views.py

import hashlib
import os
import random
import requests
import string
import xml.etree.ElementTree as ET

from django.core.urlresolvers import reverse
from django.conf import settings
from django.contrib import messages
from django.utils import timezone
from django.shortcuts import get_object_or_404, render, redirect
from django.db import transaction
from django.http import HttpResponse

from .exceptions import PaperNumberingError
from .helpers import paper_nr_string
from .models import Journal, Issue, Publication, UnregisteredAuthor
from .forms import FundingInfoForm, InitiatePublicationForm, ValidatePublicationForm,\
                   UnregisteredAuthorForm, CreateMetadataXMLForm, CitationListBibitemsForm
from .utils import JournalUtils

from submissions.models import Submission
from scipost.models import Contributor

from guardian.decorators import permission_required


############
# Journals
############

def landing_page(request, doi_label):
    journal = get_object_or_404(Journal, doi_label=doi_label)

    current_issue = Issue.objects.published(
        in_volume__in_journal=journal,
        start_date__lte=timezone.now(),
        until_date__gte=timezone.now()).order_by('-until_date').first()
    latest_issue = Issue.objects.published(
        in_volume__in_journal=journal,
        until_date__lte=timezone.now()).order_by('-until_date').first()

    prev_issue = None
    if current_issue:
        prev_issue = (Issue.objects.published(in_volume__in_journal=journal,
                                              start_date__lt=current_issue.start_date)
                                   .order_by('start_date').last())

    context = {
        'current_issue': current_issue,
        'latest_issue': latest_issue,
        'prev_issue': prev_issue,
        'journal': journal
    }
    return render(request, 'journals/journal_landing_page.html', context)


def issues(request, doi_label):
    journal = get_object_or_404(Journal, doi_label=doi_label)

    issues = Issue.objects.published(in_volume__in_journal=journal).order_by('-until_date')
    context = {
        'issues': issues,
        'journal': journal
    }
    return render(request, 'journals/journal_issues.html', context)


def recent(request, doi_label):
    """
    Display page for the most recent 20 publications in SciPost Physics.
    """
    journal = get_object_or_404(Journal, doi_label=doi_label)
    recent_papers = Publication.objects.published(
        in_issue__in_volume__in_journal=journal).order_by('-publication_date')[:20]
    context = {
        'recent_papers': recent_papers,
        'journal': journal,
    }
    return render(request, 'journals/journal_recent.html', context)


def accepted(request, doi_label):
    """
    Display page for submissions to SciPost Physics which
    have been accepted but are not yet published.
    """
    journal = get_object_or_404(Journal, doi_label=doi_label)
    accepted_SP_submissions = Submission.objects.filter(
        submitted_to_journal=journal.name, status='accepted'
    ).order_by('-latest_activity')
    context = {
        'accepted_SP_submissions': accepted_SP_submissions,
        'journal': journal
    }
    return render(request, 'journals/journal_accepted.html', context)


def info_for_authors(request, doi_label):
    journal = get_object_or_404(Journal, doi_label=doi_label)
    context = {
        'journal': journal
    }
    return render(request, 'journals/%s_info_for_authors.html' % doi_label, context)


def about(request, doi_label):
    journal = get_object_or_404(Journal, doi_label=doi_label)
    context = {
        'journal': journal
    }
    return render(request, 'journals/%s_about.html' % doi_label, context)


def issue_detail(request, doi_label):
    issue = Issue.objects.get_published(doi_label=doi_label)
    journal = issue.in_volume.in_journal

    papers = issue.publication_set.order_by('paper_nr')
    next_issue = (Issue.objects.published(journal=journal,
                                          start_date__gt=issue.start_date)
                               .order_by('start_date').first())
    prev_issue = (Issue.objects.published(in_volume__in_journal=journal,
                                          start_date__lt=issue.start_date)
                               .order_by('start_date').last())
    context = {
        'issue': issue,
        'prev_issue': prev_issue,
        'next_issue': next_issue,
        'papers': papers,
        'journal': journal
    }
    return render(request, 'journals/journal_issue_detail.html', context)


#######################
# Publication process #
#######################

def upload_proofs(request):
    """
    TODO
    Called by a member of the Production Team.
    Upload the production version .pdf of a submission.
    """
    return render(request, 'journals/upload_proofs.html')


