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package store
import (
"bytes"
"encoding/base64"
"fmt"
"io"
"regexp"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ssm"
)
const SSM_MAX_SIZE = 4096
// ((16^4)*4096)/1024/1024
// If we ever need more than 256 MB in parameter store, we've done something
// very wrong.
const SSM_KEY_FORMAT = "%s-%04X" //
var (
// TrimRegex is used to group the SSM keys inside of the Info struct under
// ByKey. This will only be used for params that exceed 4KB.
TrimRegex = regexp.MustCompile("-[0-9A-E][0-9A-E][0-9A-E][0-9A-E]$")
// Optional, can be set set to utilize a specific KMS key if desired.
KMS_KEY_ID *string = nil
Tags = []*ssm.Tag{}
)
type Info struct {
ByKey map[string]*Entry
ByFullKey map[string]*Entry
}
func (i *Info) init() {
if i.ByKey == nil {
i.ByKey = map[string]*Entry{}
}
if i.ByFullKey == nil {
i.ByFullKey = map[string]*Entry{}
}
}
func (i *Info) add(e *ssm.ParameterMetadata) {
name := TrimRegex.ReplaceAllString(*e.Name, "")
var entry *Entry
// Doesn't exist, make a new entry
if _, ok := i.ByKey[name]; !ok {
entry = &Entry{
Name: name,
Keys: []*ssm.ParameterMetadata{e},
}
i.ByKey[name] = entry
i.ByFullKey[*e.Name] = entry
return
}
// Otherwise let's just update the one that's there
entry = i.ByKey[name]
entry.Keys = append(entry.Keys, e)
i.ByFullKey[*e.Name] = entry
}
type Entry struct {
Name string
Keys []*ssm.ParameterMetadata
}
// GetInfo returns a populated Info struct from the SSM
func GetInfo(svc *ssm.SSM) (*Info, error) {
ret := &Info{
ByKey: map[string]*Entry{},
ByFullKey: map[string]*Entry{},
}
var out = &ssm.DescribeParametersOutput{}
var err error
for {
out, err = svc.DescribeParameters(&ssm.DescribeParametersInput{
NextToken: out.NextToken,
})
if err != nil {
return nil, err
}
for _, entry := range out.Parameters {
ret.add(entry)
}
if out.NextToken == nil {
break
}
}
return ret, nil
}
func InsertParam(svc *ssm.SSM, rdr io.Reader, key string) error {
buf := &bytes.Buffer{}
enc := base64.NewEncoder(base64.StdEncoding, buf)
_, err := io.Copy(enc, rdr)
if err != nil {
return fmt.Errorf("Error while reading stdin: %w", err)
}
err = enc.Close()
if err != nil {
return fmt.Errorf("While closing encoder: %w", err)
}
n := 1
for {
key := fmt.Sprintf(SSM_KEY_FORMAT, key, n)
n++
paramBuf := &bytes.Buffer{}
n, err := io.CopyN(paramBuf, buf, SSM_MAX_SIZE)
if err != io.EOF && err != nil {
return fmt.Errorf("While writing output: %w", err)
}
// fmt.Fprintf(os.Stderr, "Wrote '%d' bytes to '%s'\n", n, key)
_, err = svc.PutParameter(&ssm.PutParameterInput{
KeyId: KMS_KEY_ID,
Name: aws.String(key),
Type: aws.String("SecureString"),
Value: aws.String(paramBuf.String()),
Tags: Tags,
})
if err != nil {
return fmt.Errorf("Failed putting prameter: %w", err)
}
if err == io.EOF || n < SSM_MAX_SIZE {
break
}
}
return nil
}
func GetParam(svc *ssm.SSM, wrtr io.Writer, key string) error {
n := 1
buf := &bytes.Buffer{}
for {
key := fmt.Sprintf(SSM_KEY_FORMAT, key, n)
n++
out, err := svc.GetParameter(&ssm.GetParameterInput{
Name: aws.String(key),
WithDecryption: aws.Bool(true),
})
if err != nil {
return fmt.Errorf("While fetching: '%s': %w", key, err)
}
w, err := buf.WriteString(*out.Parameter.Value)
if err != nil {
return fmt.Errorf("While writing to buffer: %w", err)
}
if w != SSM_MAX_SIZE {
break
}
}
dec := base64.NewDecoder(base64.StdEncoding, buf)
_, err := io.Copy(wrtr, dec)
if err != nil {
return fmt.Errorf("Error writing output: %w", err)
}
return nil
}
func RemoveParam(svc *ssm.SSM, key string) error {
info, err := GetInfo(svc)
if err != nil {
return fmt.Errorf("When fetching info: %w", err)
}
entry, ok := info.ByKey[key]
if !ok {
return fmt.Errorf("Entry '%s' not found in parameter store", key)
}
var e error
for _, key := range entry.Keys {
_, err := svc.DeleteParameter(&ssm.DeleteParameterInput{
Name: key.Name,
})
if err != nil {
if e == nil {
e = err
} else {
e = fmt.Errorf("%s, %w", err, e)
}
}
}
return e
}
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