EIOPA: add LeiUtil with LEI validator (lexical and checksum)

arelle/LeiUtil.py

@@ -0,0 +1,56 @@
+'''
+Created on Apr 25, 2015
+
+@author: Mark V Systems Limited
+(c) Copyright 2015 Mark V Systems Limited, All rights reserved.
+
+Implementation of ISO 17442:2012(E) Appendix A
+
+'''
+try:
+    import regex as re
+except ImportError:
+    import re
+
+LEI_VALID = 0
+LEI_INVALID_LEXICAL = 1
+LEI_INVALID_CHECKSUM = 2
+
+LEI_RESULTS = ("valid", "invalid lexical", "invalid checksum")
+
+leiLexicalPattern = re.compile(r"^\s*[0-9A-Z]{18}[0-9]{2}\s*$")
+
+def checkLei(lei):
+    if not leiLexicalPattern.match(lei):
+        return LEI_INVALID_LEXICAL
+    if not int(
+        "".join({"0":"0", "1":"1", "2":"2", "3":"3", "4":"4", "5":"5", "6":"6", "7":"7", "8":"8", "9":"9",
+                 "A":"10", "B":"11", "C":"12", "D":"13", "E":"14", "F":"15", "G":"16", "H":"17", "I":"18",
+                 "J":"19", "K":"20", "L":"21", "M":"22", "N":"23", "O":"24", "P":"25", "Q":"26", "R":"27",
+                 "S":"28", "T":"29", "U":"30", "V":"31", "W":"32", "X":"33", "Y":"34", "Z":"35"
+                 }[c] for c in lei)
+               ) % 97 == 1:
+        return LEI_INVALID_CHECKSUM  
+    return LEI_VALID
+
+if __name__ == "__main__":
+    # test cases
+    for lei, name in ( 
+                        ("001GPB6A9XPE8XJICC14", "Fidelity Advisor Series I"),
+                        ("004L5FPTUREIWK9T2N63", "Hutchin Hill Capital, LP"),
+                        ("00EHHQ2ZHDCFXJCPCL46", "Vanguard Russell 1000 Growth Index Trust"),
+                        ("00GBW0Z2GYIER7DHDS71", "Aristeia Capital, L.L.C."),
+                        ("1S619D6B3ZQIH6MS6B47", "Barclays Vie SA"),
+                        ("21380014JAZAUFJRHC43", "BRE/OPERA HOLDINGS"),
+                        ("21380016W7GAG26FIJ74", "SOCIETE FRANCAISE ET SUISSE"),
+                        ("21380058ERUIT9H53T71", "TOTAN ICAP CO., LTD"),
+                        ("213800A9GT65GAES2V60", "BARCLAYS SECURITIES JAPAN LIMITED"),
+                        ("213800DELL1MWFDHVN53", "PIRELLI JAPAN"),
+                        ("213800A9GT65GAES2V60", "BARCLAYS SECURITIES JAPAN LIMITED"),
+                        ("214800A9GT65GAES2V60", "Error 1"),
+                        ("213800A9GT65GAE%2V60", "Error 2"),
+                        ("213800A9GT65GAES2V62", "Error 3"),
+                        ("1234", "Error 4"),
+                        ):
+            print ("LEI {} result {} name {}".format(lei, LEI_RESULTS[checkLei(lei)], name)  )
+