The code snippets on this page need the following imports if you're outside the pyqgis console:
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User reference of the Authentication infrastructure can be readin the User Manual in the Authentication System Overview paragraph.
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This chapter describes the best practices to use the Authentication system froma developer perspective.
The authentication system is widely used in QGIS Desktop by data providers whenevercredentials are required to access a particular resource, for example when a layerestablishes a connection to a Postgres database.
There are also a few widgets in the QGIS gui library that plugin developers can use toeasily integrate the authentication infrastructure into their code:
A good code reference can be read from the authentication infrastructuretests code.
Warning
Due to the security constraints that were taken into account during the authenticationinfrastructure design, only a selected subset of the internal methods are exposed to Python.
Here are some definition of the most common objects treated in this chapter.
Password to allow access and decrypt credential stored in the QGISAuthentication DB
A Master Password crypted sqlite db qgis-auth.dbwhere Authentication Configuration are stored. e.g user/password,personal certificates and keys, Certificate Authorities
A set of authentication data depending on Authentication Method.e.g Basic authentication method stores the couple of user/password.
A specific method used to get authenticated. Each method has its ownprotocol used to gain the authenticated level. Each method is implementedas shared library loaded dynamically during QGIS authenticationinfrastructure init.
The QgsAuthManager singletonis the entry point to use the credentials stored in the QGIS encryptedAuthentication DB, i.e. the qgis-auth.db file under theactive user profile folder.
This class takes care of the user interaction: by asking to set a masterpassword or by transparently using it to access encrypted stored information.
The following snippet gives an example to set master password to open theaccess to the authentication settings. Code comments are important tounderstand the snippet.
Any stored credential is a Authentication Configuration instance of theQgsAuthMethodConfigclass accessed using a unique string like the following one:
that string is generated automatically when creating an entry using the QGIS API orGUI, but it might be useful to manually set it to a known value in case theconfiguration must be shared (with different credentials) between multiple users withinan organization.
QgsAuthMethodConfig is the base classfor any Authentication Method.Any Authentication Method sets a configuration hash map where authenticationinformations will be stored. Hereafter an useful snippet to store PKI-pathcredentials for an hypothetic alice user:
Authentication Method libraries are loaded dynamically duringauthentication manager init. Available authentication methods are:
BasicUser and password authenticationEsri-TokenESRI token based authenticationIdentity-CertIdentity certificate authenticationOAuth2OAuth2 authenticationPKI-PathsPKI paths authenticationPKI-PKCS#12PKI PKCS#12 authentication
A convenience class to pack PKI bundles composed on SslCert, SslKey and CAchain is the QgsPkiBundleclass. Hereafter a snippet to get password protected:
Refer to QgsPkiBundle class documentationto extract cert/key/CAs from the bundle.
We can remove an entry from Authentication Database using it'sauthcfg identifier with the following snippet:
The best way to use an Authentication Config stored in theAuthentication DB is referring it with the unique identifierauthcfg. Expanding, means convert it from an identifier to a completeset of credentials.The best practice to use stored Authentication Configs, is to leave itmanaged automatically by the Authentication manager.The common use of a stored configuration is to connect to an authenticationenabled service like a WMS or WFS or to a DB connection.
Note
Take into account that not all QGIS data providers are integrated with theAuthentication infrastructure. Aiseesoft video downloader 3 1 32 download free. Each authentication method, derived from thebase class QgsAuthMethodand support a different set of Providers. For example the certIdentity() method supports the following listof providers:
Sample output:
For example, to access a WMS service using stored credentials identified withauthcfg='fm1s770', we just have to use the authcfg in the data sourceURL like in the following snippet:
In the upper case, the wms provider will take care to expand authcfgURI parameter with credential just before setting the HTTP connection.
Warning
The developer would have to leave authcfg expansion to the QgsAuthManager, in this way he will be sure that expansion is not done too early.
Usually an URI string, built using the QgsDataSourceURIclass, is used to set a data source in the following way:
Note
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The False parameter is important to avoid URI complete expansion of theauthcfg id present in the URI.
Other example can be read directly in the QGIS tests upstream as intest_authmanager_pki_ows ortest_authmanager_pki_postgres.
Many third party plugins are using httplib2 or other Python networking libraries to manage HTTPconnections instead of integrating with QgsNetworkAccessManagerand its related Authentication Infrastructure integration.
