def on_book(self):
        self.utils.report.attachment(None, self.book["source"], "DEBUG")
        epub = Epub(self.utils.report, self.book["source"])

        epubTitle = ""
        try:
            epubTitle = " (" + epub.meta("dc:title") + ") "
        except Exception:
            pass

        # sjekk at dette er en EPUB
        if not epub.isepub():
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž"
            return

        if not epub.identifier():
            self.utils.report.error(
                self.book["name"] +
                ": Klarte ikke Γ₯ bestemme boknummer basert pΓ₯ dc:identifier.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž"
            return

        # ---------- lag en kopi av EPUBen ----------

        temp_epubdir_obj = tempfile.TemporaryDirectory()
        temp_epubdir = temp_epubdir_obj.name
        Filesystem.copy(self.utils.report, self.book["source"], temp_epubdir)
        temp_epub = Epub(self.utils.report, temp_epubdir)

        # ---------- gjΓΈr tilpasninger i HTML-fila med XSLT ----------

        opf_path = temp_epub.opf_path()
        if not opf_path:
            self.utils.report.error(self.book["name"] +
                                    ": Klarte ikke Γ₯ finne OPF-fila i EPUBen.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return
        opf_path = os.path.join(temp_epubdir, opf_path)
        opf_xml = ElementTree.parse(opf_path).getroot()

        html_file = opf_xml.xpath(
            "/*/*[local-name()='manifest']/*[@id = /*/*[local-name()='spine']/*[1]/@idref]/@href"
        )
        html_file = html_file[0] if html_file else None
        if not html_file:
            self.utils.report.error(self.book["name"] +
                                    ": Klarte ikke Γ₯ finne HTML-fila i OPFen.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return
        html_file = os.path.join(os.path.dirname(opf_path), html_file)
        if not os.path.isfile(html_file):
            self.utils.report.error(self.book["name"] +
                                    ": Klarte ikke Γ₯ finne HTML-fila.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return

        temp_xml_obj = tempfile.NamedTemporaryFile()
        temp_xml = temp_xml_obj.name

        self.utils.report.info("Flater ut NLBPUB")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, NlbpubToEpub.uid,
                                            "nlbpub-flatten.xsl"),
                    source=html_file,
                    target=temp_xml)
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return
        shutil.copy(temp_xml, html_file)

        self.utils.report.info("Deler opp NLBPUB i flere HTML-filer")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, NlbpubToEpub.uid,
                                            "nlbpub-split.xsl"),
                    source=html_file,
                    target=temp_xml,
                    parameters={"output-dir": os.path.dirname(html_file)})
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return
        os.remove(html_file)

        spine_hrefs = []
        for href in sorted(os.listdir(os.path.dirname(html_file))):
            if href.endswith(".xhtml") and href not in [
                    "nav.xhtml", os.path.basename(html_file)
            ]:
                spine_hrefs.append(href)

        self.utils.report.info("Oppdaterer OPF-fil")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, NlbpubToEpub.uid,
                                            "update-opf.xsl"),
                    source=opf_path,
                    target=temp_xml,
                    parameters={"spine-hrefs": ",".join(spine_hrefs)})
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return
        shutil.copy(temp_xml, opf_path)

        nav_path = os.path.join(temp_epubdir, temp_epub.nav_path())

        self.utils.report.info("Lager nytt navigasjonsdokument")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, NlbpubToEpub.uid,
                                            "generate-nav.xsl"),
                    source=opf_path,
                    target=nav_path)
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return

        self.utils.report.info("Legger til properties i OPF etter behov")
        temp_epub.update_opf_properties()

        if Epubcheck.isavailable():
            epubcheck = Epubcheck(self, opf_path)
            if not epubcheck.success:
                self.utils.report.title = self.title + ": " + epub.identifier(
                ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
                return
        else:
            self.utils.report.warn(
                "Epubcheck not available, EPUB will not be validated!")

        self.utils.report.info(
            "Boken ble konvertert. Kopierer til e-bok-arkiv.")

        archived_path, stored = self.utils.filesystem.storeBook(
            temp_epubdir, temp_epub.identifier())
        self.utils.report.attachment(None, archived_path, "DEBUG")
        Bibliofil.book_available(NlbpubToEpub.publication_format,
                                 temp_epub.identifier())
        self.utils.report.title = self.title + ": " + epub.identifier(
        ) + " ble konvertert πŸ‘πŸ˜„" + epubTitle
        return True
    def on_book(self):
        self.utils.report.attachment(None, self.book["source"], "DEBUG")
        epub = Epub(self.utils.report, self.book["source"])

        epubTitle = ""
        try:
            epubTitle = " (" + epub.meta("dc:title") + ") "
        except Exception:
            pass

