added support for new testnets in blockfrost

Author: mateusap1

pycardano/backend/blockfrost.py

@@ -12,7 +12,7 @@
 from pycardano.exception import TransactionFailedException
 from pycardano.hash import SCRIPT_HASH_SIZE, DatumHash, ScriptHash
 from pycardano.nativescript import NativeScript
-from pycardano.network import Network
+from pycardano.network import Network, BLOCKFROST_URLS
 from pycardano.plutus import ExecutionUnits, PlutusV1Script, PlutusV2Script
 from pycardano.serialization import RawCBOR
 from pycardano.transaction import (
@@ -46,11 +46,7 @@ class BlockFrostChainContext(ChainContext):
     def __init__(self, project_id: str, network: Network = Network.TESTNET):
         self._network = network
         self._project_id = project_id
-        self._base_url = (
-            ApiUrls.testnet.value
-            if self.network == Network.TESTNET
-            else ApiUrls.mainnet.value
-        )
+        self._base_url = BLOCKFROST_URLS[network]
         self.api = BlockFrostApi(project_id=self._project_id, base_url=self._base_url)
         self._epoch_info = self.api.epoch_latest()
         self._epoch = None

pycardano/network.py

@@ -16,10 +16,20 @@ class Network(CBORSerializable, Enum):
 
     TESTNET = 0
     MAINNET = 1
+    PREVIEW = 2
+    PREPROD = 3
 
     def to_primitive(self) -> int:
         return self.value
 
     @classmethod
     def from_primitive(cls, value: int) -> Network:
         return cls(value)
+
+
+BLOCKFROST_URLS = {
+    Network.MAINNET: "https://cardano-mainnet.blockfrost.io/api",
+    Network.TESTNET: "https://cardano-testnet.blockfrost.io/api",
+    Network.PREVIEW: "https://cardano-preview.blockfrost.io/api",
+    Network.PREPROD: "https://cardano-preprod.blockfrost.io/api",
+}