Add header support

Add support for adding extra headers with '-H' or '--header'.
The flag can be specified multiple times to add multiple headers

README.md

@@ -49,6 +49,8 @@ Options:
   -o, --output PATH  Directory to store schema files
   -p, --prefix TEXT  Prefix for JSON references (only for OpenAPI versions
                      before 3.0)
+  -H, --header TEXT  Extra header to use when getting a schema. May be
+                     specified multiple times.
   --stand-alone      Whether or not to de-reference JSON schemas
   --kubernetes       Enable Kubernetes specific processors
   --strict           Prohibits properties not in the schema

openapi2jsonschema/command.py

@@ -16,6 +16,7 @@
     allow_null_optional_fields,
     change_dict_values,
     append_no_duplicates,
+    parse_headers
 )
 from openapi2jsonschema.errors import UnsupportedError
 
@@ -34,6 +35,12 @@
     default="_definitions.json",
     help="Prefix for JSON references (only for OpenAPI versions before 3.0)",
 )
+@click.option(
+    "-H",
+    "--header",
+    multiple=True,
+    help="Extra header to use when getting a schema. May be specified multiple times.",
+)
 @click.option(
     "--stand-alone", is_flag=True, help="Whether or not to de-reference JSON schemas"
 )
@@ -49,7 +56,7 @@
     help="Prohibits properties not in the schema (additionalProperties: false)",
 )
 @click.argument("schema", metavar="SCHEMA_URL")
-def default(output, schema, prefix, stand_alone, expanded, kubernetes, strict):
+def default(output, schema, prefix, header, stand_alone, expanded, kubernetes, strict):
     """
     Converts a valid OpenAPI specification into a set of JSON Schema files
     """
@@ -59,7 +66,11 @@ def default(output, schema, prefix, stand_alone, expanded, kubernetes, strict):
     else:
         if os.path.isfile(schema):
             schema = "file://" + os.path.realpath(schema)
-        req = urllib.request.Request(schema)
+        if header:
+            headers = parse_headers(header)
+            req = urllib.request.Request(schema, headers=headers)
+        else:
+            req = urllib.request.Request(schema)
         response = urllib.request.urlopen(req)
 
     info("Parsing schema")

openapi2jsonschema/util.py

@@ -108,3 +108,18 @@ def append_no_duplicates(obj, key, value):
         obj[key] = []
     if value not in obj[key]:
         obj[key].append(value)
+
+
+def parse_headers(header):
+    """
+    Argument is a tuple of header strings.
+    e.g. ('Content-Type: application/json', 'Accept: application/text')
+    Invalid headers are ignored.
+    The function returns a dictionary of the headers.
+    """
+    res = {}
+    for h in header:
+        h = h.split(":", 1)
+        if len(h) == 2:
+            res[h[0].strip()] = h[1].strip()
+    return res