Support cors-allow-origin with multiple origins (#7614)

* Add Initial support for multiple cors origins in nginx

- bump cluster version for `make dev-env`
- add buildOriginRegex function in nginx.tmpl
- add e2e 4 e2e tests for cors.go
- refers to feature request #5496

* add tests + use search to identify '*' origin

* add tests + use search to identify '*' origin

Signed-off-by: Christopher Larivière <lariviere.c@gmail.com>

* fix "should enable cors test" looking at improper values

* Modify tests and add some logic for origin validation

- add origin validation in cors ingress annotations
- add extra tests to validate regex
- properly escape regex using "QuoteMeta"
- fix some copy/paste errors

* add TrimSpace and length validation before adding a new origin

* modify documentation for cors and remove dangling comment

* add support for optional port mapping on origin

* support single-level wildcard subdomains + tests

* Remove automatic `*` fonctionality from incorrect origins

- use []string instead of basic string to avoid reparsing in template.go
- fix typo in docs
- modify template to properly enable only if the whole block is enabled
- modify cors parsing
- test properly by validating that the value returned is the proper
  origin
- update unit tests and annotation tests

* Re-add `*` when no cors origins are supplied + fix tests

- fix e2e tests to allow for `*`
- re-add `*` to cors parsing if trimmed cors-allow-origin is empty
(supplied but empty) and if it wasn't supplied at all.

* remove unecessary logic for building cors origin + remove comments

- add some edge cases in e2e tests
- rework logic for building cors origin

there was no need for logic in template.go for buildCorsOriginRegex
if there is a `*` it ill be short-circuited by first if.

if it's a wildcard domain or any domain (without a wildcard), it MUST
match the main/cors.go regex format.

if there's a star in a wildcard domain, it must be replaced with
`[A-Za-z0-9]+`

* add missing check in e2e tests

internal/ingress/controller/template/template.go

@@ -276,6 +276,7 @@ var (
 		"shouldLoadAuthDigestModule":         shouldLoadAuthDigestModule,
 		"shouldLoadInfluxDBModule":           shouldLoadInfluxDBModule,
 		"buildServerName":                    buildServerName,
+		"buildCorsOriginRegex":               buildCorsOriginRegex,
 	}
 )
 
@@ -1676,3 +1677,29 @@ func convertGoSliceIntoLuaTable(goSliceInterface interface{}, emptyStringAsNil b
 		return "", fmt.Errorf("could not process type: %s", kind)
 	}
 }
+
+func buildOriginRegex(origin string) string {
+	origin = regexp.QuoteMeta(origin)
+	origin = strings.Replace(origin, "\\*", "[A-Za-z0-9]+", 1)
+	return fmt.Sprintf("(%s)", origin)
+}
+
+func buildCorsOriginRegex(corsOrigins []string) string {
+	if len(corsOrigins) == 1 && corsOrigins[0] == "*" {
+		return "set $http_origin *;\nset $cors 'true';"
+	}
+
+	var originsRegex string = "if ($http_origin ~* ("
+	for i, origin := range corsOrigins {
+		originTrimmed := strings.TrimSpace(origin)
+		if len(originTrimmed) > 0 {
+			builtOrigin := buildOriginRegex(originTrimmed)
+			originsRegex += builtOrigin
+			if i != len(corsOrigins)-1 {
+				originsRegex = originsRegex + "|"
+			}
+		}
+	}
+	originsRegex = originsRegex + ")$ ) { set $cors 'true'; }"
+	return originsRegex
+}