Add support for searching users by email (#30908)

Fix #30898

we have an option `SearchByEmail`, so enable it, then we can search user
by email.
Also added a test for it.

models/user/search.go

@@ -65,7 +65,19 @@ func (opts *SearchUserOptions) toSearchQueryBase(ctx context.Context) *xorm.Sess
 			builder.Like{"LOWER(full_name)", lowerKeyword},
 		)
 		if opts.SearchByEmail {
-			keywordCond = keywordCond.Or(builder.Like{"LOWER(email)", lowerKeyword})
+			var emailCond builder.Cond
+			emailCond = builder.Like{"LOWER(email)", lowerKeyword}
+			if opts.Actor == nil {
+				emailCond = emailCond.And(builder.Eq{"keep_email_private": false})
+			} else if !opts.Actor.IsAdmin {
+				emailCond = emailCond.And(
+					builder.Or(
+						builder.Eq{"keep_email_private": false},
+						builder.Eq{"id": opts.Actor.ID},
+					),
+				)
+			}
+			keywordCond = keywordCond.Or(emailCond)
 		}
 
 		cond = cond.And(keywordCond)

routers/api/v1/user/user.go

@@ -72,6 +72,7 @@ func Search(ctx *context.APIContext) {
 			Keyword:       ctx.FormTrim("q"),
 			UID:           uid,
 			Type:          user_model.UserTypeIndividual,
+			SearchByEmail: true,
 			ListOptions:   listOptions,
 		})
 		if err != nil {

tests/integration/api_user_search_test.go

@@ -109,3 +109,39 @@ func TestAPIUserSearchNotLoggedInUserHidden(t *testing.T) {
 	DecodeJSON(t, resp, &results)
 	assert.Empty(t, results.Data)
 }
+
+func TestAPIUserSearchByEmail(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	// admin can search user with private email
+	adminUsername := "user1"
+	session := loginUser(t, adminUsername)
+	token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeReadUser)
+	query := "user2@example.com"
+	req := NewRequestf(t, "GET", "/api/v1/users/search?q=%s", query).
+		AddTokenAuth(token)
+	resp := MakeRequest(t, req, http.StatusOK)
+
+	var results SearchResults
+	DecodeJSON(t, resp, &results)
+	assert.Equal(t, 1, len(results.Data))
+	assert.Equal(t, query, results.Data[0].Email)
+
+	// no login user can not search user with private email
+	req = NewRequestf(t, "GET", "/api/v1/users/search?q=%s", query)
+	resp = MakeRequest(t, req, http.StatusOK)
+	DecodeJSON(t, resp, &results)
+	assert.Empty(t, results.Data)
+
+	// user can search self with private email
+	user2 := "user2"
+	session = loginUser(t, user2)
+	token = getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeReadUser)
+	req = NewRequestf(t, "GET", "/api/v1/users/search?q=%s", query).
+		AddTokenAuth(token)
+	resp = MakeRequest(t, req, http.StatusOK)
+
+	DecodeJSON(t, resp, &results)
+	assert.Equal(t, 1, len(results.Data))
+	assert.Equal(t, query, results.Data[0].Email)
+}