chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

build/openapi3gen/convert.go

@@ -0,0 +1,386 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package openapi3gen
+
+import (
+	"fmt"
+	"regexp"
+	"sort"
+	"strings"
+
+	"gitea.dev/modules/json"
+
+	"github.com/getkin/kin-openapi/openapi2"
+	"github.com/getkin/kin-openapi/openapi2conv"
+	"github.com/getkin/kin-openapi/openapi3"
+)
+
+// rxDeprecated matches "deprecated" as a word at the start of a description
+// or preceded by whitespace/punctuation that indicates a leading marker (e.g.
+// "Deprecated: true", "deprecated (use X instead)"). Rejects negated phrases
+// like "not deprecated" or "previously deprecated, now supported".
+var rxDeprecated = regexp.MustCompile(`(?i)(?:^|[\n.;])\s*deprecated\b`)
+
+// Convert parses a Swagger 2.0 spec and returns an OAS3 spec, applying
+// Gitea-specific post-processing: file-schema fixups, URI formats,
+// deprecated flags, and shared-enum extraction.
+//
+// astEnumMap is a value-set-key → Go-type-name(s) map (built by
+// ScanSwaggerEnumTypes). When a value set is shared by multiple Go types,
+// per-property disambiguation uses the x-go-enum-desc extension. If a shared
+// enum in the spec has no matching entry, Convert returns an error — no
+// fallback naming.
+func Convert(swaggerJSON []byte, astEnumMap map[string][]string) (*openapi3.T, error) {
+	var swagger2 openapi2.T
+	if err := json.Unmarshal(swaggerJSON, &swagger2); err != nil {
+		return nil, fmt.Errorf("parsing swagger 2.0: %w", err)
+	}
+
+	oas3, err := openapi2conv.ToV3(&swagger2)
+	if err != nil {
+		return nil, fmt.Errorf("converting to openapi 3.0: %w", err)
+	}
+
+	fixFileSchemas(oas3)
+	addURIFormats(oas3)
+	addDeprecatedFlags(oas3)
+	if err := extractSharedEnums(oas3, astEnumMap); err != nil {
+		return nil, err
+	}
+	return oas3, nil
+}
+
+func fixFileSchemas(doc *openapi3.T) {
+	for _, pathItem := range doc.Paths.Map() {
+		for _, op := range []*openapi3.Operation{
+			pathItem.Get, pathItem.Post, pathItem.Put, pathItem.Patch,
+			pathItem.Delete, pathItem.Head, pathItem.Options, pathItem.Trace,
+		} {
+			if op == nil {
+				continue
+			}
+			for _, resp := range op.Responses.Map() {
+				if resp.Value == nil {
+					continue
+				}
+				for _, mediaType := range resp.Value.Content {
+					fixSchema(mediaType.Schema)
+				}
+			}
+			if op.RequestBody != nil && op.RequestBody.Value != nil {
+				for _, mediaType := range op.RequestBody.Value.Content {
+					fixSchema(mediaType.Schema)
+				}
+			}
+		}
+	}
+}
+
+// fixSchema rewrites any "type: file" schemas to the OAS3 equivalent
+// (type: string, format: binary), recursing into Properties, Items, and
+// AllOf/OneOf/AnyOf/Not branches. $ref nodes are skipped so shared schemas
+// are rewritten exactly once when visited through their declaration.
+func fixSchema(ref *openapi3.SchemaRef) {
+	if ref == nil || ref.Value == nil || ref.Ref != "" {
+		return
+	}
+	s := ref.Value
+	if s.Type.Is("file") {
+		s.Type = &openapi3.Types{"string"}
+		s.Format = "binary"
+	}
+	for _, p := range s.Properties {
+		fixSchema(p)
+	}
+	fixSchema(s.Items)
+	for _, sub := range s.AllOf {
+		fixSchema(sub)
+	}
+	for _, sub := range s.OneOf {
+		fixSchema(sub)
+	}
+	for _, sub := range s.AnyOf {
+		fixSchema(sub)
+	}
+	fixSchema(s.Not)
+}
+
+// addURIFormats sets format: uri on string properties whose names indicate
+// they hold URLs. This information is lost in Swagger 2.0 but is valuable
+// for code generators.
