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from flask import Flask, render_template, request, send_file
import os
import requests
from pyhtml2pdf import converter
import re
import subprocess
app = Flask(__name__)
def fetch_html_content(host, slug):
url = "https://gql.hashnode.com/"
query = f"""
query Publication {{
publication(host: "{host}") {{
post(slug: "{slug}") {{
title
content {{
html
}}
author {{
name
}}
}}
}}
}}
"""
data = {"query": query}
response = requests.post(url, json=data)
if response.status_code == 200:
result = response.json()
title = result.get("data", {}).get("publication", {}).get("post", {}).get("title", "")
author_name = result.get("data", {}).get("publication", {}).get("post", {}).get("author", {}).get("name", "")
html_content = result.get("data", {}).get("publication", {}).get("post", {}).get("content", {}).get("html", "")
return title, author_name, html_content
else:
print(f"GraphQL request failed with status code {response.status_code}: {response.text}")
return None, None, None
def remove_emojis(html_content):
emoji_pattern = re.compile("["
"\U0001F600-\U0001F64F"
"\U0001F300-\U0001F5FF"
"\U0001F680-\U0001F6FF"
"\U0001F700-\U0001F77F"
"\U0001F780-\U0001F7FF"
"\U0001F800-\U0001F8FF"
"\U0001F900-\U0001F9FF"
"\U0001FA00-\U0001FA6F"
"\U0001FA70-\U0001FAFF"
"\U00002702-\U000027B0"
"\U000024C2-\U0001F251"
"]+", flags=re.UNICODE)
cleaned_html = emoji_pattern.sub('', html_content)
return cleaned_html
def create_html_file(html_content):
html_filename = "/tmp/output.html"
with open(html_filename, "w", encoding="utf-8") as html_file:
html_file.write(html_content)
return html_filename
def convert_html_to_pdf(title, author_name, html_filename, pdf_filename):
# Use the title as header in the PDF
header_html = f"<h1>{title}</h1>"
# Combine the header HTML and the existing HTML content
full_html = header_html + open(html_filename, "r", encoding="utf-8").read()
# Add footer only on the last page
footer_html = f'<div style="text-align: center; margin-top: 20px;">Hashnode / {author_name}</div>'
full_html += footer_html
# Save the combined HTML to a temporary file
temp_html_filename = "/tmp/temp_output.html"
with open(temp_html_filename, "w", encoding="utf-8") as temp_html_file:
temp_html_file.write(full_html)
# Convert the combined HTML to PDF
converter.convert(f'file:///{os.path.abspath(temp_html_filename)}', pdf_filename, install_driver=False)
# Remove the temporary HTML file
os.remove(temp_html_filename)
def convert_html_to_epub(title, html_filename, epub_filename):
# Use subprocess to call Pandoc for HTML to EPUB conversion
subprocess.run(['pandoc', html_filename, '-o', epub_filename, '--metadata', f'title={title}'])
# Remove the temporary HTML file
os.remove(html_filename)
def extract_host_and_slug(blog_link):
# Assuming the format is "https://host/slug"
parts = blog_link.split("/")
host = parts[2] if len(parts) > 2 else ""
slug = parts[3] if len(parts) > 3 else ""
return host, slug
@app.route('/', methods=['GET', 'POST'])
def index():
host = ""
slug = ""
title = ""
author_name = ""
html_content = ""
if request.method == 'POST':
blog_link = request.form['blog_link']
host, slug = extract_host_and_slug(blog_link)
title, author_name, html_content = fetch_html_content(host, slug)
return render_template('index.html', host=host, slug=slug, title=title, author_name=author_name, html_content=html_content)
@app.route('/convert_pdf', methods=['POST'])
def convert_pdf():
host = request.form['host']
slug = request.form['slug']
title, author_name, html_content = fetch_html_content(host, slug)
cleaned_html = remove_emojis(html_content)
html_filename = create_html_file(cleaned_html)
pdf_filename = "/tmp/article.pdf"
convert_html_to_pdf(title, author_name, html_filename, pdf_filename)
# Move removal outside the if condition
# Remove HTML file after both PDF and EPUB conversions
if os.path.exists(html_filename):
os.remove(html_filename)
# Provide a download link for the generated PDF
return send_file(pdf_filename, as_attachment=True)
@app.route('/convert_epub', methods=['POST'])
def convert_epub():
host = request.form['host']
slug = request.form['slug']
title, _, html_content = fetch_html_content(host, slug)
cleaned_html = remove_emojis(html_content)
html_filename = create_html_file(cleaned_html)
epub_filename = "/tmp/article.epub"
convert_html_to_epub(title, html_filename, epub_filename)
# Move removal outside the if condition
# Remove HTML file after both PDF and EPUB conversions
if os.path.exists(html_filename):
os.remove(html_filename)
# Provide a download link for the generated EPUB
return send_file(epub_filename, as_attachment=True)
if __name__ == "__main__":
app.run(host='0.0.0.0',port=7860)
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