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utils/source-discoverer: Allow ICS with LF line breaks

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RFC 5545 states that CRLF line breaks should be used but other consumer
seems to allow CR being missing.

https://datatracker.ietf.org/doc/html/rfc5545#section-3.1

Note, that the check result was ignored if the content-type is
text/calendar.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/814>
This commit is contained in:
tytan652
2026-08-28 21:51:52 +00:00
committed by Marge Bot
parent 7693feb248
commit d1a400c856
1 changed files with 8 additions and 5 deletions
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src/utils/gcal-source-discoverer.c
+8 -5
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@@ -27,7 +27,7 @@
#include "gcal-source-discoverer.h"
#include "gcal-utils.h"
#define ICAL_HEADER_STRING "BEGIN:VCALENDAR\r\n"
#define ICAL_HEADER_STRING "BEGIN:VCALENDAR"
G_DEFINE_QUARK (GcalSourceDiscoverer, gcal_source_discoverer_error);
@@ -262,6 +262,7 @@ discover_file_in_thread (DiscovererData *data,
g_autoptr (GPtrArray) source = NULL;
g_autoptr (GUri) guri = NULL;
g_autofree gchar *header_string = NULL;
gsize header_string_len;
gsize header_string_read_len;
gboolean is_calendar_header;
const gchar *content_type;
@@ -292,16 +293,18 @@ discover_file_in_thread (DiscovererData *data,
if (!input_stream)
GCAL_RETURN (NULL);
header_string = g_malloc0 (sizeof (gchar) * (strlen (ICAL_HEADER_STRING) + 1));
/* 2 to cover CRLF or LF, only the former is RFC compliant */
header_string_len = strlen (ICAL_HEADER_STRING) + 2;
header_string = g_malloc0 (sizeof (gchar) * (header_string_len + 1));
g_input_stream_read_all (input_stream,
header_string,
strlen (ICAL_HEADER_STRING),
header_string_len,
&header_string_read_len,
cancellable,
NULL);
is_calendar_header = header_string_read_len == strlen (ICAL_HEADER_STRING) &&
g_strcmp0 (ICAL_HEADER_STRING, header_string) == 0;
is_calendar_header = header_string_read_len == header_string_len &&
g_regex_match_simple ("^" ICAL_HEADER_STRING "\\r?\\n", header_string, G_REGEX_DEFAULT, G_REGEX_MATCH_DEFAULT);
g_input_stream_close (input_stream, cancellable, error);