编写shell脚本将VPS上的数据备份到Dropbox网盘的方法

#!/usr/bin/env bash
#
# Dropbox Uploader
#
# Copyright (C) 2010-2014 Andrea Fabrizi <andrea.fabrizi@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#

#Default configuration file
CONFIG_FILE=~/.dropbox_uploader

#Default chunk size in Mb for the upload process
#It is recommended to increase this value only if you have enough free space on your /tmp partition
#Lower values may increase the number of http requests
CHUNK_SIZE=4

#Curl location
#If not set, curl will be searched into the $PATH
#CURL_BIN="/usr/bin/curl"

#Default values
TMP_DIR="/tmp"
DEBUG=0
QUIET=0
SHOW_PROGRESSBAR=0
SKIP_EXISTING_FILES=0
ERROR_STATUS=0

#Don't edit these...
API_REQUEST_TOKEN_URL="https://api.dropbox.com/1/oauth/request_token"
API_USER_AUTH_URL="https://www2.dropbox.com/1/oauth/authorize"
API_ACCESS_TOKEN_URL="https://api.dropbox.com/1/oauth/access_token"
API_CHUNKED_UPLOAD_URL="https://api-content.dropbox.com/1/chunked_upload"
API_CHUNKED_UPLOAD_COMMIT_URL="https://api-content.dropbox.com/1/commit_chunked_upload"
API_UPLOAD_URL="https://api-content.dropbox.com/1/files_put"
API_DOWNLOAD_URL="https://api-content.dropbox.com/1/files"
API_DELETE_URL="https://api.dropbox.com/1/fileops/delete"
API_MOVE_URL="https://api.dropbox.com/1/fileops/move"
API_COPY_URL="https://api.dropbox.com/1/fileops/copy"
API_METADATA_URL="https://api.dropbox.com/1/metadata"
API_INFO_URL="https://api.dropbox.com/1/account/info"
API_MKDIR_URL="https://api.dropbox.com/1/fileops/create_folder"
API_SHARES_URL="https://api.dropbox.com/1/shares"
APP_CREATE_URL="https://www2.dropbox.com/developers/apps"
RESPONSE_FILE="$TMP_DIR/du_resp_$RANDOM"
CHUNK_FILE="$TMP_DIR/du_chunk_$RANDOM"
TEMP_FILE="$TMP_DIR/du_tmp_$RANDOM"
BIN_DEPS="sed basename date grep stat dd mkdir"
VERSION="0.14"

umask 077

#Check the shell
if [ -z "$BASH_VERSION" ]; then
  echo -e "Error: this script requires the BASH shell!"
  exit 1
fi

shopt -s nullglob #Bash allows filename patterns which match no files to expand to a null string, rather than themselves
shopt -s dotglob #Bash includes filenames beginning with a "." in the results of filename expansion

#Look for optional config file parameter
while getopts ":qpskdf:" opt; do
  case $opt in

  f)
   CONFIG_FILE=$OPTARG
  ;;

  d)
   DEBUG=1
  ;;

  q)
   QUIET=1
  ;;

  p)
   SHOW_PROGRESSBAR=1
  ;;

  k)
   CURL_ACCEPT_CERTIFICATES="-k"
  ;;

  s)
   SKIP_EXISTING_FILES=1
  ;;

  \?)
   echo "Invalid option: -$OPTARG" >&2
   exit 1
  ;;

  :)
   echo "Option -$OPTARG requires an argument." >&2
   exit 1
  ;;

 esac
done

if [[ $DEBUG != 0 ]]; then
  echo $VERSION
  set -x
  RESPONSE_FILE="$TMP_DIR/du_resp_debug"
fi

if [[ $CURL_BIN == "" ]]; then
  BIN_DEPS="$BIN_DEPS curl"
  CURL_BIN="curl"
fi

#Dependencies check
which $BIN_DEPS > /dev/null
if [[ $? != 0 ]]; then
  for i in $BIN_DEPS; do
    which $i > /dev/null ||
      NOT_FOUND="$i $NOT_FOUND"
  done
  echo -e "Error: Required program could not be found: $NOT_FOUND"
  exit 1
fi

#Check if readlink is installed and supports the -m option
#It's not necessary, so no problem if it's not installed
which readlink > /dev/null
if [[ $? == 0 && $(readlink -m "//test" 2> /dev/null) == "/test" ]]; then
  HAVE_READLINK=1
else
  HAVE_READLINK=0
fi

#Forcing to use the builtin printf, if it's present, because it's better
#otherwise the external printf program will be used
#Note that the external printf command can cause character encoding issues!
builtin printf "" 2> /dev/null
if [[ $? == 0 ]]; then
  PRINTF="builtin printf"
  PRINTF_OPT="-v o"
else
  PRINTF=$(which printf)
  if [[ $? != 0 ]]; then
    echo -e "Error: Required program could not be found: printf"
  fi
  PRINTF_OPT=""
fi

