{"record":{"id":"a47654f442c1b18c","repo":"GoogleContainerTools/skaffold","slug":"error-matching-allowed-user-v","errorCode":null,"errorMessage":"error matching allowed user: %v","messagePattern":"error matching allowed user: (.+?)","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/skaffold/user/user.go","lineNumber":30,"sourceCode":"WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\nSee the License for the specific language governing permissions and\nlimitations under the License.\n*/\n\npackage user\n\nimport (\n\t\"fmt\"\n\t\"regexp\"\n\n\t\"github.com/GoogleContainerTools/skaffold/v2/pkg/skaffold/constants\"\n)\n\nfunc IsAllowedUser(user string) bool {\n\tfor allowedUser := range constants.AllowedUsers {\n\t\tmatched, err := regexp.MatchString(fmt.Sprintf(constants.AllowedUserPattern, allowedUser), user)\n\t\tif err != nil {\n\t\t\tpanic(fmt.Sprintf(\"error matching allowed user: %v\", err))\n\t\t}\n\n\t\tif matched {\n\t\t\treturn true\n\t\t}\n\t}\n\n\treturn false\n}\n","sourceCodeStart":12,"sourceCodeEnd":40,"githubUrl":"https://github.com/GoogleContainerTools/skaffold/blob/a1189de023efc32d4b8e11f395acc678aa555011/pkg/skaffold/user/user.go#L12-L40","documentation":"IsAllowedUser panics if regexp.MatchString fails while testing the current user against the allowed-users patterns from constants.AllowedUsers. MatchString only errors on an invalid pattern, so this panic indicates a malformed compile-time AllowedUserPattern/allowed-user entry — a developer bug, not user input.","triggerScenarios":"constants.AllowedUserPattern combined with an allowedUser entry yields an invalid regular expression (e.g. bad escaping introduced when editing the constants), causing regexp.MatchString to return err during createMetrics' user check.","commonSituations":"Editing constants.AllowedUsers or AllowedUserPattern and introducing an invalid regex; regressions after refactoring the telemetry allowlist.","solutions":["Fix the invalid regex in constants.AllowedUserPattern / AllowedUsers","Add a unit test or regexp.Compile check at init time to validate the pattern","Verify with a quick Go run that regexp.MustCompile(fmt.Sprintf(pattern, user)) compiles for each allowed user"],"exampleFix":"// before\nmatched, err := regexp.MatchString(fmt.Sprintf(constants.AllowedUserPattern, allowedUser), user)\n// after\nre := regexp.MustCompile(fmt.Sprintf(constants.AllowedUserPattern, allowedUser)) // panics at startup, not mid-request\nmatched := re.MatchString(user)","handlingStrategy":"type-guard","validationCode":"// At package init, fail fast instead of mid-request:\nvar _ = func() bool {\n  for u := range constants.AllowedUsers {\n    if _, err := regexp.Compile(fmt.Sprintf(constants.AllowedUserPattern, u)); err != nil {\n      panic(fmt.Sprintf(\"invalid allowed-user pattern for %q: %v\", u, err))\n    }\n  }\n  return true\n}()","typeGuard":"func patternIsValid(user string) (ok bool) {\n  defer func() { if recover() != nil { ok = false } }()\n  regexp.MustCompile(fmt.Sprintf(constants.AllowedUserPattern, \"x\"))\n  return true\n}","tryCatchPattern":"func isAllowedUserSafe(user string) (allowed bool) {\n  defer func() { if recover() != nil { allowed = false } }()\n  return user.IsAllowedUser(user)\n}","preventionTips":["Use regexp.MustCompile for constant patterns so bad regexes fail at startup","Add unit tests covering every entry in constants.AllowedUsers","Avoid user-controlled input being interpolated into the pattern"],"tags":["regex","panic","developer-bug","metrics"],"backgroundTag":"invalid-regex-pattern","analyzedSha":"a1189de023efc32d4b8e11f395acc678aa555011","analyzedAt":"2026-09-05T12:09:27.064Z","contentChangedAt":"2026-09-05T12:09:27.064Z","schemaVersion":2},"datasetVersion":"2026-09-12T17:17:11.597Z"}