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snapshot_context.py
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	# Copyright (C) 2018 The Software Heritage developers
	# See the AUTHORS file at the top-level directory of this distribution
	# License: GNU Affero General Public License version 3, or any later version
	# See top-level LICENSE file for more information

	# Utility module implementing Django views for browsing the SWH archive
	# in a snapshot context.
	# Its purpose is to factorize code for the views reachable from the
	# /origin/.* and /snapshot/.* endpoints.

	from django.shortcuts import render, redirect
	from django.utils.safestring import mark_safe
	from django.template.defaultfilters import filesizeformat

	from swh.web.browse.utils import (
	get_snapshot_context, get_directory_entries, gen_directory_link,
	gen_revision_link, request_content, gen_content_link,
	prepare_content_for_display, content_display_max_size,
	prepare_revision_log_for_display, gen_snapshot_directory_link,
	gen_revision_log_link, gen_link, get_readme_to_display,
	get_swh_persistent_ids
	)

	from swh.web.common import service
	from swh.web.common.exc import (
	handle_view_exception, NotFoundExc
	)
	from swh.web.common.utils import (
	reverse, gen_path_info, format_utc_iso_date
	)


	def _get_branch(branches, branch_name):
	"""
	Utility function to get a specific branch from a branches list.
	Its purpose is to get the default HEAD branch as some SWH origin
	(e.g those with svn type) does not have it. In that latter case, check
	if there is a master branch instead and returns it.
	"""
	filtered_branches = \
	[b for b in branches if b['name'].endswith(branch_name)]
	if len(filtered_branches) > 0:
	return filtered_branches[0]
	elif branch_name == 'HEAD':
	filtered_branches = \
	[b for b in branches if b['name'].endswith('master')]
	if len(filtered_branches) > 0:
	return filtered_branches[0]
	elif len(branches) > 0:
	return branches[0]
	return None


	def _get_release(releases, release_name):
	"""
	Utility function to get a specific release from a releases list.
	Returns None if the release can not be found in the list.
	"""
	filtered_releases = \
	[r for r in releases if r['name'] == release_name]
	if len(filtered_releases) > 0:
	return filtered_releases[0]
	else:
	return None


	def _branch_not_found(branch_type, branch, branches, snapshot_id=None,
	origin_info=None, timestamp=None, visit_id=None):
	"""
	Utility function to raise an exception when a specified branch/release
	can not be found.
	"""
	if branch_type == 'branch':
	branch_type = 'Branch'
	branch_type_plural = 'branches'
	else:
	branch_type = 'Release'
	branch_type_plural = 'releases'

	if snapshot_id and len(branches) == 0:
	msg = 'Snapshot with id %s has an empty list' \
	' of %s!' % (snapshot_id, branch_type_plural)
	elif snapshot_id:
	msg = '%s %s for snapshot with id %s' \
	' not found!' % (branch_type, branch, snapshot_id)
	elif visit_id and len(branches) == 0:
	msg = 'Origin with type %s and url %s' \
	' for visit with id %s has an empty list' \
	' of %s!' % (origin_info['type'], origin_info['url'], visit_id,
	branch_type_plural)
	elif visit_id:
	msg = '%s %s associated to visit with' \
	' id %s for origin with type %s and url %s' \
	' not found!' % (branch_type, branch, visit_id,
	origin_info['type'], origin_info['url'])
	elif len(branches) == 0:
	msg = 'Origin with type %s and url %s' \
	' for visit with timestamp %s has an empty list' \
	' of %s!' % (origin_info['type'], origin_info['url'],
	timestamp, branch_type_plural)
	else:
	msg = '%s %s associated to visit with' \
	' timestamp %s for origin with type %s' \
	' and url %s not found!' % (branch_type, branch, timestamp,
	origin_info['type'],
	origin_info['url'])
	raise NotFoundExc(msg)