#Print the message based on $QUIET variable
function print
{
  if [[ $QUIET == 0 ]]; then
	  echo -ne "$1";
  fi
}

#Returns unix timestamp
function utime
{
  echo $(date +%s)
}

#Remove temporary files
function remove_temp_files
{
  if [[ $DEBUG == 0 ]]; then
    rm -fr "$RESPONSE_FILE"
    rm -fr "$CHUNK_FILE"
    rm -fr "$TEMP_FILE"
  fi
}

#Returns the file size in bytes
# generic GNU Linux: linux-gnu
# windows cygwin:  cygwin
# raspberry pi:   linux-gnueabihf
# macosx:      darwin10.0
# freebsd:      FreeBSD
# qnap:       linux-gnueabi
# iOS:        darwin9
function file_size
{
  #Some embedded linux devices
  if [[ $OSTYPE == "linux-gnueabi" || $OSTYPE == "linux-gnu" ]]; then
    stat -c "%s" "$1"
    return

  #Generic Unix
  elif [[ ${OSTYPE:0:5} == "linux" || $OSTYPE == "cygwin" || ${OSTYPE:0:7} == "solaris" ]]; then
    stat --format="%s" "$1"
    return

  #BSD, OSX and other OSs
  else
    stat -f "%z" "$1"
    return
  fi
}

#Usage
function usage
{
  echo -e "Dropbox Uploader v$VERSION"
  echo -e "Andrea Fabrizi - andrea.fabrizi@gmail.com\n"
  echo -e "Usage: $0 COMMAND [PARAMETERS]..."
  echo -e "\nCommands:"

  echo -e "\t upload  <LOCAL_FILE/DIR ...> <REMOTE_FILE/DIR>"
  echo -e "\t download <REMOTE_FILE/DIR> [LOCAL_FILE/DIR]"
  echo -e "\t delete  <REMOTE_FILE/DIR>"
  echo -e "\t move   <REMOTE_FILE/DIR> <REMOTE_FILE/DIR>"
  echo -e "\t copy   <REMOTE_FILE/DIR> <REMOTE_FILE/DIR>"
  echo -e "\t mkdir  <REMOTE_DIR>"
  echo -e "\t list   [REMOTE_DIR]"
  echo -e "\t share  <REMOTE_FILE>"
  echo -e "\t info"
  echo -e "\t unlink"

  echo -e "\nOptional parameters:"
  echo -e "\t-f <FILENAME> Load the configuration file from a specific file"
  echo -e "\t-s      Skip already existing files when download/upload. Default: Overwrite"
  echo -e "\t-d      Enable DEBUG mode"
  echo -e "\t-q      Quiet mode. Don't show messages"
  echo -e "\t-p      Show cURL progress meter"
  echo -e "\t-k      Doesn't check for SSL certificates (insecure)"

  echo -en "\nFor more info and examples, please see the README file.\n\n"
  remove_temp_files
  exit 1
}

#Check the curl exit code
function check_http_response
{
  CODE=$?

  #Checking curl exit code
  case $CODE in

    #OK
    0)

    ;;

    #Proxy error
    5)
      print "\nError: Couldn't resolve proxy. The given proxy host could not be resolved.\n"

      remove_temp_files
      exit 1
    ;;

    #Missing CA certificates
    60|58)
      print "\nError: cURL is not able to performs peer SSL certificate verification.\n"
      print "Please, install the default ca-certificates bundle.\n"
      print "To do this in a Debian/Ubuntu based system, try:\n"
      print " sudo apt-get install ca-certificates\n\n"
      print "If the problem persists, try to use the -k option (insecure).\n"

      remove_temp_files
      exit 1
    ;;

    6)
      print "\nError: Couldn't resolve host.\n"

      remove_temp_files
      exit 1
    ;;

    7)
      print "\nError: Couldn't connect to host.\n"

      remove_temp_files
      exit 1
    ;;

  esac

  #Checking response file for generic errors
  if grep -q "HTTP/1.1 400" "$RESPONSE_FILE"; then
    ERROR_MSG=$(sed -n -e 's/{"error": "\([^"]*\)"}/\1/p' "$RESPONSE_FILE")

    case $ERROR_MSG in
       *access?attempt?failed?because?this?app?is?not?configured?to?have*)
        echo -e "\nError: The Permission type/Access level configured doesn't match the DropBox App settings!\nPlease run \"$0 unlink\" and try again."
        exit 1
      ;;
    esac

  fi

}

#Urlencode
function urlencode
{
  local string="${1}"
  local strlen=${#string}
  local encoded=""

  for (( pos=0 ; pos<strlen ; pos++ )); do
    c=${string:$pos:1}
    case "$c" in
      [-_.~a-zA-Z0-9] ) o="${c}" ;;
      * ) $PRINTF $PRINTF_OPT '%%%02x' "'$c"
    esac
    encoded+="${o}"
  done

  echo "$encoded"
}

function normalize_path
{
  path=$(echo -e "$1")
  if [[ $HAVE_READLINK == 1 ]]; then
    readlink -m "$path"
  else
    echo "$path"
  fi
}

