vendor: update

8 files changed, 883 insertions, 0 deletions

diff --git a/vendor/github.com/uudashr/iface/LICENSE b/vendor/github.com/uudashr/iface/LICENSE
new file mode 100644
index 000000000..261eeb9e9
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
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+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
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+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
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+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
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+
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+          notices within Derivative Works that You distribute, alongside
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+
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+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
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+      on Your own behalf and on Your sole responsibility, not on behalf
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+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/vendor/github.com/uudashr/iface/identical/doc.go b/vendor/github.com/uudashr/iface/identical/doc.go
new file mode 100644
index 000000000..5b848a913
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/identical/doc.go
@@ -0,0 +1,3 @@
+// Package identical defines an Analyzer that identifies interfaces in the same
+// package with identical methods or constraints.
+package identical
diff --git a/vendor/github.com/uudashr/iface/identical/identical.go b/vendor/github.com/uudashr/iface/identical/identical.go
new file mode 100644
index 000000000..bd573cfc4
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/identical/identical.go
@@ -0,0 +1,138 @@
+package identical
+
+import (
+	"fmt"
+	"go/ast"
+	"go/token"
+	"go/types"
+	"reflect"
+
+	"github.com/uudashr/iface/internal/directive"
+	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/passes/inspect"
+	"golang.org/x/tools/go/ast/inspector"
+)
+
+// Analyzer is the duplicate interface analyzer.
+var Analyzer = newAnalyzer()
+
+func newAnalyzer() *analysis.Analyzer {
+	r := runner{}
+
+	analyzer := &analysis.Analyzer{
+		Name:     "identical",
+		Doc:      "Identifies interfaces in the same package that have identical method sets",
+		URL:      "https://pkg.go.dev/github.com/uudashr/iface/duplicate",
+		Requires: []*analysis.Analyzer{inspect.Analyzer},
+		Run:      r.run,
+	}
+
+	analyzer.Flags.BoolVar(&r.debug, "debug", false, "enable debug mode")
+
+	return analyzer
+}
+
+type runner struct {
+	debug bool
+}
+
+func (r *runner) run(pass *analysis.Pass) (interface{}, error) {
+	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
+
+	// Collect interface type declarations
+	ifaceDecls := make(map[string]token.Pos)
+	ifaceTypes := make(map[string]*types.Interface)
+
+	nodeFilter := []ast.Node{
+		(*ast.GenDecl)(nil),
+	}
+
+	inspect.Preorder(nodeFilter, func(n ast.Node) {
+		decl, ok := n.(*ast.GenDecl)
+		if !ok {
+			return
+		}
+
+		if r.debug {
+			fmt.Printf("GenDecl: %v specs=%d\n", decl.Tok, len(decl.Specs))
+		}
+
+		if decl.Tok != token.TYPE {
+			return
+		}
+
+		for i, spec := range decl.Specs {
+			if r.debug {
+				fmt.Printf(" spec[%d]: %v %v\n", i, spec, reflect.TypeOf(spec))
+			}
+
+			ts, ok := spec.(*ast.TypeSpec)
+			if !ok {
+				return
+			}
+
+			ifaceType, ok := ts.Type.(*ast.InterfaceType)
+			if !ok {
+				return
+			}
+
+			if r.debug {
+				fmt.Println("Interface declaration:", ts.Name.Name, ts.Pos(), len(ifaceType.Methods.List))
+
+				for i, field := range ifaceType.Methods.List {
+					switch ft := field.Type.(type) {
+					case *ast.FuncType:
+						fmt.Printf(" [%d] Field: func %s %v %v\n", i, field.Names[0].Name, reflect.TypeOf(field.Type), field.Pos())
+					case *ast.Ident:
+						fmt.Printf(" [%d] Field: iface %s %v %v\n", i, ft.Name, reflect.TypeOf(field.Type), field.Pos())
+					default:
+						fmt.Printf(" [%d] Field: unknown %v\n", i, reflect.TypeOf(ft))
+					}
+				}
+			}
+
+			dir := directive.ParseIgnore(decl.Doc)
+			if dir != nil && dir.ShouldIgnore(pass.Analyzer.Name) {
+				// skip due to ignore directive
+				continue
+			}
+
+			ifaceDecls[ts.Name.Name] = ts.Pos()
+
+			obj := pass.TypesInfo.Defs[ts.Name]
+			if obj == nil {
+				return
+			}
+
+			iface, ok := obj.Type().Underlying().(*types.Interface)
+			if !ok {
+				return
+			}
+
+			ifaceTypes[ts.Name.Name] = iface
+		}
+	})
+
+Loop:
+	for name, typ := range ifaceTypes {
+		for otherName, otherTyp := range ifaceTypes {
+			if name == otherName {
+				continue
+			}
+
+			if !types.Identical(typ, otherTyp) {
+				continue
+			}
+
+			if r.debug {
+				fmt.Println("Identical interface:", name, "and", otherName)
+			}
+
+			pass.Reportf(ifaceDecls[name], "interface %s contains identical methods or type constraints from another interface, causing redundancy", name)
+
+			continue Loop
+		}
+	}
+
+	return nil, nil
+}
diff --git a/vendor/github.com/uudashr/iface/internal/directive/directive.go b/vendor/github.com/uudashr/iface/internal/directive/directive.go
new file mode 100644
index 000000000..05c62928e
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/internal/directive/directive.go
@@ -0,0 +1,76 @@
+package directive
+
+import (
+	"go/ast"
+	"slices"
+	"strings"
+)
+
+// Ignore represent a special instruction embebded in the source code.
