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moby--moby/api/common.go

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package api
import (
"encoding/json"
"encoding/pem"
"fmt"
"mime"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/system"
"github.com/docker/libtrust"
)
// Common constants for daemon and client.
const (
// DefaultVersion of Current REST API
DefaultVersion string = "1.27"
// NoBaseImageSpecifier is the symbol used by the FROM
// command to specify that no base image is to be used.
NoBaseImageSpecifier string = "scratch"
)
// byPortInfo is a temporary type used to sort types.Port by its fields
type byPortInfo []types.Port
func (r byPortInfo) Len() int { return len(r) }
func (r byPortInfo) Swap(i, j int) { r[i], r[j] = r[j], r[i] }
func (r byPortInfo) Less(i, j int) bool {
if r[i].PrivatePort != r[j].PrivatePort {
return r[i].PrivatePort < r[j].PrivatePort
}
if r[i].IP != r[j].IP {
return r[i].IP < r[j].IP
}
if r[i].PublicPort != r[j].PublicPort {
return r[i].PublicPort < r[j].PublicPort
}
return r[i].Type < r[j].Type
}
// DisplayablePorts returns formatted string representing open ports of container
// e.g. "0.0.0.0:80->9090/tcp, 9988/tcp"
// it's used by command 'docker ps'
func DisplayablePorts(ports []types.Port) string {
type portGroup struct {
first uint16
last uint16
}
groupMap := make(map[string]*portGroup)
var result []string
var hostMappings []string
var groupMapKeys []string
sort.Sort(byPortInfo(ports))
for _, port := range ports {
current := port.PrivatePort
portKey := port.Type
if port.IP != "" {
if port.PublicPort != current {
hostMappings = append(hostMappings, fmt.Sprintf("%s:%d->%d/%s", port.IP, port.PublicPort, port.PrivatePort, port.Type))
continue
}
portKey = fmt.Sprintf("%s/%s", port.IP, port.Type)
}
group := groupMap[portKey]
if group == nil {
groupMap[portKey] = &portGroup{first: current, last: current}
// record order that groupMap keys are created
groupMapKeys = append(groupMapKeys, portKey)
continue
}
if current == (group.last + 1) {
group.last = current
continue
}
result = append(result, formGroup(portKey, group.first, group.last))
groupMap[portKey] = &portGroup{first: current, last: current}
}
for _, portKey := range groupMapKeys {
g := groupMap[portKey]
result = append(result, formGroup(portKey, g.first, g.last))
}
result = append(result, hostMappings...)
return strings.Join(result, ", ")
}
func formGroup(key string, start, last uint16) string {
parts := strings.Split(key, "/")
groupType := parts[0]
var ip string
if len(parts) > 1 {
ip = parts[0]
groupType = parts[1]
}
group := strconv.Itoa(int(start))
if start != last {
group = fmt.Sprintf("%s-%d", group, last)
}
if ip != "" {
group = fmt.Sprintf("%s:%s->%s", ip, group, group)
}
return fmt.Sprintf("%s/%s", group, groupType)
}
// MatchesContentType validates the content type against the expected one
func MatchesContentType(contentType, expectedType string) bool {
mimetype, _, err := mime.ParseMediaType(contentType)
if err != nil {
logrus.Errorf("Error parsing media type: %s error: %v", contentType, err)
}
return err == nil && mimetype == expectedType
}
// LoadOrCreateTrustKey attempts to load the libtrust key at the given path,
// otherwise generates a new one
func LoadOrCreateTrustKey(trustKeyPath string) (libtrust.PrivateKey, error) {
err := system.MkdirAll(filepath.Dir(trustKeyPath), 0700)
if err != nil {
return nil, err
}
trustKey, err := libtrust.LoadKeyFile(trustKeyPath)
if err == libtrust.ErrKeyFileDoesNotExist {
trustKey, err = libtrust.GenerateECP256PrivateKey()
if err != nil {
return nil, fmt.Errorf("Error generating key: %s", err)
}
encodedKey, err := serializePrivateKey(trustKey, filepath.Ext(trustKeyPath))
if err != nil {
return nil, fmt.Errorf("Error serializing key: %s", err)
}
if err := ioutils.AtomicWriteFile(trustKeyPath, encodedKey, os.FileMode(0600)); err != nil {
return nil, fmt.Errorf("Error saving key file: %s", err)
}
} else if err != nil {
return nil, fmt.Errorf("Error loading key file %s: %s", trustKeyPath, err)
}
return trustKey, nil
}
func serializePrivateKey(key libtrust.PrivateKey, ext string) (encoded []byte, err error) {
if ext == ".json" || ext == ".jwk" {
encoded, err = json.Marshal(key)
if err != nil {
return nil, fmt.Errorf("unable to encode private key JWK: %s", err)
}
} else {
pemBlock, err := key.PEMBlock()
if err != nil {
return nil, fmt.Errorf("unable to encode private key PEM: %s", err)
}
encoded = pem.EncodeToMemory(pemBlock)
}
return
}