Make http types directives analysable

The syntax of `http` `types` blocks is distinct, in that their child
directives are arbitrary MIME types - they therefore can't be analysed
when `strict` or `check_ctx` are enabled, and no meaningful analysis can
be performed when `check_args` is enabled because the arity of child
directives is unknown. Skip the checks performed when `strict` and
`check_ctx` are enabled, and hint to the analyser that all directives
inside a `types` block accept one or more arguments so that a meaningful
check can be performed when `check_args` is enabled.

Fixes nginxinc#101.

crossplane/analyzer.py

@@ -2126,23 +2126,26 @@ def analyze(fname, stmt, term, ctx=(), strict=False, check_ctx=True,
     directive = stmt['directive']
     line = stmt['line']
 
-    # if strict and directive isn't recognized then throw error
-    if strict and directive not in DIRECTIVES:
-        reason = 'unknown directive "%s"' % directive
-        raise NgxParserDirectiveUnknownError(reason, fname, line)
+    ctx_http_types = len(ctx) >= 2 and ctx[0] == 'http' and ctx[-1] == 'types'
 
-    # if we don't know where this directive is allowed and how
-    # many arguments it can take then don't bother analyzing it
-    if ctx not in CONTEXTS or directive not in DIRECTIVES:
-        return
+    if not ctx_http_types:
+        # if strict and directive isn't recognized then throw error
+        if strict and directive not in DIRECTIVES:
+            reason = 'unknown directive "%s"' % directive
+            raise NgxParserDirectiveUnknownError(reason, fname, line)
+
+        # if we don't know where this directive is allowed and how
+        # many arguments it can take then don't bother analyzing it
+        if ctx not in CONTEXTS or directive not in DIRECTIVES:
+            return
 
     args = stmt.get('args') or []
     n_args = len(args)
 
-    masks = DIRECTIVES[directive]
+    masks = [NGX_CONF_1MORE] if ctx_http_types else DIRECTIVES[directive]
 
     # if this directive can't be used in this context then throw an error
-    if check_ctx:
+    if not ctx_http_types and check_ctx:
         masks = [mask for mask in masks if mask & CONTEXTS[ctx]]
         if not masks:
             reason = '"%s" directive is not allowed here' % directive

tests/configs/types/nginx.conf

@@ -0,0 +1,7 @@
+http {
+    types {
+        text/html  html;
+        image/gif  gif;
+        image/jpeg jpg jpeg;
+    }
+}

tests/test_build.py

@@ -226,6 +226,49 @@ def test_build_multiple_comments_on_one_line():
     assert built == '#comment1\nuser root; #comment2 #comment3'
 
 
+def test_build_types():
+    payload = [
+        {
+            'directive': 'http',
+            'line': 1,
+            'args': [],
+            'block': [
+                {
+                    'directive': 'types',
+                    'line': 2,
+                    'args': [],
+                    'block': [
+                        {
+                            'directive': 'text/html',
+                            'line': 3,
+                            'args': ['html']
+                        },
+                        {
+                            'directive': 'image/gif',
+                            'line': 4,
+                            'args': ['gif']
+                        },
+                        {
+                            'directive': 'image/jpeg',
+                            'line': 5,
+                            'args': ['jpg', 'jpeg']
+                        }
+                    ]
+                }
+            ]
+        }
+    ]
+    built = crossplane.build(payload, indent=4, tabs=False)
+    assert built == '\n'.join([
+        'http {',
+        '    types {',
+        '        text/html html;',
+        '        image/gif gif;',
+        '        image/jpeg jpg jpeg;',
+        '    }',
+        '}'
+    ])
+
 
 def test_build_files_with_missing_status_and_errors(tmpdir):
     assert len(tmpdir.listdir()) == 0

tests/test_parse.py

@@ -975,3 +975,58 @@ def test_comments_between_args():
             }
         ]
     }
+
+
+def test_types_checks():
+    dirname = os.path.join(here, 'configs', 'types')
+    config = os.path.join(dirname, 'nginx.conf')
+    payload = crossplane.parse(
+        config,
+        strict=True,
+        check_ctx=True,
+        check_args=True,
+    )
+
+    # Check that strict mode doesn't raise errors when parsing http types blocks
+    assert payload == {
+        'status': 'ok',
+        'errors': [],
+        'config': [
+            {
+                'file': os.path.join(dirname, 'nginx.conf'),
+                'status': 'ok',
+                'errors': [],
+                'parsed': [
+                    {
+                        'directive': 'http',
+                        'line': 1,
+                        'args': [],
+                        'block': [
+                            {
+                                'directive': 'types',
+                                'line': 2,
+                                'args': [],
+                                'block': [
+                                    {
+                                        'directive': 'text/html',
+                                        'line': 3,
+                                        'args': ['html']
+                                    },
+                                    {
+                                        'directive': 'image/gif',
+                                        'line': 4,
+                                        'args': ['gif']
+                                    },
+                                    {
+                                        'directive': 'image/jpeg',
+                                        'line': 5,
+                                        'args': ['jpg', 'jpeg']
+                                    }
+                                ]
+                            }
+                        ]
+                    }
+                ]
+            }
+        ]
+    }