validate: add validate-sections to validate misspelled directives or …

…directives in reana.yaml

Closes reanahub#562

reana_client/utils.py

@@ -123,7 +123,11 @@ def _prepare_kwargs(reana_yaml):
     try:
         with open(filepath) as f:
             reana_yaml = yaml.load(f.read(), Loader=yaml.FullLoader)
-
+        try:
+            _validate_sections(reana_yaml)
+        except REANAValidationError as e:
+            display_message(e.message, msg_type="error")
+            sys.exit(1)
         workflow_type = reana_yaml["workflow"]["type"]
         reana_yaml["workflow"]["specification"] = load_workflow_spec(
             workflow_type,
@@ -435,3 +439,45 @@ def _validate_workspace(workspace, access_token):
     except REANAValidationError as e:
         display_message(e.message, msg_type="error")
         sys.exit(1)
+
+
+def _validate_sections(reana_yaml):
+    """Validate sections of the REANA specification file.
+
+    :param reana_yaml: Dictionary which represents REANA specifications file.
+    :raises ValidationError: Given sections in REANA spec file do not validate.
+    """
+    inputs_sections = ["directories", "files", "parameters", "options"]
+    workflow_sections = ["type", "file", "specification"]
+    outputs_sections = ["directories", "files"]
+    workspace_sections = ["root_path"]
+    sections = {
+        "version": None,
+        "inputs": inputs_sections,
+        "workflow": workflow_sections,
+        "outputs": outputs_sections,
+        "workspace": workspace_sections,
+    }
+    incorrect_sections = [
+        section for section in reana_yaml.keys() if section not in sections.keys()
+    ]
+    if len(incorrect_sections) != 0:
+        raise REANAValidationError(
+            'The `reana.yaml` directive "{0}" not valid.'.format(
+                ", ".join(incorrect_sections)
+            )
+        )
+    incorrect_subsections = []
+    for section in reana_yaml.keys():
+        if isinstance(reana_yaml[section], dict):
+            incorrect_subsections = incorrect_subsections + [
+                ".".join((section, subsection))
+                for subsection in reana_yaml[section].keys()
+                if subsection not in sections[section]
+            ]
+    if len(incorrect_subsections) != 0:
+        raise REANAValidationError(
+            'The `reana.yaml` directive "{0}" not valid.'.format(
+                ", ".join(incorrect_subsections)
+            )
+        )