Add support for wasm32-pyodide

[alarmfox]

Summary

I was trying to use this library in Pyodide WASM runtime but it was not supported.

I added the required packages according to their guidelines. There are issues in Threading so I added a check for parallelism != 1 based on the platform.machine().

Pyodide patch

diff --git a/packages/argon2-cffi-bindings/meta.yaml b/packages/argon2-cffi-bindings/meta.yaml
new file mode 100644
index 00000000..45d4e75f
--- /dev/null
+++ b/packages/argon2-cffi-bindings/meta.yaml
@@ -0,0 +1,21 @@
+package:
+  name: argon2-cffi-bindings
+  version: 21.2.0
+  top-level:
+    - _argon2_cffi_bindings
+source:
+  url: https://files.pythonhosted.org/packages/b9/e9/184b8ccce6683b0aa2fbb7ba5683ea4b9c5763f1356347f1312c32e3c66e/argon2-cffi-bindings-21.2.0.tar.gz
+  sha256: bb89ceffa6c791807d1305ceb77dbfacc5aa499891d2c55661c6459651fc39e3
+about:
+  home: https://github.com/hynek/argon2-cffi-bindings
+  PyPI: https://pypi.org/project/argon2-cffi-bindings
+  summary: Low-level CFFI bindings for Argon2
+  license: MIT
+extra:
+  recipe-maintainers:
+    - alarmfox
+requirements:
+  run:
+    - cffi
+build:
+  cflags: -msimd128
diff --git a/packages/argon2-cffi/meta.yaml b/packages/argon2-cffi/meta.yaml
new file mode 100644
index 00000000..e4e8f760
--- /dev/null
+++ b/packages/argon2-cffi/meta.yaml
@@ -0,0 +1,19 @@
+package:
+  name: argon2-cffi
+  version: 23.1.0
+  top-level:
+    - argon2
+source:
+  url: https://files.pythonhosted.org/packages/a4/6a/e8a041599e78b6b3752da48000b14c8d1e8a04ded09c88c714ba047f34f5/argon2_cffi-23.1.0-py3-none-any.whl
+  sha256: c670642b78ba29641818ab2e68bd4e6a78ba53b7eff7b4c3815ae16abf91c7ea
+about:
+  home: ""
+  PyPI: https://pypi.org/project/argon2-cffi
+  summary: Argon2 for Python
+  license: ""
+extra:
+  recipe-maintainers:
+    - alarmfox
+requirements:
+  run:
+    - cffi
diff --git a/packages/argon2-cffi/test_argon2-cffi.py b/packages/argon2-cffi/test_argon2-cffi.py
new file mode 100644
index 00000000..c914cda8
--- /dev/null
+++ b/packages/argon2-cffi/test_argon2-cffi.py
@@ -0,0 +1,9 @@
+from pytest_pyodide import run_in_pyodide
+
+@run_in_pyodide(packages=["argon2-cffi"])
+def test_argon2_cffi():
+    import argon2
+    ph = argon2.PasswordHasher(parallelism=1)
+    hash = ph.hash("test")
+
+    assert ph.verify(hash, "test") == True

Alternative solution

Pyodide supports patching: instead of providing wheel one could provide the source code and this patch, but there will need to build everything from scratch.

Can we work this out?

[hynek]

hi sorry for the late reaction.

I think I instead of checking for was and polluting the class, I would prefer to have a validate_params_for_platform(params: Parameters) -> None that raises the error.

This can be made efficient by having the sys.platform check at module level and defining different functions. For non-wasm it would be a return None. You can also set DEFAULT_PARALLELISM in the same block