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// Copyright 2012 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package syscall

import (
        "unsafe"
)

const (
        STANDARD_RIGHTS_REQUIRED = 0xf0000
        STANDARD_RIGHTS_READ     = 0x20000
        STANDARD_RIGHTS_WRITE    = 0x20000
        STANDARD_RIGHTS_EXECUTE  = 0x20000
        STANDARD_RIGHTS_ALL      = 0x1F0000
)

const (
        NameUnknown          = 0
        NameFullyQualifiedDN = 1
        NameSamCompatible    = 2
        NameDisplay          = 3
        NameUniqueId         = 6
        NameCanonical        = 7
        NameUserPrincipal    = 8
        NameCanonicalEx      = 9
        NameServicePrincipal = 10
        NameDnsDomain        = 12
)

// This function returns 1 byte BOOLEAN rather than the 4 byte BOOL.
// http://blogs.msdn.com/b/drnick/archive/2007/12/19/windows-and-upn-format-credentials.aspx
//sys   TranslateName(accName *uint16, accNameFormat uint32, desiredNameFormat uint32, translatedName *uint16, nSize *uint32) (err error) [failretval&0xff==0] = secur32.TranslateNameW
//sys   GetUserNameEx(nameFormat uint32, nameBuffre *uint16, nSize *uint32) (err error) [failretval&0xff==0] = secur32.GetUserNameExW

// TranslateAccountName converts a directory service
// object name from one format to another.
func TranslateAccountName(username string, from, to uint32, initSize int) (string, error) {
        u := StringToUTF16Ptr(username)
        b := make([]uint16, 50)
        n := uint32(len(b))
        e := TranslateName(u, from, to, &b[0], &n)
        if e != nil {
                if e != ERROR_INSUFFICIENT_BUFFER {
                        return "", e
                }
                // make receive buffers of requested size and try again
                b = make([]uint16, n)
                e = TranslateName(u, from, to, &b[0], &n)
                if e != nil {
                        return "", e
                }
        }
        return UTF16ToString(b), nil
}

type UserInfo10 struct {
        Name       *uint16
        Comment    *uint16
        UsrComment *uint16
        FullName   *uint16
}

//sys   NetUserGetInfo(serverName *uint16, userName *uint16, level uint32, buf **byte) (neterr error) = netapi32.NetUserGetInfo
//sys   NetApiBufferFree(buf *byte) (neterr error) = netapi32.NetApiBufferFree

const (
        // do not reorder
        SidTypeUser = 1 << iota
        SidTypeGroup
        SidTypeDomain
        SidTypeAlias
        SidTypeWellKnownGroup
        SidTypeDeletedAccount
        SidTypeInvalid
        SidTypeUnknown
        SidTypeComputer
        SidTypeLabel
)

//sys   LookupAccountSid(systemName *uint16, sid *SID, name *uint16, nameLen *uint32, refdDomainName *uint16, refdDomainNameLen *uint32, use *uint32) (err error) = advapi32.LookupAccountSidW
//sys   LookupAccountName(systemName *uint16, accountName *uint16, sid *SID, sidLen *uint32, refdDomainName *uint16, refdDomainNameLen *uint32, use *uint32) (err error) = advapi32.LookupAccountNameW
//sys   ConvertSidToStringSid(sid *SID, stringSid **uint16) (err error) = advapi32.ConvertSidToStringSidW
//sys   ConvertStringSidToSid(stringSid *uint16, sid **SID) (err error) = advapi32.ConvertStringSidToSidW
//sys   GetLengthSid(sid *SID) (len uint32) = advapi32.GetLengthSid
//sys   CopySid(destSidLen uint32, destSid *SID, srcSid *SID) (err error) = advapi32.CopySid

// The security identifier (SID) structure is a variable-length
// structure used to uniquely identify users or groups.
type SID struct{}

// StringToSid converts a string-format security identifier
// sid into a valid, functional sid.
func StringToSid(s string) (*SID, error) {
        var sid *SID
        e := ConvertStringSidToSid(StringToUTF16Ptr(s), &sid)
        if e != nil {
                return nil, e
        }
        defer LocalFree((Handle)(unsafe.Pointer(sid)))
        return sid.Copy()
}

