[feature] add rate limit middleware (#741)

* feat: add rate limit middleware

* chore: update vendor dir

* chore: update readme with new dependency

* chore: add rate limit infos to swagger.md file

* refactor: add ipv6 mask limiter option

Add IPv6 CIDR /64 mask

* refactor: increase rate limit to 1000

Address https://github.com/superseriousbusiness/gotosocial/pull/741#discussion_r945584800

Co-authored-by: tobi <31960611+tsmethurst@users.noreply.github.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/vendor/github.com/ulule/limiter/v3/drivers/store/common/context.go b/vendor/github.com/ulule/limiter/v3/drivers/store/common/context.go
new file mode 100644
index 000000000..d181a460b
--- /dev/null
+++ b/vendor/github.com/ulule/limiter/v3/drivers/store/common/context.go
@@ -0,0 +1,28 @@
+package common
+
+import (
+	"time"
+
+	"github.com/ulule/limiter/v3"
+)
+
+// GetContextFromState generate a new limiter.Context from given state.
+func GetContextFromState(now time.Time, rate limiter.Rate, expiration time.Time, count int64) limiter.Context {
+	limit := rate.Limit
+	remaining := int64(0)
+	reached := true
+
+	if count <= limit {
+		remaining = limit - count
+		reached = false
+	}
+
+	reset := expiration.Unix()
+
+	return limiter.Context{
+		Limit:     limit,
+		Remaining: remaining,
+		Reset:     reset,
+		Reached:   reached,
+	}
+}