	def _process_snapshot_request(request, snapshot_id=None, origin_type=None,
	origin_url=None, timestamp=None, path=None,
	browse_context='directory'):
	"""
	Utility function to perform common input request processing
	for snapshot context views.
	"""

	visit_id = request.GET.get('visit_id', None)

	snapshot_context = get_snapshot_context(snapshot_id, origin_type,
	origin_url, timestamp, visit_id)

	swh_type = snapshot_context['swh_type']
	origin_info = snapshot_context['origin_info']
	branches = snapshot_context['branches']
	releases = snapshot_context['releases']
	url_args = snapshot_context['url_args']
	query_params = snapshot_context['query_params']

	browse_view_name = 'browse-' + swh_type + '-' + browse_context

	for b in branches:
	branch_url_args = dict(url_args)
	branch_query_params = dict(query_params)
	branch_query_params['branch'] = b['name']
	if path:
	b['path'] = path
	branch_url_args['path'] = path
	b['url'] = reverse(browse_view_name,
	kwargs=branch_url_args,
	query_params=branch_query_params)

	for r in releases:
	release_url_args = dict(url_args)
	release_query_params = dict(query_params)
	release_query_params['release'] = r['name']
	if path:
	r['path'] = path
	release_url_args['path'] = path
	r['url'] = reverse(browse_view_name,
	kwargs=release_url_args,
	query_params=release_query_params)

	root_sha1_git = None
	revision_id = request.GET.get('revision', None)
	release_name = request.GET.get('release', None)
	release_id = None
	branch_name = None

	if revision_id:
	revision = service.lookup_revision(revision_id)
	root_sha1_git = revision['directory']
	branches.append({'name': revision_id,
	'revision': revision_id,
	'directory': root_sha1_git,
	'url': None})
	branch_name = revision_id
	query_params['revision'] = revision_id
	elif release_name:
	release = _get_release(releases, release_name)
	if release:
	root_sha1_git = release['directory']
	revision_id = release['target']
	release_id = release['id']
	query_params['release'] = release_name
	else:
	_branch_not_found("release", release_name, releases, snapshot_id,
	origin_info, timestamp, visit_id)
	else:
	branch_name = request.GET.get('branch', None)
	if branch_name:
	query_params['branch'] = branch_name
	branch = _get_branch(branches, branch_name or 'HEAD')
	if branch:
	branch_name = branch['name']
	root_sha1_git = branch['directory']
	revision_id = branch['revision']

	else:
	_branch_not_found("branch", branch_name, branches, snapshot_id,
	origin_info, timestamp, visit_id)

	snapshot_context['query_params'] = query_params
	snapshot_context['root_sha1_git'] = root_sha1_git
	snapshot_context['revision_id'] = revision_id
	snapshot_context['branch'] = branch_name
	snapshot_context['release'] = release_name
	snapshot_context['release_id'] = release_id

	return snapshot_context


	def browse_snapshot_directory(request, snapshot_id=None, origin_type=None,
	origin_url=None, timestamp=None, path=None):
	"""
	Django view implementation for browsing a directory in a snapshot context.
	"""
	try:

	snapshot_context = _process_snapshot_request(request, snapshot_id,
	origin_type, origin_url,
	timestamp, path,
	browse_context='directory') # noqa

	root_sha1_git = snapshot_context['root_sha1_git']
	sha1_git = root_sha1_git
	if path:
	dir_info = service.lookup_directory_with_path(root_sha1_git, path)
	# some readme files can reference assets reachable from the
	# browsed directory, handle that special case in order to
	# correctly displayed them
	if dir_info and dir_info['type'] == 'file':
	file_raw_url = reverse(
	'browse-content-raw',
	kwargs={'query_string': dir_info['checksums']['sha1']})
	return redirect(file_raw_url)
	sha1_git = dir_info['target']

	dirs, files = get_directory_entries(sha1_git)

	except Exception as exc:
	return handle_view_exception(request, exc)