#Check if it's a file or directory
#Returns FILE/DIR/ERR
function db_stat
{
  local FILE=$(normalize_path "$1")

  #Checking if it's a file or a directory
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" "$API_METADATA_URL/$ACCESS_LEVEL/$(urlencode "$FILE")?oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" 2> /dev/null
  check_http_response

  #Even if the file/dir has been deleted from DropBox we receive a 200 OK response
  #So we must check if the file exists or if it has been deleted
  if grep -q "\"is_deleted\":" "$RESPONSE_FILE"; then
    local IS_DELETED=$(sed -n 's/.*"is_deleted":.\([^,]*\).*/\1/p' "$RESPONSE_FILE")
  else
    local IS_DELETED="false"
  fi

  #Exits...
  grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"
  if [[ $? == 0 && $IS_DELETED != "true" ]]; then

    local IS_DIR=$(sed -n 's/^\(.*\)\"contents":.\[.*/\1/p' "$RESPONSE_FILE")

    #It's a directory
    if [[ $IS_DIR != "" ]]; then
      echo "DIR"
    #It's a file
    else
      echo "FILE"
    fi

  #Doesn't exists
  else
    echo "ERR"
  fi
}

#Generic upload wrapper around db_upload_file and db_upload_dir functions
#$1 = Local source file/dir
#$2 = Remote destination file/dir
function db_upload
{
  local SRC=$(normalize_path "$1")
  local DST=$(normalize_path "$2")

  #Checking if the file/dir exists
  if [[ ! -e $SRC && ! -d $SRC ]]; then
    print " > No such file or directory: $SRC\n"
    ERROR_STATUS=1
    return
  fi

  #Checking if the file/dir has read permissions
  if [[ ! -r $SRC ]]; then
    print " > Error reading file $SRC: permission denied\n"
    ERROR_STATUS=1
    return
  fi

  #Checking if DST it's a folder or if it doesn' exists (in this case will be the destination name)
  TYPE=$(db_stat "$DST")
  if [[ $TYPE == "DIR" ]]; then
    local filename=$(basename "$SRC")
    DST="$DST/$filename"
  fi

  #It's a directory
  if [[ -d $SRC ]]; then
    db_upload_dir "$SRC" "$DST"

  #It's a file
  elif [[ -e $SRC ]]; then
    db_upload_file "$SRC" "$DST"

  #Unsupported object...
  else
    print " > Skipping not regular file \"$SRC\"\n"
  fi
}

#Generic upload wrapper around db_chunked_upload_file and db_simple_upload_file
#The final upload function will be choosen based on the file size
#$1 = Local source file
#$2 = Remote destination file
function db_upload_file
{
  local FILE_SRC=$(normalize_path "$1")
  local FILE_DST=$(normalize_path "$2")

  shopt -s nocasematch

  #Checking not allowed file names
  basefile_dst=$(basename "$FILE_DST")
  if [[ $basefile_dst == "thumbs.db" || \
     $basefile_dst == "desktop.ini" || \
     $basefile_dst == ".ds_store" || \
     $basefile_dst == "icon\r" || \
     $basefile_dst == ".dropbox" || \
     $basefile_dst == ".dropbox.attr" \
    ]]; then
    print " > Skipping not allowed file name \"$FILE_DST\"\n"
    return
  fi

  shopt -u nocasematch

  #Checking file size
  FILE_SIZE=$(file_size "$FILE_SRC")

  #Checking if the file already exists
  TYPE=$(db_stat "$FILE_DST")
  if [[ $TYPE != "ERR" && $SKIP_EXISTING_FILES == 1 ]]; then
    print " > Skipping already existing file \"$FILE_DST\"\n"
    return
  fi

  if [[ $FILE_SIZE -gt 157286000 ]]; then
    #If the file is greater than 150Mb, the chunked_upload API will be used
    db_chunked_upload_file "$FILE_SRC" "$FILE_DST"
  else
    db_simple_upload_file "$FILE_SRC" "$FILE_DST"
  fi

}

#Simple file upload
#$1 = Local source file
#$2 = Remote destination file
function db_simple_upload_file
{
  local FILE_SRC=$(normalize_path "$1")
  local FILE_DST=$(normalize_path "$2")

  if [[ $SHOW_PROGRESSBAR == 1 && $QUIET == 0 ]]; then
    CURL_PARAMETERS="--progress-bar"
    LINE_CR="\n"
  else
    CURL_PARAMETERS="-s"
    LINE_CR=""
  fi

  print " > Uploading \"$FILE_SRC\" to \"$FILE_DST\"... $LINE_CR"
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES $CURL_PARAMETERS -i --globoff -o "$RESPONSE_FILE" --upload-file "$FILE_SRC" "$API_UPLOAD_URL/$ACCESS_LEVEL/$(urlencode "$FILE_DST")?oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM"
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
    print "DONE\n"
  else
    print "FAILED\n"
    print "An error occurred requesting /upload\n"
    ERROR_STATUS=1
  fi
}

