Add hash implementation and basic html parsing. The cli app should be usable.

.gitignore

@@ -127,3 +127,6 @@ dmypy.json
 
 # Pyre type checker
 .pyre/
+
+# Editors
+.vscode/

README.rst

@@ -0,0 +1,27 @@
+Inlinehashes
+============
+
+TODO
+
+Installation
+------------
+
+TODO
+
+Usage
+-----
+
+CLI app
+.......
+
+TODO
+
+Library
+.......
+
+TODO
+
+Contributions
+-------------
+
+All contributions and improvements are welcome.

inlinehashes/__init__.py

@@ -1 +1,4 @@
-__version__ = '0.1.0'
+from .lib import parse
+
+__version__ = "0.0.1"
+__all__ = ["parse"]

inlinehashes/app.py

@@ -0,0 +1,69 @@
+"""CLI App.
+
+This file contains all the logic for the command line interface of
+this library. It makes use of the same tools available for those that
+install the package in order to be used programatically.
+"""
+from typing import List
+import requests
+import argparse
+import inlinehashes
+import json
+
+
+def build_output(
+    inlines: List[inlinehashes.lib.Inline], alg: str, full: bool = False
+) -> str:
+    """Build a JSON output from a list of Inline objects."""
+    snippet = "content" if full else "short_content"
+    out = [{"content": getattr(i, snippet), "hash": getattr(i, alg)} for i in inlines]
+    return json.dumps(out, indent=2)
+
+
+def write_to_file(path: str, content: str) -> None:
+    """Writes the content to the specified file.
+
+    raises:
+        OSError: More than one subclass of OSError
+    """
+    with open(path, "w") as f:
+        f.write(content)
+
+
+def run_cli() -> None:
+    """Entry point of the command line interface."""
+    parser = argparse.ArgumentParser()
+    parser.add_argument("source", help="URL or local HTML file to check")
+    parser.add_argument(
+        "-a", "--alg", help="Hash algorithm to use (default: sha256)", default="sha256"
+    )
+    parser.add_argument(
+        "-f", "--full", help="Include full content in the output", action="store_true"
+    )
+    parser.add_argument("-o", "--output", help="Store output in a file.")
+    args = parser.parse_args()
+    path = args.source
+
+    try:
+        if path.startswith("http://") or path.startswith("https://"):
+            response = requests.get(path)
+            response.raise_for_status()
+            content = response.text
+        else:
+            with open(path, "r") as f:
+                content = f.read()
+    except (requests.RequestException, OSError):
+        print(f"Invalid source: {path}")
+        exit(1)
+
+    inlines = inlinehashes.parse(content)
+    out = build_output(inlines, args.alg, bool(args.full))
+
+    if args.output:
+        write_to_file(args.output, out)
+    else:
+        print(out)
+
+
+if __name__ == "__main__":
+    run_cli()

inlinehashes/lib.py

@@ -0,0 +1,74 @@
+"""Inline Hashes - Helping with CSP when possible.
+
+This small module helps you to parse HTML documents and extract all the inline
+content that must be specifically allowed in the Content-Security-Policy in
+order to work (assuming "unsafe-inline" is not present).
+"""
+from typing import List
+from dataclasses import dataclass
+from functools import cached_property
+from itertools import chain
+import hashlib
+import base64
+
+from bs4 import BeautifulSoup
+
+_VALID_TARGETS = {
+    "scripts": [
+        {"name": "script"},
+    ],
+    "styles": [
+        {"name": "style"},
+    ],
+}
+
+
+@dataclass(frozen=True)
+class Inline:
+    """Represents a piece of content present in the HTML document.
+
+    It can be the value of an element/node or the value of an attribute
+    of a given element/node.
+    """
+
+    content: str
+
+    @cached_property
+    def short_content(self) -> str:
+        return self.content[:50]
+
+    @cached_property
+    def sha256(self) -> str:
+        h = hashlib.sha256(self.content.encode("utf-8"))
+        h_b64 = base64.b64encode(h.digest()).decode("utf8")
+        return f"sha256-{h_b64}"
+
+    @cached_property
+    def sha384(self) -> str:
+        h = hashlib.sha384(self.content.encode("utf-8"))
+        h_b64 = base64.b64encode(h.digest()).decode("utf8")
+        return f"sha384-{h_b64}"
+
+    @cached_property
+    def sha512(self) -> str:
+        h = hashlib.sha512(self.content.encode("utf-8"))
+        h_b64 = base64.b64encode(h.digest()).decode("utf8")
+        return f"sha512-{h_b64}"
+
+
+def parse(content: str, target: str = "all") -> List[Inline]:
+    """Parses an HTML document and extracts."""
+    soup = BeautifulSoup(content, "html.parser")
+
+    if target == "all":
+        search_queries = chain(*_VALID_TARGETS.values())
+    elif target in _VALID_TARGETS.keys():
+        search_queries = _VALID_TARGETS[target]
+    else:
+        raise ValueError("Invalid Target")
+
+    elements = []
+    for q in search_queries:
+        elements += soup.find_all(**q)
+
+    return [Inline(e.contents[0]) for e in elements if e.contents]

