insight api: use hex code

The insight api transaction parser used to look at the assembly to
reconstruct the input and output scripts.  This patch changes it to
use the hex input directly.  This fixes parsing some instructions with
unknown opcodes (e.g. multisig inputs with "0" opcode).

trezorlib/tx_api.py

@@ -5,44 +5,6 @@ from decimal import Decimal
 from filecache import filecache, DAY
 import types_pb2 as proto_types
 
-def op_push_data(data):
-    l = len(data)
-    if l < 0x4C:
-        return chr(l) + data
-    elif i < 0xFF:
-        return '\x4C' + chr(l) + data
-    elif i < 0xFFFF:
-        return '\x4D' + struct.pack("<H", i) + data
-    else:
-        return '\x4E' + struct.pack("<I", i) + data
-
-def opcode_serialize(opcode):
-    mapping = {
-        'OP_TRUE'                : '\x51',
-        'OP_RETURN'              : '\x6A',
-        'OP_DUP'                 : '\x76',
-        'OP_EQUAL'               : '\x87',
-        'OP_EQUALVERIFY'         : '\x88',
-        'OP_RIPEMD160'           : '\xA6',
-        'OP_SHA1'                : '\xA7',
-        'OP_SHA256'              : '\xA8',
-        'OP_HASH160'             : '\xA9',
-        'OP_HASH256'             : '\xAA',
-        'OP_CHECKSIG'            : '\xAC',
-        'OP_CHECKSIGVERIFY'      : '\xAD',
-        'OP_CHECKMULTISIG'       : '\xAE',
-        'OP_CHECKMULTISIGVERIFY' : '\xAF',
-    }
-    # check if it is known opcode
-    if mapping.has_key(opcode):
-        return mapping[opcode]
-    # it's probably hex data
-    try:
-        x = binascii.unhexlify(opcode)
-        return op_push_data(x)
-    except:
-        raise Exception('Unknown script opcode: %s' % opcode)
-
 def insight_tx(url, rawdata=False):
     if not rawdata:
         try:
@@ -68,17 +30,13 @@ def insight_tx(url, rawdata=False):
         else:
             i.prev_hash = binascii.unhexlify(vin['txid'])
             i.prev_index = vin['vout']
-            asm = vin['scriptSig']['asm'].split(' ')
-            asm = [ opcode_serialize(x) for x in asm ]
-            i.script_sig = ''.join(asm)
+            i.script_sig = binascii.unhexlify(vin['scriptSig']['hex'])
             i.sequence = vin['sequence']
 
     for vout in data['vout']:
         o = t.bin_outputs.add()
         o.amount = int(Decimal(str(vout['value'])) * 100000000)
-        asm = vout['scriptPubKey']['asm'].split(' ')
-        asm = [ opcode_serialize(x) for x in asm ]
-        o.script_pubkey = ''.join(asm)
+        o.script_pubkey = binascii.unhexlify(vout['scriptPubKey']['hex'])
 
     return t