make crabrave compatible with docker

Dockerfile

@@ -6,6 +6,10 @@ COPY requirements.txt .
 
 RUN python3 -m pip install -r requirements.txt
 
+RUN apt update && apt install -y imagemagick
+
 COPY . .
 
+RUN mv /app/src/assets/misc/policy.xml /etc/ImageMagick-6/policy.xml
+
 CMD ["python3", "src/run.py"]

src/assets/misc/policy.xml

@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policymap [
+  <!ELEMENT policymap (policy)*>
+  <!ATTLIST policymap xmlns CDATA #FIXED ''>
+  <!ELEMENT policy EMPTY>
+  <!ATTLIST policy xmlns CDATA #FIXED '' domain NMTOKEN #REQUIRED
+    name NMTOKEN #IMPLIED pattern CDATA #IMPLIED rights NMTOKEN #IMPLIED
+    stealth NMTOKEN #IMPLIED value CDATA #IMPLIED>
+]>
+<!--
+  Configure ImageMagick policies.
+
+  Domains include system, delegate, coder, filter, path, or resource.
+
+  Rights include none, read, write, execute and all.  Use | to combine them,
+  for example: "read | write" to permit read from, or write to, a path.
+
+  Use a glob expression as a pattern.
+
+  Suppose we do not want users to process MPEG video images:
+
+    <policy domain="delegate" rights="none" pattern="mpeg:decode" />
+
+  Here we do not want users reading images from HTTP:
+
+    <policy domain="coder" rights="none" pattern="HTTP" />
+
+  The /repository file system is restricted to read only.  We use a glob
+  expression to match all paths that start with /repository:
+
+    <policy domain="path" rights="read" pattern="/repository/*" />
+
+  Lets prevent users from executing any image filters:
+
+    <policy domain="filter" rights="none" pattern="*" />
+
+  Any large image is cached to disk rather than memory:
+
+    <policy domain="resource" name="area" value="1GP"/>
+
+  Use the default system font unless overridden by the application:
+
+    <policy domain="system" name="font" value="/usr/share/fonts/favorite.ttf"/>
+
+  Define arguments for the memory, map, area, width, height and disk resources
+  with SI prefixes (.e.g 100MB).  In addition, resource policies are maximums
+  for each instance of ImageMagick (e.g. policy memory limit 1GB, -limit 2GB
+  exceeds policy maximum so memory limit is 1GB).
+
+  Rules are processed in order.  Here we want to restrict ImageMagick to only
+  read or write a small subset of proven web-safe image types:
+
+    <policy domain="delegate" rights="none" pattern="*" />
+    <policy domain="filter" rights="none" pattern="*" />
+    <policy domain="coder" rights="none" pattern="*" />
+    <policy domain="coder" rights="read|write" pattern="{GIF,JPEG,PNG,WEBP}" />
+-->
+<policymap>
+  <!-- <policy domain="resource" name="temporary-path" value="/tmp"/> -->
+  <!-- <policy domain="resource" name="memory" value="2GiB"/> -->
+  <!-- <policy domain="resource" name="map" value="4GiB"/> -->
+  <!-- <policy domain="resource" name="width" value="10KP"/> -->
+  <!-- <policy domain="resource" name="height" value="10KP"/> -->
+  <!-- <policy domain="resource" name="list-length" value="128"/> -->
+  <!-- <policy domain="resource" name="area" value="100MP"/> -->
+  <!-- <policy domain="resource" name="disk" value="16EiB"/> -->
+  <!-- <policy domain="resource" name="file" value="768"/> -->
+  <!-- <policy domain="resource" name="thread" value="4"/> -->
+  <!-- <policy domain="resource" name="throttle" value="0"/> -->
+  <!-- <policy domain="resource" name="time" value="3600"/> -->
+  <!-- <policy domain="coder" rights="none" pattern="MVG" /> -->
+  <!-- <policy domain="module" rights="none" pattern="{PS,PDF,XPS}" /> -->
+  <!-- <policy domain="delegate" rights="none" pattern="HTTPS" /> -->
+  <!-- <policy domain="path" rights="none" pattern="@*" /> -->
+  <!-- <policy domain="cache" name="memory-map" value="anonymous"/> -->
+  <!-- <policy domain="cache" name="synchronize" value="True"/> -->
+  <!-- <policy domain="cache" name="shared-secret" value="passphrase" stealth="true"/> -->
+  <!-- <policy domain="system" name="max-memory-request" value="256MiB"/> -->
+  <!-- <policy domain="cache" name="synchronize" value="true"/> -->
+  <!-- <policy domain="system" name="shred" value="1"/> -->
+  <!-- <policy domain="system" name="font" value="/path/to/unicode-font.ttf"/> -->
+  <policy domain="Undefined" rights="none"/>
+</policymap>