Fixes for filtering and addition of 'from' filter

datatrails-common-api/assets/v2/assets/listevents.proto

@@ -142,6 +142,13 @@ message ListEventsRequest {
 
     // filter events by mmr index
     optional int64 mmr_index = 24 [(validate.rules).int64.gte = 0];
+
+    // filter from wallet address
+    optional string from = 25 [
+        (validate.rules).string = {
+            pattern: "^0x[[:xdigit:]]+$"
+        }
+    ];
 }
 
 message ListEventsResponse {

datatrails-common-api/marshalers/query/attributeparser.go

@@ -264,15 +264,15 @@ func getFilterParts(spec string) ([]string, error) {
 	filters := []string{}
 
 	// greedy match for stuff surrounded by single quotes
-	matchQuote := `'((?:[^']|.)*)'`
+	matchQuote := `'((?:[^'\\]|\\.)*)'`
 	q, err := regexp.Compile(matchQuote)
 	if err != nil {
 		return filters, err
 	}
 
 	// match fiter-ish thing - some attribute equals to a value in quotes with spaces
-	// or continues string
-	matchTerm := `(\S+?)=(('.+')|(\S+?))(\s|$)`
+	// or continous string
+	matchTerm := `(\S+?)=(('((?:[^'\\]|\\.)*)')|(\S+?))(\s|$)`
 	r, err := regexp.Compile(matchTerm)
 	if err != nil {
 		return filters, err
@@ -285,16 +285,17 @@ func getFilterParts(spec string) ([]string, error) {
 			term := r.FindStringSubmatch(filterSpec)
 			// trim excessive unquoted spaces and trim the part we're processing
 			filterSpec = strings.TrimSpace(strings.TrimPrefix(filterSpec, term[0]))
-			// trim outer quotes if they are present
+			// trim outer quotes if they are present and replace the escape sequences
 			t := q.ReplaceAllString(term[2], "$1")
+			t = strings.ReplaceAll(t, "\\'", "'")
 			// append our new term to filters list
 			filters = append(filters, fmt.Sprintf("%s=%s", strings.TrimSpace(term[1]), t))
 			// check if we have anything left
 			if len(filterSpec) > 0 {
 				// if we have an or we remove it, otherwise we fail
 				// as we have some additonal unexpected text
 				if !strings.HasPrefix(strings.ToLower(filterSpec), "or ") {
-					return filters, fmt.Errorf("malformd filter")
+					return filters, fmt.Errorf("malformed filter")
 				}
 				filterSpec = filterSpec[3:]
 			}

datatrails-common-api/marshalers/query/attributeparser_test.go

@@ -32,9 +32,9 @@ func TestFilterParsing(t *testing.T) {
 		{
 			name:           "test multiple or",
 			message:        &assets.ListAssetsRequest{},
-			values:         map[string][]string{"filters": {"attributes.foo=2 OR attributes.bar=2", "attributes.foo=dd OR attributes.bar=77"}},
+			values:         map[string][]string{"filters": {"attributes.foo='2' OR attributes.bar=2", "attributes.foo='dd xx' OR attributes.bar='77'"}},
 			parser:         &runtime.DefaultQueryParser{},
-			expectedResult: [][]string{{"attributes.foo=2", "attributes.bar=2"}, {"attributes.foo=dd", "attributes.bar=77"}},
+			expectedResult: [][]string{{"attributes.foo=2", "attributes.bar=2"}, {"attributes.foo=dd xx", "attributes.bar=77"}},
 		},
 		{
 			name:           "test or *",
@@ -118,12 +118,12 @@ func TestGetFilterParts(t *testing.T) {
 		},
 		{
 			name:           "test different cases",
-			filterSpec:     "attributes.foo=2 OR attributes.bar=' stuff or 245677 some 'other' stuff' oR foo.bar=single or bar.baz=popmo Or pop=push_1",
+			filterSpec:     `attributes.foo=2 OR attributes.bar=' stuff or 245677 some \'other\' stuff' oR foo.bar=single or bar.baz=popmo Or pop=push_1`,
 			expectedResult: []string{"attributes.foo=2", "attributes.bar= stuff or 245677 some 'other' stuff", "foo.bar=single", "bar.baz=popmo", "pop=push_1"},
 		},
 		{
 			name:           "test quoted",
-			filterSpec:     "attributes.foo=2 or attributes.bar=''something' or = 'else''",
+			filterSpec:     "attributes.foo=2 or attributes.bar='\\'something\\' or = \\'else\\''",
 			expectedResult: []string{"attributes.foo=2", "attributes.bar='something' or = 'else'"},
 		},
 		{