Initial commit: Callsign Generator with FastAPI and React

backend/Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

backend/main.py

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+from fastapi import FastAPI, HTTPException
+from fastapi.middleware.cors import CORSMiddleware
+from pydantic import BaseModel
+from typing import List, Dict, Optional
+import httpx
+import os
+import json
+from dotenv import load_dotenv
+
+load_dotenv()
+
+app = FastAPI()
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+OPENROUTER_API_KEY = os.getenv("OPENROUTER_API_KEY")
+MODEL_NAME = "google/gemini-2.0-flash-exp:free"
+
+class Answers(BaseModel):
+    initial_params: Dict[str, str]
+    follow_up_answers: Dict[str, str]
+
+@app.get("/")
+async def root():
+    return {"message": "Callsign Generator API"}
+
+@app.post("/questions")
+async def get_questions(answers: Answers):
+    prompt = f"""
+    Based on the following user preferences for a CB radio callsign:
+    Initial Params: {json.dumps(answers.initial_params)}
+    Previous Answers: {json.dumps(answers.follow_up_answers)}
+    
+    Generate 1-3 relevant and short follow-up questions to help refine the callsign.
+    Return ONLY a JSON object with the format: {{ "questions": [ "question 1", "question 2" ] }}
+    Respond in Swedish.
+    """
+    
+    if not OPENROUTER_API_KEY:
+        return {"questions": ["Config error: OPENROUTER_API_KEY missing"]}
+
+    try:
+        async with httpx.AsyncClient() as client:
+            response = await client.post(
+                "https://openrouter.ai/api/v1/chat/completions",
+                headers={
+                    "Authorization": f"Bearer {OPENROUTER_API_KEY}",
+                    "Content-Type": "application/json",
+                },
+                json={
+                    "model": MODEL_NAME,
+                    "messages": [{"role": "user", "content": prompt}],
+                    "response_format": { "type": "json_object" }
+                },
+                timeout=30.0
+            )
+            result = response.json()
+            if 'choices' not in result:
+                return {"questions": [f"API Error: {result.get('error', 'Unknown error')}"]}
+            content = result['choices'][0]['message']['content']
+            return json.loads(content)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+@app.post("/generate")
+async def generate_callsign(answers: Answers):
+    prompt = f"""
+    Based on the following user preferences for a CB radio callsign:
+    Initial Params: {json.dumps(answers.initial_params)}
+    Previous Answers: {json.dumps(answers.follow_up_answers)}
+    
+    Generate a realistic CB callsign and a short motivation.
+    Return ONLY a JSON object with the format: {{ "callsign": "<string>", "reason": "<string>" }}
+    Respond in Swedish.
+    """
+    
+    if not OPENROUTER_API_KEY:
+        return {"callsign": "ERROR", "reason": "OPENROUTER_API_KEY missing"}
+
+    try:
+        async with httpx.AsyncClient() as client:
+            response = await client.post(
+                "https://openrouter.ai/api/v1/chat/completions",
+                headers={
+                    "Authorization": f"Bearer {OPENROUTER_API_KEY}",
+                    "Content-Type": "application/json",
+                },
+                json={
+                    "model": MODEL_NAME,
+                    "messages": [{"role": "user", "content": prompt}],
+                    "response_format": { "type": "json_object" }
+                },
+                timeout=30.0
+            )
+            result = response.json()
+            if 'choices' not in result:
+                return {"callsign": "ERROR", "reason": f"API Error: {result.get('error', 'Unknown error')}"}
+            content = result['choices'][0]['message']['content']
+            return json.loads(content)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))

backend/requirements.txt

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+fastapi
+uvicorn
+httpx
+pydantic
+python-dotenv