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helper.go
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helper.go
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// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package helper
import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
"strings"
"github.com/spf13/cobra"
"github.com/vine-io/vine/util/context/metadata"
)
type Args interface {
// Get returns the nth argument, or else a blank string
Get(n int) string
// First returns the first argument, or else a blank string
First() string
// Tail returns the rest of the arguments (not the first one)
// or else an empty string slice
Tail() []string
// Len returns the length of the wrapped slice
Len() int
// Present checks if there are any arguments present
Present() bool
// Slice returns a copy of the internal slice
Slice() []string
}
type args []string
func NewArgs(ar []string) Args {
a := args(ar)
return &a
}
func (a *args) Get(n int) string {
if len(*a) > n {
return (*a)[n]
}
return ""
}
func (a *args) First() string {
return a.Get(0)
}
func (a *args) Tail() []string {
if a.Len() >= 2 {
tail := []string((*a)[1:])
ret := make([]string, len(tail))
copy(ret, tail)
return ret
}
return []string{}
}
func (a *args) Len() int {
return len(*a)
}
func (a *args) Present() bool {
return a.Len() != 0
}
func (a *args) Slice() []string {
ret := make([]string, len(*a))
copy(ret, *a)
return ret
}
func RequestToContext(r *http.Request) context.Context {
ctx := context.Background()
md := make(metadata.Metadata)
for key, values := range r.Header {
md.Set(key, strings.Join(values, ","))
}
return metadata.NewContext(ctx, md)
}
func TLSConfig(cmd *cobra.Command) (*tls.Config, error) {
flags := cmd.PersistentFlags()
cert, _ := flags.GetString("tls-cert-file")
key, _ := flags.GetString("tls-key-file")
ca, _ := flags.GetString("tls-client-ca-file")
if len(cert) > 0 && len(key) > 0 {
certs, err := tls.LoadX509KeyPair(cert, key)
if err != nil {
return nil, err
}
if len(ca) > 0 {
caCert, err := ioutil.ReadFile(ca)
if err != nil {
return nil, err
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
return &tls.Config{
Certificates: []tls.Certificate{certs},
ClientCAs: caCertPool,
ClientAuth: tls.RequireAndVerifyClientCert,
NextProtos: []string{"h2", "http/1.1"},
}, nil
}
return &tls.Config{
Certificates: []tls.Certificate{certs}, NextProtos: []string{"h2", "http/1.1"},
}, nil
}
return nil, errors.New("TLS certificate and key files not specified")
}
// UnexpectedSubcommand checks for erroneous subcommands and prints help and returns error
func UnexpectedSubcommand(cmd *cobra.Command) error {
ar := args(cmd.PersistentFlags().Args())
if first := ar.First(); first != "" {
// received something that isn't a subcommand
return fmt.Errorf("unrecognized subcommand for %s: %s. Please refer to '%s help'", cmd.Name(), first, cmd.Name())
}
return nil
}
func UnexpectedCommand(cmd *cobra.Command) error {
commandName := ""
// We fall back to os.Args as ctx does not seem to have the original command.
for _, arg := range os.Args[1:] {
// Exclude flags
if !strings.HasPrefix(arg, "-") {
commandName = arg
}
}
return fmt.Errorf("unrecognized vine command: %s. Please refer to 'vine help'", commandName)
}