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            if author.get('sequence') == 'first':
                first_author_given_name = author.find(prefix + 'given_name').text
                first_author_surname = author.find(prefix + 'surname').text
            else:
                multiauthors = True
        year = link.find(prefix + 'journal_cite').find(prefix + 'year').text
        citations.append({'doi': doi,
                          'article_title': article_title,
                          'journal_abbreviation': journal_abbreviation,
                          'first_author_given_name': first_author_given_name,
                          'first_author_surname': first_author_surname,
                          'multiauthors': multiauthors,
                          'volume': volume,
                          'first_page': first_page,
                          'item_number': item_number,
    publication.citedby = citations
    publication.latest_citedby_update = timezone.now()
    publication.save()
    context = {
        'publication': publication,
        'response_headers': response_headers,
        'response_text': response_text,
        'response_deserialized': response_deserialized,
        'citations': citations,
    }
    return render(request, 'journals/harvest_citedby_links.html', context)


@login_required
def sign_existing_report(request, report_id):
    """
    Allows the author of a Report, originally submitted anonymously,
    to sign the Report.
    """
    report = get_object_or_404(Report, pk=report_id)
    if report.author != request.user.contributor:
        errormessage = 'Only the author of this Report can change its anonymity status'
        return render(request, 'scipost/error.html', context={'errormessage': errormessage})
    form = ConfirmationForm(request.POST or None)
    if form.is_valid():
        if form.cleaned_data['confirm'] == 'True':
            report.anonymous = False
            report.doideposit_needs_updating = True
            report.save()
            messages.success(request, 'Your Report is now publicly signed.')
        else:
            messages.error(request, 'Report signing operation cancelled.')
        return redirect(reverse('scipost:personal_page'))
    context = {'report': report, 'form': form}
    return render(request, 'journals/sign_existing_report.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
def manage_report_metadata(request):
    """
    This page offers Editorial Administrators tools for managing
    the metadata of Reports.
    """
    reports = Report.objects.all()
    paginator = Paginator(reports, 25)

    page = request.GET.get('page')
    try:
        reports = paginator.page(page)
    except PageNotAnInteger:
        reports = paginator.page(1)
    except EmptyPage:
        reports = paginator.page(paginator.num_pages)

    context = {
        'reports': reports,
    }
    return render(request, 'journals/manage_report_metadata.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
def manage_comment_metadata(request):
    """
    This page offers Editorial Administrators tools for managing
    the metadata of Comments.
    """
    comments = Comment.objects.all()
    context = {
        'comments': comments,
    }
    return render(request, 'journals/manage_comment_metadata.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
def mark_report_doi_needed(request, report_id, needed):
    report = get_object_or_404(Report, pk=report_id)
    if needed == '1':
        report.needs_doi = True
    elif needed == '0':
        report.needs_doi = False
    report.save()
    return redirect(reverse('journals:manage_report_metadata'))


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
def mark_comment_doi_needed(request, comment_id, needed):
    comment = get_object_or_404(Comment, pk=comment_id)
    if needed == '1':
        comment.needs_doi = True
    elif needed == '0':
        comment.needs_doi = False
    comment.save()
    return redirect(reverse('journals:manage_comment_metadata'))


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def generic_metadata_xml_deposit(request, **kwargs):
    """
    This method creates the metadata for non-Publication objects
    such as Reports and Comments, and deposits the metadata to
    Crossref.
    If there exists a relation to a SciPost-published object,
    the deposit uses Crossref's peer review content type.
    Otherwise the deposit is done as a dataset.
    """
    type_of_object = kwargs['type_of_object']
    object_id = int(kwargs['object_id'])
    if type_of_object == 'report':
        _object = get_object_or_404(Report, id=object_id)
    elif type_of_object == 'comment':
        _object = get_object_or_404(Comment, id=object_id)

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    relation_to_published = _object.relation_to_published
    if not _object.doi_label:
        _object.create_doi_label()

    # create a doi_batch_id
    salt = ""
    for i in range(5):
        salt = salt + random.choice(string.ascii_letters)
    salt = salt.encode('utf8')
    idsalt = str(_object)[:10]
    idsalt = idsalt.encode('utf8')
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    timestamp = timezone.now().strftime('%Y%m%d%H%M%S')
    doi_batch_id = hashlib.sha1(salt+idsalt).hexdigest()
    metadata_xml = (
        '<?xml version="1.0" encoding="UTF-8"?>\n'
        '<doi_batch version="4.4.1" xmlns="http://www.crossref.org/schema/4.4.1" '
        'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" '
        'xsi:schemaLocation="http://www.crossref.org/schema/4.4.1 '
        'http://www.crossref.org/shema/deposit/crossref4.4.1.xsd">\n'
        '<head>\n'
        '<doi_batch_id>' + str(doi_batch_id) + '</doi_batch_id>\n'
        '<timestamp>' + timestamp + '</timestamp>\n'
        '<depositor>\n'
        '<depositor_name>scipost</depositor_name>\n'
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        '<email_address>' + settings.CROSSREF_DEPOSIT_EMAIL + '</email_address>\n'
        '</depositor>\n'
        '<registrant>scipost</registrant>\n'
        '</head>\n'
    )
    if relation_to_published:
        metadata_xml += (
            '<body>\n'
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            '<peer_review stage="' + relation_to_published['stage'] + '">\n'
            metadata_xml += (
                '<anonymous sequence="first" contributor_role="'
                + relation_to_published['contributor_role'] + '"/>'
                '<person_name sequence="first" contributor_role="'
                + relation_to_published['contributor_role'] + '">'
                '<given_name>' + _object.author.user.first_name + '</given_name>'
                '<surname>' + _object.author.user.last_name + '</surname>'
                '</person_name>\n'
            )
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        if isinstance(_object, Publication):
            url_to_declare = 'https://scipost.org{}'.format(_object.get_absolute_url())
        else:
            url_to_declare = 'https://scipost.org/{}'.format(_object.doi_label)