+//
+// The directive can be as simple as
+//
+//	//iface:ignore
+//
+// or consist of name
+//
+//	//iface:ignore=unused
+//
+// or multiple names
+//
+//	//iface:ignore=unused,identical
+type Ignore struct {
+	Names []string
+}
+
+// ParseIgnore parse the directive from the comments.
+func ParseIgnore(doc *ast.CommentGroup) *Ignore {
+	if doc == nil {
+		return nil
+	}
+
+	for _, comment := range doc.List {
+		text := strings.TrimSpace(comment.Text)
+		if text == "//iface:ignore" {
+			return &Ignore{}
+		}
+
+		// parse the Names if exists
+		if val, found := strings.CutPrefix(text, "//iface:ignore="); found {
+			val = strings.TrimSpace(val)
+			if val == "" {
+				return &Ignore{}
+			}
+
+			names := strings.Split(val, ",")
+			if len(names) == 0 {
+				continue
+			}
+
+			for i, name := range names {
+				names[i] = strings.TrimSpace(name)
+			}
+
+			if len(names) > 0 {
+				return &Ignore{Names: names}
+			}
+
+			return &Ignore{}
+		}
+	}
+
+	return nil
+}
+
+func (i *Ignore) hasName(name string) bool {
+	return slices.Contains(i.Names, name)
+}
+
+// ShouldIgnore return true if the name should be ignored.
+func (i *Ignore) ShouldIgnore(name string) bool {
+	if len(i.Names) == 0 {
+		return true
+	}
+
+	return i.hasName(name)
+}
diff --git a/vendor/github.com/uudashr/iface/opaque/doc.go b/vendor/github.com/uudashr/iface/opaque/doc.go
new file mode 100644
index 000000000..1e5a53897
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/opaque/doc.go
@@ -0,0 +1,3 @@
+// Package opaque defines an Analyzer to that detects interfaces that are used
+// to abstract a single concrete implementation only.
+package opaque
diff --git a/vendor/github.com/uudashr/iface/opaque/opaque.go b/vendor/github.com/uudashr/iface/opaque/opaque.go
new file mode 100644
index 000000000..fda0f001b
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/opaque/opaque.go
@@ -0,0 +1,321 @@
+package opaque
+
+import (
+	"fmt"
+	"go/ast"
+	"go/types"
+	"reflect"
+	"strings"
+
+	"github.com/uudashr/iface/internal/directive"
+	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/passes/inspect"
+	"golang.org/x/tools/go/ast/inspector"
+)
+
+// Analyzer is the opaque interface analyzer.
