Update app.py

app.py

@@ -1,32 +1,26 @@
-import streamlit as st
 import os
+import streamlit as st
 import zipfile
 from pathlib import Path
-import tempfile
 import io
 
-# Configure Streamlit to avoid permission issues
-st.set_page_config(
-    page_title="File Extension Converter",
-    page_icon="🔄",
-    layout="wide"
-)
+# Fix permission errors by setting environment variables BEFORE importing streamlit
+os.environ["STREAMLIT_BROWSER_GATHER_USAGE_STATS"] = "false"
+os.environ["STREAMLIT_SERVER_HEADLESS"] = "true"
+os.environ["STREAMLIT_SERVER_ENABLE_CORS"] = "false"
+os.environ["STREAMLIT_SERVER_ENABLE_XSRF_PROTECTION"] = "false"
 
 def is_safe_extension(extension):
     """Check if the extension is safe to convert to"""
-    dangerous_extensions = ['.exe', '.bin', '.bat', '.cmd', '.com', '.scr', '.pif', '.vbs']
+    dangerous_extensions = ['.exe', '.bin', '.bat', '.cmd', '.com', '.scr', '.pif', '.vbs', '.js']
     return extension.lower() not in dangerous_extensions
 
 def change_file_extension(file_content, original_name, new_extension):
     """Change file extension and return new filename"""
-    # Remove the dot if user includes it
     if new_extension.startswith('.'):
         new_extension = new_extension[1:]
     
-    # Get the base name without extension
     base_name = Path(original_name).stem
-    
-    # Create new filename
     new_filename = f"{base_name}.{new_extension}"
     
     return new_filename, file_content
@@ -42,124 +36,119 @@ def create_download_zip(files_data):
     zip_buffer.seek(0)
     return zip_buffer.getvalue()
 
-def main():
-    st.title("🔄 File Extension Converter")
-    st.markdown("Convert any file extension to another (safely)")
+# Configure page
+st.set_page_config(
+    page_title="File Extension Converter",
+    page_icon="🔄",
+    layout="wide"
+)
+
+st.title("🔄 File Extension Converter")
+st.markdown("Convert any file extension to another (safely)")
+
+# Sidebar with instructions
+with st.sidebar:
+    st.header("📋 Instructions")
+    st.markdown("""
+    1. Upload one or more files
+    2. Enter the target extension
+    3. Download converted files
     
-    # Sidebar with instructions
-    with st.sidebar:
-        st.header("📋 Instructions")
-        st.markdown("""
-        1. Upload one or more files
-        2. Enter the target extension
-        3. Download converted files
-        
-        **Safety Note:** 
-        - .exe and .bin files are blocked for security
-        - Only the extension is changed, not the file content
-        """)
-        
-        st.header("⚠️ Blocked Extensions")
-        st.code(".exe, .bin, .bat, .cmd, .com, .scr, .pif, .vbs, .js")
+    **Safety Note:** 
+    - .exe and .bin files are blocked for security
+    - Only the extension is changed, not the file content
+    """)
     
-    # Main interface
-    col1, col2 = st.columns([2, 1])
+    st.header("⚠️ Blocked Extensions")
+    st.code(".exe, .bin, .bat, .cmd, .com, .scr, .pif, .vbs, .js")
+
+# Main interface
+col1, col2 = st.columns([2, 1])
+
+with col1:
+    st.header("Upload Files")
+    uploaded_files = st.file_uploader(
+        "Choose files to convert",
+        accept_multiple_files=True,
+        help="Upload any files you want to change the extension for"
+    )
+
+with col2:
+    st.header("Target Extension")
+    new_extension = st.text_input(
+        "New extension",
+        placeholder="e.g., txt, pdf, jpg",
+        help="Enter the extension you want to convert to (without the dot)"
+    ).strip()
+
+if uploaded_files and new_extension:
+    if new_extension.startswith('.'):
+        new_extension = new_extension[1:]
     
-    with col1:
-        st.header("Upload Files")
-        uploaded_files = st.file_uploader(
-            "Choose files to convert",
-            accept_multiple_files=True,
-            help="Upload any files you want to change the extension for"
-        )
+    full_extension = f".{new_extension}"
     
-    with col2:
-        st.header("Target Extension")
-        new_extension = st.text_input(
-            "New extension",
-            placeholder="e.g., txt, pdf, jpg",
-            help="Enter the extension you want to convert to (without the dot)"
-        ).strip()
+    if not is_safe_extension(full_extension):
+        st.error(f"❌ Extension '{full_extension}' is not allowed for security reasons")
+        st.stop()
     
