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import time
import shutil
from typing import List
from pathlib import Path
import zipfile
import xml.etree.ElementTree as ET
import re
from fastapi import FastAPI, File, UploadFile, HTTPException, Body
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, JSONResponse
from starlette.requests import Request
# ---------- CONFIG ----------
UPLOAD_DIR = Path("uploads")
UPLOAD_DIR.mkdir(parents=True, exist_ok=True)
OUTPUT_DIR = Path("output")
OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
# ---------- APP SETUP ----------
app = FastAPI()
# Configure CORS (Angular frontend -> Python backend)
origins = [
"http://localhost:4200",
"http://localhost:3000",
]
app.add_middleware(
CORSMiddleware,
allow_origins=origins,
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
# Optional: request logging (safe - does NOT print file bytes)
@app.middleware("http")
async def access_log(request: Request, call_next):
t0 = time.time()
response = await call_next(request)
ms = (time.time() - t0) * 1000
print(f"[{request.method}] {request.url.path} -> {response.status_code} ({ms:.2f} ms)")
return response
@app.get("/")
def health_check():
return {"status": "running", "service": "PowerPoint Accessibility Backend"}
# ---------- UPLOAD ROUTE ----------
@app.post("/upload")
async def upload_files(files: List[UploadFile] = File(...)):
"""
Accepts PowerPoint files, analyzes them, and returns accessibility report.
"""
if len(files) == 0:
raise HTTPException(status_code=400, detail="No file uploaded")
if len(files) > 7:
raise HTTPException(
status_code=400,
detail=f"Too many files. You uploaded {len(files)}, but the limit is 7."
)
# For now, handle single file upload
file = files[0]
filename = file.filename or "unnamed.pptx"
filename_lower = filename.lower()
# Validate extension
allowed_ext = (".pptx", ".ppt", ".pps", ".potx")
if not filename_lower.endswith(allowed_ext):
raise HTTPException(
status_code=400,
detail=f"Invalid file type. Please upload a PowerPoint file (.pptx, .ppt, .pps, or .potx)"
)
# Save file
try:
file_location = UPLOAD_DIR / filename
with file_location.open("wb") as buffer:
shutil.copyfileobj(file.file, buffer)
except Exception as e:
print(f"Error saving {filename}: {e}")
raise HTTPException(status_code=500, detail=f"Failed to save file: {str(e)}")
# Analyze the PowerPoint file
try:
report = analyze_powerpoint(file_location, filename)
return JSONResponse(content={
"fileName": filename,
"suggestedFileName": filename,
"report": report
})
except Exception as e:
print(f"Error analyzing {filename}: {e}")
raise HTTPException(status_code=500, detail=f"Failed to analyze file: {str(e)}")
def analyze_powerpoint(file_path: Path, filename: str):
"""
Analyze PowerPoint file for accessibility issues.
Checks:
1. Slide titles (missing or empty)
2. Image alt text
3. GIF detection
4. Presentation title
5. File naming
6. Hidden slides
7. List formatting issues
"""
report = {
"fileName": filename,
"suggestedFileName": filename,
"summary": {"fixed": 0, "flagged": 0},
"details": {
"titleNeedsFixing": False,
"slidesMissingTitles": [],
"imagesMissingOrBadAlt": [],
"gifsDetected": [],
"fileNameNeedsFixing": False,
"hiddenSlidesDetected": [],
"listFormattingIssues": [],
}
}
try:
# Open PPTX as ZIP
with zipfile.ZipFile(file_path, 'r') as zip_file:
# Check presentation title
try:
core_xml = zip_file.read('docProps/core.xml').decode('utf-8')
if '<dc:title></dc:title>' in core_xml or '<dc:title/>' in core_xml:
report["details"]["titleNeedsFixing"] = True
report["summary"]["flagged"] += 1
except:
pass
# Check filename
if '_' in filename or filename.lower().startswith('presentation') or filename.lower().startswith('untitled'):
report["details"]["fileNameNeedsFixing"] = True
report["summary"]["flagged"] += 1
# Get list of slides
slides = [name for name in zip_file.namelist() if name.startswith('ppt/slides/slide') and name.endswith('.xml')]
slides.sort()
# Analyze each slide
for i, slide_path in enumerate(slides):
slide_number = i + 1
slide_xml = zip_file.read(slide_path).decode('utf-8')
# Check slide title
title_check = check_slide_title(slide_xml, slide_number)
if title_check["missing"]:
report["details"]["slidesMissingTitles"].append(title_check)
report["summary"]["flagged"] += 1
# Check images
image_issues = check_slide_images(slide_xml, slide_number)
if image_issues:
report["details"]["imagesMissingOrBadAlt"].extend(image_issues)
report["summary"]["flagged"] += len(image_issues)
# Check for list formatting issues
list_issues = check_list_formatting(slide_xml, slide_number)
if list_issues:
report["details"]["listFormattingIssues"].extend(list_issues)
report["summary"]["flagged"] += len(list_issues)
# Check for GIFs
gif_files = [name for name in zip_file.namelist() if name.startswith('ppt/media/') and name.lower().endswith('.gif')]
if gif_files:
report["details"]["gifsDetected"] = gif_files
report["summary"]["flagged"] += len(gif_files)
except Exception as e:
print(f"Error analyzing PowerPoint: {e}")
raise
return report
def check_slide_title(slide_xml: str, slide_number: int):
"""Check if slide has a title."""