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def initiate_publication(request):
    """
    Called by an Editorial Administrator.
    Publish the manuscript after proofs have been accepted.
    This method prefills a ValidatePublicationForm for further
    processing (verification in validate_publication method).
    """
    if request.method == 'POST':
        initiate_publication_form = InitiatePublicationForm(request.POST)
        if initiate_publication_form.is_valid():
            submission = get_object_or_404(Submission, pk=initiate_publication_form.cleaned_data[
                                                'accepted_submission'].id)
            current_issue = get_object_or_404(Issue, pk=initiate_publication_form.cleaned_data[
                                                'to_be_issued_in'].id)

            # Determine next available paper number:
            papers_in_current_volume = Publication.objects.filter(
                in_issue__in_volume=current_issue.in_volume)
            paper_nr = 1
            while papers_in_current_volume.filter(paper_nr=paper_nr).exists():
                paper_nr += 1
                if paper_nr > 999:
                    raise PaperNumberingError(paper_nr)
            doi_label = (
                current_issue.in_volume.in_journal.name
                + '.' + str(current_issue.in_volume.number)
                + '.' + str(current_issue.number) + '.' + paper_nr_string(paper_nr)
            )
            doi_string = '10.21468/' + doi_label
            BiBTeX_entry = (
                '@Article{' + doi_label + ',\n'
                '\ttitle={{' + submission.title + '}},\n'
                '\tauthor={' + submission.author_list.replace(',', ' and') + '},\n'
                '\tjournal={'
                + current_issue.in_volume.in_journal.get_abbreviation_citation()
                + '},\n'
                '\tvolume={' + str(current_issue.in_volume.number) + '},\n'
                '\tissue={' + str(current_issue.number) + '},\n'
                '\tpages={' + paper_nr_string(paper_nr) + '},\n'
                '\tyear={' + current_issue.until_date.strftime('%Y') + '},\n'
                '\tpublisher={SciPost},\n'
                '\tdoi={' + doi_string + '},\n'
                '\turl={https://scipost.org/' + doi_string + '},\n'
                '}\n'
            )
            initial = {
                'accepted_submission': submission,
                'in_issue': current_issue,
                'paper_nr': paper_nr,
                'discipline': submission.discipline,
                'domain': submission.domain,
                'subject_area': submission.subject_area,
                'secondary_areas': submission.secondary_areas,
                'title': submission.title,
                'author_list': submission.author_list,
                'abstract': submission.abstract,
                'BiBTeX_entry': BiBTeX_entry,
                'doi_label': doi_label,
                'submission_date': initiate_publication_form.cleaned_data['original_submission_date'],
                'acceptance_date': initiate_publication_form.cleaned_data['acceptance_date'],
                'publication_date': timezone.now(),
                'latest_activity': timezone.now(),
            }
            validate_publication_form = ValidatePublicationForm(initial=initial)
            context = {'validate_publication_form': validate_publication_form, }
            return render(request, 'journals/validate_publication.html', context)
        else:
            errormessage = 'The form was not filled validly.'
            context = {'initiate_publication_form': initiate_publication_form,
                       'errormessage': errormessage}
            return render(request, 'journals/initiate_publication.html', context)
    else:
        initiate_publication_form = InitiatePublicationForm()
    context = {'initiate_publication_form': initiate_publication_form}
    return render(request, 'journals/initiate_publication.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def validate_publication(request):
    """
    This creates a Publication instance from the ValidatePublicationForm,
    pre-filled by the initiate_publication method above.
    """
    # TODO: move from uploads to Journal folder
    # TODO: create metadata
    # TODO: set DOI, register with Crossref
    # TODO: add funding info
    context = {}
    validate_publication_form = ValidatePublicationForm(request.POST or None,
                                                        request.FILES or None)
    if validate_publication_form.is_valid():
        publication = validate_publication_form.save()
        # Fill in remaining data
        publication.pdf_file = request.FILES['pdf_file']
        submission = publication.accepted_submission
        publication.authors.add(*submission.authors.all())
        publication.authors_claims.add(*submission.authors_claims.all())
        publication.authors_false_claims.add(*submission.authors_false_claims.all())
        publication.save()
        # Move file to final location
        initial_path = publication.pdf_file.path
        new_dir = (settings.MEDIA_ROOT + publication.in_issue.path + '/'
                   + publication.get_paper_nr())
        new_path = new_dir + '/' + publication.doi_label.replace('.', '_') + '.pdf'
        os.makedirs(new_dir)
        os.rename(initial_path, new_path)
        publication.pdf_file.name = new_path
        publication.save()
        # Mark the submission as having been published:
        publication.accepted_submission.published_as = publication
        publication.accepted_submission.status = 'published'
        publication.accepted_submission.save()
        # TODO: Create a Commentary Page
        # Email authors
        JournalUtils.load({'publication': publication})
        JournalUtils.send_authors_paper_published_email()
        ack_header = 'The publication has been validated.'
        context['ack_header'] = ack_header
        return render(request, 'scipost/acknowledgement.html', context)
    else:
        context['errormessage'] = 'The form was invalid.'