+func addURIFormats(doc *openapi3.T) {
+	if doc.Components == nil {
+		return
+	}
+	for _, schemaRef := range doc.Components.Schemas {
+		if schemaRef.Value == nil {
+			continue
+		}
+		for propName, propRef := range schemaRef.Value.Properties {
+			if propRef == nil || propRef.Value == nil || propRef.Ref != "" {
+				continue
+			}
+			prop := propRef.Value
+			if !prop.Type.Is("string") || prop.Format != "" {
+				continue
+			}
+			if isURLProperty(propName) {
+				prop.Format = "uri"
+			}
+		}
+	}
+}
+
+func isURLProperty(name string) bool {
+	if strings.HasSuffix(name, "_url") {
+		return true
+	}
+	switch name {
+	case "url", "html_url", "clone_url":
+		return true
+	}
+	return false
+}
+
+// addDeprecatedFlags sets deprecated: true on schema properties whose
+// description starts with a "deprecated" marker (e.g. "Deprecated: true"
+// or "deprecated (use X instead)"). Does not match negated phrases.
+func addDeprecatedFlags(doc *openapi3.T) {
+	if doc.Components == nil {
+		return
+	}
+	for _, schemaRef := range doc.Components.Schemas {
+		if schemaRef.Value == nil {
+			continue
+		}
+		for _, propRef := range schemaRef.Value.Properties {
+			if propRef == nil || propRef.Value == nil || propRef.Ref != "" {
+				continue
+			}
+			if rxDeprecated.MatchString(propRef.Value.Description) {
+				propRef.Value.Deprecated = true
+			}
+		}
+	}
+}
+
+type enumUsage struct {
+	schemaName string
+	propName   string
+	propRef    *openapi3.SchemaRef
+	inItems    bool
+}
+
+// extractSharedEnums finds identical enum arrays used by multiple schema
+// properties, creates a standalone named schema for each, and replaces
+// the inline enums with $ref pointers.
+//
+// If the derived enum name collides with an existing component schema, or
+// no // swagger:enum annotation matches the value set, generation aborts
+// with an actionable error — there are no silent fallbacks.
+func extractSharedEnums(doc *openapi3.T, astEnumMap map[string][]string) error {
+	if doc.Components == nil {
+		return nil
+	}
+
+	type groupKey struct {
+		valueSet string
+		typeName string
+	}
+	enumGroups := map[groupKey][]enumUsage{}
+	groupOrder := []groupKey{} // deterministic iteration
+
+	addUsage := func(key groupKey, u enumUsage) {
+		if _, seen := enumGroups[key]; !seen {
+			groupOrder = append(groupOrder, key)
+		}
+		enumGroups[key] = append(enumGroups[key], u)
+	}
+
+	for schemaName, schemaRef := range doc.Components.Schemas {
+		if schemaRef.Value == nil {
+			continue
+		}
+		for propName, propRef := range schemaRef.Value.Properties {
+			if propRef == nil || propRef.Value == nil || propRef.Ref != "" {
+				continue
+			}
+			if len(propRef.Value.Enum) > 1 && propRef.Value.Type.Is("string") {
+				key := groupKey{
+					valueSet: EnumKey(propRef.Value.Enum),
+					typeName: extractEnumTypeName(propRef.Value, astEnumMap),
+				}
+				addUsage(key, enumUsage{schemaName, propName, propRef, false})
+			}
+			if propRef.Value.Type.Is("array") && propRef.Value.Items != nil &&
+				propRef.Value.Items.Value != nil && propRef.Value.Items.Ref == "" &&
+				len(propRef.Value.Items.Value.Enum) > 1 && propRef.Value.Items.Value.Type.Is("string") {
+				key := groupKey{
+					valueSet: EnumKey(propRef.Value.Items.Value.Enum),
+					typeName: extractEnumTypeName(propRef.Value.Items.Value, astEnumMap),
+				}
+				addUsage(key, enumUsage{schemaName, propName, propRef, true})
+			}
+		}
+	}
+
+	for _, key := range groupOrder {
+		usages := enumGroups[key]
+		if len(usages) < 2 {
+			continue
+		}
+
+		enumName, err := deriveEnumName(key.valueSet, key.typeName, usages, astEnumMap)
+		if err != nil {
+			return err
+		}
+		if _, exists := doc.Components.Schemas[enumName]; exists {
+			return fmt.Errorf("enum name collision: %s already exists as a component schema", enumName)
+		}
+
+		var enumValues []any
+		if usages[0].inItems {
+			enumValues = usages[0].propRef.Value.Items.Value.Enum
+		} else {
+			enumValues = usages[0].propRef.Value.Enum
+		}
+
+		doc.Components.Schemas[enumName] = &openapi3.SchemaRef{
+			Value: &openapi3.Schema{
+				Type: &openapi3.Types{"string"},
+				Enum: enumValues,
+			},
+		}
+
+		ref := "#/components/schemas/" + enumName
+
+		for _, usage := range usages {
+			if usage.inItems {
+				usage.propRef.Value.Items = &openapi3.SchemaRef{Ref: ref}
+			} else {
+				old := usage.propRef.Value
+				if old.Description == "" && !old.Deprecated && old.Format == "" {
+					usage.propRef.Ref = ref
+					usage.propRef.Value = nil
+				} else {
+					usage.propRef.Value = &openapi3.Schema{
+						AllOf: openapi3.SchemaRefs{
+							{Ref: ref},
+						},
+						Description: old.Description,
+						Deprecated:  old.Deprecated,
+						Format:      old.Format,
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// deriveEnumName looks up a shared enum's Go type name. If typeName is
+// non-empty (because we recovered it from x-go-enum-desc), it is used
+// directly. Otherwise the value-set must map to exactly one known type. On
+// failure, returns an error identifying the offending properties.
