calibre-web/cps/helper.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import db
import ub
from flask import current_app as app
import logging
import smtplib
import tempfile
import socket
import sys
import os
import traceback
import re
import unicodedata
from StringIO import StringIO
from email import encoders
from email.MIMEBase import MIMEBase
from email.MIMEMultipart import MIMEMultipart
from email.MIMEText import MIMEText
from email.generator import Generator
from flask_babel import gettext as _
import subprocess


def update_download(book_id, user_id):
    check = ub.session.query(ub.Downloads).filter(ub.Downloads.user_id == user_id).filter(ub.Downloads.book_id ==
                                                                                          book_id).first()

    if not check:
        new_download = ub.Downloads(user_id=user_id, book_id=book_id)
        ub.session.add(new_download)
        ub.session.commit()


def make_mobi(book_id, calibrepath):
    vendorpath = os.path.join(os.path.normpath(os.path.dirname(os.path.realpath(__file__)) +
                                               os.sep + "../vendor" + os.sep))
    if sys.platform == "win32":
        kindlegen = os.path.join(vendorpath, u"kindlegen.exe")
    else:
        kindlegen = os.path.join(vendorpath, u"kindlegen")
    if not os.path.exists(kindlegen):
        app.logger.error("make_mobi: kindlegen binary not found in: %s" % kindlegen)
        return None
    book = db.session.query(db.Books).filter(db.Books.id == book_id).first()
    data = db.session.query(db.Data).filter(db.Data.book == book.id).filter(db.Data.format == 'EPUB').first()
    if not data:
        app.logger.error("make_mobi: epub format not found for book id: %d" % book_id)
        return None

    file_path = os.path.join(calibrepath, book.path, data.name)
    if os.path.exists(file_path + u".epub"):
        p = subprocess.Popen((kindlegen + " \"" + file_path + u".epub\" ").encode(sys.getfilesystemencoding()),
                             shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
        # Poll process for new output until finished
        while True:
            nextline = p.stdout.readline()
            if nextline == '' and p.poll() is not None:
                break
            if nextline != "\r\n":
                app.logger.debug(nextline.strip('\r\n'))

        check = p.returncode
        if not check or check < 2:
            book.data.append(db.Data(
                    name=book.data[0].name,
                    format="MOBI",
                    book=book.id,
                    uncompressed_size=os.path.getsize(file_path + ".mobi")
                ))
            db.session.commit()
            return file_path + ".mobi"
        else:
            app.logger.error("make_mobi: kindlegen failed with error while converting book")
            return None
    else:
        app.logger.error("make_mobie: epub not found: %s.epub" % file_path)
        return None


class StderrLogger(object):

    buffer = ''

    def __init__(self):
        self.logger = logging.getLogger('cps.web')

    def write(self, message):
        if message == '\n':
            self.logger.debug(self.buffer)
            self.buffer = ''
        else:
            self.buffer += message


def send_raw_email(kindle_mail, msg):
    settings = ub.get_mail_settings()

    msg['From'] = settings["mail_from"]
    msg['To'] = kindle_mail

    use_ssl = int(settings.get('mail_use_ssl', 0))

    # convert MIME message to string
    fp = StringIO()
    gen = Generator(fp, mangle_from_=False)
    gen.flatten(msg)
    msg = fp.getvalue()

    # send email
    try:
        timeout = 600     # set timeout to 5mins

        org_stderr = smtplib.stderr
        smtplib.stderr = StderrLogger()

        if use_ssl == 2:
            mailserver = smtplib.SMTP_SSL(settings["mail_server"], settings["mail_port"], timeout)
        else:
            mailserver = smtplib.SMTP(settings["mail_server"], settings["mail_port"], timeout)
        mailserver.set_debuglevel(1)

        if use_ssl == 1:
            mailserver.starttls()

        if settings["mail_password"]:
            mailserver.login(settings["mail_login"], settings["mail_password"])
        mailserver.sendmail(settings["mail_login"], kindle_mail, msg)
        mailserver.quit()

        smtplib.stderr = org_stderr

    except (socket.error, smtplib.SMTPRecipientsRefused, smtplib.SMTPException), e:
        app.logger.error(traceback.print_exc())
        return _("Failed to send mail: %s" % str(e))

