Implementing GetLegendGraphic operation

autotest/autotest_services/tests/wms/base.py

@@ -154,4 +154,26 @@ def testBandStatistics(self):
                 array1 = np.array(exp_band.ReadAsArray()).flatten()
                 array2 = np.array(res_band.ReadAsArray()).flatten()
                 regress_result = linregress(array1,array2)
-                self.assertGreaterEqual(regress_result.rvalue, 0.9)
+                self.assertGreaterEqual(regress_result.rvalue, 0.9)
+
+@tag('wms', 'wms13')
+class WMS13GetLegendTestCase(testbase.RasterTestCase):
+    layers = []
+    styles = []
+    frmt = "image/png"
+
+    def getFileExtension(self, part=None):
+        try:
+            return format_to_extension[self.frmt]
+        except KeyError:
+            return testbase.mimetypes.guess_extension(self.frmt, False)[1:]
+
+    def getRequest(self):
+        params = "service=WMS&request=GetMap&version=1.1.1&" \
+                 "layers=%s&styles=%s&format=%s" % (
+                     ",".join(self.layers), ",".join(self.styles), self.frmt
+                 )
+        if self.httpHeaders is None:
+            return (params, "kvp")
+        else:
+            return (params, "kvp", self.httpHeaders)

autotest/autotest_services/tests/wms/test_v13.py

@@ -403,9 +403,27 @@ def getRequest(self):
 #===============================================================================
 # Legend Graphic
 #===============================================================================
+class WMS13GetLegendGraphicTestCase(wmsbase.WMS13GetLegendTestCase):
+    """ Test a GetLegendGraphic request for a dataset with an associated style. """
 
-# currently disabled because of segfaults in MapServer
+    def getRequest(self):
+        params = "service=WMS&version=1.3.0&request=GetLegendGraphic&format=image/png&layer=ASA_WSM_1PNDPA20050331_075939_000000552036_00035_16121_0775"
+        return params, "kvp"
+
+    def getFileExtension(self, file_type):
+        return "png"
+
+class WMS13GetLegendGraphicStyledTestCase(wmsbase.WMS13GetLegendTestCase):
+    """ Test a GetLegendGraphic request for a dataset with an associated style. """
+
+    def getRequest(self):
+        params = "service=WMS&version=1.3.0&request=GetLegendGraphic&format=image/png&layer=ASA_WSM_1PNDPA20050331_075939_000000552036_00035_16121_0775&style=earth"
+        return params, "kvp"
 
+    def getFileExtension(self, file_type):
+        return "png"
+
+# currently disabled because of segfaults in MapServer
 
 class WMS13GetLegendGraphicDatasetStyledTestCase(testbase.RasterTestCase):
     """ Test a GetLegendGraphic request for a dataset with an associated style. """

eoxserver/render/map/config.py

@@ -29,3 +29,7 @@
 DEFAULT_EOXS_MAP_RENDERER = (
     "eoxserver.render.mapserver.map_renderer.MapserverMapRenderer"
 )
+
+DEFAULT_EOXS_LEGEND_RENDERER = (
+    "eoxserver.render.mapserver.map_renderer.MapserverMapRenderer"
+)

eoxserver/render/map/objects.py

@@ -370,6 +370,30 @@ def __repr__(self):
         )
 
 
+class Legend(object):
+    def __init__(self, layer, width, height, format):
+        self._layer = layer
+        self._width = width
+        self._height = height
+        self._format = format
+
+    @property
+    def layer(self):
+        return self._layer
+
+    @property
+    def width(self):
+        return self._width
+
+    @property
+    def height(self):
+        return self._height
+
+    @property
+    def format(self):
+        return self._format
+
+
 class LayerDescription(object):
     """ Abstract layer description
     """

eoxserver/render/map/renderer.py

@@ -28,10 +28,13 @@
 from django.conf import settings
 from django.utils.module_loading import import_string
 
-from eoxserver.render.map.config import DEFAULT_EOXS_MAP_RENDERER
+from eoxserver.render.map.config import (
+    DEFAULT_EOXS_MAP_RENDERER, DEFAULT_EOXS_LEGEND_RENDERER
+)
 
 
 MAP_RENDERER = None
+LEGEND_RENDERER = None
 
 
 def get_map_renderer():
@@ -44,3 +47,16 @@ def get_map_renderer():
         MAP_RENDERER = import_string(specifier)()
 
     return MAP_RENDERER
+
+
+def get_legend_renderer():
+    global LEGEND_RENDERER
+    if LEGEND_RENDERER is None:
+        specifier = getattr(
+            settings, 'EOXS_LEGEND_RENDERER', DEFAULT_EOXS_LEGEND_RENDERER
+        )
+
+        LEGEND_RENDERER = import_string(specifier)()
+
+    return LEGEND_RENDERER
+

eoxserver/render/mapserver/factories.py

@@ -298,7 +298,7 @@ def create(self, map_obj, layer):
             shape_obj = ms.shapeObj.fromWKT(coverage.footprint.wkt)
             outlines_layer_obj.addFeature(shape_obj)
 
