feat: add endpoints to shorten url

main.py

@@ -1,9 +1,27 @@
 from fastapi import FastAPI
+from .models import UrlPayload
+from .utils import generate_shortcode
 
 app = FastAPI()
 
-@app.get("/")
-def read_root():
-    return {
-        "Hello": "World"
-    }
+# temporary data store
+url_mapping = {}
+
+@app.get("/{shortcode}")
+async def get_original_url(shortcode: str):
+    if shortcode in url_mapping:
+        return {"original_url": url_mapping[shortcode]}
+    else:
+        raise HTTPException(status_code=404, detail="Shortcode not found")
+
+
+@app.post("/shorten/")
+async def create_short_url(url_payload: UrlPayload):
+    original_url = url_payload.url
+    shortcode = generate_shortcode()
+
+    if shortcode in url_mapping:
+        raise HTTPException(status_code=409, detail="Shortcode already in use")
+
+    url_mapping[shortcode] = str(original_url)
+    return {"shortcode": shortcode, "original_url": original_url}

models.py

@@ -0,0 +1,4 @@
+from pydantic import BaseModel, HttpUrl
+
+class UrlPayload(BaseModel):
+    url: HttpUrl

utils.py

@@ -0,0 +1,6 @@
+import string
+import random
+
+def generate_shortcode(length=6) -> str:
+    characters = string.ascii_letters + string.digits
+    return ''.join(random.choice(characters) for _ in range(length))