config file, smtp, complete user management and more

[JulianFP]

This pull request got quiet large, I will try to separate stuff better in the future. Anyway, this is whats new:

• loads yaml config into app.config at startup (defined in config.py). Includes:
  • ability to load variables from environmental variables instead (implemented in yaml parser, I used pyaml_env for this). What variables are loaded from env has to be defined in config
  • search at different paths following xdg standard (on Linux, code should be OS independent though): user config path -> system config path -> same path as config.py file -> working directory
  • ability to add custom path to load config from (will be added to path hierarchy above before 'user config path')
  • validation of config using jsonschema (includes required options and regex expressions for strings)
  • ability to disable 'required' check of jsonschema for development and testing purposes (maybe you don't want to define a smtp server in your config for development, and you don't care that signup and password reset won't work)
  • insertion of default values for non required options if they are not present in config file
  • nice error messages to help with typos etc.
• add email activation via smtp server
  • smtp server credentials are defined in yaml config
  • token generation is defined in utils.py
  • requires clientURL from yaml config to include a clickable link in the email. This link should not lead to an api url but to a nice UI from a client
  • user has to activate account over activate route for every new email
  • is done at signup and changeUserEmail
• add password reset
  • users can request password reset email (uses same smtp server, token and clientURL stuff as email activation)
  • users can reset their password to a new one over resetPassword route
• check new emails for validity
  • simple regex that checks if string looks like email
  • if 'allowedEmailDomains' in yaml config is not empty, then this regex will deny emails that are not from these domains
  • is done at signup and changeUserEmail
• check new passwords for validity
  • simple regex that checks if password withholds to certain standards
  • password has to include at least one: lower case letter, higher case letter, number, special character
  • password has to have at least 12 characters in total
  • is done at signup, changeUserPassword and passwordReset
• move databasePath, JWT Token Expiration and JWT secret key to yaml config
• ability to disable signup for new accounts over 'disableSignup' in yaml config
• lots of tests improvements
  • adjust client fixture in conftest.py for new yaml config
  • add indirect parametrize to client fixture to get different configs for different test cases with the same fixture
  • currently you can define values of 'allowedEmailDomains' and 'disableSignup'
  • parametrize can also be used to reuse code and write tests of same scheme more elegantly (e.g. invalidPassword, invalidEmail tests)
  • add new fixture to mock smtp code
  • restructure tests
  • adjust all affected test for new behavior of functions
  • add tests for all new api functions

This required the following new dependencies (added to pyproject.toml):

• platformdirs (for getting OS independent and xdg conformant paths easily)
• pyaml_env (yaml parser with ability to also read variables from env vars)
• jsonschema (for schema validation of yaml config)
• (optional) tests: pytest-mock (a convenient wrapper for unittest.mock library of python to be used as a pytest fixture)

related todos (later):

• [ ] tests for model.py, utils.py, config.py
• [ ] documentation of api and yaml config usage

@MarkusEverling Since these are quite large changes, could you please review this PR?

[Sp00ph]

Oh woops wrong account lmao

[MarkusEverling]

Just to confirm, that other account is also me, just not my uni account :sweat_smile:

[codecov-commenter]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (972b0bb) 97.06% compared to head (abd7ec5) 96.92%.

Files	Patch %	Lines
project_W/config.py	69.56%	14 Missing :warning:
project_W/app.py	95.08%	3 Missing :warning:
project_W/model.py	96.93%	3 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3 +/- ## ========================================== - Coverage 97.06% 96.92% -0.14% ========================================== Files 8 10 +2 Lines 375 814 +439 ========================================== + Hits 364 789 +425 - Misses 11 25 +14 ```

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