From 6617450c2146fdc77e5dc477ce361bf14b2a18ac Mon Sep 17 00:00:00 2001
From: callebtc <93376500+callebtc@users.noreply.github.com>
Date: Fri, 10 Jun 2022 16:05:33 +0200
Subject: [PATCH] store fiat_base_multiplier in db

---
 lnbits/extensions/lnurlp/crud.py       | 14 ++++++++------
 lnbits/extensions/lnurlp/migrations.py | 10 ++++++++++
 lnbits/extensions/lnurlp/models.py     |  7 ++++---
 3 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/lnbits/extensions/lnurlp/crud.py b/lnbits/extensions/lnurlp/crud.py
index 0559e063a..2eda3322c 100644
--- a/lnbits/extensions/lnurlp/crud.py
+++ b/lnbits/extensions/lnurlp/crud.py
@@ -10,10 +10,10 @@ async def create_pay_link(data: CreatePayLinkData, wallet_id: str) -> PayLink:
     returning = "" if db.type == SQLITE else "RETURNING ID"
     method = db.execute if db.type == SQLITE else db.fetchone
     # database only allows int4 entries for min and max. For fiat currencies,
-    # we multiply by 100 to save the value in cents.
-    if data.currency:
-        data.min *= 100
-        data.max *= 100
+    # we multiply by data.fiat_base_multiplier (usually 100) to save the value in cents.
+    if data.currency and data.fiat_base_multiplier:
+        data.min *= data.fiat_base_multiplier
+        data.max *= data.fiat_base_multiplier
 
     result = await (method)(
         f"""
@@ -28,9 +28,10 @@ async def create_pay_link(data: CreatePayLinkData, wallet_id: str) -> PayLink:
             success_text,
             success_url,
             comment_chars,
-            currency
+            currency,
+            fiat_base_multiplier
         )
-        VALUES (?, ?, ?, ?, 0, 0, ?, ?, ?, ?, ?)
+        VALUES (?, ?, ?, ?, 0, 0, ?, ?, ?, ?, ?, ?)
         {returning}
         """,
         (
@@ -43,6 +44,7 @@ async def create_pay_link(data: CreatePayLinkData, wallet_id: str) -> PayLink:
             data.success_url,
             data.comment_chars,
             data.currency,
+            data.fiat_base_multiplier,
         ),
     )
     if db.type == SQLITE:
diff --git a/lnbits/extensions/lnurlp/migrations.py b/lnbits/extensions/lnurlp/migrations.py
index 428bde2c8..81dd62f83 100644
--- a/lnbits/extensions/lnurlp/migrations.py
+++ b/lnbits/extensions/lnurlp/migrations.py
@@ -50,3 +50,13 @@ async def m003_min_max_comment_fiat(db):
     await db.execute("ALTER TABLE lnurlp.pay_links ADD COLUMN max INTEGER;")
     await db.execute("UPDATE lnurlp.pay_links SET max = min;")
     await db.execute("DROP TABLE lnurlp.invoices")
+
+
+async def m004_fiat_base_multiplier(db):
+    """
+    Store the multiplier for fiat prices. We store the price in cents and
+    remember to multiply by 100 when we use it to convert to Dollars.
+    """
+    await db.execute(
+        "ALTER TABLE lnurlp.pay_links ADD COLUMN fiat_base_multiplier INTEGER DEFAULT 1;"
+    )
diff --git a/lnbits/extensions/lnurlp/models.py b/lnbits/extensions/lnurlp/models.py
index 6d0b0ee0b..c4cae5eba 100644
--- a/lnbits/extensions/lnurlp/models.py
+++ b/lnbits/extensions/lnurlp/models.py
@@ -18,6 +18,7 @@ class CreatePayLinkData(BaseModel):
     webhook_url: str = Query(None)
     success_text: str = Query(None)
     success_url: str = Query(None)
+    fiat_base_multiplier: int = Query(100, ge=1)
 
 
 class PayLink(BaseModel):
@@ -37,9 +38,9 @@ class PayLink(BaseModel):
     @classmethod
     def from_row(cls, row: Row) -> "PayLink":
         data = dict(row)
-        if data["currency"]:
-            data["min"] /= 100
-            data["max"] /= 100
+        if data["currency"] and data["fiat_base_multiplier"]:
+            data["min"] /= data["fiat_base_multiplier"]
+            data["max"] /= data["fiat_base_multiplier"]
         return cls(**data)
 
     def lnurl(self, req: Request) -> str: