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# Copyright (C) 2015-2020 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU Affero General Public License version 3, or any later version
# See top-level LICENSE file for more information
from collections import defaultdict
import functools
from functools import wraps
import os
import re
import textwrap
from typing import List
import docutils.nodes
import docutils.parsers.rst
import docutils.utils
from rest_framework.decorators import api_view
from swh.web.api.apiresponse import make_api_response
from swh.web.api.apiurls import APIUrls
from swh.web.common.utils import parse_rst
class _HTTPDomainDocVisitor(docutils.nodes.NodeVisitor):
"""
docutils visitor for walking on a parsed rst document containing sphinx
httpdomain roles. Its purpose is to extract relevant info regarding swh
api endpoints (for instance url arguments) from their docstring written
using sphinx httpdomain.
"""
# httpdomain roles we want to parse (based on sphinxcontrib.httpdomain 1.6)
parameter_roles = ("param", "parameter", "arg", "argument")
request_json_object_roles = ("reqjsonobj", "reqjson", "<jsonobj", "<json")
request_json_array_roles = ("reqjsonarr", "<jsonarr")
response_json_object_roles = ("resjsonobj", "resjson", ">jsonobj", ">json")
response_json_array_roles = ("resjsonarr", ">jsonarr")
query_parameter_roles = ("queryparameter", "queryparam", "qparam", "query")
request_header_roles = ("<header", "reqheader", "requestheader")
response_header_roles = (">header", "resheader", "responseheader")
status_code_roles = ("statuscode", "status", "code")
def __init__(self, document, data):
super().__init__(document)
self.data = data
self.args_set = set()
self.params_set = set()
self.inputs_set = set()
self.returns_set = set()
self.status_codes_set = set()
self.reqheaders_set = set()
self.resheaders_set = set()
self.field_list_visited = False
self.current_json_obj = None
def process_paragraph(self, par):
"""
Process extracted paragraph text before display.
Cleanup document model markups and transform the
paragraph into a valid raw rst string (as the apidoc
documentation transform rst to html when rendering).
"""
par = par.replace("\n", " ")
# keep emphasized, strong and literal text
par = par.replace("<emphasis>", "*")
par = par.replace("</emphasis>", "*")
par = par.replace("<strong>", "**")
par = par.replace("</strong>", "**")
par = par.replace("<literal>", "``")
par = par.replace("</literal>", "``")
# keep links to web pages
if "<reference" in par:
par = re.sub(
r'<reference name="(.*)" refuri="(.*)".*</reference>',
r"`\1 <\2>`_",
par,
)
# remove parsed document markups but keep rst links
par = re.sub(r"<[^<]+?>(?!`_)", "", par)
# api urls cleanup to generate valid links afterwards
subs_made = 1
while subs_made:
(par, subs_made) = re.subn(r"(:http:.*)(\(\w+\))", r"\1", par)
subs_made = 1
while subs_made:
(par, subs_made) = re.subn(r"(:http:.*)(\[.*\])", r"\1", par)
par = re.sub(r"([^:])//", r"\1/", par)
# transform references to api endpoints doc into valid rst links
par = re.sub(":http:get:`([^,`]*)`", r"`\1 <\1doc/>`_", par)
# transform references to some elements into bold text
par = re.sub(":http:header:`(.*)`", r"**\1**", par)
par = re.sub(":func:`(.*)`", r"**\1**", par)
return par
def visit_field_list(self, node):
"""
Visit parsed rst field lists to extract relevant info
regarding api endpoint.
"""
self.field_list_visited = True
for child in node.traverse():
# get the parsed field name
if isinstance(child, docutils.nodes.field_name):
field_name = child.astext()
# parse field text
elif isinstance(child, docutils.nodes.paragraph):
text = self.process_paragraph(str(child))
field_data = field_name.split(" ")
# Parameters
if field_data[0] in self.parameter_roles:
if field_data[2] not in self.args_set:
self.data["args"].append(
{"name": field_data[2], "type": field_data[1], "doc": text}
)
self.args_set.add(field_data[2])
# Query Parameters
if field_data[0] in self.query_parameter_roles:
if field_data[2] not in self.params_set:
self.data["params"].append(
{"name": field_data[2], "type": field_data[1], "doc": text}
)
self.params_set.add(field_data[2])
# Request data type
if (
field_data[0] in self.request_json_array_roles
or field_data[0] in self.request_json_object_roles
):
# array
if field_data[0] in self.request_json_array_roles:
self.data["input_type"] = "array"
# object
else:
self.data["input_type"] = "object"
# input object field
if field_data[2] not in self.inputs_set:
self.data["inputs"].append(
{"name": field_data[2], "type": field_data[1], "doc": text}
)
self.inputs_set.add(field_data[2])
self.current_json_obj = self.data["inputs"][-1]
# Response type
if (
field_data[0] in self.response_json_array_roles
or field_data[0] in self.response_json_object_roles
):
# array
if field_data[0] in self.response_json_array_roles:
self.data["return_type"] = "array"
# object
else:
self.data["return_type"] = "object"
# returned object field
if field_data[2] not in self.returns_set:
self.data["returns"].append(
{"name": field_data[2], "type": field_data[1], "doc": text}
)
self.returns_set.add(field_data[2])
self.current_json_obj = self.data["returns"][-1]
# Status Codes
if field_data[0] in self.status_code_roles:
if field_data[1] not in self.status_codes_set:
self.data["status_codes"].append(
{"code": field_data[1], "doc": text}
)
self.status_codes_set.add(field_data[1])
# Request Headers
if field_data[0] in self.request_header_roles:
if field_data[1] not in self.reqheaders_set:
self.data["reqheaders"].append(
{"name": field_data[1], "doc": text}
)
self.reqheaders_set.add(field_data[1])
# Response Headers
if field_data[0] in self.response_header_roles:
if field_data[1] not in self.resheaders_set:
resheader = {"name": field_data[1], "doc": text}
self.data["resheaders"].append(resheader)
self.resheaders_set.add(field_data[1])
if (
resheader["name"] == "Content-Type"
and resheader["doc"] == "application/octet-stream"
):
self.data["return_type"] = "octet stream"
def visit_paragraph(self, node):
"""
Visit relevant paragraphs to parse
"""
# only parsed top level paragraphs
if isinstance(node.parent, docutils.nodes.block_quote):
text = self.process_paragraph(str(node))
# endpoint description
if not text.startswith("**") and text not in self.data["description"]:
self.data["description"] += "\n\n" if self.data["description"] else ""
self.data["description"] += text
def visit_literal_block(self, node):
"""
Visit literal blocks
"""
text = node.astext()
# literal block in endpoint description
if not self.field_list_visited:
self.data["description"] += ":\n\n%s\n" % textwrap.indent(text, "\t")
# extract example urls
if ":swh_web_api:" in text:
examples_str = re.sub(".*`(.+)`.*", r"/api/1/\1", text)
self.data["examples"] += examples_str.split("\n")
def visit_bullet_list(self, node):
# bullet list in endpoint description
if not self.field_list_visited:
self.data["description"] += "\n\n"
for child in node.traverse():
# process list item
if isinstance(child, docutils.nodes.paragraph):
line_text = self.process_paragraph(str(child))
self.data["description"] += "\t* %s\n" % line_text
elif self.current_json_obj:
self.current_json_obj["doc"] += "\n\n"
for child in node.traverse():
# process list item
if isinstance(child, docutils.nodes.paragraph):
line_text = self.process_paragraph(str(child))
self.current_json_obj["doc"] += "\t\t* %s\n" % line_text
self.current_json_obj = None
def visit_warning(self, node):
text = self.process_paragraph(str(node))
rst_warning = "\n\n.. warning::\n%s\n" % textwrap.indent(text, "\t")
if rst_warning not in self.data["description"]:
self.data["description"] += rst_warning
def unknown_visit(self, node):
pass
def unknown_departure(self, node):
pass
def _parse_httpdomain_doc(doc, data):
doc_lines = doc.split("\n")
doc_lines_filtered = []
urls = defaultdict(list)
default_http_methods = ["HEAD", "OPTIONS"]
# httpdomain is a sphinx extension that is unknown to docutils but
# fortunately we can still parse its directives' content,
# so remove lines with httpdomain directives before executing the
# rst parser from docutils
for doc_line in doc_lines:
if ".. http" not in doc_line:
doc_lines_filtered.append(doc_line)
else:
url = doc_line[doc_line.find("/") :]
# emphasize url arguments for html rendering
url = re.sub(r"\((\w+)\)", r" **\(\1\)** ", url)
method = re.search(r"http:(\w+)::", doc_line).group(1)
urls[url].append(method.upper())
for url, methods in urls.items():
data["urls"].append({"rule": url, "methods": methods + default_http_methods})
# parse the rst docstring and do not print system messages about
# unknown httpdomain roles
document = parse_rst("\n".join(doc_lines_filtered), report_level=5)
# remove the system_message nodes from the parsed document
for node in document.traverse(docutils.nodes.system_message):
node.parent.remove(node)
# visit the document nodes to extract relevant endpoint info
visitor = _HTTPDomainDocVisitor(document, data)
document.walkabout(visitor)
class APIDocException(Exception):
"""
Custom exception to signal errors in the use of the APIDoc decorators
"""
def api_doc(
route: str, noargs: bool = False, tags: List[str] = [], api_version: str = "1",
):
"""
Decorator for an API endpoint implementation used to generate a dedicated
view displaying its HTML documentation.
The documentation will be generated from the endpoint docstring based on
sphinxcontrib-httpdomain format.
Args:
route: documentation page's route
noargs: set to True if the route has no arguments, and its
result should be displayed anytime its documentation
is requested. Default to False
tags: Further information on api endpoints. Two values are
possibly expected:
* hidden: remove the entry points from the listing
* upcoming: display the entry point but it is not followable
api_version: api version string
"""
tags_set = set(tags)
# @api_doc() Decorator call
def decorator(f):
# if the route is not hidden, add it to the index
if "hidden" not in tags_set:
doc_data = get_doc_data(f, route, noargs)
doc_desc = doc_data["description"]
first_dot_pos = doc_desc.find(".")
APIUrls.add_doc_route(
route,
doc_desc[: first_dot_pos + 1],
noargs=noargs,
api_version=api_version,
tags=tags_set,
)
# create a dedicated view to display endpoint HTML doc
@api_view(["GET", "HEAD"])
@wraps(f)
def doc_view(request):
doc_data = get_doc_data(f, route, noargs)
return make_api_response(request, None, doc_data)
route_name = "%s-doc" % route[1:-1].replace("/", "-")
urlpattern = f"^{api_version}{route}doc/$"
view_name = "api-%s-%s" % (api_version, route_name)
APIUrls.add_url_pattern(urlpattern, doc_view, view_name)
@wraps(f)
def documented_view(request, **kwargs):
doc_data = get_doc_data(f, route, noargs)
try:
return {"data": f(request, **kwargs), "doc_data": doc_data}
except Exception as exc:
exc.doc_data = doc_data
raise exc
return documented_view
return decorator
@functools.lru_cache(maxsize=32)
def get_doc_data(f, route, noargs):
"""
Build documentation data for the decorated api endpoint function
"""
data = {
"description": "",
"response_data": None,
"urls": [],
"args": [],
"params": [],
"input_type": "",
"inputs": [],
"resheaders": [],
"reqheaders": [],
"return_type": "",
"returns": [],
"status_codes": [],
"examples": [],
"route": route,
"noargs": noargs,
}
if not f.__doc__:
raise APIDocException(
"apidoc: expected a docstring" " for function %s" % (f.__name__,)
)
# use raw docstring as endpoint documentation if sphinx
# httpdomain is not used
if ".. http" not in f.__doc__:
data["description"] = f.__doc__
# else parse the sphinx httpdomain docstring with docutils
# (except when building the swh-web documentation through autodoc
# sphinx extension, not needed and raise errors with sphinx >= 1.7)
elif "SWH_DOC_BUILD" not in os.environ:
_parse_httpdomain_doc(f.__doc__, data)
# process input/returned object info for nicer html display
inputs_list = ""
returns_list = ""
for inp in data["inputs"]:
# special case for array of non object type, for instance
# :<jsonarr string -: an array of string
if inp["name"] != "-":
inputs_list += "\t* **%s (%s)**: %s\n" % (
inp["name"],
inp["type"],
inp["doc"],
)
for ret in data["returns"]:
# special case for array of non object type, for instance
# :>jsonarr string -: an array of string
if ret["name"] != "-":
returns_list += "\t* **%s (%s)**: %s\n" % (
ret["name"],
ret["type"],
ret["doc"],
)
data["inputs_list"] = inputs_list
data["returns_list"] = returns_list
return data
DOC_COMMON_HEADERS = """
:reqheader Accept: the requested response content type,
either ``application/json`` (default) or ``application/yaml``
:resheader Content-Type: this depends on :http:header:`Accept`
header of request"""
DOC_RESHEADER_LINK = """
:resheader Link: indicates that a subsequent result page is
available and contains the url pointing to it
"""
DEFAULT_SUBSTITUTIONS = {
"common_headers": DOC_COMMON_HEADERS,
"resheader_link": DOC_RESHEADER_LINK,
}
def format_docstring(**substitutions):
def decorator(f):
f.__doc__ = f.__doc__.format(**{**DEFAULT_SUBSTITUTIONS, **substitutions})
return f
return decorator

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