, entry *Entry) []*Rule {
for _, rule := range rules {
if rule.PathScope == pathScope {
rule.Entries = append(rule.Entries, entry)
return rules
}
}
rules = append(rules, &Rule{
PathScope: pathScope,
Entries: []*Entry{entry},
})
return rules
}
const (
// IP Masks that have no effect on IP Address
DefaultIP4Mask = "255.255.255.255"
DefaultIP6Mask = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
)
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