super-graph/serv/allow.go

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package serv
import (
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"encoding/json"
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"fmt"
"io/ioutil"
"log"
"os"
"sort"
"strings"
)
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const (
AL_QUERY int = iota + 1
AL_VARS
)
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type allowItem struct {
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uri string
gql string
vars json.RawMessage
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}
var _allowList allowList
type allowList struct {
list map[string]*allowItem
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filepath string
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saveChan chan *allowItem
}
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func initAllowList(path string) {
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_allowList = allowList{
list: make(map[string]*allowItem),
saveChan: make(chan *allowItem),
}
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if len(path) != 0 {
fp := fmt.Sprintf("%s/allow.list", path)
if _, err := os.Stat(fp); err == nil {
_allowList.filepath = fp
} else if !os.IsNotExist(err) {
panic(err)
}
}
if len(_allowList.filepath) == 0 {
fp := "./allow.list"
if _, err := os.Stat(fp); err == nil {
_allowList.filepath = fp
} else if !os.IsNotExist(err) {
panic(err)
}
}
if len(_allowList.filepath) == 0 {
fp := "./config/allow.list"
if _, err := os.Stat(fp); err == nil {
_allowList.filepath = fp
} else if !os.IsNotExist(err) {
panic(err)
}
}
if len(_allowList.filepath) == 0 {
panic("allow.list not found")
}
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_allowList.load()
go func() {
for v := range _allowList.saveChan {
_allowList.save(v)
}
}()
}
func (al *allowList) add(req *gqlReq) {
if len(req.ref) == 0 || len(req.Query) == 0 {
return
}
al.saveChan <- &allowItem{
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uri: req.ref,
gql: req.Query,
vars: req.Vars,
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}
}
func (al *allowList) load() {
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b, err := ioutil.ReadFile(al.filepath)
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if err != nil {
log.Fatal(err)
}
if len(b) == 0 {
return
}
var uri string
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var varBytes []byte
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s, e, c := 0, 0, 0
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ty := 0
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for {
if c == 0 && b[e] == '#' {
s = e
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for e < len(b) && b[e] != '\n' {
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e++
}
if (e - s) > 2 {
uri = strings.TrimSpace(string(b[(s + 1):e]))
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}
}
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if e >= len(b) {
break
}
if matchPrefix(b, e, "query") || matchPrefix(b, e, "mutation") {
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if c == 0 {
s = e
}
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ty = AL_QUERY
} else if matchPrefix(b, e, "variables") {
if c == 0 {
s = e + len("variables") + 1
}
ty = AL_VARS
} else if b[e] == '{' {
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c++
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} else if b[e] == '}' {
c--
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if c == 0 {
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if ty == AL_QUERY {
q := string(b[s:(e + 1)])
item := &allowItem{
uri: uri,
gql: q,
}
if len(varBytes) != 0 {
item.vars = varBytes
}
al.list[gqlHash(q, varBytes)] = item
varBytes = nil
} else if ty == AL_VARS {
varBytes = b[s:(e + 1)]
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}
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ty = 0
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}
}
e++
if e >= len(b) {
break
}
}
}
func (al *allowList) save(item *allowItem) {
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al.list[gqlHash(item.gql, item.vars)] = item
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f, err := os.Create(al.filepath)
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if err != nil {
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logger.Warn().Err(err).Msg("Failed to write allow list to file")
return
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}
defer f.Close()
keys := []string{}
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urlMap := make(map[string][]*allowItem)
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for _, v := range al.list {
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urlMap[v.uri] = append(urlMap[v.uri], v)
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}
for k := range urlMap {
keys = append(keys, k)
}
sort.Strings(keys)
for i := range keys {
k := keys[i]
v := urlMap[k]
f.WriteString(fmt.Sprintf("# %s\n\n", k))
for i := range v {
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if len(v[i].vars) != 0 {
vj, err := json.MarshalIndent(v[i].vars, "", "\t")
if err != nil {
logger.Warn().Err(err).Msg("Failed to write allow list 'vars' to file")
continue
}
f.WriteString(fmt.Sprintf("variables %s\n\n", vj))
}
f.WriteString(fmt.Sprintf("%s\n\n", v[i].gql))
}
}
}
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
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}
}
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return true
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}