Adding a script to help with ldap config issues (mattermost#7995)

* Adding a script to help with ldap config

* Fixing help text

* Fixing typo

scripts/ldap-check.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+jq_cmd=jq
+[[ $(type -P "$jq_cmd") ]] || { 
+	echo "'$jq_cmd' command line JSON processor not found";
+	echo "Please install on linux with 'sudo apt-get install jq'"
+	echo "Please install on mac with 'brew install jq'"
+	exit 1; 
+}
+
+ldapsearch_cmd=ldapsearch
+[[ $(type -P "$ldapsearch_cmd") ]] || { 
+	echo "'$ldapsearch_cmd' shell accessible interface to ldap not found";
+	echo "Please install on linux with 'sudo apt-get install ldap-utils'"
+	exit 1; 
+}
+
+if [[ -z ${1} ]]; then
+	echo "We could not find a username";
+	echo "usage: ./ldap-check.sh [username]"
+	echo "example: ./ldap-check.sh john"
+	exit 1;
+fi
+
+echo "Looking for config.json"
+
+config_file=
+if [[ -e "./config.json" ]]; then
+	config_file="./config.json"
+	echo "Found config at $config_file";
+fi
+
+if [[ -z ${config_file} && -e "./config/config.json" ]]; then
+	config_file="./config/config.json"
+	echo "Found config at $config_file";
+fi
+
+if [[ -z ${config_file} && -e "../config/config.json" ]]; then
+	config_file="../config/config.json"
+	echo "Found config at $config_file";
+fi
+
+if [[ -z ${config_file} ]]; then
+	echo "We could not find config.json";
+	exit 1;
+fi
+
+LdapServer=`cat $config_file | jq -r .LdapSettings.LdapServer`
+LdapPort=`cat $config_file | jq -r .LdapSettings.LdapPort`
+BindUsername=`cat $config_file | jq -r .LdapSettings.BindUsername`
+BindPassword=`cat $config_file | jq -r .LdapSettings.BindPassword`
+BaseDN=`cat $config_file | jq -r .LdapSettings.BaseDN`
+UserFilter=`cat $config_file | jq -r .LdapSettings.UserFilter`
+EmailAttribute=`cat $config_file | jq -r .LdapSettings.EmailAttribute`
+UsernameAttribute=`cat $config_file | jq -r .LdapSettings.UsernameAttribute`
+IdAttribute=`cat $config_file | jq -r .LdapSettings.IdAttribute`
+
+if [[ -z ${UserFilter} ]]; then
+	UserFilter="($IdAttribute=$1)"
+else
+	UserFilter="(&($IdAttribute=$1)$UserFilter)"
+fi
+
+cmd_to_run="$ldapsearch_cmd -LLL -x -h $LdapServer -p $LdapPort -D \"$BindUsername\" -w \"$BindPassword\" -b \"$BaseDN\" \"$UserFilter\" $IdAttribute $UsernameAttribute $EmailAttribute"
+echo $cmd_to_run
+echo "-------------------------"
+eval $cmd_to_run