move cashu functions to cashu_utils, add test functions

utils/zap_utils.py

@@ -8,8 +8,6 @@ from Crypto.Cipher import AES
 from Crypto.Util.Padding import pad
 from bech32 import bech32_decode, convertbits, bech32_encode
 from nostr_sdk import nostr_sdk, PublicKey, SecretKey, Event, EventBuilder, Tag, Keys
-
-from utils.database_utils import get_or_add_user
 from utils.dvmconfig import DVMConfig
 from utils.nostr_utils import get_event_by_id, check_and_decrypt_own_tags
 import lnurl
@@ -249,96 +247,6 @@ def zap(lud16: str, amount: int, content, zapped_event: Event, keys, dvm_config,
         return None
 
 
-def parse_cashu(cashu_token: str):
-    try:
-        prefix = "cashuA"
-        assert cashu_token.startswith(prefix), Exception(
-            f"Token prefix not valid. Expected {prefix}."
-        )
-        if not cashu_token.endswith("="):
-            cashu_token = str(cashu_token) + "=="
-        print(cashu_token)
-        token_base64 = cashu_token[len(prefix):].encode("utf-8")
-        cashu = json.loads(base64.urlsafe_b64decode(token_base64))
-        token = cashu["token"][0]
-        proofs = token["proofs"]
-        mint = token["mint"]
-        total_amount = 0
-        for proof in proofs:
-            total_amount += proof["amount"]
-
-
-        return proofs, mint, total_amount, None
-
-    except Exception as e:
-        print(e)
-        return None, None, None, "Cashu Parser: " + str(e)
-
-
-def redeem_cashu(cashu, config, client, required_amount=0, update_self=False) -> (bool, str, int, int):
-    proofs, mint, total_amount, message = parse_cashu(cashu)
-    if message is not None:
-        return False, message, 0, 0
-
-    # Not sure if this the best way to go, we first create an invoice that we send to the mint, we catch the fees
-    # for that invoice, and create another invoice with the amount without fees to melt.
-    if config.LNBITS_INVOICE_KEY != "":
-        invoice, paymenthash = create_bolt11_ln_bits(total_amount, config)
-    else:
-
-        user = get_or_add_user(db=config.DB, npub=config.PUBLIC_KEY,
-                               client=client, config=config, update=update_self)
-        invoice = create_bolt11_lud16(user.lud16, total_amount)
-    print(invoice)
-    if invoice is None:
-        return False, "couldn't create invoice", 0, 0
-
-    url = mint + "/checkfees"  # Melt cashu tokens at Mint
-    json_object = {"pr": invoice}
-    headers = {"Content-Type": "application/json; charset=utf-8"}
-    request_body = json.dumps(json_object).encode('utf-8')
-    request = requests.post(url, data=request_body, headers=headers)
-    tree = json.loads(request.text)
-    fees = tree["fee"]
-    print("Fees on this mint are " + str(fees) + " Sats")
-    redeem_invoice_amount = total_amount -fees
-    if redeem_invoice_amount < required_amount:
-        err = ("Token value (Payment: " + str(total_amount) + " Sats. Fees: " +
-               str(fees) + " Sats) below required amount of  " + str(required_amount)
-               + " Sats. Cashu token has not been claimed.")
-        print("[" + config.NIP89.NAME + "] " + err)
-        return False, err, 0, 0
-
-    if config.LNBITS_INVOICE_KEY != "":
-        invoice, paymenthash = create_bolt11_ln_bits(redeem_invoice_amount, config)
-    else:
-
-        user = get_or_add_user(db=config.DB, npub=config.PUBLIC_KEY,
-                               client=client, config=config, update=update_self)
-        invoice = create_bolt11_lud16(user.lud16, redeem_invoice_amount)
-    print(invoice)
-
-    try:
-        url = mint + "/melt"  # Melt cashu tokens at Mint
-        json_object = {"proofs": proofs, "pr": invoice}
-        headers = {"Content-Type": "application/json; charset=utf-8"}
-        request_body = json.dumps(json_object).encode('utf-8')
-        request = requests.post(url, data=request_body, headers=headers)
-        tree = json.loads(request.text)
-        print(request.text)
-        is_paid = tree["paid"] if tree.get("paid") else False
-        print(is_paid)
-        if is_paid:
-            print("cashu token redeemed")
-            return True, "success", redeem_invoice_amount, fees
-        else:
-            msg = tree.get("detail").split('.')[0].strip() if tree.get("detail") else None
-            print(msg)
-            return False, msg
-    except Exception as e:
-        print(e)
-
-    return False, "", redeem_invoice_amount, fees