Dockerize backend server (#8)

Dockerize backend server

Co-authored-by: Leo <legacyofleo@gmail.com>

.gitignore

@@ -3,3 +3,4 @@
 build/
 server/config.js
 server/package-lock.json
+server/docker-compose.yml

server/README.md

@@ -63,3 +63,28 @@ fields:
 - `author` (string): Optional author name to add to the annotation metadata.
 - `modified` (number): Optional timestamp (seconds since the epoch, in UTC)
   when the annotation was last modified.
+
+# Run pdfdraw server in a docker container using docker-compose.
+
+All settings are exposed into enviroment variables. That means you are able to config the backend server in [docker-compose.yml](docker-compose.yml.in) yaml file by editing the corresponding enviroment variables.
+
+Save `docker-compose.yml.in` to `docker-compose.yml` and make changes if needed.
+Based on your docker setup you still need to edit a few lines in the `docker-compose.yml` file for networking. 
+
+For example by exposing ports:
+
+    ports:  
+      - "8080:8080"
+ 
+or join an existing network:
+
+    networks:  
+      default:
+        external:
+           name: my-pre-existing-network
+
+For more details read [Networking in Compose](https://docs.docker.com/compose/networking/)
+
+Than run docker compose.
+
+    docker-compose up -d

server/docker-compose.yml.in

@@ -0,0 +1,22 @@
+version: '2'
+services:
+  pdfdraw-server:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile
+
+    environment:
+      port: 8080
+      secret: 'the-shared-secret'
+      #allow_invalid_certificates: null
+      #use_auto_ecdh_curve: null
+      #cmd_pdftk: ''
+      #cmd_svg2pdf: ''
+
+    #ports:  
+    #- '8080:8080'
+
+#networks:  
+#  default:
+#    external:
+#      name: my-pre-existing-network

server/docker/Dockerfile

@@ -0,0 +1,13 @@
+FROM nikolaik/python-nodejs:python3.9-nodejs15
+
+ADD . /app
+ADD docker/config.js.docker /app/config.js
+
+RUN apt-get update || : && apt-get install pdftk python-pypdf2 -y
+
+WORKDIR /app
+
+RUN pip install svglib
+RUN npm install 
+
+CMD ["node", "server.js"]

server/docker/config.js.docker

@@ -0,0 +1,24 @@
+var config = {};
+
+// The port the service should run on.
+config.port = process.env.port || 8080;
+
+// The shared secret for token validation. Must be the same value
+// as configured in the Nextcloud admin interface.
+config.secret = process.env.secret || 'the-shared-secret';
+
+// INSECURE! Allow any self-signed / expired certificates.
+// Only use this during development!
+config.allow_invalid_certificates = process.env.allow_invalid_certificates || false;
+
+// Required for newer versions of node / libssl.
+// See https://github.com/nodejs/node/issues/21513#issuecomment-399790415
+config.use_auto_ecdh_curve = process.env.use_auto_ecdh_curve || false;
+
+// Command to use when running pdftk. Defaults to 'pdftk' if not configured.
+config.cmd_pdftk = process.env.cmd_pdftk || '';
+
+// Command to use when running svg2pdf. Defaults to 'svg2pdf' if not configured.
+config.cmd_svg2pdf = process.env.cmd_svg2pdf || '';
+
+module.exports = config;