# Look for title placeholder
title_pattern = r'<p:ph[^>]*type="(title|ctrTitle)"[^>]*>'
has_title_placeholder = re.search(title_pattern, slide_xml)
if not has_title_placeholder:
return {
"missing": True,
"slideNumber": slide_number,
"message": f"Slide {slide_number} is missing a title"
}
# Check if title has text
text_pattern = r'<a:t[^>]*>(.*?)</a:t>'
text_matches = re.findall(text_pattern, slide_xml)
if not any(text.strip() for text in text_matches):
return {
"missing": True,
"slideNumber": slide_number,
"message": f"Slide {slide_number} has an empty title"
}
return {"missing": False}
def check_list_formatting(slide_xml: str, slide_number: int):
"""Check for hyphenated paragraphs that should be lists."""
issues = []
# Find all text elements
text_pattern = r'<a:t[^>]*>(.*?)</a:t>'
text_matches = re.findall(text_pattern, slide_xml)
for text in text_matches:
# Check for hyphenated list patterns
if re.match(r'^[\s]*[-–—•]\s+.+', text):
issues.append({
"slideNumber": slide_number,
"location": f"Slide {slide_number}",
"issue": f'Possible improperly formatted list: "{text[:50]}..."',
"type": "listFormatting"
})
return issues
def check_slide_images(slide_xml: str, slide_number: int):
"""Check images for missing alt text."""
issues = []
# Find all picture elements
pic_pattern = r'<p:pic[\s\S]*?</p:pic>'
pic_matches = re.findall(pic_pattern, slide_xml)
for pic_xml in pic_matches:
# Check for alt text in descr attribute
descr_pattern = r'<p:cNvPr[^>]*descr="([^"]*)"'
descr_match = re.search(descr_pattern, pic_xml)
alt_text = descr_match.group(1) if descr_match else ""
if not alt_text or alt_text.strip() == "":
issues.append({
"slideNumber": slide_number,
"location": f"Slide {slide_number}",
"issue": "Image missing alt text",
"type": "image"
})
return issues
# ---------- DOWNLOAD ROUTES ----------
@app.get("/download/{filename}")
def download_file(filename: str):
"""
Direct download by filename from /output.
"""
file_path = OUTPUT_DIR / filename
if not file_path.exists():
raise HTTPException(status_code=404, detail=f"File not found: {filename}")
return FileResponse(
path=str(file_path),
media_type="application/vnd.openxmlformats-officedocument.presentationml.presentation",
filename=filename
)
@app.post("/download")
async def download_latest(payload: dict = Body(default={})):
"""
Supports current frontend that POSTs to /download.
If payload contains {"filename": "..."} we use that.
Otherwise returns the newest file from /output.
"""
filename = payload.get("filename") if isinstance(payload, dict) else None
if filename:
file_path = OUTPUT_DIR / filename
if not file_path.exists():
raise HTTPException(status_code=404, detail=f"File not found: {filename}")
else:
candidates = [p for p in OUTPUT_DIR.glob("*") if p.is_file()]
if not candidates:
raise HTTPException(status_code=404, detail="No files available to download yet.")
file_path = max(candidates, key=lambda p: p.stat().st_mtime)
filename = file_path.name
return FileResponse(
path=str(file_path),
media_type="application/vnd.openxmlformats-officedocument.presentationml.presentation",
filename=filename
)
# ---------- RUN ----------
if __name__ == "__main__":
import uvicorn
uvicorn.run(app, host="127.0.0.1", port=5000)
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