docs: updated README and snap install

Improve CLI network error handling and added Snap badges/install instructions.

Author: DebaA17

README.md

@@ -1,13 +1,15 @@
 
 
 
+<h1 align="center">CVE Scanner CLI</h1>
+
 <div align="center">
-	<img src="https://img.shields.io/github/last-commit/DebaA17/CVE-scanner-cli" height="40">
-	<img src="https://img.shields.io/github/license/DebaA17/CVE-scanner-cli" height="40">
-	<img src="https://img.shields.io/badge/python-3.7%2B-blue.svg" height="40">
-</div>
 
-# CVE Scanner CLI
+[![Snap Store](https://img.shields.io/badge/Snap-Store-82BEA0?logo=snapcraft&logoColor=white)](https://snapcraft.io/cvecli)
+[![CI Build](https://img.shields.io/github/actions/workflow/status/DebaA17/CVE-scanner-cli/snapstore.yml?label=build%20%26%20publish)](https://github.com/DebaA17/CVE-scanner-cli/actions/workflows/snapstore.yml)
+[![License](https://img.shields.io/github/license/DebaA17/CVE-scanner-cli)](https://github.com/DebaA17/CVE-scanner-cli/blob/main/LICENSE)
+
+</div>
 
 A command-line tool to search for CVEs (Common Vulnerabilities and Exposures) using public APIs. Results are displayed with color formatting and details using the rich library.
 
@@ -22,6 +24,12 @@ A command-line tool to search for CVEs (Common Vulnerabilities and Exposures) us
 - requests
 - rich
 
+## Installation (Snap Store)
+
+```bash
+sudo snap install cvecli
+```
+
 ## Installation (Local/Global Usage)
 ```bash
 git clone https://github.com/DebaA17/CVE-scanner-cli.git

cve_search_cli.py

@@ -16,6 +16,15 @@
 BASE_URL = "https://cve.circl.lu/api"
 NVD_BASE_URL = "https://services.nvd.nist.gov/rest/json/cves/2.0"
 
+REQUEST_TIMEOUT = (10, 30)
+session = requests.Session()
+session.headers.update(
+    {
+        "User-Agent": "cvecli (https://github.com/DebaA17/CVE-scanner-cli)",
+        "Accept": "application/json",
+    }
+)
+
 def format_date(date_str):
     if not date_str:
         return "N/A"
@@ -26,9 +35,22 @@ def format_date(date_str):
 
 def search_cve_by_id(cve_id):
     url = f"{BASE_URL}/cve/{cve_id}"
-    resp = requests.get(url)
+    try:
+        resp = session.get(url, timeout=REQUEST_TIMEOUT)
+    except requests.RequestException as exc:
+        console.print(
+            f"[bold red]Network error while fetching CVE data.[/]\n{exc}\n"
+            "[dim]If you installed via Snap, ensure the 'network' plug is connected: "
+            "'snap connections cvecli'.[/]"
+        )
+        return
+
     if resp.status_code == 200:
-        data = resp.json()
+        try:
+            data = resp.json()
+        except ValueError:
+            console.print("[bold red]Error: API returned invalid JSON.[/]")
+            return
         cve_id = data.get('cveMetadata', {}).get('cveId', data.get('id'))
         published = format_date(data.get('cveMetadata', {}).get('datePublished', data.get('Published')))
         modified = format_date(data.get('cveMetadata', {}).get('dateUpdated', data.get('Modified')))
@@ -68,14 +90,31 @@ def search_cve_by_id(cve_id):
             for ref in references:
                 panel_text.append(f"  {ref}\n", style="blue underline")
         console.print(Panel(panel_text, title=f"{cve_id}", expand=False, border_style="red"))
+    elif resp.status_code == 404:
+        console.print(f"[bold red]Error: CVE {cve_id} not found.[/]")
     else:
-        console.print(f"[bold red]Error: CVE {cve_id} not found.")
+        console.print(
+            f"[bold red]Error: Failed to fetch CVE {cve_id} (HTTP {resp.status_code}).[/]"
+        )
 
 def search_cve_by_keyword(keyword):
     params = {"keywordSearch": keyword, "resultsPerPage": 5}
-    resp = requests.get(NVD_BASE_URL, params=params)
+    try:
+        resp = session.get(NVD_BASE_URL, params=params, timeout=REQUEST_TIMEOUT)
+    except requests.RequestException as exc:
+        console.print(
+            f"[bold red]Network error while searching NVD.[/]\n{exc}\n"
+            "[dim]If you installed via Snap, ensure the 'network' plug is connected: "
+            "'snap connections cvecli'.[/]"
+        )
+        return
+
     if resp.status_code == 200:
-        data = resp.json()
+        try:
+            data = resp.json()
+        except ValueError:
+            console.print("[bold red]Error: NVD API returned invalid JSON.[/]")
+            return
         results = data.get('vulnerabilities', [])
         if not results:
             console.print(f"[bold red]No CVEs found for keyword: {keyword}")
@@ -86,7 +125,9 @@ def search_cve_by_keyword(keyword):
             if cve_id:
                 search_cve_by_id(cve_id)
     else:
-        console.print(f"[bold red]Error: Could not fetch CVEs for keyword: {keyword}")
+        console.print(
+            f"[bold red]Error: Could not fetch CVEs for keyword '{keyword}' (HTTP {resp.status_code}).[/]"
+        )
 
 def interactive_menu():
     console.print("[bold green]\n==============================\n[bold yellow]Made by DEBASIS - CVE Checker CLI\n==============================\n", style="bold green")