bank: funny auto-account name stems in withdraw API

scripts/taler-bank/demo-withdraw-api.py

@@ -123,11 +123,42 @@ def mint_withdraw() -> dict:
     }
 
 
-def _rand_username() -> str:
-    # Shown to the user: goa-account-<random> (bank-safe [a-z0-9-])
+# Funny stems for usernames / display names (bank-safe when lowercased)
+_FUNNY_STEMS = (
+    "space-potato",
+    "cosmic-slug",
+    "nebula-nudge",
+    "orbit-onion",
+    "voidwave-vibe",
+    "comet-crumb",
+    "quark-quack",
+    "plasma-pickle",
+    "astro-bagel",
+    "lunar-llama",
+    "warp-waffle",
+    "photon-pickle",
+    "galaxy-gherkin",
+    "rocket-raisin",
+    "satellite-salsa",
+    "meteor-muffin",
+    "blackhole-burrito",
+    "stardust-pretzel",
+    "hyperdrive-hummus",
+    "tachyonic-taco",
+)
+
+
+def _rand_username_and_name() -> tuple[str, str]:
+    # Username: goa-account-<funny>-<short id> (shown to user)
+    # Display name: Title Case funny phrase + id
+    stem = secrets.choice(_FUNNY_STEMS)
     alphabet = string.ascii_lowercase + string.digits
-    rnd = "".join(secrets.choice(alphabet) for _ in range(12))
-    return "goa-account-" + rnd
+    tag = "".join(secrets.choice(alphabet) for _ in range(5))
+    username = f"goa-account-{stem}-{tag}"
+    # human name: "Space Potato · k3m9x"
+    pretty = " ".join(w.capitalize() for w in stem.split("-"))
+    name = f"{pretty} · {tag}"
+    return username, name
 
 
 def _rand_password() -> str:
@@ -140,10 +171,8 @@ def _rand_password() -> str:
 
 def create_personal_account() -> dict:
     """Public registration: auto username/password, balance starts at 0."""
-    username = _rand_username()
+    username, name = _rand_username_and_name()
     password = _rand_password()
-    # Display name mirrors username for webui clarity
-    name = username
     code, body = http_json(
         "POST",
         f"{BANK}/accounts",
@@ -156,8 +185,7 @@ def create_personal_account() -> dict:
     if code not in (200, 201, 204):
         # retry once on conflict
         if code in (409, 400):
-            username = _rand_username()
-            name = username
+            username, name = _rand_username_and_name()
             code, body = http_json(
                 "POST",
                 f"{BANK}/accounts",
@@ -180,12 +208,14 @@ def create_personal_account() -> dict:
         "username": username,
         "password": password,
         "name": name,
+        "display_name": name,
         "balance": "GOA:0",
         "balance_note": "Starts at zero — not the shared community pool.",
         "payto_uri": payto,
         "webui": "https://bank.hacktivism.ch/webui/",
         "hint": (
-            "This bank account was created for you automatically. "
+            "This bank account was created for you automatically "
+            f"(funny name: {name}). "
             "Copy username and password now — we do not store them for later recovery. "
             "Balance starts at GOA:0."
         ),