lab1

app_python/.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/

app_python/PYTHON.md

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+# Framework
+
+FastAPI was chosen for this lab.
+
+It has very high performance as it is based on Starlette and Pydantic.
+
+FastAPI takes advantage of standard Python type declarations in function parameters to declare request parameters and
+bodies, perform data conversion (serialization, parsing), data validation, and automatic API documentation with OpenAPI
+3 (including JSON Schema).
+
+It includes tools and utilities for security and authentication (including OAuth2 with JWT tokens), a dependency
+injection system, automatic generation of interactive API documentation, and other features.
+
+## Best practices
+
+- Separate static file serving routes from api routes
+- The server can accept any timezone, but the client uses only a specified one. It makes the solution extendable, if
+  needed.
+- Validate given timezone and throw **400 Bad Request** with the message to explain the error.

app_python/README.md

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+# Time app
+
+A simple app that displays a time.
+
+Consists of two parts
+
+1. Python API server that uses FastAPI
+2. Frontend client
+
+Server has two endpoints
+
+1. `/` for serving static files under [./static](./static) folder
+2. `/api/time?tz={tz}` route that accepts timezone and returns the time in this timezone in a format
+   of `%Y-%m-%d %H:%M:%S`
+
+Client fetches the time on interval each second.

app_python/app.py

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+from datetime import datetime
+
+import pytz
+from fastapi import FastAPI, HTTPException
+from starlette.staticfiles import StaticFiles
+
+app = FastAPI(title="Main app")
+api = FastAPI(title="Api app")
+
+
+@api.get("/time")
+def get_time(tz: str):
+    if tz not in pytz.all_timezones:
+        raise HTTPException(status_code=400, detail=f"Unknown timezone {tz}")
+
+    return {"time": datetime.now(pytz.timezone(tz)).strftime("%Y-%m-%d %H:%M:%S")}
+
+
+app.mount("/api", api)
+app.mount("/", StaticFiles(directory="static", html=True), name="static")

app_python/requirements.txt

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+typing_extensions~=4.9.0
+sniffio~=1.3.0
+fastapi~=0.109.0
+starlette~=0.35.1
+pydantic~=2.6.0
+pydantic_core~=2.16.1
+anyio~=4.2.0

app_python/static/index.html

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+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"
+          name="viewport">
+    <meta content="ie=edge" http-equiv="X-UA-Compatible">
+    <title>Moscow Time</title>
+</head>
+<body>
+Current time is <span id="time">loading...</span>
+</body>
+<script defer>
+    const timeElement = document.getElementById("time")
+
+    setInterval(() => {
+        fetch('/api/time?' + new URLSearchParams({
+            tz: 'Europe/Moscow',
+        })).then(res => res.json()).then(res => {
+            timeElement.textContent = res.time
+        }).catch(alert)
+    }, 1000)
+</script>
+</html>