#Chunked file upload
#$1 = Local source file
#$2 = Remote destination file
function db_chunked_upload_file
{
  local FILE_SRC=$(normalize_path "$1")
  local FILE_DST=$(normalize_path "$2")

  print " > Uploading \"$FILE_SRC\" to \"$FILE_DST\""

  local FILE_SIZE=$(file_size "$FILE_SRC")
  local OFFSET=0
  local UPLOAD_ID=""
  local UPLOAD_ERROR=0
  local CHUNK_PARAMS=""

  #Uploading chunks...
  while ([[ $OFFSET != $FILE_SIZE ]]); do

    let OFFSET_MB=$OFFSET/1024/1024

    #Create the chunk
    dd if="$FILE_SRC" of="$CHUNK_FILE" bs=1048576 skip=$OFFSET_MB count=$CHUNK_SIZE 2> /dev/null

    #Only for the first request these parameters are not included
    if [[ $OFFSET != 0 ]]; then
      CHUNK_PARAMS="upload_id=$UPLOAD_ID&offset=$OFFSET"
    fi

    #Uploading the chunk...
    $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --upload-file "$CHUNK_FILE" "$API_CHUNKED_UPLOAD_URL?$CHUNK_PARAMS&oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" 2> /dev/null
    check_http_response

    #Check
    if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
      print "."
      UPLOAD_ERROR=0
      UPLOAD_ID=$(sed -n 's/.*"upload_id": *"*\([^"]*\)"*.*/\1/p' "$RESPONSE_FILE")
      OFFSET=$(sed -n 's/.*"offset": *\([^}]*\).*/\1/p' "$RESPONSE_FILE")
    else
      print "*"
      let UPLOAD_ERROR=$UPLOAD_ERROR+1

      #On error, the upload is retried for max 3 times
      if [[ $UPLOAD_ERROR -gt 2 ]]; then
        print " FAILED\n"
        print "An error occurred requesting /chunked_upload\n"
        ERROR_STATUS=1
        return
      fi
    fi

  done

  UPLOAD_ERROR=0

  #Commit the upload
  while (true); do

    $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "upload_id=$UPLOAD_ID&oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" "$API_CHUNKED_UPLOAD_COMMIT_URL/$ACCESS_LEVEL/$(urlencode "$FILE_DST")" 2> /dev/null
    check_http_response

    #Check
    if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
      print "."
      UPLOAD_ERROR=0
      break
    else
      print "*"
      let UPLOAD_ERROR=$UPLOAD_ERROR+1

      #On error, the commit is retried for max 3 times
      if [[ $UPLOAD_ERROR -gt 2 ]]; then
        print " FAILED\n"
        print "An error occurred requesting /commit_chunked_upload\n"
        ERROR_STATUS=1
        return
      fi
    fi

  done

  print " DONE\n"
}

#Directory upload
#$1 = Local source dir
#$2 = Remote destination dir
function db_upload_dir
{
  local DIR_SRC=$(normalize_path "$1")
  local DIR_DST=$(normalize_path "$2")

  #Creatig remote directory
  db_mkdir "$DIR_DST"

  for file in "$DIR_SRC/"*; do
    db_upload "$file" "$DIR_DST"
  done
}

#Returns the free space on DropBox in bytes
function db_free_quota
{
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" "$API_INFO_URL" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then

    quota=$(sed -n 's/.*"quota": \([0-9]*\).*/\1/p' "$RESPONSE_FILE")
    used=$(sed -n 's/.*"normal": \([0-9]*\).*/\1/p' "$RESPONSE_FILE")
    let free_quota=$quota-$used
    echo $free_quota

  else
    echo 0
  fi
}

#Generic download wrapper
#$1 = Remote source file/dir
#$2 = Local destination file/dir
function db_download
{
  local SRC=$(normalize_path "$1")
  local DST=$(normalize_path "$2")

  TYPE=$(db_stat "$SRC")

  #It's a directory
  if [[ $TYPE == "DIR" ]]; then

    #If the DST folder is not specified, I assume that is the current directory
    if [[ $DST == "" ]]; then
      DST="."
    fi

    #Checking if the destination directory exists
    if [[ ! -d $DST ]]; then
      local basedir=""
    else
      local basedir=$(basename "$SRC")
    fi

    local DEST_DIR=$(normalize_path "$DST/$basedir")
    print " > Downloading \"$SRC\" to \"$DEST_DIR\"... \n"
    print " > Creating local directory \"$DEST_DIR\"... "
    mkdir -p "$DEST_DIR"

    #Check
    if [[ $? == 0 ]]; then
      print "DONE\n"
    else
      print "FAILED\n"
      ERROR_STATUS=1
      return
    fi

