MFFolder_Compat.sh

#!/bin/bash

# Author: Hong Dai Thanh
# NOTE: This version of the script is written to be compatible with outdated systems.

function help() {
  echo -e \
       "Usage:\n" \
       "  $0 URL [--no-recurse] [-s]\n\n" \
       "    URL\n" \
       "      Link to Mediafire folder.\n" \
       "      e.g. www.mediafire.com/?sample or mediafire.com/?sample\n\n" \
       "    --no-recurse\n" \
       "      List only files under the current folder.\n" \
       "      Default option is to recursively list all files.\n\n" \
       "    -s, --silent\n" \
       "      Supress all error messages.\n" >&2;
}

RECURSE=true
LINK=
SILENT=false

# Parse arguments
for var in "$@"
do
  case "$var"
  in
    # Folder will be recursively downloaded by default
    # Disable with with --no-recurse option
    "--no-recurse")
      RECURSE=false
    ;;

    # Silent mode will suppress error messages
    "-s" | "--silent")
      SILENT=true
    ;;

    "-h" | "--help")
      help
      exit 0
    ;;

    -*)
      echo "$0: Unrecognized option: $var" >&2
      echo "$0: Type '$0 --help' for assistance" >&2
      exit 1
    ;;

    *)
      # Use the first string that is not starting with dash (-) as link
      if [[ -z "$LINK" ]]; then
        LINK=$var
      else
        echo "$0: Unrecognized extra token: $var" >&2
        echo "$0: Type '$0 --help' for assistance" >&2
        exit 1
      fi
    ;;
  esac
done

# echo "$0: $RECURSE $SILENT $LINK" >&2

# Check whether the link is provided
# Print out help if the link is not provided
[[ ! -z "$LINK" ]] || {
  help 
  exit 1
}

if $RECURSE;
then 
  RECURSE=yes
else
  RECURSE=no
fi

# Must check whether a link is provided first before supressing output
if $SILENT;
then
  exec 2> /dev/null
fi

# Test against Mediafire regular expression
MF_LINK_REGEX="^(http://)?(www\.)?mediafire\.com.*\?([a-z0-9]+)$"

# NOTE: Old grep doesn't have -q option
# egrep is used instead, since there is no option -E option for old grep
echo $LINK | egrep $MF_LINK_REGEX >/dev/null
[[ $? = "0" ]] || {
  echo "$0: Please provide a valid link to Mediafire." >&2
  exit 1
}

# Folder key
# NOTE: sed uses Basic Regular Expression
KEY=$(echo $LINK | sed 's/^.*?\([a-z0-9]*\)$/\1/')

# echo "$0: $KEY" >&2

# Download folder information
FOLDER_INFO_API="http://www.mediafire.com/api/folder/get_info.php?folder_key=$KEY&recursive=$RECURSE&response_format=xml"

# echo "$0: $FOLDER_INFO_API" >&2

echo "$0: Downloading folder information..." >&2

FOLDER_INFO=$(curl $FOLDER_INFO_API -s)

[[ $? = 0 ]] || {
  echo "$0: Error occurred while downloading." >&2
  exit 1
}

echo "$0: Folder information downloaded." >&2

# Check success or not
SUCCESS_STRING='<result>Success</result>'

echo $FOLDER_INFO | grep $SUCCESS_STRING >/dev/null
[[ $? = "0" ]] || {
  echo "$0: The Mediafire folder does not exist." >&2
  exit 1
}

# Extract quickkeys
# NOTE:
#   tr is used to tokenize into lines, since old version of sed is too slow when matching
# regular expression with global option on long lines.
#   -o option is not available in old grep.
QUICKKEYS=$(echo $FOLDER_INFO | tr '/' '\n' | grep "<quickkey>" | sed 's/.*<quickkey>\([a-z0-9]*\)</\1/')

for var in $QUICKKEYS
do
  echo "http://www.mediafire.com/?$var"
done