+func deriveEnumName(key, typeName string, usages []enumUsage, astEnumMap map[string][]string) (string, error) {
+	if typeName != "" {
+		return typeName, nil
+	}
+	names := astEnumMap[key]
+	if len(names) == 1 {
+		return names[0], nil
+	}
+
+	props := map[string]bool{}
+	for _, u := range usages {
+		props[fmt.Sprintf("%s.%s", u.schemaName, u.propName)] = true
+	}
+	propList := make([]string, 0, len(props))
+	for p := range props {
+		propList = append(propList, p)
+	}
+	if len(names) > 1 {
+		return "", fmt.Errorf(
+			"value-set %q is shared by multiple swagger:enum types %v and could not be disambiguated for properties: %v; "+
+				"ensure go-swagger emits x-go-enum-desc for those properties",
+			key, names, propList,
+		)
+	}
+	return "", fmt.Errorf(
+		"no swagger:enum annotation matches value-set %q used by %d properties: %v; "+
+			"fix by adding a named string type with // swagger:enum to modules/structs or modules/commitstatus",
+		key, len(usages), propList,
+	)
+}
+
+// extractEnumTypeName recovers the Go type name a schema's enum came from by
+// parsing the property's x-go-enum-desc extension. go-swagger emits one line
+// per value as "<value> <ConstName>[ <free text>]"; the type is the longest
+// common prefix of the const names, narrowed to the candidate set in
+// astEnumMap. Returns "" if extraction is inconclusive.
+func extractEnumTypeName(s *openapi3.Schema, astEnumMap map[string][]string) string {
+	if s == nil || s.Extensions == nil {
+		return ""
+	}
+	raw, ok := s.Extensions["x-go-enum-desc"]
+	if !ok {
+		return ""
+	}
+	desc, ok := raw.(string)
+	if !ok {
+		return ""
+	}
+	candidates := astEnumMap[EnumKey(s.Enum)]
+	if len(candidates) == 0 {
+		return ""
+	}
+	// Collect the const names (second whitespace-separated field per line).
+	var consts []string
+	for line := range strings.SplitSeq(desc, "\n") {
+		fields := strings.Fields(line)
+		if len(fields) >= 2 {
+			consts = append(consts, fields[1])
+		}
+	}
+	if len(consts) == 0 {
+		return ""
+	}
+	// A candidate matches when it is a prefix of every const name AND the
+	// first character after the prefix is an uppercase ASCII letter — this
+	// rejects e.g. "Alpha" matching "Alphabet" (suffix "bet" starts lower)
+	// while still accepting both "Alpha" and "AlphaPlus" against "AlphaPlusX"
+	// (both prefixes valid). The most specific (longest) wins; ties return
+	// "" so deriveEnumName surfaces the ambiguity rather than silently
+	// picking a winner.
+	ordered := append([]string(nil), candidates...)
+	sort.Slice(ordered, func(i, j int) bool { return len(ordered[i]) > len(ordered[j]) })
+	var matches []string
+	for _, name := range ordered {
+		ok := true
+		for _, c := range consts {
+			if !strings.HasPrefix(c, name) {
+				ok = false
+				break
+			}
+			suffix := c[len(name):]
+			// Empty suffix means the const name exactly equals the type name — valid exact match.
+			// A non-empty suffix must begin with an uppercase letter to reject incidental
+			// prefix matches (e.g. "Alpha" should not match "Alphabet").