    #Extracting directory content [...]
    #and replacing "}, {" with "}\n{"
    #I don't like this piece of code... but seems to be the only way to do this with SED, writing a portable code...
    local DIR_CONTENT=$(sed -n 's/.*: \[{\(.*\)/\1/p' "$RESPONSE_FILE" | sed 's/}, *{/}\
{/g')

    #Extracting files and subfolders
    TMP_DIR_CONTENT_FILE="${RESPONSE_FILE}_$RANDOM"
    echo "$DIR_CONTENT" | sed -n 's/.*"path": *"\([^"]*\)",.*"is_dir": *\([^"]*\),.*/\1:\2/p' > $TMP_DIR_CONTENT_FILE

    #For each entry...
    while read -r line; do

      local FILE=${line%:*}
      local TYPE=${line#*:}

      #Removing unneeded /
      FILE=${FILE##*/}

      if [[ $TYPE == "false" ]]; then
        db_download_file "$SRC/$FILE" "$DEST_DIR/$FILE"
      else
        db_download "$SRC/$FILE" "$DEST_DIR"
      fi

    done < $TMP_DIR_CONTENT_FILE

    rm -fr $TMP_DIR_CONTENT_FILE

  #It's a file
  elif [[ $TYPE == "FILE" ]]; then

    #Checking DST
    if [[ $DST == "" ]]; then
      DST=$(basename "$SRC")
    fi

    #If the destination is a directory, the file will be download into
    if [[ -d $DST ]]; then
      DST="$DST/$SRC"
    fi

    db_download_file "$SRC" "$DST"

  #Doesn't exists
  else
    print " > No such file or directory: $SRC\n"
    ERROR_STATUS=1
    return
  fi
}

#Simple file download
#$1 = Remote source file
#$2 = Local destination file
function db_download_file
{
  local FILE_SRC=$(normalize_path "$1")
  local FILE_DST=$(normalize_path "$2")

  if [[ $SHOW_PROGRESSBAR == 1 && $QUIET == 0 ]]; then
    CURL_PARAMETERS="--progress-bar"
    LINE_CR="\n"
  else
    CURL_PARAMETERS="-s"
    LINE_CR=""
  fi

  #Checking if the file already exists
  if [[ -e $FILE_DST && $SKIP_EXISTING_FILES == 1 ]]; then
    print " > Skipping already existing file \"$FILE_DST\"\n"
    return
  fi

  #Creating the empty file, that for two reasons:
  #1) In this way I can check if the destination file is writable or not
  #2) Curl doesn't automatically creates files with 0 bytes size
  dd if=/dev/zero of="$FILE_DST" count=0 2> /dev/null
  if [[ $? != 0 ]]; then
    print " > Error writing file $FILE_DST: permission denied\n"
    ERROR_STATUS=1
    return
  fi

  print " > Downloading \"$FILE_SRC\" to \"$FILE_DST\"... $LINE_CR"
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES $CURL_PARAMETERS --globoff -D "$RESPONSE_FILE" -o "$FILE_DST" "$API_DOWNLOAD_URL/$ACCESS_LEVEL/$(urlencode "$FILE_SRC")?oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM"
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
    print "DONE\n"
  else
    print "FAILED\n"
    rm -fr "$FILE_DST"
    ERROR_STATUS=1
    return
  fi
}

#Prints account info
function db_account_info
{
  print "Dropbox Uploader v$VERSION\n\n"
  print " > Getting info... "
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" "$API_INFO_URL" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then

    name=$(sed -n 's/.*"display_name": "\([^"]*\).*/\1/p' "$RESPONSE_FILE")
    echo -e "\n\nName:\t$name"

    uid=$(sed -n 's/.*"uid": \([0-9]*\).*/\1/p' "$RESPONSE_FILE")
    echo -e "UID:\t$uid"

    email=$(sed -n 's/.*"email": "\([^"]*\).*/\1/p' "$RESPONSE_FILE")
    echo -e "Email:\t$email"

    quota=$(sed -n 's/.*"quota": \([0-9]*\).*/\1/p' "$RESPONSE_FILE")
    let quota_mb=$quota/1024/1024
    echo -e "Quota:\t$quota_mb Mb"

    used=$(sed -n 's/.*"normal": \([0-9]*\).*/\1/p' "$RESPONSE_FILE")
    let used_mb=$used/1024/1024
    echo -e "Used:\t$used_mb Mb"

    let free_mb=($quota-$used)/1024/1024
    echo -e "Free:\t$free_mb Mb"

    echo ""

  else
    print "FAILED\n"
    ERROR_STATUS=1
  fi
}

#Account unlink
function db_unlink
{
  echo -ne "Are you sure you want unlink this script from your Dropbox account? [y/n]"
  read answer
  if [[ $answer == "y" ]]; then
    rm -fr "$CONFIG_FILE"
    echo -ne "DONE\n"
  fi
}

