Implement file handler with separated data per user

app.py

@@ -1,76 +1,22 @@
-from flask import Flask, render_template, request, redirect, url_for, session
+from flask import Flask, render_template, request, redirect, url_for, session, send_from_directory
 from PIL import Image
 from gen_image import gen_image
 from printer_info import *
 from datetime import datetime
 from print import *
 from format_image import *
+from file_handler import *
+from colorama import Fore, Style
 import os
 
+generated_image_filename = "generated.png"
+uploaded_image_filename = "uploaded" #extention is depended on uploaded file format
+
 app = Flask(__name__)
-app.config['UPLOAD_FOLDER'] = 'static/uploads'
+
-app.config['TEXT_FOLDER'] = 'static/text'
+
 app.secret_key = "blahaj"
 
-# Ensure the upload directory exists
-if not os.path.exists(app.config['UPLOAD_FOLDER']):
-    os.makedirs(app.config['UPLOAD_FOLDER'])
-if not os.path.exists(app.config['TEXT_FOLDER']):
-    os.makedirs(app.config['TEXT_FOLDER'])
-
-#TODO: make it so sessions don't interfere with eachother
-
-@app.route('/', methods=['GET', 'POST'])
-def base():
-    return render_template('base.html')
-
-@app.route('/image', methods=['GET', 'POST'])
-def image():
-    if request.method == 'POST':
-        if 'image' not in request.files:
-            return redirect(request.url)
-        file = request.files['image']
-
-        if file.filename == '':
-            return redirect(request.url)
-        if file:
-            extension = os.path.splitext(file.filename)[1]
-            filepath = os.path.join(app.config['UPLOAD_FOLDER'], "upload" + extension)
-            session["filepath"] = filepath
-
-            file.save(filepath)
-
-            # Process image #
-            format_image(filepath).save(filepath)
-            #################
-            
-            session["filename"] = "upload"+extension
-            return render_template('image.html', filename=session["filename"], cut=session["cut"])
-
-    session["cut"] = True
-    return render_template('image.html', cut=True)
-
-
-#TODO: maybe merge some stuff with text-print
-@app.route('/image-print', methods=['GET', 'POST'])
-def image_print():
-    if request.method == 'POST':
-        image = format_image_to_label(session["filepath"])
-        print_image(image)
-
-        if 'cut' in request.form:
-            print("printing and cutting")
-            cut_paper()
-            session["cut"] = True;
-        else:
-            print("printing")
-            session["cut"] = False;
-
-        return render_template('image.html', filename=session["filename"], cut=session["cut"])
-
-    return render_template('image.html', filename=session["filename"], cut=session["cut"])
-
-
 templates = {
     "DNH": {
         "text1": {
@@ -100,8 +46,78 @@ templates = {
     }
 }
 
+
+@app.route('/', methods=['GET', 'POST'])
+def base():
+    check_for_new_user(session)
+    return render_template('base.html')
+
+
+# gets triggered when the user_data folder for the user is created
+@new_user_handler
+def on_new_user(session):
+    print(Fore.BLUE + "new user with ID:", session["ID"], Style.RESET_ALL)
+
+    session["text image path"] = None
+    session["uploaded image path"] = None
+    session["cut"] = True
+    session["text1"] = templates["DNH"]["text1"]
+    session["text2"] = templates["DNH"]["text2"]
+    session["cut"] = templates["DNH"]["cut"]
+
+
+
+@app.route('/image', methods=['GET', 'POST'])
+def image():
+    check_for_new_user(session)
+
+    if request.method == 'POST':
+        if 'image' not in request.files:
+            return redirect(request.url)
+        file = request.files['image']
+
+        if file.filename == '':
+            return redirect(request.url)
+        if file:
+            extension = os.path.splitext(file.filename)[1]
+            session["uploaded image path"] = uploaded_image_filename+extension
+
+            filepath = get_file_path(session, session["uploaded image path"])
+            file.save(filepath)
+
+            format_image(filepath).save(filepath)
+            
+    return render_template('image.html', filename=session["uploaded image path"], cut=session["cut"])
+
+
+#TODO: maybe merge some stuff with text-print
+@app.route('/image-print', methods=['GET', 'POST'])
+def image_print():
+    check_for_new_user(session)
+
+    if session["uploaded image path"] == None:
+        print(Fore.YELLOW + "Warning, file doesn't exist" + Style.RESET_ALL)
+        return render_template('image.html', filename=session["uploaded image path"], cut=session["cut"])
+
+    if request.method == 'POST':
+        image = format_image_to_label(get_file_path(session, session["uploaded image path"]))
+        print_image(image)
+
+        if 'cut' in request.form:
+            print("printing and cutting")
+            cut_paper()
+            session["cut"] = True;
+        else:
+            print("printing")
+            session["cut"] = False;
+
+    return render_template('image.html', filename=session["uploaded image path"], cut=session["cut"])
+
+
 @app.route('/text-template', methods=['GET', 'POST'])
 def text_template():
+    check_for_new_user(session)
+
     if request.method == 'POST':
         template = templates[request.form["template"]]
         if request.form["template"] == "Food":
@@ -113,10 +129,11 @@ def text_template():
 
     return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
 
-    return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
 
 @app.route('/text-form', methods=['GET', 'POST'])
 def text_form():
+    check_for_new_user(session)
+
     if request.method == 'POST':
         session["text1"] = {
             "string": request.form["string1"],
@@ -130,28 +147,35 @@ def text_form():
         }
 
         img = gen_image(label_width, session["text1"], session["text2"])
-        filepath = os.path.join(app.config['TEXT_FOLDER'], "text.png")
-        img.save(filepath)
-        print(session)
 
