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node-libcoin/util/EncodedData.js at master · leostera/node-libcoin · GitHub
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util
/
EncodedData.js
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node-libcoin
/
util
/
EncodedData.js
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require
(
'classtool'
)
;
function
ClassSpec
(
b
)
{
var
base58
=
b
.
base58
||
require
(
'base58-native'
)
.
base58Check
;
// Constructor. Takes the following forms:
// new EncodedData(<base58_address_string>)
// new EncodedData(<binary_buffer>)
// new EncodedData(<data>, <encoding>)
// new EncodedData(<version>, <20-byte-hash>)
function
EncodedData
(
data
,
encoding
)
{
this
.
data
=
data
;
if
(
!
encoding
&&
(
typeof
data
==
'string'
)
)
{
this
.
__proto__
=
this
.
encodings
[
'base58'
]
;
}
else
{
this
.
__proto__
=
this
.
encodings
[
encoding
||
'binary'
]
;
}
}
;
// get or set the encoding used (transforms data)
EncodedData
.
prototype
.
encoding
=
function
(
encoding
)
{
if
(
encoding
&&
(
encoding
!=
this
.
_encoding
)
)
{
this
.
data
=
this
.
as
(
encoding
)
;
this
.
__proto__
=
this
.
encodings
[
encoding
]
;
}
return
this
.
_encoding
;
}
;
// answer a new instance having the given encoding
EncodedData
.
prototype
.
withEncoding
=
function
(
encoding
)
{
return
new
EncodedData
(
this
.
as
(
encoding
)
,
encoding
)
;
}
;
// answer the data in the given encoding
EncodedData
.
prototype
.
as
=
function
(
encoding
)
{
if
(
!
encodings
[
encoding
]
)
throw
new
Error
(
'invalid encoding'
)
;
return
this
.
converters
[
encoding
]
.
call
(
this
)
;
}
;
// validate that we can convert to binary
EncodedData
.
prototype
.
_validate
=
function
(
)
{
this
.
withEncoding
(
'binary'
)
;
}
;
// Boolean protocol for testing if valid
EncodedData
.
prototype
.
isValid
=
function
(
)
{
try
{
this
.
validate
(
)
;
return
true
;
}
catch
(
e
)
{
return
false
;
}
}
;
// subclasses can override to do more stuff
EncodedData
.
prototype
.
validate
=
function
(
)
{
this
.
_validate
(
)
;
}
;
// Boolean protocol for testing if valid
EncodedData
.
prototype
.
isValid
=
function
(
)
{
try
{
this
.
validate
(
)
;
return
true
;
}
catch
(
e
)
{
return
false
;
}
}
;
// convert to a string (in base58 form)
EncodedData
.
prototype
.
toString
=
function
(
)
{
return
this
.
as
(
'base58'
)
;
}
;
// utility
EncodedData
.
prototype
.
doAsBinary
=
function
(
callback
)
{
var
oldEncoding
=
this
.
encoding
(
)
;
this
.
encoding
(
'binary'
)
;
callback
.
apply
(
this
)
;
this
.
encoding
(
oldEncoding
)
;
}
;
// Setup support for various address encodings. The object for
// each encoding inherits from the EncodedData prototype. This
// allows any encoding to override any method...changing the encoding
// for an instance will change the encoding it inherits from. Note,
// this will present some problems for anyone wanting to inherit from
// EncodedData (we'll deal with that when needed).
var
encodings
=
{
'binary'
:
{
converters
:
{
'binary'
:
function
(
)
{
var
answer
=
new
Buffer
(
this
.
data
.
length
)
;
this
.
data
.
copy
(
answer
)
;
return
answer
;
}
,
'base58'
:
function
(
)
{
return
base58
.
encode
(
this
.
data
)
;
}
,
'hex'
:
function
(
)
{
return
this
.
data
.
toString
(
'hex'
)
;
}
,
}
,
_validate
:
function
(
)
{
//nothing to do here...we make no assumptions about the data
}
,
}
,
'base58'
:
{
converters
:
{
'binary'
:
function
(
)
{
return
base58
.
decode
(
this
.
data
)
;
}
,
'hex'
:
function
(
)
{
return
this
.
withEncoding
(
'binary'
)
.
as
(
'hex'
)
;
}
,
}
,
}
,
'hex'
:
{
converters
:
{
'binary'
:
function
(
)
{
return
new
Buffer
(
this
.
data
,
'hex'
)
;
}
,
'base58'
:
function
(
)
{
return
this
.
withEncoding
(
'binary'
)
.
as
(
'base58'
)
;
}
,
}
,
}
,
}
;
for
(
var
k
in
encodings
)
{
if
(
!
encodings
[
k
]
.
converters
[
k
]
)
encodings
[
k
]
.
converters
[
k
]
=
function
(
)
{
return
this
.
data
;
}
;
encodings
[
k
]
.
_encoding
=
k
;
}
EncodedData
.
applyEncodingsTo
=
function
(
aClass
)
{
var
tmp
=
{
}
;
for
(
var
k
in
encodings
)
{
var
enc
=
encodings
[
k
]
;
var
obj
=
{
}
;
for
(
var
j
in
enc
)
{
obj
[
j
]
=
enc
[
j
]
;
}
obj
.
__proto__
=
aClass
.
prototype
;
tmp
[
k
]
=
obj
;
}
aClass
.
prototype
.
encodings
=
tmp
;
}
;
EncodedData
.
applyEncodingsTo
(
EncodedData
)
;
return
EncodedData
;
}
;
module
.
defineClass
(
ClassSpec
)
;
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