        metadata_xml += (
            '</contributors>\n'
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            '<titles><title>' + relation_to_published['title'] + '</title></titles>\n'
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            '<review_date>'
            '<month>' + _object.date_submitted.strftime('%m') + '</month>'
            '<day>' + _object.date_submitted.strftime('%d') + '</day>'
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            '<year>' + _object.date_submitted.strftime('%Y') + '</year>'
            '</review_date>\n'
            '<program xmlns="http://www.crossref.org/relations.xsd">\n'
            '<related_item>'
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            '<description>' + relation_to_published['title'] + '</description>\n'
            '<inter_work_relation relationship-type="isReviewOf" identifier-type="doi">'
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            + relation_to_published['isReviewOfDOI'] + '</inter_work_relation></related_item>\n'
            '</program>'
            '<doi_data><doi>' + _object.doi_string + '</doi>\n'
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            '<resource>' + url_to_declare +
            '</resource></doi_data>\n'
            '</peer_review>\n'
            '</body>\n'
            '</doi_batch>\n'
        )
    else:
        metadata_xml += (
            '<body>\n'
            '<database>\n'
            '<database_metadata language="en">\n'
            '<titles><title>SciPost Reports and Comments</title></titles>\n'
            '</database_metadata>\n'
            '<dataset dataset_type="collection">\n'
            '<doi_data><doi>' + _object.doi_string + '</doi>\n'
            '<resource>https://scipost.org' + _object.get_absolute_url() +
            '</resource></doi_data>\n'
            '</dataset></database>\n'
            '</body></doi_batch>'

    if not settings.CROSSREF_DEBUG:
        # CAUTION: Debug is False, production goes for real deposit!!!
        url = 'http://doi.crossref.org/servlet/deposit'
    else:
        url = 'http://test.crossref.org/servlet/deposit'
    params = {
        'operation': 'doMDUpload',
        'login_id': settings.CROSSREF_LOGIN_ID,
        'login_passwd': settings.CROSSREF_LOGIN_PASSWORD,
        }
    files = {'fname': ('metadata.xml', metadata_xml, 'multipart/form-data')}
    r = requests.post(url, params=params, files=files)
    deposit = GenericDOIDeposit(content_type=ContentType.objects.get_for_model(_object),
                                object_id=object_id,
                                content_object=_object,
                                timestamp=timestamp,
                                doi_batch_id=doi_batch_id,
                                metadata_xml=metadata_xml,
                                deposition_date=timezone.now(),
                                response=r.text)
    deposit.save()
    context = {
        'response_headers': r.headers,
        'response_text': r.text,
    }
    return render(request, 'journals/generic_metadata_xml_deposit.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
def mark_generic_deposit_success(request, deposit_id, success):
    deposit = get_object_or_404(GenericDOIDeposit, pk=deposit_id)
    if success == '1':
        deposit.deposit_successful = True
        deposit.content_object.doideposit_needs_updating = False
        deposit.content_object.save()
    elif success == '0':
        deposit.deposit_successful = False
    deposit.save()
    if deposit.content_type.name == 'report':
        return redirect(reverse('journals:manage_report_metadata'))
    else:
        return redirect(reverse('journals:manage_comment_metadata'))


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
def email_object_made_citable(request, **kwargs):
    """
    This method sends an email to the author of a Report or a Comment,
    to notify that the object has been made citable (doi registered).
    """
    type_of_object = kwargs['type_of_object']
    object_id = int(kwargs['object_id'])

    if type_of_object == 'report':
        _object = get_object_or_404(Report, id=object_id)
    elif type_of_object == 'comment':
        _object = get_object_or_404(Comment, id=object_id)

    if type_of_object == 'report':
        JournalUtils.load({'report': _object, })
        JournalUtils.email_report_made_citable()
        return redirect(reverse('journals:manage_report_metadata'))
    else:
        JournalUtils.load({'comment': _object, })
        JournalUtils.email_comment_made_citable()
        return redirect(reverse('journals:manage_comment_metadata'))


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def report_detail(request, doi_label):
    report = get_object_or_404(Report.objects.accepted(), doi_label=doi_label)
    return redirect(report.get_absolute_url())


def comment_detail(request, doi_label):
    comment = get_object_or_404(Comment.objects.vetted().regular_comments(), doi_label=doi_label)
    return redirect(comment.get_absolute_url())


def author_reply_detail(request, doi_label):
    comment = get_object_or_404(Comment.objects.vetted().author_replies(), doi_label=doi_label)
    return redirect(comment.get_absolute_url())


def publication_detail(request, doi_label):
    publication = Publication.objects.get_published(doi_label=doi_label)
    journal = publication.in_issue.in_volume.in_journal

    context = {
        'publication': publication,
        'journal': journal
    return render(request, 'journals/publication_detail.html', context)


def publication_detail_pdf(request, doi_label):
    publication = Publication.objects.get_published(doi_label=doi_label)
    response = HttpResponse(publication.pdf_file.read(), content_type='application/pdf')
    response['Content-Disposition'] = ('filename='
                                       + publication.doi_label.replace('.', '_') + '.pdf')
    return response