+			if len(suffix) > 0 && (suffix[0] < 'A' || suffix[0] > 'Z') {
+				ok = false
+				break
+			}
+		}
+		if ok {
+			matches = append(matches, name)
+		}
+	}
+	if len(matches) == 0 {
+		return ""
+	}
+	if len(matches) > 1 && len(matches[0]) == len(matches[1]) {
+		return ""
+	}
+	return matches[0]
+}

build/openapi3gen/convert_test.go

@@ -0,0 +1,218 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package openapi3gen
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/getkin/kin-openapi/openapi3"
+)
+
+func TestDeriveEnumName_hit(t *testing.T) {
+	key := EnumKey([]any{"red", "green", "blue"})
+	astMap := map[string][]string{key: {"Color"}}
+	usages := []enumUsage{{schemaName: "Paint", propName: "color"}}
+	got, err := deriveEnumName(key, "", usages, astMap)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != "Color" {
+		t.Fatalf("got %q, want %q", got, "Color")
+	}
+}
+
+func TestDeriveEnumName_miss(t *testing.T) {
+	key := EnumKey([]any{"x", "y"})
+	usages := []enumUsage{{schemaName: "Thing", propName: "kind"}}
+	_, err := deriveEnumName(key, "", usages, map[string][]string{})
+	if err == nil {
+		t.Fatal("expected miss error, got nil")
+	}
+	msg := err.Error()
+	if !strings.Contains(msg, "Thing.kind") {
+		t.Fatalf("error %q should list the missing usage", msg)
+	}
+	if !strings.Contains(msg, "swagger:enum") {
+		t.Fatalf("error %q should hint at the fix", msg)
+	}
+}
+
+func TestExtractSharedEnums_usesASTMap(t *testing.T) {
+	doc := &openapi3.T{
+		Components: &openapi3.Components{
+			Schemas: openapi3.Schemas{
+				"A": {Value: &openapi3.Schema{
+					Type: &openapi3.Types{"object"},
+					Properties: openapi3.Schemas{
+						"color": {Value: &openapi3.Schema{
+							Type: &openapi3.Types{"string"},
+							Enum: []any{"red", "green", "blue"},
+						}},
+					},
+				}},
+				"B": {Value: &openapi3.Schema{
+					Type: &openapi3.Types{"object"},
+					Properties: openapi3.Schemas{
+						"color": {Value: &openapi3.Schema{
+							Type: &openapi3.Types{"string"},
+							Enum: []any{"red", "green", "blue"},
+						}},
+					},
+				}},
+			},
+		},
+	}
+	astMap := map[string][]string{EnumKey([]any{"red", "green", "blue"}): {"Color"}}
+	if err := extractSharedEnums(doc, astMap); err != nil {
+		t.Fatalf("extractSharedEnums: %v", err)
+	}
+	if _, ok := doc.Components.Schemas["Color"]; !ok {
+		t.Fatalf("expected Color schema to be extracted")
+	}
+}
+
+func TestFixFileSchemas_recursesIntoNested(t *testing.T) {
+	fileType := func() *openapi3.SchemaRef {
+		return &openapi3.SchemaRef{Value: &openapi3.Schema{Type: &openapi3.Types{"file"}}}
+	}
+	doc := &openapi3.T{
+		Paths: openapi3.NewPaths(),
+	}
+	doc.Paths.Set("/upload", &openapi3.PathItem{
+		Post: &openapi3.Operation{
+			RequestBody: &openapi3.RequestBodyRef{
+				Value: &openapi3.RequestBody{
+					Content: openapi3.Content{
+						"multipart/form-data": {
+							Schema: &openapi3.SchemaRef{Value: &openapi3.Schema{
+								Type: &openapi3.Types{"object"},
+								Properties: openapi3.Schemas{
+									"attachment": fileType(),
+									"items": {Value: &openapi3.Schema{
+										Type:  &openapi3.Types{"array"},
+										Items: fileType(),
+									}},
+									"alt": {Value: &openapi3.Schema{
+										AllOf: openapi3.SchemaRefs{fileType()},
+									}},
+									"one": {Value: &openapi3.Schema{
+										OneOf: openapi3.SchemaRefs{fileType()},
+									}},
+									"any": {Value: &openapi3.Schema{
+										AnyOf: openapi3.SchemaRefs{fileType()},
+									}},
+									"not": {Value: &openapi3.Schema{
+										Not: fileType(),
+									}},
+								},
+							}},
+						},
+					},
+				},
+			},
+			Responses: openapi3.NewResponses(),
+		},
+	})
+
+	fixFileSchemas(doc)
+
+	props := doc.Paths.Value("/upload").Post.RequestBody.Value.Content["multipart/form-data"].Schema.Value.Properties