#Delete a remote file
#$1 = Remote file to delete
function db_delete
{
  local FILE_DST=$(normalize_path "$1")

  print " > Deleting \"$FILE_DST\"... "
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM&root=$ACCESS_LEVEL&path=$(urlencode "$FILE_DST")" "$API_DELETE_URL" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
    print "DONE\n"
  else
    print "FAILED\n"
    ERROR_STATUS=1
  fi
}

#Move/Rename a remote file
#$1 = Remote file to rename or move
#$2 = New file name or location
function db_move
{
  local FILE_SRC=$(normalize_path "$1")
  local FILE_DST=$(normalize_path "$2")

  TYPE=$(db_stat "$FILE_DST")

  #If the destination it's a directory, the source will be moved into it
  if [[ $TYPE == "DIR" ]]; then
    local filename=$(basename "$FILE_SRC")
    FILE_DST=$(normalize_path "$FILE_DST/$filename")
  fi

  print " > Moving \"$FILE_SRC\" to \"$FILE_DST\" ... "
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM&root=$ACCESS_LEVEL&from_path=$(urlencode "$FILE_SRC")&to_path=$(urlencode "$FILE_DST")" "$API_MOVE_URL" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
    print "DONE\n"
  else
    print "FAILED\n"
    ERROR_STATUS=1
  fi
}

#Copy a remote file to a remote location
#$1 = Remote file to rename or move
#$2 = New file name or location
function db_copy
{
  local FILE_SRC=$(normalize_path "$1")
  local FILE_DST=$(normalize_path "$2")

  TYPE=$(db_stat "$FILE_DST")

  #If the destination it's a directory, the source will be copied into it
  if [[ $TYPE == "DIR" ]]; then
    local filename=$(basename "$FILE_SRC")
    FILE_DST=$(normalize_path "$FILE_DST/$filename")
  fi

  print " > Copying \"$FILE_SRC\" to \"$FILE_DST\" ... "
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM&root=$ACCESS_LEVEL&from_path=$(urlencode "$FILE_SRC")&to_path=$(urlencode "$FILE_DST")" "$API_COPY_URL" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
    print "DONE\n"
  else
    print "FAILED\n"
    ERROR_STATUS=1
  fi
}

#Create a new directory
#$1 = Remote directory to create
function db_mkdir
{
  local DIR_DST=$(normalize_path "$1")

  print " > Creating Directory \"$DIR_DST\"... "
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM&root=$ACCESS_LEVEL&path=$(urlencode "$DIR_DST")" "$API_MKDIR_URL" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
    print "DONE\n"
  elif grep -q "^HTTP/1.1 403 Forbidden" "$RESPONSE_FILE"; then
    print "ALREADY EXISTS\n"
  else
    print "FAILED\n"
    ERROR_STATUS=1
  fi
}

#List remote directory
#$1 = Remote directory
function db_list
{
  local DIR_DST=$(normalize_path "$1")

  print " > Listing \"$DIR_DST\"... "
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" "$API_METADATA_URL/$ACCESS_LEVEL/$(urlencode "$DIR_DST")?oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then

    local IS_DIR=$(sed -n 's/^\(.*\)\"contents":.\[.*/\1/p' "$RESPONSE_FILE")

    #It's a directory
    if [[ $IS_DIR != "" ]]; then

      print "DONE\n"

      #Extracting directory content [...]
      #and replacing "}, {" with "}\n{"
      #I don't like this piece of code... but seems to be the only way to do this with SED, writing a portable code...
      local DIR_CONTENT=$(sed -n 's/.*: \[{\(.*\)/\1/p' "$RESPONSE_FILE" | sed 's/}, *{/}\
{/g')

      #Converting escaped quotes to unicode format
      echo "$DIR_CONTENT" | sed 's/\\"/\\u0022/' > "$TEMP_FILE"

      #Extracting files and subfolders
      rm -fr "$RESPONSE_FILE"
      while read -r line; do

        local FILE=$(echo "$line" | sed -n 's/.*"path": *"\([^"]*\)".*/\1/p')
        local IS_DIR=$(echo "$line" | sed -n 's/.*"is_dir": *\([^,]*\).*/\1/p')
        local SIZE=$(echo "$line" | sed -n 's/.*"bytes": *\([0-9]*\).*/\1/p')

        echo -e "$FILE:$IS_DIR;$SIZE" >> "$RESPONSE_FILE"

      done < "$TEMP_FILE"

      #Looking for the biggest file size
      #to calculate the padding to use
      local padding=0
      while read -r line; do
        local FILE=${line%:*}
        local META=${line##*:}
        local SIZE=${META#*;}

        if [[ ${#SIZE} -gt $padding ]]; then
          padding=${#SIZE}
        fi
      done < "$RESPONSE_FILE"

      #For each entry, printing directories...
      while read -r line; do

        local FILE=${line%:*}
        local META=${line##*:}
        local TYPE=${META%;*}
        local SIZE=${META#*;}

