source: MILK/trunk/milk_server/milk_server/config/milkMiddleware.py @ 4625

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/MILK/trunk/milk_server/milk_server/config/milkMiddleware.py@4625
Revision 4625, 7.3 KB checked in by cbyrom, 11 years ago (diff)

Improve error handling in the atom controllers + refactor ndgInterface
to remove code from constructor to allow dependency injection - to
improve flexibility and testability. Also, change ambiguous naming
references in classes to minimise codeword overaps/confusion.
Line 
1'''
2Class defining the config params for the milk server
3'''
4from paste.deploy import CONFIG
5from ndgUtils.models.myconfig import myConfig
6from ndgUtils.lib.atomvalidator import AtomValidator
7import milk_server.lib.helpers as h
8
9class NDGConfigError(Exception): 
10    '''Errors related to reading from ndg config file'''
11     
12class milkMiddleware:
13   
14    def __init__(self, app, g, app_conf):
15       
16        #this is the next application in the wsgi stack
17        self.app=app
18       
19        #set up the ndg configuration file
20        cf= CONFIG['app_conf']['configfile']
21        cf=myConfig(cf)
22     
23        self.globals=g
24        self.globals.htdocs=cf.get('DEFAULT','htdocs',None)
25        self.globals.localLink=cf.get('layout','localLink',None)
26        self.globals.localAlt=cf.get('layout','localAlt','Visit Local Site')
27        self.globals.ndgLink=cf.get('layout','ndgLink','http://ndg.nerc.ac.uk')
28        self.globals.ndgImage=cf.get('layout','ndgImage',None)
29        self.globals.ndgAlt=cf.get('layout','ndgAlt','Visit NDG')
30        self.globals.stfcLink=cf.get('layout','stfcLink')
31        self.globals.stfcImage=cf.get('layout','stfcImage')
32        self.globals.helpIcon=cf.get('layout','helpIcon')
33        self.globals.navPlus=cf.get('layout','navPlus')
34        self.globals.loadingIcon=cf.get('layout','loadingIcon')
35        self.globals.navMinus=cf.get('layout','navMinus')
36        self.globals.LeftAlt=cf.get('layout','HdrLeftAlt')
37        self.globals.LeftLogo=cf.get('layout','HdrLeftLogo')
38        self.globals.pageLogo="bodcHdr"
39        self.globals.icons_xml=cf.get('layout','Xicon')
40        self.globals.icons_plot=cf.get('layout','plot')
41        self.globals.icons_prn=cf.get('layout','printer')
42        self.globals.icons_A=cf.get('NDG_A_SERVICE','icon')
43        self.globals.icons_B=cf.get('NDG_B_SERVICE','icon')
44        self.globals.icons_D=cf.get('DISCOVERY','icon')
45        self.globals.icons_R=cf.get('RELATED','icon')
46        self.globals.icons_key=cf.get('layout','key')
47       
48        self.globals.atomEditorEnabled = cf.get('ATOM_EDITOR','enabled')
49        self.globals.debugAtomEditor = cf.get('ATOM_EDITOR','debug') or False
50
51        self.globals.wmcClientURL = cf.get('WMC_CLIENT','url')
52       
53        self.globals.disclaimer=cf.get('default','disclaimer')
54       
55        self.globals.discoveryURL=cf.get('SEARCH','discoveryURL')
56       
57        self.globals.server=cf.get('DEFAULT','server','')
58
59        # for standalone discovery
60        self.globals.standalone=cf.config.getboolean('DISCOVERY','standalone')
61
62        # NB, without this set, the default host on ndg.badc.rl.ac.uk will be used by ndgSearch
63        if cf.config.has_option('DISCOVERY', 'discoveryServiceURL'):
64            self.globals.discoveryServiceURL = \
65                cf.config.get('DISCOVERY', 'discoveryServiceURL')
66               
67        self.globals.pwFile = cf.get('NDG_EXIST','passwordFile')
68        # set up the validator for atoms - to allow re-use across the app
69        self.globals.validator = AtomValidator(None, self.globals.pwFile, \
70                                       newLineChar="<br/>",
71                                       isDebug = self.globals.debugAtomEditor)
72
73        # initialise collection to store re-usable connections to the eXist DB
74        self.globals.eXistDBCons = {}
75       
76        # Security Related
77
78        # Single Sign On settings - check for mode of operation:
79        # 1) act as a client to a separate Single Sign On Service
80        # or
