first commit

backend/app/template_validators.py

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+import re
+
+TEMPLATE_NAME_PATTERN = re.compile(r"^[A-Z0-9_]{3,40}$")
+DLT_TEMPLATE_ID_PATTERN = re.compile(r"^\d{12,25}$")
+VARIABLE_TOKEN = "{#var#}"
+
+
+def normalize_template_name(value: str) -> str:
+    return value.strip().upper().replace(" ", "_")
+
+
+def validate_template_name(value: str) -> str:
+    name = normalize_template_name(value)
+    if not TEMPLATE_NAME_PATTERN.match(name):
+        raise ValueError("Template name must be 3–40 uppercase letters, numbers, or underscores")
+    return name
+
+
+def validate_template_text(value: str) -> str:
+    text = value.strip()
+    if len(text) < 10:
+        raise ValueError("Template must be at least 10 characters")
+    if len(text) > 1000:
+        raise ValueError("Template must be 1000 characters or fewer")
+    return text
+
+
+def validate_dlt_template_id(value: str) -> str:
+    template_id = value.strip()
+    if not DLT_TEMPLATE_ID_PATTERN.match(template_id):
+        raise ValueError("DLT Template ID must be 12–25 digits")
+    return template_id