// LookupSID retrieves a security identifier sid for the account
// and the name of the domain on which the account was found.
// System specify target computer to search.
func LookupSID(system, account string) (sid *SID, domain string, accType uint32, err error) {
        if len(account) == 0 {
                return nil, "", 0, EINVAL
        }
        acc := StringToUTF16Ptr(account)
        var sys *uint16
        if len(system) > 0 {
                sys = StringToUTF16Ptr(system)
        }
        db := make([]uint16, 50)
        dn := uint32(len(db))
        b := make([]byte, 50)
        n := uint32(len(b))
        sid = (*SID)(unsafe.Pointer(&b[0]))
        e := LookupAccountName(sys, acc, sid, &n, &db[0], &dn, &accType)
        if e != nil {
                if e != ERROR_INSUFFICIENT_BUFFER {
                        return nil, "", 0, e
                }
                // make receive buffers of requested size and try again
                b = make([]byte, n)
                sid = (*SID)(unsafe.Pointer(&b[0]))
                db = make([]uint16, dn)
                e = LookupAccountName(sys, acc, sid, &n, &db[0], &dn, &accType)
                if e != nil {
                        return nil, "", 0, e
                }
        }
        return sid, UTF16ToString(db), accType, nil
}

// String converts sid to a string format
// suitable for display, storage, or transmission.
func (sid *SID) String() (string, error) {
        var s *uint16
        e := ConvertSidToStringSid(sid, &s)
        if e != nil {
                return "", e
        }
        defer LocalFree((Handle)(unsafe.Pointer(s)))
        return UTF16ToString((*[256]uint16)(unsafe.Pointer(s))[:]), nil
}

// Len returns the length, in bytes, of a valid security identifier sid.
func (sid *SID) Len() int {
        return int(GetLengthSid(sid))
}

// Copy creates a duplicate of security identifier sid.
func (sid *SID) Copy() (*SID, error) {
        b := make([]byte, sid.Len())
        sid2 := (*SID)(unsafe.Pointer(&b[0]))
        e := CopySid(uint32(len(b)), sid2, sid)
        if e != nil {
                return nil, e
        }
        return sid2, nil
}

// LookupAccount retrieves the name of the account for this sid
// and the name of the first domain on which this sid is found.
// System specify target computer to search for.
func (sid *SID) LookupAccount(system string) (account, domain string, accType uint32, err error) {
        var sys *uint16
        if len(system) > 0 {
                sys = StringToUTF16Ptr(system)
        }
        b := make([]uint16, 50)
        n := uint32(len(b))
        db := make([]uint16, 50)
        dn := uint32(len(db))
        e := LookupAccountSid(sys, sid, &b[0], &n, &db[0], &dn, &accType)
        if e != nil {
                if e != ERROR_INSUFFICIENT_BUFFER {
                        return "", "", 0, e
                }
                // make receive buffers of requested size and try again
                b = make([]uint16, n)
                db = make([]uint16, dn)
                e = LookupAccountSid(nil, sid, &b[0], &n, &db[0], &dn, &accType)
                if e != nil {
                        return "", "", 0, e
                }
        }
        return UTF16ToString(b), UTF16ToString(db), accType, nil
}

const (
        // do not reorder
        TOKEN_ASSIGN_PRIMARY = 1 << iota
        TOKEN_DUPLICATE
        TOKEN_IMPERSONATE
        TOKEN_QUERY
        TOKEN_QUERY_SOURCE
        TOKEN_ADJUST_PRIVILEGES
        TOKEN_ADJUST_GROUPS
        TOKEN_ADJUST_DEFAULT

        TOKEN_ALL_ACCESS = STANDARD_RIGHTS_REQUIRED |
                TOKEN_ASSIGN_PRIMARY |
                TOKEN_DUPLICATE |
                TOKEN_IMPERSONATE |
                TOKEN_QUERY |
                TOKEN_QUERY_SOURCE |
                TOKEN_ADJUST_PRIVILEGES |
                TOKEN_ADJUST_GROUPS |
                TOKEN_ADJUST_DEFAULT
        TOKEN_READ  = STANDARD_RIGHTS_READ | TOKEN_QUERY
        TOKEN_WRITE = STANDARD_RIGHTS_WRITE |
                TOKEN_ADJUST_PRIVILEGES |
                TOKEN_ADJUST_GROUPS |
                TOKEN_ADJUST_DEFAULT
        TOKEN_EXECUTE = STANDARD_RIGHTS_EXECUTE
)