	swh_type = snapshot_context['swh_type']
	origin_info = snapshot_context['origin_info']
	visit_info = snapshot_context['visit_info']
	url_args = snapshot_context['url_args']
	query_params = snapshot_context['query_params']
	revision_id = snapshot_context['revision_id']
	snapshot_id = snapshot_context['snapshot_id']

	path_info = gen_path_info(path)

	browse_view_name = 'browse-' + swh_type + '-directory'

	breadcrumbs = []
	breadcrumbs.append({'name': root_sha1_git[:7],
	'url': reverse(browse_view_name,
	kwargs=url_args,
	query_params=query_params)})
	for pi in path_info:
	bc_url_args = dict(url_args)
	bc_url_args['path'] = pi['path']
	breadcrumbs.append({'name': pi['name'],
	'url': reverse(browse_view_name,
	kwargs=bc_url_args,
	query_params=query_params)})

	path = '' if path is None else (path + '/')

	for d in dirs:
	bc_url_args = dict(url_args)
	bc_url_args['path'] = path + d['name']
	d['url'] = reverse(browse_view_name,
	kwargs=bc_url_args,
	query_params=query_params)

	sum_file_sizes = 0

	readmes = {}

	browse_view_name = 'browse-' + swh_type + '-content'

	for f in files:
	bc_url_args = dict(url_args)
	bc_url_args['path'] = path + f['name']
	f['url'] = reverse(browse_view_name,
	kwargs=bc_url_args,
	query_params=query_params)
	sum_file_sizes += f['length']
	f['length'] = filesizeformat(f['length'])
	if f['name'].lower().startswith('readme'):
	readmes[f['name']] = f['checksums']['sha1']

	readme_name, readme_url, readme_html = get_readme_to_display(readmes)

	browse_view_name = 'browse-' + swh_type + '-log'

	history_url = reverse(browse_view_name,
	kwargs=url_args,
	query_params=query_params)

	sum_file_sizes = filesizeformat(sum_file_sizes)

	browse_dir_link = \
	gen_directory_link(sha1_git, link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})

	browse_rev_link = \
	gen_revision_link(revision_id,
	snapshot_context=snapshot_context,
	link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})

	dir_metadata = {'id': sha1_git,
	'context-independent directory': browse_dir_link,
	'number of regular files': len(files),
	'number of subdirectories': len(dirs),
	'sum of regular file sizes': sum_file_sizes,
	'path': '/' + path,
	'revision id': revision_id,
	'revision': browse_rev_link,
	'snapshot id': snapshot_id}

	if origin_info:
	dir_metadata['origin id'] = origin_info['id']
	dir_metadata['origin type'] = origin_info['type']
	dir_metadata['origin url'] = origin_info['url']
	dir_metadata['origin visit date'] = format_utc_iso_date(visit_info['date']) # noqa
	dir_metadata['origin visit id'] = visit_info['visit']
	snapshot_context_url = reverse('browse-snapshot-directory',
	kwargs={'snapshot_id': snapshot_id},
	query_params=request.GET)
	browse_snapshot_link = \
	gen_link(snapshot_context_url, link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})
	dir_metadata['snapshot context'] = browse_snapshot_link

	vault_cooking = {
	'directory_context': True,
	'directory_id': sha1_git,
	'revision_context': True,
	'revision_id': revision_id
	}

	swh_objects = [{'type': 'directory',
	'id': sha1_git},
	{'type': 'revision',
	'id': revision_id},
	{'type': 'snapshot',
	'id': snapshot_id}]

	release_id = snapshot_context['release_id']
	if release_id:
	swh_objects.append({'type': 'release',
	'id': release_id})

	swh_ids = get_swh_persistent_ids(swh_objects, snapshot_context)

	dir_path = '/'.join([bc['name'] for bc in breadcrumbs]) + '/'
	context_found = 'snapshot: %s' % snapshot_context['snapshot_id']
	if origin_info:
	context_found = 'origin: %s' % origin_info['url']
	heading = 'Directory - %s - %s - %s' %\
	(dir_path, snapshot_context['branch'], context_found)