81        # 2) Single Sign On service is integrated into THIS service
82        securityEnabled = not self.globals.standalone
83        isSSOClient = cf.config.has_section('NDG_SECURITY.ssoClient') and \
84            securityEnabled
85           
86        isSSOService = cf.config.has_section('NDG_SECURITY.ssoService') and \
87            securityEnabled
88           
89        if isSSOClient and isSSOService:
90            raise NDGConfigError(\
91                "NDG_SECURITY.ssoClient and NDG_SECURITY.ssoService " + \
92                "sections are present in the NDG Config file: " + \
93                "only one or the other may be set")
94 
95        if isSSOClient:
96            try:
97                from \
98            ndg.security.client.ssoclient.ssoclient.config.ssoClientMiddleware\
99                    import SSOMiddleware
100            except ImportError, e:
101                # If standalone flag is not present security must be enabled
102                raise NDGConfigError(\
103                    '%s: importing Single Sign On Client SSOMiddleware: %s' % \
104                        (__name__, e))
105                       
106               
107            self.app = SSOMiddleware(app, cf.config, g, app_conf,
108                                     defSection='NDG_SECURITY.ssoClient')
109           
110            self.globals.sslServer = g.ndg.security.common.sso.cfg.sslServer
111            self.globals.wayfuri=g.ndg.security.common.sso.cfg.wayfuri
112            self.globals.logout=g.ndg.security.common.sso.cfg.logoutURI
113           
114        elif isSSOService:
115            try:
116                from ndg.security.server.sso.sso.config.ssoServiceMiddleware \
117                    import SSOMiddleware
118            except ImportError, e:
119                # If standalone flag is not present security must be enabled
120                raise NDGConfigError(\
121                    '%s: importing Single Sign On Service SSOMiddleware: %s' %\
122                        (__name__, e))
123                       
124               
125            self.app = SSOMiddleware(app, g, app_conf,
126                                     defSection='NDG_SECURITY.ssoService',
127                                     wssSection='NDG_SECURITY.wssecurity')
128           
129            self.globals.sslServer=g.ndg.security.server.sso.cfg.sslServer
130            self.globals.wayfuri=g.ndg.security.server.sso.cfg.wayfuri
131            self.globals.logout=g.ndg.security.server.sso.cfg.logoutURI
132            self.globals.getCredentials=g.ndg.security.server.sso.cfg.getCredentials
133
134        # Policy Enforcement Point initialisation
135        if securityEnabled:
136            try:
137                from ndg.security.common.authz.pep import PEP
138            except ImportError, e:
139                # If standalone flag is not present security must be enabled
140                raise NDGConfigError('%s: expecting standalone config ' % \
141                        __name__ + 
142                        'flag set to False for Policy Enforcement Point ' + \
143                        'import: %s' % e)
144           
145            self.globals.pep = PEP(cfg=cf.config, 
146                                   cfgSection='NDG_SECURITY.gatekeeper')
147           
148        self.config=cf
149       
150        self.__setUpHelpText(g)
151
152
153    def __setUpHelpText(self, g):
154       
155        cf = CONFIG['app_conf']['helpConfigfile']
156        cf = myConfig(cf)
157        # NB, the cf.config class lowercases everything.
158        for (section, val) in cf.config.items('ATOM_EDITOR'):
159            setattr(g, section, val)
160           
161        # extend the granulite example link - to add a valid location
162        g.example_granulite = g.example_granulite.replace('HREF', \
163            h.url_for(controller = 'atom_editor/listatom', \
164                      action='showExampleGranulite'))
165       
166       
167    def __call__(self,environ,start_response):
168       
169        environ['ndgConfig']=self.config
170        return self.app(environ,start_response)
171   
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