1 | from pylons import Response, c, g, cache, request, session |
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2 | from pylons.controllers import WSGIController |
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3 | from pylons.decorators import jsonify, validate |
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4 | from pylons.templating import render, render_response |
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5 | from pylons.helpers import abort, redirect_to, etag_cache |
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6 | from pylons.i18n import N_, _, ungettext |
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7 | import ows_server.models as model |
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8 | import ows_server.lib.helpers as h |
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9 | |
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10 | from ows_common import exceptions as OWS_E |
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11 | from ows_common.operations_metadata import OperationsMetadata, Operation, RequestMethod |
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12 | from ows_common.get_capabilities import ServiceMetadata |
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13 | import ows_common.xml |
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14 | from elementtree import ElementTree as ET |
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15 | |
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16 | class BaseController(WSGIController): |
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17 | def __call__(self, environ, start_response): |
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18 | # Insert any code to be run per request here. The Routes match |
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19 | # is under environ['pylons.routes_dict'] should you want to check |
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20 | # the action or route vars here |
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21 | return WSGIController.__call__(self, environ, start_response) |
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22 | |
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23 | class OwsController(BaseController): |
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24 | def __call__(self, environ, start_response): |
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25 | |
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26 | # All OWS parameter names are case insensitive. |
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27 | req = request._current_obj() |
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28 | self.ows_params = {} |
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29 | for k in req.params: |
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30 | self.ows_params[k.lower()] = req.params[k] |
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31 | |
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32 | try: |
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33 | self._fixOwsAction(environ) |
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34 | return super(OwsController, self).__call__(environ, start_response) |
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35 | except OWS_E.OwsError, e: |
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36 | return render_response('exception_report', report=e.report, |
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37 | format='xml') |
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38 | |
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39 | |
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40 | def _fixOwsAction(self, environ): |
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41 | # Override the Routes action from the request query parameter |
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42 | try: |
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43 | action = self.ows_params['request'] |
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44 | except KeyError: |
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45 | raise OWS_E.MissingParameterValue('REQUEST parameter not specified', 'REQUEST') |
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46 | |
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47 | # Check action is a method in self |
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48 | if not getattr(self, action): |
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49 | raise OWS_E.InvalidParameterValue('request=%s not supported' % action, 'REQUEST') |
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50 | |
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51 | # override routes action with request |
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52 | environ['pylons.routes_dict']['action'] = action |
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53 | del self.ows_params['request'] |
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54 | |
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55 | def _loadCapabilities(self): |
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56 | """ |
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57 | creates an ows_common.get_capabilities.ServiceMetadata object |
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58 | by consulting the paste configuration and annotations in the |
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59 | controller definition. |
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60 | |
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61 | """ |
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62 | |
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63 | # Deduce ows_endpoint from routes |
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64 | ows_endpoint = h.url_for(controller=request.environ['pylons.routes_dict']['controller']) |
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65 | |
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66 | # Get the server-level configuration data from an XML file |
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67 | config = request.environ['paste.config'] |
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68 | sm_tree = ET.parse(config['ows_common_config']) |
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69 | sm = ows_common.xml.service_metadata(sm_tree.getroot()) |
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70 | |
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71 | # Extract service-level parameters and constraint |
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72 | parameters = getattr(self, '_ows_parameters', {}) |
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73 | constraints = getattr(self, '_ows_constraints', {}) |
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74 | versions = getattr(self, '_ows_versions', []) |
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75 | |
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76 | # Extract operation-level parameters and constraints |
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77 | od = {} |
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78 | for attr in dir(self): |
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79 | op = getattr(self, attr) |
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80 | if hasattr(op, '_ows_name'): |
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81 | p = getattr(op, '_ows_parameters', {}) |
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82 | c = getattr(op, '_ows_constraints', {}) |
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83 | od[op._ows_name] = Operation(get=RequestMethod(href=ows_endpoint), |
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84 | post=None, |
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85 | parameters=p, |
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86 | constraints=c) |
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87 | |
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88 | sm.operationsMetadata = OperationsMetadata(od, constraints, parameters) |
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89 | sm.serviceIdentification.serviceTypeVersions = versions |
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90 | |
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91 | return sm |
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92 | |
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93 | def _renderCapabilities(self, template='ows/get_capabilities'): |
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94 | """ |
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95 | The standard way of returning a Capabilities document. |
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96 | |
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97 | Each subclass should implement self._load_capabilities() and call |
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98 | this method to return a response object. |
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99 | |
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100 | """ |
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101 | c.service_metadata = self._loadCapabilities() |
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102 | |
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103 | r = render_response(template, format='xml') |
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104 | r.headers['content-type'] = 'text/xml' |
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105 | return r |
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106 | |
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107 | |
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108 | # Include the '_' function in the public names |
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109 | __all__ = [__name for __name in locals().keys() if not __name.startswith('_') \ |
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110 | or __name == '_'] |
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