initial

code/Dockerfile

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+FROM python:3
+COPY requirements.txt /requirements.txt
+RUN pip3 install --upgrade pip
+RUN pip3 install -r /requirements.txt
+COPY . /code/
+WORKDIR /code
+CMD ./start.me

code/labeler.py

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+import time
+import datetime
+import os
+import re
+import json
+import logging
+from flask import (
+    Flask,
+    request,
+    session,
+    g,
+    redirect,
+    url_for,
+    abort,
+    render_template,
+    flash,
+)
+from revprox import ReverseProxied
+
+# configuration
+IMAGEDIR = "/data/images/"
+LABELDIR = "/data/labels/"
+CONFIG_FILE = "/data/config.json"
+DEBUG = False
+SECRET_KEY = os.environ.get("SECRETKEY", "development key")
+for d in (IMAGEDIR, LABELDIR):
+    try:
+        os.makedirs(d)
+    except FileExistsError:
+        pass
+
+app = Flask(__name__)
+app.config.from_object(__name__)
+app.wsgi_app = ReverseProxied(app.wsgi_app)
+
+
+@app.before_request
+def before_request_func():
+    try:
+        with open(app.config["CONFIG_FILE"], "rt") as fp:
+            g.config = json.load(fp)
+            g.labels = g.config["labels"]
+    except Exception as e:
+        logging.warning(e)
+        logging.warning("config.json could not be read. using defaults.")
+        g.labels = [
+            {"type": "checkbox", "name": "my_check", "default": "off"},
+            {"type": "text", "name": "my_text", "default": "1.0"},
+            {
+                "type": "range",
+                "name": "my_slider",
+                "default": "75",
+                "min": "0",
+                "max": "100",
+            },
+        ]
+        g.config = {"title": "Labeler", "labels": g.labels}
+
+    for label in g.labels:
+        label['value'] = label['default']
+
+def natural_key(string_):
+    """See http://www.codinghorror.com/blog/archives/001018.html"""
+    return [int(s) if s.isdigit() else s for s in re.split(r"(\d+)", string_)]
+
+
+def get_metadata_path(image_path):
+    base, ext = os.path.splitext(os.path.basename(image_path))
+    jsonpath = os.path.join(app.config["LABELDIR"], base + ".json")
+    return jsonpath
+
+
+def get_current_image(images):
+    for i, f in enumerate(images):
+        jsonpath = get_metadata_path(f)
+        if not os.path.exists(jsonpath):
+            return i
+    return i
+
+
+def get_image_list():
+    return sorted(
+        [
+            os.path.join(app.config["IMAGEDIR"], x)
+            for x in os.listdir(app.config["IMAGEDIR"])
+            if not x.endswith("json")
+        ],
+        key=natural_key,
+    )
+
+
+def get_metadata(imagepath):
+    try:
+        with open(get_metadata_path(imagepath), "rt") as fp:
+            values = json.load(fp)
+            metadata = [x.copy() for x in g.labels.copy()]
+            for label in metadata:
+                if label["name"] in values:
+                    label["value"] = values[label["name"]]
+                else:
+                    label["value"] = label["default"]
+
+            return metadata
+    except FileNotFoundError:
+        # Return defaults
+        return g.labels
+    except Exception as e:
+        logging.error(e)
+        # Return defaults
+        return g.labels
+
+
+def set_metadata(values, imagepath):
+
+    metadata = [x.copy() for x in g.labels.copy()]
+    for label in metadata:
+        if not label["name"] in values:
+            values[label["name"]] = label["default"]
+
+    # logging.warning((path, values))
+    if not os.path.exists(
+        os.path.join(app.config["IMAGEDIR"], os.path.basename(imagepath))
+    ):
+        return
+    with open(get_metadata_path(imagepath), "wt") as fp:
+        return json.dump(values, fp, indent=2, sort_keys=True)
+
+
+@app.route("/", methods=["GET", "POST"])
+@app.route("/image:<int:id>", methods=["GET", "POST"])
+def show_image(id=None):
+
+    if request.method == "POST":
+        # parse form
+        image_name = request.form["image_name"]
+        metadata = {}
+        for key in request.form:
+            if key.startswith("label_"):
+                dictkey = key[6:]
+                metadata[dictkey] = str(request.form[key])
+        set_metadata(metadata, image_name)
+
+    images = get_image_list()
+    if id == None:
+        id = get_current_image(images)
+    else:
+        id = max(0, min(len(images) - 1, int(id)))
+    labels = get_metadata(images[id])
+    id_minus = max(0, min(len(images) - 1, int(id - 1)))
+    id_plus = max(0, min(len(images) - 1, int(id + 1)))
+    return render_template(
+        "show_image.html",
+        id=id,
+        count=len(images),
+        image=images[id],
+        image_name=os.path.basename(images[id]),
+        image_plus=images[id_plus],
+        labels=labels,
+        id_minus=id_minus,
+        id_plus=id_plus,
+        title=g.config.get("title", "Labeler"),
+    )