+var Analyzer = newAnalyzer()
+
+func newAnalyzer() *analysis.Analyzer {
+	r := runner{}
+
+	analyzer := &analysis.Analyzer{
+		Name:     "opaque",
+		Doc:      "Identifies functions that return interfaces, but the actual returned value is always a single concrete implementation.",
+		URL:      "https://pkg.go.dev/github.com/uudashr/iface/opaque",
+		Requires: []*analysis.Analyzer{inspect.Analyzer},
+		Run:      r.run,
+	}
+
+	analyzer.Flags.BoolVar(&r.debug, "debug", false, "enable debug mode")
+
+	return analyzer
+}
+
+type runner struct {
+	debug bool
+}
+
+func (r *runner) run(pass *analysis.Pass) (interface{}, error) {
+	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
+
+	// Find function declarations that return an interface
+
+	nodeFilter := []ast.Node{
+		(*ast.FuncDecl)(nil),
+	}
+
+	inspect.Preorder(nodeFilter, func(n ast.Node) {
+		funcDecl := n.(*ast.FuncDecl)
+
+		if funcDecl.Recv != nil {
+			// skip methods
+			return
+		}
+
+		if funcDecl.Type.Results == nil {
+			// skip functions without return values
+			return
+		}
+
+		if r.debug {
+			fmt.Printf("Function declaration %s\n", funcDecl.Name.Name)
+			fmt.Printf(" Results len=%d\n", len(funcDecl.Type.Results.List))
+		}
+
+		dir := directive.ParseIgnore(funcDecl.Doc)
+		if dir != nil && dir.ShouldIgnore(pass.Analyzer.Name) {
+			// skip ignored function
+			return
+		}
+
+		// Pre-check, only function that has interface return type will be processed
+		var hasInterfaceReturnType bool
+
+		var outCount int
+
+		for i, result := range funcDecl.Type.Results.List {
+			outInc := 1
+			if namesLen := len(result.Names); namesLen > 0 {
+				outInc = namesLen
+			}
+
+			outCount += outInc
+
+			resType := result.Type
+			typ := pass.TypesInfo.TypeOf(resType)
+
+			if r.debug {
+				fmt.Printf("  [%d] len=%d %v %v %v | %v %v interface=%t\n", i, len(result.Names), result.Names, resType, reflect.TypeOf(resType), typ, reflect.TypeOf(typ), types.IsInterface(typ))
+			}
+
+			if types.IsInterface(typ) && !hasInterfaceReturnType {
+				hasInterfaceReturnType = true
+			}
+		}
+
+		if r.debug {
+			fmt.Printf("  hasInterface=%t outCount=%d\n", hasInterfaceReturnType, outCount)
+		}
+
+		if !hasInterfaceReturnType {
+			// skip, since it has no interface return type
+			return
+		}
+
+		// Collect types on every return statement
+		retStmtTypes := make([]map[types.Type]struct{}, outCount)
+		for i := range retStmtTypes {
+			retStmtTypes[i] = make(map[types.Type]struct{})
+		}
+
+		ast.Inspect(funcDecl.Body, func(n ast.Node) bool {
+			switch n := n.(type) {
+			case *ast.FuncLit:
+				// ignore nested functions
+				return false
+			case *ast.ReturnStmt:
+				if r.debug {
+					fmt.Printf("  Return statements %v len=%d\n", n.Results, len(n.Results))
+				}
+
+				for i, result := range n.Results {
+					if r.debug {
+						fmt.Printf("   [%d] %v %v\n", i, result, reflect.TypeOf(result))
+					}
+
+					switch res := result.(type) {
+					case *ast.CallExpr:
+						if r.debug {
+							fmt.Printf("       CallExpr Fun: %v %v\n", res.Fun, reflect.TypeOf(res.Fun))
+						}
+
+						typ := pass.TypesInfo.TypeOf(res)
+						switch typ := typ.(type) {
+						case *types.Tuple:
+							for i := 0; i < typ.Len(); i++ {
+								v := typ.At(i)
+								vTyp := v.Type()
+								retStmtTypes[i][vTyp] = struct{}{}
+
+								if r.debug {
+									fmt.Printf("          Tuple [%d]: %v %v | %v %v interface=%t\n", i, v, reflect.TypeOf(v), vTyp, reflect.TypeOf(vTyp), types.IsInterface(vTyp))
+								}
+							}
+						default:
+							retStmtTypes[i][typ] = struct{}{}
+						}
+
+					case *ast.Ident:
+						if r.debug {
+							fmt.Printf("       Ident: %v %v\n", res, reflect.TypeOf(res))
+						}
+
+						typ := pass.TypesInfo.TypeOf(res)
+
+						if r.debug {
+							fmt.Printf("        Ident type: %v %v interface=%t\n", typ, reflect.TypeOf(typ), types.IsInterface(typ))
+						}
+
+						retStmtTypes[i][typ] = struct{}{}
