It seems to work!

.gitignore

@@ -161,6 +161,7 @@ cython_debug/
 
 ## By rbehzadan@gmail.com
 .archive/
+.texlive/
 samples/
 *_[0-9]
 *_[0-9][0-9]

Dockerfile

@@ -4,7 +4,7 @@ FROM archlinux:base
 RUN pacman -Sy --noconfirm curl reflector && \
     reflector --latest 5 --sort rate --save /etc/pacman.d/mirrorlist && \
     sed -i '/\[options\]/a XferCommand = /usr/bin/curl -C - --fail --retry 3 --retry-delay 3 -o %o %u' /etc/pacman.conf && \
-    pacman -Syu --noconfirm --needed texlive-bin texlive-core texlive-latexextra texlive-fontsrecommended texlive-langenglish texlive-langgerman && \
+    pacman -Syu --noconfirm --needed texlive-basic texlive-bibtexextra texlive-bin texlive-binextra texlive-context texlive-fontsrecommended texlive-fontsextra texlive-fontutils texlive-formatsextra texlive-langenglish texlive-langeuropean texlive-langfrench texlive-langgerman texlive-latex texlive-latexextra texlive-latexrecommended texlive-luatex texlive-mathscience texlive-metapost texlive-music texlive-pictures texlive-plaingeneric texlive-pstricks texlive-publishers && \
     pacman -Syu --noconfirm --needed python-fastapi uvicorn python-python-multipart && \
     yes | pacman -Scc
 

main.py

@@ -1,25 +1,60 @@
-import asyncio
-from fastapi import FastAPI, File, UploadFile
+from fastapi import FastAPI, File, UploadFile, HTTPException
 from fastapi.responses import StreamingResponse
 from io import BytesIO
+import asyncio
+import tempfile
+import zipfile
+import os
 
 app = FastAPI()
 
 @app.post("/tex2pdf")
-async def convert_to_pdf(file: UploadFile = File(...)):
-    input_file = BytesIO(await file.read())
+async def convert_to_pdf(zip_file: UploadFile = File(...)):
+    if zip_file.filename.endswith('.zip'):
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            # Unpack the zip file
+            with zipfile.ZipFile(BytesIO(await zip_file.read())) as z:
+                z.extractall(tmpdirname)
+        
+            # Change working directory to tmpdirname
+            os.chdir(tmpdirname)
+            
+            # Find the main LaTeX file (assuming a convention, e.g., main.tex)
+            main_tex_file = 'main.tex'
+            main_tex_path = os.path.join(tmpdirname, main_tex_file)
+            if not os.path.exists(main_tex_path):
+                raise HTTPException(status_code=400, detail="Main LaTeX file (main.tex) not found in the zip.")
 
-    process = await asyncio.create_subprocess_exec(
-        'pdflatex', '-f', 'pdf',
-        stdin=asyncio.subprocess.PIPE,
-        stdout=asyncio.subprocess.PIPE,
-        stderr=asyncio.subprocess.PIPE
-    )
+            # Compile the LaTeX document
+            cmd = ['pdflatex', '-interaction=nonstopmode', '-output-directory', tmpdirname, main_tex_path]
+            process = await asyncio.create_subprocess_exec(*cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
+            try:
+                print(f"Running pdflatex on {main_tex_path}")
+                stdout, stderr = await asyncio.wait_for(process.communicate(), timeout=120)
+                # print(f"pdflatex output: {stdout.decode()}")
+                # print(f"pdflatex errors: {stderr.decode()}")
+            except asyncio.TimeoutError:
+                return {"error": "Conversion timed out."}
 
-    output_pdf, error = await process.communicate(input=input_file.getvalue())
 
-    if process.returncode == 0:
-        return StreamingResponse(BytesIO(output_pdf), media_type='application/pdf')
+            if process.returncode != 0:
+                # Compilation failed
+                return {
+                    "error": "Conversion failed.",
+                    "details": {
+                        "stderr": stderr.decode(),
+                        "stdout": stdout.decode(),
+                    },
+                }
+
+            # Assuming the output PDF has the same base name as the main LaTeX file
+            output_pdf_path = os.path.join(tmpdirname, 'main.pdf')
+            if os.path.exists(output_pdf_path):
+                with open(output_pdf_path, 'rb') as f:
+                    pdf_content = f.read()
+                return StreamingResponse(BytesIO(pdf_content), media_type='application/pdf')
+            else:
+                return {"error": "PDF file not generated."}
     else:
-        return {"error": "Conversion failed.", "details": error.decode()}
+        raise HTTPException(status_code=400, detail="Uploaded file is not a zip file.")