code/requirements.txt

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+flask
+gunicorn

code/revprox.py

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+class ReverseProxied(object):
+    '''Wrap the application in this middleware and configure the 
+    front-end server to add these headers, to let you quietly bind 
+    this to a URL other than / and to an HTTP scheme that is 
+    different than what is used locally.
+
+    In nginx:
+    location /myprefix {
+        proxy_pass http://192.168.0.1:5001;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Scheme $scheme;
+        proxy_set_header X-Script-Name /myprefix;
+        }
+
+    :param app: the WSGI application
+    '''
+    def __init__(self, app):
+        self.app = app
+
+    def __call__(self, environ, start_response):
+        script_name = environ.get('HTTP_X_SCRIPT_NAME', '')
+        if script_name:
+            environ['SCRIPT_NAME'] = script_name
+            path_info = environ['PATH_INFO']
+            if path_info.startswith(script_name):
+                environ['PATH_INFO'] = path_info[len(script_name):]
+
+        scheme = environ.get('HTTP_X_SCHEME', '')
+        if scheme:
+            environ['wsgi.url_scheme'] = scheme
+        return self.app(environ, start_response)

code/start.me

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+#!/bin/bash
+
+
+useradd --no-create-home -u $UID user
+
+exec runuser user -m -c 'gunicorn -b 0.0.0.0:8080 -w 4 labeler:app'

code/static/data

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+/data

code/static/script.js

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+
+

code/static/style.css

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+body            { font-family: sans-serif; background: #888; margin: 0px;
+                  min-height: 100vh; width: 100vw; overflow-x: hidden; }
+a, h1, h2       { color: #377ba8; }
+h1, h2          { font-family: 'Georgia', serif; margin: 0; }
+h1              { border-bottom: 2px solid #eee; }
+h2              { font-size: 1.2em; }
+
+tr,td,tbody             { margin: 0px; }
+
+.page           { margin: 0em;
+                  padding: 0em; background: #888; min-height: 100vh; width: 100vw;}
+.entries        { list-style: none; margin: 0; padding: 0; width:100%; min-height: 95vh; }
+
+.large          { font-size: 3em; }
+.right          { text-align: right; }
+.center          { text-align: center; }
+
+#image          { position: absolute;
+                  left:0px; top:0px;
+                  width: calc(100vw - 220px); /*height:95vh;*/ }
+#img            { max-width: calc(100vw - 220px); max-height:95vh;
+                  width: auto; height: auto;
+                  display: block; margin-left: auto;
+                  margin-right: auto; }
+
+#img_title      { overflow-x: hidden;
+                  overflow-wrap: anywhere;
+}
+
+#topright       { position: absolute;
+                  right:0px; top:0px;
+                  /*width: 20vw;*/
+                  height:95vh;
+                  font-size: large; }
+.inputcontainer {
+    z-index:1;
+    background-color: #aaa;
+    padding: 5px;
+    margin-bottom: 3px;
+    border-radius: 5px;
+    width: 210px;
+}
+
+
+input, select           {
+                  width: 180px;
+                  font-size: large;
+                }
+
+
+input[type="text"] {
+
+}
+input[type="submit"] {
+
+}
+input[type="checkbox"] {
+    width: 3em;
+    height: 1.5em;
+}
+label { display: block; }
+output { display: block; font-weight: bold; }
+
+.button_next {
+  width: 2em;
+  height: 3em;
+  font-size: large;
+  margin-top: 1em;
+}
+.float_left {
+    float: left;
+}
+.float_right {
+    float:right;
+}
+.button_save {
+  height: 3em;
+  margin-top: 1em;
+  margin-left: 1em;
+  margin-right: 1em;
+  clear: both;
+}
+.button_continue {
+  height: 4em;
+  margin-top: 3em;
+  margin-left: auto;
+  margin-right: auto;
+  width: 6em;
+}
+
+.preload {
+  position: absolute;
+  left: 0px;
+  bottom: 0px;
+  width: 1px;
+  height: 1px;
+  overflow: hidden;
+}

