feat: add node startup flow

packages/node/meshnet_node/wallet.py

@@ -0,0 +1,64 @@
+"""Solana wallet management — load or generate an Ed25519 keypair.
+
+Solana keypair format: 64-byte array stored as JSON list of ints.
+  bytes 0-31: private scalar (seed)
+  bytes 32-63: public key (on-curve point)
+Wallet address: base58-encoded 32-byte public key.
+"""
+
+import json
+from pathlib import Path
+
+_DEFAULT_WALLET_PATH = Path.home() / ".config" / "meshnet" / "wallet.json"
+
+_B58_ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
+
+
+def _b58encode(data: bytes) -> str:
+    n = int.from_bytes(data, "big")
+    chars: list[str] = []
+    while n:
+        n, rem = divmod(n, 58)
+        chars.append(_B58_ALPHABET[rem])
+    leading = 0
+    for b in data:
+        if b == 0:
+            leading += 1
+        else:
+            break
+    return "1" * leading + "".join(reversed(chars))
+
+
+def load_or_create_wallet(
+    path: Path = _DEFAULT_WALLET_PATH,
+) -> tuple[bytes, bytes, str]:
+    """Return (secret_32, public_32, address_base58).
+
+    Loads from *path* if it exists; otherwise generates a new keypair and
+    saves it.  The parent directory is created if needed.
+    """
+    if path.exists():
+        mode = path.stat().st_mode & 0o777
+        if mode & 0o077:
+            path.chmod(0o600)
+        raw = bytes(json.loads(path.read_text()))
+        if len(raw) != 64:
+            raise ValueError(f"Wallet at {path} has unexpected length {len(raw)}, expected 64")
+        secret, public = raw[:32], raw[32:]
+        return secret, public, _b58encode(public)
+
+    from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
+    from cryptography.hazmat.primitives.serialization import (
+        Encoding, NoEncryption, PrivateFormat, PublicFormat,
+    )
+
+    priv = Ed25519PrivateKey.generate()
+    secret = priv.private_bytes(Encoding.Raw, PrivateFormat.Raw, NoEncryption())
+    public = priv.public_key().public_bytes(Encoding.Raw, PublicFormat.Raw)
+    keypair = list(secret) + list(public)
+
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(json.dumps(keypair))
+    path.chmod(0o600)
+
+    return secret, public, _b58encode(public)