	return render(request, 'directory.html',
	{'heading': heading,
	'swh_object_name': 'Directory',
	'swh_object_metadata': dir_metadata,
	'dirs': dirs,
	'files': files,
	'breadcrumbs': breadcrumbs,
	'top_right_link': history_url,
	'top_right_link_text': mark_safe(
	'<i class="fa fa-history fa-fw" aria-hidden="true"></i>'
	'History'
	),
	'readme_name': readme_name,
	'readme_url': readme_url,
	'readme_html': readme_html,
	'snapshot_context': snapshot_context,
	'vault_cooking': vault_cooking,
	'show_actions_menu': True,
	'swh_ids': swh_ids})


	def browse_snapshot_content(request, snapshot_id=None, origin_type=None,
	origin_url=None, timestamp=None, path=None):
	"""
	Django view implementation for browsing a content in a snapshot context.
	"""
	try:

	snapshot_context = _process_snapshot_request(request, snapshot_id,
	origin_type, origin_url,
	timestamp, path,
	browse_context='content')

	root_sha1_git = snapshot_context['root_sha1_git']
	content_info = service.lookup_directory_with_path(root_sha1_git, path)
	sha1_git = content_info['target']
	query_string = 'sha1_git:' + sha1_git
	content_data = request_content(query_string)

	except Exception as exc:
	return handle_view_exception(request, exc)

	swh_type = snapshot_context['swh_type']
	url_args = snapshot_context['url_args']
	query_params = snapshot_context['query_params']
	revision_id = snapshot_context['revision_id']
	origin_info = snapshot_context['origin_info']
	visit_info = snapshot_context['visit_info']
	snapshot_id = snapshot_context['snapshot_id']

	content = None
	language = None
	if content_data['raw_data'] is not None:
	content_display_data = prepare_content_for_display(
	content_data['raw_data'], content_data['mimetype'], path)
	content = content_display_data['content_data']
	language = content_display_data['language']

	filename = None
	path_info = None

	browse_view_name = 'browse-' + swh_type + '-directory'

	breadcrumbs = []

	split_path = path.split('/')
	filename = split_path[-1]
	path_info = gen_path_info(path[:-len(filename)])
	breadcrumbs.append({'name': root_sha1_git[:7],
	'url': reverse(browse_view_name,
	kwargs=url_args,
	query_params=query_params)})
	for pi in path_info:
	bc_url_args = dict(url_args)
	bc_url_args['path'] = pi['path']
	breadcrumbs.append({'name': pi['name'],
	'url': reverse(browse_view_name,
	kwargs=bc_url_args,
	query_params=query_params)})

	breadcrumbs.append({'name': filename,
	'url': None})

	browse_content_link = \
	gen_content_link(sha1_git, link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})

	content_raw_url = reverse('browse-content-raw',
	kwargs={'query_string': query_string},
	query_params={'filename': filename})

	browse_rev_link = \
	gen_revision_link(revision_id,
	snapshot_context=snapshot_context,
	link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})

	content_metadata = {
	'context-independent content': browse_content_link,
	'sha1 checksum': content_data['checksums']['sha1'],
	'sha1_git checksum': content_data['checksums']['sha1_git'],
	'sha256 checksum': content_data['checksums']['sha256'],
	'blake2s256 checksum': content_data['checksums']['blake2s256'],
	'mime type': content_data['mimetype'],
	'encoding': content_data['encoding'],
	'size': filesizeformat(content_data['length']),
	'language': content_data['language'],
	'licenses': content_data['licenses'],
	'path': '/' + path[:-len(filename)],
	'filename': filename,
	'revision id': revision_id,
	'revision': browse_rev_link,
	'snapshot id': snapshot_id
	}