-        return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
+        get_folder_path(session)
 
-    return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
+        session["text image path"] = generated_image_filename
+        img.save(get_file_path(session, session["text image path"]))
+        print()
+        print(session["text image path"])
 
+    return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
 
 
 @app.route('/text', methods=['GET', 'POST'])
 def text():
-    session["text1"] = templates["DNH"]["text1"]
+    check_for_new_user(session)
-    session["text2"] = templates["DNH"]["text2"]
+
-    session["cut"] = templates["DNH"]["cut"]
+    return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
-    return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
 
 
 @app.route('/text-print', methods=['GET', 'POST'])
 def text_print():
+    check_for_new_user(session)
+
     if request.method == 'POST':
-        image = format_image_to_label("static/text/text.png")
+        if session["text image path"] == None:
+            print(Fore.YELLOW + "Warning, file doesn't exist" + Style.RESET_ALL)
+            return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
+
+
+        image = format_image_to_label(get_file_path(session, session["text image path"]))
         print_image(image)
 
         if 'cut' in request.form:
@@ -162,19 +186,24 @@ def text_print():
             print("printing")
             session["cut"] = False;
 
-        return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
+    return render_template('text.html', filename=session["text image path"], text1=session["text1"], text2=session["text2"], cut=session["cut"])
 
-    return render_template('text.html', filename="text.png", text1=session["text1"], text2=session["text2"], cut=session["cut"])
+
+@app.route('/user_data/<filename>')
+def user_data(filename):
+    return send_from_directory(get_folder_path(session), filename)
 
 
 @app.route('/uploads/<filename>')
 def uploaded_file(filename):
     return redirect(url_for('static', filename='uploads/' + filename))
 
+
 @app.route('/text/<filename>')
 def generated_file(filename):
     return redirect(url_for('static', filename='text/' + filename))
 
+
 if __name__ == "__main__":
     app.run(debug=True)
 

file_handler.py

@@ -0,0 +1,76 @@
+import random
+import os
+import shutil
+import time
+
+user_data_lifetime_seconds = 2*60*60
+data_path = "user_data"
+users = dict([])
+
+if os.path.exists(data_path):
+    shutil.rmtree(data_path)
+
+def delete_old_users(session):
+    for ID in users.copy():
+        elapsed = time.time() - users[ID]["last accessed"]
+
+        if (elapsed > user_data_lifetime_seconds):
+            print(ID, "Hasn't accessed their files in", elapsed, "seconds, removing all user data")
+
+            shutil.rmtree(users[ID]["path"])
+            del users[ID]
+
+new_user_handler_func = None
+
+
+def new_user_handler(func):
+    global new_user_handler_func
+    new_user_handler_func = func
+    return func
+
+
+def new_user(session):
+    while(True):
+        ID = random.randint(0, 100000000)
+        if not ID in users:
+            break
+
+    users[ID] = {
+        "path": data_path + "/" + str(ID),
+        "last accessed": time.time()
+    }
+
+    session["ID"] = ID
+
+    os.makedirs(users[session["ID"]]["path"])
+
+    if new_user_handler_func:
+        new_user_handler_func(session)
+
+
+def get_file_path(session, filename):
+    return os.path.join(get_folder_path(session), filename)
+
+
+def file_exists(session, filename):
+    return os.path.exists(get_file_path(session, filename))
+
+
+def check_for_new_user(session):
+    if not "ID" in session:
+        new_user(session)
+    elif not session["ID"] in users:
+        new_user(session)
+
+    delete_old_users(session)
+
+
+def get_folder_path(session):
+    check_for_new_user(session)
+    ID = session["ID"]
+    user = users[ID]
+
+    user["last accessed"] = time.time()
+
+    return user["path"]
+

format_image.py

@@ -24,4 +24,4 @@ def format_image(path):
     return image
     
 
-format_image("static/uploads/upload.png").save("output.png")
+#format_image("static/uploads/upload.png").save("output.png")

templates/image.html

@@ -9,7 +9,7 @@
 
     {% if filename %}
     <br><br>
-    <img src="{{ url_for('uploaded_file', filename=filename) }}" alt="Uploaded Image">
+    <img src="user_data/{{filename}}" alt="Uploaded image">
 
     <form method="POST" action="/image-print">
         {% if cut %}

templates/text.html

@@ -33,7 +33,7 @@
 
     {% if filename %}
     <br><br>
-    <img src="{{ url_for('generated_file', filename=filename) }}" alt="Uploaded Image">
+    <img src="user_data/{{filename}}" alt="Generated Image">
 
     <form method="POST" action="/text-print">
         {% if cut %}