code/templates/layout.html

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+<!doctype html>
+<head>
+<title>{{ title }}</title>
+<link rel=stylesheet type=text/css href="{{ url_for('static', filename='style.css') }}">
+<meta name="viewport" content="width=440" />
+<script language="javascript" src="{{ url_for('static', filename='script.js') }}"  ></script>
+
+</head>
+<body>
+<div class=page>
+
+  {% block body %}{% endblock %}
+</div>
+</body>

code/templates/show_image.html

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+{% extends "layout.html" %}
+{% block body %}
+<div class="entries">
+    <div id="image">
+      <img id="img"  src="{{ url_for('static', filename=image) }}" >
+      <div class=center id="img_title" >{{ image_name }} ({{id+1}}/{{count}})</div>
+    </div>
+
+    <div id="topright">
+         <form action="{{ url_for('show_image', id = id_plus) }}" method=post class=add-entry>
+            <input type=hidden value="{{ image_name }}" name=image_name>
+              {% for label in labels %}
+                <div class=inputcontainer>
+                    <label>{{ label.name }}:</label>
+                    <div class=center>
+                    {% if label.type == "checkbox" %}
+                        <input class=center type="checkbox" name="label_{{ label.name }}" {% if label.value == "on" %}checked{% endif %}>
+                    {% endif %}
+                    {% if label.type == "text" %}
+                        <input type="text" name="label_{{ label.name }}" value="{{ label.value }}">
+                    {% endif %}
+                    {% if label.type == "number" %}
+                        <input type="number" step="any" name="label_{{ label.name }}" value="{{ label.value }}">
+                    {% endif %}
+                    {% if label.type == "range" %}
+                        <input type="range" name="label_{{ label.name }}" value="{{ label.value }}" min="{{ label.min }}" max="{{ label.max }}" oninput="this.nextElementSibling.value = this.value">
+                        <output>{{label.value}}</output>
+                    {% endif %}
+                    {% if label.type == "select" %}
+                        <select name="label_{{ label.name }}">
+                        {% for opt in label.options %}
+                            <option value="{{opt}}" {% if opt == label.value %}SELECTED{% endif %}>{{opt}}</option>
+                        {% endfor %}
+                        </select>
+                    {% endif %}
+                    </div>
+                </div>
+              {% endfor %}
+            <div class=center>
+                <input type=submit value="save" name=save class="button_save">
+            </div>
+         </form>
+        <div class=center>
+            <button class="button_next float_left" onclick="location.href='{{ url_for('show_image', id = id_minus) }}';">&larr;</button>
+            <button class="button_next float_right" onclick="location.href='{{ url_for('show_image', id = id_plus) }}';">&rarr;</button>
+            <button class="button_continue" onclick="location.href='{{ url_for('show_image') }}';">continue</button>
+        </div>
+
+    </div>
+</div>
+
+<img class=preload src="{{ url_for('static', filename=image_plus) }}" >
+{% endblock %}