forked from dolthub/go-mysql-server
/
show_grants.go
222 lines (199 loc) · 6.06 KB
/
show_grants.go
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// Copyright 2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package plan
import (
"fmt"
"strings"
"github.com/gabereiser/go-mysql-server/sql/mysql_db"
"github.com/gabereiser/go-mysql-server/sql/types"
"github.com/gabereiser/go-mysql-server/sql"
)
// ShowGrants represents the statement SHOW GRANTS.
type ShowGrants struct {
CurrentUser bool
For *UserName
Using []UserName
MySQLDb sql.Database
}
var _ sql.Node = (*ShowGrants)(nil)
var _ sql.Databaser = (*ShowGrants)(nil)
// NewShowGrants returns a new ShowGrants node.
func NewShowGrants(currentUser bool, targetUser *UserName, using []UserName) *ShowGrants {
return &ShowGrants{
CurrentUser: currentUser,
For: targetUser,
Using: using,
MySQLDb: sql.UnresolvedDatabase("mysql"),
}
}
// Schema implements the interface sql.Node.
func (n *ShowGrants) Schema() sql.Schema {
user := n.For
if user == nil {
user = &UserName{
Name: "root",
Host: "localhost",
AnyHost: true,
}
}
return sql.Schema{{
Name: fmt.Sprintf("Grants for %s", user.String("")),
Type: types.LongText,
}}
}
// String implements the interface sql.Node.
func (n *ShowGrants) String() string {
user := n.For
if user == nil {
user = &UserName{
Name: "root",
Host: "localhost",
AnyHost: true,
}
}
return fmt.Sprintf("ShowGrants(%s)", user.String(""))
}
// Database implements the interface sql.Databaser.
func (n *ShowGrants) Database() sql.Database {
return n.MySQLDb
}
// WithDatabase implements the interface sql.Databaser.
func (n *ShowGrants) WithDatabase(db sql.Database) (sql.Node, error) {
nn := *n
nn.MySQLDb = db
return &nn, nil
}
// Resolved implements the interface sql.Node.
func (n *ShowGrants) Resolved() bool {
_, ok := n.MySQLDb.(sql.UnresolvedDatabase)
return !ok
}
// Children implements the interface sql.Node.
func (n *ShowGrants) Children() []sql.Node {
return nil
}
// WithChildren implements the interface sql.Node.
func (n *ShowGrants) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(n, len(children), 0)
}
return n, nil
}
// CheckPrivileges implements the interface sql.Node.
func (n *ShowGrants) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
if n.CurrentUser {
return true
} else {
return opChecker.UserHasPrivileges(ctx,
sql.NewPrivilegedOperation("mysql", "", "", sql.PrivilegeType_Select))
}
}
// generatePrivStrings creates a formatted GRANT <privilege_list> on <global/database/table> to <user@host> string
func generatePrivStrings(db, tbl, user string, privs []sql.PrivilegeType) string {
sb := strings.Builder{}
withGrantOption := ""
for i, priv := range privs {
privStr := priv.String()
if privStr == sql.PrivilegeType_GrantOption.String() {
if len(privs) > 1 {
withGrantOption = " WITH GRANT OPTION"
}
} else {
if i > 0 {
sb.WriteString(", ")
}
sb.WriteString(privStr)
}
}
// handle special case for empty global and database privileges
privStr := sb.String()
if len(privStr) == 0 {
if db == "*" {
privStr = "USAGE"
} else {
return ""
}
}
return fmt.Sprintf("GRANT %s ON %s.%s TO %s%s", privStr, db, tbl, user, withGrantOption)
}
// RowIter implements the interface sql.Node.
func (n *ShowGrants) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
mysqlDb, ok := n.MySQLDb.(*mysql_db.MySQLDb)
if !ok {
return nil, sql.ErrDatabaseNotFound.New("mysql")
}
if n.For == nil || n.CurrentUser {
client := ctx.Session.Client()
n.For = &UserName{
Name: client.User,
Host: client.Address,
}
}
user := mysqlDb.GetUser(n.For.Name, n.For.Host, false)
if user == nil {
return nil, sql.ErrShowGrantsUserDoesNotExist.New(n.For.Name, n.For.Host)
}
//TODO: implement USING, perhaps by creating a new context with the chosen roles set as the active roles
var rows []sql.Row
userStr := user.UserHostToString("`")
privStr := generatePrivStrings("*", "*", userStr, user.PrivilegeSet.ToSlice())
rows = append(rows, sql.Row{privStr})
for _, db := range user.PrivilegeSet.GetDatabases() {
dbStr := fmt.Sprintf("`%s`", db.Name())
if privStr = generatePrivStrings(dbStr, "*", userStr, db.ToSlice()); len(privStr) != 0 {
rows = append(rows, sql.Row{privStr})
}
for _, tbl := range db.GetTables() {
tblStr := fmt.Sprintf("`%s`", tbl.Name())
privStr = generatePrivStrings(dbStr, tblStr, userStr, tbl.ToSlice())
rows = append(rows, sql.Row{privStr})
}
}
// TODO: display column privileges
sb := strings.Builder{}
roleEdges := mysqlDb.RoleEdgesTable().Data().Get(mysql_db.RoleEdgesToKey{
ToHost: user.Host,
ToUser: user.User,
})
for i, roleEdge := range roleEdges {
if i > 0 {
sb.WriteString(", ")
}
sb.WriteString(roleEdge.(*mysql_db.RoleEdge).FromString("`"))
}
if sb.Len() > 0 {
rows = append(rows, sql.Row{fmt.Sprintf("GRANT %s TO %s", sb.String(), user.UserHostToString("`"))})
}
sb.Reset()
for i, dynamicPrivWithWgo := range user.PrivilegeSet.ToSliceDynamic(true) {
if i > 0 {
sb.WriteString(", ")
}
sb.WriteString(dynamicPrivWithWgo)
}
if sb.Len() > 0 {
rows = append(rows, sql.Row{fmt.Sprintf("GRANT %s ON *.* TO %s WITH GRANT OPTION", sb.String(), user.UserHostToString("`"))})
}
sb.Reset()
for i, dynamicPrivWithoutWgo := range user.PrivilegeSet.ToSliceDynamic(false) {
if i > 0 {
sb.WriteString(", ")
}
sb.WriteString(dynamicPrivWithoutWgo)
}
if sb.Len() > 0 {
rows = append(rows, sql.Row{fmt.Sprintf("GRANT %s ON *.* TO %s", sb.String(), user.UserHostToString("`"))})
}
return sql.RowsToRowIter(rows...), nil
}