From c5f170307da4015c2f078c31b0f4c5789ee0b5cf Mon Sep 17 00:00:00 2001
From: gabrielsoltz <thegaby@gmail.com>
Date: Tue, 11 Jun 2019 12:08:48 +0200
Subject: [PATCH] add linux and cygwin get_date_previous_than_months function

---
 include/os_detector | 92 +++++++++++++++++++++++++--------------------
 1 file changed, 52 insertions(+), 40 deletions(-)

diff --git a/include/os_detector b/include/os_detector
index 4acbec93..22efbc78 100644
--- a/include/os_detector
+++ b/include/os_detector
@@ -39,24 +39,30 @@ if [ "$OSTYPE" == "linux-gnu" ] || [ "$OSTYPE" == "linux-musl" ]; then
       base64 -d
     }
   how_many_days_from_today()
-      {
-        DATE_TO_COMPARE=$1
-        TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
-        DATE_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
-        DAYS_TO=$((( $DATE_IN_DAYS - $TODAY_IN_DAYS )/60/60/24))
-        echo $DAYS_TO
-      }
+    {
+      DATE_TO_COMPARE=$1
+      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
+      DATE_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
+      DAYS_TO=$((( $DATE_IN_DAYS - $TODAY_IN_DAYS )/60/60/24))
+      echo $DAYS_TO
+    }
+  get_date_previous_than_months()
+    {
+      MONTHS_TO_COMPARE=$1
+      DATE_BEFORE_MONTHS_TO_COMPARE=$(date --date="$(echo $MONTHS_TO_COMPARE) months ago" '+%Y-%m-%d')
+      echo $DATE_BEFORE_MONTHS_TO_COMPARE
+    }
 elif [[ "$OSTYPE" == "darwin"* ]]; then
   # BSD/OSX commands compatibility
   TEMP_REPORT_FILE=$(mktemp -t prowler.cred_report-XXXXXX)
   how_older_from_today()
-      {
-        DATE_TO_COMPARE=$1
-        TODAY_IN_DAYS=$(date +%s)
-        DATE_FROM_IN_DAYS=$(date -jf %Y-%m-%d $DATE_TO_COMPARE +%s)
-        DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
-        echo $DAYS_SINCE
-      }
+    {
+      DATE_TO_COMPARE=$1
+      TODAY_IN_DAYS=$(date +%s)
+      DATE_FROM_IN_DAYS=$(date -jf %Y-%m-%d $DATE_TO_COMPARE +%s)
+      DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
+      echo $DAYS_SINCE
+    }
   timestamp_to_date()
     {
       # remove fractions of a second
@@ -69,30 +75,30 @@ elif [[ "$OSTYPE" == "darwin"* ]]; then
       base64 -D
     }
   how_many_days_from_today()
-      {
-        DATE_TO_COMPARE=$1
-        TODAY_IN_DAYS=$(date +%s)
-        DATE_IN_DAYS=$(date -jf %Y-%m-%d $DATE_TO_COMPARE +%s)
-        DAYS_TO=$((( $DATE_IN_DAYS - $TODAY_IN_DAYS )/60/60/24))
-        echo $DAYS_TO
-      }
+    {
+      DATE_TO_COMPARE=$1
+      TODAY_IN_DAYS=$(date +%s)
+      DATE_IN_DAYS=$(date -jf %Y-%m-%d $DATE_TO_COMPARE +%s)
+      DAYS_TO=$((( $DATE_IN_DAYS - $TODAY_IN_DAYS )/60/60/24))
+      echo $DAYS_TO
+    }
   get_date_previous_than_months()
-      {
-        MONTHS_TO_COMPARE=$1
-        DATE_BEFORE_MONTHS_TO_COMPARE=$(date -v -$(echo $MONTHS_TO_COMPARE)m '+%Y-%m-%d')
-        echo $DATE_BEFORE_MONTHS_TO_COMPARE
-      }
+    {
+      MONTHS_TO_COMPARE=$1
+      DATE_BEFORE_MONTHS_TO_COMPARE=$(date -v -$(echo $MONTHS_TO_COMPARE)m '+%Y-%m-%d')
+      echo $DATE_BEFORE_MONTHS_TO_COMPARE
+    }
 elif [[ "$OSTYPE" == "cygwin" ]]; then
   # POSIX compatibility layer and Linux environment emulation for Windows
   TEMP_REPORT_FILE=$(mktemp -t -p /tmp prowler.cred_report-XXXXXX)
   how_older_from_today()
-      {
-        DATE_TO_COMPARE=$1
-        TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
-        DATE_FROM_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
-        DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
-        echo $DAYS_SINCE
-      }
+    {
+      DATE_TO_COMPARE=$1
+      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
+      DATE_FROM_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
+      DAYS_SINCE=$((($TODAY_IN_DAYS - $DATE_FROM_IN_DAYS )/60/60/24))
+      echo $DAYS_SINCE
+    }
   timestamp_to_date()
     {
       # remove fractions of a second
@@ -105,13 +111,19 @@ elif [[ "$OSTYPE" == "cygwin" ]]; then
       base64 -d
     }
   how_many_days_from_today()
-      {
-        DATE_TO_COMPARE=$1
-        TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
-        DATE_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
-        DAYS_TO=$((( $TODAY_IN_DAYS - $DATE_IN_DAYS )/60/60/24))
-        echo $DAYS_TO
-      }
+    {
+      DATE_TO_COMPARE=$1
+      TODAY_IN_DAYS=$(date -d "$(date +%Y-%m-%d)" +%s)
+      DATE_IN_DAYS=$(date -d $DATE_TO_COMPARE +%s)
+      DAYS_TO=$((( $TODAY_IN_DAYS - $DATE_IN_DAYS )/60/60/24))
+      echo $DAYS_TO
+    }
+  get_date_previous_than_months()
+    {
+      MONTHS_TO_COMPARE=$1
+      DATE_BEFORE_MONTHS_TO_COMPARE=$(date --date="$(echo $MONTHS_TO_COMPARE) months ago" '+%Y-%m-%d')
+      echo $DATE_BEFORE_MONTHS_TO_COMPARE
+    }
 else
       echo "Unknown Operating System! Valid \$OSTYPE: linux-gnu, linux-musl, darwin* or cygwin"
       echo "Found: $OSTYPE"