no-fix: move out useBackend hook

1 files changed, 49 insertions, 0 deletions

diff --git a/packages/demobank-ui/src/utils.ts b/packages/demobank-ui/src/utils.ts
new file mode 100644
index 000000000..d812f2ec9
--- /dev/null
+++ b/packages/demobank-ui/src/utils.ts
@@ -0,0 +1,49 @@
+
+/**
+ * Validate (the number part of) an amount.  If needed,
+ * replace comma with a dot.  Returns 'false' whenever
+ * the input is invalid, the valid amount otherwise.
+ */
+export function validateAmount(maybeAmount: string): any {
+  const amountRegex = "^[0-9]+(.[0-9]+)?$";
+  if (!maybeAmount) {
+    console.log(`Entered amount (${maybeAmount}) mismatched <input> pattern.`);
+    return;
+  }
+  if (typeof maybeAmount !== "undefined" || maybeAmount !== "") {
+    console.log(`Maybe valid amount: ${maybeAmount}`);
+    // tolerating comma instead of point.
+    const re = RegExp(amountRegex);
+    if (!re.test(maybeAmount)) {
+      console.log(`Not using invalid amount '${maybeAmount}'.`);
+      return false;
+    }
+  }
+  return maybeAmount;
+}
+
+/**
+ * Extract IBAN from a Payto URI.
+ */
+export function getIbanFromPayto(url: string): string {
+  const pathSplit = new URL(url).pathname.split("/");
+  let lastIndex = pathSplit.length - 1;
+  // Happens if the path ends with "/".
+  if (pathSplit[lastIndex] === "") lastIndex--;
+  const iban = pathSplit[lastIndex];
+  return iban;
+}
+
+export function getBankBackendBaseUrl(): string {
+  const overrideUrl = localStorage.getItem("bank-base-url");
+  if (overrideUrl) {
+    console.log(
+      `using bank base URL ${overrideUrl} (override via bank-base-url localStorage)`,
+    );
+    return overrideUrl;
+  }
+  const maybeRootPath = "https://bank.demo.taler.net/demobanks/default/";
+  if (!maybeRootPath.endsWith("/")) return `${maybeRootPath}/`;
+  console.log(`using bank base URL (${maybeRootPath})`);
+  return maybeRootPath;
+}