First push from Satoshi Portal's own cyphernode

pycoin_docker/Dockerfile

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+#FROM resin/raspberry-pi-alpine-python:3.6
+FROM python:3.6-alpine
+
+ARG USER_ID
+ARG GROUP_ID
+ENV USERNAME proxyuser
+ENV HOME /${USERNAME}
+ENV USER_ID ${USER_ID:-1000}
+ENV GROUP_ID ${GROUP_ID:-1000}
+
+RUN addgroup -g ${GROUP_ID} ${USERNAME} \
+    && adduser -u ${USER_ID} -G ${USERNAME} -D -s /bin/sh -h ${HOME} ${USERNAME}
+
+RUN apk add --update --no-cache git jq \
+&& pip install --no-cache-dir pycoin \
+&& cd \
+&& git clone https://github.com/Kexkey/pycoin.git \
+&& cp -rf pycoin/pycoin/* /usr/local/lib/python3.6/site-packages/pycoin
+
+COPY --chown=proxyuser script/pycoin.sh ${HOME}/pycoin.sh
+COPY --chown=proxyuser script/requesthandler.sh ${HOME}/requesthandler.sh
+COPY --chown=proxyuser script/responsetoclient.sh ${HOME}/responsetoclient.sh
+COPY --chown=proxyuser script/startpycoin.sh ${HOME}/startpycoin.sh
+COPY --chown=proxyuser script/trace.sh ${HOME}/trace.sh
+
+USER ${USERNAME}
+WORKDIR ${HOME}
+
+RUN chmod +x startpycoin.sh requesthandler.sh
+
+ENTRYPOINT ["./startpycoin.sh"]

pycoin_docker/README.md

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+# Build image
+
+```shell
+docker build -t pycoinimg --build-arg USER_ID=$(id -u proxyuser) --build-arg GROUP_ID=$(id -g proxyuser) .
+```
+
+# Usefull examples
+
+See https://github.com/shivaenigma/pycoin
+
+List SegWit addresses for path 0/24-30 for a pub32:
+
+```shell
+curl -H "Content-Type: application/json" -d '{"pub32":"tpubD6NzVbkrYhZ4YR3QK2tyfMMvBghAvqtNaNK1LTyDWcRHLcMUm3ZN2cGm5BS3MhCRCeCkXQkTXXjiJgqxpqXK7PeUSp86DTTgkLpcjMtpKWk","path":"0/25-30"}' http://localhost:7777/derive
+curl -H "Content-Type: application/json" -d '{"pub32":"vpub5SLqN2bLY4WeZF3kL4VqiWF1itbf3A6oRrq9aPf16AZMVWYCuN9TxpAZwCzVgW94TNzZPNc9XAHD4As6pdnExBtCDGYRmNJrcJ4eV9hNqcv","path":"0/25-30"}' http://localhost:7777/derive
+```

pycoin_docker/env.properties

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+TRACING=1
+PYCOIN_LISTENING_PORT=7777

pycoin_docker/script/pycoin.sh

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+#!/bin/sh
+
+. ./trace.sh
+
+derive()
+{
+	trace "Entering derive()..."
+
+	local request=${1}
+	local pub32=$(echo "${request}" | jq ".pub32" | tr -d '"')
+	local path=$(echo "${request}" | jq ".path" | tr -d '"')
+
+	local result
+	local returncode
+	trace "[derive] path=${path}"
+	trace "[derive] pub32=${pub32}"
+
+	result=$(ku -n BTC -s ${path} -a E:${pub32})
+
+	returncode=$?
+	trace_rc ${returncode}
+	trace "[derive] result=${result}"
+
+	local notfirst=false
+
+	echo -n "{\"addresses\":["
+
+	local IFS=$'\n'
+	for address in ${result}
+	do
+		if ${notfirst}; then
+			echo ","
+		else
+			notfirst=true
+		fi
+		trace "[derive] address=${address}"
+
+		data="{\"address\":\"${address}\"}"
+		trace "[derive] data=${data}"
+
+		echo -n "${data}"
+	done
+
+	echo "]}"
+
+	return ${returncode}
+}

