[processing] fix gdalwarp handling of custom projection for target extent

gkimbell · nyalldawson · commit d95e8843ccec · 2019-09-09T09:49:09.000+10:00
Fixes #31276 (cherry picked from commit 283c8b8)
diff --git a/python/plugins/processing/algs/gdal/warp.py b/python/plugins/processing/algs/gdal/warp.py
@@ -215,9 +215,9 @@ def getConsoleCommands(self, parameters, context, feedback, executing=True):
             arguments.append(extent.yMaximum())
 
             extentCrs = self.parameterAsCrs(parameters, self.TARGET_EXTENT_CRS, context)
-            if extentCrs:
+            if extentCrs.isValid():
                 arguments.append('-te_srs')
-                arguments.append(extentCrs.authid())
+                arguments.append(GdalUtils.gdal_crs_string(extentCrs))
 
         if self.parameterAsBoolean(parameters, self.MULTITHREADING, context):
             arguments.append('-multi')
diff --git a/python/plugins/processing/tests/GdalAlgorithmsTest.py b/python/plugins/processing/tests/GdalAlgorithmsTest.py
@@ -2225,6 +2225,20 @@ def testWarp(self):
                  source + ' ' +
                  outdir + '/check.jpg'])
 
+            # with target using custom projection and user-defined extent
+            custom_crs2 = 'proj4: +proj=longlat +a=6378388 +b=6356912 +no_defs'
+            self.assertEqual(
+                alg.getConsoleCommands({'INPUT': source,
+                                        'SOURCE_CRS': custom_crs2,
+                                        'TARGET_CRS': custom_crs2,
+                                        'TARGET_EXTENT': '18.67,18.70,45.78,45.81',
+                                        'TARGET_EXTENT_CRS': custom_crs2,
+                                        'OUTPUT': outdir + '/check.tif'}, context, feedback),
+                ['gdalwarp',
+                 '-s_srs "+proj=longlat +a=6378388 +b=6356912 +no_defs" -t_srs "+proj=longlat +a=6378388 +b=6356912 +no_defs" -r near -te 18.67 45.78 18.7 45.81 -te_srs "+proj=longlat +a=6378388 +b=6356912 +no_defs" -of GTiff ' +
+                 source + ' ' +
+                 outdir + '/check.tif'])
+
             # with non-EPSG crs code
             self.assertEqual(
                 alg.getConsoleCommands({'INPUT': source,
