super-graph/core/prepare.go

171 lines
3.3 KiB
Go

package core
import (
"bytes"
"database/sql"
"fmt"
"hash/maphash"
"io"
"strings"
"sync"
"github.com/dosco/super-graph/core/internal/allow"
"github.com/dosco/super-graph/core/internal/qcode"
)
type query struct {
sync.Once
sd *sql.Stmt
ai allow.Item
qt qcode.QType
err error
st stmt
roleArg bool
}
func (sg *SuperGraph) prepare(q *query, role string) {
var stmts []stmt
var err error
qb := []byte(q.ai.Query)
switch q.qt {
case qcode.QTQuery:
if sg.abacEnabled {
stmts, err = sg.buildMultiStmt(qb, q.ai.Vars)
} else {
stmts, err = sg.buildRoleStmt(qb, q.ai.Vars, role)
}
case qcode.QTMutation:
stmts, err = sg.buildRoleStmt(qb, q.ai.Vars, role)
}
if err != nil {
sg.log.Printf("WRN %s %s: %v", q.qt, q.ai.Name, err)
}
q.st = stmts[0]
q.roleArg = len(stmts) > 1
q.sd, err = sg.db.Prepare(q.st.sql)
if err != nil {
q.err = fmt.Errorf("prepare failed: %v: %s", err, q.st.sql)
}
}
func (sg *SuperGraph) initPrepared() error {
if sg.allowList.IsPersist() {
return nil
}
if err := sg.prepareRoleStmt(); err != nil {
return fmt.Errorf("role query: %w", err)
}
sg.queries = make(map[uint64]query)
list, err := sg.allowList.Load()
if err != nil {
return err
}
h := maphash.Hash{}
h.SetSeed(sg.hashSeed)
for _, v := range list {
if len(v.Query) == 0 {
continue
}
qt := qcode.GetQType(v.Query)
switch qt {
case qcode.QTQuery:
sg.queries[queryID(&h, v.Name, "user")] = query{ai: v, qt: qt}
if sg.anonExists {
sg.queries[queryID(&h, v.Name, "anon")] = query{ai: v, qt: qt}
}
case qcode.QTMutation:
for _, role := range sg.conf.Roles {
sg.queries[queryID(&h, v.Name, role.Name)] = query{ai: v, qt: qt}
}
}
}
return nil
}
// nolint: errcheck
func (sg *SuperGraph) prepareRoleStmt() error {
var err error
if !sg.abacEnabled {
return nil
}
rq := strings.ReplaceAll(sg.conf.RolesQuery, "$user_id", "$1")
w := &bytes.Buffer{}
io.WriteString(w, `SELECT (CASE WHEN EXISTS (`)
io.WriteString(w, rq)
io.WriteString(w, `) THEN `)
io.WriteString(w, `(SELECT (CASE`)
for _, role := range sg.conf.Roles {
if len(role.Match) == 0 {
continue
}
io.WriteString(w, ` WHEN `)
io.WriteString(w, role.Match)
io.WriteString(w, ` THEN '`)
io.WriteString(w, role.Name)
io.WriteString(w, `'`)
}
io.WriteString(w, ` ELSE $2 END) FROM (`)
io.WriteString(w, rq)
io.WriteString(w, `) AS "_sg_auth_roles_query" LIMIT 1) `)
io.WriteString(w, `ELSE 'anon' END) FROM (VALUES (1)) AS "_sg_auth_filler" LIMIT 1; `)
sg.getRole, err = sg.db.Prepare(w.String())
if err != nil {
return err
}
return nil
}
func (sg *SuperGraph) initAllowList() error {
var ac allow.Config
var err error
if sg.conf.AllowListFile == "" {
sg.conf.AllowListFile = "allow.list"
}
// When list is not eabled it is still created and
// and new queries are saved to it.
if !sg.conf.UseAllowList {
ac = allow.Config{CreateIfNotExists: true, Persist: true, Log: sg.log}
}
sg.allowList, err = allow.New(sg.conf.AllowListFile, ac)
if err != nil {
return fmt.Errorf("failed to initialize allow list: %w", err)
}
return nil
}
// nolint: errcheck
func queryID(h *maphash.Hash, name string, role string) uint64 {
h.WriteString(name)
h.WriteString(role)
v := h.Sum64()
h.Reset()
return v
}