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lib/index: add simple html filter

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The filter just drops all (HTML) tags. As an enabling change, pass the
content type to the filter constructor so we can decide which scanner
to user.
This commit is contained in:
David Bremner 2017-06-07 23:11:49 -03:00
parent 64f81f95a1
commit 6dd00d6486
2 changed files with 45 additions and 8 deletions
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48
lib/index.cc
View file

@ -58,6 +58,33 @@ static const scanner_state_t uuencode_states[] = {
{12, ' ', '`', 12, 11}
};
/* The following table is intended to implement this DFA (in 'dot'
format). Note that 2 and 3 are "hidden" states used to step through
the possible out edges of state 1.
digraph html_filter {
0 -> 1 [label="<"];
0 -> 0;
1 -> 4 [label="'"];
1 -> 5 [label="\""];
1 -> 0 [label=">"];
1 -> 1;
4 -> 1 [label="'"];
4 -> 4;
5 -> 1 [label="\""];
5 -> 5;
}
*/
static const int first_html_skipping_state = 1;
static const scanner_state_t html_states[] = {
{0, '<', '<', 1, 0},
{1, '\'', '\'', 4, 2}, /* scanning for quote or > */
{1, '"', '"', 5, 3},
{1, '>', '>', 0, 1},
{4, '\'', '\'', 1, 4}, /* inside single quotes */
{5, '"', '"', 1, 5}, /* inside double quotes */
};
/* Oh, how I wish that gobject didn't require so much noisy boilerplate!
* (Though I have at least eliminated some of the stock set...) */
typedef struct _NotmuchFilterDiscardNonTerm NotmuchFilterDiscardNonTerm;
@ -90,6 +117,7 @@ typedef struct _NotmuchFilterDiscardNonTermClass NotmuchFilterDiscardNonTermClas
**/
struct _NotmuchFilterDiscardNonTerm {
GMimeFilter parent_object;
GMimeContentType *content_type;
int state;
int first_skipping_state;
const scanner_state_t *states;
@ -99,7 +127,7 @@ struct _NotmuchFilterDiscardNonTermClass {
GMimeFilterClass parent_class;
};
static GMimeFilter *notmuch_filter_discard_non_term_new (void);
static GMimeFilter *notmuch_filter_discard_non_term_new (GMimeContentType *content);
static void notmuch_filter_discard_non_term_finalize (GObject *object);
@ -138,8 +166,8 @@ notmuch_filter_discard_non_term_finalize (GObject *object)
static GMimeFilter *
filter_copy (GMimeFilter *gmime_filter)
{
(void) gmime_filter;
return notmuch_filter_discard_non_term_new ();
NotmuchFilterDiscardNonTerm *filter = (NotmuchFilterDiscardNonTerm *) gmime_filter;
return notmuch_filter_discard_non_term_new (filter->content_type);
}
static void
@ -211,7 +239,7 @@ filter_reset (GMimeFilter *gmime_filter)
* Returns: a new #NotmuchFilterDiscardNonTerm filter.
**/
static GMimeFilter *
notmuch_filter_discard_non_term_new (void)
notmuch_filter_discard_non_term_new (GMimeContentType *content_type)
{
static GType type = 0;
NotmuchFilterDiscardNonTerm *filter;
@ -234,9 +262,15 @@ notmuch_filter_discard_non_term_new (void)
}
filter = (NotmuchFilterDiscardNonTerm *) g_object_newv (type, 0, NULL);
filter->content_type = content_type;
filter->state = 0;
filter->states = uuencode_states;
filter->first_skipping_state = first_uuencode_skipping_state;
if (g_mime_content_type_is_type (content_type, "text", "html")) {
filter->states = html_states;
filter->first_skipping_state = first_html_skipping_state;
} else {
filter->states = uuencode_states;
filter->first_skipping_state = first_uuencode_skipping_state;
}
return (GMimeFilter *) filter;
}
@ -413,7 +447,7 @@ _index_mime_part (notmuch_message_t *message,
g_mime_stream_mem_set_owner (GMIME_STREAM_MEM (stream), FALSE);
filter = g_mime_stream_filter_new (stream);
discard_non_term_filter = notmuch_filter_discard_non_term_new ();
discard_non_term_filter = notmuch_filter_discard_non_term_new (content_type);
g_mime_stream_filter_add (GMIME_STREAM_FILTER (filter),
discard_non_term_filter);

5
test/T680-html-indexing.sh
View file

@ -5,10 +5,13 @@ test_description="indexing of html parts"
add_email_corpus html
test_begin_subtest 'embedded images should not be indexed'
test_subtest_known_broken
notmuch search kwpza7svrgjzqwi8fhb2msggwtxtwgqcxp4wbqr4wjddstqmeqa7 > OUTPUT
test_expect_equal_file /dev/null OUTPUT
test_begin_subtest 'ignore > in attribute text'
notmuch search swordfish | notmuch_search_sanitize > OUTPUT
test_expect_equal_file /dev/null OUTPUT
test_begin_subtest 'non tag text should be indexed'
notmuch search hunter2 | notmuch_search_sanitize > OUTPUT
cat <<EOF > EXPECTED