        #Removing unneeded /
        FILE=${FILE##*/}

        if [[ $TYPE != "false" ]]; then
          FILE=$(echo -e "$FILE")
          $PRINTF " [D] %-${padding}s %s\n" "$SIZE" "$FILE"
        fi

      done < "$RESPONSE_FILE"

      #For each entry, printing files...
      while read -r line; do

        local FILE=${line%:*}
        local META=${line##*:}
        local TYPE=${META%;*}
        local SIZE=${META#*;}

        #Removing unneeded /
        FILE=${FILE##*/}

        if [[ $TYPE == "false" ]]; then
          FILE=$(echo -e "$FILE")
          $PRINTF " [F] %-${padding}s %s\n" "$SIZE" "$FILE"
        fi

      done < "$RESPONSE_FILE"

    #It's a file
    else
      print "FAILED: $DIR_DST is not a directory!\n"
      ERROR_STATUS=1
    fi

  else
    print "FAILED\n"
    ERROR_STATUS=1
  fi
}

#Share remote file
#$1 = Remote file
function db_share
{
  local FILE_DST=$(normalize_path "$1")

  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" "$API_SHARES_URL/$ACCESS_LEVEL/$(urlencode "$FILE_DST")?oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_ACCESS_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_ACCESS_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM&short_url=false" 2> /dev/null
  check_http_response

  #Check
  if grep -q "^HTTP/1.1 200 OK" "$RESPONSE_FILE"; then
    print " > Share link: "
    echo $(sed -n 's/.*"url": "\([^"]*\).*/\1/p' "$RESPONSE_FILE")
  else
    print "FAILED\n"
    ERROR_STATUS=1
  fi
}

################
#### SETUP ####
################

#CHECKING FOR AUTH FILE
if [[ -e $CONFIG_FILE ]]; then

  #Loading data... and change old format config if necesary.
  source "$CONFIG_FILE" 2>/dev/null || {
    sed -i'' 's/:/=/' "$CONFIG_FILE" && source "$CONFIG_FILE" 2>/dev/null
  }

  #Checking the loaded data
  if [[ $APPKEY == "" || $APPSECRET == "" || $OAUTH_ACCESS_TOKEN_SECRET == "" || $OAUTH_ACCESS_TOKEN == "" ]]; then
    echo -ne "Error loading data from $CONFIG_FILE...\n"
    echo -ne "It is recommended to run $0 unlink\n"
    remove_temp_files
    exit 1
  fi

  #Back compatibility with previous Dropbox Uploader versions
  if [[ $ACCESS_LEVEL == "" ]]; then
    ACCESS_LEVEL="dropbox"
  fi

#NEW SETUP...
else

  echo -ne "\n This is the first time you run this script.\n\n"
  echo -ne " 1) Open the following URL in your Browser, and log in using your account: $APP_CREATE_URL\n"
  echo -ne " 2) Click on \"Create App\", then select \"Dropbox API app\"\n"
  echo -ne " 3) Select \"Files and datastores\"\n"
  echo -ne " 4) Now go on with the configuration, choosing the app permissions and access restrictions to your DropBox folder\n"
  echo -ne " 5) Enter the \"App Name\" that you prefer (e.g. MyUploader$RANDOM$RANDOM$RANDOM)\n\n"

  echo -ne " Now, click on the \"Create App\" button.\n\n"

  echo -ne " When your new App is successfully created, please type the\n"
  echo -ne " App Key, App Secret and the Permission type shown in the confirmation page:\n\n"

  #Getting the app key and secret from the user
  while (true); do

    echo -n " # App key: "
    read APPKEY

    echo -n " # App secret: "
    read APPSECRET

    echo -n " # Permission type, App folder or Full Dropbox [a/f]: "
    read ACCESS_LEVEL

    if [[ $ACCESS_LEVEL == "a" ]]; then
      ACCESS_LEVEL="sandbox"
      ACCESS_MSG="App Folder"
    else
      ACCESS_LEVEL="dropbox"
      ACCESS_MSG="Full Dropbox"
    fi

    echo -ne "\n > App key is $APPKEY, App secret is $APPSECRET and Access level is $ACCESS_MSG. Looks ok? [y/n]: "
    read answer
    if [[ $answer == "y" ]]; then
      break;
    fi

  done

  #TOKEN REQUESTS
  echo -ne "\n > Token request... "
  $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" "$API_REQUEST_TOKEN_URL" 2> /dev/null
  check_http_response
  OAUTH_TOKEN_SECRET=$(sed -n 's/oauth_token_secret=\([a-z A-Z 0-9]*\).*/\1/p' "$RESPONSE_FILE")
  OAUTH_TOKEN=$(sed -n 's/.*oauth_token=\([a-z A-Z 0-9]*\)/\1/p' "$RESPONSE_FILE")

  if [[ $OAUTH_TOKEN != "" && $OAUTH_TOKEN_SECRET != "" ]]; then
    echo -ne "OK\n"
  else
    echo -ne " FAILED\n\n Please, check your App key and secret...\n\n"
    remove_temp_files
    exit 1
  fi

  while (true); do

    #USER AUTH
    echo -ne "\n Please open the following URL in your browser, and allow Dropbox Uploader\n"
    echo -ne " to access your DropBox folder:\n\n --> ${API_USER_AUTH_URL}?oauth_token=$OAUTH_TOKEN\n"
    echo -ne "\nPress enter when done...\n"
    read