+	if !props["attachment"].Value.Type.Is("string") || props["attachment"].Value.Format != "binary" {
+		t.Errorf("nested property not fixed: %+v", props["attachment"].Value)
+	}
+	if !props["items"].Value.Items.Value.Type.Is("string") || props["items"].Value.Items.Value.Format != "binary" {
+		t.Errorf("array items not fixed: %+v", props["items"].Value.Items.Value)
+	}
+	if !props["alt"].Value.AllOf[0].Value.Type.Is("string") || props["alt"].Value.AllOf[0].Value.Format != "binary" {
+		t.Errorf("allOf branch not fixed: %+v", props["alt"].Value.AllOf[0].Value)
+	}
+	if !props["one"].Value.OneOf[0].Value.Type.Is("string") || props["one"].Value.OneOf[0].Value.Format != "binary" {
+		t.Errorf("oneOf branch not fixed: %+v", props["one"].Value.OneOf[0].Value)
+	}
+	if !props["any"].Value.AnyOf[0].Value.Type.Is("string") || props["any"].Value.AnyOf[0].Value.Format != "binary" {
+		t.Errorf("anyOf branch not fixed: %+v", props["any"].Value.AnyOf[0].Value)
+	}
+	if !props["not"].Value.Not.Value.Type.Is("string") || props["not"].Value.Not.Value.Format != "binary" {
+		t.Errorf("not branch not fixed: %+v", props["not"].Value.Not.Value)
+	}
+}
+
+func TestExtractEnumTypeName_TeamVisibility(t *testing.T) {
+	enum := []any{"public", "limited", "private"}
+	key := EnumKey(enum)
+	astMap := map[string][]string{key: {"UserVisibility", "TeamVisibility"}}
+	schema := &openapi3.Schema{
+		Type: &openapi3.Types{"string"},
+		Enum: enum,
+		Extensions: map[string]any{
+			"x-go-enum-desc": "public TeamVisibilityPublic\nlimited TeamVisibilityLimited\nprivate TeamVisibilityPrivate",
+		},
+	}
+	if got := extractEnumTypeName(schema, astMap); got != "TeamVisibility" {
+		t.Fatalf("got %q, want %q", got, "TeamVisibility")
+	}
+}
+
+func TestExtractEnumTypeName_ambiguousPrefixTie(t *testing.T) {
+	enum := []any{"one", "two"}
+	key := EnumKey(enum)
+	astMap := map[string][]string{key: {"AB", "AC"}}
+	schema := &openapi3.Schema{
+		Type: &openapi3.Types{"string"},
+		Enum: enum,
+		Extensions: map[string]any{
+			"x-go-enum-desc": "one ABOne\ntwo ACTwo",
+		},
+	}
+	if got := extractEnumTypeName(schema, astMap); got != "" {
+		t.Fatalf("got %q, want empty string for ambiguous tie", got)
+	}
+}
+
+func TestExtractEnumTypeName_rejectsIncidentalPrefix(t *testing.T) {
+	enum := []any{"a", "b"}
+	key := EnumKey(enum)
+	astMap := map[string][]string{key: {"Alpha", "Alphabet"}}
+	schema := &openapi3.Schema{
+		Type: &openapi3.Types{"string"},
+		Enum: enum,
+		Extensions: map[string]any{
+			"x-go-enum-desc": "a AlphabetA\nb AlphabetB",
+		},
+	}
+	if got := extractEnumTypeName(schema, astMap); got != "Alphabet" {
+		t.Fatalf("got %q, want %q", got, "Alphabet")
+	}
+}
+
+func TestExtractSharedEnums_missReturnsError(t *testing.T) {
+	doc := &openapi3.T{
+		Components: &openapi3.Components{
+			Schemas: openapi3.Schemas{
+				"A": {Value: &openapi3.Schema{
+					Type: &openapi3.Types{"object"},
+					Properties: openapi3.Schemas{
+						"color": {Value: &openapi3.Schema{
+							Type: &openapi3.Types{"string"},
+							Enum: []any{"red", "green"},
+						}},
+					},
+				}},
+				"B": {Value: &openapi3.Schema{
+					Type: &openapi3.Types{"object"},
+					Properties: openapi3.Schemas{
+						"color": {Value: &openapi3.Schema{
+							Type: &openapi3.Types{"string"},
+							Enum: []any{"red", "green"},
+						}},
+					},
+				}},
+			},
+		},
+	}
+	if err := extractSharedEnums(doc, map[string][]string{}); err == nil {
+		t.Fatal("expected miss error")
+	}
+}

build/openapi3gen/enumscan.go

@@ -0,0 +1,192 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+// Package openapi3gen converts Gitea's Swagger 2.0 spec to an OpenAPI 3.0
+// spec. It discovers Go enum type names by scanning swagger:enum annotations
+// in the source tree, then names extracted shared-enum schemas accordingly.
