mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-12 04:32:00 +01:00
1f105dde98
Examples: 1) -metricsAuthKey=file:///abs/path/to/file - reads flag value from the given absolute filepath 2) -metricsAuthKey=file://./relative/path/to/file - reads flag value from the given relative filepath 3) -metricsAuthKey=http://some-host/some/path?query_arg=abc - reads flag value from the given url The flag value is automatically updated when the file contents changes.
124 lines
3.7 KiB
Go
124 lines
3.7 KiB
Go
package flagutil
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"flag"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"strings"
|
|
"sync/atomic"
|
|
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs/fscore"
|
|
)
|
|
|
|
// NewPassword returns new `password` flag with the given name and description.
|
|
//
|
|
// The password value is hidden when calling Password.String() for security reasons,
|
|
// since the returned value can be put in logs.
|
|
// Call Password.Get() for obtaining the real password value.
|
|
func NewPassword(name, description string) *Password {
|
|
description += fmt.Sprintf("\nFlag value can be read from the given file when using -%s=file:///abs/path/to/file or -%s=file://./relative/path/to/file . "+
|
|
"Flag value can be read from the given http/https url when using -%s=http://host/path or -%s=https://host/path", name, name, name, name)
|
|
p := &Password{
|
|
flagname: name,
|
|
}
|
|
s := ""
|
|
p.value.Store(&s)
|
|
flag.Var(p, name, description)
|
|
return p
|
|
}
|
|
|
|
// Password is a flag holding a password.
|
|
//
|
|
// If the flag value is file:///path/to/file or http://host/path ,
|
|
// then its contents is automatically re-read from the given file or url
|
|
type Password struct {
|
|
nextRefreshTimestamp uint64
|
|
|
|
value atomic.Pointer[string]
|
|
|
|
// flagname is the name of the flag
|
|
flagname string
|
|
|
|
// sourcePath contains either url or path to file with the password
|
|
sourcePath string
|
|
}
|
|
|
|
// Get returns the current p value.
|
|
//
|
|
// It re-reads p value from the file:///path/to/file or http://host/path
|
|
// if they were passed to Password.Set.
|
|
func (p *Password) Get() string {
|
|
p.maybeRereadPassword()
|
|
sPtr := p.value.Load()
|
|
return *sPtr
|
|
}
|
|
|
|
func (p *Password) maybeRereadPassword() {
|
|
if p.sourcePath == "" {
|
|
// Fast path - nothing to re-read
|
|
return
|
|
}
|
|
tsCurr := fasttime.UnixTimestamp()
|
|
tsNext := atomic.LoadUint64(&p.nextRefreshTimestamp)
|
|
if tsCurr < tsNext {
|
|
// Fast path - nothing to re-read
|
|
return
|
|
}
|
|
|
|
// Re-read password from p.sourcePath
|
|
atomic.StoreUint64(&p.nextRefreshTimestamp, tsCurr+2)
|
|
s, err := fscore.ReadPasswordFromFileOrHTTP(p.sourcePath)
|
|
if err != nil {
|
|
// cannot use lib/logger, since it can be uninitialized yet
|
|
log.Printf("flagutil: fall back to the previous password for -%s, since failed to re-read it from %q: %s\n", p.flagname, p.sourcePath, err)
|
|
} else {
|
|
p.value.Store(&s)
|
|
}
|
|
}
|
|
|
|
// String implements flag.Value interface.
|
|
func (p *Password) String() string {
|
|
return "secret"
|
|
}
|
|
|
|
// Set implements flag.Value interface.
|
|
func (p *Password) Set(value string) error {
|
|
atomic.StoreUint64(&p.nextRefreshTimestamp, 0)
|
|
switch {
|
|
case strings.HasPrefix(value, "file://"):
|
|
p.sourcePath = strings.TrimPrefix(value, "file://")
|
|
// Do not attempt to read the password from sourcePath now, since the file may not exist yet.
|
|
// The password will be read on the first access via Password.Get.
|
|
// Generate a random password for now in order to prevent from unauthorized access to protected resources
|
|
// while the sourcePath file doesn't exist.
|
|
p.initRandomValue()
|
|
return nil
|
|
case strings.HasPrefix(value, "http://"), strings.HasPrefix(value, "https://"):
|
|
p.sourcePath = value
|
|
// Do not attempt to read the password from sourcePath now, since the url may now exist yet.
|
|
// The password will be read on the first access via Password.Get.
|
|
// Generate a random password for now in order to prevent from unauthorized access to protected resources
|
|
// while the sourcePath file doesn't exist.
|
|
p.initRandomValue()
|
|
return nil
|
|
default:
|
|
p.sourcePath = ""
|
|
p.value.Store(&value)
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (p *Password) initRandomValue() {
|
|
var buf [64]byte
|
|
_, err := io.ReadFull(rand.Reader, buf[:])
|
|
if err != nil {
|
|
// cannot use lib/logger here, since it can be uninitialized yet
|
|
panic(fmt.Errorf("FATAL: cannot read random data: %s", err))
|
|
}
|
|
s := string(buf[:])
|
|
p.value.Store(&s)
|
|
}
|