	if origin_info:
	content_metadata['origin id'] = origin_info['id']
	content_metadata['origin type'] = origin_info['type']
	content_metadata['origin url'] = origin_info['url']
	content_metadata['origin visit date'] = format_utc_iso_date(visit_info['date']) # noqa
	content_metadata['origin visit id'] = visit_info['visit']
	browse_snapshot_url = reverse('browse-snapshot-content',
	kwargs={'snapshot_id': snapshot_id,
	'path': path},
	query_params=request.GET)
	browse_snapshot_link = \
	gen_link(browse_snapshot_url, link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})
	content_metadata['snapshot context'] = browse_snapshot_link

	cnt_sha1_git = content_data['checksums']['sha1_git']
	swh_objects = [{'type': 'content',
	'id': cnt_sha1_git},
	{'type': 'revision',
	'id': revision_id},
	{'type': 'snapshot',
	'id': snapshot_id}]

	release_id = snapshot_context['release_id']
	if release_id:
	swh_objects.append({'type': 'release',
	'id': release_id})

	swh_ids = get_swh_persistent_ids(swh_objects, snapshot_context)

	content_path = '/'.join([bc['name'] for bc in breadcrumbs])
	context_found = 'snapshot: %s' % snapshot_context['snapshot_id']
	if origin_info:
	context_found = 'origin: %s' % origin_info['url']
	heading = 'Content - %s - %s - %s' %\
	(content_path, snapshot_context['branch'], context_found)

	return render(request, 'content.html',
	{'heading': heading,
	'swh_object_name': 'Content',
	'swh_object_metadata': content_metadata,
	'content': content,
	'content_size': content_data['length'],
	'max_content_size': content_display_max_size,
	'mimetype': content_data['mimetype'],
	'language': language,
	'breadcrumbs': breadcrumbs,
	'top_right_link': content_raw_url,
	'top_right_link_text': mark_safe(
	'<i class="fa fa-file-text fa-fw" aria-hidden="true">'
	'</i>Raw File'),
	'snapshot_context': snapshot_context,
	'vault_cooking': None,
	'show_actions_menu': True,
	'swh_ids': swh_ids})


	PER_PAGE = 20


	def browse_snapshot_log(request, snapshot_id=None, origin_type=None,
	origin_url=None, timestamp=None):
	"""
	Django view implementation for browsing a revision history in a
	snapshot context.
	"""
	try:

	snapshot_context = _process_snapshot_request(request, snapshot_id,
	origin_type, origin_url,
	timestamp, browse_context='log') # noqa

	revision_id = snapshot_context['revision_id']
	current_rev = revision_id
	per_page = int(request.GET.get('per_page', PER_PAGE))
	revs_breadcrumb = request.GET.get('revs_breadcrumb', None)

	if revs_breadcrumb:
	current_rev = revs_breadcrumb.split('/')[-1]
	revision_log = service.lookup_revision_log(current_rev,
	limit=per_page+1)
	revision_log = list(revision_log)

	except Exception as exc:
	return handle_view_exception(request, exc)

	swh_type = snapshot_context['swh_type']
	origin_info = snapshot_context['origin_info']
	visit_info = snapshot_context['visit_info']
	url_args = snapshot_context['url_args']
	query_params = snapshot_context['query_params']
	snapshot_id = snapshot_context['snapshot_id']

	query_params['per_page'] = per_page

	revision_log_display_data = prepare_revision_log_for_display(
	revision_log, per_page, revs_breadcrumb, snapshot_context)

	browse_view_name = 'browse-' + swh_type + '-log'

	prev_rev = revision_log_display_data['prev_rev']
	prev_revs_breadcrumb = revision_log_display_data['prev_revs_breadcrumb']
	prev_log_url = None
	query_params['revs_breadcrumb'] = prev_revs_breadcrumb
	if prev_rev:
	prev_log_url = \
	reverse(browse_view_name,
	kwargs=url_args,
	query_params=query_params)

	next_rev = revision_log_display_data['next_rev']
	next_revs_breadcrumb = revision_log_display_data['next_revs_breadcrumb']
	next_log_url = None
	query_params['revs_breadcrumb'] = next_revs_breadcrumb
	if next_rev:
	next_log_url = \
	reverse(browse_view_name,
	kwargs=url_args,
	query_params=query_params)

