Determinstic secrets / ecash restore (#131)

* first working version but some sats go missing

* back at it

* make format

* restore to main

* move mint database

* fix some tests

* make format

* remove old _construct_outputs we reintroduced in merge with main

* add type annotations

* add wallet private key to tests

* wallet: load proofs

* fix tests

* _generate_secrets with deterministic generation (temporary)

* allow wallet initialization with custom private key

* add pk to wallet api test

* mint scope=module

* remove private_key from test_wallet.py to see if it helps with the github tests

* readd private keys to tests

* workflow without env

* add more private key!

* readd env

* ledger scope session

* add default private key for testing

* generate private keys if not available

* testing

* its working!!!

* first iteration of bip32 working

* get mint info and add many type annotations

* tests

* fix tests with bip32

* restore from multiple mints

* disable profiler

* make format

* failed POST /mint do not increment secret counter

* store derivation path in each token

* fix tests

* refactor migrations so private keys can be generated by the wallet with .with_db() classmethod

* start fixing tests

* all tests passing except those that need to set a specific private key

* bip39 mnemonic to seed - with db but restore doesnt work yet with custom seed

* mnemonic restore works

* enter mnemonic in cli

* fix tests to use different mnemonic

* properly ask user for seed input

* tests: dont ask for inputs

* try to fix tests

* fix cashu -d

* fixing

* bump version and add more text to mnemonic enter

* add more comments

* add many more comments and type annotations in the wallet

* dont print generated mnemonic and dont wait for input

* fix test

* does this fix tests?

* sigh....

* make format

* do not restore from an initialized wallet

* fix mnemonics

* fix nitpicks

* print wallet name if nonstandard wallet

* fix merge error and remove comments

* poetry lock and requirements

* remove unused code

* fix tests

* mnemonic.lower() and add keyset id if not present for backwards compat

* edit comment

cashu/mint/router.py

@@ -19,6 +19,7 @@ from ..core.base import (
     PostMeltRequest,
     PostMintRequest,
     PostMintResponse,
+    PostRestoreResponse,
     PostSplitRequest,
     PostSplitResponse,
 )
@@ -109,7 +110,7 @@ async def request_mint(amount: int = 0) -> Union[GetMintResponse, CashuError]:
     """
     logger.trace(f"> GET /mint: amount={amount}")
     if amount > 21_000_000 * 100_000_000 or amount <= 0:
-        return CashuError(code=0, error="Amount must be a valid amount of sats.")
+        return CashuError(code=0, error="Amount must be a valid amount of sat.")
     if settings.mint_peg_out_only:
         return CashuError(code=0, error="Mint does not allow minting new tokens.")
     try:
@@ -229,3 +230,15 @@ async def split(
     resp = PostSplitResponse(fst=frst_promises, snd=scnd_promises)
     logger.trace(f"< POST /split: {resp}")
     return resp
+
+
+@router.post(
+    "/restore", name="Restore", summary="Restores a blinded signature from a secret"
+)
+async def restore(payload: PostMintRequest) -> Union[CashuError, PostRestoreResponse]:
+    assert payload.outputs, Exception("no outputs provided.")
+    try:
+        outputs, promises = await ledger.restore(payload.outputs)
+    except Exception as exc:
+        return CashuError(code=0, error=str(exc))
+    return PostRestoreResponse(outputs=outputs, promises=promises)