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config.go
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config.go
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//
// config.go
//
// Created by Frederic DELBOS - fred@hyperboloide.com on Nov 13 2014.
//
package main
import (
"crypto/rand"
"encoding/json"
"errors"
"fmt"
"github.com/docopt/docopt-go"
"github.com/fdelbos/fe/rw"
"log"
"os"
"regexp"
"strconv"
"io/ioutil"
)
type Configuration struct {
Encoders map[string]rw.Encoder
Decoders map[string]rw.Decoder
Outputers map[string]rw.Outputer
Inputers map[string]rw.Inputer
Deleters map[string]rw.Deleter
Services map[string]*Service
Backends map[string]Backend
Caches map[string]Cache
}
func typeToInstance(ty string) (interface{}, error) {
switch ty {
case "aes256":
return new(rw.AES256), nil
case "gzip":
return new(rw.Gzip), nil
case "file":
return new(rw.File), nil
case "resize":
return new(rw.Resize), nil
case "s3":
return new(rw.S3Bucket), nil
case "shell":
return new(rw.Shell), nil
default:
return nil, errors.New("Unsupported module type '" + ty +"'")
}
return nil, nil
}
func (c *Configuration) extractRW(name string, raw json.RawMessage) error {
m := make(map[string]json.RawMessage)
if err := json.Unmarshal(raw, &m); err != nil {
return err
}
if _, exists := m["type"]; exists == false {
return errors.New("module '" + name + "' doesn't have a type")
}
var ty string
if err := json.Unmarshal(m["type"], &ty); err != nil {
return err
}
obj, err := typeToInstance(ty)
if err != nil {
return err
}
if err := json.Unmarshal(raw, obj); err != nil {
return err
}
switch v := obj.(type) {
case rw.Encoder:
c.Encoders[name] = v
}
switch v := obj.(type) {
case rw.Decoder:
c.Decoders[name] = v
}
switch v := obj.(type) {
case rw.Outputer:
c.Outputers[name] = v
}
switch v := obj.(type) {
case rw.Inputer:
c.Inputers[name] = v
}
switch v := obj.(type) {
case rw.Deleter:
c.Deleters[name] = v
}
return nil
}
func getAuth(right string) Access {
switch right {
case "denied":
return AccDenied
case "private":
return AccPrivate
case "commit":
return AccCommit
case "token":
return AccToken
case "public":
return AccPublic
default:
log.Fatal("Unknow access right: " + right)
}
return AccDenied
}
type JsonService struct {
Cache string `json:"cache"`
Backend string `json:"backend"`
Get struct {
Access string `json:"access"`
Pipeline []string `json:"pipeline"`
Input string `json:"input"`
} `json:"get,omitempty"`
Post struct {
Access string `json:"access"`
Pipeline []string `json:"pipeline,omitempty"`
Output string `json:"output"`
} `json:"post,omitempty"`
Delete struct {
Access string `json:"access"`
Deleter string `json:"deleter"`
} `json:"delete,omitempty"`
}
func (c *Configuration) buildServicePost(s *Service, js *JsonService) error {
s.Post = getAuth(js.Post.Access)
if js.Post.Output == "" {
return errors.New("POST method requires an 'output'")
}
if _, exists := c.Outputers[js.Post.Output]; exists == false {
return errors.New("output '" + js.Post.Output + "' is undefined")
}
s.EncodingPipe = &rw.EncodingPipeline{
Encoders: make([]rw.Encoder, 0),
Output: c.Outputers[js.Post.Output],
}
if js.Post.Pipeline != nil && len(js.Post.Pipeline) > 0 {
for _, v := range js.Post.Pipeline {
if _, exists := c.Encoders[v]; exists == false {
log.Fatal("encoder '" + v + "' is undefined")
}
s.EncodingPipe.Encoders = append(s.EncodingPipe.Encoders, c.Encoders[v])
}
}
return nil
}
func (c *Configuration) buildServiceGet(s *Service, js *JsonService) error {
s.Get = getAuth(js.Get.Access)
if s.Get != AccPrivate && s.Get != AccPublic {
return errors.New("GET access can only be 'denied', 'private' or 'public'")
}
s.DecodingPipe = &rw.DecodingPipeline{
Decoders: make([]rw.Decoder, 0),
Input: nil,
}
if js.Get.Input == "" {
if s.EncodingPipe != nil {
switch v := s.EncodingPipe.Output.(type) {
case rw.Inputer:
s.DecodingPipe.Input = v
default:
return errors.New("GET method requires and 'input'")
}
} else {
return errors.New("GET method requires and 'input'")
}
} else {
if _, exists := c.Inputers[js.Get.Input]; exists == false {
return errors.New("input '" + js.Get.Input + "' is undefined")
}
s.DecodingPipe.Input = c.Inputers[js.Get.Input]
}
if js.Get.Pipeline != nil && len(js.Get.Pipeline) > 0 {
for _, v := range js.Get.Pipeline {
if _, exists := c.Decoders[v]; exists == false {
return errors.New("decoder '" + v + "' is undefined")
}
s.DecodingPipe.Decoders = append(s.DecodingPipe.Decoders, c.Decoders[v])
}
} else {
for i := len(s.EncodingPipe.Encoders) - 1; i >= 0; i -= 1 {
switch v := s.EncodingPipe.Encoders[i].(type) {
case rw.Decoder:
s.DecodingPipe.Decoders = append(s.DecodingPipe.Decoders, v)
}
}
}
return nil
}
var validUrl = regexp.MustCompile(`^(/[^/]+)+$`)
func (c *Configuration) extractService(url string, raw json.RawMessage) error {