	revision_log_data = revision_log_display_data['revision_log_data']

	for i, log in enumerate(revision_log_data):
	params = {
	'revision': revision_log[i]['id'],
	}
	if 'visit_id' in query_params:
	params['visit_id'] = query_params['visit_id']
	log['directory'] = gen_snapshot_directory_link(
	snapshot_context, revision_log[i]['id'],
	link_text='<i class="fa fa-folder-open fa-fw" aria-hidden="true">'
	'</i>Browse files',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})

	browse_log_link = \
	gen_revision_log_link(revision_id, link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})

	revision_metadata = {
	'context-independent revision history': browse_log_link,
	'snapshot id': snapshot_id
	}

	if origin_info:
	revision_metadata['origin id'] = origin_info['id']
	revision_metadata['origin type'] = origin_info['type']
	revision_metadata['origin url'] = origin_info['url']
	revision_metadata['origin visit date'] = format_utc_iso_date(visit_info['date']) # noqa
	revision_metadata['origin visit id'] = visit_info['visit']
	browse_snapshot_url = reverse('browse-snapshot-log',
	kwargs={'snapshot_id': snapshot_id},
	query_params=request.GET)
	browse_snapshot_link = \
	gen_link(browse_snapshot_url, link_text='Browse',
	link_attrs={'class': 'btn btn-default btn-sm',
	'role': 'button'})
	revision_metadata['snapshot context'] = browse_snapshot_link

	swh_objects = [{'type': 'revision',
	'id': revision_id},
	{'type': 'snapshot',
	'id': snapshot_id}]

	release_id = snapshot_context['release_id']
	if release_id:
	swh_objects.append({'type': 'release',
	'id': release_id})

	swh_ids = get_swh_persistent_ids(swh_objects, snapshot_context)

	context_found = 'snapshot: %s' % snapshot_context['snapshot_id']
	if origin_info:
	context_found = 'origin: %s' % origin_info['url']
	heading = 'Revision history - %s - %s' %\
	(snapshot_context['branch'], context_found)

	return render(request, 'revision-log.html',
	{'heading': heading,
	'swh_object_name': 'Revision history',
	'swh_object_metadata': revision_metadata,
	'revision_log': revision_log_data,
	'next_log_url': next_log_url,
	'prev_log_url': prev_log_url,
	'breadcrumbs': None,
	'top_right_link': None,
	'top_right_link_text': None,
	'snapshot_context': snapshot_context,
	'vault_cooking': None,
	'show_actions_menu': True,
	'swh_ids': swh_ids})


	def browse_snapshot_branches(request, snapshot_id=None, origin_type=None,
	origin_url=None, timestamp=None):
	"""
	Django view implementation for browsing a list of branches in a snapshot
	context.
	"""
	try:
	snapshot_context = _process_snapshot_request(request, snapshot_id,
	origin_type, origin_url,
	timestamp)

	except Exception as exc:
	return handle_view_exception(request, exc)

	branches_offset = int(request.GET.get('branches_offset', 0))

	swh_type = snapshot_context['swh_type']
	origin_info = snapshot_context['origin_info']
	url_args = snapshot_context['url_args']
	query_params = snapshot_context['query_params']

	browse_view_name = 'browse-' + swh_type + '-directory'

	branches = snapshot_context['branches']

	displayed_branches = \
	branches[branches_offset:branches_offset+PER_PAGE]

	for branch in displayed_branches:
	if snapshot_id:
	revision_url = reverse('browse-revision',
	kwargs={'sha1_git': branch['revision']},
	query_params={'snapshot_id': snapshot_id})
	else:
	revision_url = reverse('browse-revision',
	kwargs={'sha1_git': branch['revision']},
	query_params={'origin_type': origin_info['type'], # noqa
	'origin': origin_info['url']}) # noqa
	query_params['branch'] = branch['name']
	directory_url = reverse(browse_view_name,
	kwargs=url_args,
	query_params=query_params)
	del query_params['branch']
	branch['revision_url'] = revision_url
	branch['directory_url'] = directory_url