+package openapi3gen
+
+import (
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// EnumKey returns a canonical key for a set of enum values: values are
+// stringified, sorted, and joined with "|". Used to match enum value sets
+// across spec properties and scanned Go type declarations.
+func EnumKey(values []any) string {
+	strs := make([]string, len(values))
+	for i, v := range values {
+		strs[i] = fmt.Sprintf("%v", v)
+	}
+	sort.Strings(strs)
+	return strings.Join(strs, "|")
+}
+
+var rxSwaggerEnum = regexp.MustCompile(`swagger:enum\s+(\w+)`)
+
+// ScanSwaggerEnumTypes walks .go files under each dir and returns a map from
+// a canonical value-set key (see EnumKey) to the Go type names declared with
+// // swagger:enum TypeName. Multiple type names per key are allowed (e.g.
+// distinct enum types that happen to share a value set such as
+// {public, limited, private}); callers must disambiguate per-usage (typically
+// by parsing the property's x-go-enum-desc extension to recover the const
+// type prefix).
+//
+// Returns an error on parse failure or on an annotation for a type whose
+// constants can't be extracted.
+func ScanSwaggerEnumTypes(dirs []string) (map[string][]string, error) {
+	fset := token.NewFileSet()
+	parsed := []*ast.File{}
+
+	for _, dir := range dirs {
+		entries, err := os.ReadDir(dir)
+		if err != nil {
+			return nil, fmt.Errorf("reading %s: %w", dir, err)
+		}
+		for _, entry := range entries {
+			if entry.IsDir() || !strings.HasSuffix(entry.Name(), ".go") {
+				continue
+			}
+			if strings.HasSuffix(entry.Name(), "_test.go") {
+				continue
+			}
+			path := filepath.Join(dir, entry.Name())
+			file, err := parser.ParseFile(fset, path, nil, parser.ParseComments)
+			if err != nil {
+				return nil, fmt.Errorf("%s: %w", path, err)
+			}
+			parsed = append(parsed, file)
+		}
+	}
+
+	enumTypes := map[string]string{} // typeName → "" (presence marker)
+	enumValues := map[string][]any{} // typeName → values
+
+	// Pass 1: collect every // swagger:enum TypeName declaration.
+	for _, file := range parsed {
+		for _, decl := range file.Decls {
+			gd, ok := decl.(*ast.GenDecl)
+			if !ok || gd.Tok != token.TYPE {
+				continue
+			}
+			if err := collectEnumType(gd, enumTypes); err != nil {
+				return nil, fmt.Errorf("%s: %w", fset.Position(gd.Pos()).Filename, err)
+			}
+		}
+	}
+
+	// Pass 2: collect const values; now every annotated type is visible.
+	for _, file := range parsed {
+		for _, decl := range file.Decls {
+			gd, ok := decl.(*ast.GenDecl)
+			if !ok || gd.Tok != token.CONST {
+				continue
+			}
+			collectEnumValues(gd, enumTypes, enumValues)
+		}
+	}
+
+	result := map[string][]string{}
+	for typeName := range enumTypes {
+		values, ok := enumValues[typeName]
+		if !ok || len(values) == 0 {
+			return nil, fmt.Errorf("swagger:enum %s has no const block with typed string values", typeName)
+		}
+		key := EnumKey(values)
+		result[key] = append(result[key], typeName)
+	}
+	for key, names := range result {
+		sort.Strings(names)
+		result[key] = names
+	}
+	return result, nil
+}
+
+// collectEnumType scans a `type` GenDecl for // swagger:enum annotations,
+// handling both the lone form (`// swagger:enum Foo\n type Foo string`)
+// where the comment group is attached to the GenDecl, and the grouped form:
+//
+//	type (
+//	    // swagger:enum Foo
+//	    Foo string
+//	)
+//
+// where the comment group is attached to each TypeSpec. Caveat: Go's parser
+// only attaches a CommentGroup when it is immediately adjacent to the decl.
+// A blank line (not a `//` continuation line) between the comment and the
+// declaration drops the Doc, so annotations MUST sit directly above their
+// type. All current annotated files obey this — the rule is noted here so
+// a future edit that inserts a blank line fails fast rather than silently.