    #API_ACCESS_TOKEN_URL
    echo -ne " > Access Token request... "
    $CURL_BIN $CURL_ACCEPT_CERTIFICATES -s --show-error --globoff -i -o "$RESPONSE_FILE" --data "oauth_consumer_key=$APPKEY&oauth_token=$OAUTH_TOKEN&oauth_signature_method=PLAINTEXT&oauth_signature=$APPSECRET%26$OAUTH_TOKEN_SECRET&oauth_timestamp=$(utime)&oauth_nonce=$RANDOM" "$API_ACCESS_TOKEN_URL" 2> /dev/null
    check_http_response
    OAUTH_ACCESS_TOKEN_SECRET=$(sed -n 's/oauth_token_secret=\([a-z A-Z 0-9]*\)&.*/\1/p' "$RESPONSE_FILE")
    OAUTH_ACCESS_TOKEN=$(sed -n 's/.*oauth_token=\([a-z A-Z 0-9]*\)&.*/\1/p' "$RESPONSE_FILE")
    OAUTH_ACCESS_UID=$(sed -n 's/.*uid=\([0-9]*\)/\1/p' "$RESPONSE_FILE")

    if [[ $OAUTH_ACCESS_TOKEN != "" && $OAUTH_ACCESS_TOKEN_SECRET != "" && $OAUTH_ACCESS_UID != "" ]]; then
      echo -ne "OK\n"

      #Saving data in new format, compatible with source command.
      echo "APPKEY=$APPKEY" > "$CONFIG_FILE"
      echo "APPSECRET=$APPSECRET" >> "$CONFIG_FILE"
      echo "ACCESS_LEVEL=$ACCESS_LEVEL" >> "$CONFIG_FILE"
      echo "OAUTH_ACCESS_TOKEN=$OAUTH_ACCESS_TOKEN" >> "$CONFIG_FILE"
      echo "OAUTH_ACCESS_TOKEN_SECRET=$OAUTH_ACCESS_TOKEN_SECRET" >> "$CONFIG_FILE"

      echo -ne "\n Setup completed!\n"
      break
    else
      print " FAILED\n"
      ERROR_STATUS=1
    fi

  done;

  remove_temp_files
  exit $ERROR_STATUS
fi

################
#### START ####
################

COMMAND=${@:$OPTIND:1}
ARG1=${@:$OPTIND+1:1}
ARG2=${@:$OPTIND+2:1}

let argnum=$#-$OPTIND

#CHECKING PARAMS VALUES
case $COMMAND in

  upload)

    if [[ $argnum -lt 2 ]]; then
      usage
    fi

    FILE_DST=${@:$#:1}

    for (( i=$OPTIND+1; i<$#; i++ )); do
      FILE_SRC=${@:$i:1}
      db_upload "$FILE_SRC" "/$FILE_DST"
    done

  ;;

  download)

    if [[ $argnum -lt 1 ]]; then
      usage
    fi

    FILE_SRC=$ARG1
    FILE_DST=$ARG2

    db_download "/$FILE_SRC" "$FILE_DST"

  ;;

  share)

    if [[ $argnum -lt 1 ]]; then
      usage
    fi

    FILE_DST=$ARG1

    db_share "/$FILE_DST"

  ;;

  info)

    db_account_info

  ;;

  delete|remove)

    if [[ $argnum -lt 1 ]]; then
      usage
    fi

    FILE_DST=$ARG1

    db_delete "/$FILE_DST"

  ;;

  move|rename)

    if [[ $argnum -lt 2 ]]; then
      usage
    fi

    FILE_SRC=$ARG1
    FILE_DST=$ARG2

    db_move "/$FILE_SRC" "/$FILE_DST"

  ;;

  copy)

    if [[ $argnum -lt 2 ]]; then
      usage
    fi

    FILE_SRC=$ARG1
    FILE_DST=$ARG2

    db_copy "/$FILE_SRC" "/$FILE_DST"

  ;;

  mkdir)

    if [[ $argnum -lt 1 ]]; then
      usage
    fi

    DIR_DST=$ARG1

    db_mkdir "/$DIR_DST"

  ;;

  list)

    DIR_DST=$ARG1

    #Checking DIR_DST
    if [[ $DIR_DST == "" ]]; then
      DIR_DST="/"
    fi

    db_list "/$DIR_DST"

  ;;

  unlink)

    db_unlink

  ;;

  *)

    if [[ $COMMAND != "" ]]; then
      print "Error: Unknown command: $COMMAND\n\n"
      ERROR_STATUS=1
    fi
    usage

  ;;

esac

remove_temp_files
exit $ERROR_STATUS