merge: Add PatternFly 4 web interface (#161)

This pull requests adds the new web interface based on the PatternFly 4 design framework.
This framework enables us to develop more quickly the interfaces necessary in OpenDC. 

* Remove the OpenDC landing page from the web interface module
* Add support for the PatternFly 4 framework in Next.js
* Relax topology schema requirements
* Migrate UI components to PatternFly 4

3 files changed, 177 insertions, 0 deletions

diff --git a/opendc-web/opendc-web-ui/src/components/util/BreadcrumbLink.js b/opendc-web/opendc-web-ui/src/components/util/BreadcrumbLink.js
new file mode 100644
index 00000000..c6ab214a
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/components/util/BreadcrumbLink.js
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import PropTypes from 'prop-types'
+import Link from 'next/link'
+
+const BreadcrumbLink = ({ children, href, ...props }) => (
+    <Link href={href}>
+        <a {...props}>{children}</a>
+    </Link>
+)
+
+BreadcrumbLink.propTypes = {
+    children: PropTypes.node,
+    href: PropTypes.string.isRequired,
+}
+
+export default BreadcrumbLink
diff --git a/opendc-web/opendc-web-ui/src/components/util/NavItemLink.js b/opendc-web/opendc-web-ui/src/components/util/NavItemLink.js
new file mode 100644
index 00000000..c0d109bd
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/components/util/NavItemLink.js
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import Link from 'next/link'
+import PropTypes from 'prop-types'
+
+const NavItemLink = ({ children, href, ...props }) => (
+    <Link href={href}>
+        <a {...props}>{children}</a>
+    </Link>
+)
+
+NavItemLink.propTypes = {
+    children: PropTypes.node,
+    href: PropTypes.string.isRequired,
+}
+
+export default NavItemLink
diff --git a/opendc-web/opendc-web-ui/src/components/util/TableEmptyState.js b/opendc-web/opendc-web-ui/src/components/util/TableEmptyState.js
new file mode 100644
index 00000000..9d16ffbb
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/components/util/TableEmptyState.js
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import PropTypes from 'prop-types'
+import { Bullseye, EmptyState, EmptyStateBody, EmptyStateIcon, Spinner, Title } from '@patternfly/react-core'
+import { SearchIcon, CubesIcon } from '@patternfly/react-icons'
+import { Status } from '../../shapes'
+
+function TableEmptyState({
+    status,
+    isFiltering,
+    loadingTitle = 'Loading',
+    emptyTitle = 'No results found',
+    emptyText = 'No results found of this type.',
+    emptyAction = '',
+}) {
+    if (status === 'loading') {
+        return (
+            <Bullseye>
+                <EmptyState variant="xs">
+                    <EmptyStateIcon variant="container" component={Spinner} />
+                    <Title headingLevel="h4" size="md">
+                        {loadingTitle}
+                    </Title>
+                </EmptyState>
+            </Bullseye>
+        )
+    } else if (status === 'error') {
+        return (
+            <EmptyState variant="xs">
+                <Title headingLevel="h4" size="md">
+                    Unable to connect
+                </Title>
+                <EmptyStateBody>
+                    There was an error retrieving data. Check your connection and try again.
+                </EmptyStateBody>
+            </EmptyState>
+        )
+    } else if (status === 'idle') {
+        return (
+            <EmptyState variant="xs">
+                <EmptyStateIcon icon={CubesIcon} />
+                <Title headingLevel="h4" size="md">
+                    {emptyTitle}
+                </Title>
+                <EmptyStateBody>No results available at this moment.</EmptyStateBody>
+            </EmptyState>
+        )
+    } else if (isFiltering) {
+        return (
+            <EmptyState variant="xs">
+                <EmptyStateIcon icon={SearchIcon} />
+                <Title headingLevel="h4" size="md">
+                    No results found
+                </Title>
+                <EmptyStateBody>
+                    No results match this filter criteria. Remove all filters or clear all filters to show results.
+                </EmptyStateBody>
+            </EmptyState>
+        )
+    }
+
+    return (
+        <EmptyState variant="xs">
+            <EmptyStateIcon icon={CubesIcon} />
+            <Title headingLevel="h4" size="md">
+                {emptyTitle}
+            </Title>
+            <EmptyStateBody>{emptyText}</EmptyStateBody>
+            {emptyAction}
+        </EmptyState>
+    )
+}
+
+TableEmptyState.propTypes = {
+    status: Status.isRequired,
+    isFiltering: PropTypes.bool,
+    loadingTitle: PropTypes.string,
+    emptyTitle: PropTypes.string,
+    emptyText: PropTypes.string,
+    emptyAction: PropTypes.node,
+}
+
+export default TableEmptyState