contrib: add gRPC gateway script for user/add with full chain TLS.

contrib/recipes/grpc_gateway/user_add.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+# Copyright 2018 The etcd Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+usage () {
+    echo 'Username required: ./user_add.sh $username'
+    exit
+}
+
+if [ "$1" == "" ]; then
+    usage
+fi
+
+newuser=$1
+read -r -s -p "Enter password for $newuser" newpass
+
+user=root
+pass=toor
+host=127.0.0.1
+port=2379
+api=v3
+
+cacert="path/to/ca.pem"
+key="path/to/client-key.pem"
+cert="path/to/client.pem"
+
+tokengen() {
+    json=$(printf '{"name": "%s", "password": "%s"}' \
+        "$(escape "$1")" \
+        "$(escape "$2")"
+    )
+    curl -s --cacert $cacert \
+        --key $key \
+        --cert $cert \
+        -X POST \
+        -d "$json" \
+        https://${host}:${port}/${api}/auth/authenticate \
+       | jq -r '.token'
+}
+
+add_user() {
+    json=$(printf '{"name": "%s", "password": "%s"}' \
+        "$(escape "$1")" \
+        "$(escape "$2")"
+    )
+    curl -s --cacert $cacert \
+        --key $key \
+        --cert $cert \
+        -H "Authorization: $3" \
+        -X POST \
+        -d "$json" \
+        https://${host}:${port}/${api}/auth/user/add
+}
+
+escape() {
+    echo "${1//\"/\\\"}"
+}
+
+token=$(tokengen $user $pass)
+response=$(add_user $newuser $newpass $token)
+
+echo -e "\\n$response"