poetry.lock

@@ -0,0 +1,433 @@
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+    {file = "urllib3-1.26.8.tar.gz", hash = "sha256:0e7c33d9a63e7ddfcb86780aac87befc2fbddf46c58dbb487e0855f7ceec283c"},
+]
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+    {file = "wcwidth-0.2.5-py2.py3-none-any.whl", hash = "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784"},
+    {file = "wcwidth-0.2.5.tar.gz", hash = "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"},
+]

pyproject.toml

@@ -1,14 +1,35 @@
 [tool.poetry]
 name = "inlinehashes"
-version = "0.1.0"
-description = ""
+version = "0.0.1"
+description = "Hash generator for HTML inline styles and scripts"
 authors = ["Gonçalo Valério <gon@ovalerio.net>"]
+homepage = "https://github.com/dethos/inlinehashes"
+repository = "https://github.com/dethos/inlinehashes"
+license = "MIT"
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Topic :: Security",
+    "Topic :: Text Processing :: Markup :: HTML",
+    "Typing :: Typed"
+]
 
 [tool.poetry.dependencies]
 python = "^3.9"
+beautifulsoup4 = "^4.10.0"
+requests = "^2.27.1"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.2"
+black = "^22.1.0"
+mypy = "^0.940"
+
+[tool.poetry.scripts]
+cli = "inlinehashes.app:run_cli"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]