To facilitate this integration a helper Python function has been createdcalled NetworkAccessManager. Its code can be found here.
This helper class can be used as in the following snippet:
In this paragraph are listed the available GUIs useful to integrateauthentication infrastructure in custom interfaces.
If it's necessary to select a Authentication Configuration from the setstored in the Authentication DB it is available in the GUI classQgsAuthConfigSelect.
and can be used as in the following snippet:
The above example is taken from the QGIS source code.The second parameter of the GUI constructor refers to data provider type. Theparameter is used to restrict the compatible Authentication Methods withthe specified provider.
The complete GUI used to manage credentials, authorities and to access toAuthentication utilities is managed by theQgsAuthEditorWidgets class.
and can be used as in the following snippet:
An integrated example can be found in the related test.
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A GUI used to manage only authorities is managed by theQgsAuthAuthoritiesEditor class.
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QgsAuthMethodConfig is the base classfor any Authentication Method.Any Authentication Method sets a configuration hash map where authenticationinformations will be stored. Hereafter an useful snippet to store PKI-pathcredentials for an hypothetic alice user:
Authentication Method libraries are loaded dynamically duringauthentication manager init. Available authentication methods are:
BasicUser and password authenticationEsri-TokenESRI token based authenticationIdentity-CertIdentity certificate authenticationOAuth2OAuth2 authenticationPKI-PathsPKI paths authenticationPKI-PKCS#12PKI PKCS#12 authentication
A convenience class to pack PKI bundles composed on SslCert, SslKey and CAchain is the QgsPkiBundleclass. Hereafter a snippet to get password protected:
Refer to QgsPkiBundle class documentationto extract cert/key/CAs from the bundle.
We can remove an entry from Authentication Database using it'sauthcfg identifier with the following snippet:
The best way to use an Authentication Config stored in theAuthentication DB is referring it with the unique identifierauthcfg. Expanding, means convert it from an identifier to a completeset of credentials.The best practice to use stored Authentication Configs, is to leave itmanaged automatically by the Authentication manager.The common use of a stored configuration is to connect to an authenticationenabled service like a WMS or WFS or to a DB connection.
Note
Take into account that not all QGIS data providers are integrated with theAuthentication infrastructure. Aiseesoft video downloader 3 1 32 download free. Each authentication method, derived from thebase class QgsAuthMethodand support a different set of Providers. For example the certIdentity() method supports the following listof providers:
Sample output:
For example, to access a WMS service using stored credentials identified withauthcfg='fm1s770', we just have to use the authcfg in the data sourceURL like in the following snippet:
In the upper case, the wms provider will take care to expand authcfgURI parameter with credential just before setting the HTTP connection.
Warning
The developer would have to leave authcfg expansion to the QgsAuthManager, in this way he will be sure that expansion is not done too early.
Usually an URI string, built using the QgsDataSourceURIclass, is used to set a data source in the following way:
Note
Sniper App 1 3 4 – Snippets Manager Tasks Pdf
The False parameter is important to avoid URI complete expansion of theauthcfg id present in the URI.
Other example can be read directly in the QGIS tests upstream as intest_authmanager_pki_ows ortest_authmanager_pki_postgres.
Many third party plugins are using httplib2 or other Python networking libraries to manage HTTPconnections instead of integrating with QgsNetworkAccessManagerand its related Authentication Infrastructure integration.
To facilitate this integration a helper Python function has been createdcalled NetworkAccessManager. Its code can be found here.
This helper class can be used as in the following snippet:
In this paragraph are listed the available GUIs useful to integrateauthentication infrastructure in custom interfaces.
If it's necessary to select a Authentication Configuration from the setstored in the Authentication DB it is available in the GUI classQgsAuthConfigSelect.
and can be used as in the following snippet:
The above example is taken from the QGIS source code.The second parameter of the GUI constructor refers to data provider type. Theparameter is used to restrict the compatible Authentication Methods withthe specified provider.
The complete GUI used to manage credentials, authorities and to access toAuthentication utilities is managed by theQgsAuthEditorWidgets class.
and can be used as in the following snippet:
An integrated example can be found in the related test.
Sniper App 1 3 4 – Snippets Manager Tasks Free
A GUI used to manage only authorities is managed by theQgsAuthAuthoritiesEditor class.
Sniper App 1 3 4 – Snippets Manager Tasks List
Red giant magic bullet suite 13 0 15 inch. and can be used as in the following snippet:
