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	# Copyright (C) 2017-2018 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

	import difflib
	import json

	from distutils.util import strtobool

	from django.http import HttpResponse
	from django.utils.safestring import mark_safe
	from django.shortcuts import render
	from django.template.defaultfilters import filesizeformat

	from swh.model.hashutil import hash_to_hex

	from swh.web.common import query
	from swh.web.common.utils import (
	reverse, gen_path_info
	)
	from swh.web.common.exc import NotFoundExc, handle_view_exception
	from swh.web.browse.utils import (
	request_content, prepare_content_for_display,
	content_display_max_size, get_snapshot_context,
	get_swh_persistent_ids
	)
	from swh.web.browse.browseurls import browse_route


	@browse_route(r'content/(?P<query_string>.+)/raw/',
	view_name='browse-content-raw')
	def content_raw(request, query_string):
	"""Django view that produces a raw display of a SWH content identified
	by its hash value.

	The url that points to it is :http:get:`/browse/content/[(algo_hash):](hash)/raw/`
	""" # noqa

	try:
	algo, checksum = query.parse_hash(query_string)
	checksum = hash_to_hex(checksum)
	content_data = request_content(query_string, max_size=None)
	except Exception as exc:
	return handle_view_exception(request, exc)

	filename = request.GET.get('filename', None)
	if not filename:
	filename = '%s_%s' % (algo, checksum)

	if content_data['mimetype'].startswith('text/') or \
	content_data['mimetype'] == 'inode/x-empty':
	response = HttpResponse(content_data['raw_data'],
	content_type="text/plain")
	response['Content-disposition'] = 'filename=%s' % filename
	else:
	response = HttpResponse(content_data['raw_data'],
	content_type='application/octet-stream')
	response['Content-disposition'] = 'attachment; filename=%s' % filename
	return response


	_auto_diff_size_limit = 20000


	@browse_route(r'content/(?P<from_query_string>.)/diff/(?P<to_query_string>.)', # noqa
	view_name='diff-contents')
	def _contents_diff(request, from_query_string, to_query_string):
	"""
	Browse endpoint used to compute unified diffs between two contents.

	Diffs are generated only if the two contents are textual.
	By default, diffs whose size are greater than 20 kB will
	not be generated. To force the generation of large diffs,
	the 'force' boolean query parameter must be used.

	Args:
	request: input django http request
	from_query_string: a string of the form "[ALGO_HASH:]HASH" where
	optional ALGO_HASH can be either sha1, sha1_git, sha256,
	or blake2s256 (default to sha1) and HASH the hexadecimal
	representation of the hash value identifying the first content
	to_query_string: same as above for identifying the second content

	Returns:
	A JSON object containing the unified diff.

	"""
	diff_data = {}
	content_from = None
	content_to = None
	content_from_size = 0
	content_to_size = 0
	content_from_lines = []
	content_to_lines = []
	force = request.GET.get('force', 'false')
	path = request.GET.get('path', None)
	language = 'nohighlight-swh'

	force = bool(strtobool(force))

	if from_query_string == to_query_string:
	diff_str = 'File renamed without changes'
	else:
	try:
	text_diff = True
	if from_query_string:
	content_from = \
	request_content(from_query_string, max_size=None)
	content_from_display_data = \
	prepare_content_for_display(content_from['raw_data'],
	content_from['mimetype'], path)
	language = content_from_display_data['language']
	content_from_size = content_from['length']
	if not (content_from['mimetype'].startswith('text/') or
	content_from['mimetype'] == 'inode/x-empty'):
	text_diff = False

	if text_diff and to_query_string:
	content_to = request_content(to_query_string, max_size=None)
	content_to_display_data = prepare_content_for_display(
	content_to['raw_data'], content_to['mimetype'], path)
	language = content_to_display_data['language']
	content_to_size = content_to['length']
	if not (content_to['mimetype'].startswith('text/') or
	content_to['mimetype'] == 'inode/x-empty'):
	text_diff = False

	diff_size = abs(content_to_size - content_from_size)

	if not text_diff:
	diff_str = 'Diffs are not generated for non textual content'
	language = 'nohighlight-swh'
	elif not force and diff_size > _auto_diff_size_limit:
	diff_str = 'Large diffs are not automatically computed'
	language = 'nohighlight-swh'
	else:
	if content_from:
	content_from_lines = \
	content_from['raw_data'].decode('utf-8')\
	.splitlines(True)
	if content_from_lines and \
	content_from_lines[-1][-1] != '\n':
	content_from_lines[-1] += '[swh-no-nl-marker]\n'

	if content_to:
	content_to_lines = content_to['raw_data'].decode('utf-8')\
	.splitlines(True)
	if content_to_lines and content_to_lines[-1][-1] != '\n':
	content_to_lines[-1] += '[swh-no-nl-marker]\n'

	diff_lines = difflib.unified_diff(content_from_lines,
	content_to_lines)
	diff_str = ''.join(list(diff_lines)[2:])
	except Exception as e:
	diff_str = str(e)

	diff_data['diff_str'] = diff_str
	diff_data['language'] = language
	diff_data_json = json.dumps(diff_data, separators=(',', ': '))
	return HttpResponse(diff_data_json, content_type='application/json')


	@browse_route(r'content/(?P<query_string>.+)/',
	view_name='browse-content')
	def content_display(request, query_string):
	"""Django view that produces an HTML display of a SWH content identified
	by its hash value.

	The url that points to it is :http:get:`/browse/content/[(algo_hash):](hash)/`
	""" # noqa
	try:
	algo, checksum = query.parse_hash(query_string)
	checksum = hash_to_hex(checksum)
	content_data = request_content(query_string)
	origin_type = request.GET.get('origin_type', None)
	origin_url = request.GET.get('origin_url', None)
	if not origin_url:
	origin_url = request.GET.get('origin', None)
	snapshot_context = None
	if origin_url:
	try:
	snapshot_context = get_snapshot_context(None, origin_type,
	origin_url)
	except Exception:
	raise NotFoundExc('The Software Heritage archive has a content'
	' with the hash you provided but the origin '
	'mentioned in your request appears broken: '
	'%s. Please check the URL and try again.' %
	origin_url)
	if snapshot_context:
	snapshot_context['visit_info'] = None
	except Exception as exc:
	return handle_view_exception(request, exc)

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

	content = None
	language = None
	mimetype = 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']
	mimetype = content_display_data['mimetype']

	root_dir = None
	filename = None
	path_info = None

	breadcrumbs = []

	if path:
	split_path = path.split('/')
	root_dir = split_path[0]
	filename = split_path[-1]
	path = path.replace(root_dir + '/', '')
	path = path[:-len(filename)]
	path_info = gen_path_info(path)
	breadcrumbs.append({'name': root_dir[:7],
	'url': reverse('browse-directory',
	kwargs={'sha1_git': root_dir})})
	for pi in path_info:
	breadcrumbs.append({'name': pi['name'],
	'url': reverse('browse-directory',
	kwargs={'sha1_git': root_dir,
	'path': pi['path']})})
	breadcrumbs.append({'name': filename,
	'url': None})

	query_params = None
	if filename:
	query_params = {'filename': filename}

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

	content_metadata = {
	'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']
	}

	if filename:
	content_metadata['filename'] = filename

	sha1_git = content_data['checksums']['sha1_git']
	swh_ids = get_swh_persistent_ids([{'type': 'content',
	'id': sha1_git}])

	heading = 'Content - %s' % sha1_git
	if breadcrumbs:
	content_path = '/'.join([bc['name'] for bc in breadcrumbs])
	heading += ' - %s' % content_path

	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': 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})

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