Rework project structure

internal/shared/paste.go

@@ -0,0 +1,30 @@
+package shared
+
+import (
+	"github.com/alexedwards/argon2id"
+)
+
+// Paste represents a saved paste
+type Paste struct {
+	ID            string `json:"id" bson:"_id"`
+	Content       string `json:"content" bson:"content"`
+	DeletionToken string `json:"deletionToken,omitempty" bson:"deletionToken"`
+	Created       int64  `json:"created" bson:"created"`
+	AutoDelete    bool   `json:"autoDelete" bson:"autoDelete"`
+}
+
+// HashDeletionToken hashes the current deletion token of a paste
+func (paste *Paste) HashDeletionToken() error {
+	hash, err := argon2id.CreateHash(paste.DeletionToken, argon2id.DefaultParams)
+	if err != nil {
+		return err
+	}
+	paste.DeletionToken = hash
+	return nil
+}
+
+// CheckDeletionToken checks whether or not the given deletion token is correct
+func (paste *Paste) CheckDeletionToken(deletionToken string) bool {
+	match, err := argon2id.ComparePasswordAndHash(deletionToken, paste.DeletionToken)
+	return err == nil && match
+}