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Create specification for updating auth flow to handle MFA with garth
- Define user stories for MFA authentication support - Specify requirements for garth token management - Define success criteria for MFA implementation - Create quality checklist for specification validation
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# Specification Quality Checklist: Update Authentication Flow for MFA with garth
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**Purpose**: Validate specification completeness and quality before proceeding to planning
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**Created**: Thursday, December 19, 2025
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**Feature**: [/home/sstent/Projects/FitTrack/GarminSync/specs/007-update-the-authentication/spec.md](spec.md)
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## Content Quality
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- [x] No implementation details (languages, frameworks, APIs)
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- [x] Focused on user value and business needs
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- [x] Written for non-technical stakeholders
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- [x] All mandatory sections completed
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## Requirement Completeness
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- [x] No [NEEDS CLARIFICATION] markers remain
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- [x] Requirements are testable and unambiguous
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- [x] Success criteria are measurable
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- [x] Success criteria are technology-agnostic (no implementation details)
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- [x] All acceptance scenarios are defined
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- [x] Edge cases are identified
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- [x] Scope is clearly bounded
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- [x] Dependencies and assumptions identified
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## Feature Readiness
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- [x] All functional requirements have clear acceptance criteria
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- [x] User scenarios cover primary flows
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- [x] Feature meets measurable outcomes defined in Success Criteria
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- [x] No implementation details leak into specification
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## Notes
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- All items have been completed and validated.
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104
specs/007-update-the-authentication/spec.md
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104
specs/007-update-the-authentication/spec.md
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# Feature Specification: Update Authentication Flow for MFA with garth
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**Feature Branch**: `007-auth-flow-mfa`
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**Created**: Thursday, December 19, 2025
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**Status**: Draft
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**Input**: User description: "update the authentication flow to handle MFA with the proper calls to garth based on the conversation above"
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## User Scenarios & Testing *(mandatory)*
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### User Story 1 - Multi-Factor Authentication Support (Priority: P1)
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As a Garmin Connect user with MFA enabled, I want the CLI to properly handle the MFA authentication flow so that I can securely authenticate and access my Garmin data.
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**Why this priority**: This is critical for users who have MFA enabled on their accounts, as they currently cannot authenticate through the CLI. Without MFA support, the CLI becomes unusable for many security-conscious users.
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**Independent Test**: Can be fully tested by attempting to authenticate with an account that has MFA enabled and verifying that the system properly handles MFA challenges and completes authentication when proper MFA code is provided.
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**Acceptance Scenarios**:
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1. **Given** a user account with MFA enabled on Garmin Connect, **When** the user attempts to authenticate via CLI, **Then** the system detects the MFA requirement and prompts the user for the MFA code
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2. **Given** a user has entered credentials and received an MFA request, **When** the user provides a valid MFA code, **Then** authentication completes successfully and tokens are stored
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3. **Given** a user has entered credentials and received an MFA request, **When** the user provides an invalid MFA code, **Then** authentication fails with an appropriate error and allows retry
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4. **Given** a user has entered credentials for an account without MFA enabled, **When** the user attempts to authenticate, **Then** authentication completes directly without MFA prompts
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---
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### User Story 2 - garth Token Management Enhancement (Priority: P2)
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As an administrator of the GarminSync system, I want garth tokens to be properly stored and reused so that repeated authentications don't require re-entering credentials or MFA codes unnecessarily.
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**Why this priority**: Enhances user experience by reducing the frequency of authentication prompts and ensuring secure token handling follows best practices.
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**Independent Test**: Can be fully tested by authenticating once, then attempting a second authentication within token validity period, and verifying that the second authentication reuses existing tokens without requiring MFA input.
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**Acceptance Scenarios**:
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1. **Given** a user has successfully authenticated and tokens are stored, **When** the user authenticates again within token validity period, **Then** the system reuses existing tokens without requiring credentials
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2. **Given** a user's tokens have expired, **When** the user attempts authentication, **Then** the system performs a fresh authentication flow
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3. **Given** garth tokens need to be stored, **When** authentication completes successfully, **Then** tokens are securely stored in CentralDB with proper access controls
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---
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### User Story 3 - MFA Challenge Communication (Priority: P3)
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As a user with MFA-enabled Garmin account, I want clear communication about MFA challenges so that I understand what action I need to take during the authentication process.
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**Why this priority**: Improves user experience by providing clear guidance during authentication, reducing confusion and failed authentication attempts.
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**Independent Test**: Can be fully tested by initiating authentication and observing the clarity and helpfulness of MFA-related prompts and error messages.
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**Acceptance Scenarios**:
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1. **Given** MFA is required for an account, **When** user attempts authentication, **Then** system provides clear instruction about MFA requirement
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2. **Given** user has been prompted for MFA, **When** MFA code is needed, **Then** system indicates what type of MFA challenge (SMS, email, or push notification) has been sent
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3. **Given** MFA code has expired, **When** user enters expired code, **Then** system provides clear message and allows retry
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### Edge Cases
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- What happens when the MFA code expires while user is entering it?
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- How does the system handle network interruptions during MFA authentication?
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- What occurs if garth authentication fails due to API changes from Garmin?
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- How does the system handle multiple failed MFA attempts?
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- What happens when garth tokens become invalid and need renewal?
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## Requirements *(mandatory)*
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### Functional Requirements
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- **FR-001**: System MUST detect when MFA is required during garth authentication flow
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- **FR-002**: System MUST provide user with appropriate MFA challenge type information (push notification, SMS, email)
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- **FR-003**: User MUST be able to provide MFA code through the CLI interface
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- **FR-004**: System MUST validate MFA codes with garth and Garmin Connect services
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- **FR-005**: System MUST securely store garth OAuth1/OAuth2 tokens in CentralDB after successful authentication
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- **FR-006**: System MUST reuse existing valid garth tokens without requiring repeated authentication
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- **FR-007**: System MUST handle token expiration and refresh automatically when possible
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- **FR-008**: System MUST provide clear error messages when MFA authentication fails
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- **FR-009**: System MUST support multiple MFA methods offered by Garmin Connect (push, SMS, email)
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- **FR-010**: Authentication flow MUST be resilient to temporary network interruptions during MFA process
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### Key Entities
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- **Garth Token**: Secure authentication tokens (OAuth1 and OAuth2) used for Garmin Connect API access
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- **MFA Challenge**: Represents a multi-factor authentication request with type (push, SMS, email), expiration time, and validation status
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- **User Session**: Represents an authenticated user session with associated garth tokens and permissions
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## Success Criteria *(mandatory)*
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### Measurable Outcomes
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- **SC-001**: 100% of MFA-enabled Garmin accounts can successfully authenticate through CLI
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- **SC-002**: MFA authentication completes within 2 minutes from initial login attempt
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- **SC-003**: MFA retry mechanism allows up to 3 attempts before requiring restart of authentication flow
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- **SC-004**: garth token reuse works for 95% of subsequent authentication attempts within token validity period
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- **SC-005**: Error recovery from failed MFA attempts is clear and intuitive for 90% of users
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- **SC-006**: Token refresh mechanism successfully renews tokens automatically in 98% of cases when possible
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## Assumptions
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- garth library properly handles the MFA flow with Garmin Connect services
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- CentralDB is available and accessible for token storage
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- Garmin Connect API maintains consistent behavior for MFA challenges
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- Users have access to their MFA devices/methods during authentication
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- garth tokens follow OAuth1/OAuth2 standards for renewal and expiration
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- The garminconnect library properly integrates with garth for authentication
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