    context['validate_publication_form'] = validate_publication_form
    return render(request, 'journals/validate_publication.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def mark_first_author(request, publication_id, contributor_id):
    publication = get_object_or_404(Publication, id=publication_id)
    contributor = get_object_or_404(Contributor, id=contributor_id)
    publication.first_author = contributor
    publication.first_author_unregistered = None
    publication.save()
    return redirect(publication.get_absolute_url())


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def mark_first_author_unregistered(request, publication_id, unregistered_author_id):
    publication = get_object_or_404(Publication, id=publication_id)
    unregistered_author = get_object_or_404(UnregisteredAuthor, id=unregistered_author_id)
    publication.first_author = None
    publication.first_author_unregistered = unregistered_author
    publication.save()
    return redirect(publication.get_absolute_url())


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def add_author(request, publication_id, contributor_id=None, unregistered_author_id=None):
    """
    If not all authors are registered Contributors or if they have not
    all claimed authorship, this method allows editorial administrators
    to associated them to the publication.
    This is important for the Crossref metadata, in which all authors must appear.
    """
    publication = get_object_or_404(Publication, id=publication_id)
    if contributor_id:
        contributor = get_object_or_404(Contributor, id=contributor_id)
        publication.authors.add(contributor)
        publication.save()
        return redirect(publication.get_absolute_url())

    if request.method == 'POST':
        form = UnregisteredAuthorForm(request.POST)
        if form.is_valid():
            contributors_found = Contributor.objects.filter(
                user__last_name__icontains=form.cleaned_data['last_name'])
            unregistered_authors_found = UnregisteredAuthor.objects.filter(
                last_name__icontains=form.cleaned_data['last_name'])
            new_unreg_author_form = UnregisteredAuthorForm(
                initial={'first_name': form.cleaned_data['first_name'],
                         'last_name': form.cleaned_data['last_name'], })
        else:
            errormessage = 'Please fill in the form properly'
            return render(request, 'scipost/error.html', context={'errormessage': errormessage})
    else:
        form = UnregisteredAuthorForm()
        contributors_found = None
        unregistered_authors_found = None
        new_unreg_author_form = UnregisteredAuthorForm()
    context = {'publication': publication,
               'contributors_found': contributors_found,
               'unregistered_authors_found': unregistered_authors_found,
               'form': form,
               'new_unreg_author_form': new_unreg_author_form, }
    return render(request, 'journals/add_author.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def add_unregistered_author(request, publication_id, unregistered_author_id):
    publication = get_object_or_404(Publication, id=publication_id)
    unregistered_author = get_object_or_404(UnregisteredAuthor, id=unregistered_author_id)
    publication.unregistered_authors.add(unregistered_author)
    publication.save()
    return redirect(publication.get_absolute_url())


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def add_new_unreg_author(request, publication_id):
    publication = get_object_or_404(Publication, id=publication_id)
    if request.method == 'POST':
        new_unreg_author_form = UnregisteredAuthorForm(request.POST)
        if new_unreg_author_form.is_valid():
            new_unreg_author = UnregisteredAuthor(
                first_name=new_unreg_author_form.cleaned_data['first_name'],
                last_name=new_unreg_author_form.cleaned_data['last_name'],)
            new_unreg_author.save()
            publication.authors_unregistered.add(new_unreg_author)
            return redirect(publication.get_absolute_url())
    errormessage = 'Method add_new_unreg_author can only be called with POST.'
    return render(request, 'scipost/error.html', context={'errormessage': errormessage})


