yahoo

#!/bin/bash

if [ $# -ne 3 ]; then
    echo "incorrect number of arguments."
    echo "usage: $0 <from_date> <to_date> <symbol>"
    exit 1
fi

# PARSE FROM DATE AND TO DATE
today=$(date -j -f "%H:%M:%S" "00:00:00" "+%s")

from=$(date -j -f "%Y-%m-%d %H:%M:%S" "$1 00:00:00" "+%s" 2>/dev/null)
if [ $? -ne 0 ]; then
    echo "failed to parse date format: $1: please use %Y-%m-%d."
    echo "usage: $0 <from_date> <to_date> <symbol>"
    exit 1
fi
if [ $from -ge $today ]; then
    echo "from date must be in the past: $1 is in the future"
    echo "usage: $0 <from_date> <to_date> <symbol>"
    exit 1
fi

to=$(date -j -f "%Y-%m-%d %H:%M:%S" "$2 00:00:00" "+%s" 2>/dev/null)
if [ $? -ne 0 ]; then
    echo "failed to parse date format: $2: please use %Y-%m-%d."
    echo "usage: $0 <from_date> <to_date> <symbol>"
    exit 1
fi
if [ $to -lt $from ]; then
    echo "to date must after from date: $2 is before $1"
    echo "usage: $0 <from_date> <to_date> <symbol>"
    exit 1
fi
if [ $to -ge $today ]; then
    echo "to date must be before today: $2 is in the future"
    echo "usage: $0 <from_date> <to_date> <symbol>"
    exit 1
fi

# CHECK RESPONSE CODE
code=$(curl -G -s -o /dev/null -w "%{http_code}" \
"https://query1.finance.yahoo.com/v7/finance/download/$3" \
-d "period1=$from" \
-d "period2=$to" \
-d "interval=1d" \
-d "events=history" \
-d "includeAdjustedClose=true")

if [[ ! $code =~ 2[0-9]{2} ]]; then
    echo "yahoo returned a failed response code: $code, check symbol and retry"
    echo "usage: $0 <from_date> <to_date> <symbol>"
    exit 1
fi

# MAKE DATA DIRECTORY
if [ ! -d $2 ]; then mkdir $2; fi

# MAKE DATA REQUEST
curl -G -o "$2/$3" \
"https://query1.finance.yahoo.com/v7/finance/download/$3" \
-d "period1=$from" \
-d "period2=$to" \
-d "interval=1d" \
-d "events=history" \
-d "includeAdjustedClose=true"