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|
package cli
import (
"encoding/csv"
"errors"
"fmt"
"strings"
"github.com/docker/swarmkit/api"
)
// ExternalCAOpt is a Value type for parsing external CA specifications.
type ExternalCAOpt struct {
values []*api.ExternalCA
}
// Set parses an external CA option.
func (m *ExternalCAOpt) Set(value string) error {
parsed, err := parseExternalCA(value)
if err != nil {
return err
}
m.values = append(m.values, parsed)
return nil
}
// Type returns the type of this option.
func (m *ExternalCAOpt) Type() string {
return "external-ca"
}
// String returns a string repr of this option.
func (m *ExternalCAOpt) String() string {
externalCAs := []string{}
for _, externalCA := range m.values {
repr := fmt.Sprintf("%s: %s", externalCA.Protocol, externalCA.URL)
externalCAs = append(externalCAs, repr)
}
return strings.Join(externalCAs, ", ")
}
// Value returns the external CAs
func (m *ExternalCAOpt) Value() []*api.ExternalCA {
return m.values
}
// parseExternalCA parses an external CA specification from the command line,
// such as protocol=cfssl,url=https://example.com.
func parseExternalCA(caSpec string) (*api.ExternalCA, error) {
csvReader := csv.NewReader(strings.NewReader(caSpec))
fields, err := csvReader.Read()
if err != nil {
return nil, err
}
externalCA := api.ExternalCA{
Options: make(map[string]string),
}
var (
hasProtocol bool
hasURL bool
)
for _, field := range fields {
parts := strings.SplitN(field, "=", 2)
if len(parts) != 2 {
return nil, fmt.Errorf("invalid field '%s' must be a key=value pair", field)
}
key, value := parts[0], parts[1]
switch strings.ToLower(key) {
case "protocol":
hasProtocol = true
if strings.ToLower(value) == "cfssl" {
externalCA.Protocol = api.ExternalCA_CAProtocolCFSSL
} else {
return nil, fmt.Errorf("unrecognized external CA protocol %s", value)
}
case "url":
hasURL = true
externalCA.URL = value
default:
externalCA.Options[key] = value
}
}
if !hasProtocol {
return nil, errors.New("the external-ca option needs a protocol= parameter")
}
if !hasURL {
return nil, errors.New("the external-ca option needs a url= parameter")
}
return &externalCA, nil
}
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