-            class_obj = _create_geometry_class(vector_style)
+            class_obj = _create_geometry_class(vector_style, name='outlines')
             outlines_layer_obj.insertClass(class_obj)
 
         return coverage_layers
@@ -349,18 +349,20 @@ def make_browse_layer_generator(self, map_obj, browses, map_,
                     )
                 layer_objs = _create_raster_layer_objs(
                     map_obj, browse.extent, browse.spatial_reference,
-                    creation_info.filename, filename_generator
+                    creation_info.filename if creation_info else '',
+                    filename_generator
                 )
 
                 for layer_obj in layer_objs:
-                    layer_obj.data = creation_info.filename
-                    if creation_info.env:
-                        ms.set_env(map_obj, creation_info.env, True)
+                    if creation_info:
+                        layer_obj.data = creation_info.filename
+                        if creation_info.env:
+                            ms.set_env(map_obj, creation_info.env, True)
 
-                    if creation_info.bands:
-                        layer_obj.setProcessingKey('BANDS', ','.join(
-                            str(band) for band in creation_info.bands
-                        ))
+                        if creation_info.bands:
+                            layer_obj.setProcessingKey('BANDS', ','.join(
+                                str(band) for band in creation_info.bands
+                            ))
 
                     if reset_info:
                         sr = osr.SpatialReference(map_.crs)
@@ -377,43 +379,43 @@ def make_browse_layer_generator(self, map_obj, browses, map_,
                             layer_obj.setMetaData("wms_srs", short_epsg)
                         layer_obj.setProjection(sr.proj)
 
-                if browse.mode == BROWSE_MODE_GRAYSCALE:
-                    field = browse.field_list[0]
-                    if ranges:
-                        browse_range = ranges[0]
-                    elif browse.ranges[0] != (None, None):
-                        browse_range = browse.ranges[0]
-                    else:
-                        browse_range = _get_range(field)
-
-                    for layer_obj in layer_objs:
-                        _create_raster_style(
-                            style or "blackwhite", layer_obj,
-                            browse_range[0], browse_range[1],
-                            browse.nodata_values
-                        )
-
-                else:
-                    browse_iter = enumerate(
-                        zip(browse.field_list, browse.ranges), start=1
-                    )
-                    for i, (field, field_range) in browse_iter:
+                    if browse.mode == BROWSE_MODE_GRAYSCALE:
+                        field = browse.field_list[0]
                         if ranges:
-                            if len(ranges) == 1:
-                                range_ = ranges[0]
-                            else:
-                                range_ = ranges[i - 1]
-                        elif field_range != (None, None):
-                            range_ = field_range
+                            browse_range = ranges[0]
+                        elif browse.ranges[0] != (None, None):
+                            browse_range = browse.ranges[0]
                         else:
-                            range_ = _get_range(field)
+                            browse_range = _get_range(field)
 
                         for layer_obj in layer_objs:
-                            layer_obj.setProcessingKey(
-                                "SCALE_%d" % i,
-                                "%s,%s" % tuple(range_)
+                            _create_raster_style(
+                                style or "blackwhite", layer_obj,
+                                browse_range[0], browse_range[1],
+                                browse.nodata_values
                             )
 
+                    else:
+                        browse_iter = enumerate(
+                            zip(browse.field_list, browse.ranges), start=1
+                        )
+                        for i, (field, field_range) in browse_iter:
+                            if ranges:
+                                if len(ranges) == 1:
+                                    range_ = ranges[0]
+                                else:
+                                    range_ = ranges[i - 1]
+                            elif field_range != (None, None):
+                                range_ = field_range
+                            else:
+                                range_ = _get_range(field)
+
+                            for layer_obj in layer_objs:
+                                layer_obj.setProcessingKey(
+                                    "SCALE_%d" % i,
+                                    "%s,%s" % tuple(range_)
+                                )
+
             elif isinstance(browse, Browse):
                 layer_objs = _create_raster_layer_objs(
                     map_obj, browse.extent, browse.spatial_reference,
@@ -491,7 +493,7 @@ def create(self, map_obj, layer):
             shape_obj = ms.shapeObj.fromWKT(browse.footprint.wkt)
             outlines_layer_obj.addFeature(shape_obj)
 
-            class_obj = _create_geometry_class(vector_style)
+            class_obj = _create_geometry_class(vector_style, name='outlines')
             outlines_layer_obj.insertClass(class_obj)
 
         return filename_generator
@@ -621,7 +623,8 @@ def create(self, map_obj, layer):
             layer_obj.addFeature(shape_obj)
 
         class_obj = _create_geometry_class(
-            layer.style or 'red', fill_opacity=layer.fill
+            layer.style or 'red', fill_opacity=layer.fill,
+            name='outlines',
         )
         layer_obj.insertClass(class_obj)
 
@@ -699,8 +702,10 @@ def _create_polygon_layer(map_obj):
 
 
 def _create_geometry_class(color_name, background_color_name=None,
-                           fill_opacity=None):
+                           fill_opacity=None, name=None):
     cls_obj = ms.classObj()
+    if name is not None:
+        cls_obj.name = name
     outline_style_obj = ms.styleObj()
 
     try:
@@ -820,6 +825,9 @@ def _create_raster_style(name, layer, minvalue=0, maxvalue=255,
             (minvalue + next_perc * interval)
         ))
         cls.group = name
+        cls.name = "%s - %s" % (
+            (minvalue + prev_perc * interval),
+            (minvalue + next_perc * interval))
 
         style = ms.styleObj()
         style.mincolor = ms.colorObj(*prev_color)