+					case *ast.UnaryExpr:
+						if r.debug {
+							fmt.Printf("       UnaryExpr X: %v \n", res.X)
+						}
+
+						typ := pass.TypesInfo.TypeOf(res)
+
+						if r.debug {
+							fmt.Printf("        UnaryExpr type: %v %v interface=%t\n", typ, reflect.TypeOf(typ), types.IsInterface(typ))
+						}
+
+						retStmtTypes[i][typ] = struct{}{}
+					default:
+						if r.debug {
+							fmt.Printf("       Unknown: %v %v\n", res, reflect.TypeOf(res))
+						}
+
+						typ := pass.TypesInfo.TypeOf(res)
+						retStmtTypes[i][typ] = struct{}{}
+					}
+				}
+
+				return false
+			default:
+				return true
+			}
+		})
+
+		// Compare func return types with the return statement types
+		var nextIdx int
+
+		for _, result := range funcDecl.Type.Results.List {
+			resType := result.Type
+			typ := pass.TypesInfo.TypeOf(resType)
+
+			consumeCount := 1
+			if len(result.Names) > 0 {
+				consumeCount = len(result.Names)
+			}
+
+			currentIdx := nextIdx
+			nextIdx += consumeCount
+
+			// Check return type
+			if !types.IsInterface(typ) {
+				// it is a concrete type
+				continue
+			}
+
+			if typ.String() == "error" {
+				// very common case to have return type error
+				continue
+			}
+
+			if !fromSamePackage(pass, typ) {
+				// ignore interface from other package
+				continue
+			}
+
+			// Check statement type
+			stmtTyps := retStmtTypes[currentIdx]
+
+			stmtTypsSize := len(stmtTyps)
+			if stmtTypsSize > 1 {
+				// it has multiple implementation
+				continue
+			}
+
+			if stmtTypsSize == 0 {
+				// function use named return value, while return statement is empty
+				continue
+			}
+
+			var stmtTyp types.Type
+			for t := range stmtTyps {
+				// expect only one, we don't have to break it
+				stmtTyp = t
+			}
+
+			if types.IsInterface(stmtTyp) {
+				// not concrete type, skip
+				continue
+			}
+
+			if r.debug {
+				fmt.Printf("stmtType: %v %v | %v %v\n", stmtTyp, reflect.TypeOf(stmtTyp), stmtTyp.Underlying(), reflect.TypeOf(stmtTyp.Underlying()))
+			}
+
+			switch stmtTyp := stmtTyp.(type) {
+			case *types.Basic:
+				if stmtTyp.Kind() == types.UntypedNil {
+					// ignore nil
+					continue
+				}
+			case *types.Named:
+				if _, ok := stmtTyp.Underlying().(*types.Signature); ok {
+					// skip function type
+					continue
+				}
+			}
+
+			retTypeName := typ.String()
+			if fromSamePackage(pass, typ) {
+				retTypeName = removePkgPrefix(retTypeName)
+			}
+
+			stmtTypName := stmtTyp.String()
+			if fromSamePackage(pass, stmtTyp) {
+				stmtTypName = removePkgPrefix(stmtTypName)
+			}
+
+			pass.Reportf(result.Pos(),
+				"%s function return %s interface at the %s result, abstract a single concrete implementation of %s",
+				funcDecl.Name.Name,
+				retTypeName,
+				positionStr(currentIdx),
+				stmtTypName)
+		}
+	})
+
+	return nil, nil
+}
+
+func positionStr(idx int) string {
+	switch idx {
+	case 0:
+		return "1st"
+	case 1:
+		return "2nd"
+	case 2:
+		return "3rd"
+	default:
+		return fmt.Sprintf("%dth", idx+1)
+	}
+}
+
+func fromSamePackage(pass *analysis.Pass, typ types.Type) bool {
+	switch typ := typ.(type) {
+	case *types.Named:
+		currentPkg := pass.Pkg
+		ifacePkg := typ.Obj().Pkg()
+
+		return currentPkg == ifacePkg
+	case *types.Pointer:
+		return fromSamePackage(pass, typ.Elem())
+	default:
+		return false
+	}
+}
+
+func removePkgPrefix(typeStr string) string {
+	if typeStr[0] == '*' {
+		return "*" + removePkgPrefix(typeStr[1:])
+	}
+
+	if lastDot := strings.LastIndex(typeStr, "."); lastDot != -1 {
+		return typeStr[lastDot+1:]
+	}
+
+	return typeStr
+}
diff --git a/vendor/github.com/uudashr/iface/unused/doc.go b/vendor/github.com/uudashr/iface/unused/doc.go
new file mode 100644
index 000000000..d5b6f24bb
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/unused/doc.go
@@ -0,0 +1,3 @@
+// Package unused defines an Analyzer that indetifies interfaces that are not
+// used anywhere in the same package where the interface is defined.
