(SR NO - 7) Added FastAPI Backend for GitHub Repository Stats Fetching with Modular Structure and CORS Support

backend/README.md

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+# Setting Up the .env File for FastAPI
+
+This guide provides step-by-step instructions to configure your `.env` file and securely use a GitHub Personal Access Token in your FastAPI project.
+
+## 1. Create the `.env` File
+
+1. Navigate to the `backend` directory where your project is set up.
+2. Create a new file named `.env` (if it doesn’t already exist).
+
+## 2. Add the GitHub Access Token
+
+1. Open the `.env` file and add the following line:
+
+   ```text
+   GITHUB_TOKEN=your_personal_access_token_here
+   ```
+
+2. Replace `your_personal_access_token_here` with your actual GitHub Personal Access Token.
+
+## 3. Generate a GitHub Personal Access Token
+
+1. Go to [GitHub Developer Settings](https://github.com/settings/tokens).
+2. Click on  **Tokens (classic)** and then **Generate new token** and then generate the classic token.
+3. Select the required scopes for your application:
+   - **For public repositories**: Check `repo`.
+   - **For additional access**: Check `read:org`, `read:user`, etc., as needed.
+4. Copy the generated token (it will only be displayed once).
+
+
+## 5. Load Environment Variables in FastAPI
+
+Ensure you have these things installed in your project:
+
+```bash
+pip install python-dotenv requests fastapi uvicorn
+
+```
+
+### Test API Requests
+Run your FastAPI server:
+
+```bash
+uvicorn backend.main:app --reload
+```
+
+Use `curl` or **Postman** to test the `/api/repo-stats` endpoint:
+
+```bash
+curl -X POST http://localhost:8000/api/repo-stats \
+     -H "Content-Type: application/json" \
+     -d '{"repo_url": "https://github.com/AOSSIE-Org/Devr.AI/"}'
+```
+
+If all the things correctly got setup then you will see the JSON repsponse
+
+---
+
+
+Now, your FastAPI application is securely set up to use GitHub API credentials from a `.env` file!

backend/app/models.py

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+from pydantic import BaseModel
+
+class RepoRequest(BaseModel):
+    repo_url: str

backend/app/routes.py

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+from fastapi import APIRouter, HTTPException
+from app.models import RepoRequest
+from app.utils.github_api import get_repo_stats
+
+router = APIRouter()
+
+@router.post("/repo-stats")
+async def repo_stats_endpoint(repo: RepoRequest):
+    try:
+        return await get_repo_stats(repo.repo_url)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))

backend/app/utils/github_api.py

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+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+import requests
+import os
+from urllib.parse import urlparse
+from dotenv import load_dotenv
+
+load_dotenv()  # Load environment variables
+
+app = FastAPI()
+
+class RepoRequest(BaseModel):
+    repo_url: str
+
+def parse_github_url(url: str) -> tuple:
+    """Extract owner/repo from GitHub URL"""
+    parsed = urlparse(url)
+    path = parsed.path.strip('/').split('/')
+    if len(path) < 2:
+        raise ValueError("Invalid GitHub URL")
+    return path[0], path[1]
+
+def github_api_request(endpoint: str) -> dict:
+    """Make authenticated GitHub API request"""
+    headers = {
+        "Authorization": f"token {os.getenv('GITHUB_TOKEN')}",
+        "Accept": "application/vnd.github.v3+json"
+    }
+    response = requests.get(f"https://api.github.com{endpoint}", headers=headers)
+    response.raise_for_status()
+    return response.json()
+
+
+@app.post("/repo-stats")
+async def get_repo_stats(repo_url: str):
+    try:
+        owner, repo_name = parse_github_url(repo_url)
+        # Rest of your function...
+        # Get basic repo info
+        repo_info = github_api_request(f"/repos/{owner}/{repo_name}")
+
+        # Get contributors
+        contributors = github_api_request(f"/repos/{owner}/{repo_name}/contributors")
+
+        # Get pull requests
+        prs = github_api_request(f"/repos/{owner}/{repo_name}/pulls?state=all")
+
+        # Get issues
+        issues = github_api_request(f"/repos/{owner}/{repo_name}/issues?state=all")
+
+        community_profile = github_api_request(f"/repos/{owner}/{repo_name}/community/profile")
+
+        # Recent commits (last 5)
+        commits = github_api_request(f"/repos/{owner}/{repo_name}/commits?per_page=5")
+
+        code_frequency = github_api_request(f"/repos/{owner}/{repo_name}/stats/code_frequency")
+
+        return {
+            "name": repo_info["full_name"],
+            "stars": repo_info["stargazers_count"],
+            "forks": repo_info["forks_count"],
+            "watchers": repo_info["subscribers_count"],
+            "created_at": repo_info["created_at"],
+            "updated_at": repo_info["updated_at"],
+             # Licensing and topics
+            # "license": repo_info.get("license", {}).get("spdx_id", "No License"),
+
+            "topics": repo_info.get("topics", []),
+
+            "contributors": [{
+                "login": c["login"],
+                "contributions": c["contributions"],
+                "avatar_url": c["avatar_url"]
+            } for c in contributors],
+            "recent_commits": [{
+                "sha": commit["sha"][:7],
+                "author": commit["commit"]["author"]["name"],
+                "message": commit["commit"]["message"],
+                "date": commit["commit"]["author"]["date"]
+            } for commit in commits],
+
+
+            "community": {
+                "health_percentage": community_profile["health_percentage"],
+                "code_of_conduct": community_profile.get("files", {}).get("code_of_conduct") is not None,
+                "license": community_profile.get("files", {}).get("license") is not None,
+                "readme": community_profile.get("files", {}).get("readme") is not None
+            },
+             # Issues
+            "issues": {
+                "total": len(issues),
+                "open": sum(1 for issue in issues if issue["state"] == "open"),
+                "closed": sum(1 for issue in issues if issue["state"] == "closed"),
+                "labels": list({label["name"] for issue in issues for label in issue["labels"]})
+            },
+
+             # Code statistics
+            "code_activity": {
+                "weekly_commits": len(code_frequency) if isinstance(code_frequency, list) else 0,
+                "total_additions": sum(week[1] for week in code_frequency) if isinstance(code_frequency, list) else 0,
+                "total_deletions": sum(abs(week[2]) for week in code_frequency) if isinstance(code_frequency, list) else 0
+            },
+
+             # Pull Requests
+            "pull_requests": {
+                "total": len(prs),
+                "merged": sum(1 for pr in prs if pr["merged_at"]),
+                "draft": sum(1 for pr in prs if pr["draft"]),
+                "by_state": {
+                    "open": sum(1 for pr in prs if pr["state"] == "open"),
+                    "closed": sum(1 for pr in prs if pr["state"] == "closed")
+                }
+            },
+        }
+
+    except requests.HTTPError as e:
+        raise HTTPException(status_code=e.response.status_code, 
+                          detail="GitHub API error")
+    except ValueError:
+        raise HTTPException(status_code=400, 
+                          detail="Invalid GitHub URL format")

backend/main.py

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 from fastapi import FastAPI
-from routes import router
+from fastapi.middleware.cors import CORSMiddleware
+from app.routes import router  
 import uvicorn
 
 app = FastAPI()
-# Include GitHub webhook routes
-app.include_router(router)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173", "http://127.0.0.1:5173"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+    expose_headers=["*"],  
+)
+
+
+app.include_router(router, prefix="/api")  
 
 if __name__ == "__main__":
     uvicorn.run(app, host="127.0.0.1", port=8000)