pycoin_docker/script/requesthandler.sh

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+#!/bin/sh
+#
+#
+#
+#
+
+. ./pycoin.sh
+. ./responsetoclient.sh
+. ./trace.sh
+
+main()
+{
+	trace "Entering main()..."
+
+	local step=0
+	local cmd
+	local http_method
+	local line
+	local content_length
+	local response
+	local returncode
+
+	while read line; do
+		line=$(echo "${line}" | tr -d '\r\n')
+		trace "[main] line=${line}"
+
+		if [ "${cmd}" = "" ]; then
+			# First line!
+			# Looking for something like:
+			# GET /cmd/params HTTP/1.1
+			# POST / HTTP/1.1
+			cmd=$(echo "${line}" | cut -d '/' -f2 | cut -d ' ' -f1)
+			trace "[main] cmd=${cmd}"
+			http_method=$(echo "${line}" | cut -d ' ' -f1)
+			trace "[main] http_method=${http_method}"
+			if [ "${http_method}" = "GET" ]; then
+				step=1
+			fi
+		fi
+		if [ "${line}" = "" ]; then
+			trace "[main] empty line"
+			if [ ${step} -eq 1 ]; then
+				trace "[main] body part finished, disconnecting"
+				break
+			else
+				trace "[main] headers part finished, body incoming"
+				step=1
+			fi
+		fi
+		# line=content-length: 406
+		case "${line}" in *[cC][oO][nN][tT][eE][nN][tT]-[lL][eE][nN][gG][tT][hH]*)
+			content_length=$(echo ${line} | cut -d ':' -f2)
+			trace "[main] content_length=${content_length}";
+			;;
+		esac
+		if [ ${step} -eq 1 ]; then
+			trace "[main] step=${step}"
+			if [ "${http_method}" = "POST" ]; then
+				read -n ${content_length} line
+				trace "[main] line=${line}"
+			fi
+			case "${cmd}" in
+				derive)
+					# POST http://192.168.111.152:7777/derive
+					# BODY {"pub32":"tpubD6NzVbkrYhZ4YR3QK2tyfMMvBghAvqtNaNK1LTyDWcRHLcMUm3ZN2cGm5BS3MhCRCeCkXQkTXXjiJgqxpqXK7PeUSp86DTTgkLpcjMtpKWk","path":"0/25-30"}
+					# BODY {"pub32":"upub5GtUcgGed1aGH4HKQ3vMYrsmLXwmHhS1AeX33ZvDgZiyvkGhNTvGd2TA5Lr4v239Fzjj4ZY48t6wTtXUy2yRgapf37QHgt6KWEZ6bgsCLpb","path":"0/25-30"}
+					# BODY {"pub32":"vpub5SLqN2bLY4WeZF3kL4VqiWF1itbf3A6oRrq9aPf16AZMVWYCuN9TxpAZwCzVgW94TNzZPNc9XAHD4As6pdnExBtCDGYRmNJrcJ4eV9hNqcv","path":"0/25-30"}
+
+					response=$(derive "${line}")
+					response_to_client "${response}" ${?}
+					break
+					;;
+			esac
+			break
+		fi
+	done
+	trace "[main] exiting"
+	return 0
+}
+
+export TRACING
+
+main
+exit $?

pycoin_docker/script/responsetoclient.sh

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+#!/bin/sh
+
+. ./trace.sh
+
+response_to_client()
+{
+	trace "Entering response_to_client()..."
+
+	local response=${1}
+	local returncode=${2}
+
+	([ -z "${returncode}" ] || [ "${returncode}" -eq "0" ]) && echo -ne "HTTP/1.1 200 OK\r\n"
+	[ -n "${returncode}" ] && [ "${returncode}" -ne "0" ] && echo -ne "HTTP/1.1 400 Bad Request\r\n"
+
+	echo -e "Content-Type: application/json\r\nContent-Length: ${#response}\r\n\r\n${response}"
+
+	# Small delay needed for the data to be processed correctly by peer
+	sleep 0.2s
+}
+
+case "${0}" in *responsetoclient.sh) response_to_client $@;; esac

pycoin_docker/script/startpycoin.sh

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+#!/bin/sh
+
+export TRACING
+export PYCOIN_LISTENING_PORT
+
+nc -vlkp${PYCOIN_LISTENING_PORT} -e ./requesthandler.sh

pycoin_docker/script/trace.sh

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+#!/bin/sh
+
+trace()
+{
+	if [ -n "${TRACING}" ]; then
+		echo "$(date -Is) ${1}" > /dev/stderr
+	fi
+}
+
+trace_rc()
+{
+	if [ -n "${TRACING}" ]; then
+		echo "$(date -Is) Last return code: ${1}" > /dev/stderr
+	fi
+}