if validUrl.MatchString(url) == false {
return errors.New(" '" + url + "' is not a invalid url")
}
js := new(JsonService)
if err := json.Unmarshal(raw, js); err != nil {
return err
}
s := &Service{
Url: url,
Post: AccDenied,
Get: AccDenied,
Delete: AccDenied,
}
if js.Backend != "" {
if _, exists := c.Backends[js.Backend]; exists == false {
return errors.New("service '" + url + "': bakend '" + js.Backend + "' not found")
}
s.Back = c.Backends[js.Backend]
}
if js.Cache != "" {
if _, exists := c.Caches[js.Cache]; exists == false {
return errors.New("cache '" + js.Cache + "' doesn't exists")
}
tokens := &TokenService{
Service: url,
cache: c.Caches[js.Cache],
}
s.Tokens = tokens
}
if js.Post.Access != "" && js.Post.Access != "denied" {
if err := c.buildServicePost(s, js); err != nil {
return err
}
}
if js.Get.Access != "" && js.Get.Access != "denied" {
if err := c.buildServiceGet(s, js); err != nil {
return err
}
}
// need to do delete
c.Services[url] = s
return nil
}
func (c *Configuration) extractBackends(definition map[string]json.RawMessage) error {
for k,v := range definition {
m := make(map[string]json.RawMessage)
if err := json.Unmarshal(v, &m); err != nil {
return err
}
var ty string
if err := json.Unmarshal(m["type"], &ty); err != nil {
return err
}
if ty != "mongodb" {
return errors.New("Unsupported backend '" + ty + "'")
}
b := new(MongoBackend)
if err := json.Unmarshal(v, b); err != nil {
return err
}
if err := b.Init(); err != nil {
return err
}
c.Backends[k] = b
}
return nil
}
func (c *Configuration) extractCaches(definition map[string]json.RawMessage) error {
for k,v := range definition {
m := make(map[string]json.RawMessage)
if err := json.Unmarshal(v, &m); err != nil {
return err
}
var ty string
if err := json.Unmarshal(m["type"], &ty); err != nil {
return err
}
if ty != "redis" {
return errors.New("Unsupported backend '" + ty + "'")
}
b := new(RedisCache)
if err := json.Unmarshal(v, b); err != nil {
return err
}
if err := b.Init(); err != nil {
return err
}
c.Caches[k] = b
}
return nil
}
func newConfiguration(js []byte) (*Configuration, error) {
c := &Configuration{
Encoders: make(map[string]rw.Encoder),
Decoders: make(map[string]rw.Decoder),
Outputers: make(map[string]rw.Outputer),
Inputers: make(map[string]rw.Inputer),
Deleters: make(map[string]rw.Deleter),
Services: make(map[string]*Service),
Backends: make(map[string]Backend),
Caches: make(map[string]Cache),
}
m := make(map[string]json.RawMessage)
if err := json.Unmarshal(js, &m); err != nil {
return nil, err
}
if _, exists := m["caches"]; exists == true {
caches := make(map[string]json.RawMessage)
if err := json.Unmarshal(m["caches"], &caches); err != nil {
return nil, err
}
if err := c.extractCaches(caches); err != nil {
return nil, err
}
}
if _, exists := m["backends"]; exists == true {
backends := make(map[string]json.RawMessage)
if err := json.Unmarshal(m["backends"], &backends); err != nil {
return nil, err
}
if err := c.extractBackends(backends); err != nil {
return nil, err
}
}
if _, exists := m["modules"]; exists == true {
modules := make(map[string]json.RawMessage)
if err := json.Unmarshal(m["modules"], &modules); err != nil {
return nil, err
}
for k, v := range modules {
if err := c.extractRW(k, v); err != nil {
return nil, err
}
}
}
if _, exists := m["api"]; exists == true {
api := make(map[string]json.RawMessage)
if err := json.Unmarshal(m["api"], &api); err != nil {
return nil, err
}
for k, v := range api {
if err := c.extractService(k, v); err != nil {
return nil, err
}
}
}
fmt.Println(c)
return c, nil
}
func genAes(size int) {
var buff []byte
switch size {
case 128:
buff = make([]byte, 16)
case 256:
buff = make([]byte, 32)
default:
log.Fatal("Key size must be 256 for AES 256 or 128 for AES 128")
}
if _, err := rand.Read(buff); err != nil {
log.Fatal(err)
}
os.Stdout.Write(buff)
os.Exit(0)
}
func parseConfig() (*Configuration, error) {
msg := `fe - File Exchange proxy
Usage:
fe [--daemon --private <port> --public <port>] <config>
fe genaes <keysize>
fe -h | --help
fe -v | --version
Options:
-h, --help Show this screen
-v, --version Show version
-d, --daemon Run as a daemon
-p, --private <port> Set Private port [default: 7031]
-u, --public <port> Set Public port [default: 7032]
`
config, err := docopt.Parse(msg, nil, true, "fe 0.1.1", false)
if err != nil {
return nil, err
}
fmt.Println(config)
if config["genaes"].(bool) == true {
size := config["<keysize>"].(string)
i, err := strconv.Atoi(size)
if err != nil {
return nil, err
}
genAes(i)
}
name, exists := config["<config>"]
if exists == false {
return nil, errors.New("No configuration file provided")
}
js, err := ioutil.ReadFile(name.(string))
if err != nil {
return nil, err
}
return newConfiguration(js)
}