        # sjekk at dette er en EPUB
        if not epub.isepub():
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž"
            return False

        if not epub.identifier():
            self.utils.report.error(
                self.book["name"] +
                ": Klarte ikke Γ₯ bestemme boknummer basert pΓ₯ dc:identifier.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž"
            return False

        # ---------- lag en kopi av EPUBen ----------

        temp_epubdir_obj = tempfile.TemporaryDirectory()
        temp_epubdir = temp_epubdir_obj.name
        Filesystem.copy(self.utils.report, self.book["source"], temp_epubdir)
        temp_epub = Epub(self.utils.report, temp_epubdir)

        # ---------- gjΓΈr tilpasninger i HTML-fila med XSLT ----------

        opf_path = temp_epub.opf_path()
        if not opf_path:
            self.utils.report.error(self.book["name"] +
                                    ": Klarte ikke Γ₯ finne OPF-fila i EPUBen.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return False
        opf_path = os.path.join(temp_epubdir, opf_path)
        opf_xml = ElementTree.parse(opf_path).getroot()

        html_file = opf_xml.xpath(
            "/*/*[local-name()='manifest']/*[@id = /*/*[local-name()='spine']/*[1]/@idref]/@href"
        )
        html_file = html_file[0] if html_file else None
        if not html_file:
            self.utils.report.error(self.book["name"] +
                                    ": Klarte ikke Γ₯ finne HTML-fila i OPFen.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return False
        html_dir = os.path.dirname(opf_path)
        html_file = os.path.join(html_dir, html_file)
        if not os.path.isfile(html_file):
            self.utils.report.error(self.book["name"] +
                                    ": Klarte ikke Γ₯ finne HTML-fila.")
            self.utils.report.title = self.title + ": " + self.book[
                "name"] + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return False

        temp_xml_obj = tempfile.NamedTemporaryFile()
        temp_xml = temp_xml_obj.name

        # MATHML to stem
        self.utils.report.info("Erstatter evt. MathML i boka...")
        mathml_validation = Mathml_validator(self, source=html_file)
        if not mathml_validation.success:
            self.utils.report.error(
                "NLBPUB contains MathML errors, aborting...")
            return False

        mathML_result = Mathml_to_text(self,
                                       source=html_file,
                                       target=html_file)

        if not mathML_result.success:
            return False

        self.utils.report.info(
            "Lager skjulte overskrifter der det er nΓΈdvendig")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, PrepareForEbook.uid,
                                            "create-hidden-headlines.xsl"),
                    source=html_file,
                    target=temp_xml,
                    parameters={
                        "cover-headlines": "from-type",
                        "frontmatter-headlines": "from-type",
                        "bodymatter-headlines": "from-text",
                        "backmatter-headlines": "from-type"
                    })
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return False
        shutil.copy(temp_xml, html_file)

        self.utils.report.info("Tilpasser innhold for e-bok...")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, PrepareForEbook.uid,
                                            "prepare-for-ebook.xsl"),
                    source=html_file,
                    target=temp_xml)
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return False
        shutil.copy(temp_xml, html_file)

        # Use library-specific logo and stylesheet if available

        library = temp_epub.meta("schema:library")
        library = library.upper() if library else library
        logo = os.path.join(Xslt.xslt_dir, PrepareForEbook.uid,
                            "{}_logo.png".format(library))

        if os.path.isfile(logo):
            shutil.copy(logo, os.path.join(html_dir, os.path.basename(logo)))

        PrepareForEbook.update_css()

        stylesheet = PrepareForEbook.css_tempfile_obj.name
        if library is not None and library.lower() == "statped":
            stylesheet = PrepareForEbook.css_tempfile_statped_obj.name
        shutil.copy(stylesheet, os.path.join(html_dir, "ebok.css"))

        self.utils.report.info("Legger til logoen i OPF-manifestet")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, PrepareForEbook.uid,
                                            "add-to-opf-manifest.xsl"),
                    source=opf_path,
                    target=temp_xml,
                    parameters={
                        "href": os.path.basename(logo),
                        "media-type": "image/png"
                    })
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return False
        shutil.copy(temp_xml, opf_path)

        self.utils.report.info("Legger til CSS-fila i OPF-manifestet")
        xslt = Xslt(self,
                    stylesheet=os.path.join(Xslt.xslt_dir, PrepareForEbook.uid,
                                            "add-to-opf-manifest.xsl"),
                    source=opf_path,
                    target=temp_xml,
                    parameters={
                        "href": "ebok.css",
                        "media-type": "text/css"
                    })
        if not xslt.success:
            self.utils.report.title = self.title + ": " + epub.identifier(
            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
            return False
        shutil.copy(temp_xml, opf_path)