const (
        // do not reorder
        TokenUser = 1 + iota
        TokenGroups
        TokenPrivileges
        TokenOwner
        TokenPrimaryGroup
        TokenDefaultDacl
        TokenSource
        TokenType
        TokenImpersonationLevel
        TokenStatistics
        TokenRestrictedSids
        TokenSessionId
        TokenGroupsAndPrivileges
        TokenSessionReference
        TokenSandBoxInert
        TokenAuditPolicy
        TokenOrigin
        TokenElevationType
        TokenLinkedToken
        TokenElevation
        TokenHasRestrictions
        TokenAccessInformation
        TokenVirtualizationAllowed
        TokenVirtualizationEnabled
        TokenIntegrityLevel
        TokenUIAccess
        TokenMandatoryPolicy
        TokenLogonSid
        MaxTokenInfoClass
)

type SIDAndAttributes struct {
        Sid        *SID
        Attributes uint32
}

type Tokenuser struct {
        User SIDAndAttributes
}

type Tokenprimarygroup struct {
        PrimaryGroup *SID
}

//sys   OpenProcessToken(h Handle, access uint32, token *Token) (err error) = advapi32.OpenProcessToken
//sys   GetTokenInformation(t Token, infoClass uint32, info *byte, infoLen uint32, returnedLen *uint32) (err error) = advapi32.GetTokenInformation
//sys   GetUserProfileDirectory(t Token, dir *uint16, dirLen *uint32) (err error) = userenv.GetUserProfileDirectoryW

// An access token contains the security information for a logon session.
// The system creates an access token when a user logs on, and every
// process executed on behalf of the user has a copy of the token.
// The token identifies the user, the user's groups, and the user's
// privileges. The system uses the token to control access to securable
// objects and to control the ability of the user to perform various
// system-related operations on the local computer.
type Token Handle

// OpenCurrentProcessToken opens the access token
// associated with current process.
func OpenCurrentProcessToken() (Token, error) {
        p, e := GetCurrentProcess()
        if e != nil {
                return 0, e
        }
        var t Token
        e = OpenProcessToken(p, TOKEN_QUERY, &t)
        if e != nil {
                return 0, e
        }
        return t, nil
}

// Close releases access to access token.
func (t Token) Close() error {
        return CloseHandle(Handle(t))
}

// getInfo retrieves a specified type of information about an access token.
func (t Token) getInfo(class uint32, initSize int) (unsafe.Pointer, error) {
        b := make([]byte, initSize)
        var n uint32
        e := GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
        if e != nil {
                if e != ERROR_INSUFFICIENT_BUFFER {
                        return nil, e
                }
                // make receive buffers of requested size and try again
                b = make([]byte, n)
                e = GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
                if e != nil {
                        return nil, e
                }
        }
        return unsafe.Pointer(&b[0]), nil
}

// GetTokenUser retrieves access token t user account information.
func (t Token) GetTokenUser() (*Tokenuser, error) {
        i, e := t.getInfo(TokenUser, 50)
        if e != nil {
                return nil, e
        }
        return (*Tokenuser)(i), nil
}

// GetTokenPrimaryGroup retrieves access token t primary group information.
// A pointer to a SID structure representing a group that will become
// the primary group of any objects created by a process using this access token.
func (t Token) GetTokenPrimaryGroup() (*Tokenprimarygroup, error) {
        i, e := t.getInfo(TokenPrimaryGroup, 50)
        if e != nil {
                return nil, e
        }
        return (*Tokenprimarygroup)(i), nil
}

// GetUserProfileDirectory retrieves path to the
// root directory of the access token t user's profile.
func (t Token) GetUserProfileDirectory() (string, error) {
        b := make([]uint16, 100)
        n := uint32(len(b))
        e := GetUserProfileDirectory(t, &b[0], &n)
        if e != nil {
                if e != ERROR_INSUFFICIENT_BUFFER {
                        return "", e
                }
                // make receive buffers of requested size and try again
                b = make([]uint16, n)
                e = GetUserProfileDirectory(t, &b[0], &n)
                if e != nil {
                        return "", e
                }
        }
        return UTF16ToString(b), nil
}