WIP: metadata validation.

lib/galaxy/tools/parameters/validation.py

@@ -559,7 +559,32 @@ class MetadataValidator(Validator):
             super().validate(isinstance(value, model.DatasetInstance) and not missing, value_to_show=missing)
 
 
-class UnspecifiedBuildValidator(Validator):
+class MetadataEqualsValidator(Validator):
+    """
+    """
+    requires_dataset_metadata = True
+
+    def __init__(self, metadata_name=None, value=None, message=None):
+        self.metadata_name = metadata_name
+        self.value = value
+        self.message = message or 'Metadata value for (%s) must be (%s) and is not.' % (metadata_name, value)
+
+    @classmethod
+    def from_element(cls, param, elem):
+        return cls(
+            metadata_name=elem.get('metadata_name', None),
+            value=elem.get('value', None),
+            message=elem.get('message', None),
+        )
+
+    def validate( self, value, trans=None ):
+        if value:
+            metdata_value = getattr(value.metadata, self.metadata_name)
+            if metdata_value != self.value:
+                raise ValueError( self.message )
+
+
+class UnspecifiedBuildValidator( Validator ):
     """
     Validator that checks for dbkey not equal to '?'
 
@@ -949,6 +974,7 @@ validator_types = dict(
     in_range=InRangeValidator,
     length=LengthValidator,
     metadata=MetadataValidator,
+    metadata_eq=MetadataEqualsValidator,
     unspecified_build=UnspecifiedBuildValidator,
     no_options=NoOptionsValidator,
     empty_field=EmptyTextfieldValidator,

test/functional/tools/metadata_check_eq.xml

@@ -0,0 +1,29 @@
+<tool id="metadata_check_eq" name="metadata_check_eq" version="1.0.0">
+    <description>Tests whether asserting metadata equals something works.</description>
+    <command><![CDATA[
+        cp '$input' '$output'
+    ]]></command>
+    <inputs>
+        <param name="input" type="data" multiple="false" format="tabular,csv">
+            <validator type="metdata_eq" metadata_name="delimiter" value="&#x9;" />
+        </param>
+    </inputs>
+    <outputs>
+        <data format="tabular" name="output" format_source="input">
+        </data>
+    </outputs>
+    <tests>
+        <test>
+            <param name="input" value="1.tabular" format="tabular" />
+            <output name="output">
+                <metadata name="delimiter" value="&#x9;"/>
+            </output>
+        </test>
+        <test>
+            <param name="input" value="1.csv" format="csv" />
+            <output name="output">
+                <metadata name="delimiter" value="&#x9;"/>
+            </output>
+        </test>
+    </tests>
+</tool>

test/functional/tools/sample_tool_conf.xml

@@ -72,6 +72,7 @@
   <tool file="metadata_bcf.xml" />
   <tool file="metadata_bed.xml" />
   <tool file="metadata_biom1.xml" />
+  <tool file="metadata_check_eq.xml" />
   <tool file="metadata_column_names.xml" />
   <tool file="strict_shell.xml" />
   <tool file="strict_shell_default_off.xml" />