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def create_citation_list_metadata(request, doi_label):
    """
    Called by an Editorial Administrator.
    This populates the citation_list dictionary entry
    in the metadata field in a Publication instance.
    """
    publication = get_object_or_404(Publication, doi_label=doi_label)
    if request.method == 'POST':
        bibitems_form = CitationListBibitemsForm(request.POST, request.FILES)
        if bibitems_form.is_valid():
            publication.metadata['citation_list'] = []
            entries_list = bibitems_form.cleaned_data['latex_bibitems'].split('\doi{')
            nentries = 1
            for entry in entries_list[1:]:  # drop first bit before first \doi{
                publication.metadata['citation_list'].append(
                    {'key': 'ref' + str(nentries),
                     'doi': entry.partition('}')[0], }
                )
                nentries += 1
            publication.save()
    bibitems_form = CitationListBibitemsForm()
    context = {
        'publication': publication,
        'bibitems_form': bibitems_form,
    }
    if request.method == 'POST':
        context['citation_list'] = publication.metadata['citation_list']
    return render(request, 'journals/create_citation_list_metadata.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def create_funding_info_metadata(request, doi_label):
    """
    Called by an Editorial Administrator.
    This populates the funding_info dictionary entry
    in the metadata field in a Publication instance.
    """
    publication = get_object_or_404(Publication, doi_label=doi_label)
    if request.method == 'POST':
        funding_info_form = FundingInfoForm(request.POST)
        if funding_info_form.is_valid():
            publication.metadata['funding_statement'] = funding_info_form.cleaned_data[
                                                            'funding_statement']
            publication.save()

    initial = {'funding_statement': '', }
    funding_statement = ''
    try:
        initial['funding_statement'] = publication.metadata['funding_statement']
        funding_statement = initial['funding_statement']
    except KeyError:
        pass
    context = {'publication': publication,
               'funding_info_form': FundingInfoForm(initial=initial),
               'funding_statement': funding_statement, }

    return render(request, 'journals/create_funding_info_metadata.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def create_metadata_xml(request, doi_label):
    """
    To be called by an EdAdmin after the citation_list,
    funding_info entries have been filled.
    Populates the metadata_xml field of a Publication instance.
    The contents can then be sent to Crossref for registration.
    """
    publication = get_object_or_404(Publication, doi_label=doi_label)

    if request.method == 'POST':
        create_metadata_xml_form = CreateMetadataXMLForm(request.POST)
        if create_metadata_xml_form.is_valid():
            publication.metadata_xml = create_metadata_xml_form.cleaned_data['metadata_xml']
            publication.save()
            return redirect(publication.get_absolute_url())

    # create a doi_batch_id
    salt = ""
    for i in range(5):
        salt = salt + random.choice(string.ascii_letters)
    salt = salt.encode('utf8')
    idsalt = publication.title[:10]
    idsalt = idsalt.encode('utf8')
    doi_batch_id = hashlib.sha1(salt+idsalt).hexdigest()

