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package azblob
import (
"net"
"net/url"
"strings"
"time"
)
// SASVersion indicates the SAS version.
const SASVersion = ServiceVersion
type SASProtocol string
const (
// SASProtocolHTTPS can be specified for a SAS protocol
SASProtocolHTTPS SASProtocol = "https"
// SASProtocolHTTPSandHTTP can be specified for a SAS protocol
SASProtocolHTTPSandHTTP SASProtocol = "https,http"
)
// FormatTimesForSASSigning converts a time.Time to a snapshotTimeFormat string suitable for a
// SASField's StartTime or ExpiryTime fields. Returns "" if value.IsZero().
func FormatTimesForSASSigning(startTime, expiryTime time.Time) (string, string) {
ss := ""
if !startTime.IsZero() {
ss = startTime.Format(SASTimeFormat) // "yyyy-MM-ddTHH:mm:ssZ"
}
se := ""
if !expiryTime.IsZero() {
se = expiryTime.Format(SASTimeFormat) // "yyyy-MM-ddTHH:mm:ssZ"
}
return ss, se
}
// SASTimeFormat represents the format of a SAS start or expiry time. Use it when formatting/parsing a time.Time.
const SASTimeFormat = "2006-01-02T15:04:05Z" //"2017-07-27T00:00:00Z" // ISO 8601
// https://docs.microsoft.com/en-us/rest/api/storageservices/constructing-a-service-sas
// A SASQueryParameters object represents the components that make up an Azure Storage SAS' query parameters.
// You parse a map of query parameters into its fields by calling NewSASQueryParameters(). You add the components
// to a query parameter map by calling AddToValues().
// NOTE: Changing any field requires computing a new SAS signature using a XxxSASSignatureValues type.
//
// This type defines the components used by all Azure Storage resources (Containers, Blobs, Files, & Queues).
type SASQueryParameters struct {
// All members are immutable or values so copies of this struct are goroutine-safe.
version string `param:"sv"`
services string `param:"ss"`
resourceTypes string `param:"srt"`
protocol SASProtocol `param:"spr"`
startTime time.Time `param:"st"`
expiryTime time.Time `param:"se"`
ipRange IPRange `param:"sip"`
identifier string `param:"si"`
resource string `param:"sr"`
permissions string `param:"sp"`
signature string `param:"sig"`
}
func (p *SASQueryParameters) Version() string {
return p.version
}
func (p *SASQueryParameters) Services() string {
return p.services
}
func (p *SASQueryParameters) ResourceTypes() string {
return p.resourceTypes
}
func (p *SASQueryParameters) Protocol() SASProtocol {
return p.protocol
}
func (p *SASQueryParameters) StartTime() time.Time {
return p.startTime
}
func (p *SASQueryParameters) ExpiryTime() time.Time {
return p.expiryTime
}
func (p *SASQueryParameters) IPRange() IPRange {
return p.ipRange
}
func (p *SASQueryParameters) Identifier() string {
return p.identifier
}
func (p *SASQueryParameters) Resource() string {
return p.resource
}
func (p *SASQueryParameters) Permissions() string {
return p.permissions
}
func (p *SASQueryParameters) Signature() string {
return p.signature
}
// IPRange represents a SAS IP range's start IP and (optionally) end IP.
type IPRange struct {
Start net.IP // Not specified if length = 0
End net.IP // Not specified if length = 0
}
// String returns a string representation of an IPRange.
func (ipr *IPRange) String() string {
if len(ipr.Start) == 0 {
return ""
}
start := ipr.Start.String()
if len(ipr.End) == 0 {
return start
}
return start + "-" + ipr.End.String()
}
// NewSASQueryParameters creates and initializes a SASQueryParameters object based on the
// query parameter map's passed-in values. If deleteSASParametersFromValues is true,
// all SAS-related query parameters are removed from the passed-in map. If
// deleteSASParametersFromValues is false, the map passed-in map is unaltered.
func newSASQueryParameters(values url.Values, deleteSASParametersFromValues bool) SASQueryParameters {
p := SASQueryParameters{}
for k, v := range values {
val := v[0]
isSASKey := true
switch strings.ToLower(k) {
case "sv":
p.version = val
case "ss":
p.services = val
case "srt":
p.resourceTypes = val
case "spr":
p.protocol = SASProtocol(val)
case "st":
p.startTime, _ = time.Parse(SASTimeFormat, val)
case "se":
p.expiryTime, _ = time.Parse(SASTimeFormat, val)
case "sip":
dashIndex := strings.Index(val, "-")
if dashIndex == -1 {
p.ipRange.Start = net.ParseIP(val)
} else {
p.ipRange.Start = net.ParseIP(val[:dashIndex])
p.ipRange.End = net.ParseIP(val[dashIndex+1:])
}
case "si":
p.identifier = val
case "sr":
p.resource = val
case "sp":
p.permissions = val
case "sig":
p.signature = val
default:
isSASKey = false // We didn't recognize the query parameter
}
if isSASKey && deleteSASParametersFromValues {
delete(values, k)
}
}
return p
}
// AddToValues adds the SAS components to the specified query parameters map.
func (p *SASQueryParameters) addToValues(v url.Values) url.Values {
if p.version != "" {
v.Add("sv", p.version)
}
if p.services != "" {
v.Add("ss", p.services)
}
if p.resourceTypes != "" {
v.Add("srt", p.resourceTypes)
}
if p.protocol != "" {
v.Add("spr", string(p.protocol))
}
if !p.startTime.IsZero() {
v.Add("st", p.startTime.Format(SASTimeFormat))
}
if !p.expiryTime.IsZero() {
v.Add("se", p.expiryTime.Format(SASTimeFormat))
}
if len(p.ipRange.Start) > 0 {
v.Add("sip", p.ipRange.String())
}
if p.identifier != "" {
v.Add("si", p.identifier)
}
if p.resource != "" {
v.Add("sr", p.resource)
}
if p.permissions != "" {
v.Add("sp", p.permissions)
}
if p.signature != "" {
v.Add("sig", p.signature)
}
return v
}
// Encode encodes the SAS query parameters into URL encoded form sorted by key.
func (p *SASQueryParameters) Encode() string {
v := url.Values{}
p.addToValues(v)
return v.Encode()
}
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