Create app.py

app.py

@@ -0,0 +1,163 @@
+import streamlit as st
+import hashlib
+import pandas as pd
+import qrcode
+from io import BytesIO
+from datetime import datetime
+import json
+import base64
+
+# Set page config
+st.set_page_config(
+    page_title="Document Integrity Checker",
+    page_icon="🔐",
+    layout="wide"
+)
+
+# Custom CSS
+st.markdown("""
+    <style>
+        .stApp {
+            max-width: 1200px;
+            margin: 0 auto;
+        }
+        .status-success {
+            padding: 1rem;
+            border-radius: 4px;
+            background-color: #dcfce7;
+            color: #166534;
+        }
+        .status-error {
+            padding: 1rem;
+            border-radius: 4px;
+            background-color: #fee2e2;
+            color: #991b1b;
+        }
+        .hash-display {
+            font-family: monospace;
+            padding: 1rem;
+            background-color: #f8fafc;
+            border-radius: 4px;
+        }
+    </style>
+""", unsafe_allow_html=True)
+
+def calculate_hash(file_bytes):
+    """Calculate SHA-256 hash of file"""
+    sha256_hash = hashlib.sha256()
+    sha256_hash.update(file_bytes)
+    return sha256_hash.hexdigest()
+
+def generate_qr(data):
+    """Generate QR code for hash"""
+    qr = qrcode.QRCode(version=1, box_size=10, border=5)
+    qr.add_data(data)
+    qr.make(fit=True)
+    img = qr.make_image(fill_color="black", back_color="white")
+    
+    # Convert to bytes
+    buffered = BytesIO()
+    img.save(buffered, format="PNG")
+    return buffered.getvalue()
+
+def save_to_history(filename, file_hash):
+    """Save verification to history"""
+    history = json.loads(st.session_state.get('history', '[]'))
+    history.insert(0, {
+        'filename': filename,
+        'hash': file_hash,
+        'timestamp': datetime.now().isoformat()
+    })
+    # Keep only last 10 entries
+    history = history[:10]
+    st.session_state['history'] = json.dumps(history)
+
+def get_history():
+    """Get verification history"""
+    try:
+        return json.loads(st.session_state.get('history', '[]'))
+    except:
+        return []
+
+def main():
+    # Header
+    st.title("🔐 Document Integrity Checker")
+    st.markdown("Verifikasi & Lindungi Integritas Dokumen Anda dengan SHA-256")
+
+    # Main content
+    col1, col2 = st.columns([2, 1])
+
+    with col1:
+        st.subheader("Upload Document")
+        uploaded_files = st.file_uploader(
+            "Drag and drop files here",
+            accept_multiple_files=True,
+            type=['pdf', 'doc', 'docx', 'txt', 'jpg', 'png']
+        )
+
+        if uploaded_files:
+            for uploaded_file in uploaded_files:
+                # Calculate hash
+                file_bytes = uploaded_file.read()
+                file_hash = calculate_hash(file_bytes)
+
+                # Display hash
+                st.markdown(f"**File:** {uploaded_file.name}")
+                st.markdown(f"""
+                    <div class='hash-display'>
+                        {file_hash}
+                    </div>
+                """, unsafe_allow_html=True)
+
+                # Generate and display QR
+                qr_code = generate_qr(file_hash)
+                st.image(qr_code, caption="Scan untuk verifikasi hash")
+
+                # Save to history
+                save_to_history(uploaded_file.name, file_hash)
+
+                # Verification input
+                expected_hash = st.text_input("Masukkan hash untuk verifikasi:", key=f"verify_{uploaded_file.name}")
+                if expected_hash:
+                    if expected_hash.lower() == file_hash.lower():
+                        st.markdown("""
+                            <div class='status-success'>
+                                ✅ Hash cocok! Dokumen terverifikasi.
+                            </div>
+                        """, unsafe_allow_html=True)
+                    else:
+                        st.markdown("""
+                            <div class='status-error'>
+                                ❌ Hash tidak cocok! Dokumen mungkin telah diubah.
+                            </div>
+                        """, unsafe_allow_html=True)
+
+    with col2:
+        st.subheader("Riwayat Verifikasi")
+        history = get_history()
+        if history:
+            for entry in history:
+                with st.expander(f"{entry['filename']}"):
+                    st.code(entry['hash'], language='text')
+                    st.text(f"Verified: {datetime.fromisoformat(entry['timestamp']).strftime('%Y-%m-%d %H:%M:%S')}")
+        else:
+            st.info("Belum ada riwayat verifikasi")
+
+    # Features explanation
+    st.markdown("---")
+    feat_col1, feat_col2, feat_col3 = st.columns(3)
+    
+    with feat_col1:
+        st.markdown("### 🚀 Real-time Processing")
+        st.markdown("Hasil hash instan saat file diunggah")
+    
+    with feat_col2:
+        st.markdown("### 📁 Multiple Files")
+        st.markdown("Proses beberapa file sekaligus")
+    
+    with feat_col3:
+        st.markdown("### 📱 QR Code")
+        st.markdown("Share hash dengan mudah via QR")
+
+if __name__ == "__main__":
+    main()