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There are some important behaviors that handle security These are covered in detail in 8, Security, but it s worth understanding their role as behaviors behavior is a service behavior used to specify The the credentials of a service This class is useful for accessing client security information, such as the user s Windows authentication settings, and client certi cates It s implemented as a behavior so that it can inspect incoming messages for their security information attribute of an operation behavior enables imperThe sonation from the client to the service When impersonation is allowed (or required), client credentials that are passed in the channel are used by the WCF runtime to impersonate the client for the duration of the service operation behavior, scoped at either the service or The operation level, is used to authorize the caller to access the service or operthat is ation Using this behavior, you can set an responsible for inspecting claims that the user presents and determining whether to grant access to the service behavior is accessible in the The section of a con guration le and determines what, if any, information is automatically logged with each service request If not de ned, no audit information is logged

return True except (EnvironmentError, ValueError, KeyError, IncidentError) as err: print("{0}: import error: {1}"format( ospathbasename(sysargv[0]), err)) return False finally: if fh is not None: fhclose()

After reading all the lines, we return True to the caller unless an exception occurred, in which case the except block catches the exception, prints an error

message for the user, and returns False And no matter what, if the le was opened, it is closed at the end

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Behaviors are a fundamental extensibility point in the WCF architecture They are used when the client or service runtime is being constructed and with each service call When the runtime starts, it looks for behaviors or by inspecting the type structures passed into the , and then looks in con guration les Behaviors can also be object before opende ned in code and added to the , or in code by using attributes, or in con guration les ing the Behaviors implement inspectors code that inspects objects presented to them There are message inspectors that work at the message level and

[ Team LiB ]

Readers unfamiliar with regular expressions ( regexes ) are recommended to read 13 before reading this section or to skip ahead to the following section ( 312), and return here later if desired Using regular expressions to parse text les can often produce shorter code than doing everything by hand as we did in the previous subsection, but it can be more dif cult to provide good error reporting We will look at the import_text_regex() method in two parts, rst looking at the regular expressions and then at the parsing but omitting the except and finally blocks since they have nothing new to teach us

def import_text_regex(self, filename): incident_re = recompile( r"\[( P<id>[^]]+)\]( P<keyvalues>+ )" r"^\NARRATIVE_START\$( P<narrative>* )" r"^\NARRATIVE_END\$", reDOTALL|reMULTILINE) key_value_re = recompile(r"^\s*( P<key>[^=]+ )\s*=\s*" r"( P<value>+ )\s*$", reMULTILINE)

The regular expressions are written as raw strings This saves us from having to double each backslash (writing each \ as \\) for example, without using raw strings the second regular expression would have to be written as "^\\s*( P<key>[^=]+ )\\s*=\\s*( P<value>+ )\\s*$" In this book we always use raw strings for regular expressions The rst regular expression, incident_re, is used to capture an entire incident record One effect of this is that any spurious text between records will not be noticed This regular expression really has two parts The rst is \[( P<id>[^]]+)\]( P<keyvalues>+ ) which matches a [, then matches and captures into the id match group as many non-] characters as it can, then matches a ] (so this gives us the report ID), and then matches as few but at least one of any characters (including newlines because of the reDOTALL ag), into the keyvalues match group The characters matched for the keyvalues match group are the minimum necessary to take us to the second part of the regular expression The second part of the rst regular expression is ^\NARRATIVE_START\$ ( P<narrative>* )^\NARRATIVE_END\$ and this matches the literal text NARRATIVE_START, then as few characters as possible which are captured into the narrative match group, and then the literal text NARRATIVE_END, at the end of

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