+func collectEnumType(gd *ast.GenDecl, enumTypes map[string]string) error {
+	if err := registerEnumAnnotation(gd.Doc, gd.Specs, enumTypes); err != nil {
+		return err
+	}
+	for _, spec := range gd.Specs {
+		ts, ok := spec.(*ast.TypeSpec)
+		if !ok || ts.Doc == nil {
+			continue
+		}
+		if err := registerEnumAnnotation(ts.Doc, []ast.Spec{ts}, enumTypes); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func registerEnumAnnotation(doc *ast.CommentGroup, specs []ast.Spec, enumTypes map[string]string) error {
+	if doc == nil {
+		return nil
+	}
+	matches := rxSwaggerEnum.FindStringSubmatch(doc.Text())
+	if len(matches) < 2 {
+		return nil
+	}
+	annotated := matches[1]
+	for _, spec := range specs {
+		ts, ok := spec.(*ast.TypeSpec)
+		if !ok {
+			continue
+		}
+		if ts.Name.Name == annotated {
+			enumTypes[annotated] = ""
+			return nil
+		}
+	}
+	return fmt.Errorf("swagger:enum %s: no type declaration with that name in the same decl group; check for a typo", annotated)
+}
+
+func collectEnumValues(gd *ast.GenDecl, enumTypes map[string]string, enumValues map[string][]any) {
+	for _, spec := range gd.Specs {
+		vs, ok := spec.(*ast.ValueSpec)
+		if !ok || vs.Type == nil {
+			continue
+		}
+		ident, ok := vs.Type.(*ast.Ident)
+		if !ok {
+			continue
+		}
+		if _, isEnum := enumTypes[ident.Name]; !isEnum {
+			continue
+		}
+		for _, val := range vs.Values {
+			lit, ok := val.(*ast.BasicLit)
+			if !ok || lit.Kind != token.STRING {
+				continue
+			}
+			unquoted, err := strconv.Unquote(lit.Value)
+			if err != nil {
+				continue
+			}
+			enumValues[ident.Name] = append(enumValues[ident.Name], unquoted)
+		}
+	}
+}

build/openapi3gen/enumscan_test.go

@@ -0,0 +1,249 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package openapi3gen
+
+import (
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"testing"
+)
+
+func single(got map[string][]string, key string) string {
+	v := got[key]
+	if len(v) != 1 {
+		return ""
+	}
+	return v[0]
+}
+
+func TestEnumKey_sortsAndJoins(t *testing.T) {
+	key := EnumKey([]any{"b", "a", "c"})
+	if key != "a|b|c" {
+		t.Fatalf("EnumKey = %q, want %q", key, "a|b|c")
+	}
+}
+
+func TestEnumKey_handlesNonStringValues(t *testing.T) {
+	key := EnumKey([]any{2, 1, 3})
+	if key != "1|2|3" {
+		t.Fatalf("EnumKey = %q, want %q", key, "1|2|3")
+	}
+}
+
+func TestScanSwaggerEnumTypes_basic(t *testing.T) {
+	dir := t.TempDir()
+	src := `package fixture
+
+// Color is a primary color.
+// swagger:enum Color
+type Color string
+
+const (
+	ColorRed   Color = "red"
+	ColorGreen Color = "green"
+	ColorBlue  Color = "blue"
+)
+`
+	if err := os.WriteFile(filepath.Join(dir, "color.go"), []byte(src), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := ScanSwaggerEnumTypes([]string{dir})
+	if err != nil {
+		t.Fatalf("ScanSwaggerEnumTypes: %v", err)
+	}
+	wantKey := EnumKey([]any{"red", "green", "blue"})
+	if single(got, wantKey) != "Color" {
+		t.Fatalf("map[%q] = %q, want %q", wantKey, got[wantKey], "Color")
+	}
+}
+
+func TestScanSwaggerEnumTypes_orphanAnnotation(t *testing.T) {
+	dir := t.TempDir()
+	src := `package fixture
+
+// swagger:enum Sttype
+type StateType string
+
+const (
+	StateOpen StateType = "open"
+)
+`
+	if err := os.WriteFile(filepath.Join(dir, "typo.go"), []byte(src), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err := ScanSwaggerEnumTypes([]string{dir})
+	if err == nil {
+		t.Fatal("expected error for annotation referencing a non-matching type name")
+	}
+	if !strings.Contains(err.Error(), "Sttype") {
+		t.Fatalf("error %q should mention the typo'd name Sttype", err.Error())
+	}
+}
+
+func TestScanSwaggerEnumTypes_collision(t *testing.T) {
+	dir := t.TempDir()
+	src := `package fixture
+
+// swagger:enum Alpha
+type Alpha string
+const (
+	AlphaX Alpha = "x"
