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go-ethereum/vendor/github.com/Azure/azure-storage-go/table.go

254 lines
6.7 KiB

package storage
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"time"
)
// AzureTable is the typedef of the Azure Table name
type AzureTable string
const (
tablesURIPath = "/Tables"
)
type createTableRequest struct {
TableName string `json:"TableName"`
}
// TableAccessPolicy are used for SETTING table policies
type TableAccessPolicy struct {
ID string
StartTime time.Time
ExpiryTime time.Time
CanRead bool
CanAppend bool
CanUpdate bool
CanDelete bool
}
func pathForTable(table AzureTable) string { return fmt.Sprintf("%s", table) }
func (c *TableServiceClient) getStandardHeaders() map[string]string {
return map[string]string{
"x-ms-version": "2015-02-21",
"x-ms-date": currentTimeRfc1123Formatted(),
"Accept": "application/json;odata=nometadata",
"Accept-Charset": "UTF-8",
"Content-Type": "application/json",
userAgentHeader: c.client.userAgent,
}
}
// QueryTables returns the tables created in the
// *TableServiceClient storage account.
func (c *TableServiceClient) QueryTables() ([]AzureTable, error) {
uri := c.client.getEndpoint(tableServiceName, tablesURIPath, url.Values{})
headers := c.getStandardHeaders()
headers["Content-Length"] = "0"
resp, err := c.client.execInternalJSON(http.MethodGet, uri, headers, nil, c.auth)
if err != nil {
return nil, err
}
defer resp.body.Close()
if err := checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
ioutil.ReadAll(resp.body)
return nil, err
}
buf := new(bytes.Buffer)
if _, err := buf.ReadFrom(resp.body); err != nil {
return nil, err
}
var respArray queryTablesResponse
if err := json.Unmarshal(buf.Bytes(), &respArray); err != nil {
return nil, err
}
s := make([]AzureTable, len(respArray.TableName))
for i, elem := range respArray.TableName {
s[i] = AzureTable(elem.TableName)
}
return s, nil
}
// CreateTable creates the table given the specific
// name. This function fails if the name is not compliant
// with the specification or the tables already exists.
func (c *TableServiceClient) CreateTable(table AzureTable) error {
uri := c.client.getEndpoint(tableServiceName, tablesURIPath, url.Values{})
headers := c.getStandardHeaders()
req := createTableRequest{TableName: string(table)}
buf := new(bytes.Buffer)
if err := json.NewEncoder(buf).Encode(req); err != nil {
return err
}
headers["Content-Length"] = fmt.Sprintf("%d", buf.Len())
resp, err := c.client.execInternalJSON(http.MethodPost, uri, headers, buf, c.auth)
if err != nil {
return err
}
defer readAndCloseBody(resp.body)
if err := checkRespCode(resp.statusCode, []int{http.StatusCreated}); err != nil {
return err
}
return nil
}
// DeleteTable deletes the table given the specific
// name. This function fails if the table is not present.
// Be advised: DeleteTable deletes all the entries
// that may be present.
func (c *TableServiceClient) DeleteTable(table AzureTable) error {
uri := c.client.getEndpoint(tableServiceName, tablesURIPath, url.Values{})
uri += fmt.Sprintf("('%s')", string(table))
headers := c.getStandardHeaders()
headers["Content-Length"] = "0"
resp, err := c.client.execInternalJSON(http.MethodDelete, uri, headers, nil, c.auth)
if err != nil {
return err
}
defer readAndCloseBody(resp.body)
if err := checkRespCode(resp.statusCode, []int{http.StatusNoContent}); err != nil {
return err
}
return nil
}
// SetTablePermissions sets up table ACL permissions as per REST details https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Set-Table-ACL
func (c *TableServiceClient) SetTablePermissions(table AzureTable, policies []TableAccessPolicy, timeout uint) (err error) {
params := url.Values{"comp": {"acl"}}
if timeout > 0 {
params.Add("timeout", fmt.Sprint(timeout))
}
uri := c.client.getEndpoint(tableServiceName, string(table), params)
headers := c.client.getStandardHeaders()
body, length, err := generateTableACLPayload(policies)
if err != nil {
return err
}
headers["Content-Length"] = fmt.Sprintf("%v", length)
resp, err := c.client.execInternalJSON(http.MethodPut, uri, headers, body, c.auth)
if err != nil {
return err
}
defer readAndCloseBody(resp.body)
if err := checkRespCode(resp.statusCode, []int{http.StatusNoContent}); err != nil {
return err
}
return nil
}
func generateTableACLPayload(policies []TableAccessPolicy) (io.Reader, int, error) {
sil := SignedIdentifiers{
SignedIdentifiers: []SignedIdentifier{},
}
for _, tap := range policies {
permission := generateTablePermissions(&tap)
signedIdentifier := convertAccessPolicyToXMLStructs(tap.ID, tap.StartTime, tap.ExpiryTime, permission)
sil.SignedIdentifiers = append(sil.SignedIdentifiers, signedIdentifier)
}
return xmlMarshal(sil)
}
// GetTablePermissions gets the table ACL permissions, as per REST details https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/get-table-acl
func (c *TableServiceClient) GetTablePermissions(table AzureTable, timeout int) (permissionResponse []TableAccessPolicy, err error) {
params := url.Values{"comp": {"acl"}}
if timeout > 0 {
params.Add("timeout", strconv.Itoa(timeout))
}
uri := c.client.getEndpoint(tableServiceName, string(table), params)
headers := c.client.getStandardHeaders()
resp, err := c.client.execInternalJSON(http.MethodGet, uri, headers, nil, c.auth)
if err != nil {
return nil, err
}
defer resp.body.Close()
if err = checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
ioutil.ReadAll(resp.body)
return nil, err
}
var ap AccessPolicy
err = xmlUnmarshal(resp.body, &ap.SignedIdentifiersList)
if err != nil {
return nil, err
}
out := updateTableAccessPolicy(ap)
return out, nil
}
func updateTableAccessPolicy(ap AccessPolicy) []TableAccessPolicy {
out := []TableAccessPolicy{}
for _, policy := range ap.SignedIdentifiersList.SignedIdentifiers {
tap := TableAccessPolicy{
ID: policy.ID,
StartTime: policy.AccessPolicy.StartTime,
ExpiryTime: policy.AccessPolicy.ExpiryTime,
}
tap.CanRead = updatePermissions(policy.AccessPolicy.Permission, "r")
tap.CanAppend = updatePermissions(policy.AccessPolicy.Permission, "a")
tap.CanUpdate = updatePermissions(policy.AccessPolicy.Permission, "u")
tap.CanDelete = updatePermissions(policy.AccessPolicy.Permission, "d")
out = append(out, tap)
}
return out
}
func generateTablePermissions(tap *TableAccessPolicy) (permissions string) {
// generate the permissions string (raud).
// still want the end user API to have bool flags.
permissions = ""
if tap.CanRead {
permissions += "r"
}
if tap.CanAppend {
permissions += "a"
}
if tap.CanUpdate {
permissions += "u"
}
if tap.CanDelete {
permissions += "d"
}
return permissions
}