127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
/*
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Copyright 2023 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sqlserver
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import (
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"context"
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"errors"
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"fmt"
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"unicode"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
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mssql "github.com/microsoft/go-mssqldb"
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"github.com/microsoft/go-mssqldb/msdsn"
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"github.com/dapr/components-contrib/common/authentication/azure"
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)
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// SQLServerAuthMetadata contains the auth metadata for a SQL Server component.
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type SQLServerAuthMetadata struct {
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ConnectionString string `mapstructure:"connectionString" mapstructurealiases:"url"`
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DatabaseName string `mapstructure:"databaseName" mapstructurealiases:"database"`
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SchemaName string `mapstructure:"schemaName" mapstructurealiases:"schema"`
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UseAzureAD bool `mapstructure:"useAzureAD"`
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azureEnv azure.EnvironmentSettings
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}
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// Reset the object
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func (m *SQLServerAuthMetadata) Reset() {
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m.ConnectionString = ""
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m.DatabaseName = "dapr"
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m.SchemaName = "dbo"
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m.UseAzureAD = false
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}
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// Validate the auth metadata and returns an error if it's not valid.
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func (m *SQLServerAuthMetadata) Validate(meta map[string]string) (err error) {
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// Validate and sanitize input
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if m.ConnectionString == "" {
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return errors.New("missing connection string")
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}
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if !IsValidSQLName(m.DatabaseName) {
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return errors.New("invalid database name, accepted characters are (A-Z, a-z, 0-9, _)")
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}
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if !IsValidSQLName(m.SchemaName) {
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return errors.New("invalid schema name, accepted characters are (A-Z, a-z, 0-9, _)")
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}
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// If using Azure AD
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if m.UseAzureAD {
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m.azureEnv, err = azure.NewEnvironmentSettings(meta)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// GetConnector returns the connector from the connection string or Azure AD.
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// The returned connector can be used with sql.OpenDB.
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func (m *SQLServerAuthMetadata) GetConnector(setDatabase bool) (*mssql.Connector, bool, error) {
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// Parse the connection string
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config, err := msdsn.Parse(m.ConnectionString)
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if err != nil {
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return nil, false, fmt.Errorf("failed to parse connection string: %w", err)
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}
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// If setDatabase is true and the configuration (i.e. the connection string) does not contain a database, add it
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// This is for backwards-compatibility reasons
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if setDatabase && config.Database == "" {
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config.Database = m.DatabaseName
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}
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// We need to check if the configuration has a database because the migrator needs it
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hasDatabase := config.Database != ""
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// Configure Azure AD authentication if needed
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if m.UseAzureAD {
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tokenCred, errToken := m.azureEnv.GetTokenCredential()
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if errToken != nil {
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return nil, false, errToken
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}
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conn, err := mssql.NewSecurityTokenConnector(config, func(ctx context.Context) (string, error) {
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at, err := tokenCred.GetToken(ctx, policy.TokenRequestOptions{
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Scopes: []string{
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m.azureEnv.Cloud.Services[azure.ServiceAzureSQL].Audience + "/.default",
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},
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})
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if err != nil {
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return "", err
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}
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return at.Token, nil
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})
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return conn, hasDatabase, err
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}
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conn := mssql.NewConnectorConfig(config)
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return conn, hasDatabase, nil
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}
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func IsLetterOrNumber(c rune) bool {
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return unicode.IsNumber(c) || unicode.IsLetter(c)
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}
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func IsValidSQLName(s string) bool {
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for _, c := range s {
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if !(IsLetterOrNumber(c) || (c == '_')) {
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return false
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}
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}
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return true
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}
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