Merge pull request #17 from tainguyenbp/feat/learning-hacking-with-golang-20240706

test bash script

Author: tainguyenbp

bash-basic/monitors-system-health/monitors-system-health.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+function _gp
+check_cpu() {
+    local threshold=80
+    local count5min=0
+    local countTotal=0
+    local iterations=3 # 3x10 sec
+    local max_count=$(bc <<< 300/10) # 5 minutes / 10 seconds interval
+
+    while true; do
+        cpu_usage=$(top -bn2 | grep "Cpu(s)" | sed -n '2p' | awk '{print $2}' | cut -d'.' -f1)
+        ((countTotal++))
+        if [ "$cpu_usage" -gt "$threshold" ]; then
+            ((count++))
+            if [ "$count" -ge "$max_count" ]; then
+                echo "CPU usage has been above $threshold% for more than 5 minutes" >&2
+                break # Exit the loop after alerting once
+            fi
+        else
+            count5min=0 # Reset counter because CPU usage dropped below threshold
+        fi
+        if [ "$countTotal" -eq "$iterations" ]; then
+            break # Exit the loop after 5 minutes
+        fi
+        echo "CPU usage is $cpu_usage% - Threshold: $threshold% .. waiting.."
+        sleep 10 # Check every 10 seconds
+    done
+}
+
+function _check_disk_space() {
+    local threshold=10 # Set threshold to 10%
+    local disk_usage=$(df / | grep / | awk '{ print $5 }' | sed 's/%//g')
+
+    if [ "$disk_usage" -gt $((100 - threshold)) ]; then
+        echo "Disk space on root partition is less than $threshold% available." &>2
+    else
+        echo "Disk space on root partition is sufficient."
+    fi
+}    
+
+function _check_disk_space
+function _check_cpu

bash-basic/monitors-system-health/readme.md

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+# System monitoring Bash script
+Write a bash script that monitors system health and sends an alert if any of the following conditions are met:
+
+The CPU usage exceeds 80% for more than 5 minutes.
+The available disk space on the root partition is less than 10%.
+If any condition is met, the script should output an appropriate message to the standard error (stderr) indicating the issue.
+You can use the following template to create your script:
+```
+check_cpu() {
+    local threshold=80
+    #... other variables
+
+    while true; do
+        # Check CPU usage
+        # Your CPU usage check logic here
+    done
+}
+
+check_disk_space() {
+    local threshold=10
+    #... other variables
+
+    # Check disk space
+    # Your disk space check logic here
+}
+
+check_disk_space
+check_cpu  
+
+```
+
+# Solution
+Below is an example of a bash script that monitors CPU usage and disk space, sending an alert if the conditions are met.
+
+Your solution may vary and be written differently, however if you are not familiar with bash scripting, we recommend you to learn the basics of bash scripting before attempting this question.
+```
+function _check_cpu() {
+    local threshold=80
+    local count5min=0
+    local countTotal=0
+    local iterations=3 # 3x10 sec
+    local max_count=$(bc <<< 300/10) # 5 minutes / 10 seconds interval
+
+    while true; do
+        cpu_usage=$(top -bn2 | grep "Cpu(s)" | sed -n '2p' | awk '{print $2}' | cut -d'.' -f1)
+        ((countTotal++))
+        if [ "$cpu_usage" -gt "$threshold" ]; then
+            ((count++))
+            if [ "$count" -ge "$max_count" ]; then
+                echo "CPU usage has been above $threshold% for more than 5 minutes" >&2
+                break # Exit the loop after alerting once
+            fi
+        else
+            count5min=0 # Reset counter because CPU usage dropped below threshold
+        fi
+        if [ "$countTotal" -eq "$iterations" ]; then
+            break # Exit the loop after 5 minutes
+        fi
+        echo "CPU usage is $cpu_usage% - Threshold: $threshold% .. waiting.."
+        sleep 10 # Check every 10 seconds
+    done
+}
+
+function _check_disk_space() {
+    local threshold=10 # Set threshold to 10%
+    local disk_usage=$(df / | grep / | awk '{ print $5 }' | sed 's/%//g')
+
+    if [ "$disk_usage" -gt $((100 - threshold)) ]; then
+        echo "Disk space on root partition is less than $threshold% available." &>2
+    else
+        echo "Disk space on root partition is sufficient."
+    fi
+}    
+
+_check_disk_space
+_check_cpu
+
+```

hacking-go/cross-site-request-forgery/go.mod

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+module github.com/gorilla/csrf
+
+go 1.22.3

python-basic/.DS_Store

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+# Use an official Python runtime as a parent image
+FROM python:3.9-slim
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the current directory contents into the container at /app
+COPY . /app
+
+# Install any needed packages specified in requirements.txt
+RUN pip install --no-cache-dir Flask requests
+
+# Make port 3000 available to the world outside this container
+EXPOSE 3000
+
+# Define environment variable
+ENV FLASK_APP=app.py
+
+# Run the application
+CMD ["flask", "run", "--host=0.0.0.0", "--port=3000"]

python-basic/flask-app/Dockerfile

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+from flask import Flask, request, jsonify
+
+import requests
+
+app = Flask(__name__)
+
+# Fetch data from JSONPlaceholder
+
+API_URL = "https://jsonplaceholder.typicode.com/posts"
+
+@app.route('/posts', methods=['GET'])
+
+def get_posts():
+    user_id = request.args.get('userId')
+    response = requests.get(API_URL)
+    posts = response.json()
+
+    # Filter posts by userId if provided
+    if user_id:
+
+        posts = [post for post in posts if post['userId'] == int(user_id)]
+
+    return jsonify(posts)
+
+if __name__ == '__main__':
+
+    app.run(host='0.0.0.0', port=5000)
+