    initial = {'metadata_xml': ''}
    initial['metadata_xml'] += (
        '<?xml version="1.0" encoding="UTF-8"?>\n'
        '<doi_batch version="4.3.7" xmlns="http://www.crossref.org/schema/4.3.7" '
        'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" '
        'xsi:schemaLocation="http://www.crossref.org/schema/4.3.7 '
        'http://www.crossref.org/shema/deposit/crossref4.3.7.xsd">\n'
        '<head>\n'
        '<doi_batch_id>' + str(doi_batch_id) + '</doi_batch_id>\n'
        '<timestamp>' + timezone.now().strftime('%Y%m%d%H%M%S') + '</timestamp>\n'
        '<depositor>\n'
        '<depositor_name>scipost</depositor_name>\n'
        '<email_address>admin@scipost.org</email_address>\n'
        '</depositor>\n'
        '<registrant>scipost</registrant>\n'
        '</head>\n'
        '<body>\n'
        '<journal>\n'
        '<journal_metadata>\n'
        '<full_title>' + publication.in_issue.in_volume.in_journal.get_name_display() + '</full_title>\n'
        '<abbrev_title>'
        + publication.in_issue.in_volume.in_journal.get_abbreviation_citation() +
        '</abbrev_title>\n'
        '<issn>' + publication.in_issue.in_volume.in_journal.issn + '</issn>\n'
        '<doi_data>\n'
        '<doi>' + publication.in_issue.in_volume.in_journal.doi_string + '</doi>\n'
        '<resource>https://scipost.org/'
        + publication.in_issue.in_volume.in_journal.doi_string + '</resource>\n'
        '</doi_data>\n'
        '</journal_metadata>\n'
        '<journal_issue>\n'
        '<publication_date media_type=\'online\'>\n'
        '<year>' + publication.publication_date.strftime('%Y') + '</year>\n'
        '</publication_date>\n'
        '<journal_volume>\n'
        '<volume>' + str(publication.in_issue.in_volume.number) + '</volume>\n'
        '</journal_volume>\n'
        '<issue>' + str(publication.in_issue.number) + '</issue>\n'
        '</journal_issue>\n'
        '<journal_article publication_type=\'full_text\'>\n'
        '<titles><title>' + publication.title + '</title></titles>\n'
        '<contributors>\n'
    )
    # Precondition: all authors MUST be listed in authors field of publication instance,
    # this to be checked by EdAdmin before publishing.
    for author in publication.authors.all():
        if author == publication.first_author:
            initial['metadata_xml'] += (
                '<person_name sequence=\'first\' contributor_role=\'author\'> '
                '<given_name>' + author.user.first_name + '</given_name> '
                '<surname>' + author.user.last_name + '</surname> '
            )
        else:
            initial['metadata_xml'] += (
                '<person_name sequence=\'additional\' contributor_role=\'author\'> '
                '<given_name>' + author.user.first_name + '</given_name> '
                '<surname>' + author.user.last_name + '</surname> '
            )
        if author.orcid_id:
            initial['metadata_xml'] += '<ORCID>http://orcid.org/' + author.orcid_id + '</ORCID>'
        initial['metadata_xml'] += '</person_name>\n'

    for author_unreg in publication.authors_unregistered.all():
        if author_unreg == publication.first_author_unregistered:
            initial['metadata_xml'] += (
                '<person_name sequence=\'first\' contributor_role=\'author\'> '
                '<given_name>' + author_unreg.first_name + '</given_name> '
                '<surname>' + author_unreg.last_name + '</surname> '
            )
        else:
            initial['metadata_xml'] += (
                '<person_name sequence=\'additional\' contributor_role=\'author\'> '
                '<given_name>' + author_unreg.first_name + '</given_name> '
                '<surname>' + author_unreg.last_name + '</surname> '
            )
        initial['metadata_xml'] += '</person_name>\n'
    initial['metadata_xml'] += '</contributors>\n'

    initial['metadata_xml'] += (
        '<publication_date media_type=\'online\'>\n'
        '<month>' + publication.publication_date.strftime('%m') + '</month>'
        '<day>' + publication.publication_date.strftime('%d') + '</day>'
        '<year>' + publication.publication_date.strftime('%Y') + '</year>'
        '</publication_date>\n'
        '<publisher_item><item_number item_number_type="article_number">'
        + paper_nr_string(publication.paper_nr) +
        '</item_number></publisher_item>\n'
        '<doi_data>\n'
        '<doi>' + publication.doi_string + '</doi>\n'
        '<resource>https://scipost.org/' + publication.doi_string + '</resource>\n'
        '<collection property="crawler-based">\n'
        '<item crawler="iParadigms">\n'
        '<resource>https://scipost.org/'
        + publication.doi_string + '/pdf</resource>\n'
        '</item></collection>\n'
        '</doi_data>\n'
    )
    try:
        if publication.metadata['citation_list']:
            initial['metadata_xml'] += '<citation_list>\n'
            for ref in publication.metadata['citation_list']:
                initial['metadata_xml'] += (
                    '<citation key="' + ref['key'] + '">'
                    '<doi>' + ref['doi'] + '</doi>'
                    '</citation>\n'
                )
        initial['metadata_xml'] += '</citation_list>\n'
    except KeyError:
        pass
    initial['metadata_xml'] += (
        '</journal_article>\n'
        '</journal>\n'
    )
    initial['metadata_xml'] += '</body>\n</doi_batch>'
    publication.save()

