asText fails when we try to print the filter

[grk-it]

• asText function errors out when we try to print the human friendly text for the filters. This commit tries to fix the same.
• Updated tests related to the above change.

Context:

Steps to reproduce:

1. Implemented the simple ldapserver as mentioned in the following blog: http://tonthon.blogspot.com/2011/02/ldaptor-ldap-with-twisted-server-side.html

Here's the contents of the folder ldaptor-example:

(venv) ➜  ldaptor-example ls
schema.py   server.py   venv

Python version:

(venv) ➜  ldaptor-example python --version
Python 3.8.0

To start the server:

(venv) ➜  ldaptor-example python server.py
2021-05-10 15:24:24-0500 [-] Log opened.
2021-05-10 15:24:24-0500 [-] LDAPServerFactory starting on 8080
2021-05-10 15:24:24-0500 [-] Starting factory <__main__.LDAPServerFactory object at 0x10fa13a60>

2. Added the following lines in the file venv/lib/python3.8/site-packages/ldaptor/protocols/ldap/ldapserver.py:

265             reply(
266                 pureldap.LDAPSearchResultEntry(
267                     objectName=entry.dn.getText(),
268                     attributes=filtered_attribs,
269                 )
270             )
271         print(type(request.filter)) # <<<
272         print(request.filter.toWire())  # <<<
273         print(request.filter.asText()) # <<<
274         d = base.search(
275             filterObject=request.filter,
276             attributes=request.attributes,
277             scope=request.scope,
278             derefAliases=request.derefAliases,
279             sizeLimit=request.sizeLimit,
280             timeLimit=request.timeLimit,
281             typesOnly=request.typesOnly,
282             callback=_sendEntryToClient,
283         )

3. Issued the following search:

➜  ~ ldapsearch -x -h 127.0.0.1 -p 8080  'uid=esteban'
# extended LDIF
#
# LDAPv3
# base <> (default) with scope subtree
# filter: uid=esteban
# requesting: ALL
#

# search result
search: 2
result: 80 Other (e.g., implementation specific) error
text: can only concatenate str (not "bytes") to str

# numResponses: 1

Here's the backtrace on the server side:

(venv) ➜  ldaptor-example python server.py
2021-05-10 15:31:40-0500 [-] Log opened.
2021-05-10 15:31:40-0500 [-] LDAPServerFactory starting on 8080
2021-05-10 15:31:40-0500 [-] Starting factory <__main__.LDAPServerFactory object at 0x10b906f70>
2021-05-10 15:31:42-0500 [-] <class 'ldaptor.protocols.pureldap.LDAPFilter_equalityMatch'>
2021-05-10 15:31:42-0500 [-] b'\xa3\x0e\x04\x03uid\x04\x07esteban'
2021-05-10 15:31:42-0500 [-] Unhandled Error
	Traceback (most recent call last):
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/twisted/internet/defer.py", line 167, in maybeDeferred
	    result = f(*args, **kw)
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/ldaptor/protocols/ldap/ldapserver.py", line 316, in handle_LDAPSearchRequest
	    d.addCallback(self._cbSearchGotBase, dn, request, reply)
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/twisted/internet/defer.py", line 339, in addCallback
	    return self.addCallbacks(callback, callbackArgs=args, callbackKeywords=kw)
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/twisted/internet/defer.py", line 330, in addCallbacks
	    self._runCallbacks()
	--- <exception caught here> ---
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/twisted/internet/defer.py", line 662, in _runCallbacks
	    current.result = callback(current.result, *args, **kw)
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/ldaptor/protocols/ldap/ldapserver.py", line 294, in _cbSearchLDAPError
	    reason.trap(ldaperrors.LDAPException)
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/twisted/python/failure.py", line 450, in trap
	    self.raiseException()
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/twisted/python/failure.py", line 475, in raiseException
	    raise self.value.with_traceback(self.tb)
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/twisted/internet/defer.py", line 662, in _runCallbacks
	    current.result = callback(current.result, *args, **kw)
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/ldaptor/protocols/ldap/ldapserver.py", line 273, in _cbSearchGotBase
	    print(request.filter.asText())
	  File "/Users/grk/ldaptor-example/venv/lib/python3.8/site-packages/ldaptor/protocols/pureldap.py", line 573, in asText
	    "("
	builtins.TypeError: can only concatenate str (not "bytes") to str

Here's the test report after running the tests in the local (after the fix):

===============================================================================
[SUCCESS!?!]
Reason: 'Not supported yet.'

ldaptor.test.test_server.TestSchema.testSimple
-------------------------------------------------------------------------------
Ran 672 tests in 1.526s

PASSED (unexpectedSuccesses=1, successes=671)
py38-test-dev run-test: commands[3] | coverage report --show-missing
No data to report.

[codecov[bot]]

Codecov Report

Merging #226 (29e26d6) into master (4e06f4e) will decrease coverage by 0.78%. The diff coverage is 100.00%.

:exclamation: Current head 29e26d6 differs from pull request most recent head 13d1b7b. Consider uploading reports for the commit 13d1b7b to get more accurate results

@@            Coverage Diff             @@
##           master     #226      +/-   ##
==========================================
- Coverage   83.28%   82.50%   -0.79%     
==========================================
  Files          87       87              
  Lines       11567    11794     +227     
  Branches     1184     1232      +48     
==========================================
+ Hits         9634     9731      +97     
- Misses       1815     1943     +128     
- Partials      118      120       +2     

Impacted Files	Coverage Δ
ldaptor/protocols/pureldap.py	83.61% <100.00%> (-10.96%)	:arrow_down:
ldaptor/test/test_ldapfilter.py	100.00% <100.00%> (ø)
ldaptor/test/test_pureldap.py	100.00% <100.00%> (ø)
ldaptor/test/test_autofill_samba.py	100.00% <0.00%> (ø)
ldaptor/protocols/ldap/distinguishedname.py	89.09% <0.00%> (ø)

---

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[grk-it]

@psi29a @graingert Could any of you please help me with the approval for running the flow and the review subsequently.

[graingert]

hmm I only have permission to force merge this PR as administrator. I don't have permission to enable CI

[adiroiban]

I have approved the run now. @graingert I think that you should now be owner of everything and in the future you should be able to approve the CI run for new contributors.