+package unused
diff --git a/vendor/github.com/uudashr/iface/unused/unused.go b/vendor/github.com/uudashr/iface/unused/unused.go
new file mode 100644
index 000000000..c2efbf52c
--- /dev/null
+++ b/vendor/github.com/uudashr/iface/unused/unused.go
@@ -0,0 +1,138 @@
+package unused
+
+import (
+	"fmt"
+	"go/ast"
+	"go/token"
+	"reflect"
+	"slices"
+	"strings"
+
+	"github.com/uudashr/iface/internal/directive"
+	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/passes/inspect"
+	"golang.org/x/tools/go/ast/inspector"
+)
+
+// Analyzer is the unused interface analyzer.
+var Analyzer = newAnalyzer()
+
+func newAnalyzer() *analysis.Analyzer {
+	r := runner{}
+
+	analyzer := &analysis.Analyzer{
+		Name:     "unused",
+		Doc:      "Identifies interfaces that are not used anywhere in the same package where the interface is defined",
+		URL:      "https://pkg.go.dev/github.com/uudashr/iface/unused",
+		Requires: []*analysis.Analyzer{inspect.Analyzer},
+		Run:      r.run,
+	}
+
+	analyzer.Flags.BoolVar(&r.debug, "debug", false, "enable debug mode")
+	analyzer.Flags.StringVar(&r.exclude, "exclude", "", "comma-separated list of packages to exclude from the check")
+
+	return analyzer
+}
+
+type runner struct {
+	debug   bool
+	exclude string
+}
+
+func (r *runner) run(pass *analysis.Pass) (interface{}, error) {
+	excludes := strings.Split(r.exclude, ",")
+	if slices.Contains(excludes, pass.Pkg.Path()) {
+		return nil, nil
+	}
+
+	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
+
+	// Collect all interface type declarations
+	ifaceDecls := make(map[string]token.Pos)
+
+	nodeFilter := []ast.Node{
+		(*ast.GenDecl)(nil),
+	}
+
+	inspect.Preorder(nodeFilter, func(n ast.Node) {
+		decl, ok := n.(*ast.GenDecl)
+		if !ok {
+			return
+		}
+
+		if r.debug {
+			fmt.Printf("GenDecl: %v specs=%d\n", decl.Tok, len(decl.Specs))
+		}
+
+		if decl.Tok != token.TYPE {
+			return
+		}
+
+		for i, spec := range decl.Specs {
+			if r.debug {
+				fmt.Printf(" spec[%d]: %v %v\n", i, spec, reflect.TypeOf(spec))
+			}
+
+			ts, ok := spec.(*ast.TypeSpec)
+			if !ok {
+				continue
+			}
+
+			_, ok = ts.Type.(*ast.InterfaceType)
+			if !ok {
+				return
+			}
+
+			if r.debug {
+				fmt.Println(" Interface type declaration:", ts.Name.Name, ts.Pos())
+			}
+
+			dir := directive.ParseIgnore(decl.Doc)
+			if dir != nil && dir.ShouldIgnore(pass.Analyzer.Name) {
+				// skip due to ignore directive
+				continue
+			}
+
+			ifaceDecls[ts.Name.Name] = ts.Pos()
+		}
+	})
+
+	if r.debug {
+		var ifaceNames []string
+		for name := range ifaceDecls {
+			ifaceNames = append(ifaceNames, name)
+		}
+
+		fmt.Println("Declared interfaces:", ifaceNames)
+	}
+
+	// Inspect whether the interface is used within the package
+	nodeFilter = []ast.Node{
+		(*ast.Ident)(nil),
+	}
+
+	inspect.Preorder(nodeFilter, func(n ast.Node) {
+		ident, ok := n.(*ast.Ident)
+		if !ok {
+			return
+		}
+
+		pos := ifaceDecls[ident.Name]
+		if pos == ident.Pos() {
+			// The identifier is the interface type declaration
+			return
+		}
+
+		delete(ifaceDecls, ident.Name)
+	})
+
+	if r.debug {
+		fmt.Printf("Package %s %s\n", pass.Pkg.Path(), pass.Pkg.Name())
+	}
+
+	for name, pos := range ifaceDecls {
+		pass.Reportf(pos, "interface %s is declared but not used within the package", name)
+	}
+
+	return nil, nil
+}