    return None


def send_test_mail(kindle_mail):
    msg = MIMEMultipart()
    msg['Subject'] = _(u'Calibre-web test email')
    text = _(u'This email has been sent via calibre web.')
    msg.attach(MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8'))
    return send_raw_email(kindle_mail, msg)


def send_mail(book_id, kindle_mail, calibrepath):
    """Send email with attachments"""
    # create MIME message
    msg = MIMEMultipart()
    msg['Subject'] = _(u'Send to Kindle')
    text = _(u'This email has been sent via calibre web.')
    msg.attach(MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8'))

    book = db.session.query(db.Books).filter(db.Books.id == book_id).first()
    data = db.session.query(db.Data).filter(db.Data.book == book.id)

    formats = {}

    for entry in data:
        if entry.format == "MOBI":
            formats["mobi"] = os.path.join(calibrepath, book.path, entry.name + ".mobi")
        if entry.format == "EPUB":
            formats["epub"] = os.path.join(calibrepath, book.path, entry.name + ".epub")
        if entry.format == "PDF":
            formats["pdf"] = os.path.join(calibrepath, book.path, entry.name + ".pdf")

    if len(formats) == 0:
        return _("Could not find any formats suitable for sending by email")

    if 'mobi' in formats:
        msg.attach(get_attachment(formats['mobi']))
    elif 'epub' in formats:
        filepath = make_mobi(book.id, calibrepath)
        if filepath is not None:
            msg.attach(get_attachment(filepath))
        elif filepath is None:
            return _("Could not convert epub to mobi")
        elif 'pdf' in formats:
            msg.attach(get_attachment(formats['pdf']))
    elif 'pdf' in formats:
        msg.attach(get_attachment(formats['pdf']))
    else:
        return _("Could not find any formats suitable for sending by email")

    return send_raw_email(kindle_mail, msg)


def get_attachment(file_path):
    """Get file as MIMEBase message"""

    try:
        file_ = open(file_path, 'rb')
        attachment = MIMEBase('application', 'octet-stream')
        attachment.set_payload(file_.read())
        file_.close()
        encoders.encode_base64(attachment)

        attachment.add_header('Content-Disposition', 'attachment',
                              filename=os.path.basename(file_path))
        return attachment
    except IOError:
        traceback.print_exc()
        message = (_('The requested file could not be read. Maybe wrong permissions?'))  # ToDo: What is this?
        return None


def get_valid_filename(value, replace_whitespace=True):
    """
    Returns the given string converted to a string that can be used for a clean
    filename. Limits num characters to 128 max.
    """
    value = value[:128]
    # re_slugify = re.compile('[^\w\s-]', re.UNICODE)
    value = unicodedata.normalize('NFKD', value)
    re_slugify = re.compile('[^\w\s-]', re.UNICODE)
    value = unicode(re_slugify.sub('', value).strip())
    if replace_whitespace:
        value = re.sub('[\s]+', '_', value, flags=re.U)
    value = value.replace(u"\u00DF", "ss")
    return value


def get_normalized_author(value):
    """
    Normalizes sorted author name
    """
    value = unicodedata.normalize('NFKD', value)
    value = re.sub('[^\w,\s]', '', value, flags=re.U)
    value = " ".join(value.split(", ")[::-1])
    return value
    

def update_dir_stucture(book_id, calibrepath):
    db.session.connection().connection.connection.create_function("title_sort", 1, db.title_sort)
    book = db.session.query(db.Books).filter(db.Books.id == book_id).first()
    path = os.path.join(calibrepath, book.path)
    
    authordir = book.path.split(os.sep)[0]
    new_authordir = get_valid_filename(book.authors[0].name, False)
    titledir = book.path.split(os.sep)[1]
    new_titledir = get_valid_filename(book.title, False) + " (" + str(book_id) + ")"
    
    if titledir != new_titledir:
        new_title_path = os.path.join(os.path.dirname(path), new_titledir)
        os.rename(path, new_title_path)
        path = new_title_path
        book.path = book.path.split(os.sep)[0] + os.sep + new_titledir
    
    if authordir != new_authordir:
        new_author_path = os.path.join(os.path.join(calibrepath, new_authordir), os.path.basename(path))
        os.renames(path, new_author_path)
        book.path = new_authordir + os.sep + book.path.split(os.sep)[1]
    db.session.commit()