Dockerfile

FROM ubuntu:focal

# specify wanted synapse version here or override by passing --build-arg
ARG SYNAPSE_VERSION=1.33.2+focal1

# non-interactive mode for building the image
ARG DEBIAN_FRONTEND=noninteractive

# update first
RUN apt-get update && apt-get upgrade -y

# install some basic dependencies
RUN apt-get install curl apt-transport-https software-properties-common -y

# add matrix repo key
RUN curl -s \
	-o /usr/share/keyrings/matrix-org-archive-keyring.gpg \
	https://packages.matrix.org/debian/matrix-org-archive-keyring.gpg

# add matrix repo
RUN echo "deb [signed-by=/usr/share/keyrings/matrix-org-archive-keyring.gpg] https://packages.matrix.org/debian/ $(lsb_release -cs) main" \
	| tee /etc/apt/sources.list.d/matrix-org.list

# update repos and install synapse
RUN apt-get update \
	&& apt-get install matrix-synapse-py3=${SYNAPSE_VERSION} libpq-dev python3-pip -y \
	&& pip3 install psycopg2

# add patched kamax-io/matrix-synapse-rest-auth to enable custom authentication backends
# make sure this is the right python version
ADD files/rest_auth_provider.py /opt/venvs/matrix-synapse/lib/python3.8/site-packages/rest_auth_provider.py

# config and keys
VOLUME [ "/etc/custom-matrix" ]
# upload data and logs
VOLUME [ "/data/media_store", "/data/uploads", "/data/logs" ]

# federation (s2s)
EXPOSE 8448
# client (c2s)
EXPOSE 8008

# run synapse in foreground mode
CMD ["/opt/venvs/matrix-synapse/bin/python", "-B", "-m", "synapse.app.homeserver", "-c", "/etc/custom-matrix/homeserver.yaml"]