gerboweb: Initial commit

The functionality is there, no design yet

1 files changed, 147 insertions, 0 deletions

diff --git a/gerboweb/gerboweb.py b/gerboweb/gerboweb.py
new file mode 100644
index 0000000..bf2921a
--- /dev/null
+++ b/gerboweb/gerboweb.py
@@ -0,0 +1,147 @@
+#!/usr/bin/env python3
+
+# TODO create systemd unit file
+# TODO create systemd tmpfiles.d config
+# TODO setup ansible deployment
+# TODO setup webserver user disk quota
+
+import tempfile
+import uuid
+from functools import wraps
+from os import path
+import os
+import sqlite3
+
+from flask import Flask, url_for, redirect, session, make_response, render_template, request, send_file, abort
+from flask_wtf import FlaskForm
+from flask_wtf.file import FileField
+from wtforms.fields import RadioField
+from wtforms.validators import DataRequired
+from werkzeug.utils import secure_filename
+
+from job_queue import JobQueue
+
+app = Flask(__name__, static_url_path='/static')
+app.config.from_envvar('GERBOWEB_SETTINGS')
+
+class UploadForm(FlaskForm):
+    upload_file = FileField(validators=[DataRequired()])
+
+class OverlayForm(UploadForm):
+    upload_file = FileField(validators=[DataRequired()])
+    side = RadioField('Side', choices=[('top', 'Top'), ('bottom', 'Bottom')])
+
+class ResetForm(FlaskForm):
+    pass
+
+job_queue = JobQueue(app.config['JOB_QUEUE_DB'])
+
+def tempfile_path(namespace):
+    """ Return a path for a per-session temporary file identified by the given namespace. Create the session tempfile
+    dir if necessary. The application tempfile dir is controlled via the upload_path config value and not managed by
+    this function. """
+    if not path.isdir(app.config['UPLOAD_PATH']):
+        os.mkdir(app.config['UPLOAD_PATH'])
+    sess_tmp = path.join(app.config['UPLOAD_PATH'], session['session_id'])
+    if not path.isdir(sess_tmp):
+        os.mkdir(sess_tmp)
+
+    return path.join(sess_tmp, namespace)
+
+def require_session_id(fun):
+    @wraps(fun)
+    def wrapper(*args, **kwargs):
+        if 'session_id' not in session:
+            session['session_id'] = str(uuid.uuid4())
+        return fun(*args, **kwargs)
+    return wrapper
+
+@app.route('/')
+@require_session_id
+def index():
+    forms = {
+            'gerber_form': UploadForm(),
+            'overlay_form': OverlayForm(),
+            'reset_form': ResetForm() }
+
+    for job in ('vector_job', 'render_job'):
+        if job in session and job_queue[session[job]].finished:
+            del session[job]
+
+    r = make_response(render_template('index.html',
+            has_renders = path.isfile(tempfile_path('gerber.zip')),
+            has_output = path.isfile(tempfile_path('overlay.png')),
+             **forms))
+    if 'vector_job' in session or 'render_job' in session:
+        r.headers.set('refresh', '10')
+    return r
+
+# NOTES about the gerber and overlay file upload routines
+#  * The maximum upload size is limited by the MAX_CONTENT_LENGTH config setting.
+#  * The uploaded files are deleted after a while by systemd tmpfiles.d
+# TODO: validate this setting applies *after* gzip transport compression
+
+@app.route('/upload/<namespace>', methods=['POST'])
+@require_session_id
+def upload(namespace):
+    if namespace not in ('gerber', 'overlay'):
+        return abort(400, 'Invalid upload type')
+
+    upload_form = UploadForm() if namespace == 'gerber' else OverlayForm()
+    if upload_form.validate_on_submit():
+        f = upload_form.upload_file.data
+
+        if namespace == 'gerber':
+            f.save(tempfile_path('gerber.zip'))
+            session['filename'] = secure_filename(f.filename) # Cache filename for later download
+            if 'render_job' in session:
+                job_queue.drop(session['render_job'])
+            session['render_job'] = job_queue.enqueue('render',
+                    session_id=session['session_id'],
+                    client=request.remote_addr)
+        else: # namespace == 'vector'
+            f.save(tempfile_path('overlay.png'))
+
+        # Re-vectorize if either file has changed
+        if path.isfile(tempfile_path('gerber.zip')) and path.isfile(tempfile_path('overlay.png')):
+            if 'vector_job' in session:
+                job_queue.drop(session['vector_job'])
+            session['vector_job'] = job_queue.enqueue('vector',
+                    client=request.remote_addr,
+                    session_id=session['session_id'],
+                    side=upload_form.side.data)
+
+    return redirect(url_for('index'))
+
+@app.route('/render/preview/<side>')
+def render_preview(side):
+    if not side in ('top', 'bottom'):
+        return abort(400, 'side must be either "top" or "bottom"')
+    return send_file(tempfile_path(f'render_{side}.small.png'))
+
+@app.route('/render/download/<side>')
+def render_download(side):
+    if not side in ('top', 'bottom'):
+        return abort(400, 'side must be either "top" or "bottom"')
+    return send_file(tempfile_path(f'render_{side}.png'),
+            mimetype='image/png',
+            as_attachment=True,
+            attachment_filename=f'{path.splitext(session["filename"])[0]}_render.png')
+
+@app.route('/output/download')
+def output_download():
+    return send_file(tempfile_path('gerber_out.zip'),
+            mimetype='application/zip',
+            as_attachment=True,
+            attachment_filename=f'{path.splitext(session["filename"])[0]}_with_artwork.zip')
+
+@app.route('/session_reset', methods=['POST'])
+@require_session_id
+def session_reset():
+    if 'render_job' in session:
+        session['render_job'].abort()
+    if 'vector_job' in session:
+        session['vector_job'].abort()
+    session.clear()
+    return redirect(url_for('index'))
+