super-graph/core/internal/allow/allow.go

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package allow
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"os"
"sort"
"strings"
"github.com/chirino/graphql/schema"
"github.com/dosco/super-graph/jsn"
)
const (
AL_QUERY int = iota + 1
AL_VARS
)
type Item struct {
Name string
key string
Query string
Vars json.RawMessage
Comment string
}
type List struct {
filepath string
saveChan chan Item
}
type Config struct {
CreateIfNotExists bool
Persist bool
}
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func New(filename string, conf Config) (*List, error) {
al := List{}
if filename != "" {
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fp := filename
if _, err := os.Stat(fp); err == nil {
al.filepath = fp
} else if !os.IsNotExist(err) {
return nil, err
}
}
if al.filepath == "" {
fp := "./allow.list"
if _, err := os.Stat(fp); err == nil {
al.filepath = fp
} else if !os.IsNotExist(err) {
return nil, err
}
}
if al.filepath == "" {
fp := "./config/allow.list"
if _, err := os.Stat(fp); err == nil {
al.filepath = fp
} else if !os.IsNotExist(err) {
return nil, err
}
}
if al.filepath == "" {
if !conf.CreateIfNotExists {
return nil, errors.New("allow.list not found")
}
if filename == "" {
al.filepath = "./config/allow.list"
} else {
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al.filepath = filename
}
}
var err error
if conf.Persist {
al.saveChan = make(chan Item)
go func() {
for v := range al.saveChan {
if err = al.save(v); err != nil {
break
}
}
}()
}
if err != nil {
return nil, err
}
return &al, nil
}
func (al *List) IsPersist() bool {
return al.saveChan != nil
}
func (al *List) Set(vars []byte, query, comment string) error {
if al.saveChan == nil {
return errors.New("allow.list is read-only")
}
if query == "" {
return errors.New("empty query")
}
var q string
for i := 0; i < len(query); i++ {
c := query[i]
if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' {
q = query
break
} else if c == '{' {
q = "query " + query
break
}
}
al.saveChan <- Item{
Comment: comment,
Query: q,
Vars: vars,
}
return nil
}
func (al *List) Load() ([]Item, error) {
var list []Item
varString := "variables"
b, err := ioutil.ReadFile(al.filepath)
if err != nil {
return list, err
}
if len(b) == 0 {
return list, nil
}
var comment bytes.Buffer
var varBytes []byte
itemMap := make(map[string]struct{})
s, e, c := 0, 0, 0
ty := 0
for {
fq := false
if c == 0 && b[e] == '#' {
s = e
for e < len(b) && b[e] != '\n' {
e++
}
if (e - s) > 2 {
comment.Write(b[(s + 1):(e + 1)])
}
}
if e >= len(b) {
break
}
if matchPrefix(b, e, "query") || matchPrefix(b, e, "mutation") {
if c == 0 {
s = e
}
ty = AL_QUERY
} else if matchPrefix(b, e, varString) {
if c == 0 {
s = e + len(varString) + 1
}
ty = AL_VARS
} else if b[e] == '{' {
c++
} else if b[e] == '}' {
c--
if c == 0 {
if ty == AL_QUERY {
fq = true
} else if ty == AL_VARS {
varBytes = b[s:(e + 1)]
}
ty = 0
}
}
if fq {
query := string(b[s:(e + 1)])
name := QueryName(query)
key := strings.ToLower(name)
if _, ok := itemMap[key]; !ok {
v := Item{
Name: name,
key: key,
Query: query,
Vars: varBytes,
Comment: comment.String(),
}
list = append(list, v)
comment.Reset()
}
varBytes = nil
}
e++
if e >= len(b) {
break
}
}
return list, nil
}
func (al *List) save(item Item) error {
var buf bytes.Buffer
qd := &schema.QueryDocument{}
if err := qd.Parse(item.Query); err != nil {
return err
}
qd.WriteTo(&buf)
query := buf.String()
buf.Reset()
item.Name = QueryName(query)
item.key = strings.ToLower(item.Name)
if item.Name == "" {
return nil
}
list, err := al.Load()
if err != nil {
return err
}
index := -1
for i, v := range list {
if strings.EqualFold(v.Name, item.Name) {
index = i
break
}
}
if index != -1 {
if list[index].Comment != "" {
item.Comment = list[index].Comment
}
list[index] = item
} else {
list = append(list, item)
}
f, err := os.Create(al.filepath)
if err != nil {
return err
}
defer f.Close()
sort.Slice(list, func(i, j int) bool {
return strings.Compare(list[i].key, list[j].key) == -1
})
for _, v := range list {
cmtLines := strings.Split(v.Comment, "\n")
i := 0
for _, c := range cmtLines {
if c = strings.TrimSpace(c); c == "" {
continue
}
_, err := f.WriteString(fmt.Sprintf("# %s\n", c))
if err != nil {
return err
}
i++
}
if i != 0 {
if _, err := f.WriteString("\n"); err != nil {
return err
}
} else {
if _, err := f.WriteString(fmt.Sprintf("# Query named %s\n\n", v.Name)); err != nil {
return err
}
}
if len(v.Vars) != 0 && !bytes.Equal(v.Vars, []byte("{}")) {
buf.Reset()
if err := jsn.Clear(&buf, v.Vars); err != nil {
return fmt.Errorf("failed to clean vars: %w", err)
}
vj := json.RawMessage(buf.Bytes())
vj, err = json.MarshalIndent(vj, "", " ")
if err != nil {
return fmt.Errorf("failed to marshal vars: %w", err)
}
_, err = f.WriteString(fmt.Sprintf("variables %s\n\n", vj))
if err != nil {
return err
}
}
if v.Query[0] == '{' {
_, err = f.WriteString(fmt.Sprintf("query %s\n\n", v.Query))
} else {
_, err = f.WriteString(fmt.Sprintf("%s\n\n", v.Query))
}
if err != nil {
return err
}
}
return nil
}
func matchPrefix(b []byte, i int, s string) bool {
if (len(b) - i) < len(s) {
return false
}
for n := 0; n < len(s); n++ {
if b[(i+n)] != s[n] {
return false
}
}
return true
}
func QueryName(b string) string {
state, s := 0, 0
for i := 0; i < len(b); i++ {
switch {
case state == 2 && !isValidNameChar(b[i]):
return b[s:i]
case state == 1 && b[i] == '{':
return ""
case state == 1 && isValidNameChar(b[i]):
s = i
state = 2
case i != 0 && b[i] == ' ' && (b[i-1] == 'n' || b[i-1] == 'y'):
state = 1
}
}
return ""
}
func isValidNameChar(c byte) bool {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_'
}