        # add cover if missing

        opf_xml = ElementTree.parse(opf_path).getroot()
        cover_id = opf_xml.xpath(
            "/*/*[local-name()='manifest']/*[contains(concat(' ', @properties, ' '), ' cover-image ')]/@id"
        )  # from properties
        if not cover_id:
            cover_id = opf_xml.xpath(
                "/*/*[local-name()='manifest']/*[@name='cover']/@content"
            )  # from metadata
        if not cover_id:
            cover_id = opf_xml.xpath(
                "/*/*[local-name()='manifest']/*[starts-with(@media-type, 'image/') and contains(@href, 'cover')]/@id"
            )  # from filename
        cover_id = cover_id[0] if cover_id else None

        if not cover_id:
            # cover not found in the book, let's try NLBs API

            # NOTE: identifier at this point is the e-book identifier
            edition_url = "{}/editions/{}?creative-work-metadata=none&edition-metadata=all".format(
                Config.get("nlb_api_url"), epub.identifier())

            response = requests.get(edition_url)
            self.utils.report.debug(
                "looking for cover image in: {}".format(edition_url))
            if response.status_code == 200:
                response_json = response.json()
                if "data" not in response_json:
                    self.utils.report.debug("response as JSON:")
                    self.utils.report.debug(str(response_json))
                    raise Exception(
                        "No 'data' in response: {}".format(edition_url))
                data = response_json["data"]
                cover_url = data["coverUrlLarge"]
                if cover_url is not None and cover_url.startswith("http"):
                    response = requests.get(cover_url)
                    if response.status_code == 200:
                        _, extension = os.path.splitext(cover_url)
                        target_href = "cover" + extension
                        target_dir = os.path.dirname(opf_path)
                        with open(os.path.join(target_dir, target_href),
                                  "wb") as target_file:
                            target_file.write(response.content)

                        self.utils.report.info(
                            "Legger til bildet av bokomslaget i OPF-manifestet"
                        )
                        media_type = None
                        if extension.lower() in [
                                ".png"
                        ]:  # check for png, just in case. Should always be jpg though.
                            media_type = "image/png"
                        else:
                            media_type = "image/jpeg"
                        xslt = Xslt(self,
                                    stylesheet=os.path.join(
                                        Xslt.xslt_dir, PrepareForEbook.uid,
                                        "add-to-opf-manifest.xsl"),
                                    source=opf_path,
                                    target=temp_xml,
                                    parameters={
                                        "href": target_href,
                                        "media-type": media_type
                                    })
                        if not xslt.success:
                            self.utils.report.title = self.title + ": " + epub.identifier(
                            ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
                            return False
                        shutil.copy(temp_xml, opf_path)

                        opf_xml = ElementTree.parse(opf_path).getroot()
                        cover_id = opf_xml.xpath(
                            "/*/*[local-name()='manifest']/*[@href = '{}']/@id"
                            .format(target_href))  # from filename
                        cover_id = cover_id[0] if cover_id else None

        if cover_id is None or len(cover_id) == 0:
            self.utils.report.warn(
                "Klarte ikke Γ₯ finne bilde av bokomslaget for {}".format(
                    epub.identifier()))

        self.utils.report.info("Legger til properties i OPF etter behov")
        temp_epub.update_opf_properties()

        # validate with epubcheck
        if Epubcheck.isavailable():
            epubcheck = Epubcheck(self, opf_path)
            if not epubcheck.success:
                tempfile_stored_opf = os.path.join(
                    self.utils.report.reportDir(), os.path.basename(opf_path))
                shutil.copy(opf_path, tempfile_stored_opf)
                tempfile_stored = os.path.join(self.utils.report.reportDir(),
                                               os.path.basename(html_file))
                shutil.copy(html_file, tempfile_stored)
                self.utils.report.info(
                    f"Validering av DTBook feilet, lagrer temp fil for feilsΓΈking: {tempfile_stored}"
                )
                self.utils.report.attachment(None, tempfile_stored, "DEBUG")
                self.utils.report.title = self.title + ": " + epub.identifier(
                ) + " feilet πŸ˜­πŸ‘Ž" + epubTitle
                return
        else:
            self.utils.report.warn(
                "Epubcheck er ikke tilgjengelig, EPUB blir ikke validert!")

        # ---------- lagre filsett ----------

        self.utils.report.info(
            "Boken ble konvertert. Kopierer til HTML-arkiv.")

        archived_path, stored = self.utils.filesystem.storeBook(
            temp_epubdir, epub.identifier())
        self.utils.report.attachment(None, archived_path, "DEBUG")
        self.utils.report.title = self.title + ": " + epub.identifier(
        ) + " ble konvertert πŸ‘πŸ˜„" + epubTitle
        return True