tests/test_cli_app.py

@@ -0,0 +1 @@
+# Add later

tests/test_inlinehashes.py

@@ -1,5 +1,126 @@
+import pytest
+
+
 from inlinehashes import __version__
+from inlinehashes.lib import Inline
+
+
+class TestInline:
+    def test_cant_be_changed(self):
+        pass
+
+    @pytest.mark.parametrize(
+        "content,short_version",
+        (
+            ("", ""),
+            ("var a = 1", "var a = 1"),
+            ("a" * 60, "a" * 50),
+            ("a " * 100, "a " * 25),
+        ),
+    )
+    def test_short_content_property(self, content, short_version):
+        inline = Inline(content=content)
+        assert inline.short_content == short_version
+
+    @pytest.mark.parametrize(
+        "content,hash",
+        (
+            (
+                "// some random text just for the test",
+                "sha256-vzu2ZpqtqjZiOP3l+j6HQsHp+riIi8i0xVa6on8mlRo=",
+            ),
+            (
+                "var someVar = { name: 'some object' };",
+                "sha256-v/WJgrg+M5LxuU0IK/Y1dT3tksK9AiJzm1dKDBVW+iw=",
+            ),
+            (
+                "color:blue;font-size:46px;",
+                "sha256-DFhv4zzzY7i3fh6qPPRuAiglNEX0GP7ZxllkMYPUF90=",
+            ),
+            ("var i = 1;", "sha256-1QhCpB/IFWw8Pb/g/IBzIBgErHWG5wrytauZib+UF+g="),
+            (" var i = 1; ", "sha256-JXsq/1KEtrnrlGozP1V228Z4rNL2pB7MlgpEBBbVnLA="),
+        ),
+    )
+    def test_sha256_property(self, content, hash):
+        inline = Inline(content=content)
+        assert inline.sha256 == hash
+
+    @pytest.mark.parametrize(
+        "content,hash",
+        (
+            (
+                "// some random text just for the test",
+                "sha384-A5EAhuefnNnRpbU0i6b6GBGk/fhBeEbvVVnYrzVFcbxgiuNmk5K59nFbJQZiagi2",
+            ),
+            (
+                "var someVar = { name: 'some object' };",
+                "sha384-tml8/Wx/TZ8FTfazxR54HN61zqUyzX4KuiBPxa/ot0X/oyEC19LmI+BqaeiDrzcE",
+            ),
+            (
+                "color:blue;font-size:46px;",
+                "sha384-BLIqhqw5pbfWaCOlp8/xES7A5UVD7u8imzLvpHJ1sJW2gsIWoj+rLoPKH2OBMZUi",
+            ),
+            (
+                "var i = 1;",
+                "sha384-exw+zZA219Su/XnwiE7j7V4yLVNpXk08+H71sGIABcOj8Nq+OiXLWOkPTUajb3tv",
+            ),
+            (
+                " var i = 1; ",
+                "sha384-nZsnOT4KuSVu0hzbDrLEc3Qvy3ATghmXDEZ9Mof5QDMEsu40TtlH3KSMqTCNHNyu",
+            ),
+        ),
+    )
+    def test_sha384_property(self, content, hash):
+        inline = Inline(content=content)
+        assert inline.sha384 == hash
+
+    @pytest.mark.parametrize(
+        "content,hash",
+        (
+            (
+                "// some random text just for the test",
+                "sha512-8Ig5oR6kSaFkAeZ2DQXCxTb9Q0E4roYZfFBaHhXZaB1xOTdFphjm72MkfDLp7SMoDGSIYBbXxtve5s2nXLhhtA==",
+            ),
+            (
+                "var someVar = { name: 'some object' };",
+                "sha512-We1wStKIQ/9t0u/jKh5rNlYMMYlQtPrp5yfe7FQRqCkClsLKfRSDWfQ+eFKvJk/ciSIWdph3+dJ6sobCct9l2Q==",
+            ),
+            (
+                "color:blue;font-size:46px;",
+                "sha512-D79kfJyq3IsfBLSk/JJmZtIHI1NnOyP2EnYG8DUjsfTQZLVgKXJd3oUXy0lsIskqUAdQ1XxS2nNtwBa7eYg+pA==",
+            ),
+            (
+                "var i = 1;",
+                "sha512-9jfUbPKIo4icp7gZFa9Wvl3S9ofp2zdzxqqvOL1oLSV49b3I6MkVtyjM1ydPefCjLreZBlKa+iZwF1DLhUdgSQ==",
+            ),
+            (
+                " var i = 1; ",
+                "sha512-KG0P+4FVrx4nU8/XARtZiktTanUC8ENoTN4/oyQG/O9n9NpdHiVIVpW8JWwrixq/7u9OWtDog6BJAcG199eqFA==",
+            ),
+        ),
+    )
+    def test_sha512_property(self, content, hash):
+        inline = Inline(content=content)
+        assert inline.sha512 == hash
+
+
+class TestParse:
+    @pytest.mark.skip(reason="Add later")
+    def test_parse_detects_script_tags(self):
+        pass
+
+    @pytest.mark.skip(reason="Add later")
+    def test_parse_detects_style_tags(self):
+        pass
+
+    @pytest.mark.skip(reason="Not Implemented yet")
+    def test_parse_detects_style_attributes(self):
+        pass
+
+    @pytest.mark.skip(reason="Not Implemented yet")
+    def test_parse_detect_attributes_with_js(self):
+        pass
 
 
 def test_version():
-    assert __version__ == '0.1.0'
+    assert __version__ == "0.0.1"