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package azblob
import (
"bytes"
"fmt"
"strings"
"time"
)
// AccountSASSignatureValues is used to generate a Shared Access Signature (SAS) for an Azure Storage account.
// For more information, see https://docs.microsoft.com/rest/api/storageservices/constructing-an-account-sas
type AccountSASSignatureValues struct {
Version string `param:"sv"` // If not specified, this defaults to SASVersion
Protocol SASProtocol `param:"spr"` // See the SASProtocol* constants
StartTime time.Time `param:"st"` // Not specified if IsZero
ExpiryTime time.Time `param:"se"` // Not specified if IsZero
Permissions string `param:"sp"` // Create by initializing a AccountSASPermissions and then call String()
IPRange IPRange `param:"sip"`
Services string `param:"ss"` // Create by initializing AccountSASServices and then call String()
ResourceTypes string `param:"srt"` // Create by initializing AccountSASResourceTypes and then call String()
}
// NewSASQueryParameters uses an account's shared key credential to sign this signature values to produce
// the proper SAS query parameters.
func (v AccountSASSignatureValues) NewSASQueryParameters(sharedKeyCredential *SharedKeyCredential) SASQueryParameters {
// https://docs.microsoft.com/en-us/rest/api/storageservices/Constructing-an-Account-SAS
if v.ExpiryTime.IsZero() || v.Permissions == "" || v.ResourceTypes == "" || v.Services == "" {
panic("Account SAS is missing at least one of these: ExpiryTime, Permissions, Service, or ResourceType")
}
if v.Version == "" {
v.Version = SASVersion
}
perms := &AccountSASPermissions{}
if err := perms.Parse(v.Permissions); err != nil {
panic(err)
}
v.Permissions = perms.String()
startTime, expiryTime := FormatTimesForSASSigning(v.StartTime, v.ExpiryTime)
stringToSign := strings.Join([]string{
sharedKeyCredential.AccountName(),
v.Permissions,
v.Services,
v.ResourceTypes,
startTime,
expiryTime,
v.IPRange.String(),
string(v.Protocol),
v.Version,
""}, // That right, the account SAS requires a terminating extra newline
"\n")
signature := sharedKeyCredential.ComputeHMACSHA256(stringToSign)
p := SASQueryParameters{
// Common SAS parameters
version: v.Version,
protocol: v.Protocol,
startTime: v.StartTime,
expiryTime: v.ExpiryTime,
permissions: v.Permissions,
ipRange: v.IPRange,
// Account-specific SAS parameters
services: v.Services,
resourceTypes: v.ResourceTypes,
// Calculated SAS signature
signature: signature,
}
return p
}
// The AccountSASPermissions type simplifies creating the permissions string for an Azure Storage Account SAS.
// Initialize an instance of this type and then call its String method to set AccountSASSignatureValues's Permissions field.
type AccountSASPermissions struct {
Read, Write, Delete, List, Add, Create, Update, Process bool
}
// String produces the SAS permissions string for an Azure Storage account.
// Call this method to set AccountSASSignatureValues's Permissions field.
func (p AccountSASPermissions) String() string {
var buffer bytes.Buffer
if p.Read {
buffer.WriteRune('r')
}
if p.Write {
buffer.WriteRune('w')
}
if p.Delete {
buffer.WriteRune('d')
}
if p.List {
buffer.WriteRune('l')
}
if p.Add {
buffer.WriteRune('a')
}
if p.Create {
buffer.WriteRune('c')
}
if p.Update {
buffer.WriteRune('u')
}
if p.Process {
buffer.WriteRune('p')
}
return buffer.String()
}
// Parse initializes the AccountSASPermissions's fields from a string.
func (p *AccountSASPermissions) Parse(s string) error {
*p = AccountSASPermissions{} // Clear out the flags
for _, r := range s {
switch r {
case 'r':
p.Read = true
case 'w':
p.Write = true
case 'd':
p.Delete = true
case 'l':
p.List = true
case 'a':
p.Add = true
case 'c':
p.Create = true
case 'u':
p.Update = true
case 'p':
p.Process = true
default:
return fmt.Errorf("Invalid permission character: '%v'", r)
}
}
return nil
}
// The AccountSASServices type simplifies creating the services string for an Azure Storage Account SAS.
// Initialize an instance of this type and then call its String method to set AccountSASSignatureValues's Services field.
type AccountSASServices struct {
Blob, Queue, File bool
}
// String produces the SAS services string for an Azure Storage account.
// Call this method to set AccountSASSignatureValues's Services field.
func (s AccountSASServices) String() string {
var buffer bytes.Buffer
if s.Blob {
buffer.WriteRune('b')
}
if s.Queue {
buffer.WriteRune('q')
}
if s.File {
buffer.WriteRune('f')
}
return buffer.String()
}
// Parse initializes the AccountSASServices' fields from a string.
func (a *AccountSASServices) Parse(s string) error {
*a = AccountSASServices{} // Clear out the flags
for _, r := range s {
switch r {
case 'b':
a.Blob = true
case 'q':
a.Queue = true
case 'f':
a.File = true
default:
return fmt.Errorf("Invalid service character: '%v'", r)
}
}
return nil
}
// The AccountSASResourceTypes type simplifies creating the resource types string for an Azure Storage Account SAS.
// Initialize an instance of this type and then call its String method to set AccountSASSignatureValues's ResourceTypes field.
type AccountSASResourceTypes struct {
Service, Container, Object bool
}
// String produces the SAS resource types string for an Azure Storage account.
// Call this method to set AccountSASSignatureValues's ResourceTypes field.
func (rt AccountSASResourceTypes) String() string {
var buffer bytes.Buffer
if rt.Service {
buffer.WriteRune('s')
}
if rt.Container {
buffer.WriteRune('c')
}
if rt.Object {
buffer.WriteRune('o')
}
return buffer.String()
}
// Parse initializes the AccountSASResourceType's fields from a string.
func (rt *AccountSASResourceTypes) Parse(s string) error {
*rt = AccountSASResourceTypes{} // Clear out the flags
for _, r := range s {
switch r {
case 's':
rt.Service = true
case 'q':
rt.Container = true
case 'o':
rt.Object = true
default:
return fmt.Errorf("Invalid resource type: '%v'", r)
}
}
return nil
}
|
