feat: time-ui
This commit is contained in:
Timothy Jaeryang Baek
@@ -0,0 +1,208 @@
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from fastapi import FastAPI, HTTPException, Body
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import HTMLResponse, RedirectResponse
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from pydantic import BaseModel, Field
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from datetime import datetime, timezone
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from typing import Literal
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import pytz
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from dateutil import parser as dateutil_parser
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app = FastAPI(
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title="Secure Time Utilities API",
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version="1.0.0",
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description="Provides secure UTC/local time retrieval, formatting, timezone conversion, and comparison.",
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)
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origins = ["*"]
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app.add_middleware(
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CORSMiddleware,
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allow_origins=origins,
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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# -------------------------------
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# Pydantic models
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# -------------------------------
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class FormatTimeInput(BaseModel):
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format: str = Field(
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"%Y-%m-%d %H:%M:%S", description="Python strftime format string"
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)
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timezone: str = Field(
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"UTC", description="IANA timezone name (e.g., UTC, America/New_York)"
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)
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class ConvertTimeInput(BaseModel):
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timestamp: str = Field(
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..., description="ISO 8601 formatted time string (e.g., 2024-01-01T12:00:00Z)"
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)
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from_tz: str = Field(
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..., description="Original IANA time zone of input (e.g. UTC or Europe/Berlin)"
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)
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to_tz: str = Field(..., description="Target IANA time zone to convert to")
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class ElapsedTimeInput(BaseModel):
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start: str = Field(..., description="Start timestamp in ISO 8601 format")
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end: str = Field(..., description="End timestamp in ISO 8601 format")
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units: Literal["seconds", "minutes", "hours", "days"] = Field(
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"seconds", description="Unit for elapsed time"
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)
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class ParseTimestampInput(BaseModel):
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timestamp: str = Field(
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..., description="Flexible input timestamp string (e.g., 2024-06-01 12:00 PM)"
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)
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timezone: str = Field(
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"UTC", description="Assumed timezone if none is specified in input"
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)
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# -------------------------------
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# Helper for pretty HTML
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# -------------------------------
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def html_page(title: str, body: str) -> HTMLResponse:
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html = f"""
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<html>
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<head>
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<title>{title}</title>
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<style>
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body {{
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font-family: Arial, sans-serif;
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margin: 40px;
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background-color: #f7f7f7;
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height: 4rem;
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color: #333;
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}}
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h1 {{
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color: #2c3e50;
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}}
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pre {{
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background: #ecf0f1;
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padding: 10px;
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border-radius: 5px;
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font-size: 1.1em;
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}}
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ul {{
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columns: 3;
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-webkit-columns: 3;
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-moz-columns: 3;
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}}
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li {{
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margin-bottom: 5px;
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}}
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</style>
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</head>
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<body>
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<h1>{title}</h1>
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{body}
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</body>
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</html>
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"""
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return html
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# -------------------------------
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# Routes
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# -------------------------------
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@app.get("/get_current_local_time", summary="Current Local Time")
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def get_current_local():
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local_time = datetime.now().isoformat()
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headers = {"Content-Disposition": "inline"}
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return HTMLResponse(
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content=html_page("Current Local Time", f"<pre>{local_time}</pre>"),
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headers=headers,
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)
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@app.post("/format_time", summary="Format current time")
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def format_current_time(data: FormatTimeInput):
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try:
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tz = pytz.timezone(data.timezone)
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except Exception:
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raise HTTPException(
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status_code=400, detail=f"Invalid timezone: {data.timezone}"
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)
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now = datetime.now(tz)
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try:
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formatted = now.strftime(data.format)
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headers = {"Content-Disposition": "inline"}
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return HTMLResponse(
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content=html_page("Formatted Time", f"<pre>{formatted}</pre>"),
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headers=headers,
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)
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except Exception as e:
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raise HTTPException(status_code=400, detail=f"Invalid format string: {e}")
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@app.post("/convert_time", summary="Convert between timezones")
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def convert_time(data: ConvertTimeInput):
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try:
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from_zone = pytz.timezone(data.from_tz)
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to_zone = pytz.timezone(data.to_tz)
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except Exception as e:
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raise HTTPException(status_code=400, detail=f"Invalid timezone: {e}")
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try:
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dt = dateutil_parser.parse(data.timestamp)
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if dt.tzinfo is None:
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dt = from_zone.localize(dt)
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else:
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dt = dt.astimezone(from_zone)
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converted = dt.astimezone(to_zone).isoformat()
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headers = {"Content-Disposition": "inline"}
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return HTMLResponse(
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content=html_page("Converted Time", f"<pre>{converted}</pre>"),
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headers=headers,
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)
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except Exception as e:
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raise HTTPException(status_code=400, detail=f"Invalid timestamp: {e}")
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@app.post("/parse_timestamp", summary="Parse and normalize timestamps")
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def parse_timestamp(data: ParseTimestampInput):
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try:
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tz = pytz.timezone(data.timezone)
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dt = dateutil_parser.parse(data.timestamp)
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if dt.tzinfo is None:
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dt = tz.localize(dt)
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dt_utc = dt.astimezone(pytz.utc).isoformat()
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headers = {"Content-Disposition": "inline"}
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return HTMLResponse(
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content=html_page("Parsed Timestamp (UTC)", f"<pre>{dt_utc}</pre>"),
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headers=headers,
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)
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except Exception as e:
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raise HTTPException(status_code=400, detail=f"Could not parse: {e}")
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@app.get("/list_time_zones", summary="All valid time zones")
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def list_time_zones():
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tz_list_html = (
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"<ul>" + "".join(f"<li>{tz}</li>" for tz in pytz.all_timezones) + "</ul>"
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)
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headers = {"Content-Disposition": "inline"}
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return HTMLResponse(
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content=html_page("Valid Time Zones", tz_list_html), headers=headers
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)
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@app.get("/go_to_timezones", summary="Redirect to /list_time_zones")
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def redirect_to_timezones():
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"""
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Redirects user to the list of time zones.
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"""
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return RedirectResponse(url="/list_time_zones")
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@app.get("/useful_redirect", summary="Redirect to useful external time resource")
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def useful_redirect():
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"""
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Redirects users to a useful external website (timeanddate.com).
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"""
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headers = {"Content-Disposition": "inline"}
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external_url = "https://time.is"
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return RedirectResponse(url=external_url, headers=headers)
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