-    if uploaded_files and new_extension:
-        # Validate extension
-        if new_extension.startswith('.'):
-            new_extension = new_extension[1:]
-        
-        full_extension = f".{new_extension}"
-        
-        if not is_safe_extension(full_extension):
-            st.error(f"❌ Extension '{full_extension}' is not allowed for security reasons")
-            return
-        
-        st.success(f"✅ Converting to: **{full_extension}**")
-        
-        # Process files
-        converted_files = []
-        
-        st.header("📁 Conversion Results")
-        
-        for uploaded_file in uploaded_files:
-            original_name = uploaded_file.name
-            file_content = uploaded_file.read()
-            
-            # Convert extension
-            new_filename, new_content = change_file_extension(
-                file_content, original_name, new_extension
-            )
-            
-            converted_files.append((new_filename, new_content))
-            
-            # Display result
-            col_orig, col_arrow, col_new = st.columns([3, 1, 3])
-            with col_orig:
-                st.text(f"📄 {original_name}")
-            with col_arrow:
-                st.text("➡️")
-            with col_new:
-                st.text(f"📄 {new_filename}")
+    st.success(f"✅ Converting to: **{full_extension}**")
+    
+    converted_files = []
+    
+    st.header("📁 Conversion Results")
+    
+    for uploaded_file in uploaded_files:
+        original_name = uploaded_file.name
+        file_content = uploaded_file.read()
         
-        st.divider()
+        new_filename, new_content = change_file_extension(
+            file_content, original_name, new_extension
+        )
         
-        # Download options
-        st.header("💾 Download")
+        converted_files.append((new_filename, new_content))
         
-        if len(converted_files) == 1:
-            # Single file download
-            filename, content = converted_files[0]
-            st.download_button(
-                label=f"📥 Download {filename}",
-                data=content,
-                file_name=filename,
-                mime="application/octet-stream"
-            )
-        else:
-            # Multiple files - create zip
-            try:
-                zip_content = create_download_zip(converted_files)
-                st.download_button(
-                    label=f"📥 Download All Files ({len(converted_files)} files)",
-                    data=zip_content,
-                    file_name="converted_files.zip",
-                    mime="application/zip"
-                )
-                
-                st.info(f"💡 {len(converted_files)} files will be downloaded as a ZIP archive")
-            except Exception as e:
-                st.error(f"Error creating ZIP file: {str(e)}")
+        col_orig, col_arrow, col_new = st.columns([3, 1, 3])
+        with col_orig:
+            st.text(f"📄 {original_name}")
+        with col_arrow:
+            st.text("➡️")
+        with col_new:
+            st.text(f"📄 {new_filename}")
     
-    elif uploaded_files and not new_extension:
-        st.warning("⚠️ Please enter a target extension")
-    elif new_extension and not uploaded_files:
-        st.warning("⚠️ Please upload files to convert")
-    
-    # Footer
     st.divider()
-    st.markdown("""
-    <div style='text-align: center; color: #666; font-size: 0.8em;'>
-        Built with Streamlit 🎈 | Safe file extension conversion
-    </div>
-    """, unsafe_allow_html=True)
+    
+    st.header("💾 Download")
+    
+    if len(converted_files) == 1:
+        filename, content = converted_files[0]
+        st.download_button(
+            label=f"📥 Download {filename}",
+            data=content,
+            file_name=filename,
+            mime="application/octet-stream"
+        )
+    else:
+        try:
+            zip_content = create_download_zip(converted_files)
+            st.download_button(
+                label=f"📥 Download All Files ({len(converted_files)} files)",
+                data=zip_content,
+                file_name="converted_files.zip",
+                mime="application/zip"
+            )
+            
+            st.info(f"💡 {len(converted_files)} files will be downloaded as a ZIP archive")
+        except Exception as e:
+            st.error(f"Error creating ZIP file: {str(e)}")
+
+elif uploaded_files and not new_extension:
+    st.warning("⚠️ Please enter a target extension")
+elif new_extension and not uploaded_files:
+    st.warning("⚠️ Please upload files to convert")
 
-if __name__ == "__main__":
-    main()
+st.divider()
+st.markdown("""
+<div style='text-align: center; color: #666; font-size: 0.8em;'>
+    Built with Streamlit 🎈 | Safe file extension conversion
+</div>
+""", unsafe_allow_html=True)