	browse_view_name = 'browse-' + swh_type + '-branches'

	prev_branches_url = None
	next_branches_url = None

	next_offset = branches_offset + PER_PAGE
	prev_offset = branches_offset - PER_PAGE
	if next_offset < len(branches):
	query_params['branches_offset'] = next_offset
	next_branches_url = reverse(browse_view_name,
	kwargs=url_args, query_params=query_params)
	query_params['branches_offset'] = None
	if prev_offset >= 0:
	if prev_offset != 0:
	query_params['branches_offset'] = prev_offset
	prev_branches_url = reverse(browse_view_name,
	kwargs=url_args, query_params=query_params)

	heading = 'Branches - '
	if origin_info:
	heading += 'origin: %s' % origin_info['url']
	else:
	heading += 'snapshot: %s' % snapshot_id

	return render(request, 'branches.html',
	{'heading': heading,
	'swh_object_name': 'Branches',
	'swh_object_metadata': {},
	'top_right_link': None,
	'top_right_link_text': None,
	'displayed_branches': displayed_branches,
	'prev_branches_url': prev_branches_url,
	'next_branches_url': next_branches_url,
	'snapshot_context': snapshot_context})


	def browse_snapshot_releases(request, snapshot_id=None, origin_type=None,
	origin_url=None, timestamp=None):
	"""
	Django view implementation for browsing a list of releases in a snapshot
	context.
	"""
	try:
	snapshot_context = _process_snapshot_request(request, snapshot_id,
	origin_type, origin_url,
	timestamp)

	except Exception as exc:
	return handle_view_exception(request, exc)

	releases_offset = int(request.GET.get('releases_offset', 0))

	swh_type = snapshot_context['swh_type']
	origin_info = snapshot_context['origin_info']
	url_args = snapshot_context['url_args']
	query_params = snapshot_context['query_params']

	releases = snapshot_context['releases']

	displayed_releases = \
	releases[releases_offset:releases_offset+PER_PAGE]

	for release in displayed_releases:
	if snapshot_id:
	release_url = reverse('browse-release',
	kwargs={'sha1_git': release['id']},
	query_params={'snapshot_id': snapshot_id})
	else:
	release_url = reverse('browse-release',
	kwargs={'sha1_git': release['id']},
	query_params={'origin_type': origin_info['type'], # noqa
	'origin': origin_info['url']}) # noqa
	query_params['release'] = release['name']
	del query_params['release']
	release['release_url'] = release_url

	browse_view_name = 'browse-' + swh_type + '-releases'

	prev_releases_url = None
	next_releases_url = None

	next_offset = releases_offset + PER_PAGE
	prev_offset = releases_offset - PER_PAGE
	if next_offset < len(releases):
	query_params['releases_offset'] = next_offset
	next_releases_url = reverse(browse_view_name,
	kwargs=url_args, query_params=query_params)
	query_params['releases_offset'] = None
	if prev_offset >= 0:
	if prev_offset != 0:
	query_params['releases_offset'] = prev_offset
	prev_releases_url = reverse(browse_view_name,
	kwargs=url_args, query_params=query_params)

	heading = 'Releases - '
	if origin_info:
	heading += 'origin: %s' % origin_info['url']
	else:
	heading += 'snapshot: %s' % snapshot_id

	return render(request, 'releases.html',
	{'heading': heading,
	'top_panel_visible': False,
	'top_panel_collapsible': False,
	'swh_object_name': 'Releases',
	'swh_object_metadata': {},
	'top_right_link': None,
	'top_right_link_text': None,
	'displayed_releases': displayed_releases,
	'prev_releases_url': prev_releases_url,
	'next_releases_url': next_releases_url,
	'snapshot_context': snapshot_context,
	'vault_cooking': None,
	'show_actions_menu': False})

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