pulse-server: move quirks to a json blob

Make the quirks table as a json blob so that we can move it
out when we need to.

src/modules/module-protocol-pulse/quirks.c

@@ -22,21 +22,109 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#include "quirks.h"
+#include <regex.h>
+
+#include <spa/utils/json.h>
 
 #include <pipewire/properties.h>
 
-int client_update_quirks(struct client *client)
-{
-	const char *str;
+#include "quirks.h"
 
-	if ((str = pw_properties_get(client->props, "application.process.binary")) != NULL &&
-	    spa_streq(str, "teams")) {
-		client->quirks |= QUIRK_FORCE_S16_FORMAT;
-	}
-	if ((str = pw_properties_get(client->props, "application.process.binary")) != NULL &&
-	    spa_streq(str, "firefox")) {
-		client->quirks |= QUIRK_REMOVE_CAPTURE_DONT_MOVE;
+#define QUOTE(...) #__VA_ARGS__
+
+static const char quirks_rules[] =
+"# List of quirks"
+"#"
+"# All key/value pairs need to match before the quirks are applied."
+"#"
+"# Possible quirks:"
+"#    force-s16-info		forces sink and source info as S16 format"
+"#    remove-capture-dont-move	removes the capture DONT_MOVE flag"
+"#\n"
+"["
+"    { application.process.binary = teams, quirks = [ force-s16-info ] },"
+"    { application.process.binary = firefox, quirks = [ remove-capture-dont-move ] },"
+"]";
+
+static uint64_t parse_quirks(const char *str)
+{
+	static const struct { const char *key; uint64_t value; } quirk_keys[] = {
+		{ "force-s16-info", QUIRK_FORCE_S16_FORMAT },
+		{ "remove-capture-dont-move", QUIRK_REMOVE_CAPTURE_DONT_MOVE },
+	};
+	size_t i;
+	for (i = 0; i < SPA_N_ELEMENTS(quirk_keys); ++i) {
+		if (spa_streq(str, quirk_keys[i].key))
+			return quirk_keys[i].value;
 	}
 	return 0;
 }
+
+static int match(const char *rules, struct spa_dict *dict, uint64_t *quirks)
+{
+	struct spa_json rules_json = SPA_JSON_INIT(rules, strlen(rules));
+	struct spa_json rules_arr, it[2];
+
+	if (spa_json_enter_array(&rules_json, &rules_arr) <= 0)
+		return -EINVAL;
+
+	while (spa_json_enter_object(&rules_arr, &it[0]) > 0) {
+		char key[256];
+		int match = true;
+		uint64_t quirks_cur = 0;
+
+		while (spa_json_get_string(&it[0], key, sizeof(key)-1) > 0) {
+			char val[4096];
+			const char *str, *value;
+			int len;
+			bool success = false;
+
+			if (spa_streq(key, "quirks")) {
+				if (spa_json_enter_array(&it[0], &it[1]) > 0) {
+					while (spa_json_get_string(&it[1], val, sizeof(val)-1) > 0)
+						quirks_cur |= parse_quirks(val);
+				}
+				continue;
+			}
+			if ((len = spa_json_next(&it[0], &value)) <= 0)
+				break;
+
+			if (spa_json_is_null(value, len)) {
+				value = NULL;
+			} else {
+				spa_json_parse_string(value, SPA_MIN(len, (int)sizeof(val)-1), val);
+				value = val;
+			}
+			str = spa_dict_lookup(dict, key);
+			if (value == NULL) {
+				success = str == NULL;
+			} else if (str != NULL) {
+				if (value[0] == '~') {
+					regex_t r;
+					if (regcomp(&r, value+1, REG_EXTENDED | REG_NOSUB) == 0) {
+						if (regexec(&r, str, 0, NULL, 0) == 0)
+							success = true;
+						regfree(&r);
+					}
+				} else if (spa_streq(str, value)) {
+					success = true;
+				}
+			}
+
+			if (!success) {
+				match = false;
+				break;
+			}
+                }
+		if (match) {
+			*quirks = quirks_cur;
+			return 1;
+		}
+	}
+	return 0;
+}
+
+int client_update_quirks(struct client *client)
+{
+	return match(quirks_rules, &client->props->dict, &client->quirks);
+}