+	AlphaY Alpha = "y"
+)
+
+// swagger:enum Beta
+type Beta string
+const (
+	BetaX Beta = "x"
+	BetaY Beta = "y"
+)
+`
+	if err := os.WriteFile(filepath.Join(dir, "dup.go"), []byte(src), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := ScanSwaggerEnumTypes([]string{dir})
+	if err != nil {
+		t.Fatalf("ScanSwaggerEnumTypes: %v", err)
+	}
+	key := EnumKey([]any{"x", "y"})
+	names := got[key]
+	if !slices.Equal(names, []string{"Alpha", "Beta"}) {
+		t.Fatalf("map[%q] = %v, want [Alpha Beta]", key, names)
+	}
+}
+
+func TestScanSwaggerEnumTypes_parseFailure(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "bad.go"), []byte("package fixture\nfunc Foo() {"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err := ScanSwaggerEnumTypes([]string{dir})
+	if err == nil {
+		t.Fatal("expected parse error, got nil")
+	}
+}
+
+func TestScanSwaggerEnumTypes_annotationWithoutConsts(t *testing.T) {
+	dir := t.TempDir()
+	src := `package fixture
+
+// swagger:enum Lonely
+type Lonely string
+`
+	if err := os.WriteFile(filepath.Join(dir, "lonely.go"), []byte(src), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err := ScanSwaggerEnumTypes([]string{dir})
+	if err == nil {
+		t.Fatal("expected error for annotation without consts")
+	}
+	if !strings.Contains(err.Error(), "Lonely") {
+		t.Fatalf("error %q should mention Lonely", err.Error())
+	}
+}
+
+func TestScanSwaggerEnumTypes_constsAndTypeInDifferentFiles(t *testing.T) {
+	dir := t.TempDir()
+	// Name ordering: `a_consts.go` < `b_type.go`, so readdir returns consts first.
+	// Old single-pass scanner would miss the values; two-pass must not.
+	constsSrc := `package fixture
+
+const (
+	HueA Hue = "a"
+	HueB Hue = "b"
+)
+`
+	typeSrc := `package fixture
+
+// swagger:enum Hue
+type Hue string
+`
+	if err := os.WriteFile(filepath.Join(dir, "a_consts.go"), []byte(constsSrc), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "b_type.go"), []byte(typeSrc), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := ScanSwaggerEnumTypes([]string{dir})
+	if err != nil {
+		t.Fatalf("ScanSwaggerEnumTypes: %v", err)
+	}
+	wantKey := EnumKey([]any{"a", "b"})
+	if single(got, wantKey) != "Hue" {
+		t.Fatalf("map[%q] = %q, want %q", wantKey, got[wantKey], "Hue")
+	}
+}
+
+func TestScanSwaggerEnumTypes_constsBeforeType(t *testing.T) {
+	dir := t.TempDir()
+	src := `package fixture
+
+const (
+	ShadeDark  Shade = "dark"
+	ShadeLight Shade = "light"
+)
+
+// swagger:enum Shade
+type Shade string
+`
+	if err := os.WriteFile(filepath.Join(dir, "shade.go"), []byte(src), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := ScanSwaggerEnumTypes([]string{dir})
+	if err != nil {
+		t.Fatalf("ScanSwaggerEnumTypes: %v", err)
+	}
+	wantKey := EnumKey([]any{"dark", "light"})
+	if single(got, wantKey) != "Shade" {
+		t.Fatalf("map[%q] = %q, want %q", wantKey, got[wantKey], "Shade")
+	}
+}
+
+func TestScanSwaggerEnumTypes_groupedTypeDecl(t *testing.T) {
+	dir := t.TempDir()
+	src := `package fixture
+
+type (
+	// swagger:enum Color
+	Color string
+	// swagger:enum Shade
+	Shade string
+)
+
+const (
+	ColorRed  Color = "red"
+	ColorBlue Color = "blue"
+)
+
+const (
+	ShadeDark  Shade = "dark"
+	ShadeLight Shade = "light"
+)
+`
+	if err := os.WriteFile(filepath.Join(dir, "grouped.go"), []byte(src), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := ScanSwaggerEnumTypes([]string{dir})
+	if err != nil {
+		t.Fatalf("ScanSwaggerEnumTypes: %v", err)
+	}
+	colorKey := EnumKey([]any{"red", "blue"})
+	shadeKey := EnumKey([]any{"dark", "light"})
+	if single(got, colorKey) != "Color" {
+		t.Fatalf("Color: map[%q] = %q, want %q", colorKey, got[colorKey], "Color")
+	}
+	if single(got, shadeKey) != "Shade" {
+		t.Fatalf("Shade: map[%q] = %q, want %q", shadeKey, got[shadeKey], "Shade")
+	}
+}