    context = {'publication': publication,
               'create_metadata_xml_form': CreateMetadataXMLForm(initial=initial),
               }
    return render(request, 'journals/create_metadata_xml.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def metadata_xml_deposit(request, doi_label, option='test'):
    """
    Crossref metadata deposit.
    If test==True, test the metadata_xml using the Crossref test server.
    Makes use of the python requests module.
    """
    publication = get_object_or_404(Publication, doi_label=doi_label)
    if option == 'deposit':
        url = 'http://doi.crossref.org/servlet/deposit'
    elif option == 'test':
        url = 'http://test.crossref.org/servlet/deposit'
    else:
        errormessage = 'metadata_xml_deposit can only be called with options test or deposit'
        return render(request, 'scipost/error.html', context={'errormessage': errormessage})

    params = {
        'operation': 'doMDUpload',
        'login_id': settings.CROSSREF_LOGIN_ID,
        'login_passwd': settings.CROSSREF_LOGIN_PASSWORD,
        }
    files = {'fname': ('metadata.xml', publication.metadata_xml, 'multipart/form-data')}
    r = requests.post(url,
                      params=params,
                      files=files,
                      )
    response_headers = r.headers
    response_text = r.text
    context = {
        'option': option,
        'publication': publication,
        'response_headers': response_headers,
        'response_text': response_text,
    }
    return render(request, 'journals/metadata_xml_deposit.html', context)


@permission_required('scipost.can_publish_accepted_submission', return_403=True)
@transaction.atomic
def harvest_citedby_links(request, doi_label):
    publication = get_object_or_404(Publication, doi_label=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 = publication.title[:10]
    idsalt = idsalt.encode('utf8')
    doi_batch_id = hashlib.sha1(salt+idsalt).hexdigest()
    query_xml = ('<?xml version = "1.0" encoding="UTF-8"?>'
                 '<query_batch version="2.0" xmlns = "http://www.crossref.org/qschema/2.0"'
                 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"'
                 'xsi:schemaLocation="http://www.crossref.org/qschema/2.0 '
                 'http://www.crossref.org/qschema/crossref_query_input2.0.xsd">'
                 '<head>'
                 '<email_address>admin@scipost.org</email_address>'
                 '<doi_batch_id>' + str(doi_batch_id) + '</doi_batch_id>'
                 '</head>'
                 '<body>'
                 '<fl_query alert="false">'
                 '<doi>' + publication.doi_string + '</doi>'
                 '</fl_query>'
                 '</body>'
                 '</query_batch>')
    url = 'http://doi.crossref.org/servlet/getForwardLinks'
    params = {'usr': settings.CROSSREF_LOGIN_ID,
              'pwd': settings.CROSSREF_LOGIN_PASSWORD,
              'qdata': query_xml,
              'doi': publication.doi_string, }
    r = requests.post(url, params=params,)
    if r.status_code == 401:
        messages.warning(request, ('<h3>Crossref credentials are invalid.</h3>'
                                   'Please contact the SciPost Admin.'))
        return redirect(publication.get_absolute_url())
    response_headers = r.headers
    response_text = r.text
    response_deserialized = ET.fromstring(r.text)
    prefix = '{http://www.crossref.org/qrschema/2.0}'
    citations = []
    for link in response_deserialized.iter(prefix + 'forward_link'):
        doi = link.find(prefix + 'journal_cite').find(prefix + 'doi').text
        article_title = link.find(prefix + 'journal_cite').find(prefix + 'article_title').text
        journal_abbreviation = link.find(prefix + 'journal_cite').find(
            prefix + 'journal_abbreviation').text
        try:
            volume = link.find(prefix + 'journal_cite').find(prefix + 'volume').text
        except AttributeError:
            volume = None
        try:
            first_page = link.find(prefix + 'journal_cite').find(prefix + 'first_page').text
        except:
            first_page = None
        try:
            item_number = link.find(prefix + 'journal_cite').find(prefix + 'item_number').text
        except:
            item_number = None
        multiauthors = False
        for author in link.find(prefix + 'journal_cite').find(
                prefix + 'contributors').iter(prefix + 'contributor'):
            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,
                          'year': year, })
    publication.citedby = citations
    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)


###########
# Viewing #
###########

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