#!/bin/sh

# Checks the ceilings a config can put on a page, that is the caps on refs
# listed, on the lines and the files a diff renders inline, and on the size
# of a blob any view will inflate, along with the clamp on how long an index
# query may be. Crossing one of these has to trim the page or point the
# reader at somewhere better suited, never drop the request, so each case
# watches what survives as closely as what is left out. The last case is the
# same idea applied to a filter, which degrades to escaped text rather than
# failing when its highlighting library is absent.

test_description='Check the ref listing and diff size limits'
. ./setup.sh

if test "$CGIT_HAS_LUA" -eq 1
then
	test_set_prereq LUA
fi

# The limits only show themselves against content that crosses them, so the
# fixture carries more branches and tags than max-ref-count allows and a
# commit whose oversized file diff sits beside a small one, which is what
# tells a per file limit apart from a whole page one.
test_expect_success 'set up limit fixtures' '
	mkrepo repos/limits 1 &&
	(
		cd repos/limits &&
		test_seq 1 60 >big.c &&
		printf "int x;\n" >small.c &&
		git add -A &&
		git commit -m sources &&
		test_seq 301 360 >big.c &&
		printf "int y;\n" >small.c &&
		git commit -am change &&
		for i in 1 2 3; do git branch branch-$i || exit 1; done &&
		for i in 1 2 3; do git tag tag-$i || exit 1; done
	) &&
	{
		echo "virtual-root=/" &&
		echo "cache-size=0" &&
		echo "max-ref-count=2" &&
		echo "max-diff-lines=20" &&
		echo "max-diff-files=0" &&
		echo "repo.url=limits" &&
		echo "repo.path=$PWD/repos/limits/.git"
	} >limitrc &&
	{
		echo "virtual-root=/" &&
		echo "cache-size=0" &&
		echo "max-diff-files=1" &&
		echo "repo.url=limits" &&
		echo "repo.path=$PWD/repos/limits/.git"
	} >limitfilesrc
'

limitq() { CGIT_CONFIG="$PWD/limitrc" QUERY_STRING="$1" cgit; }

# An index query is compared against every repository the listing holds, so
# an enormous one multiplies out across the whole index. Clamping it rather
# than refusing it keeps the cost bounded without making an ordinary search
# behave any differently.
test_expect_success 'an enormous query is clamped, not rejected' '
	long=$(awk "BEGIN{s=\"\";for(i=0;i<4000;i++)s=s \"a\"; print s}") &&
	test ${#long} -eq 4000 &&
	cgit_query "q=$long" >tmp &&
	grep "</html>" tmp &&
	longest=$(grep -o "aaaa*" tmp | awk "{print length}" | sort -n | tail -1) &&
	test "$longest" -eq 512
'

test_expect_success 'an ordinary query still filters the index' '
	cgit_query "q=foo" >tmp &&
	grep "foo" tmp &&
	! grep ">bar<" tmp
'

# The combined refs page caps branches and tags separately, and the pages it
# hands the overflow to page on their own, so a limit that leaked between the
# two sections would show up as the wrong link or the wrong count here.
test_expect_success 'refs page lists max-ref-count branches and tags' '
	limitq "url=limits/refs/" >tmp &&
	test $(grep -c "log/?h=" tmp) -eq 2 &&
	test $(grep -c "/tag/?h=tag-" tmp) -eq 2
'

test_expect_success 'refs page links each overflow to its own category' '
	grep "refs/heads" tmp &&
	grep "refs/tags" tmp
'

test_expect_success 'branch page paginates independently' '
	limitq "url=limits/refs/heads/" >tmp &&
	test $(grep -c "log/?h=" tmp) -eq 2 &&
	grep "\[next\]" tmp &&
	limitq "url=limits/refs/heads/&ofs=2" >tmp &&
	grep "\[prev\]" tmp &&
	! grep "/tag/?h=tag-" tmp
'

test_expect_success 'tag page paginates independently' '
	limitq "url=limits/refs/tags/&ofs=2" >tmp &&
	grep "/tag/?h=tag-" tmp &&
	grep "\[prev\]" tmp &&
	! grep "log/?h=" tmp
'

# A file that busts max-diff-lines is replaced by a link to its own page,
# where the reader asked for that one file and the limit no longer applies.
# The rest of the commit still renders, so one huge file cannot hide the
# small change beside it.
test_expect_success 'oversized file diff is replaced by a link' '
	limitq "url=limits/commit/" >tmp &&
	grep "too large to be rendered inline" tmp &&
	grep "View it on its own page" tmp
'

test_expect_success 'small file in the same commit still renders inline' '
	grep "class=.add.>+int y;" tmp
'

test_expect_success 'the single-file diff page always renders in full' '
	limitq "url=limits/diff/big.c" >tmp &&
	grep "class=.hunk." tmp &&
	! grep "too large to be rendered inline" tmp
'

# max-diff-files counts the files in a commit rather than the lines in one,
# so it drops the whole body back to the diffstat while a request naming a
# single file stays unaffected.
test_expect_success 'a commit changing too many files shows stat only' '
	CGIT_CONFIG="$PWD/limitfilesrc" QUERY_STRING="url=limits/commit/" cgit >tmp &&
	grep "too large to be rendered inline" tmp &&
	! grep "class=.hunk." tmp
'

test_expect_success 'the single-file page is not limited by max-diff-files' '
	CGIT_CONFIG="$PWD/limitfilesrc" QUERY_STRING="url=limits/diff/small.c" cgit >tmp &&
	grep "class=.hunk." tmp
'

# The diff views must not inflate a blob past max-blob-size merely to render
# it, which is the same defence the tree and plain views make and is easy to
# miss on this path. Such a file is reported as binary instead.
test_expect_success 'a diff of an oversized blob is not inlined' '
	mkrepo repos/blobdiff 1 &&
	(
		cd repos/blobdiff &&
		awk "BEGIN{for(i=0;i<400;i++)print \"aaaaaaaa\"}" >big.txt &&
		git add -A &&
		git commit -m add &&
		awk "BEGIN{for(i=0;i<401;i++)print \"aaaaaaaa\"}" >big.txt &&
		git commit -am change
	) &&
	{
		echo "virtual-root=/" &&
		echo "cache-size=0" &&
		echo "max-blob-size=1" &&
		echo "repo.url=blobdiff" &&
		echo "repo.path=$PWD/repos/blobdiff/.git"
	} >blobdiffrc &&
	sha=$(git -C repos/blobdiff rev-parse HEAD) &&
	CGIT_CONFIG="$PWD/blobdiffrc" QUERY_STRING="url=blobdiff/commit/&id=$sha" cgit >tmp &&
	grep "Binary files differ" tmp &&
	! grep "aaaaaaaa" tmp
'

# A missing scintillua leaves the shipped filter with nothing to highlight
# with, and a filter that failed there would take the whole page down with
# it, so it has to hand the source back escaped instead.
test_expect_success LUA 'highlight filter passes text through without scintillua' '
	{
		echo "virtual-root=/" &&
		echo "cache-size=0" &&
		echo "source-filter=lua:$(cd ../../custom/extensions && pwd)/syntax-highlight.lua" &&
		echo "repo.url=limits" &&
		echo "repo.path=$PWD/repos/limits/.git"
	} >hlrc &&
	CGIT_SCINTILLUA_PATH=/nonexistent CGIT_CONFIG="$PWD/hlrc" \
		QUERY_STRING="url=limits/tree/small